linux/drivers/net/ethernet/ibm/ibmveth.c
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   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
  54static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
  55static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
  56static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
  57
  58static struct kobj_type ktype_veth_pool;
  59
  60
  61static const char ibmveth_driver_name[] = "ibmveth";
  62static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
  63#define ibmveth_driver_version "1.06"
  64
  65MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
  66MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
  67MODULE_LICENSE("GPL");
  68MODULE_VERSION(ibmveth_driver_version);
  69
  70static unsigned int tx_copybreak __read_mostly = 128;
  71module_param(tx_copybreak, uint, 0644);
  72MODULE_PARM_DESC(tx_copybreak,
  73        "Maximum size of packet that is copied to a new buffer on transmit");
  74
  75static unsigned int rx_copybreak __read_mostly = 128;
  76module_param(rx_copybreak, uint, 0644);
  77MODULE_PARM_DESC(rx_copybreak,
  78        "Maximum size of packet that is copied to a new buffer on receive");
  79
  80static unsigned int rx_flush __read_mostly = 0;
  81module_param(rx_flush, uint, 0644);
  82MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
  83
  84static bool old_large_send __read_mostly;
  85module_param(old_large_send, bool, S_IRUGO);
  86MODULE_PARM_DESC(old_large_send,
  87        "Use old large send method on firmware that supports the new method");
  88
  89struct 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
  97struct 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 */
 116static 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
 121static 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
 127static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
 128{
 129        return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
 130}
 131
 132static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
 133{
 134        return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
 135}
 136
 137static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
 138{
 139        return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
 140}
 141
 142static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
 143{
 144        return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
 145}
 146
 147static 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
 152static 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 */
 158static 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 */
 170static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 171{
 172        int i;
 173
 174        pool->free_map = kmalloc(sizeof(u16) * pool->size, 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
 207static 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 */
 218static 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
 290failure:
 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 */
 313static 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 */
 321static 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 */
 339static 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 */
 373static 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 */
 408static 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 */
 421static 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
 458out:
 459        return ret;
 460}
 461
 462static 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
 472static 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         */
 482retry:
 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
 499static 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
 510static 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
 643out_free_bounce_buffer:
 644        kfree(adapter->bounce_buffer);
 645out_free_irq:
 646        free_irq(netdev->irq, netdev);
 647out_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        }
 653out_unmap_filter_list:
 654        dma_unmap_single(dev, adapter->filter_list_dma, 4096,
 655                         DMA_BIDIRECTIONAL);
 656out_unmap_buffer_list:
 657        dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
 658                         DMA_BIDIRECTIONAL);
 659out_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);
 663out_free_filter_list:
 664        free_page((unsigned long)adapter->filter_list_addr);
 665out_free_buffer_list:
 666        free_page((unsigned long)adapter->buffer_list_addr);
 667out:
 668        napi_disable(&adapter->napi);
 669        return rc;
 670}
 671
 672static 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
 728static 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
 751static 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
 758static 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
 776static 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
 861static 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
 923static 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
 949static 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
 960static 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
 970static 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
 980static 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
 989static 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
 996static 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
1027static 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
1085retry_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
1169out:
1170        dev_consume_skb_any(skb);
1171        return NETDEV_TX_OK;
1172
1173map_failed_frags:
1174        last = i+1;
1175        for (i = 0; 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
1180map_failed:
1181        if (!firmware_has_feature(FW_FEATURE_CMO))
1182                netdev_err(netdev, "tx: unable to map xmit buffer\n");
1183        adapter->tx_map_failed++;
1184        if (skb_linearize(skb)) {
1185                netdev->stats.tx_dropped++;
1186                goto out;
1187        }
1188        force_bounce = 1;
1189        goto retry_bounce;
1190}
1191
1192static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1193{
1194        struct tcphdr *tcph;
1195        int offset = 0;
1196        int hdr_len;
1197
1198        /* only TCP packets will be aggregated */
1199        if (skb->protocol == htons(ETH_P_IP)) {
1200                struct iphdr *iph = (struct iphdr *)skb->data;
1201
1202                if (iph->protocol == IPPROTO_TCP) {
1203                        offset = iph->ihl * 4;
1204                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1205                } else {
1206                        return;
1207                }
1208        } else if (skb->protocol == htons(ETH_P_IPV6)) {
1209                struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1210
1211                if (iph6->nexthdr == IPPROTO_TCP) {
1212                        offset = sizeof(struct ipv6hdr);
1213                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1214                } else {
1215                        return;
1216                }
1217        } else {
1218                return;
1219        }
1220        /* if mss is not set through Large Packet bit/mss in rx buffer,
1221         * expect that the mss will be written to the tcp header checksum.
1222         */
1223        tcph = (struct tcphdr *)(skb->data + offset);
1224        if (lrg_pkt) {
1225                skb_shinfo(skb)->gso_size = mss;
1226        } else if (offset) {
1227                skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1228                tcph->check = 0;
1229        }
1230
1231        if (skb_shinfo(skb)->gso_size) {
1232                hdr_len = offset + tcph->doff * 4;
1233                skb_shinfo(skb)->gso_segs =
1234                                DIV_ROUND_UP(skb->len - hdr_len,
1235                                             skb_shinfo(skb)->gso_size);
1236        }
1237}
1238
1239static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1240                                   struct ibmveth_adapter *adapter)
1241{
1242        struct iphdr *iph = NULL;
1243        struct ipv6hdr *iph6 = NULL;
1244        __be16 skb_proto = 0;
1245        u16 iphlen = 0;
1246        u16 iph_proto = 0;
1247        u16 tcphdrlen = 0;
1248
1249        skb_proto = be16_to_cpu(skb->protocol);
1250
1251        if (skb_proto == ETH_P_IP) {
1252                iph = (struct iphdr *)skb->data;
1253
1254                /* If the IP checksum is not offloaded and if the packet
1255                 *  is large send, the checksum must be rebuilt.
1256                 */
1257                if (iph->check == 0xffff) {
1258                        iph->check = 0;
1259                        iph->check = ip_fast_csum((unsigned char *)iph,
1260                                                  iph->ihl);
1261                }
1262
1263                iphlen = iph->ihl * 4;
1264                iph_proto = iph->protocol;
1265        } else if (skb_proto == ETH_P_IPV6) {
1266                iph6 = (struct ipv6hdr *)skb->data;
1267                iphlen = sizeof(struct ipv6hdr);
1268                iph_proto = iph6->nexthdr;
1269        }
1270
1271        /* In OVS environment, when a flow is not cached, specifically for a
1272         * new TCP connection, the first packet information is passed up
1273         * the user space for finding a flow. During this process, OVS computes
1274         * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1275         *
1276         * Given that we zeroed out TCP checksum field in transmit path
1277         * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1278         * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1279         * in the packet. This leads to OVS dropping the packet and hence
1280         * TCP retransmissions are seen.
1281         *
1282         * So, re-compute TCP pseudo header checksum.
1283         */
1284        if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1285                struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1286
1287                tcphdrlen = skb->len - iphlen;
1288
1289                /* Recompute TCP pseudo header checksum */
1290                if (skb_proto == ETH_P_IP)
1291                        tcph->check = ~csum_tcpudp_magic(iph->saddr,
1292                                        iph->daddr, tcphdrlen, iph_proto, 0);
1293                else if (skb_proto == ETH_P_IPV6)
1294                        tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1295                                        &iph6->daddr, tcphdrlen, iph_proto, 0);
1296
1297                /* Setup SKB fields for checksum offload */
1298                skb_partial_csum_set(skb, iphlen,
1299                                     offsetof(struct tcphdr, check));
1300                skb_reset_network_header(skb);
1301        }
1302}
1303
1304static int ibmveth_poll(struct napi_struct *napi, int budget)
1305{
1306        struct ibmveth_adapter *adapter =
1307                        container_of(napi, struct ibmveth_adapter, napi);
1308        struct net_device *netdev = adapter->netdev;
1309        int frames_processed = 0;
1310        unsigned long lpar_rc;
1311        u16 mss = 0;
1312
1313restart_poll:
1314        while (frames_processed < budget) {
1315                if (!ibmveth_rxq_pending_buffer(adapter))
1316                        break;
1317
1318                smp_rmb();
1319                if (!ibmveth_rxq_buffer_valid(adapter)) {
1320                        wmb(); /* suggested by larson1 */
1321                        adapter->rx_invalid_buffer++;
1322                        netdev_dbg(netdev, "recycling invalid buffer\n");
1323                        ibmveth_rxq_recycle_buffer(adapter);
1324                } else {
1325                        struct sk_buff *skb, *new_skb;
1326                        int length = ibmveth_rxq_frame_length(adapter);
1327                        int offset = ibmveth_rxq_frame_offset(adapter);
1328                        int csum_good = ibmveth_rxq_csum_good(adapter);
1329                        int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1330
1331                        skb = ibmveth_rxq_get_buffer(adapter);
1332
1333                        /* if the large packet bit is set in the rx queue
1334                         * descriptor, the mss will be written by PHYP eight
1335                         * bytes from the start of the rx buffer, which is
1336                         * skb->data at this stage
1337                         */
1338                        if (lrg_pkt) {
1339                                __be64 *rxmss = (__be64 *)(skb->data + 8);
1340
1341                                mss = (u16)be64_to_cpu(*rxmss);
1342                        }
1343
1344                        new_skb = NULL;
1345                        if (length < rx_copybreak)
1346                                new_skb = netdev_alloc_skb(netdev, length);
1347
1348                        if (new_skb) {
1349                                skb_copy_to_linear_data(new_skb,
1350                                                        skb->data + offset,
1351                                                        length);
1352                                if (rx_flush)
1353                                        ibmveth_flush_buffer(skb->data,
1354                                                length + offset);
1355                                if (!ibmveth_rxq_recycle_buffer(adapter))
1356                                        kfree_skb(skb);
1357                                skb = new_skb;
1358                        } else {
1359                                ibmveth_rxq_harvest_buffer(adapter);
1360                                skb_reserve(skb, offset);
1361                        }
1362
1363                        skb_put(skb, length);
1364                        skb->protocol = eth_type_trans(skb, netdev);
1365
1366                        if (csum_good) {
1367                                skb->ip_summed = CHECKSUM_UNNECESSARY;
1368                                ibmveth_rx_csum_helper(skb, adapter);
1369                        }
1370
1371                        if (length > netdev->mtu + ETH_HLEN) {
1372                                ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1373                                adapter->rx_large_packets++;
1374                        }
1375
1376                        napi_gro_receive(napi, skb);    /* send it up */
1377
1378                        netdev->stats.rx_packets++;
1379                        netdev->stats.rx_bytes += length;
1380                        frames_processed++;
1381                }
1382        }
1383
1384        ibmveth_replenish_task(adapter);
1385
1386        if (frames_processed < budget) {
1387                napi_complete_done(napi, frames_processed);
1388
1389                /* We think we are done - reenable interrupts,
1390                 * then check once more to make sure we are done.
1391                 */
1392                lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1393                                       VIO_IRQ_ENABLE);
1394
1395                BUG_ON(lpar_rc != H_SUCCESS);
1396
1397                if (ibmveth_rxq_pending_buffer(adapter) &&
1398                    napi_reschedule(napi)) {
1399                        lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1400                                               VIO_IRQ_DISABLE);
1401                        goto restart_poll;
1402                }
1403        }
1404
1405        return frames_processed;
1406}
1407
1408static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1409{
1410        struct net_device *netdev = dev_instance;
1411        struct ibmveth_adapter *adapter = netdev_priv(netdev);
1412        unsigned long lpar_rc;
1413
1414        if (napi_schedule_prep(&adapter->napi)) {
1415                lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1416                                       VIO_IRQ_DISABLE);
1417                BUG_ON(lpar_rc != H_SUCCESS);
1418                __napi_schedule(&adapter->napi);
1419        }
1420        return IRQ_HANDLED;
1421}
1422
1423static void ibmveth_set_multicast_list(struct net_device *netdev)
1424{
1425        struct ibmveth_adapter *adapter = netdev_priv(netdev);
1426        unsigned long lpar_rc;
1427
1428        if ((netdev->flags & IFF_PROMISC) ||
1429            (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1430                lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1431                                           IbmVethMcastEnableRecv |
1432                                           IbmVethMcastDisableFiltering,
1433                                           0);
1434                if (lpar_rc != H_SUCCESS) {
1435                        netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1436                                   "entering promisc mode\n", lpar_rc);
1437                }
1438        } else {
1439                struct netdev_hw_addr *ha;
1440                /* clear the filter table & disable filtering */
1441                lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1442                                           IbmVethMcastEnableRecv |
1443                                           IbmVethMcastDisableFiltering |
1444                                           IbmVethMcastClearFilterTable,
1445                                           0);
1446                if (lpar_rc != H_SUCCESS) {
1447                        netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1448                                   "attempting to clear filter table\n",
1449                                   lpar_rc);
1450                }
1451                /* add the addresses to the filter table */
1452                netdev_for_each_mc_addr(ha, netdev) {
1453                        /* add the multicast address to the filter table */
1454                        u64 mcast_addr;
1455                        mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1456                        lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1457                                                   IbmVethMcastAddFilter,
1458                                                   mcast_addr);
1459                        if (lpar_rc != H_SUCCESS) {
1460                                netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1461                                           "when adding an entry to the filter "
1462                                           "table\n", lpar_rc);
1463                        }
1464                }
1465
1466                /* re-enable filtering */
1467                lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1468                                           IbmVethMcastEnableFiltering,
1469                                           0);
1470                if (lpar_rc != H_SUCCESS) {
1471                        netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1472                                   "enabling filtering\n", lpar_rc);
1473                }
1474        }
1475}
1476
1477static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1478{
1479        struct ibmveth_adapter *adapter = netdev_priv(dev);
1480        struct vio_dev *viodev = adapter->vdev;
1481        int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1482        int i, rc;
1483        int need_restart = 0;
1484
1485        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1486                if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1487                        break;
1488
1489        if (i == IBMVETH_NUM_BUFF_POOLS)
1490                return -EINVAL;
1491
1492        /* Deactivate all the buffer pools so that the next loop can activate
1493           only the buffer pools necessary to hold the new MTU */
1494        if (netif_running(adapter->netdev)) {
1495                need_restart = 1;
1496                adapter->pool_config = 1;
1497                ibmveth_close(adapter->netdev);
1498                adapter->pool_config = 0;
1499        }
1500
1501        /* Look for an active buffer pool that can hold the new MTU */
1502        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503                adapter->rx_buff_pool[i].active = 1;
1504
1505                if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1506                        dev->mtu = new_mtu;
1507                        vio_cmo_set_dev_desired(viodev,
1508                                                ibmveth_get_desired_dma
1509                                                (viodev));
1510                        if (need_restart) {
1511                                return ibmveth_open(adapter->netdev);
1512                        }
1513                        return 0;
1514                }
1515        }
1516
1517        if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1518                return rc;
1519
1520        return -EINVAL;
1521}
1522
1523#ifdef CONFIG_NET_POLL_CONTROLLER
1524static void ibmveth_poll_controller(struct net_device *dev)
1525{
1526        ibmveth_replenish_task(netdev_priv(dev));
1527        ibmveth_interrupt(dev->irq, dev);
1528}
1529#endif
1530
1531/**
1532 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1533 *
1534 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1535 *
1536 * Return value:
1537 *      Number of bytes of IO data the driver will need to perform well.
1538 */
1539static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1540{
1541        struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1542        struct ibmveth_adapter *adapter;
1543        struct iommu_table *tbl;
1544        unsigned long ret;
1545        int i;
1546        int rxqentries = 1;
1547
1548        tbl = get_iommu_table_base(&vdev->dev);
1549
1550        /* netdev inits at probe time along with the structures we need below*/
1551        if (netdev == NULL)
1552                return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1553
1554        adapter = netdev_priv(netdev);
1555
1556        ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1557        ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1558
1559        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1560                /* add the size of the active receive buffers */
1561                if (adapter->rx_buff_pool[i].active)
1562                        ret +=
1563                            adapter->rx_buff_pool[i].size *
1564                            IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1565                                             buff_size, tbl);
1566                rxqentries += adapter->rx_buff_pool[i].size;
1567        }
1568        /* add the size of the receive queue entries */
1569        ret += IOMMU_PAGE_ALIGN(
1570                rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1571
1572        return ret;
1573}
1574
1575static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1576{
1577        struct ibmveth_adapter *adapter = netdev_priv(dev);
1578        struct sockaddr *addr = p;
1579        u64 mac_address;
1580        int rc;
1581
1582        if (!is_valid_ether_addr(addr->sa_data))
1583                return -EADDRNOTAVAIL;
1584
1585        mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1586        rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1587        if (rc) {
1588                netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1589                return rc;
1590        }
1591
1592        ether_addr_copy(dev->dev_addr, addr->sa_data);
1593
1594        return 0;
1595}
1596
1597static const struct net_device_ops ibmveth_netdev_ops = {
1598        .ndo_open               = ibmveth_open,
1599        .ndo_stop               = ibmveth_close,
1600        .ndo_start_xmit         = ibmveth_start_xmit,
1601        .ndo_set_rx_mode        = ibmveth_set_multicast_list,
1602        .ndo_do_ioctl           = ibmveth_ioctl,
1603        .ndo_change_mtu         = ibmveth_change_mtu,
1604        .ndo_fix_features       = ibmveth_fix_features,
1605        .ndo_set_features       = ibmveth_set_features,
1606        .ndo_validate_addr      = eth_validate_addr,
1607        .ndo_set_mac_address    = ibmveth_set_mac_addr,
1608#ifdef CONFIG_NET_POLL_CONTROLLER
1609        .ndo_poll_controller    = ibmveth_poll_controller,
1610#endif
1611};
1612
1613static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1614{
1615        int rc, i, mac_len;
1616        struct net_device *netdev;
1617        struct ibmveth_adapter *adapter;
1618        unsigned char *mac_addr_p;
1619        unsigned int *mcastFilterSize_p;
1620        long ret;
1621        unsigned long ret_attr;
1622
1623        dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1624                dev->unit_address);
1625
1626        mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1627                                                        &mac_len);
1628        if (!mac_addr_p) {
1629                dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1630                return -EINVAL;
1631        }
1632        /* Workaround for old/broken pHyp */
1633        if (mac_len == 8)
1634                mac_addr_p += 2;
1635        else if (mac_len != 6) {
1636                dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1637                        mac_len);
1638                return -EINVAL;
1639        }
1640
1641        mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1642                                                VETH_MCAST_FILTER_SIZE, NULL);
1643        if (!mcastFilterSize_p) {
1644                dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1645                        "attribute\n");
1646                return -EINVAL;
1647        }
1648
1649        netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1650
1651        if (!netdev)
1652                return -ENOMEM;
1653
1654        adapter = netdev_priv(netdev);
1655        dev_set_drvdata(&dev->dev, netdev);
1656
1657        adapter->vdev = dev;
1658        adapter->netdev = netdev;
1659        adapter->mcastFilterSize = *mcastFilterSize_p;
1660        adapter->pool_config = 0;
1661
1662        netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1663
1664        netdev->irq = dev->irq;
1665        netdev->netdev_ops = &ibmveth_netdev_ops;
1666        netdev->ethtool_ops = &netdev_ethtool_ops;
1667        SET_NETDEV_DEV(netdev, &dev->dev);
1668        netdev->hw_features = NETIF_F_SG;
1669        if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1670                netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1671                                       NETIF_F_RXCSUM;
1672        }
1673
1674        netdev->features |= netdev->hw_features;
1675
1676        ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1677
1678        /* If running older firmware, TSO should not be enabled by default */
1679        if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1680            !old_large_send) {
1681                netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1682                netdev->features |= netdev->hw_features;
1683        } else {
1684                netdev->hw_features |= NETIF_F_TSO;
1685        }
1686
1687        adapter->is_active_trunk = false;
1688        if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1689                adapter->is_active_trunk = true;
1690                netdev->hw_features |= NETIF_F_FRAGLIST;
1691                netdev->features |= NETIF_F_FRAGLIST;
1692        }
1693
1694        netdev->min_mtu = IBMVETH_MIN_MTU;
1695        netdev->max_mtu = ETH_MAX_MTU;
1696
1697        memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1698
1699        if (firmware_has_feature(FW_FEATURE_CMO))
1700                memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1701
1702        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1703                struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1704                int error;
1705
1706                ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1707                                         pool_count[i], pool_size[i],
1708                                         pool_active[i]);
1709                error = kobject_init_and_add(kobj, &ktype_veth_pool,
1710                                             &dev->dev.kobj, "pool%d", i);
1711                if (!error)
1712                        kobject_uevent(kobj, KOBJ_ADD);
1713        }
1714
1715        netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1716        netdev_dbg(netdev, "registering netdev...\n");
1717
1718        ibmveth_set_features(netdev, netdev->features);
1719
1720        rc = register_netdev(netdev);
1721
1722        if (rc) {
1723                netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1724                free_netdev(netdev);
1725                return rc;
1726        }
1727
1728        netdev_dbg(netdev, "registered\n");
1729
1730        return 0;
1731}
1732
1733static int ibmveth_remove(struct vio_dev *dev)
1734{
1735        struct net_device *netdev = dev_get_drvdata(&dev->dev);
1736        struct ibmveth_adapter *adapter = netdev_priv(netdev);
1737        int i;
1738
1739        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1740                kobject_put(&adapter->rx_buff_pool[i].kobj);
1741
1742        unregister_netdev(netdev);
1743
1744        free_netdev(netdev);
1745        dev_set_drvdata(&dev->dev, NULL);
1746
1747        return 0;
1748}
1749
1750static struct attribute veth_active_attr;
1751static struct attribute veth_num_attr;
1752static struct attribute veth_size_attr;
1753
1754static ssize_t veth_pool_show(struct kobject *kobj,
1755                              struct attribute *attr, char *buf)
1756{
1757        struct ibmveth_buff_pool *pool = container_of(kobj,
1758                                                      struct ibmveth_buff_pool,
1759                                                      kobj);
1760
1761        if (attr == &veth_active_attr)
1762                return sprintf(buf, "%d\n", pool->active);
1763        else if (attr == &veth_num_attr)
1764                return sprintf(buf, "%d\n", pool->size);
1765        else if (attr == &veth_size_attr)
1766                return sprintf(buf, "%d\n", pool->buff_size);
1767        return 0;
1768}
1769
1770static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1771                               const char *buf, size_t count)
1772{
1773        struct ibmveth_buff_pool *pool = container_of(kobj,
1774                                                      struct ibmveth_buff_pool,
1775                                                      kobj);
1776        struct net_device *netdev = dev_get_drvdata(
1777            container_of(kobj->parent, struct device, kobj));
1778        struct ibmveth_adapter *adapter = netdev_priv(netdev);
1779        long value = simple_strtol(buf, NULL, 10);
1780        long rc;
1781
1782        if (attr == &veth_active_attr) {
1783                if (value && !pool->active) {
1784                        if (netif_running(netdev)) {
1785                                if (ibmveth_alloc_buffer_pool(pool)) {
1786                                        netdev_err(netdev,
1787                                                   "unable to alloc pool\n");
1788                                        return -ENOMEM;
1789                                }
1790                                pool->active = 1;
1791                                adapter->pool_config = 1;
1792                                ibmveth_close(netdev);
1793                                adapter->pool_config = 0;
1794                                if ((rc = ibmveth_open(netdev)))
1795                                        return rc;
1796                        } else {
1797                                pool->active = 1;
1798                        }
1799                } else if (!value && pool->active) {
1800                        int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1801                        int i;
1802                        /* Make sure there is a buffer pool with buffers that
1803                           can hold a packet of the size of the MTU */
1804                        for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1805                                if (pool == &adapter->rx_buff_pool[i])
1806                                        continue;
1807                                if (!adapter->rx_buff_pool[i].active)
1808                                        continue;
1809                                if (mtu <= adapter->rx_buff_pool[i].buff_size)
1810                                        break;
1811                        }
1812
1813                        if (i == IBMVETH_NUM_BUFF_POOLS) {
1814                                netdev_err(netdev, "no active pool >= MTU\n");
1815                                return -EPERM;
1816                        }
1817
1818                        if (netif_running(netdev)) {
1819                                adapter->pool_config = 1;
1820                                ibmveth_close(netdev);
1821                                pool->active = 0;
1822                                adapter->pool_config = 0;
1823                                if ((rc = ibmveth_open(netdev)))
1824                                        return rc;
1825                        }
1826                        pool->active = 0;
1827                }
1828        } else if (attr == &veth_num_attr) {
1829                if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1830                        return -EINVAL;
1831                } else {
1832                        if (netif_running(netdev)) {
1833                                adapter->pool_config = 1;
1834                                ibmveth_close(netdev);
1835                                adapter->pool_config = 0;
1836                                pool->size = value;
1837                                if ((rc = ibmveth_open(netdev)))
1838                                        return rc;
1839                        } else {
1840                                pool->size = value;
1841                        }
1842                }
1843        } else if (attr == &veth_size_attr) {
1844                if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1845                        return -EINVAL;
1846                } else {
1847                        if (netif_running(netdev)) {
1848                                adapter->pool_config = 1;
1849                                ibmveth_close(netdev);
1850                                adapter->pool_config = 0;
1851                                pool->buff_size = value;
1852                                if ((rc = ibmveth_open(netdev)))
1853                                        return rc;
1854                        } else {
1855                                pool->buff_size = value;
1856                        }
1857                }
1858        }
1859
1860        /* kick the interrupt handler to allocate/deallocate pools */
1861        ibmveth_interrupt(netdev->irq, netdev);
1862        return count;
1863}
1864
1865
1866#define ATTR(_name, _mode)                              \
1867        struct attribute veth_##_name##_attr = {        \
1868        .name = __stringify(_name), .mode = _mode,      \
1869        };
1870
1871static ATTR(active, 0644);
1872static ATTR(num, 0644);
1873static ATTR(size, 0644);
1874
1875static struct attribute *veth_pool_attrs[] = {
1876        &veth_active_attr,
1877        &veth_num_attr,
1878        &veth_size_attr,
1879        NULL,
1880};
1881
1882static const struct sysfs_ops veth_pool_ops = {
1883        .show   = veth_pool_show,
1884        .store  = veth_pool_store,
1885};
1886
1887static struct kobj_type ktype_veth_pool = {
1888        .release        = NULL,
1889        .sysfs_ops      = &veth_pool_ops,
1890        .default_attrs  = veth_pool_attrs,
1891};
1892
1893static int ibmveth_resume(struct device *dev)
1894{
1895        struct net_device *netdev = dev_get_drvdata(dev);
1896        ibmveth_interrupt(netdev->irq, netdev);
1897        return 0;
1898}
1899
1900static const struct vio_device_id ibmveth_device_table[] = {
1901        { "network", "IBM,l-lan"},
1902        { "", "" }
1903};
1904MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1905
1906static const struct dev_pm_ops ibmveth_pm_ops = {
1907        .resume = ibmveth_resume
1908};
1909
1910static struct vio_driver ibmveth_driver = {
1911        .id_table       = ibmveth_device_table,
1912        .probe          = ibmveth_probe,
1913        .remove         = ibmveth_remove,
1914        .get_desired_dma = ibmveth_get_desired_dma,
1915        .name           = ibmveth_driver_name,
1916        .pm             = &ibmveth_pm_ops,
1917};
1918
1919static int __init ibmveth_module_init(void)
1920{
1921        printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1922               ibmveth_driver_string, ibmveth_driver_version);
1923
1924        return vio_register_driver(&ibmveth_driver);
1925}
1926
1927static void __exit ibmveth_module_exit(void)
1928{
1929        vio_unregister_driver(&ibmveth_driver);
1930}
1931
1932module_init(ibmveth_module_init);
1933module_exit(ibmveth_module_exit);
1934