drivers/net/enic/enic_main.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/init.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/pci.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/in.h>
  34 #include <linux/ip.h>
  35 #include <linux/ipv6.h>
  36 #include <linux/tcp.h>
  37 #include <net/ip6_checksum.h>
  38
  39 #include "cq_enet_desc.h"
  40 #include "vnic_dev.h"
  41 #include "vnic_intr.h"
  42 #include "vnic_stats.h"
  43 #include "enic_res.h"
  44 #include "enic.h"
  45
  46 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  47
  48 /* Supported devices */
  49 static struct pci_device_id enic_id_table[] = {
  50         { PCI_VDEVICE(CISCO, 0x0043) },
  51         { 0, }  /* end of table */
  52 };
  53
  54 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  55 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  56 MODULE_LICENSE("GPL");
  57 MODULE_VERSION(DRV_VERSION);
  58 MODULE_DEVICE_TABLE(pci, enic_id_table);
  59
  60 struct enic_stat {
  61         char name[ETH_GSTRING_LEN];
  62         unsigned int offset;
  63 };
  64
  65 #define ENIC_TX_STAT(stat)      \
  66         { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
  67 #define ENIC_RX_STAT(stat)      \
  68         { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
  69
  70 static const struct enic_stat enic_tx_stats[] = {
  71         ENIC_TX_STAT(tx_frames_ok),
  72         ENIC_TX_STAT(tx_unicast_frames_ok),
  73         ENIC_TX_STAT(tx_multicast_frames_ok),
  74         ENIC_TX_STAT(tx_broadcast_frames_ok),
  75         ENIC_TX_STAT(tx_bytes_ok),
  76         ENIC_TX_STAT(tx_unicast_bytes_ok),
  77         ENIC_TX_STAT(tx_multicast_bytes_ok),
  78         ENIC_TX_STAT(tx_broadcast_bytes_ok),
  79         ENIC_TX_STAT(tx_drops),
  80         ENIC_TX_STAT(tx_errors),
  81         ENIC_TX_STAT(tx_tso),
  82 };
  83
  84 static const struct enic_stat enic_rx_stats[] = {
  85         ENIC_RX_STAT(rx_frames_ok),
  86         ENIC_RX_STAT(rx_frames_total),
  87         ENIC_RX_STAT(rx_unicast_frames_ok),
  88         ENIC_RX_STAT(rx_multicast_frames_ok),
  89         ENIC_RX_STAT(rx_broadcast_frames_ok),
  90         ENIC_RX_STAT(rx_bytes_ok),
  91         ENIC_RX_STAT(rx_unicast_bytes_ok),
  92         ENIC_RX_STAT(rx_multicast_bytes_ok),
  93         ENIC_RX_STAT(rx_broadcast_bytes_ok),
  94         ENIC_RX_STAT(rx_drop),
  95         ENIC_RX_STAT(rx_no_bufs),
  96         ENIC_RX_STAT(rx_errors),
  97         ENIC_RX_STAT(rx_rss),
  98         ENIC_RX_STAT(rx_crc_errors),
  99         ENIC_RX_STAT(rx_frames_64),
 100         ENIC_RX_STAT(rx_frames_127),
 101         ENIC_RX_STAT(rx_frames_255),
 102         ENIC_RX_STAT(rx_frames_511),
 103         ENIC_RX_STAT(rx_frames_1023),
 104         ENIC_RX_STAT(rx_frames_1518),
 105         ENIC_RX_STAT(rx_frames_to_max),
 106 };
 107
 108 static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
 109 static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
 110
 111 static int enic_get_settings(struct net_device *netdev,
 112         struct ethtool_cmd *ecmd)
 113 {
 114         struct enic *enic = netdev_priv(netdev);
 115
 116         ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
 117         ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
 118         ecmd->port = PORT_FIBRE;
 119         ecmd->transceiver = XCVR_EXTERNAL;
 120
 121         if (netif_carrier_ok(netdev)) {
 122                 ecmd->speed = vnic_dev_port_speed(enic->vdev);
 123                 ecmd->duplex = DUPLEX_FULL;
 124         } else {
 125                 ecmd->speed = -1;
 126                 ecmd->duplex = -1;
 127         }
 128
 129         ecmd->autoneg = AUTONEG_DISABLE;
 130
 131         return 0;
 132 }
 133
 134 static void enic_get_drvinfo(struct net_device *netdev,
 135         struct ethtool_drvinfo *drvinfo)
 136 {
 137         struct enic *enic = netdev_priv(netdev);
 138         struct vnic_devcmd_fw_info *fw_info;
 139
 140         spin_lock(&enic->devcmd_lock);
 141         vnic_dev_fw_info(enic->vdev, &fw_info);
 142         spin_unlock(&enic->devcmd_lock);
 143
 144         strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
 145         strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
 146         strncpy(drvinfo->fw_version, fw_info->fw_version,
 147                 sizeof(drvinfo->fw_version));
 148         strncpy(drvinfo->bus_info, pci_name(enic->pdev),
 149                 sizeof(drvinfo->bus_info));
 150 }
 151
 152 static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 153 {
 154         unsigned int i;
 155
 156         switch (stringset) {
 157         case ETH_SS_STATS:
 158                 for (i = 0; i < enic_n_tx_stats; i++) {
 159                         memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
 160                         data += ETH_GSTRING_LEN;
 161                 }
 162                 for (i = 0; i < enic_n_rx_stats; i++) {
 163                         memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
 164                         data += ETH_GSTRING_LEN;
 165                 }
 166                 break;
 167         }
 168 }
 169
 170 static int enic_get_sset_count(struct net_device *netdev, int sset)
 171 {
 172         switch (sset) {
 173         case ETH_SS_STATS:
 174                 return enic_n_tx_stats + enic_n_rx_stats;
 175         default:
 176                 return -EOPNOTSUPP;
 177         }
 178 }
 179
 180 static void enic_get_ethtool_stats(struct net_device *netdev,
 181         struct ethtool_stats *stats, u64 *data)
 182 {
 183         struct enic *enic = netdev_priv(netdev);
 184         struct vnic_stats *vstats;
 185         unsigned int i;
 186
 187         spin_lock(&enic->devcmd_lock);
 188         vnic_dev_stats_dump(enic->vdev, &vstats);
 189         spin_unlock(&enic->devcmd_lock);
 190
 191         for (i = 0; i < enic_n_tx_stats; i++)
 192                 *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
 193         for (i = 0; i < enic_n_rx_stats; i++)
 194                 *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
 195 }
 196
 197 static u32 enic_get_rx_csum(struct net_device *netdev)
 198 {
 199         struct enic *enic = netdev_priv(netdev);
 200         return enic->csum_rx_enabled;
 201 }
 202
 203 static int enic_set_rx_csum(struct net_device *netdev, u32 data)
 204 {
 205         struct enic *enic = netdev_priv(netdev);
 206
 207         if (data && !ENIC_SETTING(enic, RXCSUM))
 208                 return -EINVAL;
 209
 210         enic->csum_rx_enabled = !!data;
 211
 212         return 0;
 213 }
 214
 215 static int enic_set_tx_csum(struct net_device *netdev, u32 data)
 216 {
 217         struct enic *enic = netdev_priv(netdev);
 218
 219         if (data && !ENIC_SETTING(enic, TXCSUM))
 220                 return -EINVAL;
 221
 222         if (data)
 223                 netdev->features |= NETIF_F_HW_CSUM;
 224         else
 225                 netdev->features &= ~NETIF_F_HW_CSUM;
 226
 227         return 0;
 228 }
 229
 230 static int enic_set_tso(struct net_device *netdev, u32 data)
 231 {
 232         struct enic *enic = netdev_priv(netdev);
 233
 234         if (data && !ENIC_SETTING(enic, TSO))
 235                 return -EINVAL;
 236
 237         if (data)
 238                 netdev->features |=
 239                         NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN;
 240         else
 241                 netdev->features &=
 242                         ~(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN);
 243
 244         return 0;
 245 }
 246
 247 static u32 enic_get_msglevel(struct net_device *netdev)
 248 {
 249         struct enic *enic = netdev_priv(netdev);
 250         return enic->msg_enable;
 251 }
 252
 253 static void enic_set_msglevel(struct net_device *netdev, u32 value)
 254 {
 255         struct enic *enic = netdev_priv(netdev);
 256         enic->msg_enable = value;
 257 }
 258
 259 static struct ethtool_ops enic_ethtool_ops = {
 260         .get_settings = enic_get_settings,
 261         .get_drvinfo = enic_get_drvinfo,
 262         .get_msglevel = enic_get_msglevel,
 263         .set_msglevel = enic_set_msglevel,
 264         .get_link = ethtool_op_get_link,
 265         .get_strings = enic_get_strings,
 266         .get_sset_count = enic_get_sset_count,
 267         .get_ethtool_stats = enic_get_ethtool_stats,
 268         .get_rx_csum = enic_get_rx_csum,
 269         .set_rx_csum = enic_set_rx_csum,
 270         .get_tx_csum = ethtool_op_get_tx_csum,
 271         .set_tx_csum = enic_set_tx_csum,
 272         .get_sg = ethtool_op_get_sg,
 273         .set_sg = ethtool_op_set_sg,
 274         .get_tso = ethtool_op_get_tso,
 275         .set_tso = enic_set_tso,
 276         .get_flags = ethtool_op_get_flags,
 277         .set_flags = ethtool_op_set_flags,
 278 };
 279
 280 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 281 {
 282         struct enic *enic = vnic_dev_priv(wq->vdev);
 283
 284         if (buf->sop)
 285                 pci_unmap_single(enic->pdev, buf->dma_addr,
 286                         buf->len, PCI_DMA_TODEVICE);
 287         else
 288                 pci_unmap_page(enic->pdev, buf->dma_addr,
 289                         buf->len, PCI_DMA_TODEVICE);
 290
 291         if (buf->os_buf)
 292                 dev_kfree_skb_any(buf->os_buf);
 293 }
 294
 295 static void enic_wq_free_buf(struct vnic_wq *wq,
 296         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 297 {
 298         enic_free_wq_buf(wq, buf);
 299 }
 300
 301 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 302         u8 type, u16 q_number, u16 completed_index, void *opaque)
 303 {
 304         struct enic *enic = vnic_dev_priv(vdev);
 305
 306         spin_lock(&enic->wq_lock[q_number]);
 307
 308         vnic_wq_service(&enic->wq[q_number], cq_desc,
 309                 completed_index, enic_wq_free_buf,
 310                 opaque);
 311
 312         if (netif_queue_stopped(enic->netdev) &&
 313             vnic_wq_desc_avail(&enic->wq[q_number]) >= MAX_SKB_FRAGS + 1)
 314                 netif_wake_queue(enic->netdev);
 315
 316         spin_unlock(&enic->wq_lock[q_number]);
 317
 318         return 0;
 319 }
 320
 321 static void enic_log_q_error(struct enic *enic)
 322 {
 323         unsigned int i;
 324         u32 error_status;
 325
 326         for (i = 0; i < enic->wq_count; i++) {
 327                 error_status = vnic_wq_error_status(&enic->wq[i]);
 328                 if (error_status)
 329                         printk(KERN_ERR PFX "%s: WQ[%d] error_status %d\n",
 330                                 enic->netdev->name, i, error_status);
 331         }
 332
 333         for (i = 0; i < enic->rq_count; i++) {
 334                 error_status = vnic_rq_error_status(&enic->rq[i]);
 335                 if (error_status)
 336                         printk(KERN_ERR PFX "%s: RQ[%d] error_status %d\n",
 337                                 enic->netdev->name, i, error_status);
 338         }
 339 }
 340
 341 static void enic_link_check(struct enic *enic)
 342 {
 343         int link_status = vnic_dev_link_status(enic->vdev);
 344         int carrier_ok = netif_carrier_ok(enic->netdev);
 345
 346         if (link_status && !carrier_ok) {
 347                 printk(KERN_INFO PFX "%s: Link UP\n", enic->netdev->name);
 348                 netif_carrier_on(enic->netdev);
 349         } else if (!link_status && carrier_ok) {
 350                 printk(KERN_INFO PFX "%s: Link DOWN\n", enic->netdev->name);
 351                 netif_carrier_off(enic->netdev);
 352         }
 353 }
 354
 355 static void enic_mtu_check(struct enic *enic)
 356 {
 357         u32 mtu = vnic_dev_mtu(enic->vdev);
 358
 359         if (mtu != enic->port_mtu) {
 360                 if (mtu < enic->netdev->mtu)
 361                         printk(KERN_WARNING PFX
 362                                 "%s: interface MTU (%d) set higher "
 363                                 "than switch port MTU (%d)\n",
 364                                 enic->netdev->name, enic->netdev->mtu, mtu);
 365                 enic->port_mtu = mtu;
 366         }
 367 }
 368
 369 static void enic_msglvl_check(struct enic *enic)
 370 {
 371         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 372
 373         if (msg_enable != enic->msg_enable) {
 374                 printk(KERN_INFO PFX "%s: msg lvl changed from 0x%x to 0x%x\n",
 375                         enic->netdev->name, enic->msg_enable, msg_enable);
 376                 enic->msg_enable = msg_enable;
 377         }
 378 }
 379
 380 static void enic_notify_check(struct enic *enic)
 381 {
 382         enic_msglvl_check(enic);
 383         enic_mtu_check(enic);
 384         enic_link_check(enic);
 385 }
 386
 387 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 388
 389 static irqreturn_t enic_isr_legacy(int irq, void *data)
 390 {
 391         struct net_device *netdev = data;
 392         struct enic *enic = netdev_priv(netdev);
 393         u32 pba;
 394
 395         vnic_intr_mask(&enic->intr[ENIC_INTX_WQ_RQ]);
 396
 397         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 398         if (!pba) {
 399                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
 400                 return IRQ_NONE;        /* not our interrupt */
 401         }
 402
 403         if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY)) {
 404                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_NOTIFY]);
 405                 enic_notify_check(enic);
 406         }
 407
 408         if (ENIC_TEST_INTR(pba, ENIC_INTX_ERR)) {
 409                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_ERR]);
 410                 enic_log_q_error(enic);
 411                 /* schedule recovery from WQ/RQ error */
 412                 schedule_work(&enic->reset);
 413                 return IRQ_HANDLED;
 414         }
 415
 416         if (ENIC_TEST_INTR(pba, ENIC_INTX_WQ_RQ)) {
 417                 if (napi_schedule_prep(&enic->napi))
 418                         __napi_schedule(&enic->napi);
 419         } else {
 420                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
 421         }
 422
 423         return IRQ_HANDLED;
 424 }
 425
 426 static irqreturn_t enic_isr_msi(int irq, void *data)
 427 {
 428         struct enic *enic = data;
 429
 430         /* With MSI, there is no sharing of interrupts, so this is
 431          * our interrupt and there is no need to ack it.  The device
 432          * is not providing per-vector masking, so the OS will not
 433          * write to PCI config space to mask/unmask the interrupt.
 434          * We're using mask_on_assertion for MSI, so the device
 435          * automatically masks the interrupt when the interrupt is
 436          * generated.  Later, when exiting polling, the interrupt
 437          * will be unmasked (see enic_poll).
 438          *
 439          * Also, the device uses the same PCIe Traffic Class (TC)
 440          * for Memory Write data and MSI, so there are no ordering
 441          * issues; the MSI will always arrive at the Root Complex
 442          * _after_ corresponding Memory Writes (i.e. descriptor
 443          * writes).
 444          */
 445
 446         napi_schedule(&enic->napi);
 447
 448         return IRQ_HANDLED;
 449 }
 450
 451 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
 452 {
 453         struct enic *enic = data;
 454
 455         /* schedule NAPI polling for RQ cleanup */
 456         napi_schedule(&enic->napi);
 457
 458         return IRQ_HANDLED;
 459 }
 460
 461 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
 462 {
 463         struct enic *enic = data;
 464         unsigned int wq_work_to_do = -1; /* no limit */
 465         unsigned int wq_work_done;
 466
 467         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
 468                 wq_work_to_do, enic_wq_service, NULL);
 469
 470         vnic_intr_return_credits(&enic->intr[ENIC_MSIX_WQ],
 471                 wq_work_done,
 472                 1 /* unmask intr */,
 473                 1 /* reset intr timer */);
 474
 475         return IRQ_HANDLED;
 476 }
 477
 478 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 479 {
 480         struct enic *enic = data;
 481
 482         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_ERR]);
 483
 484         enic_log_q_error(enic);
 485
 486         /* schedule recovery from WQ/RQ error */
 487         schedule_work(&enic->reset);
 488
 489         return IRQ_HANDLED;
 490 }
 491
 492 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 493 {
 494         struct enic *enic = data;
 495
 496         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_NOTIFY]);
 497         enic_notify_check(enic);
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 static inline void enic_queue_wq_skb_cont(struct enic *enic,
 503         struct vnic_wq *wq, struct sk_buff *skb,
 504         unsigned int len_left)
 505 {
 506         skb_frag_t *frag;
 507
 508         /* Queue additional data fragments */
 509         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 510                 len_left -= frag->size;
 511                 enic_queue_wq_desc_cont(wq, skb,
 512                         pci_map_page(enic->pdev, frag->page,
 513                                 frag->page_offset, frag->size,
 514                                 PCI_DMA_TODEVICE),
 515                         frag->size,
 516                         (len_left == 0));       /* EOP? */
 517         }
 518 }
 519
 520 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
 521         struct vnic_wq *wq, struct sk_buff *skb,
 522         int vlan_tag_insert, unsigned int vlan_tag)
 523 {
 524         unsigned int head_len = skb_headlen(skb);
 525         unsigned int len_left = skb->len - head_len;
 526         int eop = (len_left == 0);
 527
 528         /* Queue the main skb fragment */
 529         enic_queue_wq_desc(wq, skb,
 530                 pci_map_single(enic->pdev, skb->data,
 531                         head_len, PCI_DMA_TODEVICE),
 532                 head_len,
 533                 vlan_tag_insert, vlan_tag,
 534                 eop);
 535
 536         if (!eop)
 537                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
 538 }
 539
 540 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
 541         struct vnic_wq *wq, struct sk_buff *skb,
 542         int vlan_tag_insert, unsigned int vlan_tag)
 543 {
 544         unsigned int head_len = skb_headlen(skb);
 545         unsigned int len_left = skb->len - head_len;
 546         unsigned int hdr_len = skb_transport_offset(skb);
 547         unsigned int csum_offset = hdr_len + skb->csum_offset;
 548         int eop = (len_left == 0);
 549
 550         /* Queue the main skb fragment */
 551         enic_queue_wq_desc_csum_l4(wq, skb,
 552                 pci_map_single(enic->pdev, skb->data,
 553                         head_len, PCI_DMA_TODEVICE),
 554                 head_len,
 555                 csum_offset,
 556                 hdr_len,
 557                 vlan_tag_insert, vlan_tag,
 558                 eop);
 559
 560         if (!eop)
 561                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
 562 }
 563
 564 static inline void enic_queue_wq_skb_tso(struct enic *enic,
 565         struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
 566         int vlan_tag_insert, unsigned int vlan_tag)
 567 {
 568         unsigned int head_len = skb_headlen(skb);
 569         unsigned int len_left = skb->len - head_len;
 570         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 571         int eop = (len_left == 0);
 572
 573         /* Preload TCP csum field with IP pseudo hdr calculated
 574          * with IP length set to zero.  HW will later add in length
 575          * to each TCP segment resulting from the TSO.
 576          */
 577
 578         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 579                 ip_hdr(skb)->check = 0;
 580                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 581                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 582         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 583                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 584                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 585         }
 586
 587         /* Queue the main skb fragment */
 588         enic_queue_wq_desc_tso(wq, skb,
 589                 pci_map_single(enic->pdev, skb->data,
 590                         head_len, PCI_DMA_TODEVICE),
 591                 head_len,
 592                 mss, hdr_len,
 593                 vlan_tag_insert, vlan_tag,
 594                 eop);
 595
 596         if (!eop)
 597                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
 598 }
 599
 600 static inline void enic_queue_wq_skb(struct enic *enic,
 601         struct vnic_wq *wq, struct sk_buff *skb)
 602 {
 603         unsigned int mss = skb_shinfo(skb)->gso_size;
 604         unsigned int vlan_tag = 0;
 605         int vlan_tag_insert = 0;
 606
 607         if (enic->vlan_group && vlan_tx_tag_present(skb)) {
 608                 /* VLAN tag from trunking driver */
 609                 vlan_tag_insert = 1;
 610                 vlan_tag = vlan_tx_tag_get(skb);
 611         }
 612
 613         if (mss)
 614                 enic_queue_wq_skb_tso(enic, wq, skb, mss,
 615                         vlan_tag_insert, vlan_tag);
 616         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 617                 enic_queue_wq_skb_csum_l4(enic, wq, skb,
 618                         vlan_tag_insert, vlan_tag);
 619         else
 620                 enic_queue_wq_skb_vlan(enic, wq, skb,
 621                         vlan_tag_insert, vlan_tag);
 622 }
 623
 624 /* netif_tx_lock held, process context with BHs disabled, or BH */
 625 static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 626 {
 627         struct enic *enic = netdev_priv(netdev);
 628         struct vnic_wq *wq = &enic->wq[0];
 629         unsigned long flags;
 630
 631         if (skb->len <= 0) {
 632                 dev_kfree_skb(skb);
 633                 return NETDEV_TX_OK;
 634         }
 635
 636         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 637          * which is very likely.  In the off chance it's going to take
 638          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 639          */
 640
 641         if (skb_shinfo(skb)->gso_size == 0 &&
 642             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 643             skb_linearize(skb)) {
 644                 dev_kfree_skb(skb);
 645                 return NETDEV_TX_OK;
 646         }
 647
 648         spin_lock_irqsave(&enic->wq_lock[0], flags);
 649
 650         if (vnic_wq_desc_avail(wq) < skb_shinfo(skb)->nr_frags + 1) {
 651                 netif_stop_queue(netdev);
 652                 /* This is a hard error, log it */
 653                 printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
 654                         "queue awake!\n", netdev->name);
 655                 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
 656                 return NETDEV_TX_BUSY;
 657         }
 658
 659         enic_queue_wq_skb(enic, wq, skb);
 660
 661         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + 1)
 662                 netif_stop_queue(netdev);
 663
 664         spin_unlock_irqrestore(&enic->wq_lock[0], flags);
 665
 666         return NETDEV_TX_OK;
 667 }
 668
 669 /* dev_base_lock rwlock held, nominally process context */
 670 static struct net_device_stats *enic_get_stats(struct net_device *netdev)
 671 {
 672         struct enic *enic = netdev_priv(netdev);
 673         struct net_device_stats *net_stats = &netdev->stats;
 674         struct vnic_stats *stats;
 675
 676         spin_lock(&enic->devcmd_lock);
 677         vnic_dev_stats_dump(enic->vdev, &stats);
 678         spin_unlock(&enic->devcmd_lock);
 679
 680         net_stats->tx_packets = stats->tx.tx_frames_ok;
 681         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 682         net_stats->tx_errors = stats->tx.tx_errors;
 683         net_stats->tx_dropped = stats->tx.tx_drops;
 684
 685         net_stats->rx_packets = stats->rx.rx_frames_ok;
 686         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 687         net_stats->rx_errors = stats->rx.rx_errors;
 688         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 689         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 690         net_stats->rx_dropped = stats->rx.rx_no_bufs;
 691
 692         return net_stats;
 693 }
 694
 695 static void enic_reset_mcaddrs(struct enic *enic)
 696 {
 697         enic->mc_count = 0;
 698 }
 699
 700 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 701 {
 702         if (!is_valid_ether_addr(addr))
 703                 return -EADDRNOTAVAIL;
 704
 705         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 706
 707         return 0;
 708 }
 709
 710 /* netif_tx_lock held, BHs disabled */
 711 static void enic_set_multicast_list(struct net_device *netdev)
 712 {
 713         struct enic *enic = netdev_priv(netdev);
 714         struct dev_mc_list *list = netdev->mc_list;
 715         int directed = 1;
 716         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 717         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 718         int promisc = (netdev->flags & IFF_PROMISC) ? 1 : 0;
 719         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 720             (netdev->mc_count > ENIC_MULTICAST_PERFECT_FILTERS);
 721         u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
 722         unsigned int mc_count = netdev->mc_count;
 723         unsigned int i, j;
 724
 725         if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS)
 726                 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
 727
 728         spin_lock(&enic->devcmd_lock);
 729
 730         vnic_dev_packet_filter(enic->vdev, directed,
 731                 multicast, broadcast, promisc, allmulti);
 732
 733         /* Is there an easier way?  Trying to minimize to
 734          * calls to add/del multicast addrs.  We keep the
 735          * addrs from the last call in enic->mc_addr and
 736          * look for changes to add/del.
 737          */
 738
 739         for (i = 0; list && i < mc_count; i++) {
 740                 memcpy(mc_addr[i], list->dmi_addr, ETH_ALEN);
 741                 list = list->next;
 742         }
 743
 744         for (i = 0; i < enic->mc_count; i++) {
 745                 for (j = 0; j < mc_count; j++)
 746                         if (compare_ether_addr(enic->mc_addr[i],
 747                                 mc_addr[j]) == 0)
 748                                 break;
 749                 if (j == mc_count)
 750                         enic_del_multicast_addr(enic, enic->mc_addr[i]);
 751         }
 752
 753         for (i = 0; i < mc_count; i++) {
 754                 for (j = 0; j < enic->mc_count; j++)
 755                         if (compare_ether_addr(mc_addr[i],
 756                                 enic->mc_addr[j]) == 0)
 757                                 break;
 758                 if (j == enic->mc_count)
 759                         enic_add_multicast_addr(enic, mc_addr[i]);
 760         }
 761
 762         /* Save the list to compare against next time
 763          */
 764
 765         for (i = 0; i < mc_count; i++)
 766                 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
 767
 768         enic->mc_count = mc_count;
 769
 770         spin_unlock(&enic->devcmd_lock);
 771 }
 772
 773 /* rtnl lock is held */
 774 static void enic_vlan_rx_register(struct net_device *netdev,
 775         struct vlan_group *vlan_group)
 776 {
 777         struct enic *enic = netdev_priv(netdev);
 778         enic->vlan_group = vlan_group;
 779 }
 780
 781 /* rtnl lock is held */
 782 static void enic_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
 783 {
 784         struct enic *enic = netdev_priv(netdev);
 785
 786         spin_lock(&enic->devcmd_lock);
 787         enic_add_vlan(enic, vid);
 788         spin_unlock(&enic->devcmd_lock);
 789 }
 790
 791 /* rtnl lock is held */
 792 static void enic_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
 793 {
 794         struct enic *enic = netdev_priv(netdev);
 795
 796         spin_lock(&enic->devcmd_lock);
 797         enic_del_vlan(enic, vid);
 798         spin_unlock(&enic->devcmd_lock);
 799 }
 800
 801 /* netif_tx_lock held, BHs disabled */
 802 static void enic_tx_timeout(struct net_device *netdev)
 803 {
 804         struct enic *enic = netdev_priv(netdev);
 805         schedule_work(&enic->reset);
 806 }
 807
 808 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 809 {
 810         struct enic *enic = vnic_dev_priv(rq->vdev);
 811
 812         if (!buf->os_buf)
 813                 return;
 814
 815         pci_unmap_single(enic->pdev, buf->dma_addr,
 816                 buf->len, PCI_DMA_FROMDEVICE);
 817         dev_kfree_skb_any(buf->os_buf);
 818 }
 819
 820 static inline struct sk_buff *enic_rq_alloc_skb(unsigned int size)
 821 {
 822         struct sk_buff *skb;
 823
 824         skb = dev_alloc_skb(size + NET_IP_ALIGN);
 825
 826         if (skb)
 827                 skb_reserve(skb, NET_IP_ALIGN);
 828
 829         return skb;
 830 }
 831
 832 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 833 {
 834         struct enic *enic = vnic_dev_priv(rq->vdev);
 835         struct sk_buff *skb;
 836         unsigned int len = enic->netdev->mtu + ETH_HLEN;
 837         unsigned int os_buf_index = 0;
 838         dma_addr_t dma_addr;
 839
 840         skb = enic_rq_alloc_skb(len);
 841         if (!skb)
 842                 return -ENOMEM;
 843
 844         dma_addr = pci_map_single(enic->pdev, skb->data,
 845                 len, PCI_DMA_FROMDEVICE);
 846
 847         enic_queue_rq_desc(rq, skb, os_buf_index,
 848                 dma_addr, len);
 849
 850         return 0;
 851 }
 852
 853 static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
 854         void **tcph, u64 *hdr_flags, void *priv)
 855 {
 856         struct cq_enet_rq_desc *cq_desc = priv;
 857         unsigned int ip_len;
 858         struct iphdr *iph;
 859
 860         u8 type, color, eop, sop, ingress_port, vlan_stripped;
 861         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
 862         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
 863         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
 864         u8 packet_error;
 865         u16 q_number, completed_index, bytes_written, vlan, checksum;
 866         u32 rss_hash;
 867
 868         cq_enet_rq_desc_dec(cq_desc,
 869                 &type, &color, &q_number, &completed_index,
 870                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
 871                 &csum_not_calc, &rss_hash, &bytes_written,
 872                 &packet_error, &vlan_stripped, &vlan, &checksum,
 873                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
 874                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
 875                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
 876                 &fcs_ok);
 877
 878         if (!(ipv4 && tcp && !ipv4_fragment))
 879                 return -1;
 880
 881         skb_reset_network_header(skb);
 882         iph = ip_hdr(skb);
 883
 884         ip_len = ip_hdrlen(skb);
 885         skb_set_transport_header(skb, ip_len);
 886
 887         /* check if ip header and tcp header are complete */
 888         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
 889                 return -1;
 890
 891         *hdr_flags = LRO_IPV4 | LRO_TCP;
 892         *tcph = tcp_hdr(skb);
 893         *iphdr = iph;
 894
 895         return 0;
 896 }
 897
 898 static void enic_rq_indicate_buf(struct vnic_rq *rq,
 899         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
 900         int skipped, void *opaque)
 901 {
 902         struct enic *enic = vnic_dev_priv(rq->vdev);
 903         struct net_device *netdev = enic->netdev;
 904         struct sk_buff *skb;
 905
 906         u8 type, color, eop, sop, ingress_port, vlan_stripped;
 907         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
 908         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
 909         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
 910         u8 packet_error;
 911         u16 q_number, completed_index, bytes_written, vlan, checksum;
 912         u32 rss_hash;
 913
 914         if (skipped)
 915                 return;
 916
 917         skb = buf->os_buf;
 918         prefetch(skb->data - NET_IP_ALIGN);
 919         pci_unmap_single(enic->pdev, buf->dma_addr,
 920                 buf->len, PCI_DMA_FROMDEVICE);
 921
 922         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
 923                 &type, &color, &q_number, &completed_index,
 924                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
 925                 &csum_not_calc, &rss_hash, &bytes_written,
 926                 &packet_error, &vlan_stripped, &vlan, &checksum,
 927                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
 928                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
 929                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
 930                 &fcs_ok);
 931
 932         if (packet_error) {
 933
 934                 if (bytes_written > 0 && !fcs_ok)
 935                         enic->rq_bad_fcs++;
 936
 937                 dev_kfree_skb_any(skb);
 938
 939                 return;
 940         }
 941
 942         if (eop && bytes_written > 0) {
 943
 944                 /* Good receive
 945                  */
 946
 947                 skb_put(skb, bytes_written);
 948                 skb->protocol = eth_type_trans(skb, netdev);
 949
 950                 if (enic->csum_rx_enabled && !csum_not_calc) {
 951                         skb->csum = htons(checksum);
 952                         skb->ip_summed = CHECKSUM_COMPLETE;
 953                 }
 954
 955                 skb->dev = netdev;
 956
 957                 if (enic->vlan_group && vlan_stripped) {
 958
 959                         if ((netdev->features & NETIF_F_LRO) && ipv4)
 960                                 lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
 961                                         skb, enic->vlan_group,
 962                                         vlan, cq_desc);
 963                         else
 964                                 vlan_hwaccel_receive_skb(skb,
 965                                         enic->vlan_group, vlan);
 966
 967                 } else {
 968
 969                         if ((netdev->features & NETIF_F_LRO) && ipv4)
 970                                 lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
 971                         else
 972                                 netif_receive_skb(skb);
 973
 974                 }
 975
 976         } else {
 977
 978                 /* Buffer overflow
 979                  */
 980
 981                 dev_kfree_skb_any(skb);
 982         }
 983 }
 984
 985 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 986         u8 type, u16 q_number, u16 completed_index, void *opaque)
 987 {
 988         struct enic *enic = vnic_dev_priv(vdev);
 989
 990         vnic_rq_service(&enic->rq[q_number], cq_desc,
 991                 completed_index, VNIC_RQ_RETURN_DESC,
 992                 enic_rq_indicate_buf, opaque);
 993
 994         return 0;
 995 }
 996
 997 static void enic_rq_drop_buf(struct vnic_rq *rq,
 998         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
 999         int skipped, void *opaque)
1000 {
1001         struct enic *enic = vnic_dev_priv(rq->vdev);
1002         struct sk_buff *skb = buf->os_buf;
1003
1004         if (skipped)
1005                 return;
1006
1007         pci_unmap_single(enic->pdev, buf->dma_addr,
1008                 buf->len, PCI_DMA_FROMDEVICE);
1009
1010         dev_kfree_skb_any(skb);
1011 }
1012
1013 static int enic_rq_service_drop(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1014         u8 type, u16 q_number, u16 completed_index, void *opaque)
1015 {
1016         struct enic *enic = vnic_dev_priv(vdev);
1017
1018         vnic_rq_service(&enic->rq[q_number], cq_desc,
1019                 completed_index, VNIC_RQ_RETURN_DESC,
1020                 enic_rq_drop_buf, opaque);
1021
1022         return 0;
1023 }
1024
1025 static int enic_poll(struct napi_struct *napi, int budget)
1026 {
1027         struct enic *enic = container_of(napi, struct enic, napi);
1028         struct net_device *netdev = enic->netdev;
1029         unsigned int rq_work_to_do = budget;
1030         unsigned int wq_work_to_do = -1; /* no limit */
1031         unsigned int  work_done, rq_work_done, wq_work_done;
1032
1033         /* Service RQ (first) and WQ
1034          */
1035
1036         rq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1037                 rq_work_to_do, enic_rq_service, NULL);
1038
1039         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
1040                 wq_work_to_do, enic_wq_service, NULL);
1041
1042         /* Accumulate intr event credits for this polling
1043          * cycle.  An intr event is the completion of a
1044          * a WQ or RQ packet.
1045          */
1046
1047         work_done = rq_work_done + wq_work_done;
1048
1049         if (work_done > 0)
1050                 vnic_intr_return_credits(&enic->intr[ENIC_INTX_WQ_RQ],
1051                         work_done,
1052                         0 /* don't unmask intr */,
1053                         0 /* don't reset intr timer */);
1054
1055         if (rq_work_done > 0) {
1056
1057                 /* Replenish RQ
1058                  */
1059
1060                 vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1061
1062         } else {
1063
1064                 /* If no work done, flush all LROs and exit polling
1065                  */
1066
1067                 if (netdev->features & NETIF_F_LRO)
1068                         lro_flush_all(&enic->lro_mgr);
1069
1070                 napi_complete(napi);
1071                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
1072         }
1073
1074         return rq_work_done;
1075 }
1076
1077 static int enic_poll_msix(struct napi_struct *napi, int budget)
1078 {
1079         struct enic *enic = container_of(napi, struct enic, napi);
1080         struct net_device *netdev = enic->netdev;
1081         unsigned int work_to_do = budget;
1082         unsigned int work_done;
1083
1084         /* Service RQ
1085          */
1086
1087         work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1088                 work_to_do, enic_rq_service, NULL);
1089
1090         if (work_done > 0) {
1091
1092                 /* Replenish RQ
1093                  */
1094
1095                 vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1096
1097                 /* Return intr event credits for this polling
1098                  * cycle.  An intr event is the completion of a
1099                  * RQ packet.
1100                  */
1101
1102                 vnic_intr_return_credits(&enic->intr[ENIC_MSIX_RQ],
1103                         work_done,
1104                         0 /* don't unmask intr */,
1105                         0 /* don't reset intr timer */);
1106         } else {
1107
1108                 /* If no work done, flush all LROs and exit polling
1109                  */
1110
1111                 if (netdev->features & NETIF_F_LRO)
1112                         lro_flush_all(&enic->lro_mgr);
1113
1114                 napi_complete(napi);
1115                 vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
1116         }
1117
1118         return work_done;
1119 }
1120
1121 static void enic_notify_timer(unsigned long data)
1122 {
1123         struct enic *enic = (struct enic *)data;
1124
1125         enic_notify_check(enic);
1126
1127         mod_timer(&enic->notify_timer,
1128                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1129 }
1130
1131 static void enic_free_intr(struct enic *enic)
1132 {
1133         struct net_device *netdev = enic->netdev;
1134         unsigned int i;
1135
1136         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1137         case VNIC_DEV_INTR_MODE_INTX:
1138                 free_irq(enic->pdev->irq, netdev);
1139                 break;
1140         case VNIC_DEV_INTR_MODE_MSI:
1141                 free_irq(enic->pdev->irq, enic);
1142                 break;
1143         case VNIC_DEV_INTR_MODE_MSIX:
1144                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1145                         if (enic->msix[i].requested)
1146                                 free_irq(enic->msix_entry[i].vector,
1147                                         enic->msix[i].devid);
1148                 break;
1149         default:
1150                 break;
1151         }
1152 }
1153
1154 static int enic_request_intr(struct enic *enic)
1155 {
1156         struct net_device *netdev = enic->netdev;
1157         unsigned int i;
1158         int err = 0;
1159
1160         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1161
1162         case VNIC_DEV_INTR_MODE_INTX:
1163
1164                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1165                         IRQF_SHARED, netdev->name, netdev);
1166                 break;
1167
1168         case VNIC_DEV_INTR_MODE_MSI:
1169
1170                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1171                         0, netdev->name, enic);
1172                 break;
1173
1174         case VNIC_DEV_INTR_MODE_MSIX:
1175
1176                 sprintf(enic->msix[ENIC_MSIX_RQ].devname,
1177                         "%.11s-rx-0", netdev->name);
1178                 enic->msix[ENIC_MSIX_RQ].isr = enic_isr_msix_rq;
1179                 enic->msix[ENIC_MSIX_RQ].devid = enic;
1180
1181                 sprintf(enic->msix[ENIC_MSIX_WQ].devname,
1182                         "%.11s-tx-0", netdev->name);
1183                 enic->msix[ENIC_MSIX_WQ].isr = enic_isr_msix_wq;
1184                 enic->msix[ENIC_MSIX_WQ].devid = enic;
1185
1186                 sprintf(enic->msix[ENIC_MSIX_ERR].devname,
1187                         "%.11s-err", netdev->name);
1188                 enic->msix[ENIC_MSIX_ERR].isr = enic_isr_msix_err;
1189                 enic->msix[ENIC_MSIX_ERR].devid = enic;
1190
1191                 sprintf(enic->msix[ENIC_MSIX_NOTIFY].devname,
1192                         "%.11s-notify", netdev->name);
1193                 enic->msix[ENIC_MSIX_NOTIFY].isr = enic_isr_msix_notify;
1194                 enic->msix[ENIC_MSIX_NOTIFY].devid = enic;
1195
1196                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++) {
1197                         err = request_irq(enic->msix_entry[i].vector,
1198                                 enic->msix[i].isr, 0,
1199                                 enic->msix[i].devname,
1200                                 enic->msix[i].devid);
1201                         if (err) {
1202                                 enic_free_intr(enic);
1203                                 break;
1204                         }
1205                         enic->msix[i].requested = 1;
1206                 }
1207
1208                 break;
1209
1210         default:
1211                 break;
1212         }
1213
1214         return err;
1215 }
1216
1217 static int enic_notify_set(struct enic *enic)
1218 {
1219         int err;
1220
1221         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1222         case VNIC_DEV_INTR_MODE_INTX:
1223                 err = vnic_dev_notify_set(enic->vdev, ENIC_INTX_NOTIFY);
1224                 break;
1225         case VNIC_DEV_INTR_MODE_MSIX:
1226                 err = vnic_dev_notify_set(enic->vdev, ENIC_MSIX_NOTIFY);
1227                 break;
1228         default:
1229                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1230                 break;
1231         }
1232
1233         return err;
1234 }
1235
1236 static void enic_notify_timer_start(struct enic *enic)
1237 {
1238         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1239         case VNIC_DEV_INTR_MODE_MSI:
1240                 mod_timer(&enic->notify_timer, jiffies);
1241                 break;
1242         default:
1243                 /* Using intr for notification for INTx/MSI-X */
1244                 break;
1245         };
1246 }
1247
1248 /* rtnl lock is held, process context */
1249 static int enic_open(struct net_device *netdev)
1250 {
1251         struct enic *enic = netdev_priv(netdev);
1252         unsigned int i;
1253         int err;
1254
1255         err = enic_request_intr(enic);
1256         if (err) {
1257                 printk(KERN_ERR PFX "%s: Unable to request irq.\n",
1258                         netdev->name);
1259                 return err;
1260         }
1261
1262         err = enic_notify_set(enic);
1263         if (err) {
1264                 printk(KERN_ERR PFX
1265                         "%s: Failed to alloc notify buffer, aborting.\n",
1266                         netdev->name);
1267                 goto err_out_free_intr;
1268         }
1269
1270         for (i = 0; i < enic->rq_count; i++) {
1271                 err = vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1272                 if (err) {
1273                         printk(KERN_ERR PFX
1274                                 "%s: Unable to alloc receive buffers.\n",
1275                                 netdev->name);
1276                         goto err_out_notify_unset;
1277                 }
1278         }
1279
1280         for (i = 0; i < enic->wq_count; i++)
1281                 vnic_wq_enable(&enic->wq[i]);
1282         for (i = 0; i < enic->rq_count; i++)
1283                 vnic_rq_enable(&enic->rq[i]);
1284
1285         enic_add_station_addr(enic);
1286         enic_set_multicast_list(netdev);
1287
1288         netif_wake_queue(netdev);
1289         napi_enable(&enic->napi);
1290         vnic_dev_enable(enic->vdev);
1291
1292         for (i = 0; i < enic->intr_count; i++)
1293                 vnic_intr_unmask(&enic->intr[i]);
1294
1295         enic_notify_timer_start(enic);
1296
1297         return 0;
1298
1299 err_out_notify_unset:
1300         vnic_dev_notify_unset(enic->vdev);
1301 err_out_free_intr:
1302         enic_free_intr(enic);
1303
1304         return err;
1305 }
1306
1307 /* rtnl lock is held, process context */
1308 static int enic_stop(struct net_device *netdev)
1309 {
1310         struct enic *enic = netdev_priv(netdev);
1311         unsigned int i;
1312         int err;
1313
1314         del_timer_sync(&enic->notify_timer);
1315
1316         vnic_dev_disable(enic->vdev);
1317         napi_disable(&enic->napi);
1318         netif_stop_queue(netdev);
1319
1320         for (i = 0; i < enic->intr_count; i++)
1321                 vnic_intr_mask(&enic->intr[i]);
1322
1323         for (i = 0; i < enic->wq_count; i++) {
1324                 err = vnic_wq_disable(&enic->wq[i]);
1325                 if (err)
1326                         return err;
1327         }
1328         for (i = 0; i < enic->rq_count; i++) {
1329                 err = vnic_rq_disable(&enic->rq[i]);
1330                 if (err)
1331                         return err;
1332         }
1333
1334         vnic_dev_notify_unset(enic->vdev);
1335         enic_free_intr(enic);
1336
1337         (void)vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1338                 -1, enic_rq_service_drop, NULL);
1339         (void)vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
1340                 -1, enic_wq_service, NULL);
1341
1342         for (i = 0; i < enic->wq_count; i++)
1343                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1344         for (i = 0; i < enic->rq_count; i++)
1345                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1346         for (i = 0; i < enic->cq_count; i++)
1347                 vnic_cq_clean(&enic->cq[i]);
1348         for (i = 0; i < enic->intr_count; i++)
1349                 vnic_intr_clean(&enic->intr[i]);
1350
1351         return 0;
1352 }
1353
1354 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1355 {
1356         struct enic *enic = netdev_priv(netdev);
1357         int running = netif_running(netdev);
1358
1359         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1360                 return -EINVAL;
1361
1362         if (running)
1363                 enic_stop(netdev);
1364
1365         netdev->mtu = new_mtu;
1366
1367         if (netdev->mtu > enic->port_mtu)
1368                 printk(KERN_WARNING PFX
1369                         "%s: interface MTU (%d) set higher "
1370                         "than port MTU (%d)\n",
1371                         netdev->name, netdev->mtu, enic->port_mtu);
1372
1373         if (running)
1374                 enic_open(netdev);
1375
1376         return 0;
1377 }
1378
1379 #ifdef CONFIG_NET_POLL_CONTROLLER
1380 static void enic_poll_controller(struct net_device *netdev)
1381 {
1382         struct enic *enic = netdev_priv(netdev);
1383         struct vnic_dev *vdev = enic->vdev;
1384
1385         switch (vnic_dev_get_intr_mode(vdev)) {
1386         case VNIC_DEV_INTR_MODE_MSIX:
1387                 enic_isr_msix_rq(enic->pdev->irq, enic);
1388                 enic_isr_msix_wq(enic->pdev->irq, enic);
1389                 break;
1390         case VNIC_DEV_INTR_MODE_MSI:
1391                 enic_isr_msi(enic->pdev->irq, enic);
1392                 break;
1393         case VNIC_DEV_INTR_MODE_INTX:
1394                 enic_isr_legacy(enic->pdev->irq, netdev);
1395                 break;
1396         default:
1397                 break;
1398         }
1399 }
1400 #endif
1401
1402 static int enic_dev_wait(struct vnic_dev *vdev,
1403         int (*start)(struct vnic_dev *, int),
1404         int (*finished)(struct vnic_dev *, int *),
1405         int arg)
1406 {
1407         unsigned long time;
1408         int done;
1409         int err;
1410
1411         BUG_ON(in_interrupt());
1412
1413         err = start(vdev, arg);
1414         if (err)
1415                 return err;
1416
1417         /* Wait for func to complete...2 seconds max
1418          */
1419
1420         time = jiffies + (HZ * 2);
1421         do {
1422
1423                 err = finished(vdev, &done);
1424                 if (err)
1425                         return err;
1426
1427                 if (done)
1428                         return 0;
1429
1430                 schedule_timeout_uninterruptible(HZ / 10);
1431
1432         } while (time_after(time, jiffies));
1433
1434         return -ETIMEDOUT;
1435 }
1436
1437 static int enic_dev_open(struct enic *enic)
1438 {
1439         int err;
1440
1441         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1442                 vnic_dev_open_done, 0);
1443         if (err)
1444                 printk(KERN_ERR PFX
1445                         "vNIC device open failed, err %d.\n", err);
1446
1447         return err;
1448 }
1449
1450 static int enic_dev_soft_reset(struct enic *enic)
1451 {
1452         int err;
1453
1454         err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
1455                 vnic_dev_soft_reset_done, 0);
1456         if (err)
1457                 printk(KERN_ERR PFX
1458                         "vNIC soft reset failed, err %d.\n", err);
1459
1460         return err;
1461 }
1462
1463 static int enic_set_niccfg(struct enic *enic)
1464 {
1465         const u8 rss_default_cpu = 0;
1466         const u8 rss_hash_type = 0;
1467         const u8 rss_hash_bits = 0;
1468         const u8 rss_base_cpu = 0;
1469         const u8 rss_enable = 0;
1470         const u8 tso_ipid_split_en = 0;
1471         const u8 ig_vlan_strip_en = 1;
1472
1473         /* Enable VLAN tag stripping.  RSS not enabled (yet).
1474         */
1475
1476         return enic_set_nic_cfg(enic,
1477                 rss_default_cpu, rss_hash_type,
1478                 rss_hash_bits, rss_base_cpu,
1479                 rss_enable, tso_ipid_split_en,
1480                 ig_vlan_strip_en);
1481 }
1482
1483 static void enic_reset(struct work_struct *work)
1484 {
1485         struct enic *enic = container_of(work, struct enic, reset);
1486
1487         if (!netif_running(enic->netdev))
1488                 return;
1489
1490         rtnl_lock();
1491
1492         spin_lock(&enic->devcmd_lock);
1493         vnic_dev_hang_notify(enic->vdev);
1494         spin_unlock(&enic->devcmd_lock);
1495
1496         enic_stop(enic->netdev);
1497         enic_dev_soft_reset(enic);
1498         vnic_dev_init(enic->vdev, 0);
1499         enic_reset_mcaddrs(enic);
1500         enic_init_vnic_resources(enic);
1501         enic_set_niccfg(enic);
1502         enic_open(enic->netdev);
1503
1504         rtnl_unlock();
1505 }
1506
1507 static int enic_set_intr_mode(struct enic *enic)
1508 {
1509         unsigned int n = ARRAY_SIZE(enic->rq);
1510         unsigned int m = ARRAY_SIZE(enic->wq);
1511         unsigned int i;
1512
1513         /* Set interrupt mode (INTx, MSI, MSI-X) depending
1514          * system capabilities.
1515          *
1516          * Try MSI-X first
1517          *
1518          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1519          * (the second to last INTR is used for WQ/RQ errors)
1520          * (the last INTR is used for notifications)
1521          */
1522
1523         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1524         for (i = 0; i < n + m + 2; i++)
1525                 enic->msix_entry[i].entry = i;
1526
1527         if (enic->config.intr_mode < 1 &&
1528             enic->rq_count >= n &&
1529             enic->wq_count >= m &&
1530             enic->cq_count >= n + m &&
1531             enic->intr_count >= n + m + 2 &&
1532             !pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {
1533
1534                 enic->rq_count = n;
1535                 enic->wq_count = m;
1536                 enic->cq_count = n + m;
1537                 enic->intr_count = n + m + 2;
1538
1539                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSIX);
1540
1541                 return 0;
1542         }
1543
1544         /* Next try MSI
1545          *
1546          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
1547          */
1548
1549         if (enic->config.intr_mode < 2 &&
1550             enic->rq_count >= 1 &&
1551             enic->wq_count >= 1 &&
1552             enic->cq_count >= 2 &&
1553             enic->intr_count >= 1 &&
1554             !pci_enable_msi(enic->pdev)) {
1555
1556                 enic->rq_count = 1;
1557                 enic->wq_count = 1;
1558                 enic->cq_count = 2;
1559                 enic->intr_count = 1;
1560
1561                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
1562
1563                 return 0;
1564         }
1565
1566         /* Next try INTx
1567          *
1568          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
1569          * (the first INTR is used for WQ/RQ)
1570          * (the second INTR is used for WQ/RQ errors)
1571          * (the last INTR is used for notifications)
1572          */
1573
1574         if (enic->config.intr_mode < 3 &&
1575             enic->rq_count >= 1 &&
1576             enic->wq_count >= 1 &&
1577             enic->cq_count >= 2 &&
1578             enic->intr_count >= 3) {
1579
1580                 enic->rq_count = 1;
1581                 enic->wq_count = 1;
1582                 enic->cq_count = 2;
1583                 enic->intr_count = 3;
1584
1585                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
1586
1587                 return 0;
1588         }
1589
1590         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1591
1592         return -EINVAL;
1593 }
1594
1595 static void enic_clear_intr_mode(struct enic *enic)
1596 {
1597         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1598         case VNIC_DEV_INTR_MODE_MSIX:
1599                 pci_disable_msix(enic->pdev);
1600                 break;
1601         case VNIC_DEV_INTR_MODE_MSI:
1602                 pci_disable_msi(enic->pdev);
1603                 break;
1604         default:
1605                 break;
1606         }
1607
1608         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1609 }
1610
1611 static void enic_iounmap(struct enic *enic)
1612 {
1613         if (enic->bar0.vaddr)
1614                 iounmap(enic->bar0.vaddr);
1615 }
1616
1617 static const struct net_device_ops enic_netdev_ops = {
1618         .ndo_open               = enic_open,
1619         .ndo_stop               = enic_stop,
1620         .ndo_start_xmit         = enic_hard_start_xmit,
1621         .ndo_get_stats          = enic_get_stats,
1622         .ndo_validate_addr      = eth_validate_addr,
1623         .ndo_set_mac_address    = eth_mac_addr,
1624         .ndo_set_multicast_list = enic_set_multicast_list,
1625         .ndo_change_mtu         = enic_change_mtu,
1626         .ndo_vlan_rx_register   = enic_vlan_rx_register,
1627         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
1628         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
1629         .ndo_tx_timeout         = enic_tx_timeout,
1630 #ifdef CONFIG_NET_POLL_CONTROLLER
1631         .ndo_poll_controller    = enic_poll_controller,
1632 #endif
1633 };
1634
1635 static int __devinit enic_probe(struct pci_dev *pdev,
1636         const struct pci_device_id *ent)
1637 {
1638         struct net_device *netdev;
1639         struct enic *enic;
1640         int using_dac = 0;
1641         unsigned int i;
1642         int err;
1643
1644         /* Allocate net device structure and initialize.  Private
1645          * instance data is initialized to zero.
1646          */
1647
1648         netdev = alloc_etherdev(sizeof(struct enic));
1649         if (!netdev) {
1650                 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1651                 return -ENOMEM;
1652         }
1653
1654         pci_set_drvdata(pdev, netdev);
1655
1656         SET_NETDEV_DEV(netdev, &pdev->dev);
1657
1658         enic = netdev_priv(netdev);
1659         enic->netdev = netdev;
1660         enic->pdev = pdev;
1661
1662         /* Setup PCI resources
1663          */
1664
1665         err = pci_enable_device(pdev);
1666         if (err) {
1667                 printk(KERN_ERR PFX
1668                         "Cannot enable PCI device, aborting.\n");
1669                 goto err_out_free_netdev;
1670         }
1671
1672         err = pci_request_regions(pdev, DRV_NAME);
1673         if (err) {
1674                 printk(KERN_ERR PFX
1675                         "Cannot request PCI regions, aborting.\n");
1676                 goto err_out_disable_device;
1677         }
1678
1679         pci_set_master(pdev);
1680
1681         /* Query PCI controller on system for DMA addressing
1682          * limitation for the device.  Try 40-bit first, and
1683          * fail to 32-bit.
1684          */
1685
1686         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40));
1687         if (err) {
1688                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1689                 if (err) {
1690                         printk(KERN_ERR PFX
1691                                 "No usable DMA configuration, aborting.\n");
1692                         goto err_out_release_regions;
1693                 }
1694                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1695                 if (err) {
1696                         printk(KERN_ERR PFX
1697                                 "Unable to obtain 32-bit DMA "
1698                                 "for consistent allocations, aborting.\n");
1699                         goto err_out_release_regions;
1700                 }
1701         } else {
1702                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40));
1703                 if (err) {
1704                         printk(KERN_ERR PFX
1705                                 "Unable to obtain 40-bit DMA "
1706                                 "for consistent allocations, aborting.\n");
1707                         goto err_out_release_regions;
1708                 }
1709                 using_dac = 1;
1710         }
1711
1712         /* Map vNIC resources from BAR0
1713          */
1714
1715         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
1716                 printk(KERN_ERR PFX
1717                         "BAR0 not memory-map'able, aborting.\n");
1718                 err = -ENODEV;
1719                 goto err_out_release_regions;
1720         }
1721
1722         enic->bar0.vaddr = pci_iomap(pdev, 0, enic->bar0.len);
1723         enic->bar0.bus_addr = pci_resource_start(pdev, 0);
1724         enic->bar0.len = pci_resource_len(pdev, 0);
1725
1726         if (!enic->bar0.vaddr) {
1727                 printk(KERN_ERR PFX
1728                         "Cannot memory-map BAR0 res hdr, aborting.\n");
1729                 err = -ENODEV;
1730                 goto err_out_release_regions;
1731         }
1732
1733         /* Register vNIC device
1734          */
1735
1736         enic->vdev = vnic_dev_register(NULL, enic, pdev, &enic->bar0);
1737         if (!enic->vdev) {
1738                 printk(KERN_ERR PFX
1739                         "vNIC registration failed, aborting.\n");
1740                 err = -ENODEV;
1741                 goto err_out_iounmap;
1742         }
1743
1744         /* Issue device open to get device in known state
1745          */
1746
1747         err = enic_dev_open(enic);
1748         if (err) {
1749                 printk(KERN_ERR PFX
1750                         "vNIC dev open failed, aborting.\n");
1751                 goto err_out_vnic_unregister;
1752         }
1753
1754         /* Issue device init to initialize the vnic-to-switch link.
1755          * We'll start with carrier off and wait for link UP
1756          * notification later to turn on carrier.  We don't need
1757          * to wait here for the vnic-to-switch link initialization
1758          * to complete; link UP notification is the indication that
1759          * the process is complete.
1760          */
1761
1762         netif_carrier_off(netdev);
1763
1764         err = vnic_dev_init(enic->vdev, 0);
1765         if (err) {
1766                 printk(KERN_ERR PFX
1767                         "vNIC dev init failed, aborting.\n");
1768                 goto err_out_dev_close;
1769         }
1770
1771         /* Get vNIC configuration
1772          */
1773
1774         err = enic_get_vnic_config(enic);
1775         if (err) {
1776                 printk(KERN_ERR PFX
1777                         "Get vNIC configuration failed, aborting.\n");
1778                 goto err_out_dev_close;
1779         }
1780
1781         /* Get available resource counts
1782          */
1783
1784         enic_get_res_counts(enic);
1785
1786         /* Set interrupt mode based on resource counts and system
1787          * capabilities
1788          */
1789
1790         err = enic_set_intr_mode(enic);
1791         if (err) {
1792                 printk(KERN_ERR PFX
1793                         "Failed to set intr mode, aborting.\n");
1794                 goto err_out_dev_close;
1795         }
1796
1797         /* Allocate and configure vNIC resources
1798          */
1799
1800         err = enic_alloc_vnic_resources(enic);
1801         if (err) {
1802                 printk(KERN_ERR PFX
1803                         "Failed to alloc vNIC resources, aborting.\n");
1804                 goto err_out_free_vnic_resources;
1805         }
1806
1807         enic_init_vnic_resources(enic);
1808
1809         err = enic_set_niccfg(enic);
1810         if (err) {
1811                 printk(KERN_ERR PFX
1812                         "Failed to config nic, aborting.\n");
1813                 goto err_out_free_vnic_resources;
1814         }
1815
1816         /* Setup notification timer, HW reset task, and locks
1817          */
1818
1819         init_timer(&enic->notify_timer);
1820         enic->notify_timer.function = enic_notify_timer;
1821         enic->notify_timer.data = (unsigned long)enic;
1822
1823         INIT_WORK(&enic->reset, enic_reset);
1824
1825         for (i = 0; i < enic->wq_count; i++)
1826                 spin_lock_init(&enic->wq_lock[i]);
1827
1828         spin_lock_init(&enic->devcmd_lock);
1829
1830         /* Register net device
1831          */
1832
1833         enic->port_mtu = enic->config.mtu;
1834         (void)enic_change_mtu(netdev, enic->port_mtu);
1835
1836         err = enic_set_mac_addr(netdev, enic->mac_addr);
1837         if (err) {
1838                 printk(KERN_ERR PFX
1839                         "Invalid MAC address, aborting.\n");
1840                 goto err_out_free_vnic_resources;
1841         }
1842
1843         netdev->netdev_ops = &enic_netdev_ops;
1844         netdev->watchdog_timeo = 2 * HZ;
1845         netdev->ethtool_ops = &enic_ethtool_ops;
1846
1847         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1848         default:
1849                 netif_napi_add(netdev, &enic->napi, enic_poll, 64);
1850                 break;
1851         case VNIC_DEV_INTR_MODE_MSIX:
1852                 netif_napi_add(netdev, &enic->napi, enic_poll_msix, 64);
1853                 break;
1854         }
1855
1856         netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
1857         if (ENIC_SETTING(enic, TXCSUM))
1858                 netdev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1859         if (ENIC_SETTING(enic, TSO))
1860                 netdev->features |= NETIF_F_TSO |
1861                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
1862         if (ENIC_SETTING(enic, LRO))
1863                 netdev->features |= NETIF_F_LRO;
1864         if (using_dac)
1865                 netdev->features |= NETIF_F_HIGHDMA;
1866
1867         enic->csum_rx_enabled = ENIC_SETTING(enic, RXCSUM);
1868
1869         enic->lro_mgr.max_aggr = ENIC_LRO_MAX_AGGR;
1870         enic->lro_mgr.max_desc = ENIC_LRO_MAX_DESC;
1871         enic->lro_mgr.lro_arr = enic->lro_desc;
1872         enic->lro_mgr.get_skb_header = enic_get_skb_header;
1873         enic->lro_mgr.features  = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
1874         enic->lro_mgr.dev = netdev;
1875         enic->lro_mgr.ip_summed = CHECKSUM_COMPLETE;
1876         enic->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1877
1878         err = register_netdev(netdev);
1879         if (err) {
1880                 printk(KERN_ERR PFX
1881                         "Cannot register net device, aborting.\n");
1882                 goto err_out_free_vnic_resources;
1883         }
1884
1885         return 0;
1886
1887 err_out_free_vnic_resources:
1888         enic_free_vnic_resources(enic);
1889 err_out_dev_close:
1890         vnic_dev_close(enic->vdev);
1891 err_out_vnic_unregister:
1892         enic_clear_intr_mode(enic);
1893         vnic_dev_unregister(enic->vdev);
1894 err_out_iounmap:
1895         enic_iounmap(enic);
1896 err_out_release_regions:
1897         pci_release_regions(pdev);
1898 err_out_disable_device:
1899         pci_disable_device(pdev);
1900 err_out_free_netdev:
1901         pci_set_drvdata(pdev, NULL);
1902         free_netdev(netdev);
1903
1904         return err;
1905 }
1906
1907 static void __devexit enic_remove(struct pci_dev *pdev)
1908 {
1909         struct net_device *netdev = pci_get_drvdata(pdev);
1910
1911         if (netdev) {
1912                 struct enic *enic = netdev_priv(netdev);
1913
1914                 flush_scheduled_work();
1915                 unregister_netdev(netdev);
1916                 enic_free_vnic_resources(enic);
1917                 vnic_dev_close(enic->vdev);
1918                 enic_clear_intr_mode(enic);
1919                 vnic_dev_unregister(enic->vdev);
1920                 enic_iounmap(enic);
1921                 pci_release_regions(pdev);
1922                 pci_disable_device(pdev);
1923                 pci_set_drvdata(pdev, NULL);
1924                 free_netdev(netdev);
1925         }
1926 }
1927
1928 static struct pci_driver enic_driver = {
1929         .name = DRV_NAME,
1930         .id_table = enic_id_table,
1931         .probe = enic_probe,
1932         .remove = __devexit_p(enic_remove),
1933 };
1934
1935 static int __init enic_init_module(void)
1936 {
1937         printk(KERN_INFO PFX "%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
1938
1939         return pci_register_driver(&enic_driver);
1940 }
1941
1942 static void __exit enic_cleanup_module(void)
1943 {
1944         pci_unregister_driver(&enic_driver);
1945 }
1946
1947 module_init(enic_init_module);
1948 module_exit(enic_cleanup_module);