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 #define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  48 #define MAX_TSO                         (1 << 16)
  49 #define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  50
  51 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  52
  53 /* Supported devices */
  54 static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
  55         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  56         { 0, }  /* end of table */
  57 };
  58
  59 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  60 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  61 MODULE_LICENSE("GPL");
  62 MODULE_VERSION(DRV_VERSION);
  63 MODULE_DEVICE_TABLE(pci, enic_id_table);
  64
  65 struct enic_stat {
  66         char name[ETH_GSTRING_LEN];
  67         unsigned int offset;
  68 };
  69
  70 #define ENIC_TX_STAT(stat)      \
  71         { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
  72 #define ENIC_RX_STAT(stat)      \
  73         { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
  74
  75 static const struct enic_stat enic_tx_stats[] = {
  76         ENIC_TX_STAT(tx_frames_ok),
  77         ENIC_TX_STAT(tx_unicast_frames_ok),
  78         ENIC_TX_STAT(tx_multicast_frames_ok),
  79         ENIC_TX_STAT(tx_broadcast_frames_ok),
  80         ENIC_TX_STAT(tx_bytes_ok),
  81         ENIC_TX_STAT(tx_unicast_bytes_ok),
  82         ENIC_TX_STAT(tx_multicast_bytes_ok),
  83         ENIC_TX_STAT(tx_broadcast_bytes_ok),
  84         ENIC_TX_STAT(tx_drops),
  85         ENIC_TX_STAT(tx_errors),
  86         ENIC_TX_STAT(tx_tso),
  87 };
  88
  89 static const struct enic_stat enic_rx_stats[] = {
  90         ENIC_RX_STAT(rx_frames_ok),
  91         ENIC_RX_STAT(rx_frames_total),
  92         ENIC_RX_STAT(rx_unicast_frames_ok),
  93         ENIC_RX_STAT(rx_multicast_frames_ok),
  94         ENIC_RX_STAT(rx_broadcast_frames_ok),
  95         ENIC_RX_STAT(rx_bytes_ok),
  96         ENIC_RX_STAT(rx_unicast_bytes_ok),
  97         ENIC_RX_STAT(rx_multicast_bytes_ok),
  98         ENIC_RX_STAT(rx_broadcast_bytes_ok),
  99         ENIC_RX_STAT(rx_drop),
 100         ENIC_RX_STAT(rx_no_bufs),
 101         ENIC_RX_STAT(rx_errors),
 102         ENIC_RX_STAT(rx_rss),
 103         ENIC_RX_STAT(rx_crc_errors),
 104         ENIC_RX_STAT(rx_frames_64),
 105         ENIC_RX_STAT(rx_frames_127),
 106         ENIC_RX_STAT(rx_frames_255),
 107         ENIC_RX_STAT(rx_frames_511),
 108         ENIC_RX_STAT(rx_frames_1023),
 109         ENIC_RX_STAT(rx_frames_1518),
 110         ENIC_RX_STAT(rx_frames_to_max),
 111 };
 112
 113 static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
 114 static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
 115
 116 static int enic_get_settings(struct net_device *netdev,
 117         struct ethtool_cmd *ecmd)
 118 {
 119         struct enic *enic = netdev_priv(netdev);
 120
 121         ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
 122         ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
 123         ecmd->port = PORT_FIBRE;
 124         ecmd->transceiver = XCVR_EXTERNAL;
 125
 126         if (netif_carrier_ok(netdev)) {
 127                 ecmd->speed = vnic_dev_port_speed(enic->vdev);
 128                 ecmd->duplex = DUPLEX_FULL;
 129         } else {
 130                 ecmd->speed = -1;
 131                 ecmd->duplex = -1;
 132         }
 133
 134         ecmd->autoneg = AUTONEG_DISABLE;
 135
 136         return 0;
 137 }
 138
 139 static void enic_get_drvinfo(struct net_device *netdev,
 140         struct ethtool_drvinfo *drvinfo)
 141 {
 142         struct enic *enic = netdev_priv(netdev);
 143         struct vnic_devcmd_fw_info *fw_info;
 144
 145         spin_lock(&enic->devcmd_lock);
 146         vnic_dev_fw_info(enic->vdev, &fw_info);
 147         spin_unlock(&enic->devcmd_lock);
 148
 149         strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
 150         strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
 151         strncpy(drvinfo->fw_version, fw_info->fw_version,
 152                 sizeof(drvinfo->fw_version));
 153         strncpy(drvinfo->bus_info, pci_name(enic->pdev),
 154                 sizeof(drvinfo->bus_info));
 155 }
 156
 157 static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
 158 {
 159         unsigned int i;
 160
 161         switch (stringset) {
 162         case ETH_SS_STATS:
 163                 for (i = 0; i < enic_n_tx_stats; i++) {
 164                         memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
 165                         data += ETH_GSTRING_LEN;
 166                 }
 167                 for (i = 0; i < enic_n_rx_stats; i++) {
 168                         memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
 169                         data += ETH_GSTRING_LEN;
 170                 }
 171                 break;
 172         }
 173 }
 174
 175 static int enic_get_sset_count(struct net_device *netdev, int sset)
 176 {
 177         switch (sset) {
 178         case ETH_SS_STATS:
 179                 return enic_n_tx_stats + enic_n_rx_stats;
 180         default:
 181                 return -EOPNOTSUPP;
 182         }
 183 }
 184
 185 static void enic_get_ethtool_stats(struct net_device *netdev,
 186         struct ethtool_stats *stats, u64 *data)
 187 {
 188         struct enic *enic = netdev_priv(netdev);
 189         struct vnic_stats *vstats;
 190         unsigned int i;
 191
 192         spin_lock(&enic->devcmd_lock);
 193         vnic_dev_stats_dump(enic->vdev, &vstats);
 194         spin_unlock(&enic->devcmd_lock);
 195
 196         for (i = 0; i < enic_n_tx_stats; i++)
 197                 *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
 198         for (i = 0; i < enic_n_rx_stats; i++)
 199                 *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
 200 }
 201
 202 static u32 enic_get_rx_csum(struct net_device *netdev)
 203 {
 204         struct enic *enic = netdev_priv(netdev);
 205         return enic->csum_rx_enabled;
 206 }
 207
 208 static int enic_set_rx_csum(struct net_device *netdev, u32 data)
 209 {
 210         struct enic *enic = netdev_priv(netdev);
 211
 212         if (data && !ENIC_SETTING(enic, RXCSUM))
 213                 return -EINVAL;
 214
 215         enic->csum_rx_enabled = !!data;
 216
 217         return 0;
 218 }
 219
 220 static int enic_set_tx_csum(struct net_device *netdev, u32 data)
 221 {
 222         struct enic *enic = netdev_priv(netdev);
 223
 224         if (data && !ENIC_SETTING(enic, TXCSUM))
 225                 return -EINVAL;
 226
 227         if (data)
 228                 netdev->features |= NETIF_F_HW_CSUM;
 229         else
 230                 netdev->features &= ~NETIF_F_HW_CSUM;
 231
 232         return 0;
 233 }
 234
 235 static int enic_set_tso(struct net_device *netdev, u32 data)
 236 {
 237         struct enic *enic = netdev_priv(netdev);
 238
 239         if (data && !ENIC_SETTING(enic, TSO))
 240                 return -EINVAL;
 241
 242         if (data)
 243                 netdev->features |=
 244                         NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN;
 245         else
 246                 netdev->features &=
 247                         ~(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN);
 248
 249         return 0;
 250 }
 251
 252 static u32 enic_get_msglevel(struct net_device *netdev)
 253 {
 254         struct enic *enic = netdev_priv(netdev);
 255         return enic->msg_enable;
 256 }
 257
 258 static void enic_set_msglevel(struct net_device *netdev, u32 value)
 259 {
 260         struct enic *enic = netdev_priv(netdev);
 261         enic->msg_enable = value;
 262 }
 263
 264 static int enic_get_coalesce(struct net_device *netdev,
 265         struct ethtool_coalesce *ecmd)
 266 {
 267         struct enic *enic = netdev_priv(netdev);
 268
 269         ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
 270         ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
 271
 272         return 0;
 273 }
 274
 275 static int enic_set_coalesce(struct net_device *netdev,
 276         struct ethtool_coalesce *ecmd)
 277 {
 278         struct enic *enic = netdev_priv(netdev);
 279         u32 tx_coalesce_usecs;
 280         u32 rx_coalesce_usecs;
 281
 282         tx_coalesce_usecs = min_t(u32,
 283                 INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
 284                 ecmd->tx_coalesce_usecs);
 285         rx_coalesce_usecs = min_t(u32,
 286                 INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
 287                 ecmd->rx_coalesce_usecs);
 288
 289         switch (vnic_dev_get_intr_mode(enic->vdev)) {
 290         case VNIC_DEV_INTR_MODE_INTX:
 291                 if (tx_coalesce_usecs != rx_coalesce_usecs)
 292                         return -EINVAL;
 293
 294                 vnic_intr_coalescing_timer_set(&enic->intr[ENIC_INTX_WQ_RQ],
 295                         INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
 296                 break;
 297         case VNIC_DEV_INTR_MODE_MSI:
 298                 if (tx_coalesce_usecs != rx_coalesce_usecs)
 299                         return -EINVAL;
 300
 301                 vnic_intr_coalescing_timer_set(&enic->intr[0],
 302                         INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
 303                 break;
 304         case VNIC_DEV_INTR_MODE_MSIX:
 305                 vnic_intr_coalescing_timer_set(&enic->intr[ENIC_MSIX_WQ],
 306                         INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
 307                 vnic_intr_coalescing_timer_set(&enic->intr[ENIC_MSIX_RQ],
 308                         INTR_COALESCE_USEC_TO_HW(rx_coalesce_usecs));
 309                 break;
 310         default:
 311                 break;
 312         }
 313
 314         enic->tx_coalesce_usecs = tx_coalesce_usecs;
 315         enic->rx_coalesce_usecs = rx_coalesce_usecs;
 316
 317         return 0;
 318 }
 319
 320 static const struct ethtool_ops enic_ethtool_ops = {
 321         .get_settings = enic_get_settings,
 322         .get_drvinfo = enic_get_drvinfo,
 323         .get_msglevel = enic_get_msglevel,
 324         .set_msglevel = enic_set_msglevel,
 325         .get_link = ethtool_op_get_link,
 326         .get_strings = enic_get_strings,
 327         .get_sset_count = enic_get_sset_count,
 328         .get_ethtool_stats = enic_get_ethtool_stats,
 329         .get_rx_csum = enic_get_rx_csum,
 330         .set_rx_csum = enic_set_rx_csum,
 331         .get_tx_csum = ethtool_op_get_tx_csum,
 332         .set_tx_csum = enic_set_tx_csum,
 333         .get_sg = ethtool_op_get_sg,
 334         .set_sg = ethtool_op_set_sg,
 335         .get_tso = ethtool_op_get_tso,
 336         .set_tso = enic_set_tso,
 337         .get_coalesce = enic_get_coalesce,
 338         .set_coalesce = enic_set_coalesce,
 339         .get_flags = ethtool_op_get_flags,
 340         .set_flags = ethtool_op_set_flags,
 341 };
 342
 343 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 344 {
 345         struct enic *enic = vnic_dev_priv(wq->vdev);
 346
 347         if (buf->sop)
 348                 pci_unmap_single(enic->pdev, buf->dma_addr,
 349                         buf->len, PCI_DMA_TODEVICE);
 350         else
 351                 pci_unmap_page(enic->pdev, buf->dma_addr,
 352                         buf->len, PCI_DMA_TODEVICE);
 353
 354         if (buf->os_buf)
 355                 dev_kfree_skb_any(buf->os_buf);
 356 }
 357
 358 static void enic_wq_free_buf(struct vnic_wq *wq,
 359         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 360 {
 361         enic_free_wq_buf(wq, buf);
 362 }
 363
 364 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 365         u8 type, u16 q_number, u16 completed_index, void *opaque)
 366 {
 367         struct enic *enic = vnic_dev_priv(vdev);
 368
 369         spin_lock(&enic->wq_lock[q_number]);
 370
 371         vnic_wq_service(&enic->wq[q_number], cq_desc,
 372                 completed_index, enic_wq_free_buf,
 373                 opaque);
 374
 375         if (netif_queue_stopped(enic->netdev) &&
 376             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 377             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 378                 netif_wake_queue(enic->netdev);
 379
 380         spin_unlock(&enic->wq_lock[q_number]);
 381
 382         return 0;
 383 }
 384
 385 static void enic_log_q_error(struct enic *enic)
 386 {
 387         unsigned int i;
 388         u32 error_status;
 389
 390         for (i = 0; i < enic->wq_count; i++) {
 391                 error_status = vnic_wq_error_status(&enic->wq[i]);
 392                 if (error_status)
 393                         printk(KERN_ERR PFX "%s: WQ[%d] error_status %d\n",
 394                                 enic->netdev->name, i, error_status);
 395         }
 396
 397         for (i = 0; i < enic->rq_count; i++) {
 398                 error_status = vnic_rq_error_status(&enic->rq[i]);
 399                 if (error_status)
 400                         printk(KERN_ERR PFX "%s: RQ[%d] error_status %d\n",
 401                                 enic->netdev->name, i, error_status);
 402         }
 403 }
 404
 405 static void enic_link_check(struct enic *enic)
 406 {
 407         int link_status = vnic_dev_link_status(enic->vdev);
 408         int carrier_ok = netif_carrier_ok(enic->netdev);
 409
 410         if (link_status && !carrier_ok) {
 411                 printk(KERN_INFO PFX "%s: Link UP\n", enic->netdev->name);
 412                 netif_carrier_on(enic->netdev);
 413         } else if (!link_status && carrier_ok) {
 414                 printk(KERN_INFO PFX "%s: Link DOWN\n", enic->netdev->name);
 415                 netif_carrier_off(enic->netdev);
 416         }
 417 }
 418
 419 static void enic_mtu_check(struct enic *enic)
 420 {
 421         u32 mtu = vnic_dev_mtu(enic->vdev);
 422
 423         if (mtu && mtu != enic->port_mtu) {
 424                 enic->port_mtu = mtu;
 425                 if (mtu < enic->netdev->mtu)
 426                         printk(KERN_WARNING PFX
 427                                 "%s: interface MTU (%d) set higher "
 428                                 "than switch port MTU (%d)\n",
 429                                 enic->netdev->name, enic->netdev->mtu, mtu);
 430         }
 431 }
 432
 433 static void enic_msglvl_check(struct enic *enic)
 434 {
 435         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 436
 437         if (msg_enable != enic->msg_enable) {
 438                 printk(KERN_INFO PFX "%s: msg lvl changed from 0x%x to 0x%x\n",
 439                         enic->netdev->name, enic->msg_enable, msg_enable);
 440                 enic->msg_enable = msg_enable;
 441         }
 442 }
 443
 444 static void enic_notify_check(struct enic *enic)
 445 {
 446         enic_msglvl_check(enic);
 447         enic_mtu_check(enic);
 448         enic_link_check(enic);
 449 }
 450
 451 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 452
 453 static irqreturn_t enic_isr_legacy(int irq, void *data)
 454 {
 455         struct net_device *netdev = data;
 456         struct enic *enic = netdev_priv(netdev);
 457         u32 pba;
 458
 459         vnic_intr_mask(&enic->intr[ENIC_INTX_WQ_RQ]);
 460
 461         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 462         if (!pba) {
 463                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
 464                 return IRQ_NONE;        /* not our interrupt */
 465         }
 466
 467         if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY)) {
 468                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_NOTIFY]);
 469                 enic_notify_check(enic);
 470         }
 471
 472         if (ENIC_TEST_INTR(pba, ENIC_INTX_ERR)) {
 473                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_ERR]);
 474                 enic_log_q_error(enic);
 475                 /* schedule recovery from WQ/RQ error */
 476                 schedule_work(&enic->reset);
 477                 return IRQ_HANDLED;
 478         }
 479
 480         if (ENIC_TEST_INTR(pba, ENIC_INTX_WQ_RQ)) {
 481                 if (napi_schedule_prep(&enic->napi))
 482                         __napi_schedule(&enic->napi);
 483         } else {
 484                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
 485         }
 486
 487         return IRQ_HANDLED;
 488 }
 489
 490 static irqreturn_t enic_isr_msi(int irq, void *data)
 491 {
 492         struct enic *enic = data;
 493
 494         /* With MSI, there is no sharing of interrupts, so this is
 495          * our interrupt and there is no need to ack it.  The device
 496          * is not providing per-vector masking, so the OS will not
 497          * write to PCI config space to mask/unmask the interrupt.
 498          * We're using mask_on_assertion for MSI, so the device
 499          * automatically masks the interrupt when the interrupt is
 500          * generated.  Later, when exiting polling, the interrupt
 501          * will be unmasked (see enic_poll).
 502          *
 503          * Also, the device uses the same PCIe Traffic Class (TC)
 504          * for Memory Write data and MSI, so there are no ordering
 505          * issues; the MSI will always arrive at the Root Complex
 506          * _after_ corresponding Memory Writes (i.e. descriptor
 507          * writes).
 508          */
 509
 510         napi_schedule(&enic->napi);
 511
 512         return IRQ_HANDLED;
 513 }
 514
 515 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
 516 {
 517         struct enic *enic = data;
 518
 519         /* schedule NAPI polling for RQ cleanup */
 520         napi_schedule(&enic->napi);
 521
 522         return IRQ_HANDLED;
 523 }
 524
 525 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
 526 {
 527         struct enic *enic = data;
 528         unsigned int wq_work_to_do = -1; /* no limit */
 529         unsigned int wq_work_done;
 530
 531         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
 532                 wq_work_to_do, enic_wq_service, NULL);
 533
 534         vnic_intr_return_credits(&enic->intr[ENIC_MSIX_WQ],
 535                 wq_work_done,
 536                 1 /* unmask intr */,
 537                 1 /* reset intr timer */);
 538
 539         return IRQ_HANDLED;
 540 }
 541
 542 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 543 {
 544         struct enic *enic = data;
 545
 546         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_ERR]);
 547
 548         enic_log_q_error(enic);
 549
 550         /* schedule recovery from WQ/RQ error */
 551         schedule_work(&enic->reset);
 552
 553         return IRQ_HANDLED;
 554 }
 555
 556 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 557 {
 558         struct enic *enic = data;
 559
 560         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_NOTIFY]);
 561         enic_notify_check(enic);
 562
 563         return IRQ_HANDLED;
 564 }
 565
 566 static inline void enic_queue_wq_skb_cont(struct enic *enic,
 567         struct vnic_wq *wq, struct sk_buff *skb,
 568         unsigned int len_left)
 569 {
 570         skb_frag_t *frag;
 571
 572         /* Queue additional data fragments */
 573         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 574                 len_left -= frag->size;
 575                 enic_queue_wq_desc_cont(wq, skb,
 576                         pci_map_page(enic->pdev, frag->page,
 577                                 frag->page_offset, frag->size,
 578                                 PCI_DMA_TODEVICE),
 579                         frag->size,
 580                         (len_left == 0));       /* EOP? */
 581         }
 582 }
 583
 584 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
 585         struct vnic_wq *wq, struct sk_buff *skb,
 586         int vlan_tag_insert, unsigned int vlan_tag)
 587 {
 588         unsigned int head_len = skb_headlen(skb);
 589         unsigned int len_left = skb->len - head_len;
 590         int eop = (len_left == 0);
 591
 592         /* Queue the main skb fragment. The fragments are no larger
 593          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 594          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 595          * per fragment is queued.
 596          */
 597         enic_queue_wq_desc(wq, skb,
 598                 pci_map_single(enic->pdev, skb->data,
 599                         head_len, PCI_DMA_TODEVICE),
 600                 head_len,
 601                 vlan_tag_insert, vlan_tag,
 602                 eop);
 603
 604         if (!eop)
 605                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
 606 }
 607
 608 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
 609         struct vnic_wq *wq, struct sk_buff *skb,
 610         int vlan_tag_insert, unsigned int vlan_tag)
 611 {
 612         unsigned int head_len = skb_headlen(skb);
 613         unsigned int len_left = skb->len - head_len;
 614         unsigned int hdr_len = skb_transport_offset(skb);
 615         unsigned int csum_offset = hdr_len + skb->csum_offset;
 616         int eop = (len_left == 0);
 617
 618         /* Queue the main skb fragment. The fragments are no larger
 619          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 620          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 621          * per fragment is queued.
 622          */
 623         enic_queue_wq_desc_csum_l4(wq, skb,
 624                 pci_map_single(enic->pdev, skb->data,
 625                         head_len, PCI_DMA_TODEVICE),
 626                 head_len,
 627                 csum_offset,
 628                 hdr_len,
 629                 vlan_tag_insert, vlan_tag,
 630                 eop);
 631
 632         if (!eop)
 633                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
 634 }
 635
 636 static inline void enic_queue_wq_skb_tso(struct enic *enic,
 637         struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
 638         int vlan_tag_insert, unsigned int vlan_tag)
 639 {
 640         unsigned int frag_len_left = skb_headlen(skb);
 641         unsigned int len_left = skb->len - frag_len_left;
 642         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 643         int eop = (len_left == 0);
 644         unsigned int len;
 645         dma_addr_t dma_addr;
 646         unsigned int offset = 0;
 647         skb_frag_t *frag;
 648
 649         /* Preload TCP csum field with IP pseudo hdr calculated
 650          * with IP length set to zero.  HW will later add in length
 651          * to each TCP segment resulting from the TSO.
 652          */
 653
 654         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 655                 ip_hdr(skb)->check = 0;
 656                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 657                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 658         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 659                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 660                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 661         }
 662
 663         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 664          * for the main skb fragment
 665          */
 666         while (frag_len_left) {
 667                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 668                 dma_addr = pci_map_single(enic->pdev, skb->data + offset,
 669                                 len, PCI_DMA_TODEVICE);
 670                 enic_queue_wq_desc_tso(wq, skb,
 671                         dma_addr,
 672                         len,
 673                         mss, hdr_len,
 674                         vlan_tag_insert, vlan_tag,
 675                         eop && (len == frag_len_left));
 676                 frag_len_left -= len;
 677                 offset += len;
 678         }
 679
 680         if (eop)
 681                 return;
 682
 683         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 684          * for additional data fragments
 685          */
 686         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 687                 len_left -= frag->size;
 688                 frag_len_left = frag->size;
 689                 offset = frag->page_offset;
 690
 691                 while (frag_len_left) {
 692                         len = min(frag_len_left,
 693                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 694                         dma_addr = pci_map_page(enic->pdev, frag->page,
 695                                 offset, len,
 696                                 PCI_DMA_TODEVICE);
 697                         enic_queue_wq_desc_cont(wq, skb,
 698                                 dma_addr,
 699                                 len,
 700                                 (len_left == 0) &&
 701                                 (len == frag_len_left));        /* EOP? */
 702                         frag_len_left -= len;
 703                         offset += len;
 704                 }
 705         }
 706 }
 707
 708 static inline void enic_queue_wq_skb(struct enic *enic,
 709         struct vnic_wq *wq, struct sk_buff *skb)
 710 {
 711         unsigned int mss = skb_shinfo(skb)->gso_size;
 712         unsigned int vlan_tag = 0;
 713         int vlan_tag_insert = 0;
 714
 715         if (enic->vlan_group && vlan_tx_tag_present(skb)) {
 716                 /* VLAN tag from trunking driver */
 717                 vlan_tag_insert = 1;
 718                 vlan_tag = vlan_tx_tag_get(skb);
 719         }
 720
 721         if (mss)
 722                 enic_queue_wq_skb_tso(enic, wq, skb, mss,
 723                         vlan_tag_insert, vlan_tag);
 724         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 725                 enic_queue_wq_skb_csum_l4(enic, wq, skb,
 726                         vlan_tag_insert, vlan_tag);
 727         else
 728                 enic_queue_wq_skb_vlan(enic, wq, skb,
 729                         vlan_tag_insert, vlan_tag);
 730 }
 731
 732 /* netif_tx_lock held, process context with BHs disabled, or BH */
 733 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 734         struct net_device *netdev)
 735 {
 736         struct enic *enic = netdev_priv(netdev);
 737         struct vnic_wq *wq = &enic->wq[0];
 738         unsigned long flags;
 739
 740         if (skb->len <= 0) {
 741                 dev_kfree_skb(skb);
 742                 return NETDEV_TX_OK;
 743         }
 744
 745         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 746          * which is very likely.  In the off chance it's going to take
 747          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 748          */
 749
 750         if (skb_shinfo(skb)->gso_size == 0 &&
 751             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 752             skb_linearize(skb)) {
 753                 dev_kfree_skb(skb);
 754                 return NETDEV_TX_OK;
 755         }
 756
 757         spin_lock_irqsave(&enic->wq_lock[0], flags);
 758
 759         if (vnic_wq_desc_avail(wq) <
 760             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 761                 netif_stop_queue(netdev);
 762                 /* This is a hard error, log it */
 763                 printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
 764                         "queue awake!\n", netdev->name);
 765                 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
 766                 return NETDEV_TX_BUSY;
 767         }
 768
 769         enic_queue_wq_skb(enic, wq, skb);
 770
 771         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 772                 netif_stop_queue(netdev);
 773
 774         spin_unlock_irqrestore(&enic->wq_lock[0], flags);
 775
 776         return NETDEV_TX_OK;
 777 }
 778
 779 /* dev_base_lock rwlock held, nominally process context */
 780 static struct net_device_stats *enic_get_stats(struct net_device *netdev)
 781 {
 782         struct enic *enic = netdev_priv(netdev);
 783         struct net_device_stats *net_stats = &netdev->stats;
 784         struct vnic_stats *stats;
 785
 786         spin_lock(&enic->devcmd_lock);
 787         vnic_dev_stats_dump(enic->vdev, &stats);
 788         spin_unlock(&enic->devcmd_lock);
 789
 790         net_stats->tx_packets = stats->tx.tx_frames_ok;
 791         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 792         net_stats->tx_errors = stats->tx.tx_errors;
 793         net_stats->tx_dropped = stats->tx.tx_drops;
 794
 795         net_stats->rx_packets = stats->rx.rx_frames_ok;
 796         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 797         net_stats->rx_errors = stats->rx.rx_errors;
 798         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 799         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 800         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 801         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 802
 803         return net_stats;
 804 }
 805
 806 static void enic_reset_mcaddrs(struct enic *enic)
 807 {
 808         enic->mc_count = 0;
 809 }
 810
 811 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 812 {
 813         if (!is_valid_ether_addr(addr))
 814                 return -EADDRNOTAVAIL;
 815
 816         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 817
 818         return 0;
 819 }
 820
 821 /* netif_tx_lock held, BHs disabled */
 822 static void enic_set_multicast_list(struct net_device *netdev)
 823 {
 824         struct enic *enic = netdev_priv(netdev);
 825         struct netdev_hw_addr *ha;
 826         int directed = 1;
 827         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 828         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 829         int promisc = (netdev->flags & IFF_PROMISC) ? 1 : 0;
 830         unsigned int mc_count = netdev_mc_count(netdev);
 831         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 832                 mc_count > ENIC_MULTICAST_PERFECT_FILTERS;
 833         unsigned int flags = netdev->flags | (allmulti ? IFF_ALLMULTI : 0);
 834         u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
 835         unsigned int i, j;
 836
 837         if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS)
 838                 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
 839
 840         spin_lock(&enic->devcmd_lock);
 841
 842         if (enic->flags != flags) {
 843                 enic->flags = flags;
 844                 vnic_dev_packet_filter(enic->vdev, directed,
 845                         multicast, broadcast, promisc, allmulti);
 846         }
 847
 848         /* Is there an easier way?  Trying to minimize to
 849          * calls to add/del multicast addrs.  We keep the
 850          * addrs from the last call in enic->mc_addr and
 851          * look for changes to add/del.
 852          */
 853
 854         i = 0;
 855         netdev_for_each_mc_addr(ha, netdev) {
 856                 if (i == mc_count)
 857                         break;
 858                 memcpy(mc_addr[i++], ha->addr, ETH_ALEN);
 859         }
 860
 861         for (i = 0; i < enic->mc_count; i++) {
 862                 for (j = 0; j < mc_count; j++)
 863                         if (compare_ether_addr(enic->mc_addr[i],
 864                                 mc_addr[j]) == 0)
 865                                 break;
 866                 if (j == mc_count)
 867                         enic_del_multicast_addr(enic, enic->mc_addr[i]);
 868         }
 869
 870         for (i = 0; i < mc_count; i++) {
 871                 for (j = 0; j < enic->mc_count; j++)
 872                         if (compare_ether_addr(mc_addr[i],
 873                                 enic->mc_addr[j]) == 0)
 874                                 break;
 875                 if (j == enic->mc_count)
 876                         enic_add_multicast_addr(enic, mc_addr[i]);
 877         }
 878
 879         /* Save the list to compare against next time
 880          */
 881
 882         for (i = 0; i < mc_count; i++)
 883                 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
 884
 885         enic->mc_count = mc_count;
 886
 887         spin_unlock(&enic->devcmd_lock);
 888 }
 889
 890 /* rtnl lock is held */
 891 static void enic_vlan_rx_register(struct net_device *netdev,
 892         struct vlan_group *vlan_group)
 893 {
 894         struct enic *enic = netdev_priv(netdev);
 895         enic->vlan_group = vlan_group;
 896 }
 897
 898 /* rtnl lock is held */
 899 static void enic_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
 900 {
 901         struct enic *enic = netdev_priv(netdev);
 902
 903         spin_lock(&enic->devcmd_lock);
 904         enic_add_vlan(enic, vid);
 905         spin_unlock(&enic->devcmd_lock);
 906 }
 907
 908 /* rtnl lock is held */
 909 static void enic_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
 910 {
 911         struct enic *enic = netdev_priv(netdev);
 912
 913         spin_lock(&enic->devcmd_lock);
 914         enic_del_vlan(enic, vid);
 915         spin_unlock(&enic->devcmd_lock);
 916 }
 917
 918 /* netif_tx_lock held, BHs disabled */
 919 static void enic_tx_timeout(struct net_device *netdev)
 920 {
 921         struct enic *enic = netdev_priv(netdev);
 922         schedule_work(&enic->reset);
 923 }
 924
 925 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 926 {
 927         struct enic *enic = vnic_dev_priv(rq->vdev);
 928
 929         if (!buf->os_buf)
 930                 return;
 931
 932         pci_unmap_single(enic->pdev, buf->dma_addr,
 933                 buf->len, PCI_DMA_FROMDEVICE);
 934         dev_kfree_skb_any(buf->os_buf);
 935 }
 936
 937 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 938 {
 939         struct enic *enic = vnic_dev_priv(rq->vdev);
 940         struct net_device *netdev = enic->netdev;
 941         struct sk_buff *skb;
 942         unsigned int len = netdev->mtu + ETH_HLEN;
 943         unsigned int os_buf_index = 0;
 944         dma_addr_t dma_addr;
 945
 946         skb = netdev_alloc_skb_ip_align(netdev, len);
 947         if (!skb)
 948                 return -ENOMEM;
 949
 950         dma_addr = pci_map_single(enic->pdev, skb->data,
 951                 len, PCI_DMA_FROMDEVICE);
 952
 953         enic_queue_rq_desc(rq, skb, os_buf_index,
 954                 dma_addr, len);
 955
 956         return 0;
 957 }
 958
 959 static int enic_rq_alloc_buf_a1(struct vnic_rq *rq)
 960 {
 961         struct rq_enet_desc *desc = vnic_rq_next_desc(rq);
 962
 963         if (vnic_rq_posting_soon(rq)) {
 964
 965                 /* SW workaround for A0 HW erratum: if we're just about
 966                  * to write posted_index, insert a dummy desc
 967                  * of type resvd
 968                  */
 969
 970                 rq_enet_desc_enc(desc, 0, RQ_ENET_TYPE_RESV2, 0);
 971                 vnic_rq_post(rq, 0, 0, 0, 0);
 972         } else {
 973                 return enic_rq_alloc_buf(rq);
 974         }
 975
 976         return 0;
 977 }
 978
 979 static int enic_set_rq_alloc_buf(struct enic *enic)
 980 {
 981         enum vnic_dev_hw_version hw_ver;
 982         int err;
 983
 984         err = vnic_dev_hw_version(enic->vdev, &hw_ver);
 985         if (err)
 986                 return err;
 987
 988         switch (hw_ver) {
 989         case VNIC_DEV_HW_VER_A1:
 990                 enic->rq_alloc_buf = enic_rq_alloc_buf_a1;
 991                 break;
 992         case VNIC_DEV_HW_VER_A2:
 993         case VNIC_DEV_HW_VER_UNKNOWN:
 994                 enic->rq_alloc_buf = enic_rq_alloc_buf;
 995                 break;
 996         default:
 997                 return -ENODEV;
 998         }
 999
1000         return 0;
1001 }
1002
1003 static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
1004         void **tcph, u64 *hdr_flags, void *priv)
1005 {
1006         struct cq_enet_rq_desc *cq_desc = priv;
1007         unsigned int ip_len;
1008         struct iphdr *iph;
1009
1010         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1011         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1012         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1013         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1014         u8 packet_error;
1015         u16 q_number, completed_index, bytes_written, vlan, checksum;
1016         u32 rss_hash;
1017
1018         cq_enet_rq_desc_dec(cq_desc,
1019                 &type, &color, &q_number, &completed_index,
1020                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1021                 &csum_not_calc, &rss_hash, &bytes_written,
1022                 &packet_error, &vlan_stripped, &vlan, &checksum,
1023                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1024                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1025                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1026                 &fcs_ok);
1027
1028         if (!(ipv4 && tcp && !ipv4_fragment))
1029                 return -1;
1030
1031         skb_reset_network_header(skb);
1032         iph = ip_hdr(skb);
1033
1034         ip_len = ip_hdrlen(skb);
1035         skb_set_transport_header(skb, ip_len);
1036
1037         /* check if ip header and tcp header are complete */
1038         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
1039                 return -1;
1040
1041         *hdr_flags = LRO_IPV4 | LRO_TCP;
1042         *tcph = tcp_hdr(skb);
1043         *iphdr = iph;
1044
1045         return 0;
1046 }
1047
1048 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1049         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1050         int skipped, void *opaque)
1051 {
1052         struct enic *enic = vnic_dev_priv(rq->vdev);
1053         struct net_device *netdev = enic->netdev;
1054         struct sk_buff *skb;
1055
1056         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1057         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1058         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1059         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1060         u8 packet_error;
1061         u16 q_number, completed_index, bytes_written, vlan, checksum;
1062         u32 rss_hash;
1063
1064         if (skipped)
1065                 return;
1066
1067         skb = buf->os_buf;
1068         prefetch(skb->data - NET_IP_ALIGN);
1069         pci_unmap_single(enic->pdev, buf->dma_addr,
1070                 buf->len, PCI_DMA_FROMDEVICE);
1071
1072         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1073                 &type, &color, &q_number, &completed_index,
1074                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1075                 &csum_not_calc, &rss_hash, &bytes_written,
1076                 &packet_error, &vlan_stripped, &vlan, &checksum,
1077                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1078                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1079                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1080                 &fcs_ok);
1081
1082         if (packet_error) {
1083
1084                 if (!fcs_ok) {
1085                         if (bytes_written > 0)
1086                                 enic->rq_bad_fcs++;
1087                         else if (bytes_written == 0)
1088                                 enic->rq_truncated_pkts++;
1089                 }
1090
1091                 dev_kfree_skb_any(skb);
1092
1093                 return;
1094         }
1095
1096         if (eop && bytes_written > 0) {
1097
1098                 /* Good receive
1099                  */
1100
1101                 skb_put(skb, bytes_written);
1102                 skb->protocol = eth_type_trans(skb, netdev);
1103
1104                 if (enic->csum_rx_enabled && !csum_not_calc) {
1105                         skb->csum = htons(checksum);
1106                         skb->ip_summed = CHECKSUM_COMPLETE;
1107                 }
1108
1109                 skb->dev = netdev;
1110
1111                 if (enic->vlan_group && vlan_stripped) {
1112
1113                         if ((netdev->features & NETIF_F_LRO) && ipv4)
1114                                 lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
1115                                         skb, enic->vlan_group,
1116                                         vlan, cq_desc);
1117                         else
1118                                 vlan_hwaccel_receive_skb(skb,
1119                                         enic->vlan_group, vlan);
1120
1121                 } else {
1122
1123                         if ((netdev->features & NETIF_F_LRO) && ipv4)
1124                                 lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
1125                         else
1126                                 netif_receive_skb(skb);
1127
1128                 }
1129
1130         } else {
1131
1132                 /* Buffer overflow
1133                  */
1134
1135                 dev_kfree_skb_any(skb);
1136         }
1137 }
1138
1139 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1140         u8 type, u16 q_number, u16 completed_index, void *opaque)
1141 {
1142         struct enic *enic = vnic_dev_priv(vdev);
1143
1144         vnic_rq_service(&enic->rq[q_number], cq_desc,
1145                 completed_index, VNIC_RQ_RETURN_DESC,
1146                 enic_rq_indicate_buf, opaque);
1147
1148         return 0;
1149 }
1150
1151 static int enic_poll(struct napi_struct *napi, int budget)
1152 {
1153         struct enic *enic = container_of(napi, struct enic, napi);
1154         struct net_device *netdev = enic->netdev;
1155         unsigned int rq_work_to_do = budget;
1156         unsigned int wq_work_to_do = -1; /* no limit */
1157         unsigned int  work_done, rq_work_done, wq_work_done;
1158         int err;
1159
1160         /* Service RQ (first) and WQ
1161          */
1162
1163         rq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1164                 rq_work_to_do, enic_rq_service, NULL);
1165
1166         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
1167                 wq_work_to_do, enic_wq_service, NULL);
1168
1169         /* Accumulate intr event credits for this polling
1170          * cycle.  An intr event is the completion of a
1171          * a WQ or RQ packet.
1172          */
1173
1174         work_done = rq_work_done + wq_work_done;
1175
1176         if (work_done > 0)
1177                 vnic_intr_return_credits(&enic->intr[ENIC_INTX_WQ_RQ],
1178                         work_done,
1179                         0 /* don't unmask intr */,
1180                         0 /* don't reset intr timer */);
1181
1182         err = vnic_rq_fill(&enic->rq[0], enic->rq_alloc_buf);
1183
1184         /* Buffer allocation failed. Stay in polling
1185          * mode so we can try to fill the ring again.
1186          */
1187
1188         if (err)
1189                 rq_work_done = rq_work_to_do;
1190
1191         if (rq_work_done < rq_work_to_do) {
1192
1193                 /* Some work done, but not enough to stay in polling,
1194                  * flush all LROs and exit polling
1195                  */
1196
1197                 if (netdev->features & NETIF_F_LRO)
1198                         lro_flush_all(&enic->lro_mgr);
1199
1200                 napi_complete(napi);
1201                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
1202         }
1203
1204         return rq_work_done;
1205 }
1206
1207 static int enic_poll_msix(struct napi_struct *napi, int budget)
1208 {
1209         struct enic *enic = container_of(napi, struct enic, napi);
1210         struct net_device *netdev = enic->netdev;
1211         unsigned int work_to_do = budget;
1212         unsigned int work_done;
1213         int err;
1214
1215         /* Service RQ
1216          */
1217
1218         work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1219                 work_to_do, enic_rq_service, NULL);
1220
1221         /* Return intr event credits for this polling
1222          * cycle.  An intr event is the completion of a
1223          * RQ packet.
1224          */
1225
1226         if (work_done > 0)
1227                 vnic_intr_return_credits(&enic->intr[ENIC_MSIX_RQ],
1228                         work_done,
1229                         0 /* don't unmask intr */,
1230                         0 /* don't reset intr timer */);
1231
1232         err = vnic_rq_fill(&enic->rq[0], enic->rq_alloc_buf);
1233
1234         /* Buffer allocation failed. Stay in polling mode
1235          * so we can try to fill the ring again.
1236          */
1237
1238         if (err)
1239                 work_done = work_to_do;
1240
1241         if (work_done < work_to_do) {
1242
1243                 /* Some work done, but not enough to stay in polling,
1244                  * flush all LROs and exit polling
1245                  */
1246
1247                 if (netdev->features & NETIF_F_LRO)
1248                         lro_flush_all(&enic->lro_mgr);
1249
1250                 napi_complete(napi);
1251                 vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
1252         }
1253
1254         return work_done;
1255 }
1256
1257 static void enic_notify_timer(unsigned long data)
1258 {
1259         struct enic *enic = (struct enic *)data;
1260
1261         enic_notify_check(enic);
1262
1263         mod_timer(&enic->notify_timer,
1264                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1265 }
1266
1267 static void enic_free_intr(struct enic *enic)
1268 {
1269         struct net_device *netdev = enic->netdev;
1270         unsigned int i;
1271
1272         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1273         case VNIC_DEV_INTR_MODE_INTX:
1274                 free_irq(enic->pdev->irq, netdev);
1275                 break;
1276         case VNIC_DEV_INTR_MODE_MSI:
1277                 free_irq(enic->pdev->irq, enic);
1278                 break;
1279         case VNIC_DEV_INTR_MODE_MSIX:
1280                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1281                         if (enic->msix[i].requested)
1282                                 free_irq(enic->msix_entry[i].vector,
1283                                         enic->msix[i].devid);
1284                 break;
1285         default:
1286                 break;
1287         }
1288 }
1289
1290 static int enic_request_intr(struct enic *enic)
1291 {
1292         struct net_device *netdev = enic->netdev;
1293         unsigned int i;
1294         int err = 0;
1295
1296         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1297
1298         case VNIC_DEV_INTR_MODE_INTX:
1299
1300                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1301                         IRQF_SHARED, netdev->name, netdev);
1302                 break;
1303
1304         case VNIC_DEV_INTR_MODE_MSI:
1305
1306                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1307                         0, netdev->name, enic);
1308                 break;
1309
1310         case VNIC_DEV_INTR_MODE_MSIX:
1311
1312                 sprintf(enic->msix[ENIC_MSIX_RQ].devname,
1313                         "%.11s-rx-0", netdev->name);
1314                 enic->msix[ENIC_MSIX_RQ].isr = enic_isr_msix_rq;
1315                 enic->msix[ENIC_MSIX_RQ].devid = enic;
1316
1317                 sprintf(enic->msix[ENIC_MSIX_WQ].devname,
1318                         "%.11s-tx-0", netdev->name);
1319                 enic->msix[ENIC_MSIX_WQ].isr = enic_isr_msix_wq;
1320                 enic->msix[ENIC_MSIX_WQ].devid = enic;
1321
1322                 sprintf(enic->msix[ENIC_MSIX_ERR].devname,
1323                         "%.11s-err", netdev->name);
1324                 enic->msix[ENIC_MSIX_ERR].isr = enic_isr_msix_err;
1325                 enic->msix[ENIC_MSIX_ERR].devid = enic;
1326
1327                 sprintf(enic->msix[ENIC_MSIX_NOTIFY].devname,
1328                         "%.11s-notify", netdev->name);
1329                 enic->msix[ENIC_MSIX_NOTIFY].isr = enic_isr_msix_notify;
1330                 enic->msix[ENIC_MSIX_NOTIFY].devid = enic;
1331
1332                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++) {
1333                         err = request_irq(enic->msix_entry[i].vector,
1334                                 enic->msix[i].isr, 0,
1335                                 enic->msix[i].devname,
1336                                 enic->msix[i].devid);
1337                         if (err) {
1338                                 enic_free_intr(enic);
1339                                 break;
1340                         }
1341                         enic->msix[i].requested = 1;
1342                 }
1343
1344                 break;
1345
1346         default:
1347                 break;
1348         }
1349
1350         return err;
1351 }
1352
1353 static void enic_synchronize_irqs(struct enic *enic)
1354 {
1355         unsigned int i;
1356
1357         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1358         case VNIC_DEV_INTR_MODE_INTX:
1359         case VNIC_DEV_INTR_MODE_MSI:
1360                 synchronize_irq(enic->pdev->irq);
1361                 break;
1362         case VNIC_DEV_INTR_MODE_MSIX:
1363                 for (i = 0; i < enic->intr_count; i++)
1364                         synchronize_irq(enic->msix_entry[i].vector);
1365                 break;
1366         default:
1367                 break;
1368         }
1369 }
1370
1371 static int enic_notify_set(struct enic *enic)
1372 {
1373         int err;
1374
1375         spin_lock(&enic->devcmd_lock);
1376         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1377         case VNIC_DEV_INTR_MODE_INTX:
1378                 err = vnic_dev_notify_set(enic->vdev, ENIC_INTX_NOTIFY);
1379                 break;
1380         case VNIC_DEV_INTR_MODE_MSIX:
1381                 err = vnic_dev_notify_set(enic->vdev, ENIC_MSIX_NOTIFY);
1382                 break;
1383         default:
1384                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1385                 break;
1386         }
1387         spin_unlock(&enic->devcmd_lock);
1388
1389         return err;
1390 }
1391
1392 static void enic_notify_timer_start(struct enic *enic)
1393 {
1394         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1395         case VNIC_DEV_INTR_MODE_MSI:
1396                 mod_timer(&enic->notify_timer, jiffies);
1397                 break;
1398         default:
1399                 /* Using intr for notification for INTx/MSI-X */
1400                 break;
1401         };
1402 }
1403
1404 /* rtnl lock is held, process context */
1405 static int enic_open(struct net_device *netdev)
1406 {
1407         struct enic *enic = netdev_priv(netdev);
1408         unsigned int i;
1409         int err;
1410
1411         err = enic_request_intr(enic);
1412         if (err) {
1413                 printk(KERN_ERR PFX "%s: Unable to request irq.\n",
1414                         netdev->name);
1415                 return err;
1416         }
1417
1418         err = enic_notify_set(enic);
1419         if (err) {
1420                 printk(KERN_ERR PFX
1421                         "%s: Failed to alloc notify buffer, aborting.\n",
1422                         netdev->name);
1423                 goto err_out_free_intr;
1424         }
1425
1426         for (i = 0; i < enic->rq_count; i++) {
1427                 vnic_rq_fill(&enic->rq[i], enic->rq_alloc_buf);
1428                 /* Need at least one buffer on ring to get going */
1429                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1430                         printk(KERN_ERR PFX
1431                                 "%s: Unable to alloc receive buffers.\n",
1432                                 netdev->name);
1433                         err = -ENOMEM;
1434                         goto err_out_notify_unset;
1435                 }
1436         }
1437
1438         for (i = 0; i < enic->wq_count; i++)
1439                 vnic_wq_enable(&enic->wq[i]);
1440         for (i = 0; i < enic->rq_count; i++)
1441                 vnic_rq_enable(&enic->rq[i]);
1442
1443         spin_lock(&enic->devcmd_lock);
1444         enic_add_station_addr(enic);
1445         spin_unlock(&enic->devcmd_lock);
1446         enic_set_multicast_list(netdev);
1447
1448         netif_wake_queue(netdev);
1449         napi_enable(&enic->napi);
1450         spin_lock(&enic->devcmd_lock);
1451         vnic_dev_enable(enic->vdev);
1452         spin_unlock(&enic->devcmd_lock);
1453
1454         for (i = 0; i < enic->intr_count; i++)
1455                 vnic_intr_unmask(&enic->intr[i]);
1456
1457         enic_notify_timer_start(enic);
1458
1459         return 0;
1460
1461 err_out_notify_unset:
1462         spin_lock(&enic->devcmd_lock);
1463         vnic_dev_notify_unset(enic->vdev);
1464         spin_unlock(&enic->devcmd_lock);
1465 err_out_free_intr:
1466         enic_free_intr(enic);
1467
1468         return err;
1469 }
1470
1471 /* rtnl lock is held, process context */
1472 static int enic_stop(struct net_device *netdev)
1473 {
1474         struct enic *enic = netdev_priv(netdev);
1475         unsigned int i;
1476         int err;
1477
1478         for (i = 0; i < enic->intr_count; i++)
1479                 vnic_intr_mask(&enic->intr[i]);
1480
1481         enic_synchronize_irqs(enic);
1482
1483         del_timer_sync(&enic->notify_timer);
1484
1485         spin_lock(&enic->devcmd_lock);
1486         vnic_dev_disable(enic->vdev);
1487         spin_unlock(&enic->devcmd_lock);
1488         napi_disable(&enic->napi);
1489         netif_carrier_off(netdev);
1490         netif_tx_disable(netdev);
1491
1492         for (i = 0; i < enic->wq_count; i++) {
1493                 err = vnic_wq_disable(&enic->wq[i]);
1494                 if (err)
1495                         return err;
1496         }
1497         for (i = 0; i < enic->rq_count; i++) {
1498                 err = vnic_rq_disable(&enic->rq[i]);
1499                 if (err)
1500                         return err;
1501         }
1502
1503         spin_lock(&enic->devcmd_lock);
1504         vnic_dev_notify_unset(enic->vdev);
1505         spin_unlock(&enic->devcmd_lock);
1506         enic_free_intr(enic);
1507
1508         for (i = 0; i < enic->wq_count; i++)
1509                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1510         for (i = 0; i < enic->rq_count; i++)
1511                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1512         for (i = 0; i < enic->cq_count; i++)
1513                 vnic_cq_clean(&enic->cq[i]);
1514         for (i = 0; i < enic->intr_count; i++)
1515                 vnic_intr_clean(&enic->intr[i]);
1516
1517         return 0;
1518 }
1519
1520 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1521 {
1522         struct enic *enic = netdev_priv(netdev);
1523         int running = netif_running(netdev);
1524
1525         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1526                 return -EINVAL;
1527
1528         if (running)
1529                 enic_stop(netdev);
1530
1531         netdev->mtu = new_mtu;
1532
1533         if (netdev->mtu > enic->port_mtu)
1534                 printk(KERN_WARNING PFX
1535                         "%s: interface MTU (%d) set higher "
1536                         "than port MTU (%d)\n",
1537                         netdev->name, netdev->mtu, enic->port_mtu);
1538
1539         if (running)
1540                 enic_open(netdev);
1541
1542         return 0;
1543 }
1544
1545 #ifdef CONFIG_NET_POLL_CONTROLLER
1546 static void enic_poll_controller(struct net_device *netdev)
1547 {
1548         struct enic *enic = netdev_priv(netdev);
1549         struct vnic_dev *vdev = enic->vdev;
1550
1551         switch (vnic_dev_get_intr_mode(vdev)) {
1552         case VNIC_DEV_INTR_MODE_MSIX:
1553                 enic_isr_msix_rq(enic->pdev->irq, enic);
1554                 enic_isr_msix_wq(enic->pdev->irq, enic);
1555                 break;
1556         case VNIC_DEV_INTR_MODE_MSI:
1557                 enic_isr_msi(enic->pdev->irq, enic);
1558                 break;
1559         case VNIC_DEV_INTR_MODE_INTX:
1560                 enic_isr_legacy(enic->pdev->irq, netdev);
1561                 break;
1562         default:
1563                 break;
1564         }
1565 }
1566 #endif
1567
1568 static int enic_dev_wait(struct vnic_dev *vdev,
1569         int (*start)(struct vnic_dev *, int),
1570         int (*finished)(struct vnic_dev *, int *),
1571         int arg)
1572 {
1573         unsigned long time;
1574         int done;
1575         int err;
1576
1577         BUG_ON(in_interrupt());
1578
1579         err = start(vdev, arg);
1580         if (err)
1581                 return err;
1582
1583         /* Wait for func to complete...2 seconds max
1584          */
1585
1586         time = jiffies + (HZ * 2);
1587         do {
1588
1589                 err = finished(vdev, &done);
1590                 if (err)
1591                         return err;
1592
1593                 if (done)
1594                         return 0;
1595
1596                 schedule_timeout_uninterruptible(HZ / 10);
1597
1598         } while (time_after(time, jiffies));
1599
1600         return -ETIMEDOUT;
1601 }
1602
1603 static int enic_dev_open(struct enic *enic)
1604 {
1605         int err;
1606
1607         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1608                 vnic_dev_open_done, 0);
1609         if (err)
1610                 printk(KERN_ERR PFX
1611                         "vNIC device open failed, err %d.\n", err);
1612
1613         return err;
1614 }
1615
1616 static int enic_dev_soft_reset(struct enic *enic)
1617 {
1618         int err;
1619
1620         err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
1621                 vnic_dev_soft_reset_done, 0);
1622         if (err)
1623                 printk(KERN_ERR PFX
1624                         "vNIC soft reset failed, err %d.\n", err);
1625
1626         return err;
1627 }
1628
1629 static int enic_set_niccfg(struct enic *enic)
1630 {
1631         const u8 rss_default_cpu = 0;
1632         const u8 rss_hash_type = 0;
1633         const u8 rss_hash_bits = 0;
1634         const u8 rss_base_cpu = 0;
1635         const u8 rss_enable = 0;
1636         const u8 tso_ipid_split_en = 0;
1637         const u8 ig_vlan_strip_en = 1;
1638
1639         /* Enable VLAN tag stripping.  RSS not enabled (yet).
1640          */
1641
1642         return enic_set_nic_cfg(enic,
1643                 rss_default_cpu, rss_hash_type,
1644                 rss_hash_bits, rss_base_cpu,
1645                 rss_enable, tso_ipid_split_en,
1646                 ig_vlan_strip_en);
1647 }
1648
1649 static void enic_reset(struct work_struct *work)
1650 {
1651         struct enic *enic = container_of(work, struct enic, reset);
1652
1653         if (!netif_running(enic->netdev))
1654                 return;
1655
1656         rtnl_lock();
1657
1658         spin_lock(&enic->devcmd_lock);
1659         vnic_dev_hang_notify(enic->vdev);
1660         spin_unlock(&enic->devcmd_lock);
1661
1662         enic_stop(enic->netdev);
1663         enic_dev_soft_reset(enic);
1664         vnic_dev_init(enic->vdev, 0);
1665         enic_reset_mcaddrs(enic);
1666         enic_init_vnic_resources(enic);
1667         enic_set_niccfg(enic);
1668         enic_open(enic->netdev);
1669
1670         rtnl_unlock();
1671 }
1672
1673 static int enic_set_intr_mode(struct enic *enic)
1674 {
1675         unsigned int n = 1;
1676         unsigned int m = 1;
1677         unsigned int i;
1678
1679         /* Set interrupt mode (INTx, MSI, MSI-X) depending
1680          * system capabilities.
1681          *
1682          * Try MSI-X first
1683          *
1684          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1685          * (the second to last INTR is used for WQ/RQ errors)
1686          * (the last INTR is used for notifications)
1687          */
1688
1689         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1690         for (i = 0; i < n + m + 2; i++)
1691                 enic->msix_entry[i].entry = i;
1692
1693         if (enic->config.intr_mode < 1 &&
1694             enic->rq_count >= n &&
1695             enic->wq_count >= m &&
1696             enic->cq_count >= n + m &&
1697             enic->intr_count >= n + m + 2 &&
1698             !pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {
1699
1700                 enic->rq_count = n;
1701                 enic->wq_count = m;
1702                 enic->cq_count = n + m;
1703                 enic->intr_count = n + m + 2;
1704
1705                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSIX);
1706
1707                 return 0;
1708         }
1709
1710         /* Next try MSI
1711          *
1712          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
1713          */
1714
1715         if (enic->config.intr_mode < 2 &&
1716             enic->rq_count >= 1 &&
1717             enic->wq_count >= 1 &&
1718             enic->cq_count >= 2 &&
1719             enic->intr_count >= 1 &&
1720             !pci_enable_msi(enic->pdev)) {
1721
1722                 enic->rq_count = 1;
1723                 enic->wq_count = 1;
1724                 enic->cq_count = 2;
1725                 enic->intr_count = 1;
1726
1727                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
1728
1729                 return 0;
1730         }
1731
1732         /* Next try INTx
1733          *
1734          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
1735          * (the first INTR is used for WQ/RQ)
1736          * (the second INTR is used for WQ/RQ errors)
1737          * (the last INTR is used for notifications)
1738          */
1739
1740         if (enic->config.intr_mode < 3 &&
1741             enic->rq_count >= 1 &&
1742             enic->wq_count >= 1 &&
1743             enic->cq_count >= 2 &&
1744             enic->intr_count >= 3) {
1745
1746                 enic->rq_count = 1;
1747                 enic->wq_count = 1;
1748                 enic->cq_count = 2;
1749                 enic->intr_count = 3;
1750
1751                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
1752
1753                 return 0;
1754         }
1755
1756         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1757
1758         return -EINVAL;
1759 }
1760
1761 static void enic_clear_intr_mode(struct enic *enic)
1762 {
1763         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1764         case VNIC_DEV_INTR_MODE_MSIX:
1765                 pci_disable_msix(enic->pdev);
1766                 break;
1767         case VNIC_DEV_INTR_MODE_MSI:
1768                 pci_disable_msi(enic->pdev);
1769                 break;
1770         default:
1771                 break;
1772         }
1773
1774         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1775 }
1776
1777 static const struct net_device_ops enic_netdev_ops = {
1778         .ndo_open               = enic_open,
1779         .ndo_stop               = enic_stop,
1780         .ndo_start_xmit         = enic_hard_start_xmit,
1781         .ndo_get_stats          = enic_get_stats,
1782         .ndo_validate_addr      = eth_validate_addr,
1783         .ndo_set_mac_address    = eth_mac_addr,
1784         .ndo_set_multicast_list = enic_set_multicast_list,
1785         .ndo_change_mtu         = enic_change_mtu,
1786         .ndo_vlan_rx_register   = enic_vlan_rx_register,
1787         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
1788         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
1789         .ndo_tx_timeout         = enic_tx_timeout,
1790 #ifdef CONFIG_NET_POLL_CONTROLLER
1791         .ndo_poll_controller    = enic_poll_controller,
1792 #endif
1793 };
1794
1795 void enic_dev_deinit(struct enic *enic)
1796 {
1797         netif_napi_del(&enic->napi);
1798         enic_free_vnic_resources(enic);
1799         enic_clear_intr_mode(enic);
1800 }
1801
1802 int enic_dev_init(struct enic *enic)
1803 {
1804         struct net_device *netdev = enic->netdev;
1805         int err;
1806
1807         /* Get vNIC configuration
1808          */
1809
1810         err = enic_get_vnic_config(enic);
1811         if (err) {
1812                 printk(KERN_ERR PFX
1813                         "Get vNIC configuration failed, aborting.\n");
1814                 return err;
1815         }
1816
1817         /* Get available resource counts
1818          */
1819
1820         enic_get_res_counts(enic);
1821
1822         /* Set interrupt mode based on resource counts and system
1823          * capabilities
1824          */
1825
1826         err = enic_set_intr_mode(enic);
1827         if (err) {
1828                 printk(KERN_ERR PFX
1829                         "Failed to set intr mode based on resource "
1830                         "counts and system capabilities, aborting.\n");
1831                 return err;
1832         }
1833
1834         /* Allocate and configure vNIC resources
1835          */
1836
1837         err = enic_alloc_vnic_resources(enic);
1838         if (err) {
1839                 printk(KERN_ERR PFX
1840                         "Failed to alloc vNIC resources, aborting.\n");
1841                 goto err_out_free_vnic_resources;
1842         }
1843
1844         enic_init_vnic_resources(enic);
1845
1846         err = enic_set_rq_alloc_buf(enic);
1847         if (err) {
1848                 printk(KERN_ERR PFX
1849                         "Failed to set RQ buffer allocator, aborting.\n");
1850                 goto err_out_free_vnic_resources;
1851         }
1852
1853         err = enic_set_niccfg(enic);
1854         if (err) {
1855                 printk(KERN_ERR PFX
1856                         "Failed to config nic, aborting.\n");
1857                 goto err_out_free_vnic_resources;
1858         }
1859
1860         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1861         default:
1862                 netif_napi_add(netdev, &enic->napi, enic_poll, 64);
1863                 break;
1864         case VNIC_DEV_INTR_MODE_MSIX:
1865                 netif_napi_add(netdev, &enic->napi, enic_poll_msix, 64);
1866                 break;
1867         }
1868
1869         return 0;
1870
1871 err_out_free_vnic_resources:
1872         enic_clear_intr_mode(enic);
1873         enic_free_vnic_resources(enic);
1874
1875         return err;
1876 }
1877
1878 static void enic_iounmap(struct enic *enic)
1879 {
1880         unsigned int i;
1881
1882         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
1883                 if (enic->bar[i].vaddr)
1884                         iounmap(enic->bar[i].vaddr);
1885 }
1886
1887 static int __devinit enic_probe(struct pci_dev *pdev,
1888         const struct pci_device_id *ent)
1889 {
1890         struct net_device *netdev;
1891         struct enic *enic;
1892         int using_dac = 0;
1893         unsigned int i;
1894         int err;
1895
1896         /* Allocate net device structure and initialize.  Private
1897          * instance data is initialized to zero.
1898          */
1899
1900         netdev = alloc_etherdev(sizeof(struct enic));
1901         if (!netdev) {
1902                 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1903                 return -ENOMEM;
1904         }
1905
1906         pci_set_drvdata(pdev, netdev);
1907
1908         SET_NETDEV_DEV(netdev, &pdev->dev);
1909
1910         enic = netdev_priv(netdev);
1911         enic->netdev = netdev;
1912         enic->pdev = pdev;
1913
1914         /* Setup PCI resources
1915          */
1916
1917         err = pci_enable_device(pdev);
1918         if (err) {
1919                 printk(KERN_ERR PFX
1920                         "Cannot enable PCI device, aborting.\n");
1921                 goto err_out_free_netdev;
1922         }
1923
1924         err = pci_request_regions(pdev, DRV_NAME);
1925         if (err) {
1926                 printk(KERN_ERR PFX
1927                         "Cannot request PCI regions, aborting.\n");
1928                 goto err_out_disable_device;
1929         }
1930
1931         pci_set_master(pdev);
1932
1933         /* Query PCI controller on system for DMA addressing
1934          * limitation for the device.  Try 40-bit first, and
1935          * fail to 32-bit.
1936          */
1937
1938         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40));
1939         if (err) {
1940                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1941                 if (err) {
1942                         printk(KERN_ERR PFX
1943                                 "No usable DMA configuration, aborting.\n");
1944                         goto err_out_release_regions;
1945                 }
1946                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1947                 if (err) {
1948                         printk(KERN_ERR PFX
1949                                 "Unable to obtain 32-bit DMA "
1950                                 "for consistent allocations, aborting.\n");
1951                         goto err_out_release_regions;
1952                 }
1953         } else {
1954                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40));
1955                 if (err) {
1956                         printk(KERN_ERR PFX
1957                                 "Unable to obtain 40-bit DMA "
1958                                 "for consistent allocations, aborting.\n");
1959                         goto err_out_release_regions;
1960                 }
1961                 using_dac = 1;
1962         }
1963
1964         /* Map vNIC resources from BAR0-5
1965          */
1966
1967         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
1968                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
1969                         continue;
1970                 enic->bar[i].len = pci_resource_len(pdev, i);
1971                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
1972                 if (!enic->bar[i].vaddr) {
1973                         printk(KERN_ERR PFX
1974                                 "Cannot memory-map BAR %d, aborting.\n", i);
1975                         err = -ENODEV;
1976                         goto err_out_iounmap;
1977                 }
1978                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
1979         }
1980
1981         /* Register vNIC device
1982          */
1983
1984         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
1985                 ARRAY_SIZE(enic->bar));
1986         if (!enic->vdev) {
1987                 printk(KERN_ERR PFX
1988                         "vNIC registration failed, aborting.\n");
1989                 err = -ENODEV;
1990                 goto err_out_iounmap;
1991         }
1992
1993         /* Issue device open to get device in known state
1994          */
1995
1996         err = enic_dev_open(enic);
1997         if (err) {
1998                 printk(KERN_ERR PFX
1999                         "vNIC dev open failed, aborting.\n");
2000                 goto err_out_vnic_unregister;
2001         }
2002
2003         /* Issue device init to initialize the vnic-to-switch link.
2004          * We'll start with carrier off and wait for link UP
2005          * notification later to turn on carrier.  We don't need
2006          * to wait here for the vnic-to-switch link initialization
2007          * to complete; link UP notification is the indication that
2008          * the process is complete.
2009          */
2010
2011         netif_carrier_off(netdev);
2012
2013         err = vnic_dev_init(enic->vdev, 0);
2014         if (err) {
2015                 printk(KERN_ERR PFX
2016                         "vNIC dev init failed, aborting.\n");
2017                 goto err_out_dev_close;
2018         }
2019
2020         err = enic_dev_init(enic);
2021         if (err) {
2022                 printk(KERN_ERR PFX
2023                         "Device initialization failed, aborting.\n");
2024                 goto err_out_dev_close;
2025         }
2026
2027         /* Setup notification timer, HW reset task, and locks
2028          */
2029
2030         init_timer(&enic->notify_timer);
2031         enic->notify_timer.function = enic_notify_timer;
2032         enic->notify_timer.data = (unsigned long)enic;
2033
2034         INIT_WORK(&enic->reset, enic_reset);
2035
2036         for (i = 0; i < enic->wq_count; i++)
2037                 spin_lock_init(&enic->wq_lock[i]);
2038
2039         spin_lock_init(&enic->devcmd_lock);
2040
2041         /* Register net device
2042          */
2043
2044         enic->port_mtu = enic->config.mtu;
2045         (void)enic_change_mtu(netdev, enic->port_mtu);
2046
2047         err = enic_set_mac_addr(netdev, enic->mac_addr);
2048         if (err) {
2049                 printk(KERN_ERR PFX
2050                         "Invalid MAC address, aborting.\n");
2051                 goto err_out_dev_deinit;
2052         }
2053
2054         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2055         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2056
2057         netdev->netdev_ops = &enic_netdev_ops;
2058         netdev->watchdog_timeo = 2 * HZ;
2059         netdev->ethtool_ops = &enic_ethtool_ops;
2060
2061         netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
2062         if (ENIC_SETTING(enic, TXCSUM))
2063                 netdev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2064         if (ENIC_SETTING(enic, TSO))
2065                 netdev->features |= NETIF_F_TSO |
2066                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2067         if (ENIC_SETTING(enic, LRO))
2068                 netdev->features |= NETIF_F_LRO;
2069         if (using_dac)
2070                 netdev->features |= NETIF_F_HIGHDMA;
2071
2072         enic->csum_rx_enabled = ENIC_SETTING(enic, RXCSUM);
2073
2074         enic->lro_mgr.max_aggr = ENIC_LRO_MAX_AGGR;
2075         enic->lro_mgr.max_desc = ENIC_LRO_MAX_DESC;
2076         enic->lro_mgr.lro_arr = enic->lro_desc;
2077         enic->lro_mgr.get_skb_header = enic_get_skb_header;
2078         enic->lro_mgr.features  = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
2079         enic->lro_mgr.dev = netdev;
2080         enic->lro_mgr.ip_summed = CHECKSUM_COMPLETE;
2081         enic->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
2082
2083         err = register_netdev(netdev);
2084         if (err) {
2085                 printk(KERN_ERR PFX
2086                         "Cannot register net device, aborting.\n");
2087                 goto err_out_dev_deinit;
2088         }
2089
2090         return 0;
2091
2092 err_out_dev_deinit:
2093         enic_dev_deinit(enic);
2094 err_out_dev_close:
2095         vnic_dev_close(enic->vdev);
2096 err_out_vnic_unregister:
2097         vnic_dev_unregister(enic->vdev);
2098 err_out_iounmap:
2099         enic_iounmap(enic);
2100 err_out_release_regions:
2101         pci_release_regions(pdev);
2102 err_out_disable_device:
2103         pci_disable_device(pdev);
2104 err_out_free_netdev:
2105         pci_set_drvdata(pdev, NULL);
2106         free_netdev(netdev);
2107
2108         return err;
2109 }
2110
2111 static void __devexit enic_remove(struct pci_dev *pdev)
2112 {
2113         struct net_device *netdev = pci_get_drvdata(pdev);
2114
2115         if (netdev) {
2116                 struct enic *enic = netdev_priv(netdev);
2117
2118                 flush_scheduled_work();
2119                 unregister_netdev(netdev);
2120                 enic_dev_deinit(enic);
2121                 vnic_dev_close(enic->vdev);
2122                 vnic_dev_unregister(enic->vdev);
2123                 enic_iounmap(enic);
2124                 pci_release_regions(pdev);
2125                 pci_disable_device(pdev);
2126                 pci_set_drvdata(pdev, NULL);
2127                 free_netdev(netdev);
2128         }
2129 }
2130
2131 static struct pci_driver enic_driver = {
2132         .name = DRV_NAME,
2133         .id_table = enic_id_table,
2134         .probe = enic_probe,
2135         .remove = __devexit_p(enic_remove),
2136 };
2137
2138 static int __init enic_init_module(void)
2139 {
2140         printk(KERN_INFO PFX "%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2141
2142         return pci_register_driver(&enic_driver);
2143 }
2144
2145 static void __exit enic_cleanup_module(void)
2146 {
2147         pci_unregister_driver(&enic_driver);
2148 }
2149
2150 module_init(enic_init_module);
2151 module_exit(enic_cleanup_module);