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 #include <net/tcp.h>
  50 #include <net/ip6_checksum.h>
  51
  52 #include "ibmveth.h"
  53
  54 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  55 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  56 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  57
  58 static struct kobj_type ktype_veth_pool;
  59
  60
  61 static const char ibmveth_driver_name[] = "ibmveth";
  62 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  63 #define ibmveth_driver_version "1.06"
  64
  65 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  66 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  67 MODULE_LICENSE("GPL");
  68 MODULE_VERSION(ibmveth_driver_version);
  69
  70 static unsigned int tx_copybreak __read_mostly = 128;
  71 module_param(tx_copybreak, uint, 0644);
  72 MODULE_PARM_DESC(tx_copybreak,
  73         "Maximum size of packet that is copied to a new buffer on transmit");
  74
  75 static unsigned int rx_copybreak __read_mostly = 128;
  76 module_param(rx_copybreak, uint, 0644);
  77 MODULE_PARM_DESC(rx_copybreak,
  78         "Maximum size of packet that is copied to a new buffer on receive");
  79
  80 static unsigned int rx_flush __read_mostly = 0;
  81 module_param(rx_flush, uint, 0644);
  82 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  83
  84 static bool old_large_send __read_mostly;
  85 module_param(old_large_send, bool, 0444);
  86 MODULE_PARM_DESC(old_large_send,
  87         "Use old large send method on firmware that supports the new method");
  88
  89 struct ibmveth_stat {
  90         char name[ETH_GSTRING_LEN];
  91         int offset;
  92 };
  93
  94 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  95 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  96
  97 struct ibmveth_stat ibmveth_stats[] = {
  98         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  99         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
 100         { "replenish_add_buff_failure",
 101                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
 102         { "replenish_add_buff_success",
 103                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
 104         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
 105         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
 106         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
 107         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
 108         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
 109         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
 110         { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
 111         { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
 112         { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
 113 };
 114
 115 /* simple methods of getting data from the current rxq entry */
 116 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 117 {
 118         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
 119 }
 120
 121 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 122 {
 123         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 124                         IBMVETH_RXQ_TOGGLE_SHIFT;
 125 }
 126
 127 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 128 {
 129         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 130 }
 131
 132 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 133 {
 134         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 135 }
 136
 137 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 138 {
 139         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 140 }
 141
 142 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
 143 {
 144         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
 145 }
 146
 147 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 148 {
 149         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 150 }
 151
 152 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 153 {
 154         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 155 }
 156
 157 /* setup the initial settings for a buffer pool */
 158 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 159                                      u32 pool_index, u32 pool_size,
 160                                      u32 buff_size, u32 pool_active)
 161 {
 162         pool->size = pool_size;
 163         pool->index = pool_index;
 164         pool->buff_size = buff_size;
 165         pool->threshold = pool_size * 7 / 8;
 166         pool->active = pool_active;
 167 }
 168
 169 /* allocate and setup an buffer pool - called during open */
 170 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 171 {
 172         int i;
 173
 174         pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
 175
 176         if (!pool->free_map)
 177                 return -1;
 178
 179         pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
 180         if (!pool->dma_addr) {
 181                 kfree(pool->free_map);
 182                 pool->free_map = NULL;
 183                 return -1;
 184         }
 185
 186         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 187
 188         if (!pool->skbuff) {
 189                 kfree(pool->dma_addr);
 190                 pool->dma_addr = NULL;
 191
 192                 kfree(pool->free_map);
 193                 pool->free_map = NULL;
 194                 return -1;
 195         }
 196
 197         for (i = 0; i < pool->size; ++i)
 198                 pool->free_map[i] = i;
 199
 200         atomic_set(&pool->available, 0);
 201         pool->producer_index = 0;
 202         pool->consumer_index = 0;
 203
 204         return 0;
 205 }
 206
 207 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
 208 {
 209         unsigned long offset;
 210
 211         for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
 212                 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
 213 }
 214
 215 /* replenish the buffers for a pool.  note that we don't need to
 216  * skb_reserve these since they are used for incoming...
 217  */
 218 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
 219                                           struct ibmveth_buff_pool *pool)
 220 {
 221         u32 i;
 222         u32 count = pool->size - atomic_read(&pool->available);
 223         u32 buffers_added = 0;
 224         struct sk_buff *skb;
 225         unsigned int free_index, index;
 226         u64 correlator;
 227         unsigned long lpar_rc;
 228         dma_addr_t dma_addr;
 229
 230         mb();
 231
 232         for (i = 0; i < count; ++i) {
 233                 union ibmveth_buf_desc desc;
 234
 235                 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
 236
 237                 if (!skb) {
 238                         netdev_dbg(adapter->netdev,
 239                                    "replenish: unable to allocate skb\n");
 240                         adapter->replenish_no_mem++;
 241                         break;
 242                 }
 243
 244                 free_index = pool->consumer_index;
 245                 pool->consumer_index++;
 246                 if (pool->consumer_index >= pool->size)
 247                         pool->consumer_index = 0;
 248                 index = pool->free_map[free_index];
 249
 250                 BUG_ON(index == IBM_VETH_INVALID_MAP);
 251                 BUG_ON(pool->skbuff[index] != NULL);
 252
 253                 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
 254                                 pool->buff_size, DMA_FROM_DEVICE);
 255
 256                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 257                         goto failure;
 258
 259                 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
 260                 pool->dma_addr[index] = dma_addr;
 261                 pool->skbuff[index] = skb;
 262
 263                 correlator = ((u64)pool->index << 32) | index;
 264                 *(u64 *)skb->data = correlator;
 265
 266                 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
 267                 desc.fields.address = dma_addr;
 268
 269                 if (rx_flush) {
 270                         unsigned int len = min(pool->buff_size,
 271                                                 adapter->netdev->mtu +
 272                                                 IBMVETH_BUFF_OH);
 273                         ibmveth_flush_buffer(skb->data, len);
 274                 }
 275                 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
 276                                                    desc.desc);
 277
 278                 if (lpar_rc != H_SUCCESS) {
 279                         goto failure;
 280                 } else {
 281                         buffers_added++;
 282                         adapter->replenish_add_buff_success++;
 283                 }
 284         }
 285
 286         mb();
 287         atomic_add(buffers_added, &(pool->available));
 288         return;
 289
 290 failure:
 291         pool->free_map[free_index] = index;
 292         pool->skbuff[index] = NULL;
 293         if (pool->consumer_index == 0)
 294                 pool->consumer_index = pool->size - 1;
 295         else
 296                 pool->consumer_index--;
 297         if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
 298                 dma_unmap_single(&adapter->vdev->dev,
 299                                  pool->dma_addr[index], pool->buff_size,
 300                                  DMA_FROM_DEVICE);
 301         dev_kfree_skb_any(skb);
 302         adapter->replenish_add_buff_failure++;
 303
 304         mb();
 305         atomic_add(buffers_added, &(pool->available));
 306 }
 307
 308 /*
 309  * The final 8 bytes of the buffer list is a counter of frames dropped
 310  * because there was not a buffer in the buffer list capable of holding
 311  * the frame.
 312  */
 313 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
 314 {
 315         __be64 *p = adapter->buffer_list_addr + 4096 - 8;
 316
 317         adapter->rx_no_buffer = be64_to_cpup(p);
 318 }
 319
 320 /* replenish routine */
 321 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 322 {
 323         int i;
 324
 325         adapter->replenish_task_cycles++;
 326
 327         for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
 328                 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
 329
 330                 if (pool->active &&
 331                     (atomic_read(&pool->available) < pool->threshold))
 332                         ibmveth_replenish_buffer_pool(adapter, pool);
 333         }
 334
 335         ibmveth_update_rx_no_buffer(adapter);
 336 }
 337
 338 /* empty and free ana buffer pool - also used to do cleanup in error paths */
 339 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
 340                                      struct ibmveth_buff_pool *pool)
 341 {
 342         int i;
 343
 344         kfree(pool->free_map);
 345         pool->free_map = NULL;
 346
 347         if (pool->skbuff && pool->dma_addr) {
 348                 for (i = 0; i < pool->size; ++i) {
 349                         struct sk_buff *skb = pool->skbuff[i];
 350                         if (skb) {
 351                                 dma_unmap_single(&adapter->vdev->dev,
 352                                                  pool->dma_addr[i],
 353                                                  pool->buff_size,
 354                                                  DMA_FROM_DEVICE);
 355                                 dev_kfree_skb_any(skb);
 356                                 pool->skbuff[i] = NULL;
 357                         }
 358                 }
 359         }
 360
 361         if (pool->dma_addr) {
 362                 kfree(pool->dma_addr);
 363                 pool->dma_addr = NULL;
 364         }
 365
 366         if (pool->skbuff) {
 367                 kfree(pool->skbuff);
 368                 pool->skbuff = NULL;
 369         }
 370 }
 371
 372 /* remove a buffer from a pool */
 373 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
 374                                             u64 correlator)
 375 {
 376         unsigned int pool  = correlator >> 32;
 377         unsigned int index = correlator & 0xffffffffUL;
 378         unsigned int free_index;
 379         struct sk_buff *skb;
 380
 381         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 382         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 383
 384         skb = adapter->rx_buff_pool[pool].skbuff[index];
 385
 386         BUG_ON(skb == NULL);
 387
 388         adapter->rx_buff_pool[pool].skbuff[index] = NULL;
 389
 390         dma_unmap_single(&adapter->vdev->dev,
 391                          adapter->rx_buff_pool[pool].dma_addr[index],
 392                          adapter->rx_buff_pool[pool].buff_size,
 393                          DMA_FROM_DEVICE);
 394
 395         free_index = adapter->rx_buff_pool[pool].producer_index;
 396         adapter->rx_buff_pool[pool].producer_index++;
 397         if (adapter->rx_buff_pool[pool].producer_index >=
 398             adapter->rx_buff_pool[pool].size)
 399                 adapter->rx_buff_pool[pool].producer_index = 0;
 400         adapter->rx_buff_pool[pool].free_map[free_index] = index;
 401
 402         mb();
 403
 404         atomic_dec(&(adapter->rx_buff_pool[pool].available));
 405 }
 406
 407 /* get the current buffer on the rx queue */
 408 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
 409 {
 410         u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
 411         unsigned int pool = correlator >> 32;
 412         unsigned int index = correlator & 0xffffffffUL;
 413
 414         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 415         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 416
 417         return adapter->rx_buff_pool[pool].skbuff[index];
 418 }
 419
 420 /* recycle the current buffer on the rx queue */
 421 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 422 {
 423         u32 q_index = adapter->rx_queue.index;
 424         u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
 425         unsigned int pool = correlator >> 32;
 426         unsigned int index = correlator & 0xffffffffUL;
 427         union ibmveth_buf_desc desc;
 428         unsigned long lpar_rc;
 429         int ret = 1;
 430
 431         BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
 432         BUG_ON(index >= adapter->rx_buff_pool[pool].size);
 433
 434         if (!adapter->rx_buff_pool[pool].active) {
 435                 ibmveth_rxq_harvest_buffer(adapter);
 436                 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
 437                 goto out;
 438         }
 439
 440         desc.fields.flags_len = IBMVETH_BUF_VALID |
 441                 adapter->rx_buff_pool[pool].buff_size;
 442         desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 443
 444         lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
 445
 446         if (lpar_rc != H_SUCCESS) {
 447                 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
 448                            "during recycle rc=%ld", lpar_rc);
 449                 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 450                 ret = 0;
 451         }
 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 out:
 459         return ret;
 460 }
 461
 462 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
 463 {
 464         ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
 465
 466         if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
 467                 adapter->rx_queue.index = 0;
 468                 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
 469         }
 470 }
 471
 472 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 473         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 474 {
 475         int rc, try_again = 1;
 476
 477         /*
 478          * After a kexec the adapter will still be open, so our attempt to
 479          * open it will fail. So if we get a failure we free the adapter and
 480          * try again, but only once.
 481          */
 482 retry:
 483         rc = h_register_logical_lan(adapter->vdev->unit_address,
 484                                     adapter->buffer_list_dma, rxq_desc.desc,
 485                                     adapter->filter_list_dma, mac_address);
 486
 487         if (rc != H_SUCCESS && try_again) {
 488                 do {
 489                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 490                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 491
 492                 try_again = 0;
 493                 goto retry;
 494         }
 495
 496         return rc;
 497 }
 498
 499 static u64 ibmveth_encode_mac_addr(u8 *mac)
 500 {
 501         int i;
 502         u64 encoded = 0;
 503
 504         for (i = 0; i < ETH_ALEN; i++)
 505                 encoded = (encoded << 8) | mac[i];
 506
 507         return encoded;
 508 }
 509
 510 static int ibmveth_open(struct net_device *netdev)
 511 {
 512         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 513         u64 mac_address;
 514         int rxq_entries = 1;
 515         unsigned long lpar_rc;
 516         int rc;
 517         union ibmveth_buf_desc rxq_desc;
 518         int i;
 519         struct device *dev;
 520
 521         netdev_dbg(netdev, "open starting\n");
 522
 523         napi_enable(&adapter->napi);
 524
 525         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 526                 rxq_entries += adapter->rx_buff_pool[i].size;
 527
 528         rc = -ENOMEM;
 529         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 530         if (!adapter->buffer_list_addr) {
 531                 netdev_err(netdev, "unable to allocate list pages\n");
 532                 goto out;
 533         }
 534
 535         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 536         if (!adapter->filter_list_addr) {
 537                 netdev_err(netdev, "unable to allocate filter pages\n");
 538                 goto out_free_buffer_list;
 539         }
 540
 541         dev = &adapter->vdev->dev;
 542
 543         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 544                                                 rxq_entries;
 545         adapter->rx_queue.queue_addr =
 546                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 547                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 548         if (!adapter->rx_queue.queue_addr)
 549                 goto out_free_filter_list;
 550
 551         adapter->buffer_list_dma = dma_map_single(dev,
 552                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 553         if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
 554                 netdev_err(netdev, "unable to map buffer list pages\n");
 555                 goto out_free_queue_mem;
 556         }
 557
 558         adapter->filter_list_dma = dma_map_single(dev,
 559                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 560         if (dma_mapping_error(dev, adapter->filter_list_dma)) {
 561                 netdev_err(netdev, "unable to map filter list pages\n");
 562                 goto out_unmap_buffer_list;
 563         }
 564
 565         adapter->rx_queue.index = 0;
 566         adapter->rx_queue.num_slots = rxq_entries;
 567         adapter->rx_queue.toggle = 1;
 568
 569         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 570
 571         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 572                                         adapter->rx_queue.queue_len;
 573         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 574
 575         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 576         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 577         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 578
 579         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 580
 581         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 582
 583         if (lpar_rc != H_SUCCESS) {
 584                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 585                            lpar_rc);
 586                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 587                            "desc:0x%llx MAC:0x%llx\n",
 588                                      adapter->buffer_list_dma,
 589                                      adapter->filter_list_dma,
 590                                      rxq_desc.desc,
 591                                      mac_address);
 592                 rc = -ENONET;
 593                 goto out_unmap_filter_list;
 594         }
 595
 596         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 597                 if (!adapter->rx_buff_pool[i].active)
 598                         continue;
 599                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 600                         netdev_err(netdev, "unable to alloc pool\n");
 601                         adapter->rx_buff_pool[i].active = 0;
 602                         rc = -ENOMEM;
 603                         goto out_free_buffer_pools;
 604                 }
 605         }
 606
 607         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 608         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 609                          netdev);
 610         if (rc != 0) {
 611                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 612                            netdev->irq, rc);
 613                 do {
 614                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 615                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 616
 617                 goto out_free_buffer_pools;
 618         }
 619
 620         rc = -ENOMEM;
 621         adapter->bounce_buffer =
 622             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 623         if (!adapter->bounce_buffer)
 624                 goto out_free_irq;
 625
 626         adapter->bounce_buffer_dma =
 627             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 628                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 629         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 630                 netdev_err(netdev, "unable to map bounce buffer\n");
 631                 goto out_free_bounce_buffer;
 632         }
 633
 634         netdev_dbg(netdev, "initial replenish cycle\n");
 635         ibmveth_interrupt(netdev->irq, netdev);
 636
 637         netif_start_queue(netdev);
 638
 639         netdev_dbg(netdev, "open complete\n");
 640
 641         return 0;
 642
 643 out_free_bounce_buffer:
 644         kfree(adapter->bounce_buffer);
 645 out_free_irq:
 646         free_irq(netdev->irq, netdev);
 647 out_free_buffer_pools:
 648         while (--i >= 0) {
 649                 if (adapter->rx_buff_pool[i].active)
 650                         ibmveth_free_buffer_pool(adapter,
 651                                                  &adapter->rx_buff_pool[i]);
 652         }
 653 out_unmap_filter_list:
 654         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 655                          DMA_BIDIRECTIONAL);
 656 out_unmap_buffer_list:
 657         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 658                          DMA_BIDIRECTIONAL);
 659 out_free_queue_mem:
 660         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 661                           adapter->rx_queue.queue_addr,
 662                           adapter->rx_queue.queue_dma);
 663 out_free_filter_list:
 664         free_page((unsigned long)adapter->filter_list_addr);
 665 out_free_buffer_list:
 666         free_page((unsigned long)adapter->buffer_list_addr);
 667 out:
 668         napi_disable(&adapter->napi);
 669         return rc;
 670 }
 671
 672 static int ibmveth_close(struct net_device *netdev)
 673 {
 674         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 675         struct device *dev = &adapter->vdev->dev;
 676         long lpar_rc;
 677         int i;
 678
 679         netdev_dbg(netdev, "close starting\n");
 680
 681         napi_disable(&adapter->napi);
 682
 683         if (!adapter->pool_config)
 684                 netif_stop_queue(netdev);
 685
 686         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 687
 688         do {
 689                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 690         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 691
 692         if (lpar_rc != H_SUCCESS) {
 693                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 694                            "continuing with close\n", lpar_rc);
 695         }
 696
 697         free_irq(netdev->irq, netdev);
 698
 699         ibmveth_update_rx_no_buffer(adapter);
 700
 701         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 702                          DMA_BIDIRECTIONAL);
 703         free_page((unsigned long)adapter->buffer_list_addr);
 704
 705         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 706                          DMA_BIDIRECTIONAL);
 707         free_page((unsigned long)adapter->filter_list_addr);
 708
 709         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 710                           adapter->rx_queue.queue_addr,
 711                           adapter->rx_queue.queue_dma);
 712
 713         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 714                 if (adapter->rx_buff_pool[i].active)
 715                         ibmveth_free_buffer_pool(adapter,
 716                                                  &adapter->rx_buff_pool[i]);
 717
 718         dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma,
 719                          adapter->netdev->mtu + IBMVETH_BUFF_OH,
 720                          DMA_BIDIRECTIONAL);
 721         kfree(adapter->bounce_buffer);
 722
 723         netdev_dbg(netdev, "close complete\n");
 724
 725         return 0;
 726 }
 727
 728 static int netdev_get_link_ksettings(struct net_device *dev,
 729                                      struct ethtool_link_ksettings *cmd)
 730 {
 731         u32 supported, advertising;
 732
 733         supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 734                                 SUPPORTED_FIBRE);
 735         advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 736                                 ADVERTISED_FIBRE);
 737         cmd->base.speed = SPEED_1000;
 738         cmd->base.duplex = DUPLEX_FULL;
 739         cmd->base.port = PORT_FIBRE;
 740         cmd->base.phy_address = 0;
 741         cmd->base.autoneg = AUTONEG_ENABLE;
 742
 743         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 744                                                 supported);
 745         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 746                                                 advertising);
 747
 748         return 0;
 749 }
 750
 751 static void netdev_get_drvinfo(struct net_device *dev,
 752                                struct ethtool_drvinfo *info)
 753 {
 754         strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
 755         strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
 756 }
 757
 758 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
 759         netdev_features_t features)
 760 {
 761         /*
 762          * Since the ibmveth firmware interface does not have the
 763          * concept of separate tx/rx checksum offload enable, if rx
 764          * checksum is disabled we also have to disable tx checksum
 765          * offload. Once we disable rx checksum offload, we are no
 766          * longer allowed to send tx buffers that are not properly
 767          * checksummed.
 768          */
 769
 770         if (!(features & NETIF_F_RXCSUM))
 771                 features &= ~NETIF_F_CSUM_MASK;
 772
 773         return features;
 774 }
 775
 776 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 777 {
 778         struct ibmveth_adapter *adapter = netdev_priv(dev);
 779         unsigned long set_attr, clr_attr, ret_attr;
 780         unsigned long set_attr6, clr_attr6;
 781         long ret, ret4, ret6;
 782         int rc1 = 0, rc2 = 0;
 783         int restart = 0;
 784
 785         if (netif_running(dev)) {
 786                 restart = 1;
 787                 adapter->pool_config = 1;
 788                 ibmveth_close(dev);
 789                 adapter->pool_config = 0;
 790         }
 791
 792         set_attr = 0;
 793         clr_attr = 0;
 794         set_attr6 = 0;
 795         clr_attr6 = 0;
 796
 797         if (data) {
 798                 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 799                 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 800         } else {
 801                 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
 802                 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
 803         }
 804
 805         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 806
 807         if (ret == H_SUCCESS &&
 808             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 809                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 810                                          set_attr, &ret_attr);
 811
 812                 if (ret4 != H_SUCCESS) {
 813                         netdev_err(dev, "unable to change IPv4 checksum "
 814                                         "offload settings. %d rc=%ld\n",
 815                                         data, ret4);
 816
 817                         h_illan_attributes(adapter->vdev->unit_address,
 818                                            set_attr, clr_attr, &ret_attr);
 819
 820                         if (data == 1)
 821                                 dev->features &= ~NETIF_F_IP_CSUM;
 822
 823                 } else {
 824                         adapter->fw_ipv4_csum_support = data;
 825                 }
 826
 827                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 828                                          clr_attr6, set_attr6, &ret_attr);
 829
 830                 if (ret6 != H_SUCCESS) {
 831                         netdev_err(dev, "unable to change IPv6 checksum "
 832                                         "offload settings. %d rc=%ld\n",
 833                                         data, ret6);
 834
 835                         h_illan_attributes(adapter->vdev->unit_address,
 836                                            set_attr6, clr_attr6, &ret_attr);
 837
 838                         if (data == 1)
 839                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 840
 841                 } else
 842                         adapter->fw_ipv6_csum_support = data;
 843
 844                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 845                         adapter->rx_csum = data;
 846                 else
 847                         rc1 = -EIO;
 848         } else {
 849                 rc1 = -EIO;
 850                 netdev_err(dev, "unable to change checksum offload settings."
 851                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 852                                      ret_attr);
 853         }
 854
 855         if (restart)
 856                 rc2 = ibmveth_open(dev);
 857
 858         return rc1 ? rc1 : rc2;
 859 }
 860
 861 static int ibmveth_set_tso(struct net_device *dev, u32 data)
 862 {
 863         struct ibmveth_adapter *adapter = netdev_priv(dev);
 864         unsigned long set_attr, clr_attr, ret_attr;
 865         long ret1, ret2;
 866         int rc1 = 0, rc2 = 0;
 867         int restart = 0;
 868
 869         if (netif_running(dev)) {
 870                 restart = 1;
 871                 adapter->pool_config = 1;
 872                 ibmveth_close(dev);
 873                 adapter->pool_config = 0;
 874         }
 875
 876         set_attr = 0;
 877         clr_attr = 0;
 878
 879         if (data)
 880                 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 881         else
 882                 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 883
 884         ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 885
 886         if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
 887             !old_large_send) {
 888                 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 889                                           set_attr, &ret_attr);
 890
 891                 if (ret2 != H_SUCCESS) {
 892                         netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
 893                                    data, ret2);
 894
 895                         h_illan_attributes(adapter->vdev->unit_address,
 896                                            set_attr, clr_attr, &ret_attr);
 897
 898                         if (data == 1)
 899                                 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 900                         rc1 = -EIO;
 901
 902                 } else {
 903                         adapter->fw_large_send_support = data;
 904                         adapter->large_send = data;
 905                 }
 906         } else {
 907                 /* Older firmware version of large send offload does not
 908                  * support tcp6/ipv6
 909                  */
 910                 if (data == 1) {
 911                         dev->features &= ~NETIF_F_TSO6;
 912                         netdev_info(dev, "TSO feature requires all partitions to have updated driver");
 913                 }
 914                 adapter->large_send = data;
 915         }
 916
 917         if (restart)
 918                 rc2 = ibmveth_open(dev);
 919
 920         return rc1 ? rc1 : rc2;
 921 }
 922
 923 static int ibmveth_set_features(struct net_device *dev,
 924         netdev_features_t features)
 925 {
 926         struct ibmveth_adapter *adapter = netdev_priv(dev);
 927         int rx_csum = !!(features & NETIF_F_RXCSUM);
 928         int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
 929         int rc1 = 0, rc2 = 0;
 930
 931         if (rx_csum != adapter->rx_csum) {
 932                 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
 933                 if (rc1 && !adapter->rx_csum)
 934                         dev->features =
 935                                 features & ~(NETIF_F_CSUM_MASK |
 936                                              NETIF_F_RXCSUM);
 937         }
 938
 939         if (large_send != adapter->large_send) {
 940                 rc2 = ibmveth_set_tso(dev, large_send);
 941                 if (rc2 && !adapter->large_send)
 942                         dev->features =
 943                                 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
 944         }
 945
 946         return rc1 ? rc1 : rc2;
 947 }
 948
 949 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 950 {
 951         int i;
 952
 953         if (stringset != ETH_SS_STATS)
 954                 return;
 955
 956         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 957                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 958 }
 959
 960 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 961 {
 962         switch (sset) {
 963         case ETH_SS_STATS:
 964                 return ARRAY_SIZE(ibmveth_stats);
 965         default:
 966                 return -EOPNOTSUPP;
 967         }
 968 }
 969
 970 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 971                                       struct ethtool_stats *stats, u64 *data)
 972 {
 973         int i;
 974         struct ibmveth_adapter *adapter = netdev_priv(dev);
 975
 976         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 977                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 978 }
 979
 980 static const struct ethtool_ops netdev_ethtool_ops = {
 981         .get_drvinfo            = netdev_get_drvinfo,
 982         .get_link               = ethtool_op_get_link,
 983         .get_strings            = ibmveth_get_strings,
 984         .get_sset_count         = ibmveth_get_sset_count,
 985         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 986         .get_link_ksettings     = netdev_get_link_ksettings,
 987 };
 988
 989 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 990 {
 991         return -EOPNOTSUPP;
 992 }
 993
 994 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 995
 996 static int ibmveth_send(struct ibmveth_adapter *adapter,
 997                         union ibmveth_buf_desc *descs, unsigned long mss)
 998 {
 999         unsigned long correlator;
1000         unsigned int retry_count;
1001         unsigned long ret;
1002
1003         /*
1004          * The retry count sets a maximum for the number of broadcast and
1005          * multicast destinations within the system.
1006          */
1007         retry_count = 1024;
1008         correlator = 0;
1009         do {
1010                 ret = h_send_logical_lan(adapter->vdev->unit_address,
1011                                              descs[0].desc, descs[1].desc,
1012                                              descs[2].desc, descs[3].desc,
1013                                              descs[4].desc, descs[5].desc,
1014                                              correlator, &correlator, mss,
1015                                              adapter->fw_large_send_support);
1016         } while ((ret == H_BUSY) && (retry_count--));
1017
1018         if (ret != H_SUCCESS && ret != H_DROPPED) {
1019                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1020                            "with rc=%ld\n", ret);
1021                 return 1;
1022         }
1023
1024         return 0;
1025 }
1026
1027 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1028                                       struct net_device *netdev)
1029 {
1030         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1031         unsigned int desc_flags;
1032         union ibmveth_buf_desc descs[6];
1033         int last, i;
1034         int force_bounce = 0;
1035         dma_addr_t dma_addr;
1036         unsigned long mss = 0;
1037
1038         /* veth doesn't handle frag_list, so linearize the skb.
1039          * When GRO is enabled SKB's can have frag_list.
1040          */
1041         if (adapter->is_active_trunk &&
1042             skb_has_frag_list(skb) && __skb_linearize(skb)) {
1043                 netdev->stats.tx_dropped++;
1044                 goto out;
1045         }
1046
1047         /*
1048          * veth handles a maximum of 6 segments including the header, so
1049          * we have to linearize the skb if there are more than this.
1050          */
1051         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1052                 netdev->stats.tx_dropped++;
1053                 goto out;
1054         }
1055
1056         /* veth can't checksum offload UDP */
1057         if (skb->ip_summed == CHECKSUM_PARTIAL &&
1058             ((skb->protocol == htons(ETH_P_IP) &&
1059               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1060              (skb->protocol == htons(ETH_P_IPV6) &&
1061               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1062             skb_checksum_help(skb)) {
1063
1064                 netdev_err(netdev, "tx: failed to checksum packet\n");
1065                 netdev->stats.tx_dropped++;
1066                 goto out;
1067         }
1068
1069         desc_flags = IBMVETH_BUF_VALID;
1070
1071         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1072                 unsigned char *buf = skb_transport_header(skb) +
1073                                                 skb->csum_offset;
1074
1075                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1076
1077                 /* Need to zero out the checksum */
1078                 buf[0] = 0;
1079                 buf[1] = 0;
1080
1081                 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1082                         desc_flags |= IBMVETH_BUF_LRG_SND;
1083         }
1084
1085 retry_bounce:
1086         memset(descs, 0, sizeof(descs));
1087
1088         /*
1089          * If a linear packet is below the rx threshold then
1090          * copy it into the static bounce buffer. This avoids the
1091          * cost of a TCE insert and remove.
1092          */
1093         if (force_bounce || (!skb_is_nonlinear(skb) &&
1094                                 (skb->len < tx_copybreak))) {
1095                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1096                                           skb->len);
1097
1098                 descs[0].fields.flags_len = desc_flags | skb->len;
1099                 descs[0].fields.address = adapter->bounce_buffer_dma;
1100
1101                 if (ibmveth_send(adapter, descs, 0)) {
1102                         adapter->tx_send_failed++;
1103                         netdev->stats.tx_dropped++;
1104                 } else {
1105                         netdev->stats.tx_packets++;
1106                         netdev->stats.tx_bytes += skb->len;
1107                 }
1108
1109                 goto out;
1110         }
1111
1112         /* Map the header */
1113         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1114                                   skb_headlen(skb), DMA_TO_DEVICE);
1115         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1116                 goto map_failed;
1117
1118         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1119         descs[0].fields.address = dma_addr;
1120
1121         /* Map the frags */
1122         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1123                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1124
1125                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1126                                             skb_frag_size(frag), DMA_TO_DEVICE);
1127
1128                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1129                         goto map_failed_frags;
1130
1131                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1132                 descs[i+1].fields.address = dma_addr;
1133         }
1134
1135         if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1136                 if (adapter->fw_large_send_support) {
1137                         mss = (unsigned long)skb_shinfo(skb)->gso_size;
1138                         adapter->tx_large_packets++;
1139                 } else if (!skb_is_gso_v6(skb)) {
1140                         /* Put -1 in the IP checksum to tell phyp it
1141                          * is a largesend packet. Put the mss in
1142                          * the TCP checksum.
1143                          */
1144                         ip_hdr(skb)->check = 0xffff;
1145                         tcp_hdr(skb)->check =
1146                                 cpu_to_be16(skb_shinfo(skb)->gso_size);
1147                         adapter->tx_large_packets++;
1148                 }
1149         }
1150
1151         if (ibmveth_send(adapter, descs, mss)) {
1152                 adapter->tx_send_failed++;
1153                 netdev->stats.tx_dropped++;
1154         } else {
1155                 netdev->stats.tx_packets++;
1156                 netdev->stats.tx_bytes += skb->len;
1157         }
1158
1159         dma_unmap_single(&adapter->vdev->dev,
1160                          descs[0].fields.address,
1161                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1162                          DMA_TO_DEVICE);
1163
1164         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1165                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1166                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1167                                DMA_TO_DEVICE);
1168
1169 out:
1170         dev_consume_skb_any(skb);
1171         return NETDEV_TX_OK;
1172
1173 map_failed_frags:
1174         last = i+1;
1175         for (i = 1; i < last; i++)
1176                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1177                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1178                                DMA_TO_DEVICE);
1179
1180         dma_unmap_single(&adapter->vdev->dev,
1181                          descs[0].fields.address,
1182                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1183                          DMA_TO_DEVICE);
1184 map_failed:
1185         if (!firmware_has_feature(FW_FEATURE_CMO))
1186                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1187         adapter->tx_map_failed++;
1188         if (skb_linearize(skb)) {
1189                 netdev->stats.tx_dropped++;
1190                 goto out;
1191         }
1192         force_bounce = 1;
1193         goto retry_bounce;
1194 }
1195
1196 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1197 {
1198         struct tcphdr *tcph;
1199         int offset = 0;
1200         int hdr_len;
1201
1202         /* only TCP packets will be aggregated */
1203         if (skb->protocol == htons(ETH_P_IP)) {
1204                 struct iphdr *iph = (struct iphdr *)skb->data;
1205
1206                 if (iph->protocol == IPPROTO_TCP) {
1207                         offset = iph->ihl * 4;
1208                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1209                 } else {
1210                         return;
1211                 }
1212         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1213                 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1214
1215                 if (iph6->nexthdr == IPPROTO_TCP) {
1216                         offset = sizeof(struct ipv6hdr);
1217                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1218                 } else {
1219                         return;
1220                 }
1221         } else {
1222                 return;
1223         }
1224         /* if mss is not set through Large Packet bit/mss in rx buffer,
1225          * expect that the mss will be written to the tcp header checksum.
1226          */
1227         tcph = (struct tcphdr *)(skb->data + offset);
1228         if (lrg_pkt) {
1229                 skb_shinfo(skb)->gso_size = mss;
1230         } else if (offset) {
1231                 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1232                 tcph->check = 0;
1233         }
1234
1235         if (skb_shinfo(skb)->gso_size) {
1236                 hdr_len = offset + tcph->doff * 4;
1237                 skb_shinfo(skb)->gso_segs =
1238                                 DIV_ROUND_UP(skb->len - hdr_len,
1239                                              skb_shinfo(skb)->gso_size);
1240         }
1241 }
1242
1243 static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1244                                    struct ibmveth_adapter *adapter)
1245 {
1246         struct iphdr *iph = NULL;
1247         struct ipv6hdr *iph6 = NULL;
1248         __be16 skb_proto = 0;
1249         u16 iphlen = 0;
1250         u16 iph_proto = 0;
1251         u16 tcphdrlen = 0;
1252
1253         skb_proto = be16_to_cpu(skb->protocol);
1254
1255         if (skb_proto == ETH_P_IP) {
1256                 iph = (struct iphdr *)skb->data;
1257
1258                 /* If the IP checksum is not offloaded and if the packet
1259                  *  is large send, the checksum must be rebuilt.
1260                  */
1261                 if (iph->check == 0xffff) {
1262                         iph->check = 0;
1263                         iph->check = ip_fast_csum((unsigned char *)iph,
1264                                                   iph->ihl);
1265                 }
1266
1267                 iphlen = iph->ihl * 4;
1268                 iph_proto = iph->protocol;
1269         } else if (skb_proto == ETH_P_IPV6) {
1270                 iph6 = (struct ipv6hdr *)skb->data;
1271                 iphlen = sizeof(struct ipv6hdr);
1272                 iph_proto = iph6->nexthdr;
1273         }
1274
1275         /* In OVS environment, when a flow is not cached, specifically for a
1276          * new TCP connection, the first packet information is passed up
1277          * the user space for finding a flow. During this process, OVS computes
1278          * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1279          *
1280          * Given that we zeroed out TCP checksum field in transmit path
1281          * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1282          * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1283          * in the packet. This leads to OVS dropping the packet and hence
1284          * TCP retransmissions are seen.
1285          *
1286          * So, re-compute TCP pseudo header checksum.
1287          */
1288         if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1289                 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1290
1291                 tcphdrlen = skb->len - iphlen;
1292
1293                 /* Recompute TCP pseudo header checksum */
1294                 if (skb_proto == ETH_P_IP)
1295                         tcph->check = ~csum_tcpudp_magic(iph->saddr,
1296                                         iph->daddr, tcphdrlen, iph_proto, 0);
1297                 else if (skb_proto == ETH_P_IPV6)
1298                         tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1299                                         &iph6->daddr, tcphdrlen, iph_proto, 0);
1300
1301                 /* Setup SKB fields for checksum offload */
1302                 skb_partial_csum_set(skb, iphlen,
1303                                      offsetof(struct tcphdr, check));
1304                 skb_reset_network_header(skb);
1305         }
1306 }
1307
1308 static int ibmveth_poll(struct napi_struct *napi, int budget)
1309 {
1310         struct ibmveth_adapter *adapter =
1311                         container_of(napi, struct ibmveth_adapter, napi);
1312         struct net_device *netdev = adapter->netdev;
1313         int frames_processed = 0;
1314         unsigned long lpar_rc;
1315         u16 mss = 0;
1316
1317         while (frames_processed < budget) {
1318                 if (!ibmveth_rxq_pending_buffer(adapter))
1319                         break;
1320
1321                 smp_rmb();
1322                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1323                         wmb(); /* suggested by larson1 */
1324                         adapter->rx_invalid_buffer++;
1325                         netdev_dbg(netdev, "recycling invalid buffer\n");
1326                         ibmveth_rxq_recycle_buffer(adapter);
1327                 } else {
1328                         struct sk_buff *skb, *new_skb;
1329                         int length = ibmveth_rxq_frame_length(adapter);
1330                         int offset = ibmveth_rxq_frame_offset(adapter);
1331                         int csum_good = ibmveth_rxq_csum_good(adapter);
1332                         int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1333                         __sum16 iph_check = 0;
1334
1335                         skb = ibmveth_rxq_get_buffer(adapter);
1336
1337                         /* if the large packet bit is set in the rx queue
1338                          * descriptor, the mss will be written by PHYP eight
1339                          * bytes from the start of the rx buffer, which is
1340                          * skb->data at this stage
1341                          */
1342                         if (lrg_pkt) {
1343                                 __be64 *rxmss = (__be64 *)(skb->data + 8);
1344
1345                                 mss = (u16)be64_to_cpu(*rxmss);
1346                         }
1347
1348                         new_skb = NULL;
1349                         if (length < rx_copybreak)
1350                                 new_skb = netdev_alloc_skb(netdev, length);
1351
1352                         if (new_skb) {
1353                                 skb_copy_to_linear_data(new_skb,
1354                                                         skb->data + offset,
1355                                                         length);
1356                                 if (rx_flush)
1357                                         ibmveth_flush_buffer(skb->data,
1358                                                 length + offset);
1359                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1360                                         kfree_skb(skb);
1361                                 skb = new_skb;
1362                         } else {
1363                                 ibmveth_rxq_harvest_buffer(adapter);
1364                                 skb_reserve(skb, offset);
1365                         }
1366
1367                         skb_put(skb, length);
1368                         skb->protocol = eth_type_trans(skb, netdev);
1369
1370                         /* PHYP without PLSO support places a -1 in the ip
1371                          * checksum for large send frames.
1372                          */
1373                         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
1374                                 struct iphdr *iph = (struct iphdr *)skb->data;
1375
1376                                 iph_check = iph->check;
1377                         }
1378
1379                         if ((length > netdev->mtu + ETH_HLEN) ||
1380                             lrg_pkt || iph_check == 0xffff) {
1381                                 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1382                                 adapter->rx_large_packets++;
1383                         }
1384
1385                         if (csum_good) {
1386                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1387                                 ibmveth_rx_csum_helper(skb, adapter);
1388                         }
1389
1390                         napi_gro_receive(napi, skb);    /* send it up */
1391
1392                         netdev->stats.rx_packets++;
1393                         netdev->stats.rx_bytes += length;
1394                         frames_processed++;
1395                 }
1396         }
1397
1398         ibmveth_replenish_task(adapter);
1399
1400         if (frames_processed < budget) {
1401                 napi_complete_done(napi, frames_processed);
1402
1403                 /* We think we are done - reenable interrupts,
1404                  * then check once more to make sure we are done.
1405                  */
1406                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1407                                        VIO_IRQ_ENABLE);
1408
1409                 BUG_ON(lpar_rc != H_SUCCESS);
1410
1411                 if (ibmveth_rxq_pending_buffer(adapter) &&
1412                     napi_reschedule(napi)) {
1413                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1414                                                VIO_IRQ_DISABLE);
1415                 }
1416         }
1417
1418         return frames_processed;
1419 }
1420
1421 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1422 {
1423         struct net_device *netdev = dev_instance;
1424         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1425         unsigned long lpar_rc;
1426
1427         if (napi_schedule_prep(&adapter->napi)) {
1428                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1429                                        VIO_IRQ_DISABLE);
1430                 BUG_ON(lpar_rc != H_SUCCESS);
1431                 __napi_schedule(&adapter->napi);
1432         }
1433         return IRQ_HANDLED;
1434 }
1435
1436 static void ibmveth_set_multicast_list(struct net_device *netdev)
1437 {
1438         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1439         unsigned long lpar_rc;
1440
1441         if ((netdev->flags & IFF_PROMISC) ||
1442             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1443                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1444                                            IbmVethMcastEnableRecv |
1445                                            IbmVethMcastDisableFiltering,
1446                                            0);
1447                 if (lpar_rc != H_SUCCESS) {
1448                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1449                                    "entering promisc mode\n", lpar_rc);
1450                 }
1451         } else {
1452                 struct netdev_hw_addr *ha;
1453                 /* clear the filter table & disable filtering */
1454                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1455                                            IbmVethMcastEnableRecv |
1456                                            IbmVethMcastDisableFiltering |
1457                                            IbmVethMcastClearFilterTable,
1458                                            0);
1459                 if (lpar_rc != H_SUCCESS) {
1460                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1461                                    "attempting to clear filter table\n",
1462                                    lpar_rc);
1463                 }
1464                 /* add the addresses to the filter table */
1465                 netdev_for_each_mc_addr(ha, netdev) {
1466                         /* add the multicast address to the filter table */
1467                         u64 mcast_addr;
1468                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1469                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1470                                                    IbmVethMcastAddFilter,
1471                                                    mcast_addr);
1472                         if (lpar_rc != H_SUCCESS) {
1473                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1474                                            "when adding an entry to the filter "
1475                                            "table\n", lpar_rc);
1476                         }
1477                 }
1478
1479                 /* re-enable filtering */
1480                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1481                                            IbmVethMcastEnableFiltering,
1482                                            0);
1483                 if (lpar_rc != H_SUCCESS) {
1484                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1485                                    "enabling filtering\n", lpar_rc);
1486                 }
1487         }
1488 }
1489
1490 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1491 {
1492         struct ibmveth_adapter *adapter = netdev_priv(dev);
1493         struct vio_dev *viodev = adapter->vdev;
1494         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1495         int i, rc;
1496         int need_restart = 0;
1497
1498         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1499                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1500                         break;
1501
1502         if (i == IBMVETH_NUM_BUFF_POOLS)
1503                 return -EINVAL;
1504
1505         /* Deactivate all the buffer pools so that the next loop can activate
1506            only the buffer pools necessary to hold the new MTU */
1507         if (netif_running(adapter->netdev)) {
1508                 need_restart = 1;
1509                 adapter->pool_config = 1;
1510                 ibmveth_close(adapter->netdev);
1511                 adapter->pool_config = 0;
1512         }
1513
1514         /* Look for an active buffer pool that can hold the new MTU */
1515         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1516                 adapter->rx_buff_pool[i].active = 1;
1517
1518                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1519                         dev->mtu = new_mtu;
1520                         vio_cmo_set_dev_desired(viodev,
1521                                                 ibmveth_get_desired_dma
1522                                                 (viodev));
1523                         if (need_restart) {
1524                                 return ibmveth_open(adapter->netdev);
1525                         }
1526                         return 0;
1527                 }
1528         }
1529
1530         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1531                 return rc;
1532
1533         return -EINVAL;
1534 }
1535
1536 #ifdef CONFIG_NET_POLL_CONTROLLER
1537 static void ibmveth_poll_controller(struct net_device *dev)
1538 {
1539         ibmveth_replenish_task(netdev_priv(dev));
1540         ibmveth_interrupt(dev->irq, dev);
1541 }
1542 #endif
1543
1544 /**
1545  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1546  *
1547  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1548  *
1549  * Return value:
1550  *      Number of bytes of IO data the driver will need to perform well.
1551  */
1552 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1553 {
1554         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1555         struct ibmveth_adapter *adapter;
1556         struct iommu_table *tbl;
1557         unsigned long ret;
1558         int i;
1559         int rxqentries = 1;
1560
1561         tbl = get_iommu_table_base(&vdev->dev);
1562
1563         /* netdev inits at probe time along with the structures we need below*/
1564         if (netdev == NULL)
1565                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1566
1567         adapter = netdev_priv(netdev);
1568
1569         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1570         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1571
1572         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1573                 /* add the size of the active receive buffers */
1574                 if (adapter->rx_buff_pool[i].active)
1575                         ret +=
1576                             adapter->rx_buff_pool[i].size *
1577                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1578                                              buff_size, tbl);
1579                 rxqentries += adapter->rx_buff_pool[i].size;
1580         }
1581         /* add the size of the receive queue entries */
1582         ret += IOMMU_PAGE_ALIGN(
1583                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1584
1585         return ret;
1586 }
1587
1588 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1589 {
1590         struct ibmveth_adapter *adapter = netdev_priv(dev);
1591         struct sockaddr *addr = p;
1592         u64 mac_address;
1593         int rc;
1594
1595         if (!is_valid_ether_addr(addr->sa_data))
1596                 return -EADDRNOTAVAIL;
1597
1598         mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1599         rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1600         if (rc) {
1601                 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1602                 return rc;
1603         }
1604
1605         ether_addr_copy(dev->dev_addr, addr->sa_data);
1606
1607         return 0;
1608 }
1609
1610 static const struct net_device_ops ibmveth_netdev_ops = {
1611         .ndo_open               = ibmveth_open,
1612         .ndo_stop               = ibmveth_close,
1613         .ndo_start_xmit         = ibmveth_start_xmit,
1614         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1615         .ndo_do_ioctl           = ibmveth_ioctl,
1616         .ndo_change_mtu         = ibmveth_change_mtu,
1617         .ndo_fix_features       = ibmveth_fix_features,
1618         .ndo_set_features       = ibmveth_set_features,
1619         .ndo_validate_addr      = eth_validate_addr,
1620         .ndo_set_mac_address    = ibmveth_set_mac_addr,
1621 #ifdef CONFIG_NET_POLL_CONTROLLER
1622         .ndo_poll_controller    = ibmveth_poll_controller,
1623 #endif
1624 };
1625
1626 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1627 {
1628         int rc, i, mac_len;
1629         struct net_device *netdev;
1630         struct ibmveth_adapter *adapter;
1631         unsigned char *mac_addr_p;
1632         __be32 *mcastFilterSize_p;
1633         long ret;
1634         unsigned long ret_attr;
1635
1636         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1637                 dev->unit_address);
1638
1639         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1640                                                         &mac_len);
1641         if (!mac_addr_p) {
1642                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1643                 return -EINVAL;
1644         }
1645         /* Workaround for old/broken pHyp */
1646         if (mac_len == 8)
1647                 mac_addr_p += 2;
1648         else if (mac_len != 6) {
1649                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1650                         mac_len);
1651                 return -EINVAL;
1652         }
1653
1654         mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1655                                                         VETH_MCAST_FILTER_SIZE,
1656                                                         NULL);
1657         if (!mcastFilterSize_p) {
1658                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1659                         "attribute\n");
1660                 return -EINVAL;
1661         }
1662
1663         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1664
1665         if (!netdev)
1666                 return -ENOMEM;
1667
1668         adapter = netdev_priv(netdev);
1669         dev_set_drvdata(&dev->dev, netdev);
1670
1671         adapter->vdev = dev;
1672         adapter->netdev = netdev;
1673         adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1674         adapter->pool_config = 0;
1675
1676         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1677
1678         netdev->irq = dev->irq;
1679         netdev->netdev_ops = &ibmveth_netdev_ops;
1680         netdev->ethtool_ops = &netdev_ethtool_ops;
1681         SET_NETDEV_DEV(netdev, &dev->dev);
1682         netdev->hw_features = NETIF_F_SG;
1683         if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1684                 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1685                                        NETIF_F_RXCSUM;
1686         }
1687
1688         netdev->features |= netdev->hw_features;
1689
1690         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1691
1692         /* If running older firmware, TSO should not be enabled by default */
1693         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1694             !old_large_send) {
1695                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1696                 netdev->features |= netdev->hw_features;
1697         } else {
1698                 netdev->hw_features |= NETIF_F_TSO;
1699         }
1700
1701         adapter->is_active_trunk = false;
1702         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1703                 adapter->is_active_trunk = true;
1704                 netdev->hw_features |= NETIF_F_FRAGLIST;
1705                 netdev->features |= NETIF_F_FRAGLIST;
1706         }
1707
1708         netdev->min_mtu = IBMVETH_MIN_MTU;
1709         netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
1710
1711         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1712
1713         if (firmware_has_feature(FW_FEATURE_CMO))
1714                 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1715
1716         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1717                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1718                 int error;
1719
1720                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1721                                          pool_count[i], pool_size[i],
1722                                          pool_active[i]);
1723                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1724                                              &dev->dev.kobj, "pool%d", i);
1725                 if (!error)
1726                         kobject_uevent(kobj, KOBJ_ADD);
1727         }
1728
1729         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1730         netdev_dbg(netdev, "registering netdev...\n");
1731
1732         ibmveth_set_features(netdev, netdev->features);
1733
1734         rc = register_netdev(netdev);
1735
1736         if (rc) {
1737                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1738                 free_netdev(netdev);
1739                 return rc;
1740         }
1741
1742         netdev_dbg(netdev, "registered\n");
1743
1744         return 0;
1745 }
1746
1747 static int ibmveth_remove(struct vio_dev *dev)
1748 {
1749         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1750         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1751         int i;
1752
1753         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1754                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1755
1756         unregister_netdev(netdev);
1757
1758         free_netdev(netdev);
1759         dev_set_drvdata(&dev->dev, NULL);
1760
1761         return 0;
1762 }
1763
1764 static struct attribute veth_active_attr;
1765 static struct attribute veth_num_attr;
1766 static struct attribute veth_size_attr;
1767
1768 static ssize_t veth_pool_show(struct kobject *kobj,
1769                               struct attribute *attr, char *buf)
1770 {
1771         struct ibmveth_buff_pool *pool = container_of(kobj,
1772                                                       struct ibmveth_buff_pool,
1773                                                       kobj);
1774
1775         if (attr == &veth_active_attr)
1776                 return sprintf(buf, "%d\n", pool->active);
1777         else if (attr == &veth_num_attr)
1778                 return sprintf(buf, "%d\n", pool->size);
1779         else if (attr == &veth_size_attr)
1780                 return sprintf(buf, "%d\n", pool->buff_size);
1781         return 0;
1782 }
1783
1784 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1785                                const char *buf, size_t count)
1786 {
1787         struct ibmveth_buff_pool *pool = container_of(kobj,
1788                                                       struct ibmveth_buff_pool,
1789                                                       kobj);
1790         struct net_device *netdev = dev_get_drvdata(
1791             container_of(kobj->parent, struct device, kobj));
1792         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1793         long value = simple_strtol(buf, NULL, 10);
1794         long rc;
1795
1796         if (attr == &veth_active_attr) {
1797                 if (value && !pool->active) {
1798                         if (netif_running(netdev)) {
1799                                 if (ibmveth_alloc_buffer_pool(pool)) {
1800                                         netdev_err(netdev,
1801                                                    "unable to alloc pool\n");
1802                                         return -ENOMEM;
1803                                 }
1804                                 pool->active = 1;
1805                                 adapter->pool_config = 1;
1806                                 ibmveth_close(netdev);
1807                                 adapter->pool_config = 0;
1808                                 if ((rc = ibmveth_open(netdev)))
1809                                         return rc;
1810                         } else {
1811                                 pool->active = 1;
1812                         }
1813                 } else if (!value && pool->active) {
1814                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1815                         int i;
1816                         /* Make sure there is a buffer pool with buffers that
1817                            can hold a packet of the size of the MTU */
1818                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1819                                 if (pool == &adapter->rx_buff_pool[i])
1820                                         continue;
1821                                 if (!adapter->rx_buff_pool[i].active)
1822                                         continue;
1823                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1824                                         break;
1825                         }
1826
1827                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1828                                 netdev_err(netdev, "no active pool >= MTU\n");
1829                                 return -EPERM;
1830                         }
1831
1832                         if (netif_running(netdev)) {
1833                                 adapter->pool_config = 1;
1834                                 ibmveth_close(netdev);
1835                                 pool->active = 0;
1836                                 adapter->pool_config = 0;
1837                                 if ((rc = ibmveth_open(netdev)))
1838                                         return rc;
1839                         }
1840                         pool->active = 0;
1841                 }
1842         } else if (attr == &veth_num_attr) {
1843                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1844                         return -EINVAL;
1845                 } else {
1846                         if (netif_running(netdev)) {
1847                                 adapter->pool_config = 1;
1848                                 ibmveth_close(netdev);
1849                                 adapter->pool_config = 0;
1850                                 pool->size = value;
1851                                 if ((rc = ibmveth_open(netdev)))
1852                                         return rc;
1853                         } else {
1854                                 pool->size = value;
1855                         }
1856                 }
1857         } else if (attr == &veth_size_attr) {
1858                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1859                         return -EINVAL;
1860                 } else {
1861                         if (netif_running(netdev)) {
1862                                 adapter->pool_config = 1;
1863                                 ibmveth_close(netdev);
1864                                 adapter->pool_config = 0;
1865                                 pool->buff_size = value;
1866                                 if ((rc = ibmveth_open(netdev)))
1867                                         return rc;
1868                         } else {
1869                                 pool->buff_size = value;
1870                         }
1871                 }
1872         }
1873
1874         /* kick the interrupt handler to allocate/deallocate pools */
1875         ibmveth_interrupt(netdev->irq, netdev);
1876         return count;
1877 }
1878
1879
1880 #define ATTR(_name, _mode)                              \
1881         struct attribute veth_##_name##_attr = {        \
1882         .name = __stringify(_name), .mode = _mode,      \
1883         };
1884
1885 static ATTR(active, 0644);
1886 static ATTR(num, 0644);
1887 static ATTR(size, 0644);
1888
1889 static struct attribute *veth_pool_attrs[] = {
1890         &veth_active_attr,
1891         &veth_num_attr,
1892         &veth_size_attr,
1893         NULL,
1894 };
1895
1896 static const struct sysfs_ops veth_pool_ops = {
1897         .show   = veth_pool_show,
1898         .store  = veth_pool_store,
1899 };
1900
1901 static struct kobj_type ktype_veth_pool = {
1902         .release        = NULL,
1903         .sysfs_ops      = &veth_pool_ops,
1904         .default_attrs  = veth_pool_attrs,
1905 };
1906
1907 static int ibmveth_resume(struct device *dev)
1908 {
1909         struct net_device *netdev = dev_get_drvdata(dev);
1910         ibmveth_interrupt(netdev->irq, netdev);
1911         return 0;
1912 }
1913
1914 static const struct vio_device_id ibmveth_device_table[] = {
1915         { "network", "IBM,l-lan"},
1916         { "", "" }
1917 };
1918 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1919
1920 static const struct dev_pm_ops ibmveth_pm_ops = {
1921         .resume = ibmveth_resume
1922 };
1923
1924 static struct vio_driver ibmveth_driver = {
1925         .id_table       = ibmveth_device_table,
1926         .probe          = ibmveth_probe,
1927         .remove         = ibmveth_remove,
1928         .get_desired_dma = ibmveth_get_desired_dma,
1929         .name           = ibmveth_driver_name,
1930         .pm             = &ibmveth_pm_ops,
1931 };
1932
1933 static int __init ibmveth_module_init(void)
1934 {
1935         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1936                ibmveth_driver_string, ibmveth_driver_version);
1937
1938         return vio_register_driver(&ibmveth_driver);
1939 }
1940
1941 static void __exit ibmveth_module_exit(void)
1942 {
1943         vio_unregister_driver(&ibmveth_driver);
1944 }
1945
1946 module_init(ibmveth_module_init);
1947 module_exit(ibmveth_module_exit);