drivers/net/ethernet/ibm/ibmvnic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /**************************************************************************/
   3 /*                                                                        */
   4 /*  IBM System i and System p Virtual NIC Device Driver                   */
   5 /*  Copyright (C) 2014 IBM Corp.                                          */
   6 /*  Santiago Leon (santi_leon@yahoo.com)                                  */
   7 /*  Thomas Falcon (tlfalcon@linux.vnet.ibm.com)                           */
   8 /*  John Allen (jallen@linux.vnet.ibm.com)                                */
   9 /*                                                                        */
  10 /*                                                                        */
  11 /* This module contains the implementation of a virtual ethernet device   */
  12 /* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
  13 /* option of the RS/6000 Platform Architecture to interface with virtual  */
  14 /* ethernet NICs that are presented to the partition by the hypervisor.   */
  15 /*                                                                         */
  16 /* Messages are passed between the VNIC driver and the VNIC server using  */
  17 /* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
  18 /* issue and receive commands that initiate communication with the server */
  19 /* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
  20 /* are used by the driver to notify the server that a packet is           */
  21 /* ready for transmission or that a buffer has been added to receive a    */
  22 /* packet. Subsequently, sCRQs are used by the server to notify the       */
  23 /* driver that a packet transmission has been completed or that a packet  */
  24 /* has been received and placed in a waiting buffer.                      */
  25 /*                                                                        */
  26 /* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
  27 /* which skbs are DMA mapped and immediately unmapped when the transmit   */
  28 /* or receive has been completed, the VNIC driver is required to use      */
  29 /* "long term mapping". This entails that large, continuous DMA mapped    */
  30 /* buffers are allocated on driver initialization and these buffers are   */
  31 /* then continuously reused to pass skbs to and from the VNIC server.     */
  32 /*                                                                        */
  33 /**************************************************************************/
  34
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/types.h>
  38 #include <linux/errno.h>
  39 #include <linux/completion.h>
  40 #include <linux/ioport.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/kernel.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/etherdevice.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/init.h>
  47 #include <linux/delay.h>
  48 #include <linux/mm.h>
  49 #include <linux/ethtool.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/in.h>
  53 #include <linux/ip.h>
  54 #include <linux/ipv6.h>
  55 #include <linux/irq.h>
  56 #include <linux/kthread.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/interrupt.h>
  59 #include <net/net_namespace.h>
  60 #include <asm/hvcall.h>
  61 #include <linux/atomic.h>
  62 #include <asm/vio.h>
  63 #include <asm/iommu.h>
  64 #include <linux/uaccess.h>
  65 #include <asm/firmware.h>
  66 #include <linux/workqueue.h>
  67 #include <linux/if_vlan.h>
  68 #include <linux/utsname.h>
  69
  70 #include "ibmvnic.h"
  71
  72 static const char ibmvnic_driver_name[] = "ibmvnic";
  73 static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
  74
  75 MODULE_AUTHOR("Santiago Leon");
  76 MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
  77 MODULE_LICENSE("GPL");
  78 MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
  79
  80 static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
  81 static void release_sub_crqs(struct ibmvnic_adapter *, bool);
  82 static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
  83 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
  84 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
  85 static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
  86 static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
  87 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
  88 static int enable_scrq_irq(struct ibmvnic_adapter *,
  89                            struct ibmvnic_sub_crq_queue *);
  90 static int disable_scrq_irq(struct ibmvnic_adapter *,
  91                             struct ibmvnic_sub_crq_queue *);
  92 static int pending_scrq(struct ibmvnic_adapter *,
  93                         struct ibmvnic_sub_crq_queue *);
  94 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
  95                                         struct ibmvnic_sub_crq_queue *);
  96 static int ibmvnic_poll(struct napi_struct *napi, int data);
  97 static void send_query_map(struct ibmvnic_adapter *adapter);
  98 static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, __be32, u8);
  99 static int send_request_unmap(struct ibmvnic_adapter *, u8);
 100 static int send_login(struct ibmvnic_adapter *adapter);
 101 static void send_query_cap(struct ibmvnic_adapter *adapter);
 102 static int init_sub_crqs(struct ibmvnic_adapter *);
 103 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
 104 static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
 105 static void release_crq_queue(struct ibmvnic_adapter *);
 106 static int __ibmvnic_set_mac(struct net_device *, u8 *);
 107 static int init_crq_queue(struct ibmvnic_adapter *adapter);
 108 static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
 109
 110 struct ibmvnic_stat {
 111         char name[ETH_GSTRING_LEN];
 112         int offset;
 113 };
 114
 115 #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
 116                              offsetof(struct ibmvnic_statistics, stat))
 117 #define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
 118
 119 static const struct ibmvnic_stat ibmvnic_stats[] = {
 120         {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
 121         {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
 122         {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
 123         {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
 124         {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
 125         {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
 126         {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
 127         {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
 128         {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
 129         {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
 130         {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
 131         {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
 132         {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
 133         {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
 134         {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
 135         {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
 136         {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
 137         {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
 138         {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
 139         {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
 140         {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
 141         {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
 142 };
 143
 144 static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
 145                           unsigned long length, unsigned long *number,
 146                           unsigned long *irq)
 147 {
 148         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 149         long rc;
 150
 151         rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
 152         *number = retbuf[0];
 153         *irq = retbuf[1];
 154
 155         return rc;
 156 }
 157
 158 /**
 159  * ibmvnic_wait_for_completion - Check device state and wait for completion
 160  * @adapter: private device data
 161  * @comp_done: completion structure to wait for
 162  * @timeout: time to wait in milliseconds
 163  *
 164  * Wait for a completion signal or until the timeout limit is reached
 165  * while checking that the device is still active.
 166  */
 167 static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
 168                                        struct completion *comp_done,
 169                                        unsigned long timeout)
 170 {
 171         struct net_device *netdev;
 172         unsigned long div_timeout;
 173         u8 retry;
 174
 175         netdev = adapter->netdev;
 176         retry = 5;
 177         div_timeout = msecs_to_jiffies(timeout / retry);
 178         while (true) {
 179                 if (!adapter->crq.active) {
 180                         netdev_err(netdev, "Device down!\n");
 181                         return -ENODEV;
 182                 }
 183                 if (!retry--)
 184                         break;
 185                 if (wait_for_completion_timeout(comp_done, div_timeout))
 186                         return 0;
 187         }
 188         netdev_err(netdev, "Operation timed out.\n");
 189         return -ETIMEDOUT;
 190 }
 191
 192 static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
 193                                 struct ibmvnic_long_term_buff *ltb, int size)
 194 {
 195         struct device *dev = &adapter->vdev->dev;
 196         int rc;
 197
 198         ltb->size = size;
 199         ltb->buff = dma_alloc_coherent(dev, ltb->size, &ltb->addr,
 200                                        GFP_KERNEL);
 201
 202         if (!ltb->buff) {
 203                 dev_err(dev, "Couldn't alloc long term buffer\n");
 204                 return -ENOMEM;
 205         }
 206         ltb->map_id = adapter->map_id;
 207         adapter->map_id++;
 208
 209         mutex_lock(&adapter->fw_lock);
 210         adapter->fw_done_rc = 0;
 211         reinit_completion(&adapter->fw_done);
 212         rc = send_request_map(adapter, ltb->addr,
 213                               ltb->size, ltb->map_id);
 214         if (rc) {
 215                 dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 216                 mutex_unlock(&adapter->fw_lock);
 217                 return rc;
 218         }
 219
 220         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
 221         if (rc) {
 222                 dev_err(dev,
 223                         "Long term map request aborted or timed out,rc = %d\n",
 224                         rc);
 225                 dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 226                 mutex_unlock(&adapter->fw_lock);
 227                 return rc;
 228         }
 229
 230         if (adapter->fw_done_rc) {
 231                 dev_err(dev, "Couldn't map long term buffer,rc = %d\n",
 232                         adapter->fw_done_rc);
 233                 dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 234                 mutex_unlock(&adapter->fw_lock);
 235                 return -1;
 236         }
 237         mutex_unlock(&adapter->fw_lock);
 238         return 0;
 239 }
 240
 241 static void free_long_term_buff(struct ibmvnic_adapter *adapter,
 242                                 struct ibmvnic_long_term_buff *ltb)
 243 {
 244         struct device *dev = &adapter->vdev->dev;
 245
 246         if (!ltb->buff)
 247                 return;
 248
 249         /* VIOS automatically unmaps the long term buffer at remote
 250          * end for the following resets:
 251          * FAILOVER, MOBILITY, TIMEOUT.
 252          */
 253         if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
 254             adapter->reset_reason != VNIC_RESET_MOBILITY &&
 255             adapter->reset_reason != VNIC_RESET_TIMEOUT)
 256                 send_request_unmap(adapter, ltb->map_id);
 257         dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 258 }
 259
 260 static int reset_long_term_buff(struct ibmvnic_long_term_buff *ltb)
 261 {
 262         if (!ltb->buff)
 263                 return -EINVAL;
 264
 265         memset(ltb->buff, 0, ltb->size);
 266         return 0;
 267 }
 268
 269 static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
 270 {
 271         int i;
 272
 273         for (i = 0; i < adapter->num_active_rx_pools; i++)
 274                 adapter->rx_pool[i].active = 0;
 275 }
 276
 277 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 278                               struct ibmvnic_rx_pool *pool)
 279 {
 280         int count = pool->size - atomic_read(&pool->available);
 281         u64 handle = adapter->rx_scrq[pool->index]->handle;
 282         struct device *dev = &adapter->vdev->dev;
 283         struct ibmvnic_ind_xmit_queue *ind_bufp;
 284         struct ibmvnic_sub_crq_queue *rx_scrq;
 285         union sub_crq *sub_crq;
 286         int buffers_added = 0;
 287         unsigned long lpar_rc;
 288         struct sk_buff *skb;
 289         unsigned int offset;
 290         dma_addr_t dma_addr;
 291         unsigned char *dst;
 292         int shift = 0;
 293         int index;
 294         int i;
 295
 296         if (!pool->active)
 297                 return;
 298
 299         rx_scrq = adapter->rx_scrq[pool->index];
 300         ind_bufp = &rx_scrq->ind_buf;
 301         for (i = 0; i < count; ++i) {
 302                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 303                 if (!skb) {
 304                         dev_err(dev, "Couldn't replenish rx buff\n");
 305                         adapter->replenish_no_mem++;
 306                         break;
 307                 }
 308
 309                 index = pool->free_map[pool->next_free];
 310
 311                 if (pool->rx_buff[index].skb)
 312                         dev_err(dev, "Inconsistent free_map!\n");
 313
 314                 /* Copy the skb to the long term mapped DMA buffer */
 315                 offset = index * pool->buff_size;
 316                 dst = pool->long_term_buff.buff + offset;
 317                 memset(dst, 0, pool->buff_size);
 318                 dma_addr = pool->long_term_buff.addr + offset;
 319                 pool->rx_buff[index].data = dst;
 320
 321                 pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
 322                 pool->rx_buff[index].dma = dma_addr;
 323                 pool->rx_buff[index].skb = skb;
 324                 pool->rx_buff[index].pool_index = pool->index;
 325                 pool->rx_buff[index].size = pool->buff_size;
 326
 327                 sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
 328                 memset(sub_crq, 0, sizeof(*sub_crq));
 329                 sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
 330                 sub_crq->rx_add.correlator =
 331                     cpu_to_be64((u64)&pool->rx_buff[index]);
 332                 sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
 333                 sub_crq->rx_add.map_id = pool->long_term_buff.map_id;
 334
 335                 /* The length field of the sCRQ is defined to be 24 bits so the
 336                  * buffer size needs to be left shifted by a byte before it is
 337                  * converted to big endian to prevent the last byte from being
 338                  * truncated.
 339                  */
 340 #ifdef __LITTLE_ENDIAN__
 341                 shift = 8;
 342 #endif
 343                 sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
 344                 pool->next_free = (pool->next_free + 1) % pool->size;
 345                 if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
 346                     i == count - 1) {
 347                         lpar_rc =
 348                                 send_subcrq_indirect(adapter, handle,
 349                                                      (u64)ind_bufp->indir_dma,
 350                                                      (u64)ind_bufp->index);
 351                         if (lpar_rc != H_SUCCESS)
 352                                 goto failure;
 353                         buffers_added += ind_bufp->index;
 354                         adapter->replenish_add_buff_success += ind_bufp->index;
 355                         ind_bufp->index = 0;
 356                 }
 357         }
 358         atomic_add(buffers_added, &pool->available);
 359         return;
 360
 361 failure:
 362         if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
 363                 dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
 364         for (i = ind_bufp->index - 1; i >= 0; --i) {
 365                 struct ibmvnic_rx_buff *rx_buff;
 366
 367                 pool->next_free = pool->next_free == 0 ?
 368                                   pool->size - 1 : pool->next_free - 1;
 369                 sub_crq = &ind_bufp->indir_arr[i];
 370                 rx_buff = (struct ibmvnic_rx_buff *)
 371                                 be64_to_cpu(sub_crq->rx_add.correlator);
 372                 index = (int)(rx_buff - pool->rx_buff);
 373                 pool->free_map[pool->next_free] = index;
 374                 dev_kfree_skb_any(pool->rx_buff[index].skb);
 375                 pool->rx_buff[index].skb = NULL;
 376         }
 377         adapter->replenish_add_buff_failure += ind_bufp->index;
 378         atomic_add(buffers_added, &pool->available);
 379         ind_bufp->index = 0;
 380         if (lpar_rc == H_CLOSED || adapter->failover_pending) {
 381                 /* Disable buffer pool replenishment and report carrier off if
 382                  * queue is closed or pending failover.
 383                  * Firmware guarantees that a signal will be sent to the
 384                  * driver, triggering a reset.
 385                  */
 386                 deactivate_rx_pools(adapter);
 387                 netif_carrier_off(adapter->netdev);
 388         }
 389 }
 390
 391 static void replenish_pools(struct ibmvnic_adapter *adapter)
 392 {
 393         int i;
 394
 395         adapter->replenish_task_cycles++;
 396         for (i = 0; i < adapter->num_active_rx_pools; i++) {
 397                 if (adapter->rx_pool[i].active)
 398                         replenish_rx_pool(adapter, &adapter->rx_pool[i]);
 399         }
 400
 401         netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
 402 }
 403
 404 static void release_stats_buffers(struct ibmvnic_adapter *adapter)
 405 {
 406         kfree(adapter->tx_stats_buffers);
 407         kfree(adapter->rx_stats_buffers);
 408         adapter->tx_stats_buffers = NULL;
 409         adapter->rx_stats_buffers = NULL;
 410 }
 411
 412 static int init_stats_buffers(struct ibmvnic_adapter *adapter)
 413 {
 414         adapter->tx_stats_buffers =
 415                                 kcalloc(IBMVNIC_MAX_QUEUES,
 416                                         sizeof(struct ibmvnic_tx_queue_stats),
 417                                         GFP_KERNEL);
 418         if (!adapter->tx_stats_buffers)
 419                 return -ENOMEM;
 420
 421         adapter->rx_stats_buffers =
 422                                 kcalloc(IBMVNIC_MAX_QUEUES,
 423                                         sizeof(struct ibmvnic_rx_queue_stats),
 424                                         GFP_KERNEL);
 425         if (!adapter->rx_stats_buffers)
 426                 return -ENOMEM;
 427
 428         return 0;
 429 }
 430
 431 static void release_stats_token(struct ibmvnic_adapter *adapter)
 432 {
 433         struct device *dev = &adapter->vdev->dev;
 434
 435         if (!adapter->stats_token)
 436                 return;
 437
 438         dma_unmap_single(dev, adapter->stats_token,
 439                          sizeof(struct ibmvnic_statistics),
 440                          DMA_FROM_DEVICE);
 441         adapter->stats_token = 0;
 442 }
 443
 444 static int init_stats_token(struct ibmvnic_adapter *adapter)
 445 {
 446         struct device *dev = &adapter->vdev->dev;
 447         dma_addr_t stok;
 448
 449         stok = dma_map_single(dev, &adapter->stats,
 450                               sizeof(struct ibmvnic_statistics),
 451                               DMA_FROM_DEVICE);
 452         if (dma_mapping_error(dev, stok)) {
 453                 dev_err(dev, "Couldn't map stats buffer\n");
 454                 return -1;
 455         }
 456
 457         adapter->stats_token = stok;
 458         netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
 459         return 0;
 460 }
 461
 462 static int reset_rx_pools(struct ibmvnic_adapter *adapter)
 463 {
 464         struct ibmvnic_rx_pool *rx_pool;
 465         u64 buff_size;
 466         int rx_scrqs;
 467         int i, j, rc;
 468
 469         if (!adapter->rx_pool)
 470                 return -1;
 471
 472         buff_size = adapter->cur_rx_buf_sz;
 473         rx_scrqs = adapter->num_active_rx_pools;
 474         for (i = 0; i < rx_scrqs; i++) {
 475                 rx_pool = &adapter->rx_pool[i];
 476
 477                 netdev_dbg(adapter->netdev, "Re-setting rx_pool[%d]\n", i);
 478
 479                 if (rx_pool->buff_size != buff_size) {
 480                         free_long_term_buff(adapter, &rx_pool->long_term_buff);
 481                         rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 482                         rc = alloc_long_term_buff(adapter,
 483                                                   &rx_pool->long_term_buff,
 484                                                   rx_pool->size *
 485                                                   rx_pool->buff_size);
 486                 } else {
 487                         rc = reset_long_term_buff(&rx_pool->long_term_buff);
 488                 }
 489
 490                 if (rc)
 491                         return rc;
 492
 493                 for (j = 0; j < rx_pool->size; j++)
 494                         rx_pool->free_map[j] = j;
 495
 496                 memset(rx_pool->rx_buff, 0,
 497                        rx_pool->size * sizeof(struct ibmvnic_rx_buff));
 498
 499                 atomic_set(&rx_pool->available, 0);
 500                 rx_pool->next_alloc = 0;
 501                 rx_pool->next_free = 0;
 502                 rx_pool->active = 1;
 503         }
 504
 505         return 0;
 506 }
 507
 508 static void release_rx_pools(struct ibmvnic_adapter *adapter)
 509 {
 510         struct ibmvnic_rx_pool *rx_pool;
 511         int i, j;
 512
 513         if (!adapter->rx_pool)
 514                 return;
 515
 516         for (i = 0; i < adapter->num_active_rx_pools; i++) {
 517                 rx_pool = &adapter->rx_pool[i];
 518
 519                 netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
 520
 521                 kfree(rx_pool->free_map);
 522                 free_long_term_buff(adapter, &rx_pool->long_term_buff);
 523
 524                 if (!rx_pool->rx_buff)
 525                         continue;
 526
 527                 for (j = 0; j < rx_pool->size; j++) {
 528                         if (rx_pool->rx_buff[j].skb) {
 529                                 dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
 530                                 rx_pool->rx_buff[j].skb = NULL;
 531                         }
 532                 }
 533
 534                 kfree(rx_pool->rx_buff);
 535         }
 536
 537         kfree(adapter->rx_pool);
 538         adapter->rx_pool = NULL;
 539         adapter->num_active_rx_pools = 0;
 540 }
 541
 542 static int init_rx_pools(struct net_device *netdev)
 543 {
 544         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 545         struct device *dev = &adapter->vdev->dev;
 546         struct ibmvnic_rx_pool *rx_pool;
 547         int rxadd_subcrqs;
 548         u64 buff_size;
 549         int i, j;
 550
 551         rxadd_subcrqs = adapter->num_active_rx_scrqs;
 552         buff_size = adapter->cur_rx_buf_sz;
 553
 554         adapter->rx_pool = kcalloc(rxadd_subcrqs,
 555                                    sizeof(struct ibmvnic_rx_pool),
 556                                    GFP_KERNEL);
 557         if (!adapter->rx_pool) {
 558                 dev_err(dev, "Failed to allocate rx pools\n");
 559                 return -1;
 560         }
 561
 562         adapter->num_active_rx_pools = rxadd_subcrqs;
 563
 564         for (i = 0; i < rxadd_subcrqs; i++) {
 565                 rx_pool = &adapter->rx_pool[i];
 566
 567                 netdev_dbg(adapter->netdev,
 568                            "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
 569                            i, adapter->req_rx_add_entries_per_subcrq,
 570                            buff_size);
 571
 572                 rx_pool->size = adapter->req_rx_add_entries_per_subcrq;
 573                 rx_pool->index = i;
 574                 rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 575                 rx_pool->active = 1;
 576
 577                 rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
 578                                             GFP_KERNEL);
 579                 if (!rx_pool->free_map) {
 580                         release_rx_pools(adapter);
 581                         return -1;
 582                 }
 583
 584                 rx_pool->rx_buff = kcalloc(rx_pool->size,
 585                                            sizeof(struct ibmvnic_rx_buff),
 586                                            GFP_KERNEL);
 587                 if (!rx_pool->rx_buff) {
 588                         dev_err(dev, "Couldn't alloc rx buffers\n");
 589                         release_rx_pools(adapter);
 590                         return -1;
 591                 }
 592
 593                 if (alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
 594                                          rx_pool->size * rx_pool->buff_size)) {
 595                         release_rx_pools(adapter);
 596                         return -1;
 597                 }
 598
 599                 for (j = 0; j < rx_pool->size; ++j)
 600                         rx_pool->free_map[j] = j;
 601
 602                 atomic_set(&rx_pool->available, 0);
 603                 rx_pool->next_alloc = 0;
 604                 rx_pool->next_free = 0;
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int reset_one_tx_pool(struct ibmvnic_tx_pool *tx_pool)
 611 {
 612         int rc, i;
 613
 614         rc = reset_long_term_buff(&tx_pool->long_term_buff);
 615         if (rc)
 616                 return rc;
 617
 618         memset(tx_pool->tx_buff, 0,
 619                tx_pool->num_buffers *
 620                sizeof(struct ibmvnic_tx_buff));
 621
 622         for (i = 0; i < tx_pool->num_buffers; i++)
 623                 tx_pool->free_map[i] = i;
 624
 625         tx_pool->consumer_index = 0;
 626         tx_pool->producer_index = 0;
 627
 628         return 0;
 629 }
 630
 631 static int reset_tx_pools(struct ibmvnic_adapter *adapter)
 632 {
 633         int tx_scrqs;
 634         int i, rc;
 635
 636         if (!adapter->tx_pool)
 637                 return -1;
 638
 639         tx_scrqs = adapter->num_active_tx_pools;
 640         for (i = 0; i < tx_scrqs; i++) {
 641                 rc = reset_one_tx_pool(&adapter->tso_pool[i]);
 642                 if (rc)
 643                         return rc;
 644                 rc = reset_one_tx_pool(&adapter->tx_pool[i]);
 645                 if (rc)
 646                         return rc;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static void release_vpd_data(struct ibmvnic_adapter *adapter)
 653 {
 654         if (!adapter->vpd)
 655                 return;
 656
 657         kfree(adapter->vpd->buff);
 658         kfree(adapter->vpd);
 659
 660         adapter->vpd = NULL;
 661 }
 662
 663 static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
 664                                 struct ibmvnic_tx_pool *tx_pool)
 665 {
 666         kfree(tx_pool->tx_buff);
 667         kfree(tx_pool->free_map);
 668         free_long_term_buff(adapter, &tx_pool->long_term_buff);
 669 }
 670
 671 static void release_tx_pools(struct ibmvnic_adapter *adapter)
 672 {
 673         int i;
 674
 675         if (!adapter->tx_pool)
 676                 return;
 677
 678         for (i = 0; i < adapter->num_active_tx_pools; i++) {
 679                 release_one_tx_pool(adapter, &adapter->tx_pool[i]);
 680                 release_one_tx_pool(adapter, &adapter->tso_pool[i]);
 681         }
 682
 683         kfree(adapter->tx_pool);
 684         adapter->tx_pool = NULL;
 685         kfree(adapter->tso_pool);
 686         adapter->tso_pool = NULL;
 687         adapter->num_active_tx_pools = 0;
 688 }
 689
 690 static int init_one_tx_pool(struct net_device *netdev,
 691                             struct ibmvnic_tx_pool *tx_pool,
 692                             int num_entries, int buf_size)
 693 {
 694         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 695         int i;
 696
 697         tx_pool->tx_buff = kcalloc(num_entries,
 698                                    sizeof(struct ibmvnic_tx_buff),
 699                                    GFP_KERNEL);
 700         if (!tx_pool->tx_buff)
 701                 return -1;
 702
 703         if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
 704                                  num_entries * buf_size))
 705                 return -1;
 706
 707         tx_pool->free_map = kcalloc(num_entries, sizeof(int), GFP_KERNEL);
 708         if (!tx_pool->free_map)
 709                 return -1;
 710
 711         for (i = 0; i < num_entries; i++)
 712                 tx_pool->free_map[i] = i;
 713
 714         tx_pool->consumer_index = 0;
 715         tx_pool->producer_index = 0;
 716         tx_pool->num_buffers = num_entries;
 717         tx_pool->buf_size = buf_size;
 718
 719         return 0;
 720 }
 721
 722 static int init_tx_pools(struct net_device *netdev)
 723 {
 724         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 725         int tx_subcrqs;
 726         u64 buff_size;
 727         int i, rc;
 728
 729         tx_subcrqs = adapter->num_active_tx_scrqs;
 730         adapter->tx_pool = kcalloc(tx_subcrqs,
 731                                    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
 732         if (!adapter->tx_pool)
 733                 return -1;
 734
 735         adapter->tso_pool = kcalloc(tx_subcrqs,
 736                                     sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
 737         if (!adapter->tso_pool)
 738                 return -1;
 739
 740         adapter->num_active_tx_pools = tx_subcrqs;
 741
 742         for (i = 0; i < tx_subcrqs; i++) {
 743                 buff_size = adapter->req_mtu + VLAN_HLEN;
 744                 buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 745                 rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
 746                                       adapter->req_tx_entries_per_subcrq,
 747                                       buff_size);
 748                 if (rc) {
 749                         release_tx_pools(adapter);
 750                         return rc;
 751                 }
 752
 753                 rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
 754                                       IBMVNIC_TSO_BUFS,
 755                                       IBMVNIC_TSO_BUF_SZ);
 756                 if (rc) {
 757                         release_tx_pools(adapter);
 758                         return rc;
 759                 }
 760         }
 761
 762         return 0;
 763 }
 764
 765 static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
 766 {
 767         int i;
 768
 769         if (adapter->napi_enabled)
 770                 return;
 771
 772         for (i = 0; i < adapter->req_rx_queues; i++)
 773                 napi_enable(&adapter->napi[i]);
 774
 775         adapter->napi_enabled = true;
 776 }
 777
 778 static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
 779 {
 780         int i;
 781
 782         if (!adapter->napi_enabled)
 783                 return;
 784
 785         for (i = 0; i < adapter->req_rx_queues; i++) {
 786                 netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
 787                 napi_disable(&adapter->napi[i]);
 788         }
 789
 790         adapter->napi_enabled = false;
 791 }
 792
 793 static int init_napi(struct ibmvnic_adapter *adapter)
 794 {
 795         int i;
 796
 797         adapter->napi = kcalloc(adapter->req_rx_queues,
 798                                 sizeof(struct napi_struct), GFP_KERNEL);
 799         if (!adapter->napi)
 800                 return -ENOMEM;
 801
 802         for (i = 0; i < adapter->req_rx_queues; i++) {
 803                 netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
 804                 netif_napi_add(adapter->netdev, &adapter->napi[i],
 805                                ibmvnic_poll, NAPI_POLL_WEIGHT);
 806         }
 807
 808         adapter->num_active_rx_napi = adapter->req_rx_queues;
 809         return 0;
 810 }
 811
 812 static void release_napi(struct ibmvnic_adapter *adapter)
 813 {
 814         int i;
 815
 816         if (!adapter->napi)
 817                 return;
 818
 819         for (i = 0; i < adapter->num_active_rx_napi; i++) {
 820                 netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
 821                 netif_napi_del(&adapter->napi[i]);
 822         }
 823
 824         kfree(adapter->napi);
 825         adapter->napi = NULL;
 826         adapter->num_active_rx_napi = 0;
 827         adapter->napi_enabled = false;
 828 }
 829
 830 static const char *adapter_state_to_string(enum vnic_state state)
 831 {
 832         switch (state) {
 833         case VNIC_PROBING:
 834                 return "PROBING";
 835         case VNIC_PROBED:
 836                 return "PROBED";
 837         case VNIC_OPENING:
 838                 return "OPENING";
 839         case VNIC_OPEN:
 840                 return "OPEN";
 841         case VNIC_CLOSING:
 842                 return "CLOSING";
 843         case VNIC_CLOSED:
 844                 return "CLOSED";
 845         case VNIC_REMOVING:
 846                 return "REMOVING";
 847         case VNIC_REMOVED:
 848                 return "REMOVED";
 849         default:
 850                 return "UNKNOWN";
 851         }
 852 }
 853
 854 static int ibmvnic_login(struct net_device *netdev)
 855 {
 856         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 857         unsigned long timeout = msecs_to_jiffies(20000);
 858         int retry_count = 0;
 859         int retries = 10;
 860         bool retry;
 861         int rc;
 862
 863         do {
 864                 retry = false;
 865                 if (retry_count > retries) {
 866                         netdev_warn(netdev, "Login attempts exceeded\n");
 867                         return -1;
 868                 }
 869
 870                 adapter->init_done_rc = 0;
 871                 reinit_completion(&adapter->init_done);
 872                 rc = send_login(adapter);
 873                 if (rc)
 874                         return rc;
 875
 876                 if (!wait_for_completion_timeout(&adapter->init_done,
 877                                                  timeout)) {
 878                         netdev_warn(netdev, "Login timed out, retrying...\n");
 879                         retry = true;
 880                         adapter->init_done_rc = 0;
 881                         retry_count++;
 882                         continue;
 883                 }
 884
 885                 if (adapter->init_done_rc == ABORTED) {
 886                         netdev_warn(netdev, "Login aborted, retrying...\n");
 887                         retry = true;
 888                         adapter->init_done_rc = 0;
 889                         retry_count++;
 890                         /* FW or device may be busy, so
 891                          * wait a bit before retrying login
 892                          */
 893                         msleep(500);
 894                 } else if (adapter->init_done_rc == PARTIALSUCCESS) {
 895                         retry_count++;
 896                         release_sub_crqs(adapter, 1);
 897
 898                         retry = true;
 899                         netdev_dbg(netdev,
 900                                    "Received partial success, retrying...\n");
 901                         adapter->init_done_rc = 0;
 902                         reinit_completion(&adapter->init_done);
 903                         send_query_cap(adapter);
 904                         if (!wait_for_completion_timeout(&adapter->init_done,
 905                                                          timeout)) {
 906                                 netdev_warn(netdev,
 907                                             "Capabilities query timed out\n");
 908                                 return -1;
 909                         }
 910
 911                         rc = init_sub_crqs(adapter);
 912                         if (rc) {
 913                                 netdev_warn(netdev,
 914                                             "SCRQ initialization failed\n");
 915                                 return -1;
 916                         }
 917
 918                         rc = init_sub_crq_irqs(adapter);
 919                         if (rc) {
 920                                 netdev_warn(netdev,
 921                                             "SCRQ irq initialization failed\n");
 922                                 return -1;
 923                         }
 924                 } else if (adapter->init_done_rc) {
 925                         netdev_warn(netdev, "Adapter login failed\n");
 926                         return -1;
 927                 }
 928         } while (retry);
 929
 930         __ibmvnic_set_mac(netdev, adapter->mac_addr);
 931
 932         netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
 933         return 0;
 934 }
 935
 936 static void release_login_buffer(struct ibmvnic_adapter *adapter)
 937 {
 938         kfree(adapter->login_buf);
 939         adapter->login_buf = NULL;
 940 }
 941
 942 static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
 943 {
 944         kfree(adapter->login_rsp_buf);
 945         adapter->login_rsp_buf = NULL;
 946 }
 947
 948 static void release_resources(struct ibmvnic_adapter *adapter)
 949 {
 950         release_vpd_data(adapter);
 951
 952         release_tx_pools(adapter);
 953         release_rx_pools(adapter);
 954
 955         release_napi(adapter);
 956         release_login_buffer(adapter);
 957         release_login_rsp_buffer(adapter);
 958 }
 959
 960 static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
 961 {
 962         struct net_device *netdev = adapter->netdev;
 963         unsigned long timeout = msecs_to_jiffies(20000);
 964         union ibmvnic_crq crq;
 965         bool resend;
 966         int rc;
 967
 968         netdev_dbg(netdev, "setting link state %d\n", link_state);
 969
 970         memset(&crq, 0, sizeof(crq));
 971         crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
 972         crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
 973         crq.logical_link_state.link_state = link_state;
 974
 975         do {
 976                 resend = false;
 977
 978                 reinit_completion(&adapter->init_done);
 979                 rc = ibmvnic_send_crq(adapter, &crq);
 980                 if (rc) {
 981                         netdev_err(netdev, "Failed to set link state\n");
 982                         return rc;
 983                 }
 984
 985                 if (!wait_for_completion_timeout(&adapter->init_done,
 986                                                  timeout)) {
 987                         netdev_err(netdev, "timeout setting link state\n");
 988                         return -1;
 989                 }
 990
 991                 if (adapter->init_done_rc == PARTIALSUCCESS) {
 992                         /* Partuial success, delay and re-send */
 993                         mdelay(1000);
 994                         resend = true;
 995                 } else if (adapter->init_done_rc) {
 996                         netdev_warn(netdev, "Unable to set link state, rc=%d\n",
 997                                     adapter->init_done_rc);
 998                         return adapter->init_done_rc;
 999                 }
1000         } while (resend);
1001
1002         return 0;
1003 }
1004
1005 static int set_real_num_queues(struct net_device *netdev)
1006 {
1007         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1008         int rc;
1009
1010         netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
1011                    adapter->req_tx_queues, adapter->req_rx_queues);
1012
1013         rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
1014         if (rc) {
1015                 netdev_err(netdev, "failed to set the number of tx queues\n");
1016                 return rc;
1017         }
1018
1019         rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
1020         if (rc)
1021                 netdev_err(netdev, "failed to set the number of rx queues\n");
1022
1023         return rc;
1024 }
1025
1026 static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
1027 {
1028         struct device *dev = &adapter->vdev->dev;
1029         union ibmvnic_crq crq;
1030         int len = 0;
1031         int rc;
1032
1033         if (adapter->vpd->buff)
1034                 len = adapter->vpd->len;
1035
1036         mutex_lock(&adapter->fw_lock);
1037         adapter->fw_done_rc = 0;
1038         reinit_completion(&adapter->fw_done);
1039
1040         crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
1041         crq.get_vpd_size.cmd = GET_VPD_SIZE;
1042         rc = ibmvnic_send_crq(adapter, &crq);
1043         if (rc) {
1044                 mutex_unlock(&adapter->fw_lock);
1045                 return rc;
1046         }
1047
1048         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1049         if (rc) {
1050                 dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
1051                 mutex_unlock(&adapter->fw_lock);
1052                 return rc;
1053         }
1054         mutex_unlock(&adapter->fw_lock);
1055
1056         if (!adapter->vpd->len)
1057                 return -ENODATA;
1058
1059         if (!adapter->vpd->buff)
1060                 adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
1061         else if (adapter->vpd->len != len)
1062                 adapter->vpd->buff =
1063                         krealloc(adapter->vpd->buff,
1064                                  adapter->vpd->len, GFP_KERNEL);
1065
1066         if (!adapter->vpd->buff) {
1067                 dev_err(dev, "Could allocate VPD buffer\n");
1068                 return -ENOMEM;
1069         }
1070
1071         adapter->vpd->dma_addr =
1072                 dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
1073                                DMA_FROM_DEVICE);
1074         if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
1075                 dev_err(dev, "Could not map VPD buffer\n");
1076                 kfree(adapter->vpd->buff);
1077                 adapter->vpd->buff = NULL;
1078                 return -ENOMEM;
1079         }
1080
1081         mutex_lock(&adapter->fw_lock);
1082         adapter->fw_done_rc = 0;
1083         reinit_completion(&adapter->fw_done);
1084
1085         crq.get_vpd.first = IBMVNIC_CRQ_CMD;
1086         crq.get_vpd.cmd = GET_VPD;
1087         crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
1088         crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
1089         rc = ibmvnic_send_crq(adapter, &crq);
1090         if (rc) {
1091                 kfree(adapter->vpd->buff);
1092                 adapter->vpd->buff = NULL;
1093                 mutex_unlock(&adapter->fw_lock);
1094                 return rc;
1095         }
1096
1097         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1098         if (rc) {
1099                 dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
1100                 kfree(adapter->vpd->buff);
1101                 adapter->vpd->buff = NULL;
1102                 mutex_unlock(&adapter->fw_lock);
1103                 return rc;
1104         }
1105
1106         mutex_unlock(&adapter->fw_lock);
1107         return 0;
1108 }
1109
1110 static int init_resources(struct ibmvnic_adapter *adapter)
1111 {
1112         struct net_device *netdev = adapter->netdev;
1113         int rc;
1114
1115         rc = set_real_num_queues(netdev);
1116         if (rc)
1117                 return rc;
1118
1119         adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
1120         if (!adapter->vpd)
1121                 return -ENOMEM;
1122
1123         /* Vital Product Data (VPD) */
1124         rc = ibmvnic_get_vpd(adapter);
1125         if (rc) {
1126                 netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
1127                 return rc;
1128         }
1129
1130         adapter->map_id = 1;
1131
1132         rc = init_napi(adapter);
1133         if (rc)
1134                 return rc;
1135
1136         send_query_map(adapter);
1137
1138         rc = init_rx_pools(netdev);
1139         if (rc)
1140                 return rc;
1141
1142         rc = init_tx_pools(netdev);
1143         return rc;
1144 }
1145
1146 static int __ibmvnic_open(struct net_device *netdev)
1147 {
1148         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1149         enum vnic_state prev_state = adapter->state;
1150         int i, rc;
1151
1152         adapter->state = VNIC_OPENING;
1153         replenish_pools(adapter);
1154         ibmvnic_napi_enable(adapter);
1155
1156         /* We're ready to receive frames, enable the sub-crq interrupts and
1157          * set the logical link state to up
1158          */
1159         for (i = 0; i < adapter->req_rx_queues; i++) {
1160                 netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
1161                 if (prev_state == VNIC_CLOSED)
1162                         enable_irq(adapter->rx_scrq[i]->irq);
1163                 enable_scrq_irq(adapter, adapter->rx_scrq[i]);
1164         }
1165
1166         for (i = 0; i < adapter->req_tx_queues; i++) {
1167                 netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
1168                 if (prev_state == VNIC_CLOSED)
1169                         enable_irq(adapter->tx_scrq[i]->irq);
1170                 enable_scrq_irq(adapter, adapter->tx_scrq[i]);
1171                 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
1172         }
1173
1174         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
1175         if (rc) {
1176                 ibmvnic_napi_disable(adapter);
1177                 release_resources(adapter);
1178                 return rc;
1179         }
1180
1181         netif_tx_start_all_queues(netdev);
1182
1183         adapter->state = VNIC_OPEN;
1184         return rc;
1185 }
1186
1187 static int ibmvnic_open(struct net_device *netdev)
1188 {
1189         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1190         int rc;
1191
1192         ASSERT_RTNL();
1193
1194         /* If device failover is pending or we are about to reset, just set
1195          * device state and return. Device operation will be handled by reset
1196          * routine.
1197          *
1198          * It should be safe to overwrite the adapter->state here. Since
1199          * we hold the rtnl, either the reset has not actually started or
1200          * the rtnl got dropped during the set_link_state() in do_reset().
1201          * In the former case, no one else is changing the state (again we
1202          * have the rtnl) and in the latter case, do_reset() will detect and
1203          * honor our setting below.
1204          */
1205         if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
1206                 netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
1207                            adapter_state_to_string(adapter->state),
1208                            adapter->failover_pending);
1209                 adapter->state = VNIC_OPEN;
1210                 rc = 0;
1211                 goto out;
1212         }
1213
1214         if (adapter->state != VNIC_CLOSED) {
1215                 rc = ibmvnic_login(netdev);
1216                 if (rc)
1217                         goto out;
1218
1219                 rc = init_resources(adapter);
1220                 if (rc) {
1221                         netdev_err(netdev, "failed to initialize resources\n");
1222                         release_resources(adapter);
1223                         goto out;
1224                 }
1225         }
1226
1227         rc = __ibmvnic_open(netdev);
1228
1229 out:
1230         /* If open failed and there is a pending failover or in-progress reset,
1231          * set device state and return. Device operation will be handled by
1232          * reset routine. See also comments above regarding rtnl.
1233          */
1234         if (rc &&
1235             (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
1236                 adapter->state = VNIC_OPEN;
1237                 rc = 0;
1238         }
1239         return rc;
1240 }
1241
1242 static void clean_rx_pools(struct ibmvnic_adapter *adapter)
1243 {
1244         struct ibmvnic_rx_pool *rx_pool;
1245         struct ibmvnic_rx_buff *rx_buff;
1246         u64 rx_entries;
1247         int rx_scrqs;
1248         int i, j;
1249
1250         if (!adapter->rx_pool)
1251                 return;
1252
1253         rx_scrqs = adapter->num_active_rx_pools;
1254         rx_entries = adapter->req_rx_add_entries_per_subcrq;
1255
1256         /* Free any remaining skbs in the rx buffer pools */
1257         for (i = 0; i < rx_scrqs; i++) {
1258                 rx_pool = &adapter->rx_pool[i];
1259                 if (!rx_pool || !rx_pool->rx_buff)
1260                         continue;
1261
1262                 netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
1263                 for (j = 0; j < rx_entries; j++) {
1264                         rx_buff = &rx_pool->rx_buff[j];
1265                         if (rx_buff && rx_buff->skb) {
1266                                 dev_kfree_skb_any(rx_buff->skb);
1267                                 rx_buff->skb = NULL;
1268                         }
1269                 }
1270         }
1271 }
1272
1273 static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
1274                               struct ibmvnic_tx_pool *tx_pool)
1275 {
1276         struct ibmvnic_tx_buff *tx_buff;
1277         u64 tx_entries;
1278         int i;
1279
1280         if (!tx_pool || !tx_pool->tx_buff)
1281                 return;
1282
1283         tx_entries = tx_pool->num_buffers;
1284
1285         for (i = 0; i < tx_entries; i++) {
1286                 tx_buff = &tx_pool->tx_buff[i];
1287                 if (tx_buff && tx_buff->skb) {
1288                         dev_kfree_skb_any(tx_buff->skb);
1289                         tx_buff->skb = NULL;
1290                 }
1291         }
1292 }
1293
1294 static void clean_tx_pools(struct ibmvnic_adapter *adapter)
1295 {
1296         int tx_scrqs;
1297         int i;
1298
1299         if (!adapter->tx_pool || !adapter->tso_pool)
1300                 return;
1301
1302         tx_scrqs = adapter->num_active_tx_pools;
1303
1304         /* Free any remaining skbs in the tx buffer pools */
1305         for (i = 0; i < tx_scrqs; i++) {
1306                 netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
1307                 clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
1308                 clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
1309         }
1310 }
1311
1312 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
1313 {
1314         struct net_device *netdev = adapter->netdev;
1315         int i;
1316
1317         if (adapter->tx_scrq) {
1318                 for (i = 0; i < adapter->req_tx_queues; i++)
1319                         if (adapter->tx_scrq[i]->irq) {
1320                                 netdev_dbg(netdev,
1321                                            "Disabling tx_scrq[%d] irq\n", i);
1322                                 disable_scrq_irq(adapter, adapter->tx_scrq[i]);
1323                                 disable_irq(adapter->tx_scrq[i]->irq);
1324                         }
1325         }
1326
1327         if (adapter->rx_scrq) {
1328                 for (i = 0; i < adapter->req_rx_queues; i++) {
1329                         if (adapter->rx_scrq[i]->irq) {
1330                                 netdev_dbg(netdev,
1331                                            "Disabling rx_scrq[%d] irq\n", i);
1332                                 disable_scrq_irq(adapter, adapter->rx_scrq[i]);
1333                                 disable_irq(adapter->rx_scrq[i]->irq);
1334                         }
1335                 }
1336         }
1337 }
1338
1339 static void ibmvnic_cleanup(struct net_device *netdev)
1340 {
1341         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1342
1343         /* ensure that transmissions are stopped if called by do_reset */
1344         if (test_bit(0, &adapter->resetting))
1345                 netif_tx_disable(netdev);
1346         else
1347                 netif_tx_stop_all_queues(netdev);
1348
1349         ibmvnic_napi_disable(adapter);
1350         ibmvnic_disable_irqs(adapter);
1351
1352         clean_rx_pools(adapter);
1353         clean_tx_pools(adapter);
1354 }
1355
1356 static int __ibmvnic_close(struct net_device *netdev)
1357 {
1358         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1359         int rc = 0;
1360
1361         adapter->state = VNIC_CLOSING;
1362         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
1363         adapter->state = VNIC_CLOSED;
1364         return rc;
1365 }
1366
1367 static int ibmvnic_close(struct net_device *netdev)
1368 {
1369         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1370         int rc;
1371
1372         netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
1373                    adapter_state_to_string(adapter->state),
1374                    adapter->failover_pending,
1375                    adapter->force_reset_recovery);
1376
1377         /* If device failover is pending, just set device state and return.
1378          * Device operation will be handled by reset routine.
1379          */
1380         if (adapter->failover_pending) {
1381                 adapter->state = VNIC_CLOSED;
1382                 return 0;
1383         }
1384
1385         rc = __ibmvnic_close(netdev);
1386         ibmvnic_cleanup(netdev);
1387
1388         return rc;
1389 }
1390
1391 /**
1392  * build_hdr_data - creates L2/L3/L4 header data buffer
1393  * @hdr_field: bitfield determining needed headers
1394  * @skb: socket buffer
1395  * @hdr_len: array of header lengths
1396  * @hdr_data: buffer to write the header to
1397  *
1398  * Reads hdr_field to determine which headers are needed by firmware.
1399  * Builds a buffer containing these headers.  Saves individual header
1400  * lengths and total buffer length to be used to build descriptors.
1401  */
1402 static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
1403                           int *hdr_len, u8 *hdr_data)
1404 {
1405         int len = 0;
1406         u8 *hdr;
1407
1408         if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
1409                 hdr_len[0] = sizeof(struct vlan_ethhdr);
1410         else
1411                 hdr_len[0] = sizeof(struct ethhdr);
1412
1413         if (skb->protocol == htons(ETH_P_IP)) {
1414                 hdr_len[1] = ip_hdr(skb)->ihl * 4;
1415                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
1416                         hdr_len[2] = tcp_hdrlen(skb);
1417                 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
1418                         hdr_len[2] = sizeof(struct udphdr);
1419         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1420                 hdr_len[1] = sizeof(struct ipv6hdr);
1421                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
1422                         hdr_len[2] = tcp_hdrlen(skb);
1423                 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
1424                         hdr_len[2] = sizeof(struct udphdr);
1425         } else if (skb->protocol == htons(ETH_P_ARP)) {
1426                 hdr_len[1] = arp_hdr_len(skb->dev);
1427                 hdr_len[2] = 0;
1428         }
1429
1430         memset(hdr_data, 0, 120);
1431         if ((hdr_field >> 6) & 1) {
1432                 hdr = skb_mac_header(skb);
1433                 memcpy(hdr_data, hdr, hdr_len[0]);
1434                 len += hdr_len[0];
1435         }
1436
1437         if ((hdr_field >> 5) & 1) {
1438                 hdr = skb_network_header(skb);
1439                 memcpy(hdr_data + len, hdr, hdr_len[1]);
1440                 len += hdr_len[1];
1441         }
1442
1443         if ((hdr_field >> 4) & 1) {
1444                 hdr = skb_transport_header(skb);
1445                 memcpy(hdr_data + len, hdr, hdr_len[2]);
1446                 len += hdr_len[2];
1447         }
1448         return len;
1449 }
1450
1451 /**
1452  * create_hdr_descs - create header and header extension descriptors
1453  * @hdr_field: bitfield determining needed headers
1454  * @hdr_data: buffer containing header data
1455  * @len: length of data buffer
1456  * @hdr_len: array of individual header lengths
1457  * @scrq_arr: descriptor array
1458  *
1459  * Creates header and, if needed, header extension descriptors and
1460  * places them in a descriptor array, scrq_arr
1461  */
1462
1463 static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
1464                             union sub_crq *scrq_arr)
1465 {
1466         union sub_crq hdr_desc;
1467         int tmp_len = len;
1468         int num_descs = 0;
1469         u8 *data, *cur;
1470         int tmp;
1471
1472         while (tmp_len > 0) {
1473                 cur = hdr_data + len - tmp_len;
1474
1475                 memset(&hdr_desc, 0, sizeof(hdr_desc));
1476                 if (cur != hdr_data) {
1477                         data = hdr_desc.hdr_ext.data;
1478                         tmp = tmp_len > 29 ? 29 : tmp_len;
1479                         hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
1480                         hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
1481                         hdr_desc.hdr_ext.len = tmp;
1482                 } else {
1483                         data = hdr_desc.hdr.data;
1484                         tmp = tmp_len > 24 ? 24 : tmp_len;
1485                         hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
1486                         hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
1487                         hdr_desc.hdr.len = tmp;
1488                         hdr_desc.hdr.l2_len = (u8)hdr_len[0];
1489                         hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
1490                         hdr_desc.hdr.l4_len = (u8)hdr_len[2];
1491                         hdr_desc.hdr.flag = hdr_field << 1;
1492                 }
1493                 memcpy(data, cur, tmp);
1494                 tmp_len -= tmp;
1495                 *scrq_arr = hdr_desc;
1496                 scrq_arr++;
1497                 num_descs++;
1498         }
1499
1500         return num_descs;
1501 }
1502
1503 /**
1504  * build_hdr_descs_arr - build a header descriptor array
1505  * @txbuff: tx buffer
1506  * @num_entries: number of descriptors to be sent
1507  * @hdr_field: bit field determining which headers will be sent
1508  *
1509  * This function will build a TX descriptor array with applicable
1510  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
1511  */
1512
1513 static void build_hdr_descs_arr(struct sk_buff *skb,
1514                                 union sub_crq *indir_arr,
1515                                 int *num_entries, u8 hdr_field)
1516 {
1517         int hdr_len[3] = {0, 0, 0};
1518         u8 hdr_data[140] = {0};
1519         int tot_len;
1520
1521         tot_len = build_hdr_data(hdr_field, skb, hdr_len,
1522                                  hdr_data);
1523         *num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
1524                                          indir_arr + 1);
1525 }
1526
1527 static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
1528                                     struct net_device *netdev)
1529 {
1530         /* For some backing devices, mishandling of small packets
1531          * can result in a loss of connection or TX stall. Device
1532          * architects recommend that no packet should be smaller
1533          * than the minimum MTU value provided to the driver, so
1534          * pad any packets to that length
1535          */
1536         if (skb->len < netdev->min_mtu)
1537                 return skb_put_padto(skb, netdev->min_mtu);
1538
1539         return 0;
1540 }
1541
1542 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
1543                                          struct ibmvnic_sub_crq_queue *tx_scrq)
1544 {
1545         struct ibmvnic_ind_xmit_queue *ind_bufp;
1546         struct ibmvnic_tx_buff *tx_buff;
1547         struct ibmvnic_tx_pool *tx_pool;
1548         union sub_crq tx_scrq_entry;
1549         int queue_num;
1550         int entries;
1551         int index;
1552         int i;
1553
1554         ind_bufp = &tx_scrq->ind_buf;
1555         entries = (u64)ind_bufp->index;
1556         queue_num = tx_scrq->pool_index;
1557
1558         for (i = entries - 1; i >= 0; --i) {
1559                 tx_scrq_entry = ind_bufp->indir_arr[i];
1560                 if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
1561                         continue;
1562                 index = be32_to_cpu(tx_scrq_entry.v1.correlator);
1563                 if (index & IBMVNIC_TSO_POOL_MASK) {
1564                         tx_pool = &adapter->tso_pool[queue_num];
1565                         index &= ~IBMVNIC_TSO_POOL_MASK;
1566                 } else {
1567                         tx_pool = &adapter->tx_pool[queue_num];
1568                 }
1569                 tx_pool->free_map[tx_pool->consumer_index] = index;
1570                 tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
1571                                           tx_pool->num_buffers - 1 :
1572                                           tx_pool->consumer_index - 1;
1573                 tx_buff = &tx_pool->tx_buff[index];
1574                 adapter->netdev->stats.tx_packets--;
1575                 adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
1576                 adapter->tx_stats_buffers[queue_num].packets--;
1577                 adapter->tx_stats_buffers[queue_num].bytes -=
1578                                                 tx_buff->skb->len;
1579                 dev_kfree_skb_any(tx_buff->skb);
1580                 tx_buff->skb = NULL;
1581                 adapter->netdev->stats.tx_dropped++;
1582         }
1583         ind_bufp->index = 0;
1584         if (atomic_sub_return(entries, &tx_scrq->used) <=
1585             (adapter->req_tx_entries_per_subcrq / 2) &&
1586             __netif_subqueue_stopped(adapter->netdev, queue_num)) {
1587                 netif_wake_subqueue(adapter->netdev, queue_num);
1588                 netdev_dbg(adapter->netdev, "Started queue %d\n",
1589                            queue_num);
1590         }
1591 }
1592
1593 static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
1594                                  struct ibmvnic_sub_crq_queue *tx_scrq)
1595 {
1596         struct ibmvnic_ind_xmit_queue *ind_bufp;
1597         u64 dma_addr;
1598         u64 entries;
1599         u64 handle;
1600         int rc;
1601
1602         ind_bufp = &tx_scrq->ind_buf;
1603         dma_addr = (u64)ind_bufp->indir_dma;
1604         entries = (u64)ind_bufp->index;
1605         handle = tx_scrq->handle;
1606
1607         if (!entries)
1608                 return 0;
1609         rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
1610         if (rc)
1611                 ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
1612         else
1613                 ind_bufp->index = 0;
1614         return 0;
1615 }
1616
1617 static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
1618 {
1619         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1620         int queue_num = skb_get_queue_mapping(skb);
1621         u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
1622         struct device *dev = &adapter->vdev->dev;
1623         struct ibmvnic_ind_xmit_queue *ind_bufp;
1624         struct ibmvnic_tx_buff *tx_buff = NULL;
1625         struct ibmvnic_sub_crq_queue *tx_scrq;
1626         struct ibmvnic_tx_pool *tx_pool;
1627         unsigned int tx_send_failed = 0;
1628         netdev_tx_t ret = NETDEV_TX_OK;
1629         unsigned int tx_map_failed = 0;
1630         union sub_crq indir_arr[16];
1631         unsigned int tx_dropped = 0;
1632         unsigned int tx_packets = 0;
1633         unsigned int tx_bytes = 0;
1634         dma_addr_t data_dma_addr;
1635         struct netdev_queue *txq;
1636         unsigned long lpar_rc;
1637         union sub_crq tx_crq;
1638         unsigned int offset;
1639         int num_entries = 1;
1640         unsigned char *dst;
1641         int index = 0;
1642         u8 proto = 0;
1643
1644         tx_scrq = adapter->tx_scrq[queue_num];
1645         txq = netdev_get_tx_queue(netdev, queue_num);
1646         ind_bufp = &tx_scrq->ind_buf;
1647
1648         if (test_bit(0, &adapter->resetting)) {
1649                 if (!netif_subqueue_stopped(netdev, skb))
1650                         netif_stop_subqueue(netdev, queue_num);
1651                 dev_kfree_skb_any(skb);
1652
1653                 tx_send_failed++;
1654                 tx_dropped++;
1655                 ret = NETDEV_TX_OK;
1656                 ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1657                 goto out;
1658         }
1659
1660         if (ibmvnic_xmit_workarounds(skb, netdev)) {
1661                 tx_dropped++;
1662                 tx_send_failed++;
1663                 ret = NETDEV_TX_OK;
1664                 ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1665                 goto out;
1666         }
1667         if (skb_is_gso(skb))
1668                 tx_pool = &adapter->tso_pool[queue_num];
1669         else
1670                 tx_pool = &adapter->tx_pool[queue_num];
1671
1672         index = tx_pool->free_map[tx_pool->consumer_index];
1673
1674         if (index == IBMVNIC_INVALID_MAP) {
1675                 dev_kfree_skb_any(skb);
1676                 tx_send_failed++;
1677                 tx_dropped++;
1678                 ret = NETDEV_TX_OK;
1679                 ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1680                 goto out;
1681         }
1682
1683         tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
1684
1685         offset = index * tx_pool->buf_size;
1686         dst = tx_pool->long_term_buff.buff + offset;
1687         memset(dst, 0, tx_pool->buf_size);
1688         data_dma_addr = tx_pool->long_term_buff.addr + offset;
1689
1690         if (skb_shinfo(skb)->nr_frags) {
1691                 int cur, i;
1692
1693                 /* Copy the head */
1694                 skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
1695                 cur = skb_headlen(skb);
1696
1697                 /* Copy the frags */
1698                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1699                         const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1700
1701                         memcpy(dst + cur, skb_frag_address(frag),
1702                                skb_frag_size(frag));
1703                         cur += skb_frag_size(frag);
1704                 }
1705         } else {
1706                 skb_copy_from_linear_data(skb, dst, skb->len);
1707         }
1708
1709         /* post changes to long_term_buff *dst before VIOS accessing it */
1710         dma_wmb();
1711
1712         tx_pool->consumer_index =
1713             (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
1714
1715         tx_buff = &tx_pool->tx_buff[index];
1716         tx_buff->skb = skb;
1717         tx_buff->index = index;
1718         tx_buff->pool_index = queue_num;
1719
1720         memset(&tx_crq, 0, sizeof(tx_crq));
1721         tx_crq.v1.first = IBMVNIC_CRQ_CMD;
1722         tx_crq.v1.type = IBMVNIC_TX_DESC;
1723         tx_crq.v1.n_crq_elem = 1;
1724         tx_crq.v1.n_sge = 1;
1725         tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
1726
1727         if (skb_is_gso(skb))
1728                 tx_crq.v1.correlator =
1729                         cpu_to_be32(index | IBMVNIC_TSO_POOL_MASK);
1730         else
1731                 tx_crq.v1.correlator = cpu_to_be32(index);
1732         tx_crq.v1.dma_reg = cpu_to_be16(tx_pool->long_term_buff.map_id);
1733         tx_crq.v1.sge_len = cpu_to_be32(skb->len);
1734         tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
1735
1736         if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
1737                 tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
1738                 tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
1739         }
1740
1741         if (skb->protocol == htons(ETH_P_IP)) {
1742                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
1743                 proto = ip_hdr(skb)->protocol;
1744         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1745                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
1746                 proto = ipv6_hdr(skb)->nexthdr;
1747         }
1748
1749         if (proto == IPPROTO_TCP)
1750                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
1751         else if (proto == IPPROTO_UDP)
1752                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
1753
1754         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1755                 tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
1756                 hdrs += 2;
1757         }
1758         if (skb_is_gso(skb)) {
1759                 tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
1760                 tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
1761                 hdrs += 2;
1762         }
1763
1764         if ((*hdrs >> 7) & 1)
1765                 build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
1766
1767         tx_crq.v1.n_crq_elem = num_entries;
1768         tx_buff->num_entries = num_entries;
1769         /* flush buffer if current entry can not fit */
1770         if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
1771                 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1772                 if (lpar_rc != H_SUCCESS)
1773                         goto tx_flush_err;
1774         }
1775
1776         indir_arr[0] = tx_crq;
1777         memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
1778                num_entries * sizeof(struct ibmvnic_generic_scrq));
1779         ind_bufp->index += num_entries;
1780         if (__netdev_tx_sent_queue(txq, skb->len,
1781                                    netdev_xmit_more() &&
1782                                    ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
1783                 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1784                 if (lpar_rc != H_SUCCESS)
1785                         goto tx_err;
1786         }
1787
1788         if (atomic_add_return(num_entries, &tx_scrq->used)
1789                                         >= adapter->req_tx_entries_per_subcrq) {
1790                 netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
1791                 netif_stop_subqueue(netdev, queue_num);
1792         }
1793
1794         tx_packets++;
1795         tx_bytes += skb->len;
1796         txq->trans_start = jiffies;
1797         ret = NETDEV_TX_OK;
1798         goto out;
1799
1800 tx_flush_err:
1801         dev_kfree_skb_any(skb);
1802         tx_buff->skb = NULL;
1803         tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
1804                                   tx_pool->num_buffers - 1 :
1805                                   tx_pool->consumer_index - 1;
1806         tx_dropped++;
1807 tx_err:
1808         if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
1809                 dev_err_ratelimited(dev, "tx: send failed\n");
1810
1811         if (lpar_rc == H_CLOSED || adapter->failover_pending) {
1812                 /* Disable TX and report carrier off if queue is closed
1813                  * or pending failover.
1814                  * Firmware guarantees that a signal will be sent to the
1815                  * driver, triggering a reset or some other action.
1816                  */
1817                 netif_tx_stop_all_queues(netdev);
1818                 netif_carrier_off(netdev);
1819         }
1820 out:
1821         netdev->stats.tx_dropped += tx_dropped;
1822         netdev->stats.tx_bytes += tx_bytes;
1823         netdev->stats.tx_packets += tx_packets;
1824         adapter->tx_send_failed += tx_send_failed;
1825         adapter->tx_map_failed += tx_map_failed;
1826         adapter->tx_stats_buffers[queue_num].packets += tx_packets;
1827         adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
1828         adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
1829
1830         return ret;
1831 }
1832
1833 static void ibmvnic_set_multi(struct net_device *netdev)
1834 {
1835         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1836         struct netdev_hw_addr *ha;
1837         union ibmvnic_crq crq;
1838
1839         memset(&crq, 0, sizeof(crq));
1840         crq.request_capability.first = IBMVNIC_CRQ_CMD;
1841         crq.request_capability.cmd = REQUEST_CAPABILITY;
1842
1843         if (netdev->flags & IFF_PROMISC) {
1844                 if (!adapter->promisc_supported)
1845                         return;
1846         } else {
1847                 if (netdev->flags & IFF_ALLMULTI) {
1848                         /* Accept all multicast */
1849                         memset(&crq, 0, sizeof(crq));
1850                         crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
1851                         crq.multicast_ctrl.cmd = MULTICAST_CTRL;
1852                         crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
1853                         ibmvnic_send_crq(adapter, &crq);
1854                 } else if (netdev_mc_empty(netdev)) {
1855                         /* Reject all multicast */
1856                         memset(&crq, 0, sizeof(crq));
1857                         crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
1858                         crq.multicast_ctrl.cmd = MULTICAST_CTRL;
1859                         crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
1860                         ibmvnic_send_crq(adapter, &crq);
1861                 } else {
1862                         /* Accept one or more multicast(s) */
1863                         netdev_for_each_mc_addr(ha, netdev) {
1864                                 memset(&crq, 0, sizeof(crq));
1865                                 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
1866                                 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
1867                                 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
1868                                 ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
1869                                                 ha->addr);
1870                                 ibmvnic_send_crq(adapter, &crq);
1871                         }
1872                 }
1873         }
1874 }
1875
1876 static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
1877 {
1878         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1879         union ibmvnic_crq crq;
1880         int rc;
1881
1882         if (!is_valid_ether_addr(dev_addr)) {
1883                 rc = -EADDRNOTAVAIL;
1884                 goto err;
1885         }
1886
1887         memset(&crq, 0, sizeof(crq));
1888         crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
1889         crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
1890         ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
1891
1892         mutex_lock(&adapter->fw_lock);
1893         adapter->fw_done_rc = 0;
1894         reinit_completion(&adapter->fw_done);
1895
1896         rc = ibmvnic_send_crq(adapter, &crq);
1897         if (rc) {
1898                 rc = -EIO;
1899                 mutex_unlock(&adapter->fw_lock);
1900                 goto err;
1901         }
1902
1903         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1904         /* netdev->dev_addr is changed in handle_change_mac_rsp function */
1905         if (rc || adapter->fw_done_rc) {
1906                 rc = -EIO;
1907                 mutex_unlock(&adapter->fw_lock);
1908                 goto err;
1909         }
1910         mutex_unlock(&adapter->fw_lock);
1911         return 0;
1912 err:
1913         ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
1914         return rc;
1915 }
1916
1917 static int ibmvnic_set_mac(struct net_device *netdev, void *p)
1918 {
1919         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1920         struct sockaddr *addr = p;
1921         int rc;
1922
1923         rc = 0;
1924         if (!is_valid_ether_addr(addr->sa_data))
1925                 return -EADDRNOTAVAIL;
1926
1927         ether_addr_copy(adapter->mac_addr, addr->sa_data);
1928         if (adapter->state != VNIC_PROBED)
1929                 rc = __ibmvnic_set_mac(netdev, addr->sa_data);
1930
1931         return rc;
1932 }
1933
1934 static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
1935 {
1936         switch (reason) {
1937         case VNIC_RESET_FAILOVER:
1938                 return "FAILOVER";
1939         case VNIC_RESET_MOBILITY:
1940                 return "MOBILITY";
1941         case VNIC_RESET_FATAL:
1942                 return "FATAL";
1943         case VNIC_RESET_NON_FATAL:
1944                 return "NON_FATAL";
1945         case VNIC_RESET_TIMEOUT:
1946                 return "TIMEOUT";
1947         case VNIC_RESET_CHANGE_PARAM:
1948                 return "CHANGE_PARAM";
1949         default:
1950                 return "UNKNOWN";
1951         }
1952 }
1953
1954 /*
1955  * do_reset returns zero if we are able to keep processing reset events, or
1956  * non-zero if we hit a fatal error and must halt.
1957  */
1958 static int do_reset(struct ibmvnic_adapter *adapter,
1959                     struct ibmvnic_rwi *rwi, u32 reset_state)
1960 {
1961         u64 old_num_rx_queues, old_num_tx_queues;
1962         u64 old_num_rx_slots, old_num_tx_slots;
1963         struct net_device *netdev = adapter->netdev;
1964         int rc;
1965
1966         netdev_dbg(adapter->netdev,
1967                    "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
1968                    adapter_state_to_string(adapter->state),
1969                    adapter->failover_pending,
1970                    reset_reason_to_string(rwi->reset_reason),
1971                    adapter_state_to_string(reset_state));
1972
1973         adapter->reset_reason = rwi->reset_reason;
1974         /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
1975         if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
1976                 rtnl_lock();
1977
1978         /* Now that we have the rtnl lock, clear any pending failover.
1979          * This will ensure ibmvnic_open() has either completed or will
1980          * block until failover is complete.
1981          */
1982         if (rwi->reset_reason == VNIC_RESET_FAILOVER)
1983                 adapter->failover_pending = false;
1984
1985         /* read the state and check (again) after getting rtnl */
1986         reset_state = adapter->state;
1987
1988         if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
1989                 rc = -EBUSY;
1990                 goto out;
1991         }
1992
1993         netif_carrier_off(netdev);
1994
1995         old_num_rx_queues = adapter->req_rx_queues;
1996         old_num_tx_queues = adapter->req_tx_queues;
1997         old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
1998         old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
1999
2000         ibmvnic_cleanup(netdev);
2001
2002         if (reset_state == VNIC_OPEN &&
2003             adapter->reset_reason != VNIC_RESET_MOBILITY &&
2004             adapter->reset_reason != VNIC_RESET_FAILOVER) {
2005                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2006                         rc = __ibmvnic_close(netdev);
2007                         if (rc)
2008                                 goto out;
2009                 } else {
2010                         adapter->state = VNIC_CLOSING;
2011
2012                         /* Release the RTNL lock before link state change and
2013                          * re-acquire after the link state change to allow
2014                          * linkwatch_event to grab the RTNL lock and run during
2015                          * a reset.
2016                          */
2017                         rtnl_unlock();
2018                         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
2019                         rtnl_lock();
2020                         if (rc)
2021                                 goto out;
2022
2023                         if (adapter->state == VNIC_OPEN) {
2024                                 /* When we dropped rtnl, ibmvnic_open() got
2025                                  * it and noticed that we are resetting and
2026                                  * set the adapter state to OPEN. Update our
2027                                  * new "target" state, and resume the reset
2028                                  * from VNIC_CLOSING state.
2029                                  */
2030                                 netdev_dbg(netdev,
2031                                            "Open changed state from %s, updating.\n",
2032                                            adapter_state_to_string(reset_state));
2033                                 reset_state = VNIC_OPEN;
2034                                 adapter->state = VNIC_CLOSING;
2035                         }
2036
2037                         if (adapter->state != VNIC_CLOSING) {
2038                                 /* If someone else changed the adapter state
2039                                  * when we dropped the rtnl, fail the reset
2040                                  */
2041                                 rc = -1;
2042                                 goto out;
2043                         }
2044                         adapter->state = VNIC_CLOSED;
2045                 }
2046         }
2047
2048         if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2049                 release_resources(adapter);
2050                 release_sub_crqs(adapter, 1);
2051                 release_crq_queue(adapter);
2052         }
2053
2054         if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
2055                 /* remove the closed state so when we call open it appears
2056                  * we are coming from the probed state.
2057                  */
2058                 adapter->state = VNIC_PROBED;
2059
2060                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2061                         rc = init_crq_queue(adapter);
2062                 } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
2063                         rc = ibmvnic_reenable_crq_queue(adapter);
2064                         release_sub_crqs(adapter, 1);
2065                 } else {
2066                         rc = ibmvnic_reset_crq(adapter);
2067                         if (rc == H_CLOSED || rc == H_SUCCESS) {
2068                                 rc = vio_enable_interrupts(adapter->vdev);
2069                                 if (rc)
2070                                         netdev_err(adapter->netdev,
2071                                                    "Reset failed to enable interrupts. rc=%d\n",
2072                                                    rc);
2073                         }
2074                 }
2075
2076                 if (rc) {
2077                         netdev_err(adapter->netdev,
2078                                    "Reset couldn't initialize crq. rc=%d\n", rc);
2079                         goto out;
2080                 }
2081
2082                 rc = ibmvnic_reset_init(adapter, true);
2083                 if (rc) {
2084                         rc = IBMVNIC_INIT_FAILED;
2085                         goto out;
2086                 }
2087
2088                 /* If the adapter was in PROBE state prior to the reset,
2089                  * exit here.
2090                  */
2091                 if (reset_state == VNIC_PROBED) {
2092                         rc = 0;
2093                         goto out;
2094                 }
2095
2096                 rc = ibmvnic_login(netdev);
2097                 if (rc)
2098                         goto out;
2099
2100                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2101                         rc = init_resources(adapter);
2102                         if (rc)
2103                                 goto out;
2104                 } else if (adapter->req_rx_queues != old_num_rx_queues ||
2105                     adapter->req_tx_queues != old_num_tx_queues ||
2106                     adapter->req_rx_add_entries_per_subcrq !=
2107                     old_num_rx_slots ||
2108                     adapter->req_tx_entries_per_subcrq !=
2109                     old_num_tx_slots ||
2110                     !adapter->rx_pool ||
2111                     !adapter->tso_pool ||
2112                     !adapter->tx_pool) {
2113                         release_rx_pools(adapter);
2114                         release_tx_pools(adapter);
2115                         release_napi(adapter);
2116                         release_vpd_data(adapter);
2117
2118                         rc = init_resources(adapter);
2119                         if (rc)
2120                                 goto out;
2121
2122                 } else {
2123                         rc = reset_tx_pools(adapter);
2124                         if (rc) {
2125                                 netdev_dbg(adapter->netdev, "reset tx pools failed (%d)\n",
2126                                            rc);
2127                                 goto out;
2128                         }
2129
2130                         rc = reset_rx_pools(adapter);
2131                         if (rc) {
2132                                 netdev_dbg(adapter->netdev, "reset rx pools failed (%d)\n",
2133                                            rc);
2134                                 goto out;
2135                         }
2136                 }
2137                 ibmvnic_disable_irqs(adapter);
2138         }
2139         adapter->state = VNIC_CLOSED;
2140
2141         if (reset_state == VNIC_CLOSED) {
2142                 rc = 0;
2143                 goto out;
2144         }
2145
2146         rc = __ibmvnic_open(netdev);
2147         if (rc) {
2148                 rc = IBMVNIC_OPEN_FAILED;
2149                 goto out;
2150         }
2151
2152         /* refresh device's multicast list */
2153         ibmvnic_set_multi(netdev);
2154
2155         if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
2156             adapter->reset_reason == VNIC_RESET_MOBILITY)
2157                 __netdev_notify_peers(netdev);
2158
2159         rc = 0;
2160
2161 out:
2162         /* restore the adapter state if reset failed */
2163         if (rc)
2164                 adapter->state = reset_state;
2165         /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
2166         if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
2167                 rtnl_unlock();
2168
2169         netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
2170                    adapter_state_to_string(adapter->state),
2171                    adapter->failover_pending, rc);
2172         return rc;
2173 }
2174
2175 static int do_hard_reset(struct ibmvnic_adapter *adapter,
2176                          struct ibmvnic_rwi *rwi, u32 reset_state)
2177 {
2178         struct net_device *netdev = adapter->netdev;
2179         int rc;
2180
2181         netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
2182                    reset_reason_to_string(rwi->reset_reason));
2183
2184         /* read the state and check (again) after getting rtnl */
2185         reset_state = adapter->state;
2186
2187         if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
2188                 rc = -EBUSY;
2189                 goto out;
2190         }
2191
2192         netif_carrier_off(netdev);
2193         adapter->reset_reason = rwi->reset_reason;
2194
2195         ibmvnic_cleanup(netdev);
2196         release_resources(adapter);
2197         release_sub_crqs(adapter, 0);
2198         release_crq_queue(adapter);
2199
2200         /* remove the closed state so when we call open it appears
2201          * we are coming from the probed state.
2202          */
2203         adapter->state = VNIC_PROBED;
2204
2205         reinit_completion(&adapter->init_done);
2206         rc = init_crq_queue(adapter);
2207         if (rc) {
2208                 netdev_err(adapter->netdev,
2209                            "Couldn't initialize crq. rc=%d\n", rc);
2210                 goto out;
2211         }
2212
2213         rc = ibmvnic_reset_init(adapter, false);
2214         if (rc)
2215                 goto out;
2216
2217         /* If the adapter was in PROBE state prior to the reset,
2218          * exit here.
2219          */
2220         if (reset_state == VNIC_PROBED)
2221                 goto out;
2222
2223         rc = ibmvnic_login(netdev);
2224         if (rc)
2225                 goto out;
2226
2227         rc = init_resources(adapter);
2228         if (rc)
2229                 goto out;
2230
2231         ibmvnic_disable_irqs(adapter);
2232         adapter->state = VNIC_CLOSED;
2233
2234         if (reset_state == VNIC_CLOSED)
2235                 goto out;
2236
2237         rc = __ibmvnic_open(netdev);
2238         if (rc) {
2239                 rc = IBMVNIC_OPEN_FAILED;
2240                 goto out;
2241         }
2242
2243         __netdev_notify_peers(netdev);
2244 out:
2245         /* restore adapter state if reset failed */
2246         if (rc)
2247                 adapter->state = reset_state;
2248         netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
2249                    adapter_state_to_string(adapter->state),
2250                    adapter->failover_pending, rc);
2251         return rc;
2252 }
2253
2254 static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
2255 {
2256         struct ibmvnic_rwi *rwi;
2257         unsigned long flags;
2258
2259         spin_lock_irqsave(&adapter->rwi_lock, flags);
2260
2261         if (!list_empty(&adapter->rwi_list)) {
2262                 rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
2263                                        list);
2264                 list_del(&rwi->list);
2265         } else {
2266                 rwi = NULL;
2267         }
2268
2269         spin_unlock_irqrestore(&adapter->rwi_lock, flags);
2270         return rwi;
2271 }
2272
2273 static void __ibmvnic_reset(struct work_struct *work)
2274 {
2275         struct ibmvnic_rwi *rwi;
2276         struct ibmvnic_adapter *adapter;
2277         bool saved_state = false;
2278         unsigned long flags;
2279         u32 reset_state;
2280         int rc = 0;
2281
2282         adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
2283
2284         if (test_and_set_bit_lock(0, &adapter->resetting)) {
2285                 queue_delayed_work(system_long_wq,
2286                                    &adapter->ibmvnic_delayed_reset,
2287                                    IBMVNIC_RESET_DELAY);
2288                 return;
2289         }
2290
2291         rwi = get_next_rwi(adapter);
2292         while (rwi) {
2293                 spin_lock_irqsave(&adapter->state_lock, flags);
2294
2295                 if (adapter->state == VNIC_REMOVING ||
2296                     adapter->state == VNIC_REMOVED) {
2297                         spin_unlock_irqrestore(&adapter->state_lock, flags);
2298                         kfree(rwi);
2299                         rc = EBUSY;
2300                         break;
2301                 }
2302
2303                 if (!saved_state) {
2304                         reset_state = adapter->state;
2305                         saved_state = true;
2306                 }
2307                 spin_unlock_irqrestore(&adapter->state_lock, flags);
2308
2309                 if (adapter->force_reset_recovery) {
2310                         /* Since we are doing a hard reset now, clear the
2311                          * failover_pending flag so we don't ignore any
2312                          * future MOBILITY or other resets.
2313                          */
2314                         adapter->failover_pending = false;
2315
2316                         /* Transport event occurred during previous reset */
2317                         if (adapter->wait_for_reset) {
2318                                 /* Previous was CHANGE_PARAM; caller locked */
2319                                 adapter->force_reset_recovery = false;
2320                                 rc = do_hard_reset(adapter, rwi, reset_state);
2321                         } else {
2322                                 rtnl_lock();
2323                                 adapter->force_reset_recovery = false;
2324                                 rc = do_hard_reset(adapter, rwi, reset_state);
2325                                 rtnl_unlock();
2326                         }
2327                         if (rc) {
2328                                 /* give backing device time to settle down */
2329                                 netdev_dbg(adapter->netdev,
2330                                            "[S:%s] Hard reset failed, waiting 60 secs\n",
2331                                            adapter_state_to_string(adapter->state));
2332                                 set_current_state(TASK_UNINTERRUPTIBLE);
2333                                 schedule_timeout(60 * HZ);
2334                         }
2335                 } else {
2336                         rc = do_reset(adapter, rwi, reset_state);
2337                 }
2338                 kfree(rwi);
2339                 adapter->last_reset_time = jiffies;
2340
2341                 if (rc)
2342                         netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
2343
2344                 rwi = get_next_rwi(adapter);
2345
2346                 if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
2347                             rwi->reset_reason == VNIC_RESET_MOBILITY))
2348                         adapter->force_reset_recovery = true;
2349         }
2350
2351         if (adapter->wait_for_reset) {
2352                 adapter->reset_done_rc = rc;
2353                 complete(&adapter->reset_done);
2354         }
2355
2356         clear_bit_unlock(0, &adapter->resetting);
2357
2358         netdev_dbg(adapter->netdev,
2359                    "[S:%s FRR:%d WFR:%d] Done processing resets\n",
2360                    adapter_state_to_string(adapter->state),
2361                    adapter->force_reset_recovery,
2362                    adapter->wait_for_reset);
2363 }
2364
2365 static void __ibmvnic_delayed_reset(struct work_struct *work)
2366 {
2367         struct ibmvnic_adapter *adapter;
2368
2369         adapter = container_of(work, struct ibmvnic_adapter,
2370                                ibmvnic_delayed_reset.work);
2371         __ibmvnic_reset(&adapter->ibmvnic_reset);
2372 }
2373
2374 static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
2375                          enum ibmvnic_reset_reason reason)
2376 {
2377         struct list_head *entry, *tmp_entry;
2378         struct ibmvnic_rwi *rwi, *tmp;
2379         struct net_device *netdev = adapter->netdev;
2380         unsigned long flags;
2381         int ret;
2382
2383         spin_lock_irqsave(&adapter->rwi_lock, flags);
2384
2385         /* If failover is pending don't schedule any other reset.
2386          * Instead let the failover complete. If there is already a
2387          * a failover reset scheduled, we will detect and drop the
2388          * duplicate reset when walking the ->rwi_list below.
2389          */
2390         if (adapter->state == VNIC_REMOVING ||
2391             adapter->state == VNIC_REMOVED ||
2392             (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
2393                 ret = EBUSY;
2394                 netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
2395                 goto err;
2396         }
2397
2398         if (adapter->state == VNIC_PROBING) {
2399                 netdev_warn(netdev, "Adapter reset during probe\n");
2400                 adapter->init_done_rc = EAGAIN;
2401                 ret = EAGAIN;
2402                 goto err;
2403         }
2404
2405         list_for_each(entry, &adapter->rwi_list) {
2406                 tmp = list_entry(entry, struct ibmvnic_rwi, list);
2407                 if (tmp->reset_reason == reason) {
2408                         netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
2409                                    reset_reason_to_string(reason));
2410                         ret = EBUSY;
2411                         goto err;
2412                 }
2413         }
2414
2415         rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
2416         if (!rwi) {
2417                 ret = ENOMEM;
2418                 goto err;
2419         }
2420         /* if we just received a transport event,
2421          * flush reset queue and process this reset
2422          */
2423         if (adapter->force_reset_recovery && !list_empty(&adapter->rwi_list)) {
2424                 list_for_each_safe(entry, tmp_entry, &adapter->rwi_list)
2425                         list_del(entry);
2426         }
2427         rwi->reset_reason = reason;
2428         list_add_tail(&rwi->list, &adapter->rwi_list);
2429         netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
2430                    reset_reason_to_string(reason));
2431         queue_work(system_long_wq, &adapter->ibmvnic_reset);
2432
2433         ret = 0;
2434 err:
2435         /* ibmvnic_close() below can block, so drop the lock first */
2436         spin_unlock_irqrestore(&adapter->rwi_lock, flags);
2437
2438         if (ret == ENOMEM)
2439                 ibmvnic_close(netdev);
2440
2441         return -ret;
2442 }
2443
2444 static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
2445 {
2446         struct ibmvnic_adapter *adapter = netdev_priv(dev);
2447
2448         if (test_bit(0, &adapter->resetting)) {
2449                 netdev_err(adapter->netdev,
2450                            "Adapter is resetting, skip timeout reset\n");
2451                 return;
2452         }
2453         /* No queuing up reset until at least 5 seconds (default watchdog val)
2454          * after last reset
2455          */
2456         if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
2457                 netdev_dbg(dev, "Not yet time to tx timeout.\n");
2458                 return;
2459         }
2460         ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
2461 }
2462
2463 static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
2464                                   struct ibmvnic_rx_buff *rx_buff)
2465 {
2466         struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
2467
2468         rx_buff->skb = NULL;
2469
2470         pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
2471         pool->next_alloc = (pool->next_alloc + 1) % pool->size;
2472
2473         atomic_dec(&pool->available);
2474 }
2475
2476 static int ibmvnic_poll(struct napi_struct *napi, int budget)
2477 {
2478         struct ibmvnic_sub_crq_queue *rx_scrq;
2479         struct ibmvnic_adapter *adapter;
2480         struct net_device *netdev;
2481         int frames_processed;
2482         int scrq_num;
2483
2484         netdev = napi->dev;
2485         adapter = netdev_priv(netdev);
2486         scrq_num = (int)(napi - adapter->napi);
2487         frames_processed = 0;
2488         rx_scrq = adapter->rx_scrq[scrq_num];
2489
2490 restart_poll:
2491         while (frames_processed < budget) {
2492                 struct sk_buff *skb;
2493                 struct ibmvnic_rx_buff *rx_buff;
2494                 union sub_crq *next;
2495                 u32 length;
2496                 u16 offset;
2497                 u8 flags = 0;
2498
2499                 if (unlikely(test_bit(0, &adapter->resetting) &&
2500                              adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
2501                         enable_scrq_irq(adapter, rx_scrq);
2502                         napi_complete_done(napi, frames_processed);
2503                         return frames_processed;
2504                 }
2505
2506                 if (!pending_scrq(adapter, rx_scrq))
2507                         break;
2508                 next = ibmvnic_next_scrq(adapter, rx_scrq);
2509                 rx_buff = (struct ibmvnic_rx_buff *)
2510                           be64_to_cpu(next->rx_comp.correlator);
2511                 /* do error checking */
2512                 if (next->rx_comp.rc) {
2513                         netdev_dbg(netdev, "rx buffer returned with rc %x\n",
2514                                    be16_to_cpu(next->rx_comp.rc));
2515                         /* free the entry */
2516                         next->rx_comp.first = 0;
2517                         dev_kfree_skb_any(rx_buff->skb);
2518                         remove_buff_from_pool(adapter, rx_buff);
2519                         continue;
2520                 } else if (!rx_buff->skb) {
2521                         /* free the entry */
2522                         next->rx_comp.first = 0;
2523                         remove_buff_from_pool(adapter, rx_buff);
2524                         continue;
2525                 }
2526
2527                 length = be32_to_cpu(next->rx_comp.len);
2528                 offset = be16_to_cpu(next->rx_comp.off_frame_data);
2529                 flags = next->rx_comp.flags;
2530                 skb = rx_buff->skb;
2531                 /* load long_term_buff before copying to skb */
2532                 dma_rmb();
2533                 skb_copy_to_linear_data(skb, rx_buff->data + offset,
2534                                         length);
2535
2536                 /* VLAN Header has been stripped by the system firmware and
2537                  * needs to be inserted by the driver
2538                  */
2539                 if (adapter->rx_vlan_header_insertion &&
2540                     (flags & IBMVNIC_VLAN_STRIPPED))
2541                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2542                                                ntohs(next->rx_comp.vlan_tci));
2543
2544                 /* free the entry */
2545                 next->rx_comp.first = 0;
2546                 remove_buff_from_pool(adapter, rx_buff);
2547
2548                 skb_put(skb, length);
2549                 skb->protocol = eth_type_trans(skb, netdev);
2550                 skb_record_rx_queue(skb, scrq_num);
2551
2552                 if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
2553                     flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
2554                         skb->ip_summed = CHECKSUM_UNNECESSARY;
2555                 }
2556
2557                 length = skb->len;
2558                 napi_gro_receive(napi, skb); /* send it up */
2559                 netdev->stats.rx_packets++;
2560                 netdev->stats.rx_bytes += length;
2561                 adapter->rx_stats_buffers[scrq_num].packets++;
2562                 adapter->rx_stats_buffers[scrq_num].bytes += length;
2563                 frames_processed++;
2564         }
2565
2566         if (adapter->state != VNIC_CLOSING &&
2567             ((atomic_read(&adapter->rx_pool[scrq_num].available) <
2568               adapter->req_rx_add_entries_per_subcrq / 2) ||
2569               frames_processed < budget))
2570                 replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
2571         if (frames_processed < budget) {
2572                 if (napi_complete_done(napi, frames_processed)) {
2573                         enable_scrq_irq(adapter, rx_scrq);
2574                         if (pending_scrq(adapter, rx_scrq)) {
2575                                 if (napi_reschedule(napi)) {
2576                                         disable_scrq_irq(adapter, rx_scrq);
2577                                         goto restart_poll;
2578                                 }
2579                         }
2580                 }
2581         }
2582         return frames_processed;
2583 }
2584
2585 static int wait_for_reset(struct ibmvnic_adapter *adapter)
2586 {
2587         int rc, ret;
2588
2589         adapter->fallback.mtu = adapter->req_mtu;
2590         adapter->fallback.rx_queues = adapter->req_rx_queues;
2591         adapter->fallback.tx_queues = adapter->req_tx_queues;
2592         adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
2593         adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
2594
2595         reinit_completion(&adapter->reset_done);
2596         adapter->wait_for_reset = true;
2597         rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
2598
2599         if (rc) {
2600                 ret = rc;
2601                 goto out;
2602         }
2603         rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
2604         if (rc) {
2605                 ret = -ENODEV;
2606                 goto out;
2607         }
2608
2609         ret = 0;
2610         if (adapter->reset_done_rc) {
2611                 ret = -EIO;
2612                 adapter->desired.mtu = adapter->fallback.mtu;
2613                 adapter->desired.rx_queues = adapter->fallback.rx_queues;
2614                 adapter->desired.tx_queues = adapter->fallback.tx_queues;
2615                 adapter->desired.rx_entries = adapter->fallback.rx_entries;
2616                 adapter->desired.tx_entries = adapter->fallback.tx_entries;
2617
2618                 reinit_completion(&adapter->reset_done);
2619                 adapter->wait_for_reset = true;
2620                 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
2621                 if (rc) {
2622                         ret = rc;
2623                         goto out;
2624                 }
2625                 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
2626                                                  60000);
2627                 if (rc) {
2628                         ret = -ENODEV;
2629                         goto out;
2630                 }
2631         }
2632 out:
2633         adapter->wait_for_reset = false;
2634
2635         return ret;
2636 }
2637
2638 static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
2639 {
2640         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2641
2642         adapter->desired.mtu = new_mtu + ETH_HLEN;
2643
2644         return wait_for_reset(adapter);
2645 }
2646
2647 static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
2648                                                 struct net_device *dev,
2649                                                 netdev_features_t features)
2650 {
2651         /* Some backing hardware adapters can not
2652          * handle packets with a MSS less than 224
2653          * or with only one segment.
2654          */
2655         if (skb_is_gso(skb)) {
2656                 if (skb_shinfo(skb)->gso_size < 224 ||
2657                     skb_shinfo(skb)->gso_segs == 1)
2658                         features &= ~NETIF_F_GSO_MASK;
2659         }
2660
2661         return features;
2662 }
2663
2664 static const struct net_device_ops ibmvnic_netdev_ops = {
2665         .ndo_open               = ibmvnic_open,
2666         .ndo_stop               = ibmvnic_close,
2667         .ndo_start_xmit         = ibmvnic_xmit,
2668         .ndo_set_rx_mode        = ibmvnic_set_multi,
2669         .ndo_set_mac_address    = ibmvnic_set_mac,
2670         .ndo_validate_addr      = eth_validate_addr,
2671         .ndo_tx_timeout         = ibmvnic_tx_timeout,
2672         .ndo_change_mtu         = ibmvnic_change_mtu,
2673         .ndo_features_check     = ibmvnic_features_check,
2674 };
2675
2676 /* ethtool functions */
2677
2678 static int ibmvnic_get_link_ksettings(struct net_device *netdev,
2679                                       struct ethtool_link_ksettings *cmd)
2680 {
2681         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2682         int rc;
2683
2684         rc = send_query_phys_parms(adapter);
2685         if (rc) {
2686                 adapter->speed = SPEED_UNKNOWN;
2687                 adapter->duplex = DUPLEX_UNKNOWN;
2688         }
2689         cmd->base.speed = adapter->speed;
2690         cmd->base.duplex = adapter->duplex;
2691         cmd->base.port = PORT_FIBRE;
2692         cmd->base.phy_address = 0;
2693         cmd->base.autoneg = AUTONEG_ENABLE;
2694
2695         return 0;
2696 }
2697
2698 static void ibmvnic_get_drvinfo(struct net_device *netdev,
2699                                 struct ethtool_drvinfo *info)
2700 {
2701         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2702
2703         strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
2704         strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
2705         strscpy(info->fw_version, adapter->fw_version,
2706                 sizeof(info->fw_version));
2707 }
2708
2709 static u32 ibmvnic_get_msglevel(struct net_device *netdev)
2710 {
2711         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2712
2713         return adapter->msg_enable;
2714 }
2715
2716 static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
2717 {
2718         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2719
2720         adapter->msg_enable = data;
2721 }
2722
2723 static u32 ibmvnic_get_link(struct net_device *netdev)
2724 {
2725         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2726
2727         /* Don't need to send a query because we request a logical link up at
2728          * init and then we wait for link state indications
2729          */
2730         return adapter->logical_link_state;
2731 }
2732
2733 static void ibmvnic_get_ringparam(struct net_device *netdev,
2734                                   struct ethtool_ringparam *ring)
2735 {
2736         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2737
2738         if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
2739                 ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
2740                 ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
2741         } else {
2742                 ring->rx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
2743                 ring->tx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
2744         }
2745         ring->rx_mini_max_pending = 0;
2746         ring->rx_jumbo_max_pending = 0;
2747         ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
2748         ring->tx_pending = adapter->req_tx_entries_per_subcrq;
2749         ring->rx_mini_pending = 0;
2750         ring->rx_jumbo_pending = 0;
2751 }
2752
2753 static int ibmvnic_set_ringparam(struct net_device *netdev,
2754                                  struct ethtool_ringparam *ring)
2755 {
2756         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2757         int ret;
2758
2759         ret = 0;
2760         adapter->desired.rx_entries = ring->rx_pending;
2761         adapter->desired.tx_entries = ring->tx_pending;
2762
2763         ret = wait_for_reset(adapter);
2764
2765         if (!ret &&
2766             (adapter->req_rx_add_entries_per_subcrq != ring->rx_pending ||
2767              adapter->req_tx_entries_per_subcrq != ring->tx_pending))
2768                 netdev_info(netdev,
2769                             "Could not match full ringsize request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
2770                             ring->rx_pending, ring->tx_pending,
2771                             adapter->req_rx_add_entries_per_subcrq,
2772                             adapter->req_tx_entries_per_subcrq);
2773         return ret;
2774 }
2775
2776 static void ibmvnic_get_channels(struct net_device *netdev,
2777                                  struct ethtool_channels *channels)
2778 {
2779         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2780
2781         if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
2782                 channels->max_rx = adapter->max_rx_queues;
2783                 channels->max_tx = adapter->max_tx_queues;
2784         } else {
2785                 channels->max_rx = IBMVNIC_MAX_QUEUES;
2786                 channels->max_tx = IBMVNIC_MAX_QUEUES;
2787         }
2788
2789         channels->max_other = 0;
2790         channels->max_combined = 0;
2791         channels->rx_count = adapter->req_rx_queues;
2792         channels->tx_count = adapter->req_tx_queues;
2793         channels->other_count = 0;
2794         channels->combined_count = 0;
2795 }
2796
2797 static int ibmvnic_set_channels(struct net_device *netdev,
2798                                 struct ethtool_channels *channels)
2799 {
2800         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2801         int ret;
2802
2803         ret = 0;
2804         adapter->desired.rx_queues = channels->rx_count;
2805         adapter->desired.tx_queues = channels->tx_count;
2806
2807         ret = wait_for_reset(adapter);
2808
2809         if (!ret &&
2810             (adapter->req_rx_queues != channels->rx_count ||
2811              adapter->req_tx_queues != channels->tx_count))
2812                 netdev_info(netdev,
2813                             "Could not match full channels request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
2814                             channels->rx_count, channels->tx_count,
2815                             adapter->req_rx_queues, adapter->req_tx_queues);
2816         return ret;
2817 }
2818
2819 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2820 {
2821         struct ibmvnic_adapter *adapter = netdev_priv(dev);
2822         int i;
2823
2824         switch (stringset) {
2825         case ETH_SS_STATS:
2826                 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats);
2827                                 i++, data += ETH_GSTRING_LEN)
2828                         memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
2829
2830                 for (i = 0; i < adapter->req_tx_queues; i++) {
2831                         snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
2832                         data += ETH_GSTRING_LEN;
2833
2834                         snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
2835                         data += ETH_GSTRING_LEN;
2836
2837                         snprintf(data, ETH_GSTRING_LEN,
2838                                  "tx%d_dropped_packets", i);
2839                         data += ETH_GSTRING_LEN;
2840                 }
2841
2842                 for (i = 0; i < adapter->req_rx_queues; i++) {
2843                         snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
2844                         data += ETH_GSTRING_LEN;
2845
2846                         snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
2847                         data += ETH_GSTRING_LEN;
2848
2849                         snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
2850                         data += ETH_GSTRING_LEN;
2851                 }
2852                 break;
2853
2854         case ETH_SS_PRIV_FLAGS:
2855                 for (i = 0; i < ARRAY_SIZE(ibmvnic_priv_flags); i++)
2856                         strcpy(data + i * ETH_GSTRING_LEN,
2857                                ibmvnic_priv_flags[i]);
2858                 break;
2859         default:
2860                 return;
2861         }
2862 }
2863
2864 static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
2865 {
2866         struct ibmvnic_adapter *adapter = netdev_priv(dev);
2867
2868         switch (sset) {
2869         case ETH_SS_STATS:
2870                 return ARRAY_SIZE(ibmvnic_stats) +
2871                        adapter->req_tx_queues * NUM_TX_STATS +
2872                        adapter->req_rx_queues * NUM_RX_STATS;
2873         case ETH_SS_PRIV_FLAGS:
2874                 return ARRAY_SIZE(ibmvnic_priv_flags);
2875         default:
2876                 return -EOPNOTSUPP;
2877         }
2878 }
2879
2880 static void ibmvnic_get_ethtool_stats(struct net_device *dev,
2881                                       struct ethtool_stats *stats, u64 *data)
2882 {
2883         struct ibmvnic_adapter *adapter = netdev_priv(dev);
2884         union ibmvnic_crq crq;
2885         int i, j;
2886         int rc;
2887
2888         memset(&crq, 0, sizeof(crq));
2889         crq.request_statistics.first = IBMVNIC_CRQ_CMD;
2890         crq.request_statistics.cmd = REQUEST_STATISTICS;
2891         crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
2892         crq.request_statistics.len =
2893             cpu_to_be32(sizeof(struct ibmvnic_statistics));
2894
2895         /* Wait for data to be written */
2896         reinit_completion(&adapter->stats_done);
2897         rc = ibmvnic_send_crq(adapter, &crq);
2898         if (rc)
2899                 return;
2900         rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
2901         if (rc)
2902                 return;
2903
2904         for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
2905                 data[i] = be64_to_cpu(IBMVNIC_GET_STAT
2906                                       (adapter, ibmvnic_stats[i].offset));
2907
2908         for (j = 0; j < adapter->req_tx_queues; j++) {
2909                 data[i] = adapter->tx_stats_buffers[j].packets;
2910                 i++;
2911                 data[i] = adapter->tx_stats_buffers[j].bytes;
2912                 i++;
2913                 data[i] = adapter->tx_stats_buffers[j].dropped_packets;
2914                 i++;
2915         }
2916
2917         for (j = 0; j < adapter->req_rx_queues; j++) {
2918                 data[i] = adapter->rx_stats_buffers[j].packets;
2919                 i++;
2920                 data[i] = adapter->rx_stats_buffers[j].bytes;
2921                 i++;
2922                 data[i] = adapter->rx_stats_buffers[j].interrupts;
2923                 i++;
2924         }
2925 }
2926
2927 static u32 ibmvnic_get_priv_flags(struct net_device *netdev)
2928 {
2929         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2930
2931         return adapter->priv_flags;
2932 }
2933
2934 static int ibmvnic_set_priv_flags(struct net_device *netdev, u32 flags)
2935 {
2936         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2937         bool which_maxes = !!(flags & IBMVNIC_USE_SERVER_MAXES);
2938
2939         if (which_maxes)
2940                 adapter->priv_flags |= IBMVNIC_USE_SERVER_MAXES;
2941         else
2942                 adapter->priv_flags &= ~IBMVNIC_USE_SERVER_MAXES;
2943
2944         return 0;
2945 }
2946
2947 static const struct ethtool_ops ibmvnic_ethtool_ops = {
2948         .get_drvinfo            = ibmvnic_get_drvinfo,
2949         .get_msglevel           = ibmvnic_get_msglevel,
2950         .set_msglevel           = ibmvnic_set_msglevel,
2951         .get_link               = ibmvnic_get_link,
2952         .get_ringparam          = ibmvnic_get_ringparam,
2953         .set_ringparam          = ibmvnic_set_ringparam,
2954         .get_channels           = ibmvnic_get_channels,
2955         .set_channels           = ibmvnic_set_channels,
2956         .get_strings            = ibmvnic_get_strings,
2957         .get_sset_count         = ibmvnic_get_sset_count,
2958         .get_ethtool_stats      = ibmvnic_get_ethtool_stats,
2959         .get_link_ksettings     = ibmvnic_get_link_ksettings,
2960         .get_priv_flags         = ibmvnic_get_priv_flags,
2961         .set_priv_flags         = ibmvnic_set_priv_flags,
2962 };
2963
2964 /* Routines for managing CRQs/sCRQs  */
2965
2966 static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
2967                                    struct ibmvnic_sub_crq_queue *scrq)
2968 {
2969         int rc;
2970
2971         if (!scrq) {
2972                 netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
2973                 return -EINVAL;
2974         }
2975
2976         if (scrq->irq) {
2977                 free_irq(scrq->irq, scrq);
2978                 irq_dispose_mapping(scrq->irq);
2979                 scrq->irq = 0;
2980         }
2981
2982         if (scrq->msgs) {
2983                 memset(scrq->msgs, 0, 4 * PAGE_SIZE);
2984                 atomic_set(&scrq->used, 0);
2985                 scrq->cur = 0;
2986                 scrq->ind_buf.index = 0;
2987         } else {
2988                 netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
2989                 return -EINVAL;
2990         }
2991
2992         rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
2993                            4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
2994         return rc;
2995 }
2996
2997 static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
2998 {
2999         int i, rc;
3000
3001         if (!adapter->tx_scrq || !adapter->rx_scrq)
3002                 return -EINVAL;
3003
3004         for (i = 0; i < adapter->req_tx_queues; i++) {
3005                 netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
3006                 rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
3007                 if (rc)
3008                         return rc;
3009         }
3010
3011         for (i = 0; i < adapter->req_rx_queues; i++) {
3012                 netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
3013                 rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
3014                 if (rc)
3015                         return rc;
3016         }
3017
3018         return rc;
3019 }
3020
3021 static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
3022                                   struct ibmvnic_sub_crq_queue *scrq,
3023                                   bool do_h_free)
3024 {
3025         struct device *dev = &adapter->vdev->dev;
3026         long rc;
3027
3028         netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
3029
3030         if (do_h_free) {
3031                 /* Close the sub-crqs */
3032                 do {
3033                         rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
3034                                                 adapter->vdev->unit_address,
3035                                                 scrq->crq_num);
3036                 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
3037
3038                 if (rc) {
3039                         netdev_err(adapter->netdev,
3040                                    "Failed to release sub-CRQ %16lx, rc = %ld\n",
3041                                    scrq->crq_num, rc);
3042                 }
3043         }
3044
3045         dma_free_coherent(dev,
3046                           IBMVNIC_IND_ARR_SZ,
3047                           scrq->ind_buf.indir_arr,
3048                           scrq->ind_buf.indir_dma);
3049
3050         dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
3051                          DMA_BIDIRECTIONAL);
3052         free_pages((unsigned long)scrq->msgs, 2);
3053         kfree(scrq);
3054 }
3055
3056 static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
3057                                                         *adapter)
3058 {
3059         struct device *dev = &adapter->vdev->dev;
3060         struct ibmvnic_sub_crq_queue *scrq;
3061         int rc;
3062
3063         scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
3064         if (!scrq)
3065                 return NULL;
3066
3067         scrq->msgs =
3068                 (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
3069         if (!scrq->msgs) {
3070                 dev_warn(dev, "Couldn't allocate crq queue messages page\n");
3071                 goto zero_page_failed;
3072         }
3073
3074         scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
3075                                          DMA_BIDIRECTIONAL);
3076         if (dma_mapping_error(dev, scrq->msg_token)) {
3077                 dev_warn(dev, "Couldn't map crq queue messages page\n");
3078                 goto map_failed;
3079         }
3080
3081         rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
3082                            4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
3083
3084         if (rc == H_RESOURCE)
3085                 rc = ibmvnic_reset_crq(adapter);
3086
3087         if (rc == H_CLOSED) {
3088                 dev_warn(dev, "Partner adapter not ready, waiting.\n");
3089         } else if (rc) {
3090                 dev_warn(dev, "Error %d registering sub-crq\n", rc);
3091                 goto reg_failed;
3092         }
3093
3094         scrq->adapter = adapter;
3095         scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
3096         scrq->ind_buf.index = 0;
3097
3098         scrq->ind_buf.indir_arr =
3099                 dma_alloc_coherent(dev,
3100                                    IBMVNIC_IND_ARR_SZ,
3101                                    &scrq->ind_buf.indir_dma,
3102                                    GFP_KERNEL);
3103
3104         if (!scrq->ind_buf.indir_arr)
3105                 goto indir_failed;
3106
3107         spin_lock_init(&scrq->lock);
3108
3109         netdev_dbg(adapter->netdev,
3110                    "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
3111                    scrq->crq_num, scrq->hw_irq, scrq->irq);
3112
3113         return scrq;
3114
3115 indir_failed:
3116         do {
3117                 rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
3118                                         adapter->vdev->unit_address,
3119                                         scrq->crq_num);
3120         } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
3121 reg_failed:
3122         dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
3123                          DMA_BIDIRECTIONAL);
3124 map_failed:
3125         free_pages((unsigned long)scrq->msgs, 2);
3126 zero_page_failed:
3127         kfree(scrq);
3128
3129         return NULL;
3130 }
3131
3132 static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
3133 {
3134         int i;
3135
3136         if (adapter->tx_scrq) {
3137                 for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
3138                         if (!adapter->tx_scrq[i])
3139                                 continue;
3140
3141                         netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
3142                                    i);
3143                         if (adapter->tx_scrq[i]->irq) {
3144                                 free_irq(adapter->tx_scrq[i]->irq,
3145                                          adapter->tx_scrq[i]);
3146                                 irq_dispose_mapping(adapter->tx_scrq[i]->irq);
3147                                 adapter->tx_scrq[i]->irq = 0;
3148                         }
3149
3150                         release_sub_crq_queue(adapter, adapter->tx_scrq[i],
3151                                               do_h_free);
3152                 }
3153
3154                 kfree(adapter->tx_scrq);
3155                 adapter->tx_scrq = NULL;
3156                 adapter->num_active_tx_scrqs = 0;
3157         }
3158
3159         if (adapter->rx_scrq) {
3160                 for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
3161                         if (!adapter->rx_scrq[i])
3162                                 continue;
3163
3164                         netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
3165                                    i);
3166                         if (adapter->rx_scrq[i]->irq) {
3167                                 free_irq(adapter->rx_scrq[i]->irq,
3168                                          adapter->rx_scrq[i]);
3169                                 irq_dispose_mapping(adapter->rx_scrq[i]->irq);
3170                                 adapter->rx_scrq[i]->irq = 0;
3171                         }
3172
3173                         release_sub_crq_queue(adapter, adapter->rx_scrq[i],
3174                                               do_h_free);
3175                 }
3176
3177                 kfree(adapter->rx_scrq);
3178                 adapter->rx_scrq = NULL;
3179                 adapter->num_active_rx_scrqs = 0;
3180         }
3181 }
3182
3183 static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
3184                             struct ibmvnic_sub_crq_queue *scrq)
3185 {
3186         struct device *dev = &adapter->vdev->dev;
3187         unsigned long rc;
3188
3189         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
3190                                 H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
3191         if (rc)
3192                 dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
3193                         scrq->hw_irq, rc);
3194         return rc;
3195 }
3196
3197 static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
3198                            struct ibmvnic_sub_crq_queue *scrq)
3199 {
3200         struct device *dev = &adapter->vdev->dev;
3201         unsigned long rc;
3202
3203         if (scrq->hw_irq > 0x100000000ULL) {
3204                 dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
3205                 return 1;
3206         }
3207
3208         if (test_bit(0, &adapter->resetting) &&
3209             adapter->reset_reason == VNIC_RESET_MOBILITY) {
3210                 u64 val = (0xff000000) | scrq->hw_irq;
3211
3212                 rc = plpar_hcall_norets(H_EOI, val);
3213                 /* H_EOI would fail with rc = H_FUNCTION when running
3214                  * in XIVE mode which is expected, but not an error.
3215                  */
3216                 if (rc && rc != H_FUNCTION)
3217                         dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n",
3218                                 val, rc);
3219         }
3220
3221         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
3222                                 H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
3223         if (rc)
3224                 dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
3225                         scrq->hw_irq, rc);
3226         return rc;
3227 }
3228
3229 static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
3230                                struct ibmvnic_sub_crq_queue *scrq)
3231 {
3232         struct device *dev = &adapter->vdev->dev;
3233         struct ibmvnic_tx_pool *tx_pool;
3234         struct ibmvnic_tx_buff *txbuff;
3235         struct netdev_queue *txq;
3236         union sub_crq *next;
3237         int index;
3238         int i;
3239
3240 restart_loop:
3241         while (pending_scrq(adapter, scrq)) {
3242                 unsigned int pool = scrq->pool_index;
3243                 int num_entries = 0;
3244                 int total_bytes = 0;
3245                 int num_packets = 0;
3246
3247                 next = ibmvnic_next_scrq(adapter, scrq);
3248                 for (i = 0; i < next->tx_comp.num_comps; i++) {
3249                         index = be32_to_cpu(next->tx_comp.correlators[i]);
3250                         if (index & IBMVNIC_TSO_POOL_MASK) {
3251                                 tx_pool = &adapter->tso_pool[pool];
3252                                 index &= ~IBMVNIC_TSO_POOL_MASK;
3253                         } else {
3254                                 tx_pool = &adapter->tx_pool[pool];
3255                         }
3256
3257                         txbuff = &tx_pool->tx_buff[index];
3258                         num_packets++;
3259                         num_entries += txbuff->num_entries;
3260                         if (txbuff->skb) {
3261                                 total_bytes += txbuff->skb->len;
3262                                 if (next->tx_comp.rcs[i]) {
3263                                         dev_err(dev, "tx error %x\n",
3264                                                 next->tx_comp.rcs[i]);
3265                                         dev_kfree_skb_irq(txbuff->skb);
3266                                 } else {
3267                                         dev_consume_skb_irq(txbuff->skb);
3268                                 }
3269                                 txbuff->skb = NULL;
3270                         } else {
3271                                 netdev_warn(adapter->netdev,
3272                                             "TX completion received with NULL socket buffer\n");
3273                         }
3274                         tx_pool->free_map[tx_pool->producer_index] = index;
3275                         tx_pool->producer_index =
3276                                 (tx_pool->producer_index + 1) %
3277                                         tx_pool->num_buffers;
3278                 }
3279                 /* remove tx_comp scrq*/
3280                 next->tx_comp.first = 0;
3281
3282                 txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
3283                 netdev_tx_completed_queue(txq, num_packets, total_bytes);
3284
3285                 if (atomic_sub_return(num_entries, &scrq->used) <=
3286                     (adapter->req_tx_entries_per_subcrq / 2) &&
3287                     __netif_subqueue_stopped(adapter->netdev,
3288                                              scrq->pool_index)) {
3289                         netif_wake_subqueue(adapter->netdev, scrq->pool_index);
3290                         netdev_dbg(adapter->netdev, "Started queue %d\n",
3291                                    scrq->pool_index);
3292                 }
3293         }
3294
3295         enable_scrq_irq(adapter, scrq);
3296
3297         if (pending_scrq(adapter, scrq)) {
3298                 disable_scrq_irq(adapter, scrq);
3299                 goto restart_loop;
3300         }
3301
3302         return 0;
3303 }
3304
3305 static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
3306 {
3307         struct ibmvnic_sub_crq_queue *scrq = instance;
3308         struct ibmvnic_adapter *adapter = scrq->adapter;
3309
3310         disable_scrq_irq(adapter, scrq);
3311         ibmvnic_complete_tx(adapter, scrq);
3312
3313         return IRQ_HANDLED;
3314 }
3315
3316 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
3317 {
3318         struct ibmvnic_sub_crq_queue *scrq = instance;
3319         struct ibmvnic_adapter *adapter = scrq->adapter;
3320
3321         /* When booting a kdump kernel we can hit pending interrupts
3322          * prior to completing driver initialization.
3323          */
3324         if (unlikely(adapter->state != VNIC_OPEN))
3325                 return IRQ_NONE;
3326
3327         adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
3328
3329         if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
3330                 disable_scrq_irq(adapter, scrq);
3331                 __napi_schedule(&adapter->napi[scrq->scrq_num]);
3332         }
3333
3334         return IRQ_HANDLED;
3335 }
3336
3337 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
3338 {
3339         struct device *dev = &adapter->vdev->dev;
3340         struct ibmvnic_sub_crq_queue *scrq;
3341         int i = 0, j = 0;
3342         int rc = 0;
3343
3344         for (i = 0; i < adapter->req_tx_queues; i++) {
3345                 netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
3346                            i);
3347                 scrq = adapter->tx_scrq[i];
3348                 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
3349
3350                 if (!scrq->irq) {
3351                         rc = -EINVAL;
3352                         dev_err(dev, "Error mapping irq\n");
3353                         goto req_tx_irq_failed;
3354                 }
3355
3356                 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
3357                          adapter->vdev->unit_address, i);
3358                 rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
3359                                  0, scrq->name, scrq);
3360
3361                 if (rc) {
3362                         dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
3363                                 scrq->irq, rc);
3364                         irq_dispose_mapping(scrq->irq);
3365                         goto req_tx_irq_failed;
3366                 }
3367         }
3368
3369         for (i = 0; i < adapter->req_rx_queues; i++) {
3370                 netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
3371                            i);
3372                 scrq = adapter->rx_scrq[i];
3373                 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
3374                 if (!scrq->irq) {
3375                         rc = -EINVAL;
3376                         dev_err(dev, "Error mapping irq\n");
3377                         goto req_rx_irq_failed;
3378                 }
3379                 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
3380                          adapter->vdev->unit_address, i);
3381                 rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
3382                                  0, scrq->name, scrq);
3383                 if (rc) {
3384                         dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
3385                                 scrq->irq, rc);
3386                         irq_dispose_mapping(scrq->irq);
3387                         goto req_rx_irq_failed;
3388                 }
3389         }
3390         return rc;
3391
3392 req_rx_irq_failed:
3393         for (j = 0; j < i; j++) {
3394                 free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
3395                 irq_dispose_mapping(adapter->rx_scrq[j]->irq);
3396         }
3397         i = adapter->req_tx_queues;
3398 req_tx_irq_failed:
3399         for (j = 0; j < i; j++) {
3400                 free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
3401                 irq_dispose_mapping(adapter->tx_scrq[j]->irq);
3402         }
3403         release_sub_crqs(adapter, 1);
3404         return rc;
3405 }
3406
3407 static int init_sub_crqs(struct ibmvnic_adapter *adapter)
3408 {
3409         struct device *dev = &adapter->vdev->dev;
3410         struct ibmvnic_sub_crq_queue **allqueues;
3411         int registered_queues = 0;
3412         int total_queues;
3413         int more = 0;
3414         int i;
3415
3416         total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
3417
3418         allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
3419         if (!allqueues)
3420                 return -1;
3421
3422         for (i = 0; i < total_queues; i++) {
3423                 allqueues[i] = init_sub_crq_queue(adapter);
3424                 if (!allqueues[i]) {
3425                         dev_warn(dev, "Couldn't allocate all sub-crqs\n");
3426                         break;
3427                 }
3428                 registered_queues++;
3429         }
3430
3431         /* Make sure we were able to register the minimum number of queues */
3432         if (registered_queues <
3433             adapter->min_tx_queues + adapter->min_rx_queues) {
3434                 dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
3435                 goto tx_failed;
3436         }
3437
3438         /* Distribute the failed allocated queues*/
3439         for (i = 0; i < total_queues - registered_queues + more ; i++) {
3440                 netdev_dbg(adapter->netdev, "Reducing number of queues\n");
3441                 switch (i % 3) {
3442                 case 0:
3443                         if (adapter->req_rx_queues > adapter->min_rx_queues)
3444                                 adapter->req_rx_queues--;
3445                         else
3446                                 more++;
3447                         break;
3448                 case 1:
3449                         if (adapter->req_tx_queues > adapter->min_tx_queues)
3450                                 adapter->req_tx_queues--;
3451                         else
3452                                 more++;
3453                         break;
3454                 }
3455         }
3456
3457         adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
3458                                    sizeof(*adapter->tx_scrq), GFP_KERNEL);
3459         if (!adapter->tx_scrq)
3460                 goto tx_failed;
3461
3462         for (i = 0; i < adapter->req_tx_queues; i++) {
3463                 adapter->tx_scrq[i] = allqueues[i];
3464                 adapter->tx_scrq[i]->pool_index = i;
3465                 adapter->num_active_tx_scrqs++;
3466         }
3467
3468         adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
3469                                    sizeof(*adapter->rx_scrq), GFP_KERNEL);
3470         if (!adapter->rx_scrq)
3471                 goto rx_failed;
3472
3473         for (i = 0; i < adapter->req_rx_queues; i++) {
3474                 adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
3475                 adapter->rx_scrq[i]->scrq_num = i;
3476                 adapter->num_active_rx_scrqs++;
3477         }
3478
3479         kfree(allqueues);
3480         return 0;
3481
3482 rx_failed:
3483         kfree(adapter->tx_scrq);
3484         adapter->tx_scrq = NULL;
3485 tx_failed:
3486         for (i = 0; i < registered_queues; i++)
3487                 release_sub_crq_queue(adapter, allqueues[i], 1);
3488         kfree(allqueues);
3489         return -1;
3490 }
3491
3492 static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
3493 {
3494         struct device *dev = &adapter->vdev->dev;
3495         union ibmvnic_crq crq;
3496         int max_entries;
3497
3498         if (!retry) {
3499                 /* Sub-CRQ entries are 32 byte long */
3500                 int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
3501
3502                 if (adapter->min_tx_entries_per_subcrq > entries_page ||
3503                     adapter->min_rx_add_entries_per_subcrq > entries_page) {
3504                         dev_err(dev, "Fatal, invalid entries per sub-crq\n");
3505                         return;
3506                 }
3507
3508                 if (adapter->desired.mtu)
3509                         adapter->req_mtu = adapter->desired.mtu;
3510                 else
3511                         adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
3512
3513                 if (!adapter->desired.tx_entries)
3514                         adapter->desired.tx_entries =
3515                                         adapter->max_tx_entries_per_subcrq;
3516                 if (!adapter->desired.rx_entries)
3517                         adapter->desired.rx_entries =
3518                                         adapter->max_rx_add_entries_per_subcrq;
3519
3520                 max_entries = IBMVNIC_MAX_LTB_SIZE /
3521                               (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
3522
3523                 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
3524                         adapter->desired.tx_entries > IBMVNIC_MAX_LTB_SIZE) {
3525                         adapter->desired.tx_entries = max_entries;
3526                 }
3527
3528                 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
3529                         adapter->desired.rx_entries > IBMVNIC_MAX_LTB_SIZE) {
3530                         adapter->desired.rx_entries = max_entries;
3531                 }
3532
3533                 if (adapter->desired.tx_entries)
3534                         adapter->req_tx_entries_per_subcrq =
3535                                         adapter->desired.tx_entries;
3536                 else
3537                         adapter->req_tx_entries_per_subcrq =
3538                                         adapter->max_tx_entries_per_subcrq;
3539
3540                 if (adapter->desired.rx_entries)
3541                         adapter->req_rx_add_entries_per_subcrq =
3542                                         adapter->desired.rx_entries;
3543                 else
3544                         adapter->req_rx_add_entries_per_subcrq =
3545                                         adapter->max_rx_add_entries_per_subcrq;
3546
3547                 if (adapter->desired.tx_queues)
3548                         adapter->req_tx_queues =
3549                                         adapter->desired.tx_queues;
3550                 else
3551                         adapter->req_tx_queues =
3552                                         adapter->opt_tx_comp_sub_queues;
3553
3554                 if (adapter->desired.rx_queues)
3555                         adapter->req_rx_queues =
3556                                         adapter->desired.rx_queues;
3557                 else
3558                         adapter->req_rx_queues =
3559                                         adapter->opt_rx_comp_queues;
3560
3561                 adapter->req_rx_add_queues = adapter->max_rx_add_queues;
3562         }
3563
3564         memset(&crq, 0, sizeof(crq));
3565         crq.request_capability.first = IBMVNIC_CRQ_CMD;
3566         crq.request_capability.cmd = REQUEST_CAPABILITY;
3567
3568         crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
3569         crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
3570         atomic_inc(&adapter->running_cap_crqs);
3571         ibmvnic_send_crq(adapter, &crq);
3572
3573         crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
3574         crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
3575         atomic_inc(&adapter->running_cap_crqs);
3576         ibmvnic_send_crq(adapter, &crq);
3577
3578         crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
3579         crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
3580         atomic_inc(&adapter->running_cap_crqs);
3581         ibmvnic_send_crq(adapter, &crq);
3582
3583         crq.request_capability.capability =
3584             cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
3585         crq.request_capability.number =
3586             cpu_to_be64(adapter->req_tx_entries_per_subcrq);
3587         atomic_inc(&adapter->running_cap_crqs);
3588         ibmvnic_send_crq(adapter, &crq);
3589
3590         crq.request_capability.capability =
3591             cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
3592         crq.request_capability.number =
3593             cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
3594         atomic_inc(&adapter->running_cap_crqs);
3595         ibmvnic_send_crq(adapter, &crq);
3596
3597         crq.request_capability.capability = cpu_to_be16(REQ_MTU);
3598         crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
3599         atomic_inc(&adapter->running_cap_crqs);
3600         ibmvnic_send_crq(adapter, &crq);
3601
3602         if (adapter->netdev->flags & IFF_PROMISC) {
3603                 if (adapter->promisc_supported) {
3604                         crq.request_capability.capability =
3605                             cpu_to_be16(PROMISC_REQUESTED);
3606                         crq.request_capability.number = cpu_to_be64(1);
3607                         atomic_inc(&adapter->running_cap_crqs);
3608                         ibmvnic_send_crq(adapter, &crq);
3609                 }
3610         } else {
3611                 crq.request_capability.capability =
3612                     cpu_to_be16(PROMISC_REQUESTED);
3613                 crq.request_capability.number = cpu_to_be64(0);
3614                 atomic_inc(&adapter->running_cap_crqs);
3615                 ibmvnic_send_crq(adapter, &crq);
3616         }
3617 }
3618
3619 static int pending_scrq(struct ibmvnic_adapter *adapter,
3620                         struct ibmvnic_sub_crq_queue *scrq)
3621 {
3622         union sub_crq *entry = &scrq->msgs[scrq->cur];
3623         int rc;
3624
3625         rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
3626
3627         /* Ensure that the SCRQ valid flag is loaded prior to loading the
3628          * contents of the SCRQ descriptor
3629          */
3630         dma_rmb();
3631
3632         return rc;
3633 }
3634
3635 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
3636                                         struct ibmvnic_sub_crq_queue *scrq)
3637 {
3638         union sub_crq *entry;
3639         unsigned long flags;
3640
3641         spin_lock_irqsave(&scrq->lock, flags);
3642         entry = &scrq->msgs[scrq->cur];
3643         if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
3644                 if (++scrq->cur == scrq->size)
3645                         scrq->cur = 0;
3646         } else {
3647                 entry = NULL;
3648         }
3649         spin_unlock_irqrestore(&scrq->lock, flags);
3650
3651         /* Ensure that the SCRQ valid flag is loaded prior to loading the
3652          * contents of the SCRQ descriptor
3653          */
3654         dma_rmb();
3655
3656         return entry;
3657 }
3658
3659 static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
3660 {
3661         struct ibmvnic_crq_queue *queue = &adapter->crq;
3662         union ibmvnic_crq *crq;
3663
3664         crq = &queue->msgs[queue->cur];
3665         if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
3666                 if (++queue->cur == queue->size)
3667                         queue->cur = 0;
3668         } else {
3669                 crq = NULL;
3670         }
3671
3672         return crq;
3673 }
3674
3675 static void print_subcrq_error(struct device *dev, int rc, const char *func)
3676 {
3677         switch (rc) {
3678         case H_PARAMETER:
3679                 dev_warn_ratelimited(dev,
3680                                      "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
3681                                      func, rc);
3682                 break;
3683         case H_CLOSED:
3684                 dev_warn_ratelimited(dev,
3685                                      "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
3686                                      func, rc);
3687                 break;
3688         default:
3689                 dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
3690                 break;
3691         }
3692 }
3693
3694 static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
3695                                 u64 remote_handle, u64 ioba, u64 num_entries)
3696 {
3697         unsigned int ua = adapter->vdev->unit_address;
3698         struct device *dev = &adapter->vdev->dev;
3699         int rc;
3700
3701         /* Make sure the hypervisor sees the complete request */
3702         dma_wmb();
3703         rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
3704                                 cpu_to_be64(remote_handle),
3705                                 ioba, num_entries);
3706
3707         if (rc)
3708                 print_subcrq_error(dev, rc, __func__);
3709
3710         return rc;
3711 }
3712
3713 static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
3714                             union ibmvnic_crq *crq)
3715 {
3716         unsigned int ua = adapter->vdev->unit_address;
3717         struct device *dev = &adapter->vdev->dev;
3718         u64 *u64_crq = (u64 *)crq;
3719         int rc;
3720
3721         netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
3722                    (unsigned long)cpu_to_be64(u64_crq[0]),
3723                    (unsigned long)cpu_to_be64(u64_crq[1]));
3724
3725         if (!adapter->crq.active &&
3726             crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
3727                 dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
3728                 return -EINVAL;
3729         }
3730
3731         /* Make sure the hypervisor sees the complete request */
3732         dma_wmb();
3733
3734         rc = plpar_hcall_norets(H_SEND_CRQ, ua,
3735                                 cpu_to_be64(u64_crq[0]),
3736                                 cpu_to_be64(u64_crq[1]));
3737
3738         if (rc) {
3739                 if (rc == H_CLOSED) {
3740                         dev_warn(dev, "CRQ Queue closed\n");
3741                         /* do not reset, report the fail, wait for passive init from server */
3742                 }
3743
3744                 dev_warn(dev, "Send error (rc=%d)\n", rc);
3745         }
3746
3747         return rc;
3748 }
3749
3750 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
3751 {
3752         struct device *dev = &adapter->vdev->dev;
3753         union ibmvnic_crq crq;
3754         int retries = 100;
3755         int rc;
3756
3757         memset(&crq, 0, sizeof(crq));
3758         crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
3759         crq.generic.cmd = IBMVNIC_CRQ_INIT;
3760         netdev_dbg(adapter->netdev, "Sending CRQ init\n");
3761
3762         do {
3763                 rc = ibmvnic_send_crq(adapter, &crq);
3764                 if (rc != H_CLOSED)
3765                         break;
3766                 retries--;
3767                 msleep(50);
3768
3769         } while (retries > 0);
3770
3771         if (rc) {
3772                 dev_err(dev, "Failed to send init request, rc = %d\n", rc);
3773                 return rc;
3774         }
3775
3776         return 0;
3777 }
3778
3779 static int send_version_xchg(struct ibmvnic_adapter *adapter)
3780 {
3781         union ibmvnic_crq crq;
3782
3783         memset(&crq, 0, sizeof(crq));
3784         crq.version_exchange.first = IBMVNIC_CRQ_CMD;
3785         crq.version_exchange.cmd = VERSION_EXCHANGE;
3786         crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
3787
3788         return ibmvnic_send_crq(adapter, &crq);
3789 }
3790
3791 struct vnic_login_client_data {
3792         u8      type;
3793         __be16  len;
3794         char    name[];
3795 } __packed;
3796
3797 static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
3798 {
3799         int len;
3800
3801         /* Calculate the amount of buffer space needed for the
3802          * vnic client data in the login buffer. There are four entries,
3803          * OS name, LPAR name, device name, and a null last entry.
3804          */
3805         len = 4 * sizeof(struct vnic_login_client_data);
3806         len += 6; /* "Linux" plus NULL */
3807         len += strlen(utsname()->nodename) + 1;
3808         len += strlen(adapter->netdev->name) + 1;
3809
3810         return len;
3811 }
3812
3813 static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
3814                                  struct vnic_login_client_data *vlcd)
3815 {
3816         const char *os_name = "Linux";
3817         int len;
3818
3819         /* Type 1 - LPAR OS */
3820         vlcd->type = 1;
3821         len = strlen(os_name) + 1;
3822         vlcd->len = cpu_to_be16(len);
3823         strncpy(vlcd->name, os_name, len);
3824         vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
3825
3826         /* Type 2 - LPAR name */
3827         vlcd->type = 2;
3828         len = strlen(utsname()->nodename) + 1;
3829         vlcd->len = cpu_to_be16(len);
3830         strncpy(vlcd->name, utsname()->nodename, len);
3831         vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
3832
3833         /* Type 3 - device name */
3834         vlcd->type = 3;
3835         len = strlen(adapter->netdev->name) + 1;
3836         vlcd->len = cpu_to_be16(len);
3837         strncpy(vlcd->name, adapter->netdev->name, len);
3838 }
3839
3840 static int send_login(struct ibmvnic_adapter *adapter)
3841 {
3842         struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
3843         struct ibmvnic_login_buffer *login_buffer;
3844         struct device *dev = &adapter->vdev->dev;
3845         struct vnic_login_client_data *vlcd;
3846         dma_addr_t rsp_buffer_token;
3847         dma_addr_t buffer_token;
3848         size_t rsp_buffer_size;
3849         union ibmvnic_crq crq;
3850         int client_data_len;
3851         size_t buffer_size;
3852         __be64 *tx_list_p;
3853         __be64 *rx_list_p;
3854         int rc;
3855         int i;
3856
3857         if (!adapter->tx_scrq || !adapter->rx_scrq) {
3858                 netdev_err(adapter->netdev,
3859                            "RX or TX queues are not allocated, device login failed\n");
3860                 return -1;
3861         }
3862
3863         release_login_buffer(adapter);
3864         release_login_rsp_buffer(adapter);
3865
3866         client_data_len = vnic_client_data_len(adapter);
3867
3868         buffer_size =
3869             sizeof(struct ibmvnic_login_buffer) +
3870             sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
3871             client_data_len;
3872
3873         login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
3874         if (!login_buffer)
3875                 goto buf_alloc_failed;
3876
3877         buffer_token = dma_map_single(dev, login_buffer, buffer_size,
3878                                       DMA_TO_DEVICE);
3879         if (dma_mapping_error(dev, buffer_token)) {
3880                 dev_err(dev, "Couldn't map login buffer\n");
3881                 goto buf_map_failed;
3882         }
3883
3884         rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
3885                           sizeof(u64) * adapter->req_tx_queues +
3886                           sizeof(u64) * adapter->req_rx_queues +
3887                           sizeof(u64) * adapter->req_rx_queues +
3888                           sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
3889
3890         login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
3891         if (!login_rsp_buffer)
3892                 goto buf_rsp_alloc_failed;
3893
3894         rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
3895                                           rsp_buffer_size, DMA_FROM_DEVICE);
3896         if (dma_mapping_error(dev, rsp_buffer_token)) {
3897                 dev_err(dev, "Couldn't map login rsp buffer\n");
3898                 goto buf_rsp_map_failed;
3899         }
3900
3901         adapter->login_buf = login_buffer;
3902         adapter->login_buf_token = buffer_token;
3903         adapter->login_buf_sz = buffer_size;
3904         adapter->login_rsp_buf = login_rsp_buffer;
3905         adapter->login_rsp_buf_token = rsp_buffer_token;
3906         adapter->login_rsp_buf_sz = rsp_buffer_size;
3907
3908         login_buffer->len = cpu_to_be32(buffer_size);
3909         login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
3910         login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
3911         login_buffer->off_txcomp_subcrqs =
3912             cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
3913         login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
3914         login_buffer->off_rxcomp_subcrqs =
3915             cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
3916                         sizeof(u64) * adapter->req_tx_queues);
3917         login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
3918         login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
3919
3920         tx_list_p = (__be64 *)((char *)login_buffer +
3921                                       sizeof(struct ibmvnic_login_buffer));
3922         rx_list_p = (__be64 *)((char *)login_buffer +
3923                                       sizeof(struct ibmvnic_login_buffer) +
3924                                       sizeof(u64) * adapter->req_tx_queues);
3925
3926         for (i = 0; i < adapter->req_tx_queues; i++) {
3927                 if (adapter->tx_scrq[i]) {
3928                         tx_list_p[i] =
3929                                 cpu_to_be64(adapter->tx_scrq[i]->crq_num);
3930                 }
3931         }
3932
3933         for (i = 0; i < adapter->req_rx_queues; i++) {
3934                 if (adapter->rx_scrq[i]) {
3935                         rx_list_p[i] =
3936                                 cpu_to_be64(adapter->rx_scrq[i]->crq_num);
3937                 }
3938         }
3939
3940         /* Insert vNIC login client data */
3941         vlcd = (struct vnic_login_client_data *)
3942                 ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
3943         login_buffer->client_data_offset =
3944                         cpu_to_be32((char *)vlcd - (char *)login_buffer);
3945         login_buffer->client_data_len = cpu_to_be32(client_data_len);
3946
3947         vnic_add_client_data(adapter, vlcd);
3948
3949         netdev_dbg(adapter->netdev, "Login Buffer:\n");
3950         for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
3951                 netdev_dbg(adapter->netdev, "%016lx\n",
3952                            ((unsigned long *)(adapter->login_buf))[i]);
3953         }
3954
3955         memset(&crq, 0, sizeof(crq));
3956         crq.login.first = IBMVNIC_CRQ_CMD;
3957         crq.login.cmd = LOGIN;
3958         crq.login.ioba = cpu_to_be32(buffer_token);
3959         crq.login.len = cpu_to_be32(buffer_size);
3960
3961         adapter->login_pending = true;
3962         rc = ibmvnic_send_crq(adapter, &crq);
3963         if (rc) {
3964                 adapter->login_pending = false;
3965                 netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
3966                 goto buf_rsp_map_failed;
3967         }
3968
3969         return 0;
3970
3971 buf_rsp_map_failed:
3972         kfree(login_rsp_buffer);
3973         adapter->login_rsp_buf = NULL;
3974 buf_rsp_alloc_failed:
3975         dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
3976 buf_map_failed:
3977         kfree(login_buffer);
3978         adapter->login_buf = NULL;
3979 buf_alloc_failed:
3980         return -1;
3981 }
3982
3983 static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
3984                             u32 len, u8 map_id)
3985 {
3986         union ibmvnic_crq crq;
3987
3988         memset(&crq, 0, sizeof(crq));
3989         crq.request_map.first = IBMVNIC_CRQ_CMD;
3990         crq.request_map.cmd = REQUEST_MAP;
3991         crq.request_map.map_id = map_id;
3992         crq.request_map.ioba = cpu_to_be32(addr);
3993         crq.request_map.len = cpu_to_be32(len);
3994         return ibmvnic_send_crq(adapter, &crq);
3995 }
3996
3997 static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
3998 {
3999         union ibmvnic_crq crq;
4000
4001         memset(&crq, 0, sizeof(crq));
4002         crq.request_unmap.first = IBMVNIC_CRQ_CMD;
4003         crq.request_unmap.cmd = REQUEST_UNMAP;
4004         crq.request_unmap.map_id = map_id;
4005         return ibmvnic_send_crq(adapter, &crq);
4006 }
4007
4008 static void send_query_map(struct ibmvnic_adapter *adapter)
4009 {
4010         union ibmvnic_crq crq;
4011
4012         memset(&crq, 0, sizeof(crq));
4013         crq.query_map.first = IBMVNIC_CRQ_CMD;
4014         crq.query_map.cmd = QUERY_MAP;
4015         ibmvnic_send_crq(adapter, &crq);
4016 }
4017
4018 /* Send a series of CRQs requesting various capabilities of the VNIC server */
4019 static void send_query_cap(struct ibmvnic_adapter *adapter)
4020 {
4021         union ibmvnic_crq crq;
4022
4023         atomic_set(&adapter->running_cap_crqs, 0);
4024         memset(&crq, 0, sizeof(crq));
4025         crq.query_capability.first = IBMVNIC_CRQ_CMD;
4026         crq.query_capability.cmd = QUERY_CAPABILITY;
4027
4028         crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
4029         atomic_inc(&adapter->running_cap_crqs);
4030         ibmvnic_send_crq(adapter, &crq);
4031
4032         crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
4033         atomic_inc(&adapter->running_cap_crqs);
4034         ibmvnic_send_crq(adapter, &crq);
4035
4036         crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
4037         atomic_inc(&adapter->running_cap_crqs);
4038         ibmvnic_send_crq(adapter, &crq);
4039
4040         crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
4041         atomic_inc(&adapter->running_cap_crqs);
4042         ibmvnic_send_crq(adapter, &crq);
4043
4044         crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
4045         atomic_inc(&adapter->running_cap_crqs);
4046         ibmvnic_send_crq(adapter, &crq);
4047
4048         crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
4049         atomic_inc(&adapter->running_cap_crqs);
4050         ibmvnic_send_crq(adapter, &crq);
4051
4052         crq.query_capability.capability =
4053             cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
4054         atomic_inc(&adapter->running_cap_crqs);
4055         ibmvnic_send_crq(adapter, &crq);
4056
4057         crq.query_capability.capability =
4058             cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
4059         atomic_inc(&adapter->running_cap_crqs);
4060         ibmvnic_send_crq(adapter, &crq);
4061
4062         crq.query_capability.capability =
4063             cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
4064         atomic_inc(&adapter->running_cap_crqs);
4065         ibmvnic_send_crq(adapter, &crq);
4066
4067         crq.query_capability.capability =
4068             cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
4069         atomic_inc(&adapter->running_cap_crqs);
4070         ibmvnic_send_crq(adapter, &crq);
4071
4072         crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
4073         atomic_inc(&adapter->running_cap_crqs);
4074         ibmvnic_send_crq(adapter, &crq);
4075
4076         crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
4077         atomic_inc(&adapter->running_cap_crqs);
4078         ibmvnic_send_crq(adapter, &crq);
4079
4080         crq.query_capability.capability = cpu_to_be16(MIN_MTU);
4081         atomic_inc(&adapter->running_cap_crqs);
4082         ibmvnic_send_crq(adapter, &crq);
4083
4084         crq.query_capability.capability = cpu_to_be16(MAX_MTU);
4085         atomic_inc(&adapter->running_cap_crqs);
4086         ibmvnic_send_crq(adapter, &crq);
4087
4088         crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
4089         atomic_inc(&adapter->running_cap_crqs);
4090         ibmvnic_send_crq(adapter, &crq);
4091
4092         crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
4093         atomic_inc(&adapter->running_cap_crqs);
4094         ibmvnic_send_crq(adapter, &crq);
4095
4096         crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
4097         atomic_inc(&adapter->running_cap_crqs);
4098         ibmvnic_send_crq(adapter, &crq);
4099
4100         crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
4101         atomic_inc(&adapter->running_cap_crqs);
4102         ibmvnic_send_crq(adapter, &crq);
4103
4104         crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
4105         atomic_inc(&adapter->running_cap_crqs);
4106         ibmvnic_send_crq(adapter, &crq);
4107
4108         crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
4109         atomic_inc(&adapter->running_cap_crqs);
4110         ibmvnic_send_crq(adapter, &crq);
4111
4112         crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
4113         atomic_inc(&adapter->running_cap_crqs);
4114         ibmvnic_send_crq(adapter, &crq);
4115
4116         crq.query_capability.capability =
4117                         cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
4118         atomic_inc(&adapter->running_cap_crqs);
4119         ibmvnic_send_crq(adapter, &crq);
4120
4121         crq.query_capability.capability =
4122                         cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
4123         atomic_inc(&adapter->running_cap_crqs);
4124         ibmvnic_send_crq(adapter, &crq);
4125
4126         crq.query_capability.capability =
4127                         cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
4128         atomic_inc(&adapter->running_cap_crqs);
4129         ibmvnic_send_crq(adapter, &crq);
4130
4131         crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
4132         atomic_inc(&adapter->running_cap_crqs);
4133         ibmvnic_send_crq(adapter, &crq);
4134 }
4135
4136 static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
4137 {
4138         int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
4139         struct device *dev = &adapter->vdev->dev;
4140         union ibmvnic_crq crq;
4141
4142         adapter->ip_offload_tok =
4143                 dma_map_single(dev,
4144                                &adapter->ip_offload_buf,
4145                                buf_sz,
4146                                DMA_FROM_DEVICE);
4147
4148         if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
4149                 if (!firmware_has_feature(FW_FEATURE_CMO))
4150                         dev_err(dev, "Couldn't map offload buffer\n");
4151                 return;
4152         }
4153
4154         memset(&crq, 0, sizeof(crq));
4155         crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
4156         crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
4157         crq.query_ip_offload.len = cpu_to_be32(buf_sz);
4158         crq.query_ip_offload.ioba =
4159             cpu_to_be32(adapter->ip_offload_tok);
4160
4161         ibmvnic_send_crq(adapter, &crq);
4162 }
4163
4164 static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
4165 {
4166         struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
4167         struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
4168         struct device *dev = &adapter->vdev->dev;
4169         netdev_features_t old_hw_features = 0;
4170         union ibmvnic_crq crq;
4171
4172         adapter->ip_offload_ctrl_tok =
4173                 dma_map_single(dev,
4174                                ctrl_buf,
4175                                sizeof(adapter->ip_offload_ctrl),
4176                                DMA_TO_DEVICE);
4177
4178         if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
4179                 dev_err(dev, "Couldn't map ip offload control buffer\n");
4180                 return;
4181         }
4182
4183         ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
4184         ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
4185         ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
4186         ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
4187         ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
4188         ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
4189         ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
4190         ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
4191         ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
4192         ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
4193
4194         /* large_rx disabled for now, additional features needed */
4195         ctrl_buf->large_rx_ipv4 = 0;
4196         ctrl_buf->large_rx_ipv6 = 0;
4197
4198         if (adapter->state != VNIC_PROBING) {
4199                 old_hw_features = adapter->netdev->hw_features;
4200                 adapter->netdev->hw_features = 0;
4201         }
4202
4203         adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
4204
4205         if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
4206                 adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
4207
4208         if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
4209                 adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
4210
4211         if ((adapter->netdev->features &
4212             (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
4213                 adapter->netdev->hw_features |= NETIF_F_RXCSUM;
4214
4215         if (buf->large_tx_ipv4)
4216                 adapter->netdev->hw_features |= NETIF_F_TSO;
4217         if (buf->large_tx_ipv6)
4218                 adapter->netdev->hw_features |= NETIF_F_TSO6;
4219
4220         if (adapter->state == VNIC_PROBING) {
4221                 adapter->netdev->features |= adapter->netdev->hw_features;
4222         } else if (old_hw_features != adapter->netdev->hw_features) {
4223                 netdev_features_t tmp = 0;
4224
4225                 /* disable features no longer supported */
4226                 adapter->netdev->features &= adapter->netdev->hw_features;
4227                 /* turn on features now supported if previously enabled */
4228                 tmp = (old_hw_features ^ adapter->netdev->hw_features) &
4229                         adapter->netdev->hw_features;
4230                 adapter->netdev->features |=
4231                                 tmp & adapter->netdev->wanted_features;
4232         }
4233
4234         memset(&crq, 0, sizeof(crq));
4235         crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
4236         crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
4237         crq.control_ip_offload.len =
4238             cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
4239         crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
4240         ibmvnic_send_crq(adapter, &crq);
4241 }
4242
4243 static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
4244                                 struct ibmvnic_adapter *adapter)
4245 {
4246         struct device *dev = &adapter->vdev->dev;
4247
4248         if (crq->get_vpd_size_rsp.rc.code) {
4249                 dev_err(dev, "Error retrieving VPD size, rc=%x\n",
4250                         crq->get_vpd_size_rsp.rc.code);
4251                 complete(&adapter->fw_done);
4252                 return;
4253         }
4254
4255         adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
4256         complete(&adapter->fw_done);
4257 }
4258
4259 static void handle_vpd_rsp(union ibmvnic_crq *crq,
4260                            struct ibmvnic_adapter *adapter)
4261 {
4262         struct device *dev = &adapter->vdev->dev;
4263         unsigned char *substr = NULL;
4264         u8 fw_level_len = 0;
4265
4266         memset(adapter->fw_version, 0, 32);
4267
4268         dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
4269                          DMA_FROM_DEVICE);
4270
4271         if (crq->get_vpd_rsp.rc.code) {
4272                 dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
4273                         crq->get_vpd_rsp.rc.code);
4274                 goto complete;
4275         }
4276
4277         /* get the position of the firmware version info
4278          * located after the ASCII 'RM' substring in the buffer
4279          */
4280         substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
4281         if (!substr) {
4282                 dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
4283                 goto complete;
4284         }
4285
4286         /* get length of firmware level ASCII substring */
4287         if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
4288                 fw_level_len = *(substr + 2);
4289         } else {
4290                 dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
4291                 goto complete;
4292         }
4293
4294         /* copy firmware version string from vpd into adapter */
4295         if ((substr + 3 + fw_level_len) <
4296             (adapter->vpd->buff + adapter->vpd->len)) {
4297                 strncpy((char *)adapter->fw_version, substr + 3, fw_level_len);
4298         } else {
4299                 dev_info(dev, "FW substr extrapolated VPD buff\n");
4300         }
4301
4302 complete:
4303         if (adapter->fw_version[0] == '\0')
4304                 strncpy((char *)adapter->fw_version, "N/A", 3 * sizeof(char));
4305         complete(&adapter->fw_done);
4306 }
4307
4308 static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
4309 {
4310         struct device *dev = &adapter->vdev->dev;
4311         struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
4312         int i;
4313
4314         dma_unmap_single(dev, adapter->ip_offload_tok,
4315                          sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
4316
4317         netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
4318         for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
4319                 netdev_dbg(adapter->netdev, "%016lx\n",
4320                            ((unsigned long *)(buf))[i]);
4321
4322         netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
4323         netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
4324         netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
4325                    buf->tcp_ipv4_chksum);
4326         netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
4327                    buf->tcp_ipv6_chksum);
4328         netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
4329                    buf->udp_ipv4_chksum);
4330         netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
4331                    buf->udp_ipv6_chksum);
4332         netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
4333                    buf->large_tx_ipv4);
4334         netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
4335                    buf->large_tx_ipv6);
4336         netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
4337                    buf->large_rx_ipv4);
4338         netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
4339                    buf->large_rx_ipv6);
4340         netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
4341                    buf->max_ipv4_header_size);
4342         netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
4343                    buf->max_ipv6_header_size);
4344         netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
4345                    buf->max_tcp_header_size);
4346         netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
4347                    buf->max_udp_header_size);
4348         netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
4349                    buf->max_large_tx_size);
4350         netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
4351                    buf->max_large_rx_size);
4352         netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
4353                    buf->ipv6_extension_header);
4354         netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
4355                    buf->tcp_pseudosum_req);
4356         netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
4357                    buf->num_ipv6_ext_headers);
4358         netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
4359                    buf->off_ipv6_ext_headers);
4360
4361         send_control_ip_offload(adapter);
4362 }
4363
4364 static const char *ibmvnic_fw_err_cause(u16 cause)
4365 {
4366         switch (cause) {
4367         case ADAPTER_PROBLEM:
4368                 return "adapter problem";
4369         case BUS_PROBLEM:
4370                 return "bus problem";
4371         case FW_PROBLEM:
4372                 return "firmware problem";
4373         case DD_PROBLEM:
4374                 return "device driver problem";
4375         case EEH_RECOVERY:
4376                 return "EEH recovery";
4377         case FW_UPDATED:
4378                 return "firmware updated";
4379         case LOW_MEMORY:
4380                 return "low Memory";
4381         default:
4382                 return "unknown";
4383         }
4384 }
4385
4386 static void handle_error_indication(union ibmvnic_crq *crq,
4387                                     struct ibmvnic_adapter *adapter)
4388 {
4389         struct device *dev = &adapter->vdev->dev;
4390         u16 cause;
4391
4392         cause = be16_to_cpu(crq->error_indication.error_cause);
4393
4394         dev_warn_ratelimited(dev,
4395                              "Firmware reports %serror, cause: %s. Starting recovery...\n",
4396                              crq->error_indication.flags
4397                                 & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
4398                              ibmvnic_fw_err_cause(cause));
4399
4400         if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
4401                 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
4402         else
4403                 ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
4404 }
4405
4406 static int handle_change_mac_rsp(union ibmvnic_crq *crq,
4407                                  struct ibmvnic_adapter *adapter)
4408 {
4409         struct net_device *netdev = adapter->netdev;
4410         struct device *dev = &adapter->vdev->dev;
4411         long rc;
4412
4413         rc = crq->change_mac_addr_rsp.rc.code;
4414         if (rc) {
4415                 dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
4416                 goto out;
4417         }
4418         /* crq->change_mac_addr.mac_addr is the requested one
4419          * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
4420          */
4421         ether_addr_copy(netdev->dev_addr,
4422                         &crq->change_mac_addr_rsp.mac_addr[0]);
4423         ether_addr_copy(adapter->mac_addr,
4424                         &crq->change_mac_addr_rsp.mac_addr[0]);
4425 out:
4426         complete(&adapter->fw_done);
4427         return rc;
4428 }
4429
4430 static void handle_request_cap_rsp(union ibmvnic_crq *crq,
4431                                    struct ibmvnic_adapter *adapter)
4432 {
4433         struct device *dev = &adapter->vdev->dev;
4434         u64 *req_value;
4435         char *name;
4436
4437         atomic_dec(&adapter->running_cap_crqs);
4438         switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
4439         case REQ_TX_QUEUES:
4440                 req_value = &adapter->req_tx_queues;
4441                 name = "tx";
4442                 break;
4443         case REQ_RX_QUEUES:
4444                 req_value = &adapter->req_rx_queues;
4445                 name = "rx";
4446                 break;
4447         case REQ_RX_ADD_QUEUES:
4448                 req_value = &adapter->req_rx_add_queues;
4449                 name = "rx_add";
4450                 break;
4451         case REQ_TX_ENTRIES_PER_SUBCRQ:
4452                 req_value = &adapter->req_tx_entries_per_subcrq;
4453                 name = "tx_entries_per_subcrq";
4454                 break;
4455         case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
4456                 req_value = &adapter->req_rx_add_entries_per_subcrq;
4457                 name = "rx_add_entries_per_subcrq";
4458                 break;
4459         case REQ_MTU:
4460                 req_value = &adapter->req_mtu;
4461                 name = "mtu";
4462                 break;
4463         case PROMISC_REQUESTED:
4464                 req_value = &adapter->promisc;
4465                 name = "promisc";
4466                 break;
4467         default:
4468                 dev_err(dev, "Got invalid cap request rsp %d\n",
4469                         crq->request_capability.capability);
4470                 return;
4471         }
4472
4473         switch (crq->request_capability_rsp.rc.code) {
4474         case SUCCESS:
4475                 break;
4476         case PARTIALSUCCESS:
4477                 dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
4478                          *req_value,
4479                          (long)be64_to_cpu(crq->request_capability_rsp.number),
4480                          name);
4481
4482                 if (be16_to_cpu(crq->request_capability_rsp.capability) ==
4483                     REQ_MTU) {
4484                         pr_err("mtu of %llu is not supported. Reverting.\n",
4485                                *req_value);
4486                         *req_value = adapter->fallback.mtu;
4487                 } else {
4488                         *req_value =
4489                                 be64_to_cpu(crq->request_capability_rsp.number);
4490                 }
4491
4492                 send_request_cap(adapter, 1);
4493                 return;
4494         default:
4495                 dev_err(dev, "Error %d in request cap rsp\n",
4496                         crq->request_capability_rsp.rc.code);
4497                 return;
4498         }
4499
4500         /* Done receiving requested capabilities, query IP offload support */
4501         if (atomic_read(&adapter->running_cap_crqs) == 0) {
4502                 adapter->wait_capability = false;
4503                 send_query_ip_offload(adapter);
4504         }
4505 }
4506
4507 static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
4508                             struct ibmvnic_adapter *adapter)
4509 {
4510         struct device *dev = &adapter->vdev->dev;
4511         struct net_device *netdev = adapter->netdev;
4512         struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
4513         struct ibmvnic_login_buffer *login = adapter->login_buf;
4514         u64 *tx_handle_array;
4515         u64 *rx_handle_array;
4516         int num_tx_pools;
4517         int num_rx_pools;
4518         u64 *size_array;
4519         int i;
4520
4521         /* CHECK: Test/set of login_pending does not need to be atomic
4522          * because only ibmvnic_tasklet tests/clears this.
4523          */
4524         if (!adapter->login_pending) {
4525                 netdev_warn(netdev, "Ignoring unexpected login response\n");
4526                 return 0;
4527         }
4528         adapter->login_pending = false;
4529
4530         dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
4531                          DMA_TO_DEVICE);
4532         dma_unmap_single(dev, adapter->login_rsp_buf_token,
4533                          adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
4534
4535         /* If the number of queues requested can't be allocated by the
4536          * server, the login response will return with code 1. We will need
4537          * to resend the login buffer with fewer queues requested.
4538          */
4539         if (login_rsp_crq->generic.rc.code) {
4540                 adapter->init_done_rc = login_rsp_crq->generic.rc.code;
4541                 complete(&adapter->init_done);
4542                 return 0;
4543         }
4544
4545         netdev->mtu = adapter->req_mtu - ETH_HLEN;
4546
4547         netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
4548         for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
4549                 netdev_dbg(adapter->netdev, "%016lx\n",
4550                            ((unsigned long *)(adapter->login_rsp_buf))[i]);
4551         }
4552
4553         /* Sanity checks */
4554         if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
4555             (be32_to_cpu(login->num_rxcomp_subcrqs) *
4556              adapter->req_rx_add_queues !=
4557              be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
4558                 dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
4559                 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
4560                 return -EIO;
4561         }
4562         size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
4563                 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
4564         /* variable buffer sizes are not supported, so just read the
4565          * first entry.
4566          */
4567         adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
4568
4569         num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
4570         num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
4571
4572         tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
4573                                   be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
4574         rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
4575                                   be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
4576
4577         for (i = 0; i < num_tx_pools; i++)
4578                 adapter->tx_scrq[i]->handle = tx_handle_array[i];
4579
4580         for (i = 0; i < num_rx_pools; i++)
4581                 adapter->rx_scrq[i]->handle = rx_handle_array[i];
4582
4583         adapter->num_active_tx_scrqs = num_tx_pools;
4584         adapter->num_active_rx_scrqs = num_rx_pools;
4585         release_login_rsp_buffer(adapter);
4586         release_login_buffer(adapter);
4587         complete(&adapter->init_done);
4588
4589         return 0;
4590 }
4591
4592 static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
4593                                      struct ibmvnic_adapter *adapter)
4594 {
4595         struct device *dev = &adapter->vdev->dev;
4596         long rc;
4597
4598         rc = crq->request_unmap_rsp.rc.code;
4599         if (rc)
4600                 dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
4601 }
4602
4603 static void handle_query_map_rsp(union ibmvnic_crq *crq,
4604                                  struct ibmvnic_adapter *adapter)
4605 {
4606         struct net_device *netdev = adapter->netdev;
4607         struct device *dev = &adapter->vdev->dev;
4608         long rc;
4609
4610         rc = crq->query_map_rsp.rc.code;
4611         if (rc) {
4612                 dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
4613                 return;
4614         }
4615         netdev_dbg(netdev, "page_size = %d\ntot_pages = %d\nfree_pages = %d\n",
4616                    crq->query_map_rsp.page_size, crq->query_map_rsp.tot_pages,
4617                    crq->query_map_rsp.free_pages);
4618 }
4619
4620 static void handle_query_cap_rsp(union ibmvnic_crq *crq,
4621                                  struct ibmvnic_adapter *adapter)
4622 {
4623         struct net_device *netdev = adapter->netdev;
4624         struct device *dev = &adapter->vdev->dev;
4625         long rc;
4626
4627         atomic_dec(&adapter->running_cap_crqs);
4628         netdev_dbg(netdev, "Outstanding queries: %d\n",
4629                    atomic_read(&adapter->running_cap_crqs));
4630         rc = crq->query_capability.rc.code;
4631         if (rc) {
4632                 dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
4633                 goto out;
4634         }
4635
4636         switch (be16_to_cpu(crq->query_capability.capability)) {
4637         case MIN_TX_QUEUES:
4638                 adapter->min_tx_queues =
4639                     be64_to_cpu(crq->query_capability.number);
4640                 netdev_dbg(netdev, "min_tx_queues = %lld\n",
4641                            adapter->min_tx_queues);
4642                 break;
4643         case MIN_RX_QUEUES:
4644                 adapter->min_rx_queues =
4645                     be64_to_cpu(crq->query_capability.number);
4646                 netdev_dbg(netdev, "min_rx_queues = %lld\n",
4647                            adapter->min_rx_queues);
4648                 break;
4649         case MIN_RX_ADD_QUEUES:
4650                 adapter->min_rx_add_queues =
4651                     be64_to_cpu(crq->query_capability.number);
4652                 netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
4653                            adapter->min_rx_add_queues);
4654                 break;
4655         case MAX_TX_QUEUES:
4656                 adapter->max_tx_queues =
4657                     be64_to_cpu(crq->query_capability.number);
4658                 netdev_dbg(netdev, "max_tx_queues = %lld\n",
4659                            adapter->max_tx_queues);
4660                 break;
4661         case MAX_RX_QUEUES:
4662                 adapter->max_rx_queues =
4663                     be64_to_cpu(crq->query_capability.number);
4664                 netdev_dbg(netdev, "max_rx_queues = %lld\n",
4665                            adapter->max_rx_queues);
4666                 break;
4667         case MAX_RX_ADD_QUEUES:
4668                 adapter->max_rx_add_queues =
4669                     be64_to_cpu(crq->query_capability.number);
4670                 netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
4671                            adapter->max_rx_add_queues);
4672                 break;
4673         case MIN_TX_ENTRIES_PER_SUBCRQ:
4674                 adapter->min_tx_entries_per_subcrq =
4675                     be64_to_cpu(crq->query_capability.number);
4676                 netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
4677                            adapter->min_tx_entries_per_subcrq);
4678                 break;
4679         case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
4680                 adapter->min_rx_add_entries_per_subcrq =
4681                     be64_to_cpu(crq->query_capability.number);
4682                 netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
4683                            adapter->min_rx_add_entries_per_subcrq);
4684                 break;
4685         case MAX_TX_ENTRIES_PER_SUBCRQ:
4686                 adapter->max_tx_entries_per_subcrq =
4687                     be64_to_cpu(crq->query_capability.number);
4688                 netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
4689                            adapter->max_tx_entries_per_subcrq);
4690                 break;
4691         case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
4692                 adapter->max_rx_add_entries_per_subcrq =
4693                     be64_to_cpu(crq->query_capability.number);
4694                 netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
4695                            adapter->max_rx_add_entries_per_subcrq);
4696                 break;
4697         case TCP_IP_OFFLOAD:
4698                 adapter->tcp_ip_offload =
4699                     be64_to_cpu(crq->query_capability.number);
4700                 netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
4701                            adapter->tcp_ip_offload);
4702                 break;
4703         case PROMISC_SUPPORTED:
4704                 adapter->promisc_supported =
4705                     be64_to_cpu(crq->query_capability.number);
4706                 netdev_dbg(netdev, "promisc_supported = %lld\n",
4707                            adapter->promisc_supported);
4708                 break;
4709         case MIN_MTU:
4710                 adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
4711                 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
4712                 netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
4713                 break;
4714         case MAX_MTU:
4715                 adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
4716                 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
4717                 netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
4718                 break;
4719         case MAX_MULTICAST_FILTERS:
4720                 adapter->max_multicast_filters =
4721                     be64_to_cpu(crq->query_capability.number);
4722                 netdev_dbg(netdev, "max_multicast_filters = %lld\n",
4723                            adapter->max_multicast_filters);
4724                 break;
4725         case VLAN_HEADER_INSERTION:
4726                 adapter->vlan_header_insertion =
4727                     be64_to_cpu(crq->query_capability.number);
4728                 if (adapter->vlan_header_insertion)
4729                         netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
4730                 netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
4731                            adapter->vlan_header_insertion);
4732                 break;
4733         case RX_VLAN_HEADER_INSERTION:
4734                 adapter->rx_vlan_header_insertion =
4735                     be64_to_cpu(crq->query_capability.number);
4736                 netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
4737                            adapter->rx_vlan_header_insertion);
4738                 break;
4739         case MAX_TX_SG_ENTRIES:
4740                 adapter->max_tx_sg_entries =
4741                     be64_to_cpu(crq->query_capability.number);
4742                 netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
4743                            adapter->max_tx_sg_entries);
4744                 break;
4745         case RX_SG_SUPPORTED:
4746                 adapter->rx_sg_supported =
4747                     be64_to_cpu(crq->query_capability.number);
4748                 netdev_dbg(netdev, "rx_sg_supported = %lld\n",
4749                            adapter->rx_sg_supported);
4750                 break;
4751         case OPT_TX_COMP_SUB_QUEUES:
4752                 adapter->opt_tx_comp_sub_queues =
4753                     be64_to_cpu(crq->query_capability.number);
4754                 netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
4755                            adapter->opt_tx_comp_sub_queues);
4756                 break;
4757         case OPT_RX_COMP_QUEUES:
4758                 adapter->opt_rx_comp_queues =
4759                     be64_to_cpu(crq->query_capability.number);
4760                 netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
4761                            adapter->opt_rx_comp_queues);
4762                 break;
4763         case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
4764                 adapter->opt_rx_bufadd_q_per_rx_comp_q =
4765                     be64_to_cpu(crq->query_capability.number);
4766                 netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
4767                            adapter->opt_rx_bufadd_q_per_rx_comp_q);
4768                 break;
4769         case OPT_TX_ENTRIES_PER_SUBCRQ:
4770                 adapter->opt_tx_entries_per_subcrq =
4771                     be64_to_cpu(crq->query_capability.number);
4772                 netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
4773                            adapter->opt_tx_entries_per_subcrq);
4774                 break;
4775         case OPT_RXBA_ENTRIES_PER_SUBCRQ:
4776                 adapter->opt_rxba_entries_per_subcrq =
4777                     be64_to_cpu(crq->query_capability.number);
4778                 netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
4779                            adapter->opt_rxba_entries_per_subcrq);
4780                 break;
4781         case TX_RX_DESC_REQ:
4782                 adapter->tx_rx_desc_req = crq->query_capability.number;
4783                 netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
4784                            adapter->tx_rx_desc_req);
4785                 break;
4786
4787         default:
4788                 netdev_err(netdev, "Got invalid cap rsp %d\n",
4789                            crq->query_capability.capability);
4790         }
4791
4792 out:
4793         if (atomic_read(&adapter->running_cap_crqs) == 0) {
4794                 adapter->wait_capability = false;
4795                 send_request_cap(adapter, 0);
4796         }
4797 }
4798
4799 static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
4800 {
4801         union ibmvnic_crq crq;
4802         int rc;
4803
4804         memset(&crq, 0, sizeof(crq));
4805         crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
4806         crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
4807
4808         mutex_lock(&adapter->fw_lock);
4809         adapter->fw_done_rc = 0;
4810         reinit_completion(&adapter->fw_done);
4811
4812         rc = ibmvnic_send_crq(adapter, &crq);
4813         if (rc) {
4814                 mutex_unlock(&adapter->fw_lock);
4815                 return rc;
4816         }
4817
4818         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
4819         if (rc) {
4820                 mutex_unlock(&adapter->fw_lock);
4821                 return rc;
4822         }
4823
4824         mutex_unlock(&adapter->fw_lock);
4825         return adapter->fw_done_rc ? -EIO : 0;
4826 }
4827
4828 static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
4829                                        struct ibmvnic_adapter *adapter)
4830 {
4831         struct net_device *netdev = adapter->netdev;
4832         int rc;
4833         __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
4834
4835         rc = crq->query_phys_parms_rsp.rc.code;
4836         if (rc) {
4837                 netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
4838                 return rc;
4839         }
4840         switch (rspeed) {
4841         case IBMVNIC_10MBPS:
4842                 adapter->speed = SPEED_10;
4843                 break;
4844         case IBMVNIC_100MBPS:
4845                 adapter->speed = SPEED_100;
4846                 break;
4847         case IBMVNIC_1GBPS:
4848                 adapter->speed = SPEED_1000;
4849                 break;
4850         case IBMVNIC_10GBPS:
4851                 adapter->speed = SPEED_10000;
4852                 break;
4853         case IBMVNIC_25GBPS:
4854                 adapter->speed = SPEED_25000;
4855                 break;
4856         case IBMVNIC_40GBPS:
4857                 adapter->speed = SPEED_40000;
4858                 break;
4859         case IBMVNIC_50GBPS:
4860                 adapter->speed = SPEED_50000;
4861                 break;
4862         case IBMVNIC_100GBPS:
4863                 adapter->speed = SPEED_100000;
4864                 break;
4865         case IBMVNIC_200GBPS:
4866                 adapter->speed = SPEED_200000;
4867                 break;
4868         default:
4869                 if (netif_carrier_ok(netdev))
4870                         netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
4871                 adapter->speed = SPEED_UNKNOWN;
4872         }
4873         if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
4874                 adapter->duplex = DUPLEX_FULL;
4875         else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
4876                 adapter->duplex = DUPLEX_HALF;
4877         else
4878                 adapter->duplex = DUPLEX_UNKNOWN;
4879
4880         return rc;
4881 }
4882
4883 static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
4884                                struct ibmvnic_adapter *adapter)
4885 {
4886         struct ibmvnic_generic_crq *gen_crq = &crq->generic;
4887         struct net_device *netdev = adapter->netdev;
4888         struct device *dev = &adapter->vdev->dev;
4889         u64 *u64_crq = (u64 *)crq;
4890         long rc;
4891
4892         netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
4893                    (unsigned long)cpu_to_be64(u64_crq[0]),
4894                    (unsigned long)cpu_to_be64(u64_crq[1]));
4895         switch (gen_crq->first) {
4896         case IBMVNIC_CRQ_INIT_RSP:
4897                 switch (gen_crq->cmd) {
4898                 case IBMVNIC_CRQ_INIT:
4899                         dev_info(dev, "Partner initialized\n");
4900                         adapter->from_passive_init = true;
4901                         /* Discard any stale login responses from prev reset.
4902                          * CHECK: should we clear even on INIT_COMPLETE?
4903                          */
4904                         adapter->login_pending = false;
4905
4906                         if (!completion_done(&adapter->init_done)) {
4907                                 complete(&adapter->init_done);
4908                                 adapter->init_done_rc = -EIO;
4909                         }
4910                         rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
4911                         if (rc && rc != -EBUSY) {
4912                                 /* We were unable to schedule the failover
4913                                  * reset either because the adapter was still
4914                                  * probing (eg: during kexec) or we could not
4915                                  * allocate memory. Clear the failover_pending
4916                                  * flag since no one else will. We ignore
4917                                  * EBUSY because it means either FAILOVER reset
4918                                  * is already scheduled or the adapter is
4919                                  * being removed.
4920                                  */
4921                                 netdev_err(netdev,
4922                                            "Error %ld scheduling failover reset\n",
4923                                            rc);
4924                                 adapter->failover_pending = false;
4925                         }
4926                         break;
4927                 case IBMVNIC_CRQ_INIT_COMPLETE:
4928                         dev_info(dev, "Partner initialization complete\n");
4929                         adapter->crq.active = true;
4930                         send_version_xchg(adapter);
4931                         break;
4932                 default:
4933                         dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
4934                 }
4935                 return;
4936         case IBMVNIC_CRQ_XPORT_EVENT:
4937                 netif_carrier_off(netdev);
4938                 adapter->crq.active = false;
4939                 /* terminate any thread waiting for a response
4940                  * from the device
4941                  */
4942                 if (!completion_done(&adapter->fw_done)) {
4943                         adapter->fw_done_rc = -EIO;
4944                         complete(&adapter->fw_done);
4945                 }
4946                 if (!completion_done(&adapter->stats_done))
4947                         complete(&adapter->stats_done);
4948                 if (test_bit(0, &adapter->resetting))
4949                         adapter->force_reset_recovery = true;
4950                 if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
4951                         dev_info(dev, "Migrated, re-enabling adapter\n");
4952                         ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
4953                 } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
4954                         dev_info(dev, "Backing device failover detected\n");
4955                         adapter->failover_pending = true;
4956                 } else {
4957                         /* The adapter lost the connection */
4958                         dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
4959                                 gen_crq->cmd);
4960                         ibmvnic_reset(adapter, VNIC_RESET_FATAL);
4961                 }
4962                 return;
4963         case IBMVNIC_CRQ_CMD_RSP:
4964                 break;
4965         default:
4966                 dev_err(dev, "Got an invalid msg type 0x%02x\n",
4967                         gen_crq->first);
4968                 return;
4969         }
4970
4971         switch (gen_crq->cmd) {
4972         case VERSION_EXCHANGE_RSP:
4973                 rc = crq->version_exchange_rsp.rc.code;
4974                 if (rc) {
4975                         dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
4976                         break;
4977                 }
4978                 ibmvnic_version =
4979                             be16_to_cpu(crq->version_exchange_rsp.version);
4980                 dev_info(dev, "Partner protocol version is %d\n",
4981                          ibmvnic_version);
4982                 send_query_cap(adapter);
4983                 break;
4984         case QUERY_CAPABILITY_RSP:
4985                 handle_query_cap_rsp(crq, adapter);
4986                 break;
4987         case QUERY_MAP_RSP:
4988                 handle_query_map_rsp(crq, adapter);
4989                 break;
4990         case REQUEST_MAP_RSP:
4991                 adapter->fw_done_rc = crq->request_map_rsp.rc.code;
4992                 complete(&adapter->fw_done);
4993                 break;
4994         case REQUEST_UNMAP_RSP:
4995                 handle_request_unmap_rsp(crq, adapter);
4996                 break;
4997         case REQUEST_CAPABILITY_RSP:
4998                 handle_request_cap_rsp(crq, adapter);
4999                 break;
5000         case LOGIN_RSP:
5001                 netdev_dbg(netdev, "Got Login Response\n");
5002                 handle_login_rsp(crq, adapter);
5003                 break;
5004         case LOGICAL_LINK_STATE_RSP:
5005                 netdev_dbg(netdev,
5006                            "Got Logical Link State Response, state: %d rc: %d\n",
5007                            crq->logical_link_state_rsp.link_state,
5008                            crq->logical_link_state_rsp.rc.code);
5009                 adapter->logical_link_state =
5010                     crq->logical_link_state_rsp.link_state;
5011                 adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
5012                 complete(&adapter->init_done);
5013                 break;
5014         case LINK_STATE_INDICATION:
5015                 netdev_dbg(netdev, "Got Logical Link State Indication\n");
5016                 adapter->phys_link_state =
5017                     crq->link_state_indication.phys_link_state;
5018                 adapter->logical_link_state =
5019                     crq->link_state_indication.logical_link_state;
5020                 if (adapter->phys_link_state && adapter->logical_link_state)
5021                         netif_carrier_on(netdev);
5022                 else
5023                         netif_carrier_off(netdev);
5024                 break;
5025         case CHANGE_MAC_ADDR_RSP:
5026                 netdev_dbg(netdev, "Got MAC address change Response\n");
5027                 adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
5028                 break;
5029         case ERROR_INDICATION:
5030                 netdev_dbg(netdev, "Got Error Indication\n");
5031                 handle_error_indication(crq, adapter);
5032                 break;
5033         case REQUEST_STATISTICS_RSP:
5034                 netdev_dbg(netdev, "Got Statistics Response\n");
5035                 complete(&adapter->stats_done);
5036                 break;
5037         case QUERY_IP_OFFLOAD_RSP:
5038                 netdev_dbg(netdev, "Got Query IP offload Response\n");
5039                 handle_query_ip_offload_rsp(adapter);
5040                 break;
5041         case MULTICAST_CTRL_RSP:
5042                 netdev_dbg(netdev, "Got multicast control Response\n");
5043                 break;
5044         case CONTROL_IP_OFFLOAD_RSP:
5045                 netdev_dbg(netdev, "Got Control IP offload Response\n");
5046                 dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
5047                                  sizeof(adapter->ip_offload_ctrl),
5048                                  DMA_TO_DEVICE);
5049                 complete(&adapter->init_done);
5050                 break;
5051         case COLLECT_FW_TRACE_RSP:
5052                 netdev_dbg(netdev, "Got Collect firmware trace Response\n");
5053                 complete(&adapter->fw_done);
5054                 break;
5055         case GET_VPD_SIZE_RSP:
5056                 handle_vpd_size_rsp(crq, adapter);
5057                 break;
5058         case GET_VPD_RSP:
5059                 handle_vpd_rsp(crq, adapter);
5060                 break;
5061         case QUERY_PHYS_PARMS_RSP:
5062                 adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
5063                 complete(&adapter->fw_done);
5064                 break;
5065         default:
5066                 netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
5067                            gen_crq->cmd);
5068         }
5069 }
5070
5071 static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
5072 {
5073         struct ibmvnic_adapter *adapter = instance;
5074
5075         tasklet_schedule(&adapter->tasklet);
5076         return IRQ_HANDLED;
5077 }
5078
5079 static void ibmvnic_tasklet(struct tasklet_struct *t)
5080 {
5081         struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
5082         struct ibmvnic_crq_queue *queue = &adapter->crq;
5083         union ibmvnic_crq *crq;
5084         unsigned long flags;
5085         bool done = false;
5086
5087         spin_lock_irqsave(&queue->lock, flags);
5088         while (!done) {
5089                 /* Pull all the valid messages off the CRQ */
5090                 while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
5091                         /* This barrier makes sure ibmvnic_next_crq()'s
5092                          * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
5093                          * before ibmvnic_handle_crq()'s
5094                          * switch(gen_crq->first) and switch(gen_crq->cmd).
5095                          */
5096                         dma_rmb();
5097                         ibmvnic_handle_crq(crq, adapter);
5098                         crq->generic.first = 0;
5099                 }
5100
5101                 /* remain in tasklet until all
5102                  * capabilities responses are received
5103                  */
5104                 if (!adapter->wait_capability)
5105                         done = true;
5106         }
5107         /* if capabilities CRQ's were sent in this tasklet, the following
5108          * tasklet must wait until all responses are received
5109          */
5110         if (atomic_read(&adapter->running_cap_crqs) != 0)
5111                 adapter->wait_capability = true;
5112         spin_unlock_irqrestore(&queue->lock, flags);
5113 }
5114
5115 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
5116 {
5117         struct vio_dev *vdev = adapter->vdev;
5118         int rc;
5119
5120         do {
5121                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
5122         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
5123
5124         if (rc)
5125                 dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
5126
5127         return rc;
5128 }
5129
5130 static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
5131 {
5132         struct ibmvnic_crq_queue *crq = &adapter->crq;
5133         struct device *dev = &adapter->vdev->dev;
5134         struct vio_dev *vdev = adapter->vdev;
5135         int rc;
5136
5137         /* Close the CRQ */
5138         do {
5139                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5140         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5141
5142         /* Clean out the queue */
5143         if (!crq->msgs)
5144                 return -EINVAL;
5145
5146         memset(crq->msgs, 0, PAGE_SIZE);
5147         crq->cur = 0;
5148         crq->active = false;
5149
5150         /* And re-open it again */
5151         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5152                                 crq->msg_token, PAGE_SIZE);
5153
5154         if (rc == H_CLOSED)
5155                 /* Adapter is good, but other end is not ready */
5156                 dev_warn(dev, "Partner adapter not ready\n");
5157         else if (rc != 0)
5158                 dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
5159
5160         return rc;
5161 }
5162
5163 static void release_crq_queue(struct ibmvnic_adapter *adapter)
5164 {
5165         struct ibmvnic_crq_queue *crq = &adapter->crq;
5166         struct vio_dev *vdev = adapter->vdev;
5167         long rc;
5168
5169         if (!crq->msgs)
5170                 return;
5171
5172         netdev_dbg(adapter->netdev, "Releasing CRQ\n");
5173         free_irq(vdev->irq, adapter);
5174         tasklet_kill(&adapter->tasklet);
5175         do {
5176                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5177         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5178
5179         dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
5180                          DMA_BIDIRECTIONAL);
5181         free_page((unsigned long)crq->msgs);
5182         crq->msgs = NULL;
5183         crq->active = false;
5184 }
5185
5186 static int init_crq_queue(struct ibmvnic_adapter *adapter)
5187 {
5188         struct ibmvnic_crq_queue *crq = &adapter->crq;
5189         struct device *dev = &adapter->vdev->dev;
5190         struct vio_dev *vdev = adapter->vdev;
5191         int rc, retrc = -ENOMEM;
5192
5193         if (crq->msgs)
5194                 return 0;
5195
5196         crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
5197         /* Should we allocate more than one page? */
5198
5199         if (!crq->msgs)
5200                 return -ENOMEM;
5201
5202         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
5203         crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
5204                                         DMA_BIDIRECTIONAL);
5205         if (dma_mapping_error(dev, crq->msg_token))
5206                 goto map_failed;
5207
5208         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5209                                 crq->msg_token, PAGE_SIZE);
5210
5211         if (rc == H_RESOURCE)
5212                 /* maybe kexecing and resource is busy. try a reset */
5213                 rc = ibmvnic_reset_crq(adapter);
5214         retrc = rc;
5215
5216         if (rc == H_CLOSED) {
5217                 dev_warn(dev, "Partner adapter not ready\n");
5218         } else if (rc) {
5219                 dev_warn(dev, "Error %d opening adapter\n", rc);
5220                 goto reg_crq_failed;
5221         }
5222
5223         retrc = 0;
5224
5225         tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
5226
5227         netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
5228         snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
5229                  adapter->vdev->unit_address);
5230         rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
5231         if (rc) {
5232                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
5233                         vdev->irq, rc);
5234                 goto req_irq_failed;
5235         }
5236
5237         rc = vio_enable_interrupts(vdev);
5238         if (rc) {
5239                 dev_err(dev, "Error %d enabling interrupts\n", rc);
5240                 goto req_irq_failed;
5241         }
5242
5243         crq->cur = 0;
5244         spin_lock_init(&crq->lock);
5245
5246         return retrc;
5247
5248 req_irq_failed:
5249         tasklet_kill(&adapter->tasklet);
5250         do {
5251                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5252         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5253 reg_crq_failed:
5254         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
5255 map_failed:
5256         free_page((unsigned long)crq->msgs);
5257         crq->msgs = NULL;
5258         return retrc;
5259 }
5260
5261 static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
5262 {
5263         struct device *dev = &adapter->vdev->dev;
5264         unsigned long timeout = msecs_to_jiffies(20000);
5265         u64 old_num_rx_queues = adapter->req_rx_queues;
5266         u64 old_num_tx_queues = adapter->req_tx_queues;
5267         int rc;
5268
5269         adapter->from_passive_init = false;
5270
5271         if (reset)
5272                 reinit_completion(&adapter->init_done);
5273
5274         adapter->init_done_rc = 0;
5275         rc = ibmvnic_send_crq_init(adapter);
5276         if (rc) {
5277                 dev_err(dev, "Send crq init failed with error %d\n", rc);
5278                 return rc;
5279         }
5280
5281         if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
5282                 dev_err(dev, "Initialization sequence timed out\n");
5283                 return -1;
5284         }
5285
5286         if (adapter->init_done_rc) {
5287                 release_crq_queue(adapter);
5288                 return adapter->init_done_rc;
5289         }
5290
5291         if (adapter->from_passive_init) {
5292                 adapter->state = VNIC_OPEN;
5293                 adapter->from_passive_init = false;
5294                 return -1;
5295         }
5296
5297         if (reset &&
5298             test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
5299             adapter->reset_reason != VNIC_RESET_MOBILITY) {
5300                 if (adapter->req_rx_queues != old_num_rx_queues ||
5301                     adapter->req_tx_queues != old_num_tx_queues) {
5302                         release_sub_crqs(adapter, 0);
5303                         rc = init_sub_crqs(adapter);
5304                 } else {
5305                         rc = reset_sub_crq_queues(adapter);
5306                 }
5307         } else {
5308                 rc = init_sub_crqs(adapter);
5309         }
5310
5311         if (rc) {
5312                 dev_err(dev, "Initialization of sub crqs failed\n");
5313                 release_crq_queue(adapter);
5314                 return rc;
5315         }
5316
5317         rc = init_sub_crq_irqs(adapter);
5318         if (rc) {
5319                 dev_err(dev, "Failed to initialize sub crq irqs\n");
5320                 release_crq_queue(adapter);
5321         }
5322
5323         return rc;
5324 }
5325
5326 static struct device_attribute dev_attr_failover;
5327
5328 static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
5329 {
5330         struct ibmvnic_adapter *adapter;
5331         struct net_device *netdev;
5332         unsigned char *mac_addr_p;
5333         int rc;
5334
5335         dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
5336                 dev->unit_address);
5337
5338         mac_addr_p = (unsigned char *)vio_get_attribute(dev,
5339                                                         VETH_MAC_ADDR, NULL);
5340         if (!mac_addr_p) {
5341                 dev_err(&dev->dev,
5342                         "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
5343                         __FILE__, __LINE__);
5344                 return 0;
5345         }
5346
5347         netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
5348                                    IBMVNIC_MAX_QUEUES);
5349         if (!netdev)
5350                 return -ENOMEM;
5351
5352         adapter = netdev_priv(netdev);
5353         adapter->state = VNIC_PROBING;
5354         dev_set_drvdata(&dev->dev, netdev);
5355         adapter->vdev = dev;
5356         adapter->netdev = netdev;
5357         adapter->login_pending = false;
5358
5359         ether_addr_copy(adapter->mac_addr, mac_addr_p);
5360         ether_addr_copy(netdev->dev_addr, adapter->mac_addr);
5361         netdev->irq = dev->irq;
5362         netdev->netdev_ops = &ibmvnic_netdev_ops;
5363         netdev->ethtool_ops = &ibmvnic_ethtool_ops;
5364         SET_NETDEV_DEV(netdev, &dev->dev);
5365
5366         INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
5367         INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
5368                           __ibmvnic_delayed_reset);
5369         INIT_LIST_HEAD(&adapter->rwi_list);
5370         spin_lock_init(&adapter->rwi_lock);
5371         spin_lock_init(&adapter->state_lock);
5372         mutex_init(&adapter->fw_lock);
5373         init_completion(&adapter->init_done);
5374         init_completion(&adapter->fw_done);
5375         init_completion(&adapter->reset_done);
5376         init_completion(&adapter->stats_done);
5377         clear_bit(0, &adapter->resetting);
5378
5379         do {
5380                 rc = init_crq_queue(adapter);
5381                 if (rc) {
5382                         dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
5383                                 rc);
5384                         goto ibmvnic_init_fail;
5385                 }
5386
5387                 rc = ibmvnic_reset_init(adapter, false);
5388                 if (rc && rc != EAGAIN)
5389                         goto ibmvnic_init_fail;
5390         } while (rc == EAGAIN);
5391
5392         rc = init_stats_buffers(adapter);
5393         if (rc)
5394                 goto ibmvnic_init_fail;
5395
5396         rc = init_stats_token(adapter);
5397         if (rc)
5398                 goto ibmvnic_stats_fail;
5399
5400         netdev->mtu = adapter->req_mtu - ETH_HLEN;
5401         netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
5402         netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
5403
5404         rc = device_create_file(&dev->dev, &dev_attr_failover);
5405         if (rc)
5406                 goto ibmvnic_dev_file_err;
5407
5408         netif_carrier_off(netdev);
5409         rc = register_netdev(netdev);
5410         if (rc) {
5411                 dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
5412                 goto ibmvnic_register_fail;
5413         }
5414         dev_info(&dev->dev, "ibmvnic registered\n");
5415
5416         adapter->state = VNIC_PROBED;
5417
5418         adapter->wait_for_reset = false;
5419         adapter->last_reset_time = jiffies;
5420         return 0;
5421
5422 ibmvnic_register_fail:
5423         device_remove_file(&dev->dev, &dev_attr_failover);
5424
5425 ibmvnic_dev_file_err:
5426         release_stats_token(adapter);
5427
5428 ibmvnic_stats_fail:
5429         release_stats_buffers(adapter);
5430
5431 ibmvnic_init_fail:
5432         release_sub_crqs(adapter, 1);
5433         release_crq_queue(adapter);
5434         mutex_destroy(&adapter->fw_lock);
5435         free_netdev(netdev);
5436
5437         return rc;
5438 }
5439
5440 static void ibmvnic_remove(struct vio_dev *dev)
5441 {
5442         struct net_device *netdev = dev_get_drvdata(&dev->dev);
5443         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
5444         unsigned long flags;
5445
5446         spin_lock_irqsave(&adapter->state_lock, flags);
5447
5448         /* If ibmvnic_reset() is scheduling a reset, wait for it to
5449          * finish. Then, set the state to REMOVING to prevent it from
5450          * scheduling any more work and to have reset functions ignore
5451          * any resets that have already been scheduled. Drop the lock
5452          * after setting state, so __ibmvnic_reset() which is called
5453          * from the flush_work() below, can make progress.
5454          */
5455         spin_lock(&adapter->rwi_lock);
5456         adapter->state = VNIC_REMOVING;
5457         spin_unlock(&adapter->rwi_lock);
5458
5459         spin_unlock_irqrestore(&adapter->state_lock, flags);
5460
5461         flush_work(&adapter->ibmvnic_reset);
5462         flush_delayed_work(&adapter->ibmvnic_delayed_reset);
5463
5464         rtnl_lock();
5465         unregister_netdevice(netdev);
5466
5467         release_resources(adapter);
5468         release_sub_crqs(adapter, 1);
5469         release_crq_queue(adapter);
5470
5471         release_stats_token(adapter);
5472         release_stats_buffers(adapter);
5473
5474         adapter->state = VNIC_REMOVED;
5475
5476         rtnl_unlock();
5477         mutex_destroy(&adapter->fw_lock);
5478         device_remove_file(&dev->dev, &dev_attr_failover);
5479         free_netdev(netdev);
5480         dev_set_drvdata(&dev->dev, NULL);
5481 }
5482
5483 static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
5484                               const char *buf, size_t count)
5485 {
5486         struct net_device *netdev = dev_get_drvdata(dev);
5487         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
5488         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
5489         __be64 session_token;
5490         long rc;
5491
5492         if (!sysfs_streq(buf, "1"))
5493                 return -EINVAL;
5494
5495         rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
5496                          H_GET_SESSION_TOKEN, 0, 0, 0);
5497         if (rc) {
5498                 netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
5499                            rc);
5500                 goto last_resort;
5501         }
5502
5503         session_token = (__be64)retbuf[0];
5504         netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
5505                    be64_to_cpu(session_token));
5506         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
5507                                 H_SESSION_ERR_DETECTED, session_token, 0, 0);
5508         if (rc)
5509                 netdev_err(netdev,
5510                            "H_VIOCTL initiated failover failed, rc %ld\n",
5511                            rc);
5512
5513 last_resort:
5514         netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
5515         ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
5516
5517         return count;
5518 }
5519 static DEVICE_ATTR_WO(failover);
5520
5521 static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
5522 {
5523         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
5524         struct ibmvnic_adapter *adapter;
5525         struct iommu_table *tbl;
5526         unsigned long ret = 0;
5527         int i;
5528
5529         tbl = get_iommu_table_base(&vdev->dev);
5530
5531         /* netdev inits at probe time along with the structures we need below*/
5532         if (!netdev)
5533                 return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
5534
5535         adapter = netdev_priv(netdev);
5536
5537         ret += PAGE_SIZE; /* the crq message queue */
5538         ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
5539
5540         for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
5541                 ret += 4 * PAGE_SIZE; /* the scrq message queue */
5542
5543         for (i = 0; i < adapter->num_active_rx_pools; i++)
5544                 ret += adapter->rx_pool[i].size *
5545                     IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
5546
5547         return ret;
5548 }
5549
5550 static int ibmvnic_resume(struct device *dev)
5551 {
5552         struct net_device *netdev = dev_get_drvdata(dev);
5553         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
5554
5555         if (adapter->state != VNIC_OPEN)
5556                 return 0;
5557
5558         tasklet_schedule(&adapter->tasklet);
5559
5560         return 0;
5561 }
5562
5563 static const struct vio_device_id ibmvnic_device_table[] = {
5564         {"network", "IBM,vnic"},
5565         {"", "" }
5566 };
5567 MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
5568
5569 static const struct dev_pm_ops ibmvnic_pm_ops = {
5570         .resume = ibmvnic_resume
5571 };
5572
5573 static struct vio_driver ibmvnic_driver = {
5574         .id_table       = ibmvnic_device_table,
5575         .probe          = ibmvnic_probe,
5576         .remove         = ibmvnic_remove,
5577         .get_desired_dma = ibmvnic_get_desired_dma,
5578         .name           = ibmvnic_driver_name,
5579         .pm             = &ibmvnic_pm_ops,
5580 };
5581
5582 /* module functions */
5583 static int __init ibmvnic_module_init(void)
5584 {
5585         pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
5586                 IBMVNIC_DRIVER_VERSION);
5587
5588         return vio_register_driver(&ibmvnic_driver);
5589 }
5590
5591 static void __exit ibmvnic_module_exit(void)
5592 {
5593         vio_unregister_driver(&ibmvnic_driver);
5594 }
5595
5596 module_init(ibmvnic_module_init);
5597 module_exit(ibmvnic_module_exit);