drivers/net/ethernet/ibm/ibmveth.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * IBM Power Virtual Ethernet Device Driver
   4  *
   5  * Copyright (C) IBM Corporation, 2003, 2010
   6  *
   7  * Authors: Dave Larson <larson1@us.ibm.com>
   8  *          Santiago Leon <santil@linux.vnet.ibm.com>
   9  *          Brian King <brking@linux.vnet.ibm.com>
  10  *          Robert Jennings <rcj@linux.vnet.ibm.com>
  11  *          Anton Blanchard <anton@au.ibm.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/errno.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/kernel.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/etherdevice.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/mm.h>
  25 #include <linux/pm.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/in.h>
  28 #include <linux/ip.h>
  29 #include <linux/ipv6.h>
  30 #include <linux/slab.h>
  31 #include <asm/hvcall.h>
  32 #include <linux/atomic.h>
  33 #include <asm/vio.h>
  34 #include <asm/iommu.h>
  35 #include <asm/firmware.h>
  36 #include <net/tcp.h>
  37 #include <net/ip6_checksum.h>
  38
  39 #include "ibmveth.h"
  40
  41 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  42 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  43 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  44
  45 static struct kobj_type ktype_veth_pool;
  46
  47
  48 static const char ibmveth_driver_name[] = "ibmveth";
  49 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  50 #define ibmveth_driver_version "1.06"
  51
  52 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  53 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  54 MODULE_LICENSE("GPL");
  55 MODULE_VERSION(ibmveth_driver_version);
  56
  57 static unsigned int tx_copybreak __read_mostly = 128;
  58 module_param(tx_copybreak, uint, 0644);
  59 MODULE_PARM_DESC(tx_copybreak,
  60         "Maximum size of packet that is copied to a new buffer on transmit");
  61
  62 static unsigned int rx_copybreak __read_mostly = 128;
  63 module_param(rx_copybreak, uint, 0644);
  64 MODULE_PARM_DESC(rx_copybreak,
  65         "Maximum size of packet that is copied to a new buffer on receive");
  66
  67 static unsigned int rx_flush __read_mostly = 0;
  68 module_param(rx_flush, uint, 0644);
  69 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  70
  71 static bool old_large_send __read_mostly;
  72 module_param(old_large_send, bool, 0444);
  73 MODULE_PARM_DESC(old_large_send,
  74         "Use old large send method on firmware that supports the new method");
  75
  76 struct ibmveth_stat {
  77         char name[ETH_GSTRING_LEN];
  78         int offset;
  79 };
  80
  81 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
  82 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
  83
  84 static struct ibmveth_stat ibmveth_stats[] = {
  85         { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
  86         { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
  87         { "replenish_add_buff_failure",
  88                         IBMVETH_STAT_OFF(replenish_add_buff_failure) },
  89         { "replenish_add_buff_success",
  90                         IBMVETH_STAT_OFF(replenish_add_buff_success) },
  91         { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
  92         { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
  93         { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
  94         { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
  95         { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
  96         { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
  97         { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
  98         { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
  99         { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
 100 };
 101
 102 /* simple methods of getting data from the current rxq entry */
 103 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
 104 {
 105         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
 106 }
 107
 108 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
 109 {
 110         return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
 111                         IBMVETH_RXQ_TOGGLE_SHIFT;
 112 }
 113
 114 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 115 {
 116         return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 117 }
 118
 119 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 120 {
 121         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 122 }
 123
 124 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 125 {
 126         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 127 }
 128
 129 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
 130 {
 131         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
 132 }
 133
 134 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 135 {
 136         return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
 137 }
 138
 139 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
 140 {
 141         return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
 142 }
 143
 144 /* setup the initial settings for a buffer pool */
 145 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
 146                                      u32 pool_index, u32 pool_size,
 147                                      u32 buff_size, u32 pool_active)
 148 {
 149         pool->size = pool_size;
 150         pool->index = pool_index;
 151         pool->buff_size = buff_size;
 152         pool->threshold = pool_size * 7 / 8;
 153         pool->active = pool_active;
 154 }
 155
 156 /* allocate and setup an buffer pool - called during open */
 157 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 158 {
 159         int i;
 160
 161         pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
 162
 163         if (!pool->free_map)
 164                 return -1;
 165
 166         pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
 167         if (!pool->dma_addr) {
 168                 kfree(pool->free_map);
 169                 pool->free_map = NULL;
 170                 return -1;
 171         }
 172
 173         pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
 174
 175         if (!pool->skbuff) {
 176                 kfree(pool->dma_addr);
 177                 pool->dma_addr = NULL;
 178
 179                 kfree(pool->free_map);
 180                 pool->free_map = NULL;
 181                 return -1;
 182         }
 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 int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
 460         union ibmveth_buf_desc rxq_desc, u64 mac_address)
 461 {
 462         int rc, try_again = 1;
 463
 464         /*
 465          * After a kexec the adapter will still be open, so our attempt to
 466          * open it will fail. So if we get a failure we free the adapter and
 467          * try again, but only once.
 468          */
 469 retry:
 470         rc = h_register_logical_lan(adapter->vdev->unit_address,
 471                                     adapter->buffer_list_dma, rxq_desc.desc,
 472                                     adapter->filter_list_dma, mac_address);
 473
 474         if (rc != H_SUCCESS && try_again) {
 475                 do {
 476                         rc = h_free_logical_lan(adapter->vdev->unit_address);
 477                 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
 478
 479                 try_again = 0;
 480                 goto retry;
 481         }
 482
 483         return rc;
 484 }
 485
 486 static u64 ibmveth_encode_mac_addr(u8 *mac)
 487 {
 488         int i;
 489         u64 encoded = 0;
 490
 491         for (i = 0; i < ETH_ALEN; i++)
 492                 encoded = (encoded << 8) | mac[i];
 493
 494         return encoded;
 495 }
 496
 497 static int ibmveth_open(struct net_device *netdev)
 498 {
 499         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 500         u64 mac_address;
 501         int rxq_entries = 1;
 502         unsigned long lpar_rc;
 503         int rc;
 504         union ibmveth_buf_desc rxq_desc;
 505         int i;
 506         struct device *dev;
 507
 508         netdev_dbg(netdev, "open starting\n");
 509
 510         napi_enable(&adapter->napi);
 511
 512         for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 513                 rxq_entries += adapter->rx_buff_pool[i].size;
 514
 515         rc = -ENOMEM;
 516         adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 517         if (!adapter->buffer_list_addr) {
 518                 netdev_err(netdev, "unable to allocate list pages\n");
 519                 goto out;
 520         }
 521
 522         adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 523         if (!adapter->filter_list_addr) {
 524                 netdev_err(netdev, "unable to allocate filter pages\n");
 525                 goto out_free_buffer_list;
 526         }
 527
 528         dev = &adapter->vdev->dev;
 529
 530         adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
 531                                                 rxq_entries;
 532         adapter->rx_queue.queue_addr =
 533                 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
 534                                    &adapter->rx_queue.queue_dma, GFP_KERNEL);
 535         if (!adapter->rx_queue.queue_addr)
 536                 goto out_free_filter_list;
 537
 538         adapter->buffer_list_dma = dma_map_single(dev,
 539                         adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
 540         if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
 541                 netdev_err(netdev, "unable to map buffer list pages\n");
 542                 goto out_free_queue_mem;
 543         }
 544
 545         adapter->filter_list_dma = dma_map_single(dev,
 546                         adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
 547         if (dma_mapping_error(dev, adapter->filter_list_dma)) {
 548                 netdev_err(netdev, "unable to map filter list pages\n");
 549                 goto out_unmap_buffer_list;
 550         }
 551
 552         adapter->rx_queue.index = 0;
 553         adapter->rx_queue.num_slots = rxq_entries;
 554         adapter->rx_queue.toggle = 1;
 555
 556         mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
 557
 558         rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
 559                                         adapter->rx_queue.queue_len;
 560         rxq_desc.fields.address = adapter->rx_queue.queue_dma;
 561
 562         netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
 563         netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
 564         netdev_dbg(netdev, "receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 565
 566         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 567
 568         lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
 569
 570         if (lpar_rc != H_SUCCESS) {
 571                 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
 572                            lpar_rc);
 573                 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
 574                            "desc:0x%llx MAC:0x%llx\n",
 575                                      adapter->buffer_list_dma,
 576                                      adapter->filter_list_dma,
 577                                      rxq_desc.desc,
 578                                      mac_address);
 579                 rc = -ENONET;
 580                 goto out_unmap_filter_list;
 581         }
 582
 583         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
 584                 if (!adapter->rx_buff_pool[i].active)
 585                         continue;
 586                 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
 587                         netdev_err(netdev, "unable to alloc pool\n");
 588                         adapter->rx_buff_pool[i].active = 0;
 589                         rc = -ENOMEM;
 590                         goto out_free_buffer_pools;
 591                 }
 592         }
 593
 594         netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
 595         rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
 596                          netdev);
 597         if (rc != 0) {
 598                 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
 599                            netdev->irq, rc);
 600                 do {
 601                         lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 602                 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 603
 604                 goto out_free_buffer_pools;
 605         }
 606
 607         rc = -ENOMEM;
 608         adapter->bounce_buffer =
 609             kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
 610         if (!adapter->bounce_buffer)
 611                 goto out_free_irq;
 612
 613         adapter->bounce_buffer_dma =
 614             dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
 615                            netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
 616         if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
 617                 netdev_err(netdev, "unable to map bounce buffer\n");
 618                 goto out_free_bounce_buffer;
 619         }
 620
 621         netdev_dbg(netdev, "initial replenish cycle\n");
 622         ibmveth_interrupt(netdev->irq, netdev);
 623
 624         netif_start_queue(netdev);
 625
 626         netdev_dbg(netdev, "open complete\n");
 627
 628         return 0;
 629
 630 out_free_bounce_buffer:
 631         kfree(adapter->bounce_buffer);
 632 out_free_irq:
 633         free_irq(netdev->irq, netdev);
 634 out_free_buffer_pools:
 635         while (--i >= 0) {
 636                 if (adapter->rx_buff_pool[i].active)
 637                         ibmveth_free_buffer_pool(adapter,
 638                                                  &adapter->rx_buff_pool[i]);
 639         }
 640 out_unmap_filter_list:
 641         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 642                          DMA_BIDIRECTIONAL);
 643 out_unmap_buffer_list:
 644         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 645                          DMA_BIDIRECTIONAL);
 646 out_free_queue_mem:
 647         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 648                           adapter->rx_queue.queue_addr,
 649                           adapter->rx_queue.queue_dma);
 650 out_free_filter_list:
 651         free_page((unsigned long)adapter->filter_list_addr);
 652 out_free_buffer_list:
 653         free_page((unsigned long)adapter->buffer_list_addr);
 654 out:
 655         napi_disable(&adapter->napi);
 656         return rc;
 657 }
 658
 659 static int ibmveth_close(struct net_device *netdev)
 660 {
 661         struct ibmveth_adapter *adapter = netdev_priv(netdev);
 662         struct device *dev = &adapter->vdev->dev;
 663         long lpar_rc;
 664         int i;
 665
 666         netdev_dbg(netdev, "close starting\n");
 667
 668         napi_disable(&adapter->napi);
 669
 670         if (!adapter->pool_config)
 671                 netif_stop_queue(netdev);
 672
 673         h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
 674
 675         do {
 676                 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
 677         } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
 678
 679         if (lpar_rc != H_SUCCESS) {
 680                 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
 681                            "continuing with close\n", lpar_rc);
 682         }
 683
 684         free_irq(netdev->irq, netdev);
 685
 686         ibmveth_update_rx_no_buffer(adapter);
 687
 688         dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 689                          DMA_BIDIRECTIONAL);
 690         free_page((unsigned long)adapter->buffer_list_addr);
 691
 692         dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 693                          DMA_BIDIRECTIONAL);
 694         free_page((unsigned long)adapter->filter_list_addr);
 695
 696         dma_free_coherent(dev, adapter->rx_queue.queue_len,
 697                           adapter->rx_queue.queue_addr,
 698                           adapter->rx_queue.queue_dma);
 699
 700         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 701                 if (adapter->rx_buff_pool[i].active)
 702                         ibmveth_free_buffer_pool(adapter,
 703                                                  &adapter->rx_buff_pool[i]);
 704
 705         dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma,
 706                          adapter->netdev->mtu + IBMVETH_BUFF_OH,
 707                          DMA_BIDIRECTIONAL);
 708         kfree(adapter->bounce_buffer);
 709
 710         netdev_dbg(netdev, "close complete\n");
 711
 712         return 0;
 713 }
 714
 715 static int netdev_get_link_ksettings(struct net_device *dev,
 716                                      struct ethtool_link_ksettings *cmd)
 717 {
 718         u32 supported, advertising;
 719
 720         supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
 721                                 SUPPORTED_FIBRE);
 722         advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
 723                                 ADVERTISED_FIBRE);
 724         cmd->base.speed = SPEED_1000;
 725         cmd->base.duplex = DUPLEX_FULL;
 726         cmd->base.port = PORT_FIBRE;
 727         cmd->base.phy_address = 0;
 728         cmd->base.autoneg = AUTONEG_ENABLE;
 729
 730         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
 731                                                 supported);
 732         ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
 733                                                 advertising);
 734
 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_CSUM_MASK;
 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 &&
 795             (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
 796                 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 797                                          set_attr, &ret_attr);
 798
 799                 if (ret4 != H_SUCCESS) {
 800                         netdev_err(dev, "unable to change IPv4 checksum "
 801                                         "offload settings. %d rc=%ld\n",
 802                                         data, ret4);
 803
 804                         h_illan_attributes(adapter->vdev->unit_address,
 805                                            set_attr, clr_attr, &ret_attr);
 806
 807                         if (data == 1)
 808                                 dev->features &= ~NETIF_F_IP_CSUM;
 809
 810                 } else {
 811                         adapter->fw_ipv4_csum_support = data;
 812                 }
 813
 814                 ret6 = h_illan_attributes(adapter->vdev->unit_address,
 815                                          clr_attr6, set_attr6, &ret_attr);
 816
 817                 if (ret6 != H_SUCCESS) {
 818                         netdev_err(dev, "unable to change IPv6 checksum "
 819                                         "offload settings. %d rc=%ld\n",
 820                                         data, ret6);
 821
 822                         h_illan_attributes(adapter->vdev->unit_address,
 823                                            set_attr6, clr_attr6, &ret_attr);
 824
 825                         if (data == 1)
 826                                 dev->features &= ~NETIF_F_IPV6_CSUM;
 827
 828                 } else
 829                         adapter->fw_ipv6_csum_support = data;
 830
 831                 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
 832                         adapter->rx_csum = data;
 833                 else
 834                         rc1 = -EIO;
 835         } else {
 836                 rc1 = -EIO;
 837                 netdev_err(dev, "unable to change checksum offload settings."
 838                                      " %d rc=%ld ret_attr=%lx\n", data, ret,
 839                                      ret_attr);
 840         }
 841
 842         if (restart)
 843                 rc2 = ibmveth_open(dev);
 844
 845         return rc1 ? rc1 : rc2;
 846 }
 847
 848 static int ibmveth_set_tso(struct net_device *dev, u32 data)
 849 {
 850         struct ibmveth_adapter *adapter = netdev_priv(dev);
 851         unsigned long set_attr, clr_attr, ret_attr;
 852         long ret1, ret2;
 853         int rc1 = 0, rc2 = 0;
 854         int restart = 0;
 855
 856         if (netif_running(dev)) {
 857                 restart = 1;
 858                 adapter->pool_config = 1;
 859                 ibmveth_close(dev);
 860                 adapter->pool_config = 0;
 861         }
 862
 863         set_attr = 0;
 864         clr_attr = 0;
 865
 866         if (data)
 867                 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 868         else
 869                 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
 870
 871         ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
 872
 873         if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
 874             !old_large_send) {
 875                 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
 876                                           set_attr, &ret_attr);
 877
 878                 if (ret2 != H_SUCCESS) {
 879                         netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
 880                                    data, ret2);
 881
 882                         h_illan_attributes(adapter->vdev->unit_address,
 883                                            set_attr, clr_attr, &ret_attr);
 884
 885                         if (data == 1)
 886                                 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
 887                         rc1 = -EIO;
 888
 889                 } else {
 890                         adapter->fw_large_send_support = data;
 891                         adapter->large_send = data;
 892                 }
 893         } else {
 894                 /* Older firmware version of large send offload does not
 895                  * support tcp6/ipv6
 896                  */
 897                 if (data == 1) {
 898                         dev->features &= ~NETIF_F_TSO6;
 899                         netdev_info(dev, "TSO feature requires all partitions to have updated driver");
 900                 }
 901                 adapter->large_send = data;
 902         }
 903
 904         if (restart)
 905                 rc2 = ibmveth_open(dev);
 906
 907         return rc1 ? rc1 : rc2;
 908 }
 909
 910 static int ibmveth_set_features(struct net_device *dev,
 911         netdev_features_t features)
 912 {
 913         struct ibmveth_adapter *adapter = netdev_priv(dev);
 914         int rx_csum = !!(features & NETIF_F_RXCSUM);
 915         int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
 916         int rc1 = 0, rc2 = 0;
 917
 918         if (rx_csum != adapter->rx_csum) {
 919                 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
 920                 if (rc1 && !adapter->rx_csum)
 921                         dev->features =
 922                                 features & ~(NETIF_F_CSUM_MASK |
 923                                              NETIF_F_RXCSUM);
 924         }
 925
 926         if (large_send != adapter->large_send) {
 927                 rc2 = ibmveth_set_tso(dev, large_send);
 928                 if (rc2 && !adapter->large_send)
 929                         dev->features =
 930                                 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
 931         }
 932
 933         return rc1 ? rc1 : rc2;
 934 }
 935
 936 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
 937 {
 938         int i;
 939
 940         if (stringset != ETH_SS_STATS)
 941                 return;
 942
 943         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
 944                 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
 945 }
 946
 947 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
 948 {
 949         switch (sset) {
 950         case ETH_SS_STATS:
 951                 return ARRAY_SIZE(ibmveth_stats);
 952         default:
 953                 return -EOPNOTSUPP;
 954         }
 955 }
 956
 957 static void ibmveth_get_ethtool_stats(struct net_device *dev,
 958                                       struct ethtool_stats *stats, u64 *data)
 959 {
 960         int i;
 961         struct ibmveth_adapter *adapter = netdev_priv(dev);
 962
 963         for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
 964                 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
 965 }
 966
 967 static const struct ethtool_ops netdev_ethtool_ops = {
 968         .get_drvinfo            = netdev_get_drvinfo,
 969         .get_link               = ethtool_op_get_link,
 970         .get_strings            = ibmveth_get_strings,
 971         .get_sset_count         = ibmveth_get_sset_count,
 972         .get_ethtool_stats      = ibmveth_get_ethtool_stats,
 973         .get_link_ksettings     = netdev_get_link_ksettings,
 974 };
 975
 976 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 977 {
 978         return -EOPNOTSUPP;
 979 }
 980
 981 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
 982
 983 static int ibmveth_send(struct ibmveth_adapter *adapter,
 984                         union ibmveth_buf_desc *descs, unsigned long mss)
 985 {
 986         unsigned long correlator;
 987         unsigned int retry_count;
 988         unsigned long ret;
 989
 990         /*
 991          * The retry count sets a maximum for the number of broadcast and
 992          * multicast destinations within the system.
 993          */
 994         retry_count = 1024;
 995         correlator = 0;
 996         do {
 997                 ret = h_send_logical_lan(adapter->vdev->unit_address,
 998                                              descs[0].desc, descs[1].desc,
 999                                              descs[2].desc, descs[3].desc,
1000                                              descs[4].desc, descs[5].desc,
1001                                              correlator, &correlator, mss,
1002                                              adapter->fw_large_send_support);
1003         } while ((ret == H_BUSY) && (retry_count--));
1004
1005         if (ret != H_SUCCESS && ret != H_DROPPED) {
1006                 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1007                            "with rc=%ld\n", ret);
1008                 return 1;
1009         }
1010
1011         return 0;
1012 }
1013
1014 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1015                                       struct net_device *netdev)
1016 {
1017         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1018         unsigned int desc_flags;
1019         union ibmveth_buf_desc descs[6];
1020         int last, i;
1021         int force_bounce = 0;
1022         dma_addr_t dma_addr;
1023         unsigned long mss = 0;
1024
1025         /* veth doesn't handle frag_list, so linearize the skb.
1026          * When GRO is enabled SKB's can have frag_list.
1027          */
1028         if (adapter->is_active_trunk &&
1029             skb_has_frag_list(skb) && __skb_linearize(skb)) {
1030                 netdev->stats.tx_dropped++;
1031                 goto out;
1032         }
1033
1034         /*
1035          * veth handles a maximum of 6 segments including the header, so
1036          * we have to linearize the skb if there are more than this.
1037          */
1038         if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1039                 netdev->stats.tx_dropped++;
1040                 goto out;
1041         }
1042
1043         /* veth can't checksum offload UDP */
1044         if (skb->ip_summed == CHECKSUM_PARTIAL &&
1045             ((skb->protocol == htons(ETH_P_IP) &&
1046               ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1047              (skb->protocol == htons(ETH_P_IPV6) &&
1048               ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1049             skb_checksum_help(skb)) {
1050
1051                 netdev_err(netdev, "tx: failed to checksum packet\n");
1052                 netdev->stats.tx_dropped++;
1053                 goto out;
1054         }
1055
1056         desc_flags = IBMVETH_BUF_VALID;
1057
1058         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1059                 unsigned char *buf = skb_transport_header(skb) +
1060                                                 skb->csum_offset;
1061
1062                 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1063
1064                 /* Need to zero out the checksum */
1065                 buf[0] = 0;
1066                 buf[1] = 0;
1067
1068                 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1069                         desc_flags |= IBMVETH_BUF_LRG_SND;
1070         }
1071
1072 retry_bounce:
1073         memset(descs, 0, sizeof(descs));
1074
1075         /*
1076          * If a linear packet is below the rx threshold then
1077          * copy it into the static bounce buffer. This avoids the
1078          * cost of a TCE insert and remove.
1079          */
1080         if (force_bounce || (!skb_is_nonlinear(skb) &&
1081                                 (skb->len < tx_copybreak))) {
1082                 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1083                                           skb->len);
1084
1085                 descs[0].fields.flags_len = desc_flags | skb->len;
1086                 descs[0].fields.address = adapter->bounce_buffer_dma;
1087
1088                 if (ibmveth_send(adapter, descs, 0)) {
1089                         adapter->tx_send_failed++;
1090                         netdev->stats.tx_dropped++;
1091                 } else {
1092                         netdev->stats.tx_packets++;
1093                         netdev->stats.tx_bytes += skb->len;
1094                 }
1095
1096                 goto out;
1097         }
1098
1099         /* Map the header */
1100         dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1101                                   skb_headlen(skb), DMA_TO_DEVICE);
1102         if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1103                 goto map_failed;
1104
1105         descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1106         descs[0].fields.address = dma_addr;
1107
1108         /* Map the frags */
1109         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1110                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1111
1112                 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1113                                             skb_frag_size(frag), DMA_TO_DEVICE);
1114
1115                 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1116                         goto map_failed_frags;
1117
1118                 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1119                 descs[i+1].fields.address = dma_addr;
1120         }
1121
1122         if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1123                 if (adapter->fw_large_send_support) {
1124                         mss = (unsigned long)skb_shinfo(skb)->gso_size;
1125                         adapter->tx_large_packets++;
1126                 } else if (!skb_is_gso_v6(skb)) {
1127                         /* Put -1 in the IP checksum to tell phyp it
1128                          * is a largesend packet. Put the mss in
1129                          * the TCP checksum.
1130                          */
1131                         ip_hdr(skb)->check = 0xffff;
1132                         tcp_hdr(skb)->check =
1133                                 cpu_to_be16(skb_shinfo(skb)->gso_size);
1134                         adapter->tx_large_packets++;
1135                 }
1136         }
1137
1138         if (ibmveth_send(adapter, descs, mss)) {
1139                 adapter->tx_send_failed++;
1140                 netdev->stats.tx_dropped++;
1141         } else {
1142                 netdev->stats.tx_packets++;
1143                 netdev->stats.tx_bytes += skb->len;
1144         }
1145
1146         dma_unmap_single(&adapter->vdev->dev,
1147                          descs[0].fields.address,
1148                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1149                          DMA_TO_DEVICE);
1150
1151         for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1152                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1153                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1154                                DMA_TO_DEVICE);
1155
1156 out:
1157         dev_consume_skb_any(skb);
1158         return NETDEV_TX_OK;
1159
1160 map_failed_frags:
1161         last = i+1;
1162         for (i = 1; i < last; i++)
1163                 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1164                                descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1165                                DMA_TO_DEVICE);
1166
1167         dma_unmap_single(&adapter->vdev->dev,
1168                          descs[0].fields.address,
1169                          descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1170                          DMA_TO_DEVICE);
1171 map_failed:
1172         if (!firmware_has_feature(FW_FEATURE_CMO))
1173                 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1174         adapter->tx_map_failed++;
1175         if (skb_linearize(skb)) {
1176                 netdev->stats.tx_dropped++;
1177                 goto out;
1178         }
1179         force_bounce = 1;
1180         goto retry_bounce;
1181 }
1182
1183 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1184 {
1185         struct tcphdr *tcph;
1186         int offset = 0;
1187         int hdr_len;
1188
1189         /* only TCP packets will be aggregated */
1190         if (skb->protocol == htons(ETH_P_IP)) {
1191                 struct iphdr *iph = (struct iphdr *)skb->data;
1192
1193                 if (iph->protocol == IPPROTO_TCP) {
1194                         offset = iph->ihl * 4;
1195                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1196                 } else {
1197                         return;
1198                 }
1199         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1200                 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1201
1202                 if (iph6->nexthdr == IPPROTO_TCP) {
1203                         offset = sizeof(struct ipv6hdr);
1204                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1205                 } else {
1206                         return;
1207                 }
1208         } else {
1209                 return;
1210         }
1211         /* if mss is not set through Large Packet bit/mss in rx buffer,
1212          * expect that the mss will be written to the tcp header checksum.
1213          */
1214         tcph = (struct tcphdr *)(skb->data + offset);
1215         if (lrg_pkt) {
1216                 skb_shinfo(skb)->gso_size = mss;
1217         } else if (offset) {
1218                 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1219                 tcph->check = 0;
1220         }
1221
1222         if (skb_shinfo(skb)->gso_size) {
1223                 hdr_len = offset + tcph->doff * 4;
1224                 skb_shinfo(skb)->gso_segs =
1225                                 DIV_ROUND_UP(skb->len - hdr_len,
1226                                              skb_shinfo(skb)->gso_size);
1227         }
1228 }
1229
1230 static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1231                                    struct ibmveth_adapter *adapter)
1232 {
1233         struct iphdr *iph = NULL;
1234         struct ipv6hdr *iph6 = NULL;
1235         __be16 skb_proto = 0;
1236         u16 iphlen = 0;
1237         u16 iph_proto = 0;
1238         u16 tcphdrlen = 0;
1239
1240         skb_proto = be16_to_cpu(skb->protocol);
1241
1242         if (skb_proto == ETH_P_IP) {
1243                 iph = (struct iphdr *)skb->data;
1244
1245                 /* If the IP checksum is not offloaded and if the packet
1246                  *  is large send, the checksum must be rebuilt.
1247                  */
1248                 if (iph->check == 0xffff) {
1249                         iph->check = 0;
1250                         iph->check = ip_fast_csum((unsigned char *)iph,
1251                                                   iph->ihl);
1252                 }
1253
1254                 iphlen = iph->ihl * 4;
1255                 iph_proto = iph->protocol;
1256         } else if (skb_proto == ETH_P_IPV6) {
1257                 iph6 = (struct ipv6hdr *)skb->data;
1258                 iphlen = sizeof(struct ipv6hdr);
1259                 iph_proto = iph6->nexthdr;
1260         }
1261
1262         /* In OVS environment, when a flow is not cached, specifically for a
1263          * new TCP connection, the first packet information is passed up
1264          * the user space for finding a flow. During this process, OVS computes
1265          * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1266          *
1267          * Given that we zeroed out TCP checksum field in transmit path
1268          * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1269          * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1270          * in the packet. This leads to OVS dropping the packet and hence
1271          * TCP retransmissions are seen.
1272          *
1273          * So, re-compute TCP pseudo header checksum.
1274          */
1275         if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1276                 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1277
1278                 tcphdrlen = skb->len - iphlen;
1279
1280                 /* Recompute TCP pseudo header checksum */
1281                 if (skb_proto == ETH_P_IP)
1282                         tcph->check = ~csum_tcpudp_magic(iph->saddr,
1283                                         iph->daddr, tcphdrlen, iph_proto, 0);
1284                 else if (skb_proto == ETH_P_IPV6)
1285                         tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1286                                         &iph6->daddr, tcphdrlen, iph_proto, 0);
1287
1288                 /* Setup SKB fields for checksum offload */
1289                 skb_partial_csum_set(skb, iphlen,
1290                                      offsetof(struct tcphdr, check));
1291                 skb_reset_network_header(skb);
1292         }
1293 }
1294
1295 static int ibmveth_poll(struct napi_struct *napi, int budget)
1296 {
1297         struct ibmveth_adapter *adapter =
1298                         container_of(napi, struct ibmveth_adapter, napi);
1299         struct net_device *netdev = adapter->netdev;
1300         int frames_processed = 0;
1301         unsigned long lpar_rc;
1302         u16 mss = 0;
1303
1304         while (frames_processed < budget) {
1305                 if (!ibmveth_rxq_pending_buffer(adapter))
1306                         break;
1307
1308                 smp_rmb();
1309                 if (!ibmveth_rxq_buffer_valid(adapter)) {
1310                         wmb(); /* suggested by larson1 */
1311                         adapter->rx_invalid_buffer++;
1312                         netdev_dbg(netdev, "recycling invalid buffer\n");
1313                         ibmveth_rxq_recycle_buffer(adapter);
1314                 } else {
1315                         struct sk_buff *skb, *new_skb;
1316                         int length = ibmveth_rxq_frame_length(adapter);
1317                         int offset = ibmveth_rxq_frame_offset(adapter);
1318                         int csum_good = ibmveth_rxq_csum_good(adapter);
1319                         int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1320
1321                         skb = ibmveth_rxq_get_buffer(adapter);
1322
1323                         /* if the large packet bit is set in the rx queue
1324                          * descriptor, the mss will be written by PHYP eight
1325                          * bytes from the start of the rx buffer, which is
1326                          * skb->data at this stage
1327                          */
1328                         if (lrg_pkt) {
1329                                 __be64 *rxmss = (__be64 *)(skb->data + 8);
1330
1331                                 mss = (u16)be64_to_cpu(*rxmss);
1332                         }
1333
1334                         new_skb = NULL;
1335                         if (length < rx_copybreak)
1336                                 new_skb = netdev_alloc_skb(netdev, length);
1337
1338                         if (new_skb) {
1339                                 skb_copy_to_linear_data(new_skb,
1340                                                         skb->data + offset,
1341                                                         length);
1342                                 if (rx_flush)
1343                                         ibmveth_flush_buffer(skb->data,
1344                                                 length + offset);
1345                                 if (!ibmveth_rxq_recycle_buffer(adapter))
1346                                         kfree_skb(skb);
1347                                 skb = new_skb;
1348                         } else {
1349                                 ibmveth_rxq_harvest_buffer(adapter);
1350                                 skb_reserve(skb, offset);
1351                         }
1352
1353                         skb_put(skb, length);
1354                         skb->protocol = eth_type_trans(skb, netdev);
1355
1356                         if (csum_good) {
1357                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1358                                 ibmveth_rx_csum_helper(skb, adapter);
1359                         }
1360
1361                         if (length > netdev->mtu + ETH_HLEN) {
1362                                 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1363                                 adapter->rx_large_packets++;
1364                         }
1365
1366                         napi_gro_receive(napi, skb);    /* send it up */
1367
1368                         netdev->stats.rx_packets++;
1369                         netdev->stats.rx_bytes += length;
1370                         frames_processed++;
1371                 }
1372         }
1373
1374         ibmveth_replenish_task(adapter);
1375
1376         if (frames_processed < budget) {
1377                 napi_complete_done(napi, frames_processed);
1378
1379                 /* We think we are done - reenable interrupts,
1380                  * then check once more to make sure we are done.
1381                  */
1382                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1383                                        VIO_IRQ_ENABLE);
1384
1385                 BUG_ON(lpar_rc != H_SUCCESS);
1386
1387                 if (ibmveth_rxq_pending_buffer(adapter) &&
1388                     napi_reschedule(napi)) {
1389                         lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1390                                                VIO_IRQ_DISABLE);
1391                 }
1392         }
1393
1394         return frames_processed;
1395 }
1396
1397 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1398 {
1399         struct net_device *netdev = dev_instance;
1400         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1401         unsigned long lpar_rc;
1402
1403         if (napi_schedule_prep(&adapter->napi)) {
1404                 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1405                                        VIO_IRQ_DISABLE);
1406                 BUG_ON(lpar_rc != H_SUCCESS);
1407                 __napi_schedule(&adapter->napi);
1408         }
1409         return IRQ_HANDLED;
1410 }
1411
1412 static void ibmveth_set_multicast_list(struct net_device *netdev)
1413 {
1414         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1415         unsigned long lpar_rc;
1416
1417         if ((netdev->flags & IFF_PROMISC) ||
1418             (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1419                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1420                                            IbmVethMcastEnableRecv |
1421                                            IbmVethMcastDisableFiltering,
1422                                            0);
1423                 if (lpar_rc != H_SUCCESS) {
1424                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1425                                    "entering promisc mode\n", lpar_rc);
1426                 }
1427         } else {
1428                 struct netdev_hw_addr *ha;
1429                 /* clear the filter table & disable filtering */
1430                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1431                                            IbmVethMcastEnableRecv |
1432                                            IbmVethMcastDisableFiltering |
1433                                            IbmVethMcastClearFilterTable,
1434                                            0);
1435                 if (lpar_rc != H_SUCCESS) {
1436                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1437                                    "attempting to clear filter table\n",
1438                                    lpar_rc);
1439                 }
1440                 /* add the addresses to the filter table */
1441                 netdev_for_each_mc_addr(ha, netdev) {
1442                         /* add the multicast address to the filter table */
1443                         u64 mcast_addr;
1444                         mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1445                         lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1446                                                    IbmVethMcastAddFilter,
1447                                                    mcast_addr);
1448                         if (lpar_rc != H_SUCCESS) {
1449                                 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1450                                            "when adding an entry to the filter "
1451                                            "table\n", lpar_rc);
1452                         }
1453                 }
1454
1455                 /* re-enable filtering */
1456                 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1457                                            IbmVethMcastEnableFiltering,
1458                                            0);
1459                 if (lpar_rc != H_SUCCESS) {
1460                         netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1461                                    "enabling filtering\n", lpar_rc);
1462                 }
1463         }
1464 }
1465
1466 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1467 {
1468         struct ibmveth_adapter *adapter = netdev_priv(dev);
1469         struct vio_dev *viodev = adapter->vdev;
1470         int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1471         int i, rc;
1472         int need_restart = 0;
1473
1474         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1475                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1476                         break;
1477
1478         if (i == IBMVETH_NUM_BUFF_POOLS)
1479                 return -EINVAL;
1480
1481         /* Deactivate all the buffer pools so that the next loop can activate
1482            only the buffer pools necessary to hold the new MTU */
1483         if (netif_running(adapter->netdev)) {
1484                 need_restart = 1;
1485                 adapter->pool_config = 1;
1486                 ibmveth_close(adapter->netdev);
1487                 adapter->pool_config = 0;
1488         }
1489
1490         /* Look for an active buffer pool that can hold the new MTU */
1491         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1492                 adapter->rx_buff_pool[i].active = 1;
1493
1494                 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1495                         dev->mtu = new_mtu;
1496                         vio_cmo_set_dev_desired(viodev,
1497                                                 ibmveth_get_desired_dma
1498                                                 (viodev));
1499                         if (need_restart) {
1500                                 return ibmveth_open(adapter->netdev);
1501                         }
1502                         return 0;
1503                 }
1504         }
1505
1506         if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1507                 return rc;
1508
1509         return -EINVAL;
1510 }
1511
1512 #ifdef CONFIG_NET_POLL_CONTROLLER
1513 static void ibmveth_poll_controller(struct net_device *dev)
1514 {
1515         ibmveth_replenish_task(netdev_priv(dev));
1516         ibmveth_interrupt(dev->irq, dev);
1517 }
1518 #endif
1519
1520 /**
1521  * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1522  *
1523  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1524  *
1525  * Return value:
1526  *      Number of bytes of IO data the driver will need to perform well.
1527  */
1528 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1529 {
1530         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1531         struct ibmveth_adapter *adapter;
1532         struct iommu_table *tbl;
1533         unsigned long ret;
1534         int i;
1535         int rxqentries = 1;
1536
1537         tbl = get_iommu_table_base(&vdev->dev);
1538
1539         /* netdev inits at probe time along with the structures we need below*/
1540         if (netdev == NULL)
1541                 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1542
1543         adapter = netdev_priv(netdev);
1544
1545         ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1546         ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1547
1548         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1549                 /* add the size of the active receive buffers */
1550                 if (adapter->rx_buff_pool[i].active)
1551                         ret +=
1552                             adapter->rx_buff_pool[i].size *
1553                             IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1554                                              buff_size, tbl);
1555                 rxqentries += adapter->rx_buff_pool[i].size;
1556         }
1557         /* add the size of the receive queue entries */
1558         ret += IOMMU_PAGE_ALIGN(
1559                 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1560
1561         return ret;
1562 }
1563
1564 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1565 {
1566         struct ibmveth_adapter *adapter = netdev_priv(dev);
1567         struct sockaddr *addr = p;
1568         u64 mac_address;
1569         int rc;
1570
1571         if (!is_valid_ether_addr(addr->sa_data))
1572                 return -EADDRNOTAVAIL;
1573
1574         mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1575         rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1576         if (rc) {
1577                 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1578                 return rc;
1579         }
1580
1581         ether_addr_copy(dev->dev_addr, addr->sa_data);
1582
1583         return 0;
1584 }
1585
1586 static const struct net_device_ops ibmveth_netdev_ops = {
1587         .ndo_open               = ibmveth_open,
1588         .ndo_stop               = ibmveth_close,
1589         .ndo_start_xmit         = ibmveth_start_xmit,
1590         .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1591         .ndo_do_ioctl           = ibmveth_ioctl,
1592         .ndo_change_mtu         = ibmveth_change_mtu,
1593         .ndo_fix_features       = ibmveth_fix_features,
1594         .ndo_set_features       = ibmveth_set_features,
1595         .ndo_validate_addr      = eth_validate_addr,
1596         .ndo_set_mac_address    = ibmveth_set_mac_addr,
1597 #ifdef CONFIG_NET_POLL_CONTROLLER
1598         .ndo_poll_controller    = ibmveth_poll_controller,
1599 #endif
1600 };
1601
1602 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1603 {
1604         int rc, i, mac_len;
1605         struct net_device *netdev;
1606         struct ibmveth_adapter *adapter;
1607         unsigned char *mac_addr_p;
1608         __be32 *mcastFilterSize_p;
1609         long ret;
1610         unsigned long ret_attr;
1611
1612         dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1613                 dev->unit_address);
1614
1615         mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1616                                                         &mac_len);
1617         if (!mac_addr_p) {
1618                 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1619                 return -EINVAL;
1620         }
1621         /* Workaround for old/broken pHyp */
1622         if (mac_len == 8)
1623                 mac_addr_p += 2;
1624         else if (mac_len != 6) {
1625                 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1626                         mac_len);
1627                 return -EINVAL;
1628         }
1629
1630         mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1631                                                         VETH_MCAST_FILTER_SIZE,
1632                                                         NULL);
1633         if (!mcastFilterSize_p) {
1634                 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1635                         "attribute\n");
1636                 return -EINVAL;
1637         }
1638
1639         netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1640
1641         if (!netdev)
1642                 return -ENOMEM;
1643
1644         adapter = netdev_priv(netdev);
1645         dev_set_drvdata(&dev->dev, netdev);
1646
1647         adapter->vdev = dev;
1648         adapter->netdev = netdev;
1649         adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1650         adapter->pool_config = 0;
1651
1652         netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1653
1654         netdev->irq = dev->irq;
1655         netdev->netdev_ops = &ibmveth_netdev_ops;
1656         netdev->ethtool_ops = &netdev_ethtool_ops;
1657         SET_NETDEV_DEV(netdev, &dev->dev);
1658         netdev->hw_features = NETIF_F_SG;
1659         if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1660                 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1661                                        NETIF_F_RXCSUM;
1662         }
1663
1664         netdev->features |= netdev->hw_features;
1665
1666         ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1667
1668         /* If running older firmware, TSO should not be enabled by default */
1669         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1670             !old_large_send) {
1671                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1672                 netdev->features |= netdev->hw_features;
1673         } else {
1674                 netdev->hw_features |= NETIF_F_TSO;
1675         }
1676
1677         adapter->is_active_trunk = false;
1678         if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1679                 adapter->is_active_trunk = true;
1680                 netdev->hw_features |= NETIF_F_FRAGLIST;
1681                 netdev->features |= NETIF_F_FRAGLIST;
1682         }
1683
1684         netdev->min_mtu = IBMVETH_MIN_MTU;
1685         netdev->max_mtu = ETH_MAX_MTU;
1686
1687         memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1688
1689         if (firmware_has_feature(FW_FEATURE_CMO))
1690                 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1691
1692         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1693                 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1694                 int error;
1695
1696                 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1697                                          pool_count[i], pool_size[i],
1698                                          pool_active[i]);
1699                 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1700                                              &dev->dev.kobj, "pool%d", i);
1701                 if (!error)
1702                         kobject_uevent(kobj, KOBJ_ADD);
1703         }
1704
1705         netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1706         netdev_dbg(netdev, "registering netdev...\n");
1707
1708         ibmveth_set_features(netdev, netdev->features);
1709
1710         rc = register_netdev(netdev);
1711
1712         if (rc) {
1713                 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1714                 free_netdev(netdev);
1715                 return rc;
1716         }
1717
1718         netdev_dbg(netdev, "registered\n");
1719
1720         return 0;
1721 }
1722
1723 static int ibmveth_remove(struct vio_dev *dev)
1724 {
1725         struct net_device *netdev = dev_get_drvdata(&dev->dev);
1726         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1727         int i;
1728
1729         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1730                 kobject_put(&adapter->rx_buff_pool[i].kobj);
1731
1732         unregister_netdev(netdev);
1733
1734         free_netdev(netdev);
1735         dev_set_drvdata(&dev->dev, NULL);
1736
1737         return 0;
1738 }
1739
1740 static struct attribute veth_active_attr;
1741 static struct attribute veth_num_attr;
1742 static struct attribute veth_size_attr;
1743
1744 static ssize_t veth_pool_show(struct kobject *kobj,
1745                               struct attribute *attr, char *buf)
1746 {
1747         struct ibmveth_buff_pool *pool = container_of(kobj,
1748                                                       struct ibmveth_buff_pool,
1749                                                       kobj);
1750
1751         if (attr == &veth_active_attr)
1752                 return sprintf(buf, "%d\n", pool->active);
1753         else if (attr == &veth_num_attr)
1754                 return sprintf(buf, "%d\n", pool->size);
1755         else if (attr == &veth_size_attr)
1756                 return sprintf(buf, "%d\n", pool->buff_size);
1757         return 0;
1758 }
1759
1760 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1761                                const char *buf, size_t count)
1762 {
1763         struct ibmveth_buff_pool *pool = container_of(kobj,
1764                                                       struct ibmveth_buff_pool,
1765                                                       kobj);
1766         struct net_device *netdev = dev_get_drvdata(
1767             container_of(kobj->parent, struct device, kobj));
1768         struct ibmveth_adapter *adapter = netdev_priv(netdev);
1769         long value = simple_strtol(buf, NULL, 10);
1770         long rc;
1771
1772         if (attr == &veth_active_attr) {
1773                 if (value && !pool->active) {
1774                         if (netif_running(netdev)) {
1775                                 if (ibmveth_alloc_buffer_pool(pool)) {
1776                                         netdev_err(netdev,
1777                                                    "unable to alloc pool\n");
1778                                         return -ENOMEM;
1779                                 }
1780                                 pool->active = 1;
1781                                 adapter->pool_config = 1;
1782                                 ibmveth_close(netdev);
1783                                 adapter->pool_config = 0;
1784                                 if ((rc = ibmveth_open(netdev)))
1785                                         return rc;
1786                         } else {
1787                                 pool->active = 1;
1788                         }
1789                 } else if (!value && pool->active) {
1790                         int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1791                         int i;
1792                         /* Make sure there is a buffer pool with buffers that
1793                            can hold a packet of the size of the MTU */
1794                         for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1795                                 if (pool == &adapter->rx_buff_pool[i])
1796                                         continue;
1797                                 if (!adapter->rx_buff_pool[i].active)
1798                                         continue;
1799                                 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1800                                         break;
1801                         }
1802
1803                         if (i == IBMVETH_NUM_BUFF_POOLS) {
1804                                 netdev_err(netdev, "no active pool >= MTU\n");
1805                                 return -EPERM;
1806                         }
1807
1808                         if (netif_running(netdev)) {
1809                                 adapter->pool_config = 1;
1810                                 ibmveth_close(netdev);
1811                                 pool->active = 0;
1812                                 adapter->pool_config = 0;
1813                                 if ((rc = ibmveth_open(netdev)))
1814                                         return rc;
1815                         }
1816                         pool->active = 0;
1817                 }
1818         } else if (attr == &veth_num_attr) {
1819                 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1820                         return -EINVAL;
1821                 } else {
1822                         if (netif_running(netdev)) {
1823                                 adapter->pool_config = 1;
1824                                 ibmveth_close(netdev);
1825                                 adapter->pool_config = 0;
1826                                 pool->size = value;
1827                                 if ((rc = ibmveth_open(netdev)))
1828                                         return rc;
1829                         } else {
1830                                 pool->size = value;
1831                         }
1832                 }
1833         } else if (attr == &veth_size_attr) {
1834                 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1835                         return -EINVAL;
1836                 } else {
1837                         if (netif_running(netdev)) {
1838                                 adapter->pool_config = 1;
1839                                 ibmveth_close(netdev);
1840                                 adapter->pool_config = 0;
1841                                 pool->buff_size = value;
1842                                 if ((rc = ibmveth_open(netdev)))
1843                                         return rc;
1844                         } else {
1845                                 pool->buff_size = value;
1846                         }
1847                 }
1848         }
1849
1850         /* kick the interrupt handler to allocate/deallocate pools */
1851         ibmveth_interrupt(netdev->irq, netdev);
1852         return count;
1853 }
1854
1855
1856 #define ATTR(_name, _mode)                              \
1857         struct attribute veth_##_name##_attr = {        \
1858         .name = __stringify(_name), .mode = _mode,      \
1859         };
1860
1861 static ATTR(active, 0644);
1862 static ATTR(num, 0644);
1863 static ATTR(size, 0644);
1864
1865 static struct attribute *veth_pool_attrs[] = {
1866         &veth_active_attr,
1867         &veth_num_attr,
1868         &veth_size_attr,
1869         NULL,
1870 };
1871
1872 static const struct sysfs_ops veth_pool_ops = {
1873         .show   = veth_pool_show,
1874         .store  = veth_pool_store,
1875 };
1876
1877 static struct kobj_type ktype_veth_pool = {
1878         .release        = NULL,
1879         .sysfs_ops      = &veth_pool_ops,
1880         .default_attrs  = veth_pool_attrs,
1881 };
1882
1883 static int ibmveth_resume(struct device *dev)
1884 {
1885         struct net_device *netdev = dev_get_drvdata(dev);
1886         ibmveth_interrupt(netdev->irq, netdev);
1887         return 0;
1888 }
1889
1890 static const struct vio_device_id ibmveth_device_table[] = {
1891         { "network", "IBM,l-lan"},
1892         { "", "" }
1893 };
1894 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1895
1896 static const struct dev_pm_ops ibmveth_pm_ops = {
1897         .resume = ibmveth_resume
1898 };
1899
1900 static struct vio_driver ibmveth_driver = {
1901         .id_table       = ibmveth_device_table,
1902         .probe          = ibmveth_probe,
1903         .remove         = ibmveth_remove,
1904         .get_desired_dma = ibmveth_get_desired_dma,
1905         .name           = ibmveth_driver_name,
1906         .pm             = &ibmveth_pm_ops,
1907 };
1908
1909 static int __init ibmveth_module_init(void)
1910 {
1911         printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1912                ibmveth_driver_string, ibmveth_driver_version);
1913
1914         return vio_register_driver(&ibmveth_driver);
1915 }
1916
1917 static void __exit ibmveth_module_exit(void)
1918 {
1919         vio_unregister_driver(&ibmveth_driver);
1920 }
1921
1922 module_init(ibmveth_module_init);
1923 module_exit(ibmveth_module_exit);