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 "1.04"
  62
  63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  65 MODULE_LICENSE("GPL");
  66 MODULE_VERSION(ibmveth_driver_version);
  67
  68 static unsigned int tx_copybreak __read_mostly = 128;
  69 module_param(tx_copybreak, uint, 0644);
  70 MODULE_PARM_DESC(tx_copybreak,
  71         "Maximum size of packet that is copied to a new buffer on transmit");
  72
  73 static unsigned int rx_copybreak __read_mostly = 128;
  74 module_param(rx_copybreak, uint, 0644);
  75 MODULE_PARM_DESC(rx_copybreak,
  76         "Maximum size of packet that is copied to a new buffer on receive");
  77
  78 static unsigned int rx_flush __read_mostly = 0;
  79 module_param(rx_flush, uint, 0644);
  80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  81
  82 struct ibmveth_stat {
  83         char name[ETH_GSTRING_LEN];
  84         int offset;
  85 };
  86
  87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  89
  90 struct ibmveth_stat ibmveth_stats[] = {
  91         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  92         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
  93         { "replenish_add_buff_failure",
  94                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
  95         { "replenish_add_buff_success",
  96                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
  97         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
  98         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
  99         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 100         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 101         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
 102         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
 103 };
 104
 105 /* simple methods of getting data from the current rxq entry */
 106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 107 {
 108         return 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 /*
 296  * The final 8 bytes of the buffer list is a counter of frames dropped
 297  * because there was not a buffer in the buffer list capable of holding
 298  * the frame.
 299  */
 300 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
 301 {
 302         __be64 *p = adapter->buffer_list_addr + 4096 - 8;
 303
 304         adapter->rx_no_buffer = be64_to_cpup(p);
 305 }
 306
 307 /* replenish routine */
 308 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 309 {
 310         int i;
 311
 312         adapter->replenish_task_cycles++;
 313
 314         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 315                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 316
 317                 if (pool->active &&
 318                     (atomic_read(&pool->available) < pool->threshold))
 319                         ibmveth_replenish_buffer_pool(adapter, pool);
 320         }
 321
 322         ibmveth_update_rx_no_buffer(adapter);
 323 }
 324
 325 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 326 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 327                                      struct ibmveth_buff_pool *pool)
 328 {
 329         int i;
 330
 331         kfree(pool->free_map);
 332         pool->free_map = NULL;
 333
 334         if (pool->skbuff && pool->dma_addr) {
 335                 for (i = 0; i < pool->size; ++i) {
 336                         struct sk_buff *skb = pool->skbuff[i];
 337                         if (skb) {
 338                                 dma_unmap_single(&adapter->vdev->dev,
 339                                                  pool->dma_addr[i],
 340                                                  pool->buff_size,
 341                                                  DMA_FROM_DEVICE);
 342                                 dev_kfree_skb_any(skb);
 343                                 pool->skbuff[i] = NULL;
 344                         }
 345                 }
 346         }
 347
 348         if (pool->dma_addr) {
 349                 kfree(pool->dma_addr);
 350                 pool->dma_addr = NULL;
 351         }
 352
 353         if (pool->skbuff) {
 354                 kfree(pool->skbuff);
 355                 pool->skbuff = NULL;
 356         }
 357 }
 358
 359 /* remove a buffer from a pool */
 360 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 361                                             u64 correlator)
 362 {
 363         unsigned int pool  = correlator >> 32;
 364         unsigned int index = correlator & 0xffffffffUL;
 365         unsigned int free_index;
 366         struct sk_buff *skb;
 367
 368         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 369         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 370
 371         skb = adapter->rx_buff_pool[pool].skbuff[index];
 372
 373         BUG_ON(skb == NULL);
 374
 375         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 376
 377         dma_unmap_single(&adapter->vdev->dev,
 378                          adapter->rx_buff_pool[pool].dma_addr[index],
 379                          adapter->rx_buff_pool[pool].buff_size,
 380                          DMA_FROM_DEVICE);
 381
 382         free_index = adapter->rx_buff_pool[pool].producer_index;
 383         adapter->rx_buff_pool[pool].producer_index++;
 384         if (adapter->rx_buff_pool[pool].producer_index >=
 385             adapter->rx_buff_pool[pool].size)
 386                 adapter->rx_buff_pool[pool].producer_index = 0;
 387         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 388
 389         mb();
 390
 391         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 392 }
 393
 394 /* get the current buffer on the rx queue */
 395 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 396 {
 397         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 398         unsigned int pool = correlator >> 32;
 399         unsigned int index = correlator & 0xffffffffUL;
 400
 401         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 402         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 403
 404         return adapter->rx_buff_pool[pool].skbuff[index];
 405 }
 406
 407 /* recycle the current buffer on the rx queue */
 408 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 409 {
 410         u32 q_index = adapter->rx_queue.index;
 411         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 412         unsigned int pool = correlator >> 32;
 413         unsigned int index = correlator & 0xffffffffUL;
 414         union ibmveth_buf_desc desc;
 415         unsigned long lpar_rc;
 416         int ret = 1;
 417
 418         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 419         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 420
 421         if (!adapter->rx_buff_pool[pool].active) {
 422                 ibmveth_rxq_harvest_buffer(adapter);
 423                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 424                 goto out;
 425         }
 426
 427         desc.fields.flags_len = IBMVETH_BUF_VALID |
 428                 adapter->rx_buff_pool[pool].buff_size;
 429         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 430
 431         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 432
 433         if (lpar_rc != H_SUCCESS) {
 434                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 435                            "during recycle rc=%ld", lpar_rc);
 436                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 437                 ret = 0;
 438         }
 439
 440         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 441                 adapter->rx_queue.index = 0;
 442                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 443         }
 444
 445 out:
 446         return ret;
 447 }
 448
 449 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 450 {
 451         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 452
 453         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 454                 adapter->rx_queue.index = 0;
 455                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 456         }
 457 }
 458
 459 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 460 {
 461         int i;
 462         struct device *dev = &adapter->vdev->dev;
 463
 464         if (adapter->buffer_list_addr != NULL) {
 465                 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
 466                         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 467                                         DMA_BIDIRECTIONAL);
 468                         adapter->buffer_list_dma = DMA_ERROR_CODE;
 469                 }
 470                 free_page((unsigned long)adapter->buffer_list_addr);
 471                 adapter->buffer_list_addr = NULL;
 472         }
 473
 474         if (adapter->filter_list_addr != NULL) {
 475                 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
 476                         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 477                                         DMA_BIDIRECTIONAL);
 478                         adapter->filter_list_dma = DMA_ERROR_CODE;
 479                 }
 480                 free_page((unsigned long)adapter->filter_list_addr);
 481                 adapter->filter_list_addr = NULL;
 482         }
 483
 484         if (adapter->rx_queue.queue_addr != NULL) {
 485                 dma_free_coherent(dev, adapter->rx_queue.queue_len,
 486                                   adapter->rx_queue.queue_addr,
 487                                   adapter->rx_queue.queue_dma);
 488                 adapter->rx_queue.queue_addr = NULL;
 489         }
 490
 491         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 492                 if (adapter->rx_buff_pool[i].active)
 493                         ibmveth_free_buffer_pool(adapter,
 494                                                  &adapter->rx_buff_pool[i]);
 495
 496         if (adapter->bounce_buffer != NULL) {
 497                 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 498                         dma_unmap_single(&adapter->vdev->dev,
 499                                         adapter->bounce_buffer_dma,
 500                                         adapter->netdev->mtu + IBMVETH_BUFF_OH,
 501                                         DMA_BIDIRECTIONAL);
 502                         adapter->bounce_buffer_dma = DMA_ERROR_CODE;
 503                 }
 504                 kfree(adapter->bounce_buffer);
 505                 adapter->bounce_buffer = NULL;
 506         }
 507 }
 508
 509 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 510         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 511 {
 512         int rc, try_again = 1;
 513
 514         /*
 515          * After a kexec the adapter will still be open, so our attempt to
 516          * open it will fail. So if we get a failure we free the adapter and
 517          * try again, but only once.
 518          */
 519 retry:
 520         rc = h_register_logical_lan(adapter->vdev->unit_address,
 521                                     adapter->buffer_list_dma, rxq_desc.desc,
 522                                     adapter->filter_list_dma, mac_address);
 523
 524         if (rc != H_SUCCESS && try_again) {
 525                 do {
 526                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 527                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 528
 529                 try_again = 0;
 530                 goto retry;
 531         }
 532
 533         return rc;
 534 }
 535
 536 static u64 ibmveth_encode_mac_addr(u8 *mac)
 537 {
 538         int i;
 539         u64 encoded = 0;
 540
 541         for (i = 0; i < ETH_ALEN; i++)
 542                 encoded = (encoded << 8) | mac[i];
 543
 544         return encoded;
 545 }
 546
 547 static int ibmveth_open(struct net_device *netdev)
 548 {
 549         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 550         u64 mac_address;
 551         int rxq_entries = 1;
 552         unsigned long lpar_rc;
 553         int rc;
 554         union ibmveth_buf_desc rxq_desc;
 555         int i;
 556         struct device *dev;
 557
 558         netdev_dbg(netdev, "open starting\n");
 559
 560         napi_enable(&adapter->napi);
 561
 562         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 563                 rxq_entries += adapter->rx_buff_pool[i].size;
 564
 565         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 566         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 567
 568         if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 569                 netdev_err(netdev, "unable to allocate filter or buffer list "
 570                            "pages\n");
 571                 rc = -ENOMEM;
 572                 goto err_out;
 573         }
 574
 575         dev = &adapter->vdev->dev;
 576
 577         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 578                                                 rxq_entries;
 579         adapter->rx_queue.queue_addr =
 580                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 581                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 582         if (!adapter->rx_queue.queue_addr) {
 583                 rc = -ENOMEM;
 584                 goto err_out;
 585         }
 586
 587         adapter->buffer_list_dma = dma_map_single(dev,
 588                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 589         adapter->filter_list_dma = dma_map_single(dev,
 590                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 591
 592         if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
 593             (dma_mapping_error(dev, adapter->filter_list_dma))) {
 594                 netdev_err(netdev, "unable to map filter or buffer list "
 595                            "pages\n");
 596                 rc = -ENOMEM;
 597                 goto err_out;
 598         }
 599
 600         adapter->rx_queue.index = 0;
 601         adapter->rx_queue.num_slots = rxq_entries;
 602         adapter->rx_queue.toggle = 1;
 603
 604         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 605
 606         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 607                                         adapter->rx_queue.queue_len;
 608         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 609
 610         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 611         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 612         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 613
 614         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 615
 616         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 617
 618         if (lpar_rc != H_SUCCESS) {
 619                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 620                            lpar_rc);
 621                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 622                            "desc:0x%llx MAC:0x%llx\n",
 623                                      adapter->buffer_list_dma,
 624                                      adapter->filter_list_dma,
 625                                      rxq_desc.desc,
 626                                      mac_address);
 627                 rc = -ENONET;
 628                 goto err_out;
 629         }
 630
 631         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 632                 if (!adapter->rx_buff_pool[i].active)
 633                         continue;
 634                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 635                         netdev_err(netdev, "unable to alloc pool\n");
 636                         adapter->rx_buff_pool[i].active = 0;
 637                         rc = -ENOMEM;
 638                         goto err_out;
 639                 }
 640         }
 641
 642         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 643         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 644                          netdev);
 645         if (rc != 0) {
 646                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 647                            netdev->irq, rc);
 648                 do {
 649                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 650                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 651
 652                 goto err_out;
 653         }
 654
 655         adapter->bounce_buffer =
 656             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 657         if (!adapter->bounce_buffer) {
 658                 rc = -ENOMEM;
 659                 goto err_out_free_irq;
 660         }
 661         adapter->bounce_buffer_dma =
 662             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 663                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 664         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 665                 netdev_err(netdev, "unable to map bounce buffer\n");
 666                 rc = -ENOMEM;
 667                 goto err_out_free_irq;
 668         }
 669
 670         netdev_dbg(netdev, "initial replenish cycle\n");
 671         ibmveth_interrupt(netdev->irq, netdev);
 672
 673         netif_start_queue(netdev);
 674
 675         netdev_dbg(netdev, "open complete\n");
 676
 677         return 0;
 678
 679 err_out_free_irq:
 680         free_irq(netdev->irq, netdev);
 681 err_out:
 682         ibmveth_cleanup(adapter);
 683         napi_disable(&adapter->napi);
 684         return rc;
 685 }
 686
 687 static int ibmveth_close(struct net_device *netdev)
 688 {
 689         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 690         long lpar_rc;
 691
 692         netdev_dbg(netdev, "close starting\n");
 693
 694         napi_disable(&adapter->napi);
 695
 696         if (!adapter->pool_config)
 697                 netif_stop_queue(netdev);
 698
 699         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 700
 701         do {
 702                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 703         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 704
 705         if (lpar_rc != H_SUCCESS) {
 706                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 707                            "continuing with close\n", lpar_rc);
 708         }
 709
 710         free_irq(netdev->irq, netdev);
 711
 712         ibmveth_update_rx_no_buffer(adapter);
 713
 714         ibmveth_cleanup(adapter);
 715
 716         netdev_dbg(netdev, "close complete\n");
 717
 718         return 0;
 719 }
 720
 721 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 722 {
 723         cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 724                                 SUPPORTED_FIBRE);
 725         cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 726                                 ADVERTISED_FIBRE);
 727         ethtool_cmd_speed_set(cmd, SPEED_1000);
 728         cmd->duplex = DUPLEX_FULL;
 729         cmd->port = PORT_FIBRE;
 730         cmd->phy_address = 0;
 731         cmd->transceiver = XCVR_INTERNAL;
 732         cmd->autoneg = AUTONEG_ENABLE;
 733         cmd->maxtxpkt = 0;
 734         cmd->maxrxpkt = 1;
 735         return 0;
 736 }
 737
 738 static void netdev_get_drvinfo(struct net_device *dev,
 739                                struct ethtool_drvinfo *info)
 740 {
 741         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 742         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
 743 }
 744
 745 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 746         netdev_features_t features)
 747 {
 748         /*
 749          * Since the ibmveth firmware interface does not have the
 750          * concept of separate tx/rx checksum offload enable, if rx
 751          * checksum is disabled we also have to disable tx checksum
 752          * offload. Once we disable rx checksum offload, we are no
 753          * longer allowed to send tx buffers that are not properly
 754          * checksummed.
 755          */
 756
 757         if (!(features & NETIF_F_RXCSUM))
 758                 features &= ~NETIF_F_ALL_CSUM;
 759
 760         return features;
 761 }
 762
 763 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 764 {
 765         struct ibmveth_adapter *adapter = netdev_priv(dev);
 766         unsigned long set_attr, clr_attr, ret_attr;
 767         unsigned long set_attr6, clr_attr6;
 768         long ret, ret4, ret6;
 769         int rc1 = 0, rc2 = 0;
 770         int restart = 0;
 771
 772         if (netif_running(dev)) {
 773                 restart = 1;
 774                 adapter->pool_config = 1;
 775                 ibmveth_close(dev);
 776                 adapter->pool_config = 0;
 777         }
 778
 779         set_attr = 0;
 780         clr_attr = 0;
 781         set_attr6 = 0;
 782         clr_attr6 = 0;
 783
 784         if (data) {
 785                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 786                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 787         } else {
 788                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 789                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 790         }
 791
 792         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 793
 794         if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
 795             !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
 796             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 797                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 798                                          set_attr, &ret_attr);
 799
 800                 if (ret4 != H_SUCCESS) {
 801                         netdev_err(dev, "unable to change IPv4 checksum "
 802                                         "offload settings. %d rc=%ld\n",
 803                                         data, ret4);
 804
 805                         h_illan_attributes(adapter->vdev->unit_address,
 806                                            set_attr, clr_attr, &ret_attr);
 807
 808                         if (data == 1)
 809                                 dev->features &= ~NETIF_F_IP_CSUM;
 810
 811                 } else {
 812                         adapter->fw_ipv4_csum_support = data;
 813                 }
 814
 815                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 816                                          clr_attr6, set_attr6, &ret_attr);
 817
 818                 if (ret6 != H_SUCCESS) {
 819                         netdev_err(dev, "unable to change IPv6 checksum "
 820                                         "offload settings. %d rc=%ld\n",
 821                                         data, ret6);
 822
 823                         h_illan_attributes(adapter->vdev->unit_address,
 824                                            set_attr6, clr_attr6, &ret_attr);
 825
 826                         if (data == 1)
 827                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 828
 829                 } else
 830                         adapter->fw_ipv6_csum_support = data;
 831
 832                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 833                         adapter->rx_csum = data;
 834                 else
 835                         rc1 = -EIO;
 836         } else {
 837                 rc1 = -EIO;
 838                 netdev_err(dev, "unable to change checksum offload settings."
 839                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 840                                      ret_attr);
 841         }
 842
 843         if (restart)
 844                 rc2 = ibmveth_open(dev);
 845
 846         return rc1 ? rc1 : rc2;
 847 }
 848
 849 static int ibmveth_set_features(struct net_device *dev,
 850         netdev_features_t features)
 851 {
 852         struct ibmveth_adapter *adapter = netdev_priv(dev);
 853         int rx_csum = !!(features & NETIF_F_RXCSUM);
 854         int rc;
 855
 856         if (rx_csum == adapter->rx_csum)
 857                 return 0;
 858
 859         rc = ibmveth_set_csum_offload(dev, rx_csum);
 860         if (rc && !adapter->rx_csum)
 861                 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
 862
 863         return rc;
 864 }
 865
 866 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 867 {
 868         int i;
 869
 870         if (stringset != ETH_SS_STATS)
 871                 return;
 872
 873         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 874                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 875 }
 876
 877 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 878 {
 879         switch (sset) {
 880         case ETH_SS_STATS:
 881                 return ARRAY_SIZE(ibmveth_stats);
 882         default:
 883                 return -EOPNOTSUPP;
 884         }
 885 }
 886
 887 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 888                                       struct ethtool_stats *stats, u64 *data)
 889 {
 890         int i;
 891         struct ibmveth_adapter *adapter = netdev_priv(dev);
 892
 893         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 894                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 895 }
 896
 897 static const struct ethtool_ops netdev_ethtool_ops = {
 898         .get_drvinfo            = netdev_get_drvinfo,
 899         .get_settings           = netdev_get_settings,
 900         .get_link               = ethtool_op_get_link,
 901         .get_strings            = ibmveth_get_strings,
 902         .get_sset_count         = ibmveth_get_sset_count,
 903         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 904 };
 905
 906 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 907 {
 908         return -EOPNOTSUPP;
 909 }
 910
 911 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 912
 913 static int ibmveth_send(struct ibmveth_adapter *adapter,
 914                         union ibmveth_buf_desc *descs)
 915 {
 916         unsigned long correlator;
 917         unsigned int retry_count;
 918         unsigned long ret;
 919
 920         /*
 921          * The retry count sets a maximum for the number of broadcast and
 922          * multicast destinations within the system.
 923          */
 924         retry_count = 1024;
 925         correlator = 0;
 926         do {
 927                 ret = h_send_logical_lan(adapter->vdev->unit_address,
 928                                              descs[0].desc, descs[1].desc,
 929                                              descs[2].desc, descs[3].desc,
 930                                              descs[4].desc, descs[5].desc,
 931                                              correlator, &correlator);
 932         } while ((ret == H_BUSY) && (retry_count--));
 933
 934         if (ret != H_SUCCESS && ret != H_DROPPED) {
 935                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
 936                            "with rc=%ld\n", ret);
 937                 return 1;
 938         }
 939
 940         return 0;
 941 }
 942
 943 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
 944                                       struct net_device *netdev)
 945 {
 946         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 947         unsigned int desc_flags;
 948         union ibmveth_buf_desc descs[6];
 949         int last, i;
 950         int force_bounce = 0;
 951         dma_addr_t dma_addr;
 952
 953         /*
 954          * veth handles a maximum of 6 segments including the header, so
 955          * we have to linearize the skb if there are more than this.
 956          */
 957         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
 958                 netdev->stats.tx_dropped++;
 959                 goto out;
 960         }
 961
 962         /* veth can't checksum offload UDP */
 963         if (skb->ip_summed == CHECKSUM_PARTIAL &&
 964             ((skb->protocol == htons(ETH_P_IP) &&
 965               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
 966              (skb->protocol == htons(ETH_P_IPV6) &&
 967               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
 968             skb_checksum_help(skb)) {
 969
 970                 netdev_err(netdev, "tx: failed to checksum packet\n");
 971                 netdev->stats.tx_dropped++;
 972                 goto out;
 973         }
 974
 975         desc_flags = IBMVETH_BUF_VALID;
 976
 977         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 978                 unsigned char *buf = skb_transport_header(skb) +
 979                                                 skb->csum_offset;
 980
 981                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
 982
 983                 /* Need to zero out the checksum */
 984                 buf[0] = 0;
 985                 buf[1] = 0;
 986         }
 987
 988 retry_bounce:
 989         memset(descs, 0, sizeof(descs));
 990
 991         /*
 992          * If a linear packet is below the rx threshold then
 993          * copy it into the static bounce buffer. This avoids the
 994          * cost of a TCE insert and remove.
 995          */
 996         if (force_bounce || (!skb_is_nonlinear(skb) &&
 997                                 (skb->len < tx_copybreak))) {
 998                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
 999                                           skb->len);
1000
1001                 descs[0].fields.flags_len = desc_flags | skb->len;
1002                 descs[0].fields.address = adapter->bounce_buffer_dma;
1003
1004                 if (ibmveth_send(adapter, descs)) {
1005                         adapter->tx_send_failed++;
1006                         netdev->stats.tx_dropped++;
1007                 } else {
1008                         netdev->stats.tx_packets++;
1009                         netdev->stats.tx_bytes += skb->len;
1010                 }
1011
1012                 goto out;
1013         }
1014
1015         /* Map the header */
1016         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1017                                   skb_headlen(skb), DMA_TO_DEVICE);
1018         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1019                 goto map_failed;
1020
1021         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1022         descs[0].fields.address = dma_addr;
1023
1024         /* Map the frags */
1025         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1026                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1027
1028                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1029                                             skb_frag_size(frag), DMA_TO_DEVICE);
1030
1031                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1032                         goto map_failed_frags;
1033
1034                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1035                 descs[i+1].fields.address = dma_addr;
1036         }
1037
1038         if (ibmveth_send(adapter, descs)) {
1039                 adapter->tx_send_failed++;
1040                 netdev->stats.tx_dropped++;
1041         } else {
1042                 netdev->stats.tx_packets++;
1043                 netdev->stats.tx_bytes += skb->len;
1044         }
1045
1046         dma_unmap_single(&adapter->vdev->dev,
1047                          descs[0].fields.address,
1048                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1049                          DMA_TO_DEVICE);
1050
1051         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1052                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1053                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1054                                DMA_TO_DEVICE);
1055
1056 out:
1057         dev_consume_skb_any(skb);
1058         return NETDEV_TX_OK;
1059
1060 map_failed_frags:
1061         last = i+1;
1062         for (i = 0; i < last; i++)
1063                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1064                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1065                                DMA_TO_DEVICE);
1066
1067 map_failed:
1068         if (!firmware_has_feature(FW_FEATURE_CMO))
1069                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1070         adapter->tx_map_failed++;
1071         skb_linearize(skb);
1072         force_bounce = 1;
1073         goto retry_bounce;
1074 }
1075
1076 static int ibmveth_poll(struct napi_struct *napi, int budget)
1077 {
1078         struct ibmveth_adapter *adapter =
1079                         container_of(napi, struct ibmveth_adapter, napi);
1080         struct net_device *netdev = adapter->netdev;
1081         int frames_processed = 0;
1082         unsigned long lpar_rc;
1083
1084 restart_poll:
1085         while (frames_processed < budget) {
1086                 if (!ibmveth_rxq_pending_buffer(adapter))
1087                         break;
1088
1089                 smp_rmb();
1090                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1091                         wmb(); /* suggested by larson1 */
1092                         adapter->rx_invalid_buffer++;
1093                         netdev_dbg(netdev, "recycling invalid buffer\n");
1094                         ibmveth_rxq_recycle_buffer(adapter);
1095                 } else {
1096                         struct sk_buff *skb, *new_skb;
1097                         int length = ibmveth_rxq_frame_length(adapter);
1098                         int offset = ibmveth_rxq_frame_offset(adapter);
1099                         int csum_good = ibmveth_rxq_csum_good(adapter);
1100
1101                         skb = ibmveth_rxq_get_buffer(adapter);
1102
1103                         new_skb = NULL;
1104                         if (length < rx_copybreak)
1105                                 new_skb = netdev_alloc_skb(netdev, length);
1106
1107                         if (new_skb) {
1108                                 skb_copy_to_linear_data(new_skb,
1109                                                         skb->data + offset,
1110                                                         length);
1111                                 if (rx_flush)
1112                                         ibmveth_flush_buffer(skb->data,
1113                                                 length + offset);
1114                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1115                                         kfree_skb(skb);
1116                                 skb = new_skb;
1117                         } else {
1118                                 ibmveth_rxq_harvest_buffer(adapter);
1119                                 skb_reserve(skb, offset);
1120                         }
1121
1122                         skb_put(skb, length);
1123                         skb->protocol = eth_type_trans(skb, netdev);
1124
1125                         if (csum_good)
1126                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1127
1128                         netif_receive_skb(skb); /* send it up */
1129
1130                         netdev->stats.rx_packets++;
1131                         netdev->stats.rx_bytes += length;
1132                         frames_processed++;
1133                 }
1134         }
1135
1136         ibmveth_replenish_task(adapter);
1137
1138         if (frames_processed < budget) {
1139                 /* We think we are done - reenable interrupts,
1140                  * then check once more to make sure we are done.
1141                  */
1142                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1143                                        VIO_IRQ_ENABLE);
1144
1145                 BUG_ON(lpar_rc != H_SUCCESS);
1146
1147                 napi_complete(napi);
1148
1149                 if (ibmveth_rxq_pending_buffer(adapter) &&
1150                     napi_reschedule(napi)) {
1151                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1152                                                VIO_IRQ_DISABLE);
1153                         goto restart_poll;
1154                 }
1155         }
1156
1157         return frames_processed;
1158 }
1159
1160 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1161 {
1162         struct net_device *netdev = dev_instance;
1163         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1164         unsigned long lpar_rc;
1165
1166         if (napi_schedule_prep(&adapter->napi)) {
1167                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1168                                        VIO_IRQ_DISABLE);
1169                 BUG_ON(lpar_rc != H_SUCCESS);
1170                 __napi_schedule(&adapter->napi);
1171         }
1172         return IRQ_HANDLED;
1173 }
1174
1175 static void ibmveth_set_multicast_list(struct net_device *netdev)
1176 {
1177         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1178         unsigned long lpar_rc;
1179
1180         if ((netdev->flags & IFF_PROMISC) ||
1181             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1182                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1183                                            IbmVethMcastEnableRecv |
1184                                            IbmVethMcastDisableFiltering,
1185                                            0);
1186                 if (lpar_rc != H_SUCCESS) {
1187                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1188                                    "entering promisc mode\n", lpar_rc);
1189                 }
1190         } else {
1191                 struct netdev_hw_addr *ha;
1192                 /* clear the filter table & disable filtering */
1193                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1194                                            IbmVethMcastEnableRecv |
1195                                            IbmVethMcastDisableFiltering |
1196                                            IbmVethMcastClearFilterTable,
1197                                            0);
1198                 if (lpar_rc != H_SUCCESS) {
1199                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1200                                    "attempting to clear filter table\n",
1201                                    lpar_rc);
1202                 }
1203                 /* add the addresses to the filter table */
1204                 netdev_for_each_mc_addr(ha, netdev) {
1205                         /* add the multicast address to the filter table */
1206                         u64 mcast_addr;
1207                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1208                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1209                                                    IbmVethMcastAddFilter,
1210                                                    mcast_addr);
1211                         if (lpar_rc != H_SUCCESS) {
1212                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1213                                            "when adding an entry to the filter "
1214                                            "table\n", lpar_rc);
1215                         }
1216                 }
1217
1218                 /* re-enable filtering */
1219                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1220                                            IbmVethMcastEnableFiltering,
1221                                            0);
1222                 if (lpar_rc != H_SUCCESS) {
1223                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1224                                    "enabling filtering\n", lpar_rc);
1225                 }
1226         }
1227 }
1228
1229 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1230 {
1231         struct ibmveth_adapter *adapter = netdev_priv(dev);
1232         struct vio_dev *viodev = adapter->vdev;
1233         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1234         int i, rc;
1235         int need_restart = 0;
1236
1237         if (new_mtu < IBMVETH_MIN_MTU)
1238                 return -EINVAL;
1239
1240         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1241                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1242                         break;
1243
1244         if (i == IBMVETH_NUM_BUFF_POOLS)
1245                 return -EINVAL;
1246
1247         /* Deactivate all the buffer pools so that the next loop can activate
1248            only the buffer pools necessary to hold the new MTU */
1249         if (netif_running(adapter->netdev)) {
1250                 need_restart = 1;
1251                 adapter->pool_config = 1;
1252                 ibmveth_close(adapter->netdev);
1253                 adapter->pool_config = 0;
1254         }
1255
1256         /* Look for an active buffer pool that can hold the new MTU */
1257         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1258                 adapter->rx_buff_pool[i].active = 1;
1259
1260                 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1261                         dev->mtu = new_mtu;
1262                         vio_cmo_set_dev_desired(viodev,
1263                                                 ibmveth_get_desired_dma
1264                                                 (viodev));
1265                         if (need_restart) {
1266                                 return ibmveth_open(adapter->netdev);
1267                         }
1268                         return 0;
1269                 }
1270         }
1271
1272         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1273                 return rc;
1274
1275         return -EINVAL;
1276 }
1277
1278 #ifdef CONFIG_NET_POLL_CONTROLLER
1279 static void ibmveth_poll_controller(struct net_device *dev)
1280 {
1281         ibmveth_replenish_task(netdev_priv(dev));
1282         ibmveth_interrupt(dev->irq, dev);
1283 }
1284 #endif
1285
1286 /**
1287  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1288  *
1289  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1290  *
1291  * Return value:
1292  *      Number of bytes of IO data the driver will need to perform well.
1293  */
1294 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1295 {
1296         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1297         struct ibmveth_adapter *adapter;
1298         struct iommu_table *tbl;
1299         unsigned long ret;
1300         int i;
1301         int rxqentries = 1;
1302
1303         tbl = get_iommu_table_base(&vdev->dev);
1304
1305         /* netdev inits at probe time along with the structures we need below*/
1306         if (netdev == NULL)
1307                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1308
1309         adapter = netdev_priv(netdev);
1310
1311         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1312         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1313
1314         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1315                 /* add the size of the active receive buffers */
1316                 if (adapter->rx_buff_pool[i].active)
1317                         ret +=
1318                             adapter->rx_buff_pool[i].size *
1319                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1320                                              buff_size, tbl);
1321                 rxqentries += adapter->rx_buff_pool[i].size;
1322         }
1323         /* add the size of the receive queue entries */
1324         ret += IOMMU_PAGE_ALIGN(
1325                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1326
1327         return ret;
1328 }
1329
1330 static const struct net_device_ops ibmveth_netdev_ops = {
1331         .ndo_open               = ibmveth_open,
1332         .ndo_stop               = ibmveth_close,
1333         .ndo_start_xmit         = ibmveth_start_xmit,
1334         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1335         .ndo_do_ioctl           = ibmveth_ioctl,
1336         .ndo_change_mtu         = ibmveth_change_mtu,
1337         .ndo_fix_features       = ibmveth_fix_features,
1338         .ndo_set_features       = ibmveth_set_features,
1339         .ndo_validate_addr      = eth_validate_addr,
1340         .ndo_set_mac_address    = eth_mac_addr,
1341 #ifdef CONFIG_NET_POLL_CONTROLLER
1342         .ndo_poll_controller    = ibmveth_poll_controller,
1343 #endif
1344 };
1345
1346 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1347 {
1348         int rc, i, mac_len;
1349         struct net_device *netdev;
1350         struct ibmveth_adapter *adapter;
1351         unsigned char *mac_addr_p;
1352         unsigned int *mcastFilterSize_p;
1353
1354         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1355                 dev->unit_address);
1356
1357         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1358                                                         &mac_len);
1359         if (!mac_addr_p) {
1360                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1361                 return -EINVAL;
1362         }
1363         /* Workaround for old/broken pHyp */
1364         if (mac_len == 8)
1365                 mac_addr_p += 2;
1366         else if (mac_len != 6) {
1367                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1368                         mac_len);
1369                 return -EINVAL;
1370         }
1371
1372         mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1373                                                 VETH_MCAST_FILTER_SIZE, NULL);
1374         if (!mcastFilterSize_p) {
1375                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1376                         "attribute\n");
1377                 return -EINVAL;
1378         }
1379
1380         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1381
1382         if (!netdev)
1383                 return -ENOMEM;
1384
1385         adapter = netdev_priv(netdev);
1386         dev_set_drvdata(&dev->dev, netdev);
1387
1388         adapter->vdev = dev;
1389         adapter->netdev = netdev;
1390         adapter->mcastFilterSize = *mcastFilterSize_p;
1391         adapter->pool_config = 0;
1392
1393         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1394
1395         netdev->irq = dev->irq;
1396         netdev->netdev_ops = &ibmveth_netdev_ops;
1397         netdev->ethtool_ops = &netdev_ethtool_ops;
1398         SET_NETDEV_DEV(netdev, &dev->dev);
1399         netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1400                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1401         netdev->features |= netdev->hw_features;
1402
1403         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1404
1405         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1406                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1407                 int error;
1408
1409                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1410                                          pool_count[i], pool_size[i],
1411                                          pool_active[i]);
1412                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1413                                              &dev->dev.kobj, "pool%d", i);
1414                 if (!error)
1415                         kobject_uevent(kobj, KOBJ_ADD);
1416         }
1417
1418         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1419
1420         adapter->buffer_list_dma = DMA_ERROR_CODE;
1421         adapter->filter_list_dma = DMA_ERROR_CODE;
1422         adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1423
1424         netdev_dbg(netdev, "registering netdev...\n");
1425
1426         ibmveth_set_features(netdev, netdev->features);
1427
1428         rc = register_netdev(netdev);
1429
1430         if (rc) {
1431                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1432                 free_netdev(netdev);
1433                 return rc;
1434         }
1435
1436         netdev_dbg(netdev, "registered\n");
1437
1438         return 0;
1439 }
1440
1441 static int ibmveth_remove(struct vio_dev *dev)
1442 {
1443         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1444         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1445         int i;
1446
1447         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1448                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1449
1450         unregister_netdev(netdev);
1451
1452         free_netdev(netdev);
1453         dev_set_drvdata(&dev->dev, NULL);
1454
1455         return 0;
1456 }
1457
1458 static struct attribute veth_active_attr;
1459 static struct attribute veth_num_attr;
1460 static struct attribute veth_size_attr;
1461
1462 static ssize_t veth_pool_show(struct kobject *kobj,
1463                               struct attribute *attr, char *buf)
1464 {
1465         struct ibmveth_buff_pool *pool = container_of(kobj,
1466                                                       struct ibmveth_buff_pool,
1467                                                       kobj);
1468
1469         if (attr == &veth_active_attr)
1470                 return sprintf(buf, "%d\n", pool->active);
1471         else if (attr == &veth_num_attr)
1472                 return sprintf(buf, "%d\n", pool->size);
1473         else if (attr == &veth_size_attr)
1474                 return sprintf(buf, "%d\n", pool->buff_size);
1475         return 0;
1476 }
1477
1478 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1479                                const char *buf, size_t count)
1480 {
1481         struct ibmveth_buff_pool *pool = container_of(kobj,
1482                                                       struct ibmveth_buff_pool,
1483                                                       kobj);
1484         struct net_device *netdev = dev_get_drvdata(
1485             container_of(kobj->parent, struct device, kobj));
1486         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1487         long value = simple_strtol(buf, NULL, 10);
1488         long rc;
1489
1490         if (attr == &veth_active_attr) {
1491                 if (value && !pool->active) {
1492                         if (netif_running(netdev)) {
1493                                 if (ibmveth_alloc_buffer_pool(pool)) {
1494                                         netdev_err(netdev,
1495                                                    "unable to alloc pool\n");
1496                                         return -ENOMEM;
1497                                 }
1498                                 pool->active = 1;
1499                                 adapter->pool_config = 1;
1500                                 ibmveth_close(netdev);
1501                                 adapter->pool_config = 0;
1502                                 if ((rc = ibmveth_open(netdev)))
1503                                         return rc;
1504                         } else {
1505                                 pool->active = 1;
1506                         }
1507                 } else if (!value && pool->active) {
1508                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1509                         int i;
1510                         /* Make sure there is a buffer pool with buffers that
1511                            can hold a packet of the size of the MTU */
1512                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1513                                 if (pool == &adapter->rx_buff_pool[i])
1514                                         continue;
1515                                 if (!adapter->rx_buff_pool[i].active)
1516                                         continue;
1517                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1518                                         break;
1519                         }
1520
1521                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1522                                 netdev_err(netdev, "no active pool >= MTU\n");
1523                                 return -EPERM;
1524                         }
1525
1526                         if (netif_running(netdev)) {
1527                                 adapter->pool_config = 1;
1528                                 ibmveth_close(netdev);
1529                                 pool->active = 0;
1530                                 adapter->pool_config = 0;
1531                                 if ((rc = ibmveth_open(netdev)))
1532                                         return rc;
1533                         }
1534                         pool->active = 0;
1535                 }
1536         } else if (attr == &veth_num_attr) {
1537                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1538                         return -EINVAL;
1539                 } else {
1540                         if (netif_running(netdev)) {
1541                                 adapter->pool_config = 1;
1542                                 ibmveth_close(netdev);
1543                                 adapter->pool_config = 0;
1544                                 pool->size = value;
1545                                 if ((rc = ibmveth_open(netdev)))
1546                                         return rc;
1547                         } else {
1548                                 pool->size = value;
1549                         }
1550                 }
1551         } else if (attr == &veth_size_attr) {
1552                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1553                         return -EINVAL;
1554                 } else {
1555                         if (netif_running(netdev)) {
1556                                 adapter->pool_config = 1;
1557                                 ibmveth_close(netdev);
1558                                 adapter->pool_config = 0;
1559                                 pool->buff_size = value;
1560                                 if ((rc = ibmveth_open(netdev)))
1561                                         return rc;
1562                         } else {
1563                                 pool->buff_size = value;
1564                         }
1565                 }
1566         }
1567
1568         /* kick the interrupt handler to allocate/deallocate pools */
1569         ibmveth_interrupt(netdev->irq, netdev);
1570         return count;
1571 }
1572
1573
1574 #define ATTR(_name, _mode)                              \
1575         struct attribute veth_##_name##_attr = {        \
1576         .name = __stringify(_name), .mode = _mode,      \
1577         };
1578
1579 static ATTR(active, 0644);
1580 static ATTR(num, 0644);
1581 static ATTR(size, 0644);
1582
1583 static struct attribute *veth_pool_attrs[] = {
1584         &veth_active_attr,
1585         &veth_num_attr,
1586         &veth_size_attr,
1587         NULL,
1588 };
1589
1590 static const struct sysfs_ops veth_pool_ops = {
1591         .show   = veth_pool_show,
1592         .store  = veth_pool_store,
1593 };
1594
1595 static struct kobj_type ktype_veth_pool = {
1596         .release        = NULL,
1597         .sysfs_ops      = &veth_pool_ops,
1598         .default_attrs  = veth_pool_attrs,
1599 };
1600
1601 static int ibmveth_resume(struct device *dev)
1602 {
1603         struct net_device *netdev = dev_get_drvdata(dev);
1604         ibmveth_interrupt(netdev->irq, netdev);
1605         return 0;
1606 }
1607
1608 static struct vio_device_id ibmveth_device_table[] = {
1609         { "network", "IBM,l-lan"},
1610         { "", "" }
1611 };
1612 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1613
1614 static struct dev_pm_ops ibmveth_pm_ops = {
1615         .resume = ibmveth_resume
1616 };
1617
1618 static struct vio_driver ibmveth_driver = {
1619         .id_table       = ibmveth_device_table,
1620         .probe          = ibmveth_probe,
1621         .remove         = ibmveth_remove,
1622         .get_desired_dma = ibmveth_get_desired_dma,
1623         .name           = ibmveth_driver_name,
1624         .pm             = &ibmveth_pm_ops,
1625 };
1626
1627 static int __init ibmveth_module_init(void)
1628 {
1629         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1630                ibmveth_driver_string, ibmveth_driver_version);
1631
1632         return vio_register_driver(&ibmveth_driver);
1633 }
1634
1635 static void __exit ibmveth_module_exit(void)
1636 {
1637         vio_unregister_driver(&ibmveth_driver);
1638 }
1639
1640 module_init(ibmveth_module_init);
1641 module_exit(ibmveth_module_exit);