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 <larson1@us.ibm.com>
  20  *          Santiago Leon <santil@linux.vnet.ibm.com>
  21  *          Brian King <brking@linux.vnet.ibm.com>
  22  *          Robert Jennings <rcj@linux.vnet.ibm.com>
  23  *          Anton Blanchard <anton@au.ibm.com>
  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 "1.05"
  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 static bool old_large_send __read_mostly;
  83 module_param(old_large_send, bool, S_IRUGO);
  84 MODULE_PARM_DESC(old_large_send,
  85         "Use old large send method on firmware that supports the new method");
  86
  87 struct ibmveth_stat {
  88         char name[ETH_GSTRING_LEN];
  89         int offset;
  90 };
  91
  92 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  93 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  94
  95 struct ibmveth_stat ibmveth_stats[] = {
  96         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  97         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
  98         { "replenish_add_buff_failure",
  99                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
 100         { "replenish_add_buff_success",
 101                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
 102         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
 103         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
 104         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 105         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 106         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
 107         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
 108         { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
 109         { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
 110         { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
 111 };
 112
 113 /* simple methods of getting data from the current rxq entry */
 114 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 115 {
 116         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
 117 }
 118
 119 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 120 {
 121         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 122                         IBMVETH_RXQ_TOGGLE_SHIFT;
 123 }
 124
 125 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 126 {
 127         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 128 }
 129
 130 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 131 {
 132         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 133 }
 134
 135 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 136 {
 137         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 138 }
 139
 140 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 141 {
 142         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 143 }
 144
 145 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 146 {
 147         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 148 }
 149
 150 /* setup the initial settings for a buffer pool */
 151 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 152                                      u32 pool_index, u32 pool_size,
 153                                      u32 buff_size, u32 pool_active)
 154 {
 155         pool->size = pool_size;
 156         pool->index = pool_index;
 157         pool->buff_size = buff_size;
 158         pool->threshold = pool_size * 7 / 8;
 159         pool->active = pool_active;
 160 }
 161
 162 /* allocate and setup an buffer pool - called during open */
 163 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 164 {
 165         int i;
 166
 167         pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 168
 169         if (!pool->free_map)
 170                 return -1;
 171
 172         pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
 173         if (!pool->dma_addr) {
 174                 kfree(pool->free_map);
 175                 pool->free_map = NULL;
 176                 return -1;
 177         }
 178
 179         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 180
 181         if (!pool->skbuff) {
 182                 kfree(pool->dma_addr);
 183                 pool->dma_addr = NULL;
 184
 185                 kfree(pool->free_map);
 186                 pool->free_map = NULL;
 187                 return -1;
 188         }
 189
 190         for (i = 0; i < pool->size; ++i)
 191                 pool->free_map[i] = i;
 192
 193         atomic_set(&pool->available, 0);
 194         pool->producer_index = 0;
 195         pool->consumer_index = 0;
 196
 197         return 0;
 198 }
 199
 200 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
 201 {
 202         unsigned long offset;
 203
 204         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
 205                 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
 206 }
 207
 208 /* replenish the buffers for a pool.  note that we don't need to
 209  * skb_reserve these since they are used for incoming...
 210  */
 211 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
 212                                           struct ibmveth_buff_pool *pool)
 213 {
 214         u32 i;
 215         u32 count = pool->size - atomic_read(&pool->available);
 216         u32 buffers_added = 0;
 217         struct sk_buff *skb;
 218         unsigned int free_index, index;
 219         u64 correlator;
 220         unsigned long lpar_rc;
 221         dma_addr_t dma_addr;
 222
 223         mb();
 224
 225         for (i = 0; i < count; ++i) {
 226                 union ibmveth_buf_desc desc;
 227
 228                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 229
 230                 if (!skb) {
 231                         netdev_dbg(adapter->netdev,
 232                                    "replenish: unable to allocate skb\n");
 233                         adapter->replenish_no_mem++;
 234                         break;
 235                 }
 236
 237                 free_index = pool->consumer_index;
 238                 pool->consumer_index++;
 239                 if (pool->consumer_index >= pool->size)
 240                         pool->consumer_index = 0;
 241                 index = pool->free_map[free_index];
 242
 243                 BUG_ON(index == IBM_VETH_INVALID_MAP);
 244                 BUG_ON(pool->skbuff[index] != NULL);
 245
 246                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 247                                 pool->buff_size, DMA_FROM_DEVICE);
 248
 249                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 250                         goto failure;
 251
 252                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 253                 pool->dma_addr[index] = dma_addr;
 254                 pool->skbuff[index] = skb;
 255
 256                 correlator = ((u64)pool->index << 32) | index;
 257                 *(u64 *)skb->data = correlator;
 258
 259                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 260                 desc.fields.address = dma_addr;
 261
 262                 if (rx_flush) {
 263                         unsigned int len = min(pool->buff_size,
 264                                                 adapter->netdev->mtu +
 265                                                 IBMVETH_BUFF_OH);
 266                         ibmveth_flush_buffer(skb->data, len);
 267                 }
 268                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
 269                                                    desc.desc);
 270
 271                 if (lpar_rc != H_SUCCESS) {
 272                         goto failure;
 273                 } else {
 274                         buffers_added++;
 275                         adapter->replenish_add_buff_success++;
 276                 }
 277         }
 278
 279         mb();
 280         atomic_add(buffers_added, &(pool->available));
 281         return;
 282
 283 failure:
 284         pool->free_map[free_index] = index;
 285         pool->skbuff[index] = NULL;
 286         if (pool->consumer_index == 0)
 287                 pool->consumer_index = pool->size - 1;
 288         else
 289                 pool->consumer_index--;
 290         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 291                 dma_unmap_single(&adapter->vdev->dev,
 292                                  pool->dma_addr[index], pool->buff_size,
 293                                  DMA_FROM_DEVICE);
 294         dev_kfree_skb_any(skb);
 295         adapter->replenish_add_buff_failure++;
 296
 297         mb();
 298         atomic_add(buffers_added, &(pool->available));
 299 }
 300
 301 /*
 302  * The final 8 bytes of the buffer list is a counter of frames dropped
 303  * because there was not a buffer in the buffer list capable of holding
 304  * the frame.
 305  */
 306 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
 307 {
 308         __be64 *p = adapter->buffer_list_addr + 4096 - 8;
 309
 310         adapter->rx_no_buffer = be64_to_cpup(p);
 311 }
 312
 313 /* replenish routine */
 314 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 315 {
 316         int i;
 317
 318         adapter->replenish_task_cycles++;
 319
 320         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 321                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 322
 323                 if (pool->active &&
 324                     (atomic_read(&pool->available) < pool->threshold))
 325                         ibmveth_replenish_buffer_pool(adapter, pool);
 326         }
 327
 328         ibmveth_update_rx_no_buffer(adapter);
 329 }
 330
 331 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 332 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 333                                      struct ibmveth_buff_pool *pool)
 334 {
 335         int i;
 336
 337         kfree(pool->free_map);
 338         pool->free_map = NULL;
 339
 340         if (pool->skbuff && pool->dma_addr) {
 341                 for (i = 0; i < pool->size; ++i) {
 342                         struct sk_buff *skb = pool->skbuff[i];
 343                         if (skb) {
 344                                 dma_unmap_single(&adapter->vdev->dev,
 345                                                  pool->dma_addr[i],
 346                                                  pool->buff_size,
 347                                                  DMA_FROM_DEVICE);
 348                                 dev_kfree_skb_any(skb);
 349                                 pool->skbuff[i] = NULL;
 350                         }
 351                 }
 352         }
 353
 354         if (pool->dma_addr) {
 355                 kfree(pool->dma_addr);
 356                 pool->dma_addr = NULL;
 357         }
 358
 359         if (pool->skbuff) {
 360                 kfree(pool->skbuff);
 361                 pool->skbuff = NULL;
 362         }
 363 }
 364
 365 /* remove a buffer from a pool */
 366 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 367                                             u64 correlator)
 368 {
 369         unsigned int pool  = correlator >> 32;
 370         unsigned int index = correlator & 0xffffffffUL;
 371         unsigned int free_index;
 372         struct sk_buff *skb;
 373
 374         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 375         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 376
 377         skb = adapter->rx_buff_pool[pool].skbuff[index];
 378
 379         BUG_ON(skb == NULL);
 380
 381         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 382
 383         dma_unmap_single(&adapter->vdev->dev,
 384                          adapter->rx_buff_pool[pool].dma_addr[index],
 385                          adapter->rx_buff_pool[pool].buff_size,
 386                          DMA_FROM_DEVICE);
 387
 388         free_index = adapter->rx_buff_pool[pool].producer_index;
 389         adapter->rx_buff_pool[pool].producer_index++;
 390         if (adapter->rx_buff_pool[pool].producer_index >=
 391             adapter->rx_buff_pool[pool].size)
 392                 adapter->rx_buff_pool[pool].producer_index = 0;
 393         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 394
 395         mb();
 396
 397         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 398 }
 399
 400 /* get the current buffer on the rx queue */
 401 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 402 {
 403         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 404         unsigned int pool = correlator >> 32;
 405         unsigned int index = correlator & 0xffffffffUL;
 406
 407         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 408         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 409
 410         return adapter->rx_buff_pool[pool].skbuff[index];
 411 }
 412
 413 /* recycle the current buffer on the rx queue */
 414 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 415 {
 416         u32 q_index = adapter->rx_queue.index;
 417         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 418         unsigned int pool = correlator >> 32;
 419         unsigned int index = correlator & 0xffffffffUL;
 420         union ibmveth_buf_desc desc;
 421         unsigned long lpar_rc;
 422         int ret = 1;
 423
 424         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 425         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 426
 427         if (!adapter->rx_buff_pool[pool].active) {
 428                 ibmveth_rxq_harvest_buffer(adapter);
 429                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 430                 goto out;
 431         }
 432
 433         desc.fields.flags_len = IBMVETH_BUF_VALID |
 434                 adapter->rx_buff_pool[pool].buff_size;
 435         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 436
 437         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 438
 439         if (lpar_rc != H_SUCCESS) {
 440                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 441                            "during recycle rc=%ld", lpar_rc);
 442                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 443                 ret = 0;
 444         }
 445
 446         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 447                 adapter->rx_queue.index = 0;
 448                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 449         }
 450
 451 out:
 452         return ret;
 453 }
 454
 455 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 456 {
 457         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 458
 459         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 460                 adapter->rx_queue.index = 0;
 461                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 462         }
 463 }
 464
 465 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 466 {
 467         int i;
 468         struct device *dev = &adapter->vdev->dev;
 469
 470         if (adapter->buffer_list_addr != NULL) {
 471                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
 472                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 473                                         DMA_BIDIRECTIONAL);
 474                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 475                 }
 476                 free_page((unsigned long)adapter->buffer_list_addr);
 477                 adapter->buffer_list_addr = NULL;
 478         }
 479
 480         if (adapter->filter_list_addr != NULL) {
 481                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
 482                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 483                                         DMA_BIDIRECTIONAL);
 484                         adapter->filter_list_dma = DMA_ERROR_CODE;
 485                 }
 486                 free_page((unsigned long)adapter->filter_list_addr);
 487                 adapter->filter_list_addr = NULL;
 488         }
 489
 490         if (adapter->rx_queue.queue_addr != NULL) {
 491                 dma_free_coherent(dev, adapter->rx_queue.queue_len,
 492                                   adapter->rx_queue.queue_addr,
 493                                   adapter->rx_queue.queue_dma);
 494                 adapter->rx_queue.queue_addr = NULL;
 495         }
 496
 497         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 498                 if (adapter->rx_buff_pool[i].active)
 499                         ibmveth_free_buffer_pool(adapter,
 500                                                  &adapter->rx_buff_pool[i]);
 501
 502         if (adapter->bounce_buffer != NULL) {
 503                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 504                         dma_unmap_single(&adapter->vdev->dev,
 505                                         adapter->bounce_buffer_dma,
 506                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
 507                                         DMA_BIDIRECTIONAL);
 508                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
 509                 }
 510                 kfree(adapter->bounce_buffer);
 511                 adapter->bounce_buffer = NULL;
 512         }
 513 }
 514
 515 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 516         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 517 {
 518         int rc, try_again = 1;
 519
 520         /*
 521          * After a kexec the adapter will still be open, so our attempt to
 522          * open it will fail. So if we get a failure we free the adapter and
 523          * try again, but only once.
 524          */
 525 retry:
 526         rc = h_register_logical_lan(adapter->vdev->unit_address,
 527                                     adapter->buffer_list_dma, rxq_desc.desc,
 528                                     adapter->filter_list_dma, mac_address);
 529
 530         if (rc != H_SUCCESS && try_again) {
 531                 do {
 532                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 533                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 534
 535                 try_again = 0;
 536                 goto retry;
 537         }
 538
 539         return rc;
 540 }
 541
 542 static u64 ibmveth_encode_mac_addr(u8 *mac)
 543 {
 544         int i;
 545         u64 encoded = 0;
 546
 547         for (i = 0; i < ETH_ALEN; i++)
 548                 encoded = (encoded << 8) | mac[i];
 549
 550         return encoded;
 551 }
 552
 553 static int ibmveth_open(struct net_device *netdev)
 554 {
 555         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 556         u64 mac_address;
 557         int rxq_entries = 1;
 558         unsigned long lpar_rc;
 559         int rc;
 560         union ibmveth_buf_desc rxq_desc;
 561         int i;
 562         struct device *dev;
 563
 564         netdev_dbg(netdev, "open starting\n");
 565
 566         napi_enable(&adapter->napi);
 567
 568         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 569                 rxq_entries += adapter->rx_buff_pool[i].size;
 570
 571         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 572         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 573
 574         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 575                 netdev_err(netdev, "unable to allocate filter or buffer list "
 576                            "pages\n");
 577                 rc = -ENOMEM;
 578                 goto err_out;
 579         }
 580
 581         dev = &adapter->vdev->dev;
 582
 583         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 584                                                 rxq_entries;
 585         adapter->rx_queue.queue_addr =
 586                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 587                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 588         if (!adapter->rx_queue.queue_addr) {
 589                 rc = -ENOMEM;
 590                 goto err_out;
 591         }
 592
 593         adapter->buffer_list_dma = dma_map_single(dev,
 594                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 595         adapter->filter_list_dma = dma_map_single(dev,
 596                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 597
 598         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
 599             (dma_mapping_error(dev, adapter->filter_list_dma))) {
 600                 netdev_err(netdev, "unable to map filter or buffer list "
 601                            "pages\n");
 602                 rc = -ENOMEM;
 603                 goto err_out;
 604         }
 605
 606         adapter->rx_queue.index = 0;
 607         adapter->rx_queue.num_slots = rxq_entries;
 608         adapter->rx_queue.toggle = 1;
 609
 610         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 611
 612         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 613                                         adapter->rx_queue.queue_len;
 614         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 615
 616         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 617         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 618         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 619
 620         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 621
 622         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 623
 624         if (lpar_rc != H_SUCCESS) {
 625                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 626                            lpar_rc);
 627                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 628                            "desc:0x%llx MAC:0x%llx\n",
 629                                      adapter->buffer_list_dma,
 630                                      adapter->filter_list_dma,
 631                                      rxq_desc.desc,
 632                                      mac_address);
 633                 rc = -ENONET;
 634                 goto err_out;
 635         }
 636
 637         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 638                 if (!adapter->rx_buff_pool[i].active)
 639                         continue;
 640                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 641                         netdev_err(netdev, "unable to alloc pool\n");
 642                         adapter->rx_buff_pool[i].active = 0;
 643                         rc = -ENOMEM;
 644                         goto err_out;
 645                 }
 646         }
 647
 648         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 649         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 650                          netdev);
 651         if (rc != 0) {
 652                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 653                            netdev->irq, rc);
 654                 do {
 655                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 656                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 657
 658                 goto err_out;
 659         }
 660
 661         adapter->bounce_buffer =
 662             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 663         if (!adapter->bounce_buffer) {
 664                 rc = -ENOMEM;
 665                 goto err_out_free_irq;
 666         }
 667         adapter->bounce_buffer_dma =
 668             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 669                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 670         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 671                 netdev_err(netdev, "unable to map bounce buffer\n");
 672                 rc = -ENOMEM;
 673                 goto err_out_free_irq;
 674         }
 675
 676         netdev_dbg(netdev, "initial replenish cycle\n");
 677         ibmveth_interrupt(netdev->irq, netdev);
 678
 679         netif_start_queue(netdev);
 680
 681         netdev_dbg(netdev, "open complete\n");
 682
 683         return 0;
 684
 685 err_out_free_irq:
 686         free_irq(netdev->irq, netdev);
 687 err_out:
 688         ibmveth_cleanup(adapter);
 689         napi_disable(&adapter->napi);
 690         return rc;
 691 }
 692
 693 static int ibmveth_close(struct net_device *netdev)
 694 {
 695         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 696         long lpar_rc;
 697
 698         netdev_dbg(netdev, "close starting\n");
 699
 700         napi_disable(&adapter->napi);
 701
 702         if (!adapter->pool_config)
 703                 netif_stop_queue(netdev);
 704
 705         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 706
 707         do {
 708                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 709         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 710
 711         if (lpar_rc != H_SUCCESS) {
 712                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 713                            "continuing with close\n", lpar_rc);
 714         }
 715
 716         free_irq(netdev->irq, netdev);
 717
 718         ibmveth_update_rx_no_buffer(adapter);
 719
 720         ibmveth_cleanup(adapter);
 721
 722         netdev_dbg(netdev, "close complete\n");
 723
 724         return 0;
 725 }
 726
 727 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 728 {
 729         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 730                                 SUPPORTED_FIBRE);
 731         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 732                                 ADVERTISED_FIBRE);
 733         ethtool_cmd_speed_set(cmd, SPEED_1000);
 734         cmd->duplex = DUPLEX_FULL;
 735         cmd->port = PORT_FIBRE;
 736         cmd->phy_address = 0;
 737         cmd->transceiver = XCVR_INTERNAL;
 738         cmd->autoneg = AUTONEG_ENABLE;
 739         cmd->maxtxpkt = 0;
 740         cmd->maxrxpkt = 1;
 741         return 0;
 742 }
 743
 744 static void netdev_get_drvinfo(struct net_device *dev,
 745                                struct ethtool_drvinfo *info)
 746 {
 747         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 748         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
 749 }
 750
 751 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 752         netdev_features_t features)
 753 {
 754         /*
 755          * Since the ibmveth firmware interface does not have the
 756          * concept of separate tx/rx checksum offload enable, if rx
 757          * checksum is disabled we also have to disable tx checksum
 758          * offload. Once we disable rx checksum offload, we are no
 759          * longer allowed to send tx buffers that are not properly
 760          * checksummed.
 761          */
 762
 763         if (!(features & NETIF_F_RXCSUM))
 764                 features &= ~NETIF_F_CSUM_MASK;
 765
 766         return features;
 767 }
 768
 769 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 770 {
 771         struct ibmveth_adapter *adapter = netdev_priv(dev);
 772         unsigned long set_attr, clr_attr, ret_attr;
 773         unsigned long set_attr6, clr_attr6;
 774         long ret, ret4, ret6;
 775         int rc1 = 0, rc2 = 0;
 776         int restart = 0;
 777
 778         if (netif_running(dev)) {
 779                 restart = 1;
 780                 adapter->pool_config = 1;
 781                 ibmveth_close(dev);
 782                 adapter->pool_config = 0;
 783         }
 784
 785         set_attr = 0;
 786         clr_attr = 0;
 787         set_attr6 = 0;
 788         clr_attr6 = 0;
 789
 790         if (data) {
 791                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 792                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 793         } else {
 794                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 795                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 796         }
 797
 798         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 799
 800         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
 801             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
 802             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 803                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 804                                          set_attr, &ret_attr);
 805
 806                 if (ret4 != H_SUCCESS) {
 807                         netdev_err(dev, "unable to change IPv4 checksum "
 808                                         "offload settings. %d rc=%ld\n",
 809                                         data, ret4);
 810
 811                         h_illan_attributes(adapter->vdev->unit_address,
 812                                            set_attr, clr_attr, &ret_attr);
 813
 814                         if (data == 1)
 815                                 dev->features &= ~NETIF_F_IP_CSUM;
 816
 817                 } else {
 818                         adapter->fw_ipv4_csum_support = data;
 819                 }
 820
 821                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 822                                          clr_attr6, set_attr6, &ret_attr);
 823
 824                 if (ret6 != H_SUCCESS) {
 825                         netdev_err(dev, "unable to change IPv6 checksum "
 826                                         "offload settings. %d rc=%ld\n",
 827                                         data, ret6);
 828
 829                         h_illan_attributes(adapter->vdev->unit_address,
 830                                            set_attr6, clr_attr6, &ret_attr);
 831
 832                         if (data == 1)
 833                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 834
 835                 } else
 836                         adapter->fw_ipv6_csum_support = data;
 837
 838                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 839                         adapter->rx_csum = data;
 840                 else
 841                         rc1 = -EIO;
 842         } else {
 843                 rc1 = -EIO;
 844                 netdev_err(dev, "unable to change checksum offload settings."
 845                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 846                                      ret_attr);
 847         }
 848
 849         if (restart)
 850                 rc2 = ibmveth_open(dev);
 851
 852         return rc1 ? rc1 : rc2;
 853 }
 854
 855 static int ibmveth_set_tso(struct net_device *dev, u32 data)
 856 {
 857         struct ibmveth_adapter *adapter = netdev_priv(dev);
 858         unsigned long set_attr, clr_attr, ret_attr;
 859         long ret1, ret2;
 860         int rc1 = 0, rc2 = 0;
 861         int restart = 0;
 862
 863         if (netif_running(dev)) {
 864                 restart = 1;
 865                 adapter->pool_config = 1;
 866                 ibmveth_close(dev);
 867                 adapter->pool_config = 0;
 868         }
 869
 870         set_attr = 0;
 871         clr_attr = 0;
 872
 873         if (data)
 874                 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 875         else
 876                 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 877
 878         ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 879
 880         if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
 881             !old_large_send) {
 882                 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 883                                           set_attr, &ret_attr);
 884
 885                 if (ret2 != H_SUCCESS) {
 886                         netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
 887                                    data, ret2);
 888
 889                         h_illan_attributes(adapter->vdev->unit_address,
 890                                            set_attr, clr_attr, &ret_attr);
 891
 892                         if (data == 1)
 893                                 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 894                         rc1 = -EIO;
 895
 896                 } else {
 897                         adapter->fw_large_send_support = data;
 898                         adapter->large_send = data;
 899                 }
 900         } else {
 901                 /* Older firmware version of large send offload does not
 902                  * support tcp6/ipv6
 903                  */
 904                 if (data == 1) {
 905                         dev->features &= ~NETIF_F_TSO6;
 906                         netdev_info(dev, "TSO feature requires all partitions to have updated driver");
 907                 }
 908                 adapter->large_send = data;
 909         }
 910
 911         if (restart)
 912                 rc2 = ibmveth_open(dev);
 913
 914         return rc1 ? rc1 : rc2;
 915 }
 916
 917 static int ibmveth_set_features(struct net_device *dev,
 918         netdev_features_t features)
 919 {
 920         struct ibmveth_adapter *adapter = netdev_priv(dev);
 921         int rx_csum = !!(features & NETIF_F_RXCSUM);
 922         int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
 923         int rc1 = 0, rc2 = 0;
 924
 925         if (rx_csum != adapter->rx_csum) {
 926                 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
 927                 if (rc1 && !adapter->rx_csum)
 928                         dev->features =
 929                                 features & ~(NETIF_F_CSUM_MASK |
 930                                              NETIF_F_RXCSUM);
 931         }
 932
 933         if (large_send != adapter->large_send) {
 934                 rc2 = ibmveth_set_tso(dev, large_send);
 935                 if (rc2 && !adapter->large_send)
 936                         dev->features =
 937                                 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
 938         }
 939
 940         return rc1 ? rc1 : rc2;
 941 }
 942
 943 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 944 {
 945         int i;
 946
 947         if (stringset != ETH_SS_STATS)
 948                 return;
 949
 950         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 951                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 952 }
 953
 954 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 955 {
 956         switch (sset) {
 957         case ETH_SS_STATS:
 958                 return ARRAY_SIZE(ibmveth_stats);
 959         default:
 960                 return -EOPNOTSUPP;
 961         }
 962 }
 963
 964 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 965                                       struct ethtool_stats *stats, u64 *data)
 966 {
 967         int i;
 968         struct ibmveth_adapter *adapter = netdev_priv(dev);
 969
 970         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 971                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 972 }
 973
 974 static const struct ethtool_ops netdev_ethtool_ops = {
 975         .get_drvinfo            = netdev_get_drvinfo,
 976         .get_settings           = netdev_get_settings,
 977         .get_link               = ethtool_op_get_link,
 978         .get_strings            = ibmveth_get_strings,
 979         .get_sset_count         = ibmveth_get_sset_count,
 980         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 981 };
 982
 983 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 984 {
 985         return -EOPNOTSUPP;
 986 }
 987
 988 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 989
 990 static int ibmveth_send(struct ibmveth_adapter *adapter,
 991                         union ibmveth_buf_desc *descs, unsigned long mss)
 992 {
 993         unsigned long correlator;
 994         unsigned int retry_count;
 995         unsigned long ret;
 996
 997         /*
 998          * The retry count sets a maximum for the number of broadcast and
 999          * multicast destinations within the system.
1000          */
1001         retry_count = 1024;
1002         correlator = 0;
1003         do {
1004                 ret = h_send_logical_lan(adapter->vdev->unit_address,
1005                                              descs[0].desc, descs[1].desc,
1006                                              descs[2].desc, descs[3].desc,
1007                                              descs[4].desc, descs[5].desc,
1008                                              correlator, &correlator, mss,
1009                                              adapter->fw_large_send_support);
1010         } while ((ret == H_BUSY) && (retry_count--));
1011
1012         if (ret != H_SUCCESS && ret != H_DROPPED) {
1013                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1014                            "with rc=%ld\n", ret);
1015                 return 1;
1016         }
1017
1018         return 0;
1019 }
1020
1021 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1022                                       struct net_device *netdev)
1023 {
1024         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1025         unsigned int desc_flags;
1026         union ibmveth_buf_desc descs[6];
1027         int last, i;
1028         int force_bounce = 0;
1029         dma_addr_t dma_addr;
1030         unsigned long mss = 0;
1031
1032         /*
1033          * veth handles a maximum of 6 segments including the header, so
1034          * we have to linearize the skb if there are more than this.
1035          */
1036         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1037                 netdev->stats.tx_dropped++;
1038                 goto out;
1039         }
1040
1041         /* veth can't checksum offload UDP */
1042         if (skb->ip_summed == CHECKSUM_PARTIAL &&
1043             ((skb->protocol == htons(ETH_P_IP) &&
1044               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1045              (skb->protocol == htons(ETH_P_IPV6) &&
1046               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1047             skb_checksum_help(skb)) {
1048
1049                 netdev_err(netdev, "tx: failed to checksum packet\n");
1050                 netdev->stats.tx_dropped++;
1051                 goto out;
1052         }
1053
1054         desc_flags = IBMVETH_BUF_VALID;
1055
1056         if (skb_is_gso(skb) && adapter->fw_large_send_support)
1057                 desc_flags |= IBMVETH_BUF_LRG_SND;
1058
1059         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1060                 unsigned char *buf = skb_transport_header(skb) +
1061                                                 skb->csum_offset;
1062
1063                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1064
1065                 /* Need to zero out the checksum */
1066                 buf[0] = 0;
1067                 buf[1] = 0;
1068         }
1069
1070 retry_bounce:
1071         memset(descs, 0, sizeof(descs));
1072
1073         /*
1074          * If a linear packet is below the rx threshold then
1075          * copy it into the static bounce buffer. This avoids the
1076          * cost of a TCE insert and remove.
1077          */
1078         if (force_bounce || (!skb_is_nonlinear(skb) &&
1079                                 (skb->len < tx_copybreak))) {
1080                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1081                                           skb->len);
1082
1083                 descs[0].fields.flags_len = desc_flags | skb->len;
1084                 descs[0].fields.address = adapter->bounce_buffer_dma;
1085
1086                 if (ibmveth_send(adapter, descs, 0)) {
1087                         adapter->tx_send_failed++;
1088                         netdev->stats.tx_dropped++;
1089                 } else {
1090                         netdev->stats.tx_packets++;
1091                         netdev->stats.tx_bytes += skb->len;
1092                 }
1093
1094                 goto out;
1095         }
1096
1097         /* Map the header */
1098         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1099                                   skb_headlen(skb), DMA_TO_DEVICE);
1100         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1101                 goto map_failed;
1102
1103         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1104         descs[0].fields.address = dma_addr;
1105
1106         /* Map the frags */
1107         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1108                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1109
1110                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1111                                             skb_frag_size(frag), DMA_TO_DEVICE);
1112
1113                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1114                         goto map_failed_frags;
1115
1116                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1117                 descs[i+1].fields.address = dma_addr;
1118         }
1119
1120         if (skb_is_gso(skb)) {
1121                 if (adapter->fw_large_send_support) {
1122                         mss = (unsigned long)skb_shinfo(skb)->gso_size;
1123                         adapter->tx_large_packets++;
1124                 } else if (!skb_is_gso_v6(skb)) {
1125                         /* Put -1 in the IP checksum to tell phyp it
1126                          * is a largesend packet. Put the mss in
1127                          * the TCP checksum.
1128                          */
1129                         ip_hdr(skb)->check = 0xffff;
1130                         tcp_hdr(skb)->check =
1131                                 cpu_to_be16(skb_shinfo(skb)->gso_size);
1132                         adapter->tx_large_packets++;
1133                 }
1134         }
1135
1136         if (ibmveth_send(adapter, descs, mss)) {
1137                 adapter->tx_send_failed++;
1138                 netdev->stats.tx_dropped++;
1139         } else {
1140                 netdev->stats.tx_packets++;
1141                 netdev->stats.tx_bytes += skb->len;
1142         }
1143
1144         dma_unmap_single(&adapter->vdev->dev,
1145                          descs[0].fields.address,
1146                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1147                          DMA_TO_DEVICE);
1148
1149         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1150                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1151                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1152                                DMA_TO_DEVICE);
1153
1154 out:
1155         dev_consume_skb_any(skb);
1156         return NETDEV_TX_OK;
1157
1158 map_failed_frags:
1159         last = i+1;
1160         for (i = 0; i < last; i++)
1161                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1162                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1163                                DMA_TO_DEVICE);
1164
1165 map_failed:
1166         if (!firmware_has_feature(FW_FEATURE_CMO))
1167                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1168         adapter->tx_map_failed++;
1169         if (skb_linearize(skb)) {
1170                 netdev->stats.tx_dropped++;
1171                 goto out;
1172         }
1173         force_bounce = 1;
1174         goto retry_bounce;
1175 }
1176
1177 static int ibmveth_poll(struct napi_struct *napi, int budget)
1178 {
1179         struct ibmveth_adapter *adapter =
1180                         container_of(napi, struct ibmveth_adapter, napi);
1181         struct net_device *netdev = adapter->netdev;
1182         int frames_processed = 0;
1183         unsigned long lpar_rc;
1184         struct iphdr *iph;
1185
1186 restart_poll:
1187         while (frames_processed < budget) {
1188                 if (!ibmveth_rxq_pending_buffer(adapter))
1189                         break;
1190
1191                 smp_rmb();
1192                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1193                         wmb(); /* suggested by larson1 */
1194                         adapter->rx_invalid_buffer++;
1195                         netdev_dbg(netdev, "recycling invalid buffer\n");
1196                         ibmveth_rxq_recycle_buffer(adapter);
1197                 } else {
1198                         struct sk_buff *skb, *new_skb;
1199                         int length = ibmveth_rxq_frame_length(adapter);
1200                         int offset = ibmveth_rxq_frame_offset(adapter);
1201                         int csum_good = ibmveth_rxq_csum_good(adapter);
1202
1203                         skb = ibmveth_rxq_get_buffer(adapter);
1204
1205                         new_skb = NULL;
1206                         if (length < rx_copybreak)
1207                                 new_skb = netdev_alloc_skb(netdev, length);
1208
1209                         if (new_skb) {
1210                                 skb_copy_to_linear_data(new_skb,
1211                                                         skb->data + offset,
1212                                                         length);
1213                                 if (rx_flush)
1214                                         ibmveth_flush_buffer(skb->data,
1215                                                 length + offset);
1216                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1217                                         kfree_skb(skb);
1218                                 skb = new_skb;
1219                         } else {
1220                                 ibmveth_rxq_harvest_buffer(adapter);
1221                                 skb_reserve(skb, offset);
1222                         }
1223
1224                         skb_put(skb, length);
1225                         skb->protocol = eth_type_trans(skb, netdev);
1226
1227                         if (csum_good) {
1228                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1229                                 if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
1230                                         iph = (struct iphdr *)skb->data;
1231
1232                                         /* If the IP checksum is not offloaded and if the packet
1233                                          *  is large send, the checksum must be rebuilt.
1234                                          */
1235                                         if (iph->check == 0xffff) {
1236                                                 iph->check = 0;
1237                                                 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
1238                                                 adapter->rx_large_packets++;
1239                                         }
1240                                 }
1241                         }
1242
1243                         napi_gro_receive(napi, skb);    /* send it up */
1244
1245                         netdev->stats.rx_packets++;
1246                         netdev->stats.rx_bytes += length;
1247                         frames_processed++;
1248                 }
1249         }
1250
1251         ibmveth_replenish_task(adapter);
1252
1253         if (frames_processed < budget) {
1254                 napi_complete(napi);
1255
1256                 /* We think we are done - reenable interrupts,
1257                  * then check once more to make sure we are done.
1258                  */
1259                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1260                                        VIO_IRQ_ENABLE);
1261
1262                 BUG_ON(lpar_rc != H_SUCCESS);
1263
1264                 if (ibmveth_rxq_pending_buffer(adapter) &&
1265                     napi_reschedule(napi)) {
1266                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1267                                                VIO_IRQ_DISABLE);
1268                         goto restart_poll;
1269                 }
1270         }
1271
1272         return frames_processed;
1273 }
1274
1275 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1276 {
1277         struct net_device *netdev = dev_instance;
1278         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1279         unsigned long lpar_rc;
1280
1281         if (napi_schedule_prep(&adapter->napi)) {
1282                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1283                                        VIO_IRQ_DISABLE);
1284                 BUG_ON(lpar_rc != H_SUCCESS);
1285                 __napi_schedule(&adapter->napi);
1286         }
1287         return IRQ_HANDLED;
1288 }
1289
1290 static void ibmveth_set_multicast_list(struct net_device *netdev)
1291 {
1292         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1293         unsigned long lpar_rc;
1294
1295         if ((netdev->flags & IFF_PROMISC) ||
1296             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1297                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1298                                            IbmVethMcastEnableRecv |
1299                                            IbmVethMcastDisableFiltering,
1300                                            0);
1301                 if (lpar_rc != H_SUCCESS) {
1302                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1303                                    "entering promisc mode\n", lpar_rc);
1304                 }
1305         } else {
1306                 struct netdev_hw_addr *ha;
1307                 /* clear the filter table & disable filtering */
1308                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1309                                            IbmVethMcastEnableRecv |
1310                                            IbmVethMcastDisableFiltering |
1311                                            IbmVethMcastClearFilterTable,
1312                                            0);
1313                 if (lpar_rc != H_SUCCESS) {
1314                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1315                                    "attempting to clear filter table\n",
1316                                    lpar_rc);
1317                 }
1318                 /* add the addresses to the filter table */
1319                 netdev_for_each_mc_addr(ha, netdev) {
1320                         /* add the multicast address to the filter table */
1321                         u64 mcast_addr;
1322                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1323                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1324                                                    IbmVethMcastAddFilter,
1325                                                    mcast_addr);
1326                         if (lpar_rc != H_SUCCESS) {
1327                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1328                                            "when adding an entry to the filter "
1329                                            "table\n", lpar_rc);
1330                         }
1331                 }
1332
1333                 /* re-enable filtering */
1334                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1335                                            IbmVethMcastEnableFiltering,
1336                                            0);
1337                 if (lpar_rc != H_SUCCESS) {
1338                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1339                                    "enabling filtering\n", lpar_rc);
1340                 }
1341         }
1342 }
1343
1344 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1345 {
1346         struct ibmveth_adapter *adapter = netdev_priv(dev);
1347         struct vio_dev *viodev = adapter->vdev;
1348         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1349         int i, rc;
1350         int need_restart = 0;
1351
1352         if (new_mtu < IBMVETH_MIN_MTU)
1353                 return -EINVAL;
1354
1355         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1356                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1357                         break;
1358
1359         if (i == IBMVETH_NUM_BUFF_POOLS)
1360                 return -EINVAL;
1361
1362         /* Deactivate all the buffer pools so that the next loop can activate
1363            only the buffer pools necessary to hold the new MTU */
1364         if (netif_running(adapter->netdev)) {
1365                 need_restart = 1;
1366                 adapter->pool_config = 1;
1367                 ibmveth_close(adapter->netdev);
1368                 adapter->pool_config = 0;
1369         }
1370
1371         /* Look for an active buffer pool that can hold the new MTU */
1372         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1373                 adapter->rx_buff_pool[i].active = 1;
1374
1375                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1376                         dev->mtu = new_mtu;
1377                         vio_cmo_set_dev_desired(viodev,
1378                                                 ibmveth_get_desired_dma
1379                                                 (viodev));
1380                         if (need_restart) {
1381                                 return ibmveth_open(adapter->netdev);
1382                         }
1383                         return 0;
1384                 }
1385         }
1386
1387         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1388                 return rc;
1389
1390         return -EINVAL;
1391 }
1392
1393 #ifdef CONFIG_NET_POLL_CONTROLLER
1394 static void ibmveth_poll_controller(struct net_device *dev)
1395 {
1396         ibmveth_replenish_task(netdev_priv(dev));
1397         ibmveth_interrupt(dev->irq, dev);
1398 }
1399 #endif
1400
1401 /**
1402  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1403  *
1404  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1405  *
1406  * Return value:
1407  *      Number of bytes of IO data the driver will need to perform well.
1408  */
1409 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1410 {
1411         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1412         struct ibmveth_adapter *adapter;
1413         struct iommu_table *tbl;
1414         unsigned long ret;
1415         int i;
1416         int rxqentries = 1;
1417
1418         tbl = get_iommu_table_base(&vdev->dev);
1419
1420         /* netdev inits at probe time along with the structures we need below*/
1421         if (netdev == NULL)
1422                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1423
1424         adapter = netdev_priv(netdev);
1425
1426         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1427         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1428
1429         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1430                 /* add the size of the active receive buffers */
1431                 if (adapter->rx_buff_pool[i].active)
1432                         ret +=
1433                             adapter->rx_buff_pool[i].size *
1434                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1435                                              buff_size, tbl);
1436                 rxqentries += adapter->rx_buff_pool[i].size;
1437         }
1438         /* add the size of the receive queue entries */
1439         ret += IOMMU_PAGE_ALIGN(
1440                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1441
1442         return ret;
1443 }
1444
1445 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1446 {
1447         struct ibmveth_adapter *adapter = netdev_priv(dev);
1448         struct sockaddr *addr = p;
1449         u64 mac_address;
1450         int rc;
1451
1452         if (!is_valid_ether_addr(addr->sa_data))
1453                 return -EADDRNOTAVAIL;
1454
1455         mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1456         rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1457         if (rc) {
1458                 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1459                 return rc;
1460         }
1461
1462         ether_addr_copy(dev->dev_addr, addr->sa_data);
1463
1464         return 0;
1465 }
1466
1467 static const struct net_device_ops ibmveth_netdev_ops = {
1468         .ndo_open               = ibmveth_open,
1469         .ndo_stop               = ibmveth_close,
1470         .ndo_start_xmit         = ibmveth_start_xmit,
1471         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1472         .ndo_do_ioctl           = ibmveth_ioctl,
1473         .ndo_change_mtu         = ibmveth_change_mtu,
1474         .ndo_fix_features       = ibmveth_fix_features,
1475         .ndo_set_features       = ibmveth_set_features,
1476         .ndo_validate_addr      = eth_validate_addr,
1477         .ndo_set_mac_address    = ibmveth_set_mac_addr,
1478 #ifdef CONFIG_NET_POLL_CONTROLLER
1479         .ndo_poll_controller    = ibmveth_poll_controller,
1480 #endif
1481 };
1482
1483 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1484 {
1485         int rc, i, mac_len;
1486         struct net_device *netdev;
1487         struct ibmveth_adapter *adapter;
1488         unsigned char *mac_addr_p;
1489         unsigned int *mcastFilterSize_p;
1490         long ret;
1491         unsigned long ret_attr;
1492
1493         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1494                 dev->unit_address);
1495
1496         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1497                                                         &mac_len);
1498         if (!mac_addr_p) {
1499                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1500                 return -EINVAL;
1501         }
1502         /* Workaround for old/broken pHyp */
1503         if (mac_len == 8)
1504                 mac_addr_p += 2;
1505         else if (mac_len != 6) {
1506                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1507                         mac_len);
1508                 return -EINVAL;
1509         }
1510
1511         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1512                                                 VETH_MCAST_FILTER_SIZE, NULL);
1513         if (!mcastFilterSize_p) {
1514                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1515                         "attribute\n");
1516                 return -EINVAL;
1517         }
1518
1519         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1520
1521         if (!netdev)
1522                 return -ENOMEM;
1523
1524         adapter = netdev_priv(netdev);
1525         dev_set_drvdata(&dev->dev, netdev);
1526
1527         adapter->vdev = dev;
1528         adapter->netdev = netdev;
1529         adapter->mcastFilterSize = *mcastFilterSize_p;
1530         adapter->pool_config = 0;
1531
1532         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1533
1534         netdev->irq = dev->irq;
1535         netdev->netdev_ops = &ibmveth_netdev_ops;
1536         netdev->ethtool_ops = &netdev_ethtool_ops;
1537         SET_NETDEV_DEV(netdev, &dev->dev);
1538         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1539                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1540
1541         netdev->features |= netdev->hw_features;
1542
1543         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1544
1545         /* If running older firmware, TSO should not be enabled by default */
1546         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1547             !old_large_send) {
1548                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1549                 netdev->features |= netdev->hw_features;
1550         } else {
1551                 netdev->hw_features |= NETIF_F_TSO;
1552         }
1553
1554         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1555
1556         if (firmware_has_feature(FW_FEATURE_CMO))
1557                 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1558
1559         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1560                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1561                 int error;
1562
1563                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1564                                          pool_count[i], pool_size[i],
1565                                          pool_active[i]);
1566                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1567                                              &dev->dev.kobj, "pool%d", i);
1568                 if (!error)
1569                         kobject_uevent(kobj, KOBJ_ADD);
1570         }
1571
1572         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1573
1574         adapter->buffer_list_dma = DMA_ERROR_CODE;
1575         adapter->filter_list_dma = DMA_ERROR_CODE;
1576         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1577
1578         netdev_dbg(netdev, "registering netdev...\n");
1579
1580         ibmveth_set_features(netdev, netdev->features);
1581
1582         rc = register_netdev(netdev);
1583
1584         if (rc) {
1585                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1586                 free_netdev(netdev);
1587                 return rc;
1588         }
1589
1590         netdev_dbg(netdev, "registered\n");
1591
1592         return 0;
1593 }
1594
1595 static int ibmveth_remove(struct vio_dev *dev)
1596 {
1597         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1598         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1599         int i;
1600
1601         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1602                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1603
1604         unregister_netdev(netdev);
1605
1606         free_netdev(netdev);
1607         dev_set_drvdata(&dev->dev, NULL);
1608
1609         return 0;
1610 }
1611
1612 static struct attribute veth_active_attr;
1613 static struct attribute veth_num_attr;
1614 static struct attribute veth_size_attr;
1615
1616 static ssize_t veth_pool_show(struct kobject *kobj,
1617                               struct attribute *attr, char *buf)
1618 {
1619         struct ibmveth_buff_pool *pool = container_of(kobj,
1620                                                       struct ibmveth_buff_pool,
1621                                                       kobj);
1622
1623         if (attr == &veth_active_attr)
1624                 return sprintf(buf, "%d\n", pool->active);
1625         else if (attr == &veth_num_attr)
1626                 return sprintf(buf, "%d\n", pool->size);
1627         else if (attr == &veth_size_attr)
1628                 return sprintf(buf, "%d\n", pool->buff_size);
1629         return 0;
1630 }
1631
1632 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1633                                const char *buf, size_t count)
1634 {
1635         struct ibmveth_buff_pool *pool = container_of(kobj,
1636                                                       struct ibmveth_buff_pool,
1637                                                       kobj);
1638         struct net_device *netdev = dev_get_drvdata(
1639             container_of(kobj->parent, struct device, kobj));
1640         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1641         long value = simple_strtol(buf, NULL, 10);
1642         long rc;
1643
1644         if (attr == &veth_active_attr) {
1645                 if (value && !pool->active) {
1646                         if (netif_running(netdev)) {
1647                                 if (ibmveth_alloc_buffer_pool(pool)) {
1648                                         netdev_err(netdev,
1649                                                    "unable to alloc pool\n");
1650                                         return -ENOMEM;
1651                                 }
1652                                 pool->active = 1;
1653                                 adapter->pool_config = 1;
1654                                 ibmveth_close(netdev);
1655                                 adapter->pool_config = 0;
1656                                 if ((rc = ibmveth_open(netdev)))
1657                                         return rc;
1658                         } else {
1659                                 pool->active = 1;
1660                         }
1661                 } else if (!value && pool->active) {
1662                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1663                         int i;
1664                         /* Make sure there is a buffer pool with buffers that
1665                            can hold a packet of the size of the MTU */
1666                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1667                                 if (pool == &adapter->rx_buff_pool[i])
1668                                         continue;
1669                                 if (!adapter->rx_buff_pool[i].active)
1670                                         continue;
1671                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1672                                         break;
1673                         }
1674
1675                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1676                                 netdev_err(netdev, "no active pool >= MTU\n");
1677                                 return -EPERM;
1678                         }
1679
1680                         if (netif_running(netdev)) {
1681                                 adapter->pool_config = 1;
1682                                 ibmveth_close(netdev);
1683                                 pool->active = 0;
1684                                 adapter->pool_config = 0;
1685                                 if ((rc = ibmveth_open(netdev)))
1686                                         return rc;
1687                         }
1688                         pool->active = 0;
1689                 }
1690         } else if (attr == &veth_num_attr) {
1691                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1692                         return -EINVAL;
1693                 } else {
1694                         if (netif_running(netdev)) {
1695                                 adapter->pool_config = 1;
1696                                 ibmveth_close(netdev);
1697                                 adapter->pool_config = 0;
1698                                 pool->size = value;
1699                                 if ((rc = ibmveth_open(netdev)))
1700                                         return rc;
1701                         } else {
1702                                 pool->size = value;
1703                         }
1704                 }
1705         } else if (attr == &veth_size_attr) {
1706                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1707                         return -EINVAL;
1708                 } else {
1709                         if (netif_running(netdev)) {
1710                                 adapter->pool_config = 1;
1711                                 ibmveth_close(netdev);
1712                                 adapter->pool_config = 0;
1713                                 pool->buff_size = value;
1714                                 if ((rc = ibmveth_open(netdev)))
1715                                         return rc;
1716                         } else {
1717                                 pool->buff_size = value;
1718                         }
1719                 }
1720         }
1721
1722         /* kick the interrupt handler to allocate/deallocate pools */
1723         ibmveth_interrupt(netdev->irq, netdev);
1724         return count;
1725 }
1726
1727
1728 #define ATTR(_name, _mode)                              \
1729         struct attribute veth_##_name##_attr = {        \
1730         .name = __stringify(_name), .mode = _mode,      \
1731         };
1732
1733 static ATTR(active, 0644);
1734 static ATTR(num, 0644);
1735 static ATTR(size, 0644);
1736
1737 static struct attribute *veth_pool_attrs[] = {
1738         &veth_active_attr,
1739         &veth_num_attr,
1740         &veth_size_attr,
1741         NULL,
1742 };
1743
1744 static const struct sysfs_ops veth_pool_ops = {
1745         .show   = veth_pool_show,
1746         .store  = veth_pool_store,
1747 };
1748
1749 static struct kobj_type ktype_veth_pool = {
1750         .release        = NULL,
1751         .sysfs_ops      = &veth_pool_ops,
1752         .default_attrs  = veth_pool_attrs,
1753 };
1754
1755 static int ibmveth_resume(struct device *dev)
1756 {
1757         struct net_device *netdev = dev_get_drvdata(dev);
1758         ibmveth_interrupt(netdev->irq, netdev);
1759         return 0;
1760 }
1761
1762 static struct vio_device_id ibmveth_device_table[] = {
1763         { "network", "IBM,l-lan"},
1764         { "", "" }
1765 };
1766 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1767
1768 static struct dev_pm_ops ibmveth_pm_ops = {
1769         .resume = ibmveth_resume
1770 };
1771
1772 static struct vio_driver ibmveth_driver = {
1773         .id_table       = ibmveth_device_table,
1774         .probe          = ibmveth_probe,
1775         .remove         = ibmveth_remove,
1776         .get_desired_dma = ibmveth_get_desired_dma,
1777         .name           = ibmveth_driver_name,
1778         .pm             = &ibmveth_pm_ops,
1779 };
1780
1781 static int __init ibmveth_module_init(void)
1782 {
1783         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1784                ibmveth_driver_string, ibmveth_driver_version);
1785
1786         return vio_register_driver(&ibmveth_driver);
1787 }
1788
1789 static void __exit ibmveth_module_exit(void)
1790 {
1791         vio_unregister_driver(&ibmveth_driver);
1792 }
1793
1794 module_init(ibmveth_module_init);
1795 module_exit(ibmveth_module_exit);