drivers/net/ibmveth.c

   1 /*
   2  * IBM Power Virtual Ethernet Device Driver
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright (C) IBM Corporation, 2003, 2010
  19  *
  20  * Authors: Dave Larson <larson1@us.ibm.com>
  21  *          Santiago Leon <santil@linux.vnet.ibm.com>
  22  *          Brian King <brking@linux.vnet.ibm.com>
  23  *          Robert Jennings <rcj@linux.vnet.ibm.com>
  24  *          Anton Blanchard <anton@au.ibm.com>
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/kernel.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/init.h>
  37 #include <linux/mm.h>
  38 #include <linux/pm.h>
  39 #include <linux/ethtool.h>
  40 #include <linux/in.h>
  41 #include <linux/ip.h>
  42 #include <linux/ipv6.h>
  43 #include <linux/slab.h>
  44 #include <asm/hvcall.h>
  45 #include <asm/atomic.h>
  46 #include <asm/vio.h>
  47 #include <asm/iommu.h>
  48 #include <asm/firmware.h>
  49
  50 #include "ibmveth.h"
  51
  52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  55
  56 static struct kobj_type ktype_veth_pool;
  57
  58
  59 static const char ibmveth_driver_name[] = "ibmveth";
  60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  61 #define ibmveth_driver_version "1.04"
  62
  63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  65 MODULE_LICENSE("GPL");
  66 MODULE_VERSION(ibmveth_driver_version);
  67
  68 static unsigned int tx_copybreak __read_mostly = 128;
  69 module_param(tx_copybreak, uint, 0644);
  70 MODULE_PARM_DESC(tx_copybreak,
  71         "Maximum size of packet that is copied to a new buffer on transmit");
  72
  73 static unsigned int rx_copybreak __read_mostly = 128;
  74 module_param(rx_copybreak, uint, 0644);
  75 MODULE_PARM_DESC(rx_copybreak,
  76         "Maximum size of packet that is copied to a new buffer on receive");
  77
  78 static unsigned int rx_flush __read_mostly = 0;
  79 module_param(rx_flush, uint, 0644);
  80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  81
  82 struct ibmveth_stat {
  83         char name[ETH_GSTRING_LEN];
  84         int offset;
  85 };
  86
  87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  89
  90 struct ibmveth_stat ibmveth_stats[] = {
  91         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  92         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
  93         { "replenish_add_buff_failure",
  94                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
  95         { "replenish_add_buff_success",
  96                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
  97         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
  98         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
  99         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 100         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 101         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
 102         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
 103 };
 104
 105 /* simple methods of getting data from the current rxq entry */
 106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 107 {
 108         return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
 109 }
 110
 111 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 112 {
 113         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 114                         IBMVETH_RXQ_TOGGLE_SHIFT;
 115 }
 116
 117 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 118 {
 119         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 120 }
 121
 122 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 123 {
 124         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 125 }
 126
 127 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 128 {
 129         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 130 }
 131
 132 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 133 {
 134         return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
 135 }
 136
 137 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 138 {
 139         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 140 }
 141
 142 /* setup the initial settings for a buffer pool */
 143 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 144                                      u32 pool_index, u32 pool_size,
 145                                      u32 buff_size, u32 pool_active)
 146 {
 147         pool->size = pool_size;
 148         pool->index = pool_index;
 149         pool->buff_size = buff_size;
 150         pool->threshold = pool_size * 7 / 8;
 151         pool->active = pool_active;
 152 }
 153
 154 /* allocate and setup an buffer pool - called during open */
 155 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 156 {
 157         int i;
 158
 159         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 160
 161         if (!pool->free_map)
 162                 return -1;
 163
 164         pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
 165         if (!pool->dma_addr) {
 166                 kfree(pool->free_map);
 167                 pool->free_map = NULL;
 168                 return -1;
 169         }
 170
 171         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 172
 173         if (!pool->skbuff) {
 174                 kfree(pool->dma_addr);
 175                 pool->dma_addr = NULL;
 176
 177                 kfree(pool->free_map);
 178                 pool->free_map = NULL;
 179                 return -1;
 180         }
 181
 182         memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
 183
 184         for (i = 0; i < pool->size; ++i)
 185                 pool->free_map[i] = i;
 186
 187         atomic_set(&pool->available, 0);
 188         pool->producer_index = 0;
 189         pool->consumer_index = 0;
 190
 191         return 0;
 192 }
 193
 194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
 195 {
 196         unsigned long offset;
 197
 198         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
 199                 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
 200 }
 201
 202 /* replenish the buffers for a pool.  note that we don't need to
 203  * skb_reserve these since they are used for incoming...
 204  */
 205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
 206                                           struct ibmveth_buff_pool *pool)
 207 {
 208         u32 i;
 209         u32 count = pool->size - atomic_read(&pool->available);
 210         u32 buffers_added = 0;
 211         struct sk_buff *skb;
 212         unsigned int free_index, index;
 213         u64 correlator;
 214         unsigned long lpar_rc;
 215         dma_addr_t dma_addr;
 216
 217         mb();
 218
 219         for (i = 0; i < count; ++i) {
 220                 union ibmveth_buf_desc desc;
 221
 222                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 223
 224                 if (!skb) {
 225                         netdev_dbg(adapter->netdev,
 226                                    "replenish: unable to allocate skb\n");
 227                         adapter->replenish_no_mem++;
 228                         break;
 229                 }
 230
 231                 free_index = pool->consumer_index;
 232                 pool->consumer_index++;
 233                 if (pool->consumer_index >= pool->size)
 234                         pool->consumer_index = 0;
 235                 index = pool->free_map[free_index];
 236
 237                 BUG_ON(index == IBM_VETH_INVALID_MAP);
 238                 BUG_ON(pool->skbuff[index] != NULL);
 239
 240                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 241                                 pool->buff_size, DMA_FROM_DEVICE);
 242
 243                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 244                         goto failure;
 245
 246                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 247                 pool->dma_addr[index] = dma_addr;
 248                 pool->skbuff[index] = skb;
 249
 250                 correlator = ((u64)pool->index << 32) | index;
 251                 *(u64 *)skb->data = correlator;
 252
 253                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 254                 desc.fields.address = dma_addr;
 255
 256                 if (rx_flush) {
 257                         unsigned int len = min(pool->buff_size,
 258                                                 adapter->netdev->mtu +
 259                                                 IBMVETH_BUFF_OH);
 260                         ibmveth_flush_buffer(skb->data, len);
 261                 }
 262                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
 263                                                    desc.desc);
 264
 265                 if (lpar_rc != H_SUCCESS) {
 266                         goto failure;
 267                 } else {
 268                         buffers_added++;
 269                         adapter->replenish_add_buff_success++;
 270                 }
 271         }
 272
 273         mb();
 274         atomic_add(buffers_added, &(pool->available));
 275         return;
 276
 277 failure:
 278         pool->free_map[free_index] = index;
 279         pool->skbuff[index] = NULL;
 280         if (pool->consumer_index == 0)
 281                 pool->consumer_index = pool->size - 1;
 282         else
 283                 pool->consumer_index--;
 284         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 285                 dma_unmap_single(&adapter->vdev->dev,
 286                                  pool->dma_addr[index], pool->buff_size,
 287                                  DMA_FROM_DEVICE);
 288         dev_kfree_skb_any(skb);
 289         adapter->replenish_add_buff_failure++;
 290
 291         mb();
 292         atomic_add(buffers_added, &(pool->available));
 293 }
 294
 295 /* replenish routine */
 296 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 297 {
 298         int i;
 299
 300         adapter->replenish_task_cycles++;
 301
 302         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 303                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 304
 305                 if (pool->active &&
 306                     (atomic_read(&pool->available) < pool->threshold))
 307                         ibmveth_replenish_buffer_pool(adapter, pool);
 308         }
 309
 310         adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
 311                                                 4096 - 8);
 312 }
 313
 314 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 315 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 316                                      struct ibmveth_buff_pool *pool)
 317 {
 318         int i;
 319
 320         kfree(pool->free_map);
 321         pool->free_map = NULL;
 322
 323         if (pool->skbuff && pool->dma_addr) {
 324                 for (i = 0; i < pool->size; ++i) {
 325                         struct sk_buff *skb = pool->skbuff[i];
 326                         if (skb) {
 327                                 dma_unmap_single(&adapter->vdev->dev,
 328                                                  pool->dma_addr[i],
 329                                                  pool->buff_size,
 330                                                  DMA_FROM_DEVICE);
 331                                 dev_kfree_skb_any(skb);
 332                                 pool->skbuff[i] = NULL;
 333                         }
 334                 }
 335         }
 336
 337         if (pool->dma_addr) {
 338                 kfree(pool->dma_addr);
 339                 pool->dma_addr = NULL;
 340         }
 341
 342         if (pool->skbuff) {
 343                 kfree(pool->skbuff);
 344                 pool->skbuff = NULL;
 345         }
 346 }
 347
 348 /* remove a buffer from a pool */
 349 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 350                                             u64 correlator)
 351 {
 352         unsigned int pool  = correlator >> 32;
 353         unsigned int index = correlator & 0xffffffffUL;
 354         unsigned int free_index;
 355         struct sk_buff *skb;
 356
 357         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 358         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 359
 360         skb = adapter->rx_buff_pool[pool].skbuff[index];
 361
 362         BUG_ON(skb == NULL);
 363
 364         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 365
 366         dma_unmap_single(&adapter->vdev->dev,
 367                          adapter->rx_buff_pool[pool].dma_addr[index],
 368                          adapter->rx_buff_pool[pool].buff_size,
 369                          DMA_FROM_DEVICE);
 370
 371         free_index = adapter->rx_buff_pool[pool].producer_index;
 372         adapter->rx_buff_pool[pool].producer_index++;
 373         if (adapter->rx_buff_pool[pool].producer_index >=
 374             adapter->rx_buff_pool[pool].size)
 375                 adapter->rx_buff_pool[pool].producer_index = 0;
 376         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 377
 378         mb();
 379
 380         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 381 }
 382
 383 /* get the current buffer on the rx queue */
 384 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 385 {
 386         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 387         unsigned int pool = correlator >> 32;
 388         unsigned int index = correlator & 0xffffffffUL;
 389
 390         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 391         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 392
 393         return adapter->rx_buff_pool[pool].skbuff[index];
 394 }
 395
 396 /* recycle the current buffer on the rx queue */
 397 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 398 {
 399         u32 q_index = adapter->rx_queue.index;
 400         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 401         unsigned int pool = correlator >> 32;
 402         unsigned int index = correlator & 0xffffffffUL;
 403         union ibmveth_buf_desc desc;
 404         unsigned long lpar_rc;
 405
 406         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 407         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 408
 409         if (!adapter->rx_buff_pool[pool].active) {
 410                 ibmveth_rxq_harvest_buffer(adapter);
 411                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 412                 return;
 413         }
 414
 415         desc.fields.flags_len = IBMVETH_BUF_VALID |
 416                 adapter->rx_buff_pool[pool].buff_size;
 417         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 418
 419         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 420
 421         if (lpar_rc != H_SUCCESS) {
 422                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 423                            "during recycle rc=%ld", lpar_rc);
 424                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 425         }
 426
 427         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 428                 adapter->rx_queue.index = 0;
 429                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 430         }
 431 }
 432
 433 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 434 {
 435         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 436
 437         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 438                 adapter->rx_queue.index = 0;
 439                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 440         }
 441 }
 442
 443 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 444 {
 445         int i;
 446         struct device *dev = &adapter->vdev->dev;
 447
 448         if (adapter->buffer_list_addr != NULL) {
 449                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
 450                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 451                                         DMA_BIDIRECTIONAL);
 452                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 453                 }
 454                 free_page((unsigned long)adapter->buffer_list_addr);
 455                 adapter->buffer_list_addr = NULL;
 456         }
 457
 458         if (adapter->filter_list_addr != NULL) {
 459                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
 460                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 461                                         DMA_BIDIRECTIONAL);
 462                         adapter->filter_list_dma = DMA_ERROR_CODE;
 463                 }
 464                 free_page((unsigned long)adapter->filter_list_addr);
 465                 adapter->filter_list_addr = NULL;
 466         }
 467
 468         if (adapter->rx_queue.queue_addr != NULL) {
 469                 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
 470                         dma_unmap_single(dev,
 471                                         adapter->rx_queue.queue_dma,
 472                                         adapter->rx_queue.queue_len,
 473                                         DMA_BIDIRECTIONAL);
 474                         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
 475                 }
 476                 kfree(adapter->rx_queue.queue_addr);
 477                 adapter->rx_queue.queue_addr = NULL;
 478         }
 479
 480         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 481                 if (adapter->rx_buff_pool[i].active)
 482                         ibmveth_free_buffer_pool(adapter,
 483                                                  &adapter->rx_buff_pool[i]);
 484
 485         if (adapter->bounce_buffer != NULL) {
 486                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 487                         dma_unmap_single(&adapter->vdev->dev,
 488                                         adapter->bounce_buffer_dma,
 489                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
 490                                         DMA_BIDIRECTIONAL);
 491                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
 492                 }
 493                 kfree(adapter->bounce_buffer);
 494                 adapter->bounce_buffer = NULL;
 495         }
 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 = 0;
 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         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 544         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 545
 546         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 547                 netdev_err(netdev, "unable to allocate filter or buffer list "
 548                            "pages\n");
 549                 rc = -ENOMEM;
 550                 goto err_out;
 551         }
 552
 553         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 554                                                 rxq_entries;
 555         adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len,
 556                                                 GFP_KERNEL);
 557
 558         if (!adapter->rx_queue.queue_addr) {
 559                 netdev_err(netdev, "unable to allocate rx queue pages\n");
 560                 rc = -ENOMEM;
 561                 goto err_out;
 562         }
 563
 564         dev = &adapter->vdev->dev;
 565
 566         adapter->buffer_list_dma = dma_map_single(dev,
 567                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 568         adapter->filter_list_dma = dma_map_single(dev,
 569                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 570         adapter->rx_queue.queue_dma = dma_map_single(dev,
 571                         adapter->rx_queue.queue_addr,
 572                         adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
 573
 574         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
 575             (dma_mapping_error(dev, adapter->filter_list_dma)) ||
 576             (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
 577                 netdev_err(netdev, "unable to map filter or buffer list "
 578                            "pages\n");
 579                 rc = -ENOMEM;
 580                 goto err_out;
 581         }
 582
 583         adapter->rx_queue.index = 0;
 584         adapter->rx_queue.num_slots = rxq_entries;
 585         adapter->rx_queue.toggle = 1;
 586
 587         memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
 588         mac_address = mac_address >> 16;
 589
 590         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 591                                         adapter->rx_queue.queue_len;
 592         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 593
 594         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 595         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 596         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 597
 598         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 599
 600         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 601
 602         if (lpar_rc != H_SUCCESS) {
 603                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 604                            lpar_rc);
 605                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 606                            "desc:0x%llx MAC:0x%llx\n",
 607                                      adapter->buffer_list_dma,
 608                                      adapter->filter_list_dma,
 609                                      rxq_desc.desc,
 610                                      mac_address);
 611                 rc = -ENONET;
 612                 goto err_out;
 613         }
 614
 615         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 616                 if (!adapter->rx_buff_pool[i].active)
 617                         continue;
 618                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 619                         netdev_err(netdev, "unable to alloc pool\n");
 620                         adapter->rx_buff_pool[i].active = 0;
 621                         rc = -ENOMEM;
 622                         goto err_out;
 623                 }
 624         }
 625
 626         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 627         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 628                          netdev);
 629         if (rc != 0) {
 630                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 631                            netdev->irq, rc);
 632                 do {
 633                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 634                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 635
 636                 goto err_out;
 637         }
 638
 639         adapter->bounce_buffer =
 640             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 641         if (!adapter->bounce_buffer) {
 642                 netdev_err(netdev, "unable to allocate bounce buffer\n");
 643                 rc = -ENOMEM;
 644                 goto err_out_free_irq;
 645         }
 646         adapter->bounce_buffer_dma =
 647             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 648                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 649         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 650                 netdev_err(netdev, "unable to map bounce buffer\n");
 651                 rc = -ENOMEM;
 652                 goto err_out_free_irq;
 653         }
 654
 655         netdev_dbg(netdev, "initial replenish cycle\n");
 656         ibmveth_interrupt(netdev->irq, netdev);
 657
 658         netif_start_queue(netdev);
 659
 660         netdev_dbg(netdev, "open complete\n");
 661
 662         return 0;
 663
 664 err_out_free_irq:
 665         free_irq(netdev->irq, netdev);
 666 err_out:
 667         ibmveth_cleanup(adapter);
 668         napi_disable(&adapter->napi);
 669         return rc;
 670 }
 671
 672 static int ibmveth_close(struct net_device *netdev)
 673 {
 674         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 675         long lpar_rc;
 676
 677         netdev_dbg(netdev, "close starting\n");
 678
 679         napi_disable(&adapter->napi);
 680
 681         if (!adapter->pool_config)
 682                 netif_stop_queue(netdev);
 683
 684         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 685
 686         do {
 687                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 688         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 689
 690         if (lpar_rc != H_SUCCESS) {
 691                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 692                            "continuing with close\n", lpar_rc);
 693         }
 694
 695         free_irq(netdev->irq, netdev);
 696
 697         adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
 698                                                 4096 - 8);
 699
 700         ibmveth_cleanup(adapter);
 701
 702         netdev_dbg(netdev, "close complete\n");
 703
 704         return 0;
 705 }
 706
 707 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 708 {
 709         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 710                                 SUPPORTED_FIBRE);
 711         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 712                                 ADVERTISED_FIBRE);
 713         ethtool_cmd_speed_set(cmd, SPEED_1000);
 714         cmd->duplex = DUPLEX_FULL;
 715         cmd->port = PORT_FIBRE;
 716         cmd->phy_address = 0;
 717         cmd->transceiver = XCVR_INTERNAL;
 718         cmd->autoneg = AUTONEG_ENABLE;
 719         cmd->maxtxpkt = 0;
 720         cmd->maxrxpkt = 1;
 721         return 0;
 722 }
 723
 724 static void netdev_get_drvinfo(struct net_device *dev,
 725                                struct ethtool_drvinfo *info)
 726 {
 727         strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
 728         strncpy(info->version, ibmveth_driver_version,
 729                 sizeof(info->version) - 1);
 730 }
 731
 732 static u32 ibmveth_fix_features(struct net_device *dev, u32 features)
 733 {
 734         /*
 735          * Since the ibmveth firmware interface does not have the
 736          * concept of separate tx/rx checksum offload enable, if rx
 737          * checksum is disabled we also have to disable tx checksum
 738          * offload. Once we disable rx checksum offload, we are no
 739          * longer allowed to send tx buffers that are not properly
 740          * checksummed.
 741          */
 742
 743         if (!(features & NETIF_F_RXCSUM))
 744                 features &= ~NETIF_F_ALL_CSUM;
 745
 746         return features;
 747 }
 748
 749 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 750 {
 751         struct ibmveth_adapter *adapter = netdev_priv(dev);
 752         unsigned long set_attr, clr_attr, ret_attr;
 753         unsigned long set_attr6, clr_attr6;
 754         long ret, ret6;
 755         int rc1 = 0, rc2 = 0;
 756         int restart = 0;
 757
 758         if (netif_running(dev)) {
 759                 restart = 1;
 760                 adapter->pool_config = 1;
 761                 ibmveth_close(dev);
 762                 adapter->pool_config = 0;
 763         }
 764
 765         set_attr = 0;
 766         clr_attr = 0;
 767
 768         if (data) {
 769                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 770                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 771         } else {
 772                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 773                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 774         }
 775
 776         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 777
 778         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
 779             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
 780             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 781                 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 782                                          set_attr, &ret_attr);
 783
 784                 if (ret != H_SUCCESS) {
 785                         netdev_err(dev, "unable to change IPv4 checksum "
 786                                         "offload settings. %d rc=%ld\n",
 787                                         data, ret);
 788
 789                         ret = h_illan_attributes(adapter->vdev->unit_address,
 790                                                  set_attr, clr_attr, &ret_attr);
 791                 } else {
 792                         adapter->fw_ipv4_csum_support = data;
 793                 }
 794
 795                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 796                                          clr_attr6, set_attr6, &ret_attr);
 797
 798                 if (ret6 != H_SUCCESS) {
 799                         netdev_err(dev, "unable to change IPv6 checksum "
 800                                         "offload settings. %d rc=%ld\n",
 801                                         data, ret);
 802
 803                         ret = h_illan_attributes(adapter->vdev->unit_address,
 804                                                  set_attr6, clr_attr6,
 805                                                  &ret_attr);
 806                 } else
 807                         adapter->fw_ipv6_csum_support = data;
 808
 809                 if (ret != H_SUCCESS || ret6 != H_SUCCESS)
 810                         adapter->rx_csum = data;
 811                 else
 812                         rc1 = -EIO;
 813         } else {
 814                 rc1 = -EIO;
 815                 netdev_err(dev, "unable to change checksum offload settings."
 816                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 817                                      ret_attr);
 818         }
 819
 820         if (restart)
 821                 rc2 = ibmveth_open(dev);
 822
 823         return rc1 ? rc1 : rc2;
 824 }
 825
 826 static int ibmveth_set_features(struct net_device *dev, u32 features)
 827 {
 828         struct ibmveth_adapter *adapter = netdev_priv(dev);
 829         int rx_csum = !!(features & NETIF_F_RXCSUM);
 830         int rc;
 831
 832         if (rx_csum == adapter->rx_csum)
 833                 return 0;
 834
 835         rc = ibmveth_set_csum_offload(dev, rx_csum);
 836         if (rc && !adapter->rx_csum)
 837                 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
 838
 839         return rc;
 840 }
 841
 842 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 843 {
 844         int i;
 845
 846         if (stringset != ETH_SS_STATS)
 847                 return;
 848
 849         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 850                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 851 }
 852
 853 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 854 {
 855         switch (sset) {
 856         case ETH_SS_STATS:
 857                 return ARRAY_SIZE(ibmveth_stats);
 858         default:
 859                 return -EOPNOTSUPP;
 860         }
 861 }
 862
 863 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 864                                       struct ethtool_stats *stats, u64 *data)
 865 {
 866         int i;
 867         struct ibmveth_adapter *adapter = netdev_priv(dev);
 868
 869         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 870                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 871 }
 872
 873 static const struct ethtool_ops netdev_ethtool_ops = {
 874         .get_drvinfo            = netdev_get_drvinfo,
 875         .get_settings           = netdev_get_settings,
 876         .get_link               = ethtool_op_get_link,
 877         .get_strings            = ibmveth_get_strings,
 878         .get_sset_count         = ibmveth_get_sset_count,
 879         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 880 };
 881
 882 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 883 {
 884         return -EOPNOTSUPP;
 885 }
 886
 887 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 888
 889 static int ibmveth_send(struct ibmveth_adapter *adapter,
 890                         union ibmveth_buf_desc *descs)
 891 {
 892         unsigned long correlator;
 893         unsigned int retry_count;
 894         unsigned long ret;
 895
 896         /*
 897          * The retry count sets a maximum for the number of broadcast and
 898          * multicast destinations within the system.
 899          */
 900         retry_count = 1024;
 901         correlator = 0;
 902         do {
 903                 ret = h_send_logical_lan(adapter->vdev->unit_address,
 904                                              descs[0].desc, descs[1].desc,
 905                                              descs[2].desc, descs[3].desc,
 906                                              descs[4].desc, descs[5].desc,
 907                                              correlator, &correlator);
 908         } while ((ret == H_BUSY) && (retry_count--));
 909
 910         if (ret != H_SUCCESS && ret != H_DROPPED) {
 911                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
 912                            "with rc=%ld\n", ret);
 913                 return 1;
 914         }
 915
 916         return 0;
 917 }
 918
 919 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
 920                                       struct net_device *netdev)
 921 {
 922         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 923         unsigned int desc_flags;
 924         union ibmveth_buf_desc descs[6];
 925         int last, i;
 926         int force_bounce = 0;
 927
 928         /*
 929          * veth handles a maximum of 6 segments including the header, so
 930          * we have to linearize the skb if there are more than this.
 931          */
 932         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
 933                 netdev->stats.tx_dropped++;
 934                 goto out;
 935         }
 936
 937         /* veth can't checksum offload UDP */
 938         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 939             ((skb->protocol == htons(ETH_P_IP) &&
 940               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
 941              (skb->protocol == htons(ETH_P_IPV6) &&
 942               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
 943             skb_checksum_help(skb)) {
 944
 945                 netdev_err(netdev, "tx: failed to checksum packet\n");
 946                 netdev->stats.tx_dropped++;
 947                 goto out;
 948         }
 949
 950         desc_flags = IBMVETH_BUF_VALID;
 951
 952         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 953                 unsigned char *buf = skb_transport_header(skb) +
 954                                                 skb->csum_offset;
 955
 956                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
 957
 958                 /* Need to zero out the checksum */
 959                 buf[0] = 0;
 960                 buf[1] = 0;
 961         }
 962
 963 retry_bounce:
 964         memset(descs, 0, sizeof(descs));
 965
 966         /*
 967          * If a linear packet is below the rx threshold then
 968          * copy it into the static bounce buffer. This avoids the
 969          * cost of a TCE insert and remove.
 970          */
 971         if (force_bounce || (!skb_is_nonlinear(skb) &&
 972                                 (skb->len < tx_copybreak))) {
 973                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
 974                                           skb->len);
 975
 976                 descs[0].fields.flags_len = desc_flags | skb->len;
 977                 descs[0].fields.address = adapter->bounce_buffer_dma;
 978
 979                 if (ibmveth_send(adapter, descs)) {
 980                         adapter->tx_send_failed++;
 981                         netdev->stats.tx_dropped++;
 982                 } else {
 983                         netdev->stats.tx_packets++;
 984                         netdev->stats.tx_bytes += skb->len;
 985                 }
 986
 987                 goto out;
 988         }
 989
 990         /* Map the header */
 991         descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
 992                                                  skb_headlen(skb),
 993                                                  DMA_TO_DEVICE);
 994         if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
 995                 goto map_failed;
 996
 997         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
 998
 999         /* Map the frags */
1000         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1001                 unsigned long dma_addr;
1002                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1003
1004                 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1005                                         frag->page_offset, frag->size,
1006                                         DMA_TO_DEVICE);
1007
1008                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1009                         goto map_failed_frags;
1010
1011                 descs[i+1].fields.flags_len = desc_flags | frag->size;
1012                 descs[i+1].fields.address = dma_addr;
1013         }
1014
1015         if (ibmveth_send(adapter, descs)) {
1016                 adapter->tx_send_failed++;
1017                 netdev->stats.tx_dropped++;
1018         } else {
1019                 netdev->stats.tx_packets++;
1020                 netdev->stats.tx_bytes += skb->len;
1021         }
1022
1023         for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
1024                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1025                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1026                                DMA_TO_DEVICE);
1027
1028 out:
1029         dev_kfree_skb(skb);
1030         return NETDEV_TX_OK;
1031
1032 map_failed_frags:
1033         last = i+1;
1034         for (i = 0; i < last; i++)
1035                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1036                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1037                                DMA_TO_DEVICE);
1038
1039 map_failed:
1040         if (!firmware_has_feature(FW_FEATURE_CMO))
1041                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1042         adapter->tx_map_failed++;
1043         skb_linearize(skb);
1044         force_bounce = 1;
1045         goto retry_bounce;
1046 }
1047
1048 static int ibmveth_poll(struct napi_struct *napi, int budget)
1049 {
1050         struct ibmveth_adapter *adapter =
1051                         container_of(napi, struct ibmveth_adapter, napi);
1052         struct net_device *netdev = adapter->netdev;
1053         int frames_processed = 0;
1054         unsigned long lpar_rc;
1055
1056 restart_poll:
1057         do {
1058                 if (!ibmveth_rxq_pending_buffer(adapter))
1059                         break;
1060
1061                 smp_rmb();
1062                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1063                         wmb(); /* suggested by larson1 */
1064                         adapter->rx_invalid_buffer++;
1065                         netdev_dbg(netdev, "recycling invalid buffer\n");
1066                         ibmveth_rxq_recycle_buffer(adapter);
1067                 } else {
1068                         struct sk_buff *skb, *new_skb;
1069                         int length = ibmveth_rxq_frame_length(adapter);
1070                         int offset = ibmveth_rxq_frame_offset(adapter);
1071                         int csum_good = ibmveth_rxq_csum_good(adapter);
1072
1073                         skb = ibmveth_rxq_get_buffer(adapter);
1074
1075                         new_skb = NULL;
1076                         if (length < rx_copybreak)
1077                                 new_skb = netdev_alloc_skb(netdev, length);
1078
1079                         if (new_skb) {
1080                                 skb_copy_to_linear_data(new_skb,
1081                                                         skb->data + offset,
1082                                                         length);
1083                                 if (rx_flush)
1084                                         ibmveth_flush_buffer(skb->data,
1085                                                 length + offset);
1086                                 skb = new_skb;
1087                                 ibmveth_rxq_recycle_buffer(adapter);
1088                         } else {
1089                                 ibmveth_rxq_harvest_buffer(adapter);
1090                                 skb_reserve(skb, offset);
1091                         }
1092
1093                         skb_put(skb, length);
1094                         skb->protocol = eth_type_trans(skb, netdev);
1095
1096                         if (csum_good)
1097                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1098
1099                         netif_receive_skb(skb); /* send it up */
1100
1101                         netdev->stats.rx_packets++;
1102                         netdev->stats.rx_bytes += length;
1103                         frames_processed++;
1104                 }
1105         } while (frames_processed < budget);
1106
1107         ibmveth_replenish_task(adapter);
1108
1109         if (frames_processed < budget) {
1110                 /* We think we are done - reenable interrupts,
1111                  * then check once more to make sure we are done.
1112                  */
1113                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1114                                        VIO_IRQ_ENABLE);
1115
1116                 BUG_ON(lpar_rc != H_SUCCESS);
1117
1118                 napi_complete(napi);
1119
1120                 if (ibmveth_rxq_pending_buffer(adapter) &&
1121                     napi_reschedule(napi)) {
1122                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1123                                                VIO_IRQ_DISABLE);
1124                         goto restart_poll;
1125                 }
1126         }
1127
1128         return frames_processed;
1129 }
1130
1131 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1132 {
1133         struct net_device *netdev = dev_instance;
1134         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1135         unsigned long lpar_rc;
1136
1137         if (napi_schedule_prep(&adapter->napi)) {
1138                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1139                                        VIO_IRQ_DISABLE);
1140                 BUG_ON(lpar_rc != H_SUCCESS);
1141                 __napi_schedule(&adapter->napi);
1142         }
1143         return IRQ_HANDLED;
1144 }
1145
1146 static void ibmveth_set_multicast_list(struct net_device *netdev)
1147 {
1148         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1149         unsigned long lpar_rc;
1150
1151         if ((netdev->flags & IFF_PROMISC) ||
1152             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1153                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1154                                            IbmVethMcastEnableRecv |
1155                                            IbmVethMcastDisableFiltering,
1156                                            0);
1157                 if (lpar_rc != H_SUCCESS) {
1158                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1159                                    "entering promisc mode\n", lpar_rc);
1160                 }
1161         } else {
1162                 struct netdev_hw_addr *ha;
1163                 /* clear the filter table & disable filtering */
1164                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1165                                            IbmVethMcastEnableRecv |
1166                                            IbmVethMcastDisableFiltering |
1167                                            IbmVethMcastClearFilterTable,
1168                                            0);
1169                 if (lpar_rc != H_SUCCESS) {
1170                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1171                                    "attempting to clear filter table\n",
1172                                    lpar_rc);
1173                 }
1174                 /* add the addresses to the filter table */
1175                 netdev_for_each_mc_addr(ha, netdev) {
1176                         /* add the multicast address to the filter table */
1177                         unsigned long mcast_addr = 0;
1178                         memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1179                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1180                                                    IbmVethMcastAddFilter,
1181                                                    mcast_addr);
1182                         if (lpar_rc != H_SUCCESS) {
1183                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1184                                            "when adding an entry to the filter "
1185                                            "table\n", lpar_rc);
1186                         }
1187                 }
1188
1189                 /* re-enable filtering */
1190                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1191                                            IbmVethMcastEnableFiltering,
1192                                            0);
1193                 if (lpar_rc != H_SUCCESS) {
1194                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1195                                    "enabling filtering\n", lpar_rc);
1196                 }
1197         }
1198 }
1199
1200 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1201 {
1202         struct ibmveth_adapter *adapter = netdev_priv(dev);
1203         struct vio_dev *viodev = adapter->vdev;
1204         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1205         int i, rc;
1206         int need_restart = 0;
1207
1208         if (new_mtu < IBMVETH_MIN_MTU)
1209                 return -EINVAL;
1210
1211         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1212                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1213                         break;
1214
1215         if (i == IBMVETH_NUM_BUFF_POOLS)
1216                 return -EINVAL;
1217
1218         /* Deactivate all the buffer pools so that the next loop can activate
1219            only the buffer pools necessary to hold the new MTU */
1220         if (netif_running(adapter->netdev)) {
1221                 need_restart = 1;
1222                 adapter->pool_config = 1;
1223                 ibmveth_close(adapter->netdev);
1224                 adapter->pool_config = 0;
1225         }
1226
1227         /* Look for an active buffer pool that can hold the new MTU */
1228         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1229                 adapter->rx_buff_pool[i].active = 1;
1230
1231                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1232                         dev->mtu = new_mtu;
1233                         vio_cmo_set_dev_desired(viodev,
1234                                                 ibmveth_get_desired_dma
1235                                                 (viodev));
1236                         if (need_restart) {
1237                                 return ibmveth_open(adapter->netdev);
1238                         }
1239                         return 0;
1240                 }
1241         }
1242
1243         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1244                 return rc;
1245
1246         return -EINVAL;
1247 }
1248
1249 #ifdef CONFIG_NET_POLL_CONTROLLER
1250 static void ibmveth_poll_controller(struct net_device *dev)
1251 {
1252         ibmveth_replenish_task(netdev_priv(dev));
1253         ibmveth_interrupt(dev->irq, dev);
1254 }
1255 #endif
1256
1257 /**
1258  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1259  *
1260  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1261  *
1262  * Return value:
1263  *      Number of bytes of IO data the driver will need to perform well.
1264  */
1265 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1266 {
1267         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1268         struct ibmveth_adapter *adapter;
1269         unsigned long ret;
1270         int i;
1271         int rxqentries = 1;
1272
1273         /* netdev inits at probe time along with the structures we need below*/
1274         if (netdev == NULL)
1275                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1276
1277         adapter = netdev_priv(netdev);
1278
1279         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1280         ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1281
1282         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1283                 /* add the size of the active receive buffers */
1284                 if (adapter->rx_buff_pool[i].active)
1285                         ret +=
1286                             adapter->rx_buff_pool[i].size *
1287                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1288                                     buff_size);
1289                 rxqentries += adapter->rx_buff_pool[i].size;
1290         }
1291         /* add the size of the receive queue entries */
1292         ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1293
1294         return ret;
1295 }
1296
1297 static const struct net_device_ops ibmveth_netdev_ops = {
1298         .ndo_open               = ibmveth_open,
1299         .ndo_stop               = ibmveth_close,
1300         .ndo_start_xmit         = ibmveth_start_xmit,
1301         .ndo_set_multicast_list = ibmveth_set_multicast_list,
1302         .ndo_do_ioctl           = ibmveth_ioctl,
1303         .ndo_change_mtu         = ibmveth_change_mtu,
1304         .ndo_fix_features       = ibmveth_fix_features,
1305         .ndo_set_features       = ibmveth_set_features,
1306         .ndo_validate_addr      = eth_validate_addr,
1307         .ndo_set_mac_address    = eth_mac_addr,
1308 #ifdef CONFIG_NET_POLL_CONTROLLER
1309         .ndo_poll_controller    = ibmveth_poll_controller,
1310 #endif
1311 };
1312
1313 static int __devinit ibmveth_probe(struct vio_dev *dev,
1314                                    const struct vio_device_id *id)
1315 {
1316         int rc, i;
1317         struct net_device *netdev;
1318         struct ibmveth_adapter *adapter;
1319         unsigned char *mac_addr_p;
1320         unsigned int *mcastFilterSize_p;
1321
1322         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1323                 dev->unit_address);
1324
1325         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1326                                                         NULL);
1327         if (!mac_addr_p) {
1328                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1329                 return -EINVAL;
1330         }
1331
1332         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1333                                                 VETH_MCAST_FILTER_SIZE, NULL);
1334         if (!mcastFilterSize_p) {
1335                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1336                         "attribute\n");
1337                 return -EINVAL;
1338         }
1339
1340         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1341
1342         if (!netdev)
1343                 return -ENOMEM;
1344
1345         adapter = netdev_priv(netdev);
1346         dev_set_drvdata(&dev->dev, netdev);
1347
1348         adapter->vdev = dev;
1349         adapter->netdev = netdev;
1350         adapter->mcastFilterSize = *mcastFilterSize_p;
1351         adapter->pool_config = 0;
1352
1353         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1354
1355         /*
1356          * Some older boxes running PHYP non-natively have an OF that returns
1357          * a 8-byte local-mac-address field (and the first 2 bytes have to be
1358          * ignored) while newer boxes' OF return a 6-byte field. Note that
1359          * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1360          * The RPA doc specifies that the first byte must be 10b, so we'll
1361          * just look for it to solve this 8 vs. 6 byte field issue
1362          */
1363         if ((*mac_addr_p & 0x3) != 0x02)
1364                 mac_addr_p += 2;
1365
1366         adapter->mac_addr = 0;
1367         memcpy(&adapter->mac_addr, mac_addr_p, 6);
1368
1369         netdev->irq = dev->irq;
1370         netdev->netdev_ops = &ibmveth_netdev_ops;
1371         netdev->ethtool_ops = &netdev_ethtool_ops;
1372         SET_NETDEV_DEV(netdev, &dev->dev);
1373         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1374                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1375         netdev->features |= netdev->hw_features;
1376
1377         memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1378
1379         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1380                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1381                 int error;
1382
1383                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1384                                          pool_count[i], pool_size[i],
1385                                          pool_active[i]);
1386                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1387                                              &dev->dev.kobj, "pool%d", i);
1388                 if (!error)
1389                         kobject_uevent(kobj, KOBJ_ADD);
1390         }
1391
1392         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1393
1394         adapter->buffer_list_dma = DMA_ERROR_CODE;
1395         adapter->filter_list_dma = DMA_ERROR_CODE;
1396         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1397
1398         netdev_dbg(netdev, "registering netdev...\n");
1399
1400         ibmveth_set_features(netdev, netdev->features);
1401
1402         rc = register_netdev(netdev);
1403
1404         if (rc) {
1405                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1406                 free_netdev(netdev);
1407                 return rc;
1408         }
1409
1410         netdev_dbg(netdev, "registered\n");
1411
1412         return 0;
1413 }
1414
1415 static int __devexit ibmveth_remove(struct vio_dev *dev)
1416 {
1417         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1418         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1419         int i;
1420
1421         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1422                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1423
1424         unregister_netdev(netdev);
1425
1426         free_netdev(netdev);
1427         dev_set_drvdata(&dev->dev, NULL);
1428
1429         return 0;
1430 }
1431
1432 static struct attribute veth_active_attr;
1433 static struct attribute veth_num_attr;
1434 static struct attribute veth_size_attr;
1435
1436 static ssize_t veth_pool_show(struct kobject *kobj,
1437                               struct attribute *attr, char *buf)
1438 {
1439         struct ibmveth_buff_pool *pool = container_of(kobj,
1440                                                       struct ibmveth_buff_pool,
1441                                                       kobj);
1442
1443         if (attr == &veth_active_attr)
1444                 return sprintf(buf, "%d\n", pool->active);
1445         else if (attr == &veth_num_attr)
1446                 return sprintf(buf, "%d\n", pool->size);
1447         else if (attr == &veth_size_attr)
1448                 return sprintf(buf, "%d\n", pool->buff_size);
1449         return 0;
1450 }
1451
1452 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1453                                const char *buf, size_t count)
1454 {
1455         struct ibmveth_buff_pool *pool = container_of(kobj,
1456                                                       struct ibmveth_buff_pool,
1457                                                       kobj);
1458         struct net_device *netdev = dev_get_drvdata(
1459             container_of(kobj->parent, struct device, kobj));
1460         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1461         long value = simple_strtol(buf, NULL, 10);
1462         long rc;
1463
1464         if (attr == &veth_active_attr) {
1465                 if (value && !pool->active) {
1466                         if (netif_running(netdev)) {
1467                                 if (ibmveth_alloc_buffer_pool(pool)) {
1468                                         netdev_err(netdev,
1469                                                    "unable to alloc pool\n");
1470                                         return -ENOMEM;
1471                                 }
1472                                 pool->active = 1;
1473                                 adapter->pool_config = 1;
1474                                 ibmveth_close(netdev);
1475                                 adapter->pool_config = 0;
1476                                 if ((rc = ibmveth_open(netdev)))
1477                                         return rc;
1478                         } else {
1479                                 pool->active = 1;
1480                         }
1481                 } else if (!value && pool->active) {
1482                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1483                         int i;
1484                         /* Make sure there is a buffer pool with buffers that
1485                            can hold a packet of the size of the MTU */
1486                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1487                                 if (pool == &adapter->rx_buff_pool[i])
1488                                         continue;
1489                                 if (!adapter->rx_buff_pool[i].active)
1490                                         continue;
1491                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1492                                         break;
1493                         }
1494
1495                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1496                                 netdev_err(netdev, "no active pool >= MTU\n");
1497                                 return -EPERM;
1498                         }
1499
1500                         if (netif_running(netdev)) {
1501                                 adapter->pool_config = 1;
1502                                 ibmveth_close(netdev);
1503                                 pool->active = 0;
1504                                 adapter->pool_config = 0;
1505                                 if ((rc = ibmveth_open(netdev)))
1506                                         return rc;
1507                         }
1508                         pool->active = 0;
1509                 }
1510         } else if (attr == &veth_num_attr) {
1511                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1512                         return -EINVAL;
1513                 } else {
1514                         if (netif_running(netdev)) {
1515                                 adapter->pool_config = 1;
1516                                 ibmveth_close(netdev);
1517                                 adapter->pool_config = 0;
1518                                 pool->size = value;
1519                                 if ((rc = ibmveth_open(netdev)))
1520                                         return rc;
1521                         } else {
1522                                 pool->size = value;
1523                         }
1524                 }
1525         } else if (attr == &veth_size_attr) {
1526                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1527                         return -EINVAL;
1528                 } else {
1529                         if (netif_running(netdev)) {
1530                                 adapter->pool_config = 1;
1531                                 ibmveth_close(netdev);
1532                                 adapter->pool_config = 0;
1533                                 pool->buff_size = value;
1534                                 if ((rc = ibmveth_open(netdev)))
1535                                         return rc;
1536                         } else {
1537                                 pool->buff_size = value;
1538                         }
1539                 }
1540         }
1541
1542         /* kick the interrupt handler to allocate/deallocate pools */
1543         ibmveth_interrupt(netdev->irq, netdev);
1544         return count;
1545 }
1546
1547
1548 #define ATTR(_name, _mode)                              \
1549         struct attribute veth_##_name##_attr = {        \
1550         .name = __stringify(_name), .mode = _mode,      \
1551         };
1552
1553 static ATTR(active, 0644);
1554 static ATTR(num, 0644);
1555 static ATTR(size, 0644);
1556
1557 static struct attribute *veth_pool_attrs[] = {
1558         &veth_active_attr,
1559         &veth_num_attr,
1560         &veth_size_attr,
1561         NULL,
1562 };
1563
1564 static const struct sysfs_ops veth_pool_ops = {
1565         .show   = veth_pool_show,
1566         .store  = veth_pool_store,
1567 };
1568
1569 static struct kobj_type ktype_veth_pool = {
1570         .release        = NULL,
1571         .sysfs_ops      = &veth_pool_ops,
1572         .default_attrs  = veth_pool_attrs,
1573 };
1574
1575 static int ibmveth_resume(struct device *dev)
1576 {
1577         struct net_device *netdev = dev_get_drvdata(dev);
1578         ibmveth_interrupt(netdev->irq, netdev);
1579         return 0;
1580 }
1581
1582 static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1583         { "network", "IBM,l-lan"},
1584         { "", "" }
1585 };
1586 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1587
1588 static struct dev_pm_ops ibmveth_pm_ops = {
1589         .resume = ibmveth_resume
1590 };
1591
1592 static struct vio_driver ibmveth_driver = {
1593         .id_table       = ibmveth_device_table,
1594         .probe          = ibmveth_probe,
1595         .remove         = ibmveth_remove,
1596         .get_desired_dma = ibmveth_get_desired_dma,
1597         .driver         = {
1598                 .name   = ibmveth_driver_name,
1599                 .owner  = THIS_MODULE,
1600                 .pm = &ibmveth_pm_ops,
1601         }
1602 };
1603
1604 static int __init ibmveth_module_init(void)
1605 {
1606         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1607                ibmveth_driver_string, ibmveth_driver_version);
1608
1609         return vio_register_driver(&ibmveth_driver);
1610 }
1611
1612 static void __exit ibmveth_module_exit(void)
1613 {
1614         vio_unregister_driver(&ibmveth_driver);
1615 }
1616
1617 module_init(ibmveth_module_init);
1618 module_exit(ibmveth_module_exit);