drivers/net/ethernet/ibm/ibmveth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * IBM Power Virtual Ethernet Device Driver
   4  *
   5  * Copyright (C) IBM Corporation, 2003, 2010
   6  *
   7  * Authors: Dave Larson <larson1@us.ibm.com>
   8  *          Santiago Leon <santil@linux.vnet.ibm.com>
   9  *          Brian King <brking@linux.vnet.ibm.com>
  10  *          Robert Jennings <rcj@linux.vnet.ibm.com>
  11  *          Anton Blanchard <anton@au.ibm.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/errno.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/kernel.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/mm.h>
  25 #include <linux/pm.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/in.h>
  28 #include <linux/ip.h>
  29 #include <linux/ipv6.h>
  30 #include <linux/slab.h>
  31 #include <asm/hvcall.h>
  32 #include <linux/atomic.h>
  33 #include <asm/vio.h>
  34 #include <asm/iommu.h>
  35 #include <asm/firmware.h>
  36 #include <net/tcp.h>
  37 #include <net/ip6_checksum.h>
  38
  39 #include "ibmveth.h"
  40
  41 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  42 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  43 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  44
  45 static struct kobj_type ktype_veth_pool;
  46
  47
  48 static const char ibmveth_driver_name[] = "ibmveth";
  49 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  50 #define ibmveth_driver_version "1.06"
  51
  52 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  53 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  54 MODULE_LICENSE("GPL");
  55 MODULE_VERSION(ibmveth_driver_version);
  56
  57 static unsigned int tx_copybreak __read_mostly = 128;
  58 module_param(tx_copybreak, uint, 0644);
  59 MODULE_PARM_DESC(tx_copybreak,
  60         "Maximum size of packet that is copied to a new buffer on transmit");
  61
  62 static unsigned int rx_copybreak __read_mostly = 128;
  63 module_param(rx_copybreak, uint, 0644);
  64 MODULE_PARM_DESC(rx_copybreak,
  65         "Maximum size of packet that is copied to a new buffer on receive");
  66
  67 static unsigned int rx_flush __read_mostly = 0;
  68 module_param(rx_flush, uint, 0644);
  69 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  70
  71 static bool old_large_send __read_mostly;
  72 module_param(old_large_send, bool, 0444);
  73 MODULE_PARM_DESC(old_large_send,
  74         "Use old large send method on firmware that supports the new method");
  75
  76 struct ibmveth_stat {
  77         char name[ETH_GSTRING_LEN];
  78         int offset;
  79 };
  80
  81 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  82 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  83
  84 static struct ibmveth_stat ibmveth_stats[] = {
  85         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  86         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
  87         { "replenish_add_buff_failure",
  88                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
  89         { "replenish_add_buff_success",
  90                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
  91         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
  92         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
  93         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
  94         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
  95         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
  96         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
  97         { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
  98         { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
  99         { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
 100 };
 101
 102 /* simple methods of getting data from the current rxq entry */
 103 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 104 {
 105         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
 106 }
 107
 108 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 109 {
 110         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 111                         IBMVETH_RXQ_TOGGLE_SHIFT;
 112 }
 113
 114 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 115 {
 116         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 117 }
 118
 119 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 120 {
 121         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 122 }
 123
 124 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 125 {
 126         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 127 }
 128
 129 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
 130 {
 131         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
 132 }
 133
 134 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 135 {
 136         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 137 }
 138
 139 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 140 {
 141         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 142 }
 143
 144 static unsigned int ibmveth_real_max_tx_queues(void)
 145 {
 146         unsigned int n_cpu = num_online_cpus();
 147
 148         return min(n_cpu, IBMVETH_MAX_QUEUES);
 149 }
 150
 151 /* setup the initial settings for a buffer pool */
 152 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 153                                      u32 pool_index, u32 pool_size,
 154                                      u32 buff_size, u32 pool_active)
 155 {
 156         pool->size = pool_size;
 157         pool->index = pool_index;
 158         pool->buff_size = buff_size;
 159         pool->threshold = pool_size * 7 / 8;
 160         pool->active = pool_active;
 161 }
 162
 163 /* allocate and setup an buffer pool - called during open */
 164 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 165 {
 166         int i;
 167
 168         pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
 169
 170         if (!pool->free_map)
 171                 return -1;
 172
 173         pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
 174         if (!pool->dma_addr) {
 175                 kfree(pool->free_map);
 176                 pool->free_map = NULL;
 177                 return -1;
 178         }
 179
 180         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 181
 182         if (!pool->skbuff) {
 183                 kfree(pool->dma_addr);
 184                 pool->dma_addr = NULL;
 185
 186                 kfree(pool->free_map);
 187                 pool->free_map = NULL;
 188                 return -1;
 189         }
 190
 191         for (i = 0; i < pool->size; ++i)
 192                 pool->free_map[i] = i;
 193
 194         atomic_set(&pool->available, 0);
 195         pool->producer_index = 0;
 196         pool->consumer_index = 0;
 197
 198         return 0;
 199 }
 200
 201 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
 202 {
 203         unsigned long offset;
 204
 205         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
 206                 asm("dcbf %0,%1,1" :: "b" (addr), "r" (offset));
 207 }
 208
 209 /* replenish the buffers for a pool.  note that we don't need to
 210  * skb_reserve these since they are used for incoming...
 211  */
 212 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
 213                                           struct ibmveth_buff_pool *pool)
 214 {
 215         u32 i;
 216         u32 count = pool->size - atomic_read(&pool->available);
 217         u32 buffers_added = 0;
 218         struct sk_buff *skb;
 219         unsigned int free_index, index;
 220         u64 correlator;
 221         unsigned long lpar_rc;
 222         dma_addr_t dma_addr;
 223
 224         mb();
 225
 226         for (i = 0; i < count; ++i) {
 227                 union ibmveth_buf_desc desc;
 228
 229                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 230
 231                 if (!skb) {
 232                         netdev_dbg(adapter->netdev,
 233                                    "replenish: unable to allocate skb\n");
 234                         adapter->replenish_no_mem++;
 235                         break;
 236                 }
 237
 238                 free_index = pool->consumer_index;
 239                 pool->consumer_index++;
 240                 if (pool->consumer_index >= pool->size)
 241                         pool->consumer_index = 0;
 242                 index = pool->free_map[free_index];
 243
 244                 BUG_ON(index == IBM_VETH_INVALID_MAP);
 245                 BUG_ON(pool->skbuff[index] != NULL);
 246
 247                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 248                                 pool->buff_size, DMA_FROM_DEVICE);
 249
 250                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 251                         goto failure;
 252
 253                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 254                 pool->dma_addr[index] = dma_addr;
 255                 pool->skbuff[index] = skb;
 256
 257                 correlator = ((u64)pool->index << 32) | index;
 258                 *(u64 *)skb->data = correlator;
 259
 260                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 261                 desc.fields.address = dma_addr;
 262
 263                 if (rx_flush) {
 264                         unsigned int len = min(pool->buff_size,
 265                                                 adapter->netdev->mtu +
 266                                                 IBMVETH_BUFF_OH);
 267                         ibmveth_flush_buffer(skb->data, len);
 268                 }
 269                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
 270                                                    desc.desc);
 271
 272                 if (lpar_rc != H_SUCCESS) {
 273                         goto failure;
 274                 } else {
 275                         buffers_added++;
 276                         adapter->replenish_add_buff_success++;
 277                 }
 278         }
 279
 280         mb();
 281         atomic_add(buffers_added, &(pool->available));
 282         return;
 283
 284 failure:
 285         pool->free_map[free_index] = index;
 286         pool->skbuff[index] = NULL;
 287         if (pool->consumer_index == 0)
 288                 pool->consumer_index = pool->size - 1;
 289         else
 290                 pool->consumer_index--;
 291         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 292                 dma_unmap_single(&adapter->vdev->dev,
 293                                  pool->dma_addr[index], pool->buff_size,
 294                                  DMA_FROM_DEVICE);
 295         dev_kfree_skb_any(skb);
 296         adapter->replenish_add_buff_failure++;
 297
 298         mb();
 299         atomic_add(buffers_added, &(pool->available));
 300 }
 301
 302 /*
 303  * The final 8 bytes of the buffer list is a counter of frames dropped
 304  * because there was not a buffer in the buffer list capable of holding
 305  * the frame.
 306  */
 307 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
 308 {
 309         __be64 *p = adapter->buffer_list_addr + 4096 - 8;
 310
 311         adapter->rx_no_buffer = be64_to_cpup(p);
 312 }
 313
 314 /* replenish routine */
 315 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 316 {
 317         int i;
 318
 319         adapter->replenish_task_cycles++;
 320
 321         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 322                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 323
 324                 if (pool->active &&
 325                     (atomic_read(&pool->available) < pool->threshold))
 326                         ibmveth_replenish_buffer_pool(adapter, pool);
 327         }
 328
 329         ibmveth_update_rx_no_buffer(adapter);
 330 }
 331
 332 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 333 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 334                                      struct ibmveth_buff_pool *pool)
 335 {
 336         int i;
 337
 338         kfree(pool->free_map);
 339         pool->free_map = NULL;
 340
 341         if (pool->skbuff && pool->dma_addr) {
 342                 for (i = 0; i < pool->size; ++i) {
 343                         struct sk_buff *skb = pool->skbuff[i];
 344                         if (skb) {
 345                                 dma_unmap_single(&adapter->vdev->dev,
 346                                                  pool->dma_addr[i],
 347                                                  pool->buff_size,
 348                                                  DMA_FROM_DEVICE);
 349                                 dev_kfree_skb_any(skb);
 350                                 pool->skbuff[i] = NULL;
 351                         }
 352                 }
 353         }
 354
 355         if (pool->dma_addr) {
 356                 kfree(pool->dma_addr);
 357                 pool->dma_addr = NULL;
 358         }
 359
 360         if (pool->skbuff) {
 361                 kfree(pool->skbuff);
 362                 pool->skbuff = NULL;
 363         }
 364 }
 365
 366 /* remove a buffer from a pool */
 367 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 368                                             u64 correlator)
 369 {
 370         unsigned int pool  = correlator >> 32;
 371         unsigned int index = correlator & 0xffffffffUL;
 372         unsigned int free_index;
 373         struct sk_buff *skb;
 374
 375         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 376         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 377
 378         skb = adapter->rx_buff_pool[pool].skbuff[index];
 379
 380         BUG_ON(skb == NULL);
 381
 382         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 383
 384         dma_unmap_single(&adapter->vdev->dev,
 385                          adapter->rx_buff_pool[pool].dma_addr[index],
 386                          adapter->rx_buff_pool[pool].buff_size,
 387                          DMA_FROM_DEVICE);
 388
 389         free_index = adapter->rx_buff_pool[pool].producer_index;
 390         adapter->rx_buff_pool[pool].producer_index++;
 391         if (adapter->rx_buff_pool[pool].producer_index >=
 392             adapter->rx_buff_pool[pool].size)
 393                 adapter->rx_buff_pool[pool].producer_index = 0;
 394         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 395
 396         mb();
 397
 398         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 399 }
 400
 401 /* get the current buffer on the rx queue */
 402 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 403 {
 404         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 405         unsigned int pool = correlator >> 32;
 406         unsigned int index = correlator & 0xffffffffUL;
 407
 408         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 409         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 410
 411         return adapter->rx_buff_pool[pool].skbuff[index];
 412 }
 413
 414 /* recycle the current buffer on the rx queue */
 415 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 416 {
 417         u32 q_index = adapter->rx_queue.index;
 418         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 419         unsigned int pool = correlator >> 32;
 420         unsigned int index = correlator & 0xffffffffUL;
 421         union ibmveth_buf_desc desc;
 422         unsigned long lpar_rc;
 423         int ret = 1;
 424
 425         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 426         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 427
 428         if (!adapter->rx_buff_pool[pool].active) {
 429                 ibmveth_rxq_harvest_buffer(adapter);
 430                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 431                 goto out;
 432         }
 433
 434         desc.fields.flags_len = IBMVETH_BUF_VALID |
 435                 adapter->rx_buff_pool[pool].buff_size;
 436         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 437
 438         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 439
 440         if (lpar_rc != H_SUCCESS) {
 441                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 442                            "during recycle rc=%ld", lpar_rc);
 443                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 444                 ret = 0;
 445         }
 446
 447         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 448                 adapter->rx_queue.index = 0;
 449                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 450         }
 451
 452 out:
 453         return ret;
 454 }
 455
 456 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 457 {
 458         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 459
 460         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 461                 adapter->rx_queue.index = 0;
 462                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 463         }
 464 }
 465
 466 static void ibmveth_free_tx_ltb(struct ibmveth_adapter *adapter, int idx)
 467 {
 468         dma_unmap_single(&adapter->vdev->dev, adapter->tx_ltb_dma[idx],
 469                          adapter->tx_ltb_size, DMA_TO_DEVICE);
 470         kfree(adapter->tx_ltb_ptr[idx]);
 471         adapter->tx_ltb_ptr[idx] = NULL;
 472 }
 473
 474 static int ibmveth_allocate_tx_ltb(struct ibmveth_adapter *adapter, int idx)
 475 {
 476         adapter->tx_ltb_ptr[idx] = kzalloc(adapter->tx_ltb_size,
 477                                            GFP_KERNEL);
 478         if (!adapter->tx_ltb_ptr[idx]) {
 479                 netdev_err(adapter->netdev,
 480                            "unable to allocate tx long term buffer\n");
 481                 return -ENOMEM;
 482         }
 483         adapter->tx_ltb_dma[idx] = dma_map_single(&adapter->vdev->dev,
 484                                                   adapter->tx_ltb_ptr[idx],
 485                                                   adapter->tx_ltb_size,
 486                                                   DMA_TO_DEVICE);
 487         if (dma_mapping_error(&adapter->vdev->dev, adapter->tx_ltb_dma[idx])) {
 488                 netdev_err(adapter->netdev,
 489                            "unable to DMA map tx long term buffer\n");
 490                 kfree(adapter->tx_ltb_ptr[idx]);
 491                 adapter->tx_ltb_ptr[idx] = NULL;
 492                 return -ENOMEM;
 493         }
 494
 495         return 0;
 496 }
 497
 498 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 499         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 500 {
 501         int rc, try_again = 1;
 502
 503         /*
 504          * After a kexec the adapter will still be open, so our attempt to
 505          * open it will fail. So if we get a failure we free the adapter and
 506          * try again, but only once.
 507          */
 508 retry:
 509         rc = h_register_logical_lan(adapter->vdev->unit_address,
 510                                     adapter->buffer_list_dma, rxq_desc.desc,
 511                                     adapter->filter_list_dma, mac_address);
 512
 513         if (rc != H_SUCCESS && try_again) {
 514                 do {
 515                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 516                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 517
 518                 try_again = 0;
 519                 goto retry;
 520         }
 521
 522         return rc;
 523 }
 524
 525 static int ibmveth_open(struct net_device *netdev)
 526 {
 527         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 528         u64 mac_address;
 529         int rxq_entries = 1;
 530         unsigned long lpar_rc;
 531         int rc;
 532         union ibmveth_buf_desc rxq_desc;
 533         int i;
 534         struct device *dev;
 535
 536         netdev_dbg(netdev, "open starting\n");
 537
 538         napi_enable(&adapter->napi);
 539
 540         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 541                 rxq_entries += adapter->rx_buff_pool[i].size;
 542
 543         rc = -ENOMEM;
 544         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 545         if (!adapter->buffer_list_addr) {
 546                 netdev_err(netdev, "unable to allocate list pages\n");
 547                 goto out;
 548         }
 549
 550         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 551         if (!adapter->filter_list_addr) {
 552                 netdev_err(netdev, "unable to allocate filter pages\n");
 553                 goto out_free_buffer_list;
 554         }
 555
 556         dev = &adapter->vdev->dev;
 557
 558         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 559                                                 rxq_entries;
 560         adapter->rx_queue.queue_addr =
 561                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 562                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 563         if (!adapter->rx_queue.queue_addr)
 564                 goto out_free_filter_list;
 565
 566         adapter->buffer_list_dma = dma_map_single(dev,
 567                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 568         if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
 569                 netdev_err(netdev, "unable to map buffer list pages\n");
 570                 goto out_free_queue_mem;
 571         }
 572
 573         adapter->filter_list_dma = dma_map_single(dev,
 574                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 575         if (dma_mapping_error(dev, adapter->filter_list_dma)) {
 576                 netdev_err(netdev, "unable to map filter list pages\n");
 577                 goto out_unmap_buffer_list;
 578         }
 579
 580         for (i = 0; i < netdev->real_num_tx_queues; i++) {
 581                 if (ibmveth_allocate_tx_ltb(adapter, i))
 582                         goto out_free_tx_ltb;
 583         }
 584
 585         adapter->rx_queue.index = 0;
 586         adapter->rx_queue.num_slots = rxq_entries;
 587         adapter->rx_queue.toggle = 1;
 588
 589         mac_address = ether_addr_to_u64(netdev->dev_addr);
 590
 591         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 592                                         adapter->rx_queue.queue_len;
 593         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 594
 595         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 596         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 597         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 598
 599         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 600
 601         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 602
 603         if (lpar_rc != H_SUCCESS) {
 604                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 605                            lpar_rc);
 606                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 607                            "desc:0x%llx MAC:0x%llx\n",
 608                                      adapter->buffer_list_dma,
 609                                      adapter->filter_list_dma,
 610                                      rxq_desc.desc,
 611                                      mac_address);
 612                 rc = -ENONET;
 613                 goto out_unmap_filter_list;
 614         }
 615
 616         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 617                 if (!adapter->rx_buff_pool[i].active)
 618                         continue;
 619                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 620                         netdev_err(netdev, "unable to alloc pool\n");
 621                         adapter->rx_buff_pool[i].active = 0;
 622                         rc = -ENOMEM;
 623                         goto out_free_buffer_pools;
 624                 }
 625         }
 626
 627         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 628         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 629                          netdev);
 630         if (rc != 0) {
 631                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 632                            netdev->irq, rc);
 633                 do {
 634                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 635                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 636
 637                 goto out_free_buffer_pools;
 638         }
 639
 640         rc = -ENOMEM;
 641
 642         netdev_dbg(netdev, "initial replenish cycle\n");
 643         ibmveth_interrupt(netdev->irq, netdev);
 644
 645         netif_tx_start_all_queues(netdev);
 646
 647         netdev_dbg(netdev, "open complete\n");
 648
 649         return 0;
 650
 651 out_free_buffer_pools:
 652         while (--i >= 0) {
 653                 if (adapter->rx_buff_pool[i].active)
 654                         ibmveth_free_buffer_pool(adapter,
 655                                                  &adapter->rx_buff_pool[i]);
 656         }
 657 out_unmap_filter_list:
 658         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 659                          DMA_BIDIRECTIONAL);
 660
 661 out_free_tx_ltb:
 662         while (--i >= 0) {
 663                 ibmveth_free_tx_ltb(adapter, i);
 664         }
 665
 666 out_unmap_buffer_list:
 667         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 668                          DMA_BIDIRECTIONAL);
 669 out_free_queue_mem:
 670         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 671                           adapter->rx_queue.queue_addr,
 672                           adapter->rx_queue.queue_dma);
 673 out_free_filter_list:
 674         free_page((unsigned long)adapter->filter_list_addr);
 675 out_free_buffer_list:
 676         free_page((unsigned long)adapter->buffer_list_addr);
 677 out:
 678         napi_disable(&adapter->napi);
 679         return rc;
 680 }
 681
 682 static int ibmveth_close(struct net_device *netdev)
 683 {
 684         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 685         struct device *dev = &adapter->vdev->dev;
 686         long lpar_rc;
 687         int i;
 688
 689         netdev_dbg(netdev, "close starting\n");
 690
 691         napi_disable(&adapter->napi);
 692
 693         netif_tx_stop_all_queues(netdev);
 694
 695         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 696
 697         do {
 698                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 699         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 700
 701         if (lpar_rc != H_SUCCESS) {
 702                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 703                            "continuing with close\n", lpar_rc);
 704         }
 705
 706         free_irq(netdev->irq, netdev);
 707
 708         ibmveth_update_rx_no_buffer(adapter);
 709
 710         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 711                          DMA_BIDIRECTIONAL);
 712         free_page((unsigned long)adapter->buffer_list_addr);
 713
 714         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 715                          DMA_BIDIRECTIONAL);
 716         free_page((unsigned long)adapter->filter_list_addr);
 717
 718         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 719                           adapter->rx_queue.queue_addr,
 720                           adapter->rx_queue.queue_dma);
 721
 722         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 723                 if (adapter->rx_buff_pool[i].active)
 724                         ibmveth_free_buffer_pool(adapter,
 725                                                  &adapter->rx_buff_pool[i]);
 726
 727         for (i = 0; i < netdev->real_num_tx_queues; i++)
 728                 ibmveth_free_tx_ltb(adapter, i);
 729
 730         netdev_dbg(netdev, "close complete\n");
 731
 732         return 0;
 733 }
 734
 735 static int ibmveth_set_link_ksettings(struct net_device *dev,
 736                                       const struct ethtool_link_ksettings *cmd)
 737 {
 738         struct ibmveth_adapter *adapter = netdev_priv(dev);
 739
 740         return ethtool_virtdev_set_link_ksettings(dev, cmd,
 741                                                   &adapter->speed,
 742                                                   &adapter->duplex);
 743 }
 744
 745 static int ibmveth_get_link_ksettings(struct net_device *dev,
 746                                       struct ethtool_link_ksettings *cmd)
 747 {
 748         struct ibmveth_adapter *adapter = netdev_priv(dev);
 749
 750         cmd->base.speed = adapter->speed;
 751         cmd->base.duplex = adapter->duplex;
 752         cmd->base.port = PORT_OTHER;
 753
 754         return 0;
 755 }
 756
 757 static void ibmveth_init_link_settings(struct net_device *dev)
 758 {
 759         struct ibmveth_adapter *adapter = netdev_priv(dev);
 760
 761         adapter->speed = SPEED_1000;
 762         adapter->duplex = DUPLEX_FULL;
 763 }
 764
 765 static void netdev_get_drvinfo(struct net_device *dev,
 766                                struct ethtool_drvinfo *info)
 767 {
 768         strscpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 769         strscpy(info->version, ibmveth_driver_version, sizeof(info->version));
 770 }
 771
 772 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 773         netdev_features_t features)
 774 {
 775         /*
 776          * Since the ibmveth firmware interface does not have the
 777          * concept of separate tx/rx checksum offload enable, if rx
 778          * checksum is disabled we also have to disable tx checksum
 779          * offload. Once we disable rx checksum offload, we are no
 780          * longer allowed to send tx buffers that are not properly
 781          * checksummed.
 782          */
 783
 784         if (!(features & NETIF_F_RXCSUM))
 785                 features &= ~NETIF_F_CSUM_MASK;
 786
 787         return features;
 788 }
 789
 790 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 791 {
 792         struct ibmveth_adapter *adapter = netdev_priv(dev);
 793         unsigned long set_attr, clr_attr, ret_attr;
 794         unsigned long set_attr6, clr_attr6;
 795         long ret, ret4, ret6;
 796         int rc1 = 0, rc2 = 0;
 797         int restart = 0;
 798
 799         if (netif_running(dev)) {
 800                 restart = 1;
 801                 ibmveth_close(dev);
 802         }
 803
 804         set_attr = 0;
 805         clr_attr = 0;
 806         set_attr6 = 0;
 807         clr_attr6 = 0;
 808
 809         if (data) {
 810                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 811                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 812         } else {
 813                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 814                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 815         }
 816
 817         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 818
 819         if (ret == H_SUCCESS &&
 820             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 821                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 822                                          set_attr, &ret_attr);
 823
 824                 if (ret4 != H_SUCCESS) {
 825                         netdev_err(dev, "unable to change IPv4 checksum "
 826                                         "offload settings. %d rc=%ld\n",
 827                                         data, ret4);
 828
 829                         h_illan_attributes(adapter->vdev->unit_address,
 830                                            set_attr, clr_attr, &ret_attr);
 831
 832                         if (data == 1)
 833                                 dev->features &= ~NETIF_F_IP_CSUM;
 834
 835                 } else {
 836                         adapter->fw_ipv4_csum_support = data;
 837                 }
 838
 839                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 840                                          clr_attr6, set_attr6, &ret_attr);
 841
 842                 if (ret6 != H_SUCCESS) {
 843                         netdev_err(dev, "unable to change IPv6 checksum "
 844                                         "offload settings. %d rc=%ld\n",
 845                                         data, ret6);
 846
 847                         h_illan_attributes(adapter->vdev->unit_address,
 848                                            set_attr6, clr_attr6, &ret_attr);
 849
 850                         if (data == 1)
 851                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 852
 853                 } else
 854                         adapter->fw_ipv6_csum_support = data;
 855
 856                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 857                         adapter->rx_csum = data;
 858                 else
 859                         rc1 = -EIO;
 860         } else {
 861                 rc1 = -EIO;
 862                 netdev_err(dev, "unable to change checksum offload settings."
 863                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 864                                      ret_attr);
 865         }
 866
 867         if (restart)
 868                 rc2 = ibmveth_open(dev);
 869
 870         return rc1 ? rc1 : rc2;
 871 }
 872
 873 static int ibmveth_set_tso(struct net_device *dev, u32 data)
 874 {
 875         struct ibmveth_adapter *adapter = netdev_priv(dev);
 876         unsigned long set_attr, clr_attr, ret_attr;
 877         long ret1, ret2;
 878         int rc1 = 0, rc2 = 0;
 879         int restart = 0;
 880
 881         if (netif_running(dev)) {
 882                 restart = 1;
 883                 ibmveth_close(dev);
 884         }
 885
 886         set_attr = 0;
 887         clr_attr = 0;
 888
 889         if (data)
 890                 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 891         else
 892                 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 893
 894         ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 895
 896         if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
 897             !old_large_send) {
 898                 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 899                                           set_attr, &ret_attr);
 900
 901                 if (ret2 != H_SUCCESS) {
 902                         netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
 903                                    data, ret2);
 904
 905                         h_illan_attributes(adapter->vdev->unit_address,
 906                                            set_attr, clr_attr, &ret_attr);
 907
 908                         if (data == 1)
 909                                 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 910                         rc1 = -EIO;
 911
 912                 } else {
 913                         adapter->fw_large_send_support = data;
 914                         adapter->large_send = data;
 915                 }
 916         } else {
 917                 /* Older firmware version of large send offload does not
 918                  * support tcp6/ipv6
 919                  */
 920                 if (data == 1) {
 921                         dev->features &= ~NETIF_F_TSO6;
 922                         netdev_info(dev, "TSO feature requires all partitions to have updated driver");
 923                 }
 924                 adapter->large_send = data;
 925         }
 926
 927         if (restart)
 928                 rc2 = ibmveth_open(dev);
 929
 930         return rc1 ? rc1 : rc2;
 931 }
 932
 933 static int ibmveth_set_features(struct net_device *dev,
 934         netdev_features_t features)
 935 {
 936         struct ibmveth_adapter *adapter = netdev_priv(dev);
 937         int rx_csum = !!(features & NETIF_F_RXCSUM);
 938         int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
 939         int rc1 = 0, rc2 = 0;
 940
 941         if (rx_csum != adapter->rx_csum) {
 942                 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
 943                 if (rc1 && !adapter->rx_csum)
 944                         dev->features =
 945                                 features & ~(NETIF_F_CSUM_MASK |
 946                                              NETIF_F_RXCSUM);
 947         }
 948
 949         if (large_send != adapter->large_send) {
 950                 rc2 = ibmveth_set_tso(dev, large_send);
 951                 if (rc2 && !adapter->large_send)
 952                         dev->features =
 953                                 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
 954         }
 955
 956         return rc1 ? rc1 : rc2;
 957 }
 958
 959 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 960 {
 961         int i;
 962
 963         if (stringset != ETH_SS_STATS)
 964                 return;
 965
 966         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 967                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 968 }
 969
 970 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 971 {
 972         switch (sset) {
 973         case ETH_SS_STATS:
 974                 return ARRAY_SIZE(ibmveth_stats);
 975         default:
 976                 return -EOPNOTSUPP;
 977         }
 978 }
 979
 980 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 981                                       struct ethtool_stats *stats, u64 *data)
 982 {
 983         int i;
 984         struct ibmveth_adapter *adapter = netdev_priv(dev);
 985
 986         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 987                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 988 }
 989
 990 static void ibmveth_get_channels(struct net_device *netdev,
 991                                  struct ethtool_channels *channels)
 992 {
 993         channels->max_tx = ibmveth_real_max_tx_queues();
 994         channels->tx_count = netdev->real_num_tx_queues;
 995
 996         channels->max_rx = netdev->real_num_rx_queues;
 997         channels->rx_count = netdev->real_num_rx_queues;
 998 }
 999
1000 static int ibmveth_set_channels(struct net_device *netdev,
1001                                 struct ethtool_channels *channels)
1002 {
1003         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1004         unsigned int old = netdev->real_num_tx_queues,
1005                      goal = channels->tx_count;
1006         int rc, i;
1007
1008         /* If ndo_open has not been called yet then don't allocate, just set
1009          * desired netdev_queue's and return
1010          */
1011         if (!(netdev->flags & IFF_UP))
1012                 return netif_set_real_num_tx_queues(netdev, goal);
1013
1014         /* We have IBMVETH_MAX_QUEUES netdev_queue's allocated
1015          * but we may need to alloc/free the ltb's.
1016          */
1017         netif_tx_stop_all_queues(netdev);
1018
1019         /* Allocate any queue that we need */
1020         for (i = old; i < goal; i++) {
1021                 if (adapter->tx_ltb_ptr[i])
1022                         continue;
1023
1024                 rc = ibmveth_allocate_tx_ltb(adapter, i);
1025                 if (!rc)
1026                         continue;
1027
1028                 /* if something goes wrong, free everything we just allocated */
1029                 netdev_err(netdev, "Failed to allocate more tx queues, returning to %d queues\n",
1030                            old);
1031                 goal = old;
1032                 old = i;
1033                 break;
1034         }
1035         rc = netif_set_real_num_tx_queues(netdev, goal);
1036         if (rc) {
1037                 netdev_err(netdev, "Failed to set real tx queues, returning to %d queues\n",
1038                            old);
1039                 goal = old;
1040                 old = i;
1041         }
1042         /* Free any that are no longer needed */
1043         for (i = old; i > goal; i--) {
1044                 if (adapter->tx_ltb_ptr[i - 1])
1045                         ibmveth_free_tx_ltb(adapter, i - 1);
1046         }
1047
1048         netif_tx_wake_all_queues(netdev);
1049
1050         return rc;
1051 }
1052
1053 static const struct ethtool_ops netdev_ethtool_ops = {
1054         .get_drvinfo                     = netdev_get_drvinfo,
1055         .get_link                        = ethtool_op_get_link,
1056         .get_strings                     = ibmveth_get_strings,
1057         .get_sset_count                  = ibmveth_get_sset_count,
1058         .get_ethtool_stats               = ibmveth_get_ethtool_stats,
1059         .get_link_ksettings              = ibmveth_get_link_ksettings,
1060         .set_link_ksettings              = ibmveth_set_link_ksettings,
1061         .get_channels                    = ibmveth_get_channels,
1062         .set_channels                    = ibmveth_set_channels
1063 };
1064
1065 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1066 {
1067         return -EOPNOTSUPP;
1068 }
1069
1070 static int ibmveth_send(struct ibmveth_adapter *adapter,
1071                         unsigned long desc, unsigned long mss)
1072 {
1073         unsigned long correlator;
1074         unsigned int retry_count;
1075         unsigned long ret;
1076
1077         /*
1078          * The retry count sets a maximum for the number of broadcast and
1079          * multicast destinations within the system.
1080          */
1081         retry_count = 1024;
1082         correlator = 0;
1083         do {
1084                 ret = h_send_logical_lan(adapter->vdev->unit_address, desc,
1085                                          correlator, &correlator, mss,
1086                                          adapter->fw_large_send_support);
1087         } while ((ret == H_BUSY) && (retry_count--));
1088
1089         if (ret != H_SUCCESS && ret != H_DROPPED) {
1090                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1091                            "with rc=%ld\n", ret);
1092                 return 1;
1093         }
1094
1095         return 0;
1096 }
1097
1098 static int ibmveth_is_packet_unsupported(struct sk_buff *skb,
1099                                          struct net_device *netdev)
1100 {
1101         struct ethhdr *ether_header;
1102         int ret = 0;
1103
1104         ether_header = eth_hdr(skb);
1105
1106         if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) {
1107                 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n");
1108                 netdev->stats.tx_dropped++;
1109                 ret = -EOPNOTSUPP;
1110         }
1111
1112         return ret;
1113 }
1114
1115 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1116                                       struct net_device *netdev)
1117 {
1118         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1119         unsigned int desc_flags, total_bytes;
1120         union ibmveth_buf_desc desc;
1121         int i, queue_num = skb_get_queue_mapping(skb);
1122         unsigned long mss = 0;
1123
1124         if (ibmveth_is_packet_unsupported(skb, netdev))
1125                 goto out;
1126         /* veth can't checksum offload UDP */
1127         if (skb->ip_summed == CHECKSUM_PARTIAL &&
1128             ((skb->protocol == htons(ETH_P_IP) &&
1129               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1130              (skb->protocol == htons(ETH_P_IPV6) &&
1131               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1132             skb_checksum_help(skb)) {
1133
1134                 netdev_err(netdev, "tx: failed to checksum packet\n");
1135                 netdev->stats.tx_dropped++;
1136                 goto out;
1137         }
1138
1139         desc_flags = IBMVETH_BUF_VALID;
1140
1141         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1142                 unsigned char *buf = skb_transport_header(skb) +
1143                                                 skb->csum_offset;
1144
1145                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1146
1147                 /* Need to zero out the checksum */
1148                 buf[0] = 0;
1149                 buf[1] = 0;
1150
1151                 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1152                         desc_flags |= IBMVETH_BUF_LRG_SND;
1153         }
1154
1155         if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1156                 if (adapter->fw_large_send_support) {
1157                         mss = (unsigned long)skb_shinfo(skb)->gso_size;
1158                         adapter->tx_large_packets++;
1159                 } else if (!skb_is_gso_v6(skb)) {
1160                         /* Put -1 in the IP checksum to tell phyp it
1161                          * is a largesend packet. Put the mss in
1162                          * the TCP checksum.
1163                          */
1164                         ip_hdr(skb)->check = 0xffff;
1165                         tcp_hdr(skb)->check =
1166                                 cpu_to_be16(skb_shinfo(skb)->gso_size);
1167                         adapter->tx_large_packets++;
1168                 }
1169         }
1170
1171         /* Copy header into mapped buffer */
1172         if (unlikely(skb->len > adapter->tx_ltb_size)) {
1173                 netdev_err(adapter->netdev, "tx: packet size (%u) exceeds ltb (%u)\n",
1174                            skb->len, adapter->tx_ltb_size);
1175                 netdev->stats.tx_dropped++;
1176                 goto out;
1177         }
1178         memcpy(adapter->tx_ltb_ptr[queue_num], skb->data, skb_headlen(skb));
1179         total_bytes = skb_headlen(skb);
1180         /* Copy frags into mapped buffers */
1181         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1182                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1183
1184                 memcpy(adapter->tx_ltb_ptr[queue_num] + total_bytes,
1185                        skb_frag_address_safe(frag), skb_frag_size(frag));
1186                 total_bytes += skb_frag_size(frag);
1187         }
1188
1189         if (unlikely(total_bytes != skb->len)) {
1190                 netdev_err(adapter->netdev, "tx: incorrect packet len copied into ltb (%u != %u)\n",
1191                            skb->len, total_bytes);
1192                 netdev->stats.tx_dropped++;
1193                 goto out;
1194         }
1195         desc.fields.flags_len = desc_flags | skb->len;
1196         desc.fields.address = adapter->tx_ltb_dma[queue_num];
1197         /* finish writing to long_term_buff before VIOS accessing it */
1198         dma_wmb();
1199
1200         if (ibmveth_send(adapter, desc.desc, mss)) {
1201                 adapter->tx_send_failed++;
1202                 netdev->stats.tx_dropped++;
1203         } else {
1204                 netdev->stats.tx_packets++;
1205                 netdev->stats.tx_bytes += skb->len;
1206         }
1207
1208 out:
1209         dev_consume_skb_any(skb);
1210         return NETDEV_TX_OK;
1211
1212
1213 }
1214
1215 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1216 {
1217         struct tcphdr *tcph;
1218         int offset = 0;
1219         int hdr_len;
1220
1221         /* only TCP packets will be aggregated */
1222         if (skb->protocol == htons(ETH_P_IP)) {
1223                 struct iphdr *iph = (struct iphdr *)skb->data;
1224
1225                 if (iph->protocol == IPPROTO_TCP) {
1226                         offset = iph->ihl * 4;
1227                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1228                 } else {
1229                         return;
1230                 }
1231         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1232                 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1233
1234                 if (iph6->nexthdr == IPPROTO_TCP) {
1235                         offset = sizeof(struct ipv6hdr);
1236                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1237                 } else {
1238                         return;
1239                 }
1240         } else {
1241                 return;
1242         }
1243         /* if mss is not set through Large Packet bit/mss in rx buffer,
1244          * expect that the mss will be written to the tcp header checksum.
1245          */
1246         tcph = (struct tcphdr *)(skb->data + offset);
1247         if (lrg_pkt) {
1248                 skb_shinfo(skb)->gso_size = mss;
1249         } else if (offset) {
1250                 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1251                 tcph->check = 0;
1252         }
1253
1254         if (skb_shinfo(skb)->gso_size) {
1255                 hdr_len = offset + tcph->doff * 4;
1256                 skb_shinfo(skb)->gso_segs =
1257                                 DIV_ROUND_UP(skb->len - hdr_len,
1258                                              skb_shinfo(skb)->gso_size);
1259         }
1260 }
1261
1262 static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1263                                    struct ibmveth_adapter *adapter)
1264 {
1265         struct iphdr *iph = NULL;
1266         struct ipv6hdr *iph6 = NULL;
1267         __be16 skb_proto = 0;
1268         u16 iphlen = 0;
1269         u16 iph_proto = 0;
1270         u16 tcphdrlen = 0;
1271
1272         skb_proto = be16_to_cpu(skb->protocol);
1273
1274         if (skb_proto == ETH_P_IP) {
1275                 iph = (struct iphdr *)skb->data;
1276
1277                 /* If the IP checksum is not offloaded and if the packet
1278                  *  is large send, the checksum must be rebuilt.
1279                  */
1280                 if (iph->check == 0xffff) {
1281                         iph->check = 0;
1282                         iph->check = ip_fast_csum((unsigned char *)iph,
1283                                                   iph->ihl);
1284                 }
1285
1286                 iphlen = iph->ihl * 4;
1287                 iph_proto = iph->protocol;
1288         } else if (skb_proto == ETH_P_IPV6) {
1289                 iph6 = (struct ipv6hdr *)skb->data;
1290                 iphlen = sizeof(struct ipv6hdr);
1291                 iph_proto = iph6->nexthdr;
1292         }
1293
1294         /* When CSO is enabled the TCP checksum may have be set to NULL by
1295          * the sender given that we zeroed out TCP checksum field in
1296          * transmit path (refer ibmveth_start_xmit routine). In this case set
1297          * up CHECKSUM_PARTIAL. If the packet is forwarded, the checksum will
1298          * then be recalculated by the destination NIC (CSO must be enabled
1299          * on the destination NIC).
1300          *
1301          * In an OVS environment, when a flow is not cached, specifically for a
1302          * new TCP connection, the first packet information is passed up to
1303          * the user space for finding a flow. During this process, OVS computes
1304          * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1305          *
1306          * So, re-compute TCP pseudo header checksum.
1307          */
1308
1309         if (iph_proto == IPPROTO_TCP) {
1310                 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1311
1312                 if (tcph->check == 0x0000) {
1313                         /* Recompute TCP pseudo header checksum  */
1314                         tcphdrlen = skb->len - iphlen;
1315                         if (skb_proto == ETH_P_IP)
1316                                 tcph->check =
1317                                  ~csum_tcpudp_magic(iph->saddr,
1318                                 iph->daddr, tcphdrlen, iph_proto, 0);
1319                         else if (skb_proto == ETH_P_IPV6)
1320                                 tcph->check =
1321                                  ~csum_ipv6_magic(&iph6->saddr,
1322                                 &iph6->daddr, tcphdrlen, iph_proto, 0);
1323                         /* Setup SKB fields for checksum offload */
1324                         skb_partial_csum_set(skb, iphlen,
1325                                              offsetof(struct tcphdr, check));
1326                         skb_reset_network_header(skb);
1327                 }
1328         }
1329 }
1330
1331 static int ibmveth_poll(struct napi_struct *napi, int budget)
1332 {
1333         struct ibmveth_adapter *adapter =
1334                         container_of(napi, struct ibmveth_adapter, napi);
1335         struct net_device *netdev = adapter->netdev;
1336         int frames_processed = 0;
1337         unsigned long lpar_rc;
1338         u16 mss = 0;
1339
1340         while (frames_processed < budget) {
1341                 if (!ibmveth_rxq_pending_buffer(adapter))
1342                         break;
1343
1344                 smp_rmb();
1345                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1346                         wmb(); /* suggested by larson1 */
1347                         adapter->rx_invalid_buffer++;
1348                         netdev_dbg(netdev, "recycling invalid buffer\n");
1349                         ibmveth_rxq_recycle_buffer(adapter);
1350                 } else {
1351                         struct sk_buff *skb, *new_skb;
1352                         int length = ibmveth_rxq_frame_length(adapter);
1353                         int offset = ibmveth_rxq_frame_offset(adapter);
1354                         int csum_good = ibmveth_rxq_csum_good(adapter);
1355                         int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1356                         __sum16 iph_check = 0;
1357
1358                         skb = ibmveth_rxq_get_buffer(adapter);
1359
1360                         /* if the large packet bit is set in the rx queue
1361                          * descriptor, the mss will be written by PHYP eight
1362                          * bytes from the start of the rx buffer, which is
1363                          * skb->data at this stage
1364                          */
1365                         if (lrg_pkt) {
1366                                 __be64 *rxmss = (__be64 *)(skb->data + 8);
1367
1368                                 mss = (u16)be64_to_cpu(*rxmss);
1369                         }
1370
1371                         new_skb = NULL;
1372                         if (length < rx_copybreak)
1373                                 new_skb = netdev_alloc_skb(netdev, length);
1374
1375                         if (new_skb) {
1376                                 skb_copy_to_linear_data(new_skb,
1377                                                         skb->data + offset,
1378                                                         length);
1379                                 if (rx_flush)
1380                                         ibmveth_flush_buffer(skb->data,
1381                                                 length + offset);
1382                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1383                                         kfree_skb(skb);
1384                                 skb = new_skb;
1385                         } else {
1386                                 ibmveth_rxq_harvest_buffer(adapter);
1387                                 skb_reserve(skb, offset);
1388                         }
1389
1390                         skb_put(skb, length);
1391                         skb->protocol = eth_type_trans(skb, netdev);
1392
1393                         /* PHYP without PLSO support places a -1 in the ip
1394                          * checksum for large send frames.
1395                          */
1396                         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
1397                                 struct iphdr *iph = (struct iphdr *)skb->data;
1398
1399                                 iph_check = iph->check;
1400                         }
1401
1402                         if ((length > netdev->mtu + ETH_HLEN) ||
1403                             lrg_pkt || iph_check == 0xffff) {
1404                                 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1405                                 adapter->rx_large_packets++;
1406                         }
1407
1408                         if (csum_good) {
1409                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1410                                 ibmveth_rx_csum_helper(skb, adapter);
1411                         }
1412
1413                         napi_gro_receive(napi, skb);    /* send it up */
1414
1415                         netdev->stats.rx_packets++;
1416                         netdev->stats.rx_bytes += length;
1417                         frames_processed++;
1418                 }
1419         }
1420
1421         ibmveth_replenish_task(adapter);
1422
1423         if (frames_processed < budget) {
1424                 napi_complete_done(napi, frames_processed);
1425
1426                 /* We think we are done - reenable interrupts,
1427                  * then check once more to make sure we are done.
1428                  */
1429                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1430                                        VIO_IRQ_ENABLE);
1431
1432                 BUG_ON(lpar_rc != H_SUCCESS);
1433
1434                 if (ibmveth_rxq_pending_buffer(adapter) &&
1435                     napi_reschedule(napi)) {
1436                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1437                                                VIO_IRQ_DISABLE);
1438                 }
1439         }
1440
1441         return frames_processed;
1442 }
1443
1444 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1445 {
1446         struct net_device *netdev = dev_instance;
1447         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1448         unsigned long lpar_rc;
1449
1450         if (napi_schedule_prep(&adapter->napi)) {
1451                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1452                                        VIO_IRQ_DISABLE);
1453                 BUG_ON(lpar_rc != H_SUCCESS);
1454                 __napi_schedule(&adapter->napi);
1455         }
1456         return IRQ_HANDLED;
1457 }
1458
1459 static void ibmveth_set_multicast_list(struct net_device *netdev)
1460 {
1461         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1462         unsigned long lpar_rc;
1463
1464         if ((netdev->flags & IFF_PROMISC) ||
1465             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1466                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1467                                            IbmVethMcastEnableRecv |
1468                                            IbmVethMcastDisableFiltering,
1469                                            0);
1470                 if (lpar_rc != H_SUCCESS) {
1471                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1472                                    "entering promisc mode\n", lpar_rc);
1473                 }
1474         } else {
1475                 struct netdev_hw_addr *ha;
1476                 /* clear the filter table & disable filtering */
1477                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1478                                            IbmVethMcastEnableRecv |
1479                                            IbmVethMcastDisableFiltering |
1480                                            IbmVethMcastClearFilterTable,
1481                                            0);
1482                 if (lpar_rc != H_SUCCESS) {
1483                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1484                                    "attempting to clear filter table\n",
1485                                    lpar_rc);
1486                 }
1487                 /* add the addresses to the filter table */
1488                 netdev_for_each_mc_addr(ha, netdev) {
1489                         /* add the multicast address to the filter table */
1490                         u64 mcast_addr;
1491                         mcast_addr = ether_addr_to_u64(ha->addr);
1492                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1493                                                    IbmVethMcastAddFilter,
1494                                                    mcast_addr);
1495                         if (lpar_rc != H_SUCCESS) {
1496                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1497                                            "when adding an entry to the filter "
1498                                            "table\n", lpar_rc);
1499                         }
1500                 }
1501
1502                 /* re-enable filtering */
1503                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1504                                            IbmVethMcastEnableFiltering,
1505                                            0);
1506                 if (lpar_rc != H_SUCCESS) {
1507                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1508                                    "enabling filtering\n", lpar_rc);
1509                 }
1510         }
1511 }
1512
1513 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1514 {
1515         struct ibmveth_adapter *adapter = netdev_priv(dev);
1516         struct vio_dev *viodev = adapter->vdev;
1517         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1518         int i, rc;
1519         int need_restart = 0;
1520
1521         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1522                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1523                         break;
1524
1525         if (i == IBMVETH_NUM_BUFF_POOLS)
1526                 return -EINVAL;
1527
1528         /* Deactivate all the buffer pools so that the next loop can activate
1529            only the buffer pools necessary to hold the new MTU */
1530         if (netif_running(adapter->netdev)) {
1531                 need_restart = 1;
1532                 ibmveth_close(adapter->netdev);
1533         }
1534
1535         /* Look for an active buffer pool that can hold the new MTU */
1536         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1537                 adapter->rx_buff_pool[i].active = 1;
1538
1539                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1540                         dev->mtu = new_mtu;
1541                         vio_cmo_set_dev_desired(viodev,
1542                                                 ibmveth_get_desired_dma
1543                                                 (viodev));
1544                         if (need_restart) {
1545                                 return ibmveth_open(adapter->netdev);
1546                         }
1547                         return 0;
1548                 }
1549         }
1550
1551         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1552                 return rc;
1553
1554         return -EINVAL;
1555 }
1556
1557 #ifdef CONFIG_NET_POLL_CONTROLLER
1558 static void ibmveth_poll_controller(struct net_device *dev)
1559 {
1560         ibmveth_replenish_task(netdev_priv(dev));
1561         ibmveth_interrupt(dev->irq, dev);
1562 }
1563 #endif
1564
1565 /**
1566  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1567  *
1568  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1569  *
1570  * Return value:
1571  *      Number of bytes of IO data the driver will need to perform well.
1572  */
1573 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1574 {
1575         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1576         struct ibmveth_adapter *adapter;
1577         struct iommu_table *tbl;
1578         unsigned long ret;
1579         int i;
1580         int rxqentries = 1;
1581
1582         tbl = get_iommu_table_base(&vdev->dev);
1583
1584         /* netdev inits at probe time along with the structures we need below*/
1585         if (netdev == NULL)
1586                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1587
1588         adapter = netdev_priv(netdev);
1589
1590         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1591         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1592         /* add size of mapped tx buffers */
1593         ret += IOMMU_PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE, tbl);
1594
1595         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1596                 /* add the size of the active receive buffers */
1597                 if (adapter->rx_buff_pool[i].active)
1598                         ret +=
1599                             adapter->rx_buff_pool[i].size *
1600                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1601                                              buff_size, tbl);
1602                 rxqentries += adapter->rx_buff_pool[i].size;
1603         }
1604         /* add the size of the receive queue entries */
1605         ret += IOMMU_PAGE_ALIGN(
1606                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1607
1608         return ret;
1609 }
1610
1611 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1612 {
1613         struct ibmveth_adapter *adapter = netdev_priv(dev);
1614         struct sockaddr *addr = p;
1615         u64 mac_address;
1616         int rc;
1617
1618         if (!is_valid_ether_addr(addr->sa_data))
1619                 return -EADDRNOTAVAIL;
1620
1621         mac_address = ether_addr_to_u64(addr->sa_data);
1622         rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1623         if (rc) {
1624                 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1625                 return rc;
1626         }
1627
1628         eth_hw_addr_set(dev, addr->sa_data);
1629
1630         return 0;
1631 }
1632
1633 static const struct net_device_ops ibmveth_netdev_ops = {
1634         .ndo_open               = ibmveth_open,
1635         .ndo_stop               = ibmveth_close,
1636         .ndo_start_xmit         = ibmveth_start_xmit,
1637         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1638         .ndo_eth_ioctl          = ibmveth_ioctl,
1639         .ndo_change_mtu         = ibmveth_change_mtu,
1640         .ndo_fix_features       = ibmveth_fix_features,
1641         .ndo_set_features       = ibmveth_set_features,
1642         .ndo_validate_addr      = eth_validate_addr,
1643         .ndo_set_mac_address    = ibmveth_set_mac_addr,
1644 #ifdef CONFIG_NET_POLL_CONTROLLER
1645         .ndo_poll_controller    = ibmveth_poll_controller,
1646 #endif
1647 };
1648
1649 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1650 {
1651         int rc, i, mac_len;
1652         struct net_device *netdev;
1653         struct ibmveth_adapter *adapter;
1654         unsigned char *mac_addr_p;
1655         __be32 *mcastFilterSize_p;
1656         long ret;
1657         unsigned long ret_attr;
1658
1659         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1660                 dev->unit_address);
1661
1662         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1663                                                         &mac_len);
1664         if (!mac_addr_p) {
1665                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1666                 return -EINVAL;
1667         }
1668         /* Workaround for old/broken pHyp */
1669         if (mac_len == 8)
1670                 mac_addr_p += 2;
1671         else if (mac_len != 6) {
1672                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1673                         mac_len);
1674                 return -EINVAL;
1675         }
1676
1677         mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1678                                                         VETH_MCAST_FILTER_SIZE,
1679                                                         NULL);
1680         if (!mcastFilterSize_p) {
1681                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1682                         "attribute\n");
1683                 return -EINVAL;
1684         }
1685
1686         netdev = alloc_etherdev_mqs(sizeof(struct ibmveth_adapter), IBMVETH_MAX_QUEUES, 1);
1687         if (!netdev)
1688                 return -ENOMEM;
1689
1690         adapter = netdev_priv(netdev);
1691         dev_set_drvdata(&dev->dev, netdev);
1692
1693         adapter->vdev = dev;
1694         adapter->netdev = netdev;
1695         adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1696         ibmveth_init_link_settings(netdev);
1697
1698         netif_napi_add_weight(netdev, &adapter->napi, ibmveth_poll, 16);
1699
1700         netdev->irq = dev->irq;
1701         netdev->netdev_ops = &ibmveth_netdev_ops;
1702         netdev->ethtool_ops = &netdev_ethtool_ops;
1703         SET_NETDEV_DEV(netdev, &dev->dev);
1704         netdev->hw_features = NETIF_F_SG;
1705         if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1706                 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1707                                        NETIF_F_RXCSUM;
1708         }
1709
1710         netdev->features |= netdev->hw_features;
1711
1712         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1713
1714         /* If running older firmware, TSO should not be enabled by default */
1715         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1716             !old_large_send) {
1717                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1718                 netdev->features |= netdev->hw_features;
1719         } else {
1720                 netdev->hw_features |= NETIF_F_TSO;
1721         }
1722
1723         adapter->is_active_trunk = false;
1724         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1725                 adapter->is_active_trunk = true;
1726                 netdev->hw_features |= NETIF_F_FRAGLIST;
1727                 netdev->features |= NETIF_F_FRAGLIST;
1728         }
1729
1730         netdev->min_mtu = IBMVETH_MIN_MTU;
1731         netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
1732
1733         eth_hw_addr_set(netdev, mac_addr_p);
1734
1735         if (firmware_has_feature(FW_FEATURE_CMO))
1736                 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1737
1738         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1739                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1740                 int error;
1741
1742                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1743                                          pool_count[i], pool_size[i],
1744                                          pool_active[i]);
1745                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1746                                              &dev->dev.kobj, "pool%d", i);
1747                 if (!error)
1748                         kobject_uevent(kobj, KOBJ_ADD);
1749         }
1750
1751         rc = netif_set_real_num_tx_queues(netdev, min(num_online_cpus(),
1752                                                       IBMVETH_DEFAULT_QUEUES));
1753         if (rc) {
1754                 netdev_dbg(netdev, "failed to set number of tx queues rc=%d\n",
1755                            rc);
1756                 free_netdev(netdev);
1757                 return rc;
1758         }
1759         adapter->tx_ltb_size = PAGE_ALIGN(IBMVETH_MAX_TX_BUF_SIZE);
1760         for (i = 0; i < IBMVETH_MAX_QUEUES; i++)
1761                 adapter->tx_ltb_ptr[i] = NULL;
1762
1763         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1764         netdev_dbg(netdev, "registering netdev...\n");
1765
1766         ibmveth_set_features(netdev, netdev->features);
1767
1768         rc = register_netdev(netdev);
1769
1770         if (rc) {
1771                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1772                 free_netdev(netdev);
1773                 return rc;
1774         }
1775
1776         netdev_dbg(netdev, "registered\n");
1777
1778         return 0;
1779 }
1780
1781 static void ibmveth_remove(struct vio_dev *dev)
1782 {
1783         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1784         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1785         int i;
1786
1787         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1788                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1789
1790         unregister_netdev(netdev);
1791
1792         free_netdev(netdev);
1793         dev_set_drvdata(&dev->dev, NULL);
1794 }
1795
1796 static struct attribute veth_active_attr;
1797 static struct attribute veth_num_attr;
1798 static struct attribute veth_size_attr;
1799
1800 static ssize_t veth_pool_show(struct kobject *kobj,
1801                               struct attribute *attr, char *buf)
1802 {
1803         struct ibmveth_buff_pool *pool = container_of(kobj,
1804                                                       struct ibmveth_buff_pool,
1805                                                       kobj);
1806
1807         if (attr == &veth_active_attr)
1808                 return sprintf(buf, "%d\n", pool->active);
1809         else if (attr == &veth_num_attr)
1810                 return sprintf(buf, "%d\n", pool->size);
1811         else if (attr == &veth_size_attr)
1812                 return sprintf(buf, "%d\n", pool->buff_size);
1813         return 0;
1814 }
1815
1816 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1817                                const char *buf, size_t count)
1818 {
1819         struct ibmveth_buff_pool *pool = container_of(kobj,
1820                                                       struct ibmveth_buff_pool,
1821                                                       kobj);
1822         struct net_device *netdev = dev_get_drvdata(kobj_to_dev(kobj->parent));
1823         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1824         long value = simple_strtol(buf, NULL, 10);
1825         long rc;
1826
1827         if (attr == &veth_active_attr) {
1828                 if (value && !pool->active) {
1829                         if (netif_running(netdev)) {
1830                                 if (ibmveth_alloc_buffer_pool(pool)) {
1831                                         netdev_err(netdev,
1832                                                    "unable to alloc pool\n");
1833                                         return -ENOMEM;
1834                                 }
1835                                 pool->active = 1;
1836                                 ibmveth_close(netdev);
1837                                 if ((rc = ibmveth_open(netdev)))
1838                                         return rc;
1839                         } else {
1840                                 pool->active = 1;
1841                         }
1842                 } else if (!value && pool->active) {
1843                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1844                         int i;
1845                         /* Make sure there is a buffer pool with buffers that
1846                            can hold a packet of the size of the MTU */
1847                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1848                                 if (pool == &adapter->rx_buff_pool[i])
1849                                         continue;
1850                                 if (!adapter->rx_buff_pool[i].active)
1851                                         continue;
1852                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1853                                         break;
1854                         }
1855
1856                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1857                                 netdev_err(netdev, "no active pool >= MTU\n");
1858                                 return -EPERM;
1859                         }
1860
1861                         if (netif_running(netdev)) {
1862                                 ibmveth_close(netdev);
1863                                 pool->active = 0;
1864                                 if ((rc = ibmveth_open(netdev)))
1865                                         return rc;
1866                         }
1867                         pool->active = 0;
1868                 }
1869         } else if (attr == &veth_num_attr) {
1870                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1871                         return -EINVAL;
1872                 } else {
1873                         if (netif_running(netdev)) {
1874                                 ibmveth_close(netdev);
1875                                 pool->size = value;
1876                                 if ((rc = ibmveth_open(netdev)))
1877                                         return rc;
1878                         } else {
1879                                 pool->size = value;
1880                         }
1881                 }
1882         } else if (attr == &veth_size_attr) {
1883                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1884                         return -EINVAL;
1885                 } else {
1886                         if (netif_running(netdev)) {
1887                                 ibmveth_close(netdev);
1888                                 pool->buff_size = value;
1889                                 if ((rc = ibmveth_open(netdev)))
1890                                         return rc;
1891                         } else {
1892                                 pool->buff_size = value;
1893                         }
1894                 }
1895         }
1896
1897         /* kick the interrupt handler to allocate/deallocate pools */
1898         ibmveth_interrupt(netdev->irq, netdev);
1899         return count;
1900 }
1901
1902
1903 #define ATTR(_name, _mode)                              \
1904         struct attribute veth_##_name##_attr = {        \
1905         .name = __stringify(_name), .mode = _mode,      \
1906         };
1907
1908 static ATTR(active, 0644);
1909 static ATTR(num, 0644);
1910 static ATTR(size, 0644);
1911
1912 static struct attribute *veth_pool_attrs[] = {
1913         &veth_active_attr,
1914         &veth_num_attr,
1915         &veth_size_attr,
1916         NULL,
1917 };
1918 ATTRIBUTE_GROUPS(veth_pool);
1919
1920 static const struct sysfs_ops veth_pool_ops = {
1921         .show   = veth_pool_show,
1922         .store  = veth_pool_store,
1923 };
1924
1925 static struct kobj_type ktype_veth_pool = {
1926         .release        = NULL,
1927         .sysfs_ops      = &veth_pool_ops,
1928         .default_groups = veth_pool_groups,
1929 };
1930
1931 static int ibmveth_resume(struct device *dev)
1932 {
1933         struct net_device *netdev = dev_get_drvdata(dev);
1934         ibmveth_interrupt(netdev->irq, netdev);
1935         return 0;
1936 }
1937
1938 static const struct vio_device_id ibmveth_device_table[] = {
1939         { "network", "IBM,l-lan"},
1940         { "", "" }
1941 };
1942 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1943
1944 static const struct dev_pm_ops ibmveth_pm_ops = {
1945         .resume = ibmveth_resume
1946 };
1947
1948 static struct vio_driver ibmveth_driver = {
1949         .id_table       = ibmveth_device_table,
1950         .probe          = ibmveth_probe,
1951         .remove         = ibmveth_remove,
1952         .get_desired_dma = ibmveth_get_desired_dma,
1953         .name           = ibmveth_driver_name,
1954         .pm             = &ibmveth_pm_ops,
1955 };
1956
1957 static int __init ibmveth_module_init(void)
1958 {
1959         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1960                ibmveth_driver_string, ibmveth_driver_version);
1961
1962         return vio_register_driver(&ibmveth_driver);
1963 }
1964
1965 static void __exit ibmveth_module_exit(void)
1966 {
1967         vio_unregister_driver(&ibmveth_driver);
1968 }
1969
1970 module_init(ibmveth_module_init);
1971 module_exit(ibmveth_module_exit);