drivers/net/ethernet/ibm/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, see <http://www.gnu.org/licenses/>.
  16  *
  17  * Copyright (C) IBM Corporation, 2003, 2010
  18  *
  19  * Authors: Dave Larson <[email protected]>
  20  *          Santiago Leon <[email protected]>
  21  *          Brian King <[email protected]>
  22  *          Robert Jennings <[email protected]>
  23  *          Anton Blanchard <[email protected]>
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/types.h>
  29 #include <linux/errno.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/kernel.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/init.h>
  36 #include <linux/interrupt.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 <linux/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 <[email protected]>");
  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 be32_to_cpu(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 be32_to_cpu(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 int 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         int ret = 1;
 406
 407         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 408         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 409
 410         if (!adapter->rx_buff_pool[pool].active) {
 411                 ibmveth_rxq_harvest_buffer(adapter);
 412                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 413                 goto out;
 414         }
 415
 416         desc.fields.flags_len = IBMVETH_BUF_VALID |
 417                 adapter->rx_buff_pool[pool].buff_size;
 418         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 419
 420         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 421
 422         if (lpar_rc != H_SUCCESS) {
 423                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 424                            "during recycle rc=%ld", lpar_rc);
 425                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 426                 ret = 0;
 427         }
 428
 429         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 430                 adapter->rx_queue.index = 0;
 431                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 432         }
 433
 434 out:
 435         return ret;
 436 }
 437
 438 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 439 {
 440         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 441
 442         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 443                 adapter->rx_queue.index = 0;
 444                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 445         }
 446 }
 447
 448 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 449 {
 450         int i;
 451         struct device *dev = &adapter->vdev->dev;
 452
 453         if (adapter->buffer_list_addr != NULL) {
 454                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
 455                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 456                                         DMA_BIDIRECTIONAL);
 457                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 458                 }
 459                 free_page((unsigned long)adapter->buffer_list_addr);
 460                 adapter->buffer_list_addr = NULL;
 461         }
 462
 463         if (adapter->filter_list_addr != NULL) {
 464                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
 465                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 466                                         DMA_BIDIRECTIONAL);
 467                         adapter->filter_list_dma = DMA_ERROR_CODE;
 468                 }
 469                 free_page((unsigned long)adapter->filter_list_addr);
 470                 adapter->filter_list_addr = NULL;
 471         }
 472
 473         if (adapter->rx_queue.queue_addr != NULL) {
 474                 dma_free_coherent(dev, adapter->rx_queue.queue_len,
 475                                   adapter->rx_queue.queue_addr,
 476                                   adapter->rx_queue.queue_dma);
 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 u64 ibmveth_encode_mac_addr(u8 *mac)
 526 {
 527         int i;
 528         u64 encoded = 0;
 529
 530         for (i = 0; i < ETH_ALEN; i++)
 531                 encoded = (encoded << 8) | mac[i];
 532
 533         return encoded;
 534 }
 535
 536 static int ibmveth_open(struct net_device *netdev)
 537 {
 538         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 539         u64 mac_address;
 540         int rxq_entries = 1;
 541         unsigned long lpar_rc;
 542         int rc;
 543         union ibmveth_buf_desc rxq_desc;
 544         int i;
 545         struct device *dev;
 546
 547         netdev_dbg(netdev, "open starting\n");
 548
 549         napi_enable(&adapter->napi);
 550
 551         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 552                 rxq_entries += adapter->rx_buff_pool[i].size;
 553
 554         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 555         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 556
 557         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 558                 netdev_err(netdev, "unable to allocate filter or buffer list "
 559                            "pages\n");
 560                 rc = -ENOMEM;
 561                 goto err_out;
 562         }
 563
 564         dev = &adapter->vdev->dev;
 565
 566         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 567                                                 rxq_entries;
 568         adapter->rx_queue.queue_addr =
 569                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 570                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 571         if (!adapter->rx_queue.queue_addr) {
 572                 rc = -ENOMEM;
 573                 goto err_out;
 574         }
 575
 576         adapter->buffer_list_dma = dma_map_single(dev,
 577                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 578         adapter->filter_list_dma = dma_map_single(dev,
 579                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 580
 581         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
 582             (dma_mapping_error(dev, adapter->filter_list_dma))) {
 583                 netdev_err(netdev, "unable to map filter or buffer list "
 584                            "pages\n");
 585                 rc = -ENOMEM;
 586                 goto err_out;
 587         }
 588
 589         adapter->rx_queue.index = 0;
 590         adapter->rx_queue.num_slots = rxq_entries;
 591         adapter->rx_queue.toggle = 1;
 592
 593         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 594
 595         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 596                                         adapter->rx_queue.queue_len;
 597         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 598
 599         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 600         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 601         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 602
 603         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 604
 605         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 606
 607         if (lpar_rc != H_SUCCESS) {
 608                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 609                            lpar_rc);
 610                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 611                            "desc:0x%llx MAC:0x%llx\n",
 612                                      adapter->buffer_list_dma,
 613                                      adapter->filter_list_dma,
 614                                      rxq_desc.desc,
 615                                      mac_address);
 616                 rc = -ENONET;
 617                 goto err_out;
 618         }
 619
 620         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 621                 if (!adapter->rx_buff_pool[i].active)
 622                         continue;
 623                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 624                         netdev_err(netdev, "unable to alloc pool\n");
 625                         adapter->rx_buff_pool[i].active = 0;
 626                         rc = -ENOMEM;
 627                         goto err_out;
 628                 }
 629         }
 630
 631         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 632         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 633                          netdev);
 634         if (rc != 0) {
 635                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 636                            netdev->irq, rc);
 637                 do {
 638                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 639                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 640
 641                 goto err_out;
 642         }
 643
 644         adapter->bounce_buffer =
 645             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 646         if (!adapter->bounce_buffer) {
 647                 rc = -ENOMEM;
 648                 goto err_out_free_irq;
 649         }
 650         adapter->bounce_buffer_dma =
 651             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 652                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 653         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 654                 netdev_err(netdev, "unable to map bounce buffer\n");
 655                 rc = -ENOMEM;
 656                 goto err_out_free_irq;
 657         }
 658
 659         netdev_dbg(netdev, "initial replenish cycle\n");
 660         ibmveth_interrupt(netdev->irq, netdev);
 661
 662         netif_start_queue(netdev);
 663
 664         netdev_dbg(netdev, "open complete\n");
 665
 666         return 0;
 667
 668 err_out_free_irq:
 669         free_irq(netdev->irq, netdev);
 670 err_out:
 671         ibmveth_cleanup(adapter);
 672         napi_disable(&adapter->napi);
 673         return rc;
 674 }
 675
 676 static int ibmveth_close(struct net_device *netdev)
 677 {
 678         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 679         long lpar_rc;
 680
 681         netdev_dbg(netdev, "close starting\n");
 682
 683         napi_disable(&adapter->napi);
 684
 685         if (!adapter->pool_config)
 686                 netif_stop_queue(netdev);
 687
 688         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 689
 690         do {
 691                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 692         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 693
 694         if (lpar_rc != H_SUCCESS) {
 695                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 696                            "continuing with close\n", lpar_rc);
 697         }
 698
 699         free_irq(netdev->irq, netdev);
 700
 701         adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
 702                                                 4096 - 8);
 703
 704         ibmveth_cleanup(adapter);
 705
 706         netdev_dbg(netdev, "close complete\n");
 707
 708         return 0;
 709 }
 710
 711 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 712 {
 713         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 714                                 SUPPORTED_FIBRE);
 715         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 716                                 ADVERTISED_FIBRE);
 717         ethtool_cmd_speed_set(cmd, SPEED_1000);
 718         cmd->duplex = DUPLEX_FULL;
 719         cmd->port = PORT_FIBRE;
 720         cmd->phy_address = 0;
 721         cmd->transceiver = XCVR_INTERNAL;
 722         cmd->autoneg = AUTONEG_ENABLE;
 723         cmd->maxtxpkt = 0;
 724         cmd->maxrxpkt = 1;
 725         return 0;
 726 }
 727
 728 static void netdev_get_drvinfo(struct net_device *dev,
 729                                struct ethtool_drvinfo *info)
 730 {
 731         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 732         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
 733 }
 734
 735 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 736         netdev_features_t features)
 737 {
 738         /*
 739          * Since the ibmveth firmware interface does not have the
 740          * concept of separate tx/rx checksum offload enable, if rx
 741          * checksum is disabled we also have to disable tx checksum
 742          * offload. Once we disable rx checksum offload, we are no
 743          * longer allowed to send tx buffers that are not properly
 744          * checksummed.
 745          */
 746
 747         if (!(features & NETIF_F_RXCSUM))
 748                 features &= ~NETIF_F_ALL_CSUM;
 749
 750         return features;
 751 }
 752
 753 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 754 {
 755         struct ibmveth_adapter *adapter = netdev_priv(dev);
 756         unsigned long set_attr, clr_attr, ret_attr;
 757         unsigned long set_attr6, clr_attr6;
 758         long ret, ret4, ret6;
 759         int rc1 = 0, rc2 = 0;
 760         int restart = 0;
 761
 762         if (netif_running(dev)) {
 763                 restart = 1;
 764                 adapter->pool_config = 1;
 765                 ibmveth_close(dev);
 766                 adapter->pool_config = 0;
 767         }
 768
 769         set_attr = 0;
 770         clr_attr = 0;
 771         set_attr6 = 0;
 772         clr_attr6 = 0;
 773
 774         if (data) {
 775                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 776                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 777         } else {
 778                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 779                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 780         }
 781
 782         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 783
 784         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
 785             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
 786             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 787                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 788                                          set_attr, &ret_attr);
 789
 790                 if (ret4 != H_SUCCESS) {
 791                         netdev_err(dev, "unable to change IPv4 checksum "
 792                                         "offload settings. %d rc=%ld\n",
 793                                         data, ret4);
 794
 795                         h_illan_attributes(adapter->vdev->unit_address,
 796                                            set_attr, clr_attr, &ret_attr);
 797
 798                         if (data == 1)
 799                                 dev->features &= ~NETIF_F_IP_CSUM;
 800
 801                 } else {
 802                         adapter->fw_ipv4_csum_support = data;
 803                 }
 804
 805                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 806                                          clr_attr6, set_attr6, &ret_attr);
 807
 808                 if (ret6 != H_SUCCESS) {
 809                         netdev_err(dev, "unable to change IPv6 checksum "
 810                                         "offload settings. %d rc=%ld\n",
 811                                         data, ret6);
 812
 813                         h_illan_attributes(adapter->vdev->unit_address,
 814                                            set_attr6, clr_attr6, &ret_attr);
 815
 816                         if (data == 1)
 817                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 818
 819                 } else
 820                         adapter->fw_ipv6_csum_support = data;
 821
 822                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 823                         adapter->rx_csum = data;
 824                 else
 825                         rc1 = -EIO;
 826         } else {
 827                 rc1 = -EIO;
 828                 netdev_err(dev, "unable to change checksum offload settings."
 829                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 830                                      ret_attr);
 831         }
 832
 833         if (restart)
 834                 rc2 = ibmveth_open(dev);
 835
 836         return rc1 ? rc1 : rc2;
 837 }
 838
 839 static int ibmveth_set_features(struct net_device *dev,
 840         netdev_features_t features)
 841 {
 842         struct ibmveth_adapter *adapter = netdev_priv(dev);
 843         int rx_csum = !!(features & NETIF_F_RXCSUM);
 844         int rc;
 845
 846         if (rx_csum == adapter->rx_csum)
 847                 return 0;
 848
 849         rc = ibmveth_set_csum_offload(dev, rx_csum);
 850         if (rc && !adapter->rx_csum)
 851                 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
 852
 853         return rc;
 854 }
 855
 856 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 857 {
 858         int i;
 859
 860         if (stringset != ETH_SS_STATS)
 861                 return;
 862
 863         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 864                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 865 }
 866
 867 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 868 {
 869         switch (sset) {
 870         case ETH_SS_STATS:
 871                 return ARRAY_SIZE(ibmveth_stats);
 872         default:
 873                 return -EOPNOTSUPP;
 874         }
 875 }
 876
 877 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 878                                       struct ethtool_stats *stats, u64 *data)
 879 {
 880         int i;
 881         struct ibmveth_adapter *adapter = netdev_priv(dev);
 882
 883         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 884                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 885 }
 886
 887 static const struct ethtool_ops netdev_ethtool_ops = {
 888         .get_drvinfo            = netdev_get_drvinfo,
 889         .get_settings           = netdev_get_settings,
 890         .get_link               = ethtool_op_get_link,
 891         .get_strings            = ibmveth_get_strings,
 892         .get_sset_count         = ibmveth_get_sset_count,
 893         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 894 };
 895
 896 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 897 {
 898         return -EOPNOTSUPP;
 899 }
 900
 901 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 902
 903 static int ibmveth_send(struct ibmveth_adapter *adapter,
 904                         union ibmveth_buf_desc *descs)
 905 {
 906         unsigned long correlator;
 907         unsigned int retry_count;
 908         unsigned long ret;
 909
 910         /*
 911          * The retry count sets a maximum for the number of broadcast and
 912          * multicast destinations within the system.
 913          */
 914         retry_count = 1024;
 915         correlator = 0;
 916         do {
 917                 ret = h_send_logical_lan(adapter->vdev->unit_address,
 918                                              descs[0].desc, descs[1].desc,
 919                                              descs[2].desc, descs[3].desc,
 920                                              descs[4].desc, descs[5].desc,
 921                                              correlator, &correlator);
 922         } while ((ret == H_BUSY) && (retry_count--));
 923
 924         if (ret != H_SUCCESS && ret != H_DROPPED) {
 925                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
 926                            "with rc=%ld\n", ret);
 927                 return 1;
 928         }
 929
 930         return 0;
 931 }
 932
 933 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
 934                                       struct net_device *netdev)
 935 {
 936         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 937         unsigned int desc_flags;
 938         union ibmveth_buf_desc descs[6];
 939         int last, i;
 940         int force_bounce = 0;
 941         dma_addr_t dma_addr;
 942
 943         /*
 944          * veth handles a maximum of 6 segments including the header, so
 945          * we have to linearize the skb if there are more than this.
 946          */
 947         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
 948                 netdev->stats.tx_dropped++;
 949                 goto out;
 950         }
 951
 952         /* veth can't checksum offload UDP */
 953         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 954             ((skb->protocol == htons(ETH_P_IP) &&
 955               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
 956              (skb->protocol == htons(ETH_P_IPV6) &&
 957               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
 958             skb_checksum_help(skb)) {
 959
 960                 netdev_err(netdev, "tx: failed to checksum packet\n");
 961                 netdev->stats.tx_dropped++;
 962                 goto out;
 963         }
 964
 965         desc_flags = IBMVETH_BUF_VALID;
 966
 967         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 968                 unsigned char *buf = skb_transport_header(skb) +
 969                                                 skb->csum_offset;
 970
 971                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
 972
 973                 /* Need to zero out the checksum */
 974                 buf[0] = 0;
 975                 buf[1] = 0;
 976         }
 977
 978 retry_bounce:
 979         memset(descs, 0, sizeof(descs));
 980
 981         /*
 982          * If a linear packet is below the rx threshold then
 983          * copy it into the static bounce buffer. This avoids the
 984          * cost of a TCE insert and remove.
 985          */
 986         if (force_bounce || (!skb_is_nonlinear(skb) &&
 987                                 (skb->len < tx_copybreak))) {
 988                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
 989                                           skb->len);
 990
 991                 descs[0].fields.flags_len = desc_flags | skb->len;
 992                 descs[0].fields.address = adapter->bounce_buffer_dma;
 993
 994                 if (ibmveth_send(adapter, descs)) {
 995                         adapter->tx_send_failed++;
 996                         netdev->stats.tx_dropped++;
 997                 } else {
 998                         netdev->stats.tx_packets++;
 999                         netdev->stats.tx_bytes += skb->len;
1000                 }
1001
1002                 goto out;
1003         }
1004
1005         /* Map the header */
1006         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1007                                   skb_headlen(skb), DMA_TO_DEVICE);
1008         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1009                 goto map_failed;
1010
1011         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1012         descs[0].fields.address = dma_addr;
1013
1014         /* Map the frags */
1015         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1016                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1017
1018                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1019                                             skb_frag_size(frag), DMA_TO_DEVICE);
1020
1021                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1022                         goto map_failed_frags;
1023
1024                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1025                 descs[i+1].fields.address = dma_addr;
1026         }
1027
1028         if (ibmveth_send(adapter, descs)) {
1029                 adapter->tx_send_failed++;
1030                 netdev->stats.tx_dropped++;
1031         } else {
1032                 netdev->stats.tx_packets++;
1033                 netdev->stats.tx_bytes += skb->len;
1034         }
1035
1036         dma_unmap_single(&adapter->vdev->dev,
1037                          descs[0].fields.address,
1038                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1039                          DMA_TO_DEVICE);
1040
1041         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1042                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1043                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1044                                DMA_TO_DEVICE);
1045
1046 out:
1047         dev_consume_skb_any(skb);
1048         return NETDEV_TX_OK;
1049
1050 map_failed_frags:
1051         last = i+1;
1052         for (i = 0; i < last; i++)
1053                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1054                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1055                                DMA_TO_DEVICE);
1056
1057 map_failed:
1058         if (!firmware_has_feature(FW_FEATURE_CMO))
1059                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1060         adapter->tx_map_failed++;
1061         skb_linearize(skb);
1062         force_bounce = 1;
1063         goto retry_bounce;
1064 }
1065
1066 static int ibmveth_poll(struct napi_struct *napi, int budget)
1067 {
1068         struct ibmveth_adapter *adapter =
1069                         container_of(napi, struct ibmveth_adapter, napi);
1070         struct net_device *netdev = adapter->netdev;
1071         int frames_processed = 0;
1072         unsigned long lpar_rc;
1073
1074 restart_poll:
1075         while (frames_processed < budget) {
1076                 if (!ibmveth_rxq_pending_buffer(adapter))
1077                         break;
1078
1079                 smp_rmb();
1080                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1081                         wmb(); /* suggested by larson1 */
1082                         adapter->rx_invalid_buffer++;
1083                         netdev_dbg(netdev, "recycling invalid buffer\n");
1084                         ibmveth_rxq_recycle_buffer(adapter);
1085                 } else {
1086                         struct sk_buff *skb, *new_skb;
1087                         int length = ibmveth_rxq_frame_length(adapter);
1088                         int offset = ibmveth_rxq_frame_offset(adapter);
1089                         int csum_good = ibmveth_rxq_csum_good(adapter);
1090
1091                         skb = ibmveth_rxq_get_buffer(adapter);
1092
1093                         new_skb = NULL;
1094                         if (length < rx_copybreak)
1095                                 new_skb = netdev_alloc_skb(netdev, length);
1096
1097                         if (new_skb) {
1098                                 skb_copy_to_linear_data(new_skb,
1099                                                         skb->data + offset,
1100                                                         length);
1101                                 if (rx_flush)
1102                                         ibmveth_flush_buffer(skb->data,
1103                                                 length + offset);
1104                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1105                                         kfree_skb(skb);
1106                                 skb = new_skb;
1107                         } else {
1108                                 ibmveth_rxq_harvest_buffer(adapter);
1109                                 skb_reserve(skb, offset);
1110                         }
1111
1112                         skb_put(skb, length);
1113                         skb->protocol = eth_type_trans(skb, netdev);
1114
1115                         if (csum_good)
1116                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1117
1118                         netif_receive_skb(skb); /* send it up */
1119
1120                         netdev->stats.rx_packets++;
1121                         netdev->stats.rx_bytes += length;
1122                         frames_processed++;
1123                 }
1124         }
1125
1126         ibmveth_replenish_task(adapter);
1127
1128         if (frames_processed < budget) {
1129                 /* We think we are done - reenable interrupts,
1130                  * then check once more to make sure we are done.
1131                  */
1132                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1133                                        VIO_IRQ_ENABLE);
1134
1135                 BUG_ON(lpar_rc != H_SUCCESS);
1136
1137                 napi_complete(napi);
1138
1139                 if (ibmveth_rxq_pending_buffer(adapter) &&
1140                     napi_reschedule(napi)) {
1141                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1142                                                VIO_IRQ_DISABLE);
1143                         goto restart_poll;
1144                 }
1145         }
1146
1147         return frames_processed;
1148 }
1149
1150 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1151 {
1152         struct net_device *netdev = dev_instance;
1153         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1154         unsigned long lpar_rc;
1155
1156         if (napi_schedule_prep(&adapter->napi)) {
1157                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1158                                        VIO_IRQ_DISABLE);
1159                 BUG_ON(lpar_rc != H_SUCCESS);
1160                 __napi_schedule(&adapter->napi);
1161         }
1162         return IRQ_HANDLED;
1163 }
1164
1165 static void ibmveth_set_multicast_list(struct net_device *netdev)
1166 {
1167         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1168         unsigned long lpar_rc;
1169
1170         if ((netdev->flags & IFF_PROMISC) ||
1171             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1172                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1173                                            IbmVethMcastEnableRecv |
1174                                            IbmVethMcastDisableFiltering,
1175                                            0);
1176                 if (lpar_rc != H_SUCCESS) {
1177                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1178                                    "entering promisc mode\n", lpar_rc);
1179                 }
1180         } else {
1181                 struct netdev_hw_addr *ha;
1182                 /* clear the filter table & disable filtering */
1183                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1184                                            IbmVethMcastEnableRecv |
1185                                            IbmVethMcastDisableFiltering |
1186                                            IbmVethMcastClearFilterTable,
1187                                            0);
1188                 if (lpar_rc != H_SUCCESS) {
1189                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1190                                    "attempting to clear filter table\n",
1191                                    lpar_rc);
1192                 }
1193                 /* add the addresses to the filter table */
1194                 netdev_for_each_mc_addr(ha, netdev) {
1195                         /* add the multicast address to the filter table */
1196                         u64 mcast_addr;
1197                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1198                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1199                                                    IbmVethMcastAddFilter,
1200                                                    mcast_addr);
1201                         if (lpar_rc != H_SUCCESS) {
1202                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1203                                            "when adding an entry to the filter "
1204                                            "table\n", lpar_rc);
1205                         }
1206                 }
1207
1208                 /* re-enable filtering */
1209                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1210                                            IbmVethMcastEnableFiltering,
1211                                            0);
1212                 if (lpar_rc != H_SUCCESS) {
1213                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1214                                    "enabling filtering\n", lpar_rc);
1215                 }
1216         }
1217 }
1218
1219 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1220 {
1221         struct ibmveth_adapter *adapter = netdev_priv(dev);
1222         struct vio_dev *viodev = adapter->vdev;
1223         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1224         int i, rc;
1225         int need_restart = 0;
1226
1227         if (new_mtu < IBMVETH_MIN_MTU)
1228                 return -EINVAL;
1229
1230         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1231                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1232                         break;
1233
1234         if (i == IBMVETH_NUM_BUFF_POOLS)
1235                 return -EINVAL;
1236
1237         /* Deactivate all the buffer pools so that the next loop can activate
1238            only the buffer pools necessary to hold the new MTU */
1239         if (netif_running(adapter->netdev)) {
1240                 need_restart = 1;
1241                 adapter->pool_config = 1;
1242                 ibmveth_close(adapter->netdev);
1243                 adapter->pool_config = 0;
1244         }
1245
1246         /* Look for an active buffer pool that can hold the new MTU */
1247         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1248                 adapter->rx_buff_pool[i].active = 1;
1249
1250                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1251                         dev->mtu = new_mtu;
1252                         vio_cmo_set_dev_desired(viodev,
1253                                                 ibmveth_get_desired_dma
1254                                                 (viodev));
1255                         if (need_restart) {
1256                                 return ibmveth_open(adapter->netdev);
1257                         }
1258                         return 0;
1259                 }
1260         }
1261
1262         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1263                 return rc;
1264
1265         return -EINVAL;
1266 }
1267
1268 #ifdef CONFIG_NET_POLL_CONTROLLER
1269 static void ibmveth_poll_controller(struct net_device *dev)
1270 {
1271         ibmveth_replenish_task(netdev_priv(dev));
1272         ibmveth_interrupt(dev->irq, dev);
1273 }
1274 #endif
1275
1276 /**
1277  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1278  *
1279  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1280  *
1281  * Return value:
1282  *      Number of bytes of IO data the driver will need to perform well.
1283  */
1284 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1285 {
1286         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1287         struct ibmveth_adapter *adapter;
1288         struct iommu_table *tbl;
1289         unsigned long ret;
1290         int i;
1291         int rxqentries = 1;
1292
1293         tbl = get_iommu_table_base(&vdev->dev);
1294
1295         /* netdev inits at probe time along with the structures we need below*/
1296         if (netdev == NULL)
1297                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1298
1299         adapter = netdev_priv(netdev);
1300
1301         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1302         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1303
1304         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1305                 /* add the size of the active receive buffers */
1306                 if (adapter->rx_buff_pool[i].active)
1307                         ret +=
1308                             adapter->rx_buff_pool[i].size *
1309                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1310                                              buff_size, tbl);
1311                 rxqentries += adapter->rx_buff_pool[i].size;
1312         }
1313         /* add the size of the receive queue entries */
1314         ret += IOMMU_PAGE_ALIGN(
1315                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1316
1317         return ret;
1318 }
1319
1320 static const struct net_device_ops ibmveth_netdev_ops = {
1321         .ndo_open               = ibmveth_open,
1322         .ndo_stop               = ibmveth_close,
1323         .ndo_start_xmit         = ibmveth_start_xmit,
1324         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1325         .ndo_do_ioctl           = ibmveth_ioctl,
1326         .ndo_change_mtu         = ibmveth_change_mtu,
1327         .ndo_fix_features       = ibmveth_fix_features,
1328         .ndo_set_features       = ibmveth_set_features,
1329         .ndo_validate_addr      = eth_validate_addr,
1330         .ndo_set_mac_address    = eth_mac_addr,
1331 #ifdef CONFIG_NET_POLL_CONTROLLER
1332         .ndo_poll_controller    = ibmveth_poll_controller,
1333 #endif
1334 };
1335
1336 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1337 {
1338         int rc, i, mac_len;
1339         struct net_device *netdev;
1340         struct ibmveth_adapter *adapter;
1341         unsigned char *mac_addr_p;
1342         unsigned int *mcastFilterSize_p;
1343
1344         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1345                 dev->unit_address);
1346
1347         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1348                                                         &mac_len);
1349         if (!mac_addr_p) {
1350                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1351                 return -EINVAL;
1352         }
1353         /* Workaround for old/broken pHyp */
1354         if (mac_len == 8)
1355                 mac_addr_p += 2;
1356         else if (mac_len != 6) {
1357                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1358                         mac_len);
1359                 return -EINVAL;
1360         }
1361
1362         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1363                                                 VETH_MCAST_FILTER_SIZE, NULL);
1364         if (!mcastFilterSize_p) {
1365                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1366                         "attribute\n");
1367                 return -EINVAL;
1368         }
1369
1370         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1371
1372         if (!netdev)
1373                 return -ENOMEM;
1374
1375         adapter = netdev_priv(netdev);
1376         dev_set_drvdata(&dev->dev, netdev);
1377
1378         adapter->vdev = dev;
1379         adapter->netdev = netdev;
1380         adapter->mcastFilterSize = *mcastFilterSize_p;
1381         adapter->pool_config = 0;
1382
1383         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1384
1385         netdev->irq = dev->irq;
1386         netdev->netdev_ops = &ibmveth_netdev_ops;
1387         netdev->ethtool_ops = &netdev_ethtool_ops;
1388         SET_NETDEV_DEV(netdev, &dev->dev);
1389         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1390                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1391         netdev->features |= netdev->hw_features;
1392
1393         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1394
1395         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1396                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1397                 int error;
1398
1399                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1400                                          pool_count[i], pool_size[i],
1401                                          pool_active[i]);
1402                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1403                                              &dev->dev.kobj, "pool%d", i);
1404                 if (!error)
1405                         kobject_uevent(kobj, KOBJ_ADD);
1406         }
1407
1408         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1409
1410         adapter->buffer_list_dma = DMA_ERROR_CODE;
1411         adapter->filter_list_dma = DMA_ERROR_CODE;
1412         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1413
1414         netdev_dbg(netdev, "registering netdev...\n");
1415
1416         ibmveth_set_features(netdev, netdev->features);
1417
1418         rc = register_netdev(netdev);
1419
1420         if (rc) {
1421                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1422                 free_netdev(netdev);
1423                 return rc;
1424         }
1425
1426         netdev_dbg(netdev, "registered\n");
1427
1428         return 0;
1429 }
1430
1431 static int ibmveth_remove(struct vio_dev *dev)
1432 {
1433         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1434         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1435         int i;
1436
1437         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1438                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1439
1440         unregister_netdev(netdev);
1441
1442         free_netdev(netdev);
1443         dev_set_drvdata(&dev->dev, NULL);
1444
1445         return 0;
1446 }
1447
1448 static struct attribute veth_active_attr;
1449 static struct attribute veth_num_attr;
1450 static struct attribute veth_size_attr;
1451
1452 static ssize_t veth_pool_show(struct kobject *kobj,
1453                               struct attribute *attr, char *buf)
1454 {
1455         struct ibmveth_buff_pool *pool = container_of(kobj,
1456                                                       struct ibmveth_buff_pool,
1457                                                       kobj);
1458
1459         if (attr == &veth_active_attr)
1460                 return sprintf(buf, "%d\n", pool->active);
1461         else if (attr == &veth_num_attr)
1462                 return sprintf(buf, "%d\n", pool->size);
1463         else if (attr == &veth_size_attr)
1464                 return sprintf(buf, "%d\n", pool->buff_size);
1465         return 0;
1466 }
1467
1468 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1469                                const char *buf, size_t count)
1470 {
1471         struct ibmveth_buff_pool *pool = container_of(kobj,
1472                                                       struct ibmveth_buff_pool,
1473                                                       kobj);
1474         struct net_device *netdev = dev_get_drvdata(
1475             container_of(kobj->parent, struct device, kobj));
1476         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1477         long value = simple_strtol(buf, NULL, 10);
1478         long rc;
1479
1480         if (attr == &veth_active_attr) {
1481                 if (value && !pool->active) {
1482                         if (netif_running(netdev)) {
1483                                 if (ibmveth_alloc_buffer_pool(pool)) {
1484                                         netdev_err(netdev,
1485                                                    "unable to alloc pool\n");
1486                                         return -ENOMEM;
1487                                 }
1488                                 pool->active = 1;
1489                                 adapter->pool_config = 1;
1490                                 ibmveth_close(netdev);
1491                                 adapter->pool_config = 0;
1492                                 if ((rc = ibmveth_open(netdev)))
1493                                         return rc;
1494                         } else {
1495                                 pool->active = 1;
1496                         }
1497                 } else if (!value && pool->active) {
1498                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1499                         int i;
1500                         /* Make sure there is a buffer pool with buffers that
1501                            can hold a packet of the size of the MTU */
1502                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503                                 if (pool == &adapter->rx_buff_pool[i])
1504                                         continue;
1505                                 if (!adapter->rx_buff_pool[i].active)
1506                                         continue;
1507                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1508                                         break;
1509                         }
1510
1511                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1512                                 netdev_err(netdev, "no active pool >= MTU\n");
1513                                 return -EPERM;
1514                         }
1515
1516                         if (netif_running(netdev)) {
1517                                 adapter->pool_config = 1;
1518                                 ibmveth_close(netdev);
1519                                 pool->active = 0;
1520                                 adapter->pool_config = 0;
1521                                 if ((rc = ibmveth_open(netdev)))
1522                                         return rc;
1523                         }
1524                         pool->active = 0;
1525                 }
1526         } else if (attr == &veth_num_attr) {
1527                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1528                         return -EINVAL;
1529                 } else {
1530                         if (netif_running(netdev)) {
1531                                 adapter->pool_config = 1;
1532                                 ibmveth_close(netdev);
1533                                 adapter->pool_config = 0;
1534                                 pool->size = value;
1535                                 if ((rc = ibmveth_open(netdev)))
1536                                         return rc;
1537                         } else {
1538                                 pool->size = value;
1539                         }
1540                 }
1541         } else if (attr == &veth_size_attr) {
1542                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1543                         return -EINVAL;
1544                 } else {
1545                         if (netif_running(netdev)) {
1546                                 adapter->pool_config = 1;
1547                                 ibmveth_close(netdev);
1548                                 adapter->pool_config = 0;
1549                                 pool->buff_size = value;
1550                                 if ((rc = ibmveth_open(netdev)))
1551                                         return rc;
1552                         } else {
1553                                 pool->buff_size = value;
1554                         }
1555                 }
1556         }
1557
1558         /* kick the interrupt handler to allocate/deallocate pools */
1559         ibmveth_interrupt(netdev->irq, netdev);
1560         return count;
1561 }
1562
1563
1564 #define ATTR(_name, _mode)                              \
1565         struct attribute veth_##_name##_attr = {        \
1566         .name = __stringify(_name), .mode = _mode,      \
1567         };
1568
1569 static ATTR(active, 0644);
1570 static ATTR(num, 0644);
1571 static ATTR(size, 0644);
1572
1573 static struct attribute *veth_pool_attrs[] = {
1574         &veth_active_attr,
1575         &veth_num_attr,
1576         &veth_size_attr,
1577         NULL,
1578 };
1579
1580 static const struct sysfs_ops veth_pool_ops = {
1581         .show   = veth_pool_show,
1582         .store  = veth_pool_store,
1583 };
1584
1585 static struct kobj_type ktype_veth_pool = {
1586         .release        = NULL,
1587         .sysfs_ops      = &veth_pool_ops,
1588         .default_attrs  = veth_pool_attrs,
1589 };
1590
1591 static int ibmveth_resume(struct device *dev)
1592 {
1593         struct net_device *netdev = dev_get_drvdata(dev);
1594         ibmveth_interrupt(netdev->irq, netdev);
1595         return 0;
1596 }
1597
1598 static struct vio_device_id ibmveth_device_table[] = {
1599         { "network", "IBM,l-lan"},
1600         { "", "" }
1601 };
1602 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1603
1604 static struct dev_pm_ops ibmveth_pm_ops = {
1605         .resume = ibmveth_resume
1606 };
1607
1608 static struct vio_driver ibmveth_driver = {
1609         .id_table       = ibmveth_device_table,
1610         .probe          = ibmveth_probe,
1611         .remove         = ibmveth_remove,
1612         .get_desired_dma = ibmveth_get_desired_dma,
1613         .name           = ibmveth_driver_name,
1614         .pm             = &ibmveth_pm_ops,
1615 };
1616
1617 static int __init ibmveth_module_init(void)
1618 {
1619         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1620                ibmveth_driver_string, ibmveth_driver_version);
1621
1622         return vio_register_driver(&ibmveth_driver);
1623 }
1624
1625 static void __exit ibmveth_module_exit(void)
1626 {
1627         vio_unregister_driver(&ibmveth_driver);
1628 }
1629
1630 module_init(ibmveth_module_init);
1631 module_exit(ibmveth_module_exit);