drivers/net/ethernet/cisco/enic/enic_main.c

   1 /*
   2  * Copyright 2008-2010 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/interrupt.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/pci.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if.h>
  32 #include <linux/if_ether.h>
  33 #include <linux/if_vlan.h>
  34 #include <linux/in.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/tcp.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/prefetch.h>
  40 #include <net/ip6_checksum.h>
  41 #include <linux/ktime.h>
  42
  43 #include "cq_enet_desc.h"
  44 #include "vnic_dev.h"
  45 #include "vnic_intr.h"
  46 #include "vnic_stats.h"
  47 #include "vnic_vic.h"
  48 #include "enic_res.h"
  49 #include "enic.h"
  50 #include "enic_dev.h"
  51 #include "enic_pp.h"
  52
  53 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  54 #define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  55 #define MAX_TSO                         (1 << 16)
  56 #define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  57
  58 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  59 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
  60 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
  61
  62 /* Supported devices */
  63 static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
  64         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  65         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
  66         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
  67         { 0, }  /* end of table */
  68 };
  69
  70 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  71 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  72 MODULE_LICENSE("GPL");
  73 MODULE_VERSION(DRV_VERSION);
  74 MODULE_DEVICE_TABLE(pci, enic_id_table);
  75
  76 #define ENIC_LARGE_PKT_THRESHOLD                1000
  77 #define ENIC_MAX_COALESCE_TIMERS                10
  78 /*  Interrupt moderation table, which will be used to decide the
  79  *  coalescing timer values
  80  *  {rx_rate in Mbps, mapping percentage of the range}
  81  */
  82 struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
  83         {4000,  0},
  84         {4400, 10},
  85         {5060, 20},
  86         {5230, 30},
  87         {5540, 40},
  88         {5820, 50},
  89         {6120, 60},
  90         {6435, 70},
  91         {6745, 80},
  92         {7000, 90},
  93         {0xFFFFFFFF, 100}
  94 };
  95
  96 /* This table helps the driver to pick different ranges for rx coalescing
  97  * timer depending on the link speed.
  98  */
  99 struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
 100         {0,  0}, /* 0  - 4  Gbps */
 101         {0,  3}, /* 4  - 10 Gbps */
 102         {3,  6}, /* 10 - 40 Gbps */
 103 };
 104
 105 int enic_is_dynamic(struct enic *enic)
 106 {
 107         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 108 }
 109
 110 int enic_sriov_enabled(struct enic *enic)
 111 {
 112         return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 113 }
 114
 115 static int enic_is_sriov_vf(struct enic *enic)
 116 {
 117         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 118 }
 119
 120 int enic_is_valid_vf(struct enic *enic, int vf)
 121 {
 122 #ifdef CONFIG_PCI_IOV
 123         return vf >= 0 && vf < enic->num_vfs;
 124 #else
 125         return 0;
 126 #endif
 127 }
 128
 129 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 130 {
 131         struct enic *enic = vnic_dev_priv(wq->vdev);
 132
 133         if (buf->sop)
 134                 pci_unmap_single(enic->pdev, buf->dma_addr,
 135                         buf->len, PCI_DMA_TODEVICE);
 136         else
 137                 pci_unmap_page(enic->pdev, buf->dma_addr,
 138                         buf->len, PCI_DMA_TODEVICE);
 139
 140         if (buf->os_buf)
 141                 dev_kfree_skb_any(buf->os_buf);
 142 }
 143
 144 static void enic_wq_free_buf(struct vnic_wq *wq,
 145         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 146 {
 147         enic_free_wq_buf(wq, buf);
 148 }
 149
 150 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 151         u8 type, u16 q_number, u16 completed_index, void *opaque)
 152 {
 153         struct enic *enic = vnic_dev_priv(vdev);
 154
 155         spin_lock(&enic->wq_lock[q_number]);
 156
 157         vnic_wq_service(&enic->wq[q_number], cq_desc,
 158                 completed_index, enic_wq_free_buf,
 159                 opaque);
 160
 161         if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 162             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 163             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 164                 netif_wake_subqueue(enic->netdev, q_number);
 165
 166         spin_unlock(&enic->wq_lock[q_number]);
 167
 168         return 0;
 169 }
 170
 171 static void enic_log_q_error(struct enic *enic)
 172 {
 173         unsigned int i;
 174         u32 error_status;
 175
 176         for (i = 0; i < enic->wq_count; i++) {
 177                 error_status = vnic_wq_error_status(&enic->wq[i]);
 178                 if (error_status)
 179                         netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 180                                 i, error_status);
 181         }
 182
 183         for (i = 0; i < enic->rq_count; i++) {
 184                 error_status = vnic_rq_error_status(&enic->rq[i]);
 185                 if (error_status)
 186                         netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 187                                 i, error_status);
 188         }
 189 }
 190
 191 static void enic_msglvl_check(struct enic *enic)
 192 {
 193         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 194
 195         if (msg_enable != enic->msg_enable) {
 196                 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 197                         enic->msg_enable, msg_enable);
 198                 enic->msg_enable = msg_enable;
 199         }
 200 }
 201
 202 static void enic_mtu_check(struct enic *enic)
 203 {
 204         u32 mtu = vnic_dev_mtu(enic->vdev);
 205         struct net_device *netdev = enic->netdev;
 206
 207         if (mtu && mtu != enic->port_mtu) {
 208                 enic->port_mtu = mtu;
 209                 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 210                         mtu = max_t(int, ENIC_MIN_MTU,
 211                                 min_t(int, ENIC_MAX_MTU, mtu));
 212                         if (mtu != netdev->mtu)
 213                                 schedule_work(&enic->change_mtu_work);
 214                 } else {
 215                         if (mtu < netdev->mtu)
 216                                 netdev_warn(netdev,
 217                                         "interface MTU (%d) set higher "
 218                                         "than switch port MTU (%d)\n",
 219                                         netdev->mtu, mtu);
 220                 }
 221         }
 222 }
 223
 224 static void enic_link_check(struct enic *enic)
 225 {
 226         int link_status = vnic_dev_link_status(enic->vdev);
 227         int carrier_ok = netif_carrier_ok(enic->netdev);
 228
 229         if (link_status && !carrier_ok) {
 230                 netdev_info(enic->netdev, "Link UP\n");
 231                 netif_carrier_on(enic->netdev);
 232         } else if (!link_status && carrier_ok) {
 233                 netdev_info(enic->netdev, "Link DOWN\n");
 234                 netif_carrier_off(enic->netdev);
 235         }
 236 }
 237
 238 static void enic_notify_check(struct enic *enic)
 239 {
 240         enic_msglvl_check(enic);
 241         enic_mtu_check(enic);
 242         enic_link_check(enic);
 243 }
 244
 245 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 246
 247 static irqreturn_t enic_isr_legacy(int irq, void *data)
 248 {
 249         struct net_device *netdev = data;
 250         struct enic *enic = netdev_priv(netdev);
 251         unsigned int io_intr = enic_legacy_io_intr();
 252         unsigned int err_intr = enic_legacy_err_intr();
 253         unsigned int notify_intr = enic_legacy_notify_intr();
 254         u32 pba;
 255
 256         vnic_intr_mask(&enic->intr[io_intr]);
 257
 258         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 259         if (!pba) {
 260                 vnic_intr_unmask(&enic->intr[io_intr]);
 261                 return IRQ_NONE;        /* not our interrupt */
 262         }
 263
 264         if (ENIC_TEST_INTR(pba, notify_intr)) {
 265                 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 266                 enic_notify_check(enic);
 267         }
 268
 269         if (ENIC_TEST_INTR(pba, err_intr)) {
 270                 vnic_intr_return_all_credits(&enic->intr[err_intr]);
 271                 enic_log_q_error(enic);
 272                 /* schedule recovery from WQ/RQ error */
 273                 schedule_work(&enic->reset);
 274                 return IRQ_HANDLED;
 275         }
 276
 277         if (ENIC_TEST_INTR(pba, io_intr)) {
 278                 if (napi_schedule_prep(&enic->napi[0]))
 279                         __napi_schedule(&enic->napi[0]);
 280         } else {
 281                 vnic_intr_unmask(&enic->intr[io_intr]);
 282         }
 283
 284         return IRQ_HANDLED;
 285 }
 286
 287 static irqreturn_t enic_isr_msi(int irq, void *data)
 288 {
 289         struct enic *enic = data;
 290
 291         /* With MSI, there is no sharing of interrupts, so this is
 292          * our interrupt and there is no need to ack it.  The device
 293          * is not providing per-vector masking, so the OS will not
 294          * write to PCI config space to mask/unmask the interrupt.
 295          * We're using mask_on_assertion for MSI, so the device
 296          * automatically masks the interrupt when the interrupt is
 297          * generated.  Later, when exiting polling, the interrupt
 298          * will be unmasked (see enic_poll).
 299          *
 300          * Also, the device uses the same PCIe Traffic Class (TC)
 301          * for Memory Write data and MSI, so there are no ordering
 302          * issues; the MSI will always arrive at the Root Complex
 303          * _after_ corresponding Memory Writes (i.e. descriptor
 304          * writes).
 305          */
 306
 307         napi_schedule(&enic->napi[0]);
 308
 309         return IRQ_HANDLED;
 310 }
 311
 312 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
 313 {
 314         struct napi_struct *napi = data;
 315
 316         /* schedule NAPI polling for RQ cleanup */
 317         napi_schedule(napi);
 318
 319         return IRQ_HANDLED;
 320 }
 321
 322 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
 323 {
 324         struct enic *enic = data;
 325         unsigned int cq;
 326         unsigned int intr;
 327         unsigned int wq_work_to_do = -1; /* no limit */
 328         unsigned int wq_work_done;
 329         unsigned int wq_irq;
 330
 331         wq_irq = (u32)irq - enic->msix_entry[enic_msix_wq_intr(enic, 0)].vector;
 332         cq = enic_cq_wq(enic, wq_irq);
 333         intr = enic_msix_wq_intr(enic, wq_irq);
 334
 335         wq_work_done = vnic_cq_service(&enic->cq[cq],
 336                 wq_work_to_do, enic_wq_service, NULL);
 337
 338         vnic_intr_return_credits(&enic->intr[intr],
 339                 wq_work_done,
 340                 1 /* unmask intr */,
 341                 1 /* reset intr timer */);
 342
 343         return IRQ_HANDLED;
 344 }
 345
 346 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 347 {
 348         struct enic *enic = data;
 349         unsigned int intr = enic_msix_err_intr(enic);
 350
 351         vnic_intr_return_all_credits(&enic->intr[intr]);
 352
 353         enic_log_q_error(enic);
 354
 355         /* schedule recovery from WQ/RQ error */
 356         schedule_work(&enic->reset);
 357
 358         return IRQ_HANDLED;
 359 }
 360
 361 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 362 {
 363         struct enic *enic = data;
 364         unsigned int intr = enic_msix_notify_intr(enic);
 365
 366         vnic_intr_return_all_credits(&enic->intr[intr]);
 367         enic_notify_check(enic);
 368
 369         return IRQ_HANDLED;
 370 }
 371
 372 static inline void enic_queue_wq_skb_cont(struct enic *enic,
 373         struct vnic_wq *wq, struct sk_buff *skb,
 374         unsigned int len_left, int loopback)
 375 {
 376         const skb_frag_t *frag;
 377
 378         /* Queue additional data fragments */
 379         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 380                 len_left -= skb_frag_size(frag);
 381                 enic_queue_wq_desc_cont(wq, skb,
 382                         skb_frag_dma_map(&enic->pdev->dev,
 383                                          frag, 0, skb_frag_size(frag),
 384                                          DMA_TO_DEVICE),
 385                         skb_frag_size(frag),
 386                         (len_left == 0),        /* EOP? */
 387                         loopback);
 388         }
 389 }
 390
 391 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
 392         struct vnic_wq *wq, struct sk_buff *skb,
 393         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 394 {
 395         unsigned int head_len = skb_headlen(skb);
 396         unsigned int len_left = skb->len - head_len;
 397         int eop = (len_left == 0);
 398
 399         /* Queue the main skb fragment. The fragments are no larger
 400          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 401          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 402          * per fragment is queued.
 403          */
 404         enic_queue_wq_desc(wq, skb,
 405                 pci_map_single(enic->pdev, skb->data,
 406                         head_len, PCI_DMA_TODEVICE),
 407                 head_len,
 408                 vlan_tag_insert, vlan_tag,
 409                 eop, loopback);
 410
 411         if (!eop)
 412                 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 413 }
 414
 415 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
 416         struct vnic_wq *wq, struct sk_buff *skb,
 417         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 418 {
 419         unsigned int head_len = skb_headlen(skb);
 420         unsigned int len_left = skb->len - head_len;
 421         unsigned int hdr_len = skb_checksum_start_offset(skb);
 422         unsigned int csum_offset = hdr_len + skb->csum_offset;
 423         int eop = (len_left == 0);
 424
 425         /* Queue the main skb fragment. The fragments are no larger
 426          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 427          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 428          * per fragment is queued.
 429          */
 430         enic_queue_wq_desc_csum_l4(wq, skb,
 431                 pci_map_single(enic->pdev, skb->data,
 432                         head_len, PCI_DMA_TODEVICE),
 433                 head_len,
 434                 csum_offset,
 435                 hdr_len,
 436                 vlan_tag_insert, vlan_tag,
 437                 eop, loopback);
 438
 439         if (!eop)
 440                 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 441 }
 442
 443 static inline void enic_queue_wq_skb_tso(struct enic *enic,
 444         struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
 445         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 446 {
 447         unsigned int frag_len_left = skb_headlen(skb);
 448         unsigned int len_left = skb->len - frag_len_left;
 449         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 450         int eop = (len_left == 0);
 451         unsigned int len;
 452         dma_addr_t dma_addr;
 453         unsigned int offset = 0;
 454         skb_frag_t *frag;
 455
 456         /* Preload TCP csum field with IP pseudo hdr calculated
 457          * with IP length set to zero.  HW will later add in length
 458          * to each TCP segment resulting from the TSO.
 459          */
 460
 461         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 462                 ip_hdr(skb)->check = 0;
 463                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 464                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 465         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 466                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 467                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 468         }
 469
 470         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 471          * for the main skb fragment
 472          */
 473         while (frag_len_left) {
 474                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 475                 dma_addr = pci_map_single(enic->pdev, skb->data + offset,
 476                                 len, PCI_DMA_TODEVICE);
 477                 enic_queue_wq_desc_tso(wq, skb,
 478                         dma_addr,
 479                         len,
 480                         mss, hdr_len,
 481                         vlan_tag_insert, vlan_tag,
 482                         eop && (len == frag_len_left), loopback);
 483                 frag_len_left -= len;
 484                 offset += len;
 485         }
 486
 487         if (eop)
 488                 return;
 489
 490         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 491          * for additional data fragments
 492          */
 493         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 494                 len_left -= skb_frag_size(frag);
 495                 frag_len_left = skb_frag_size(frag);
 496                 offset = 0;
 497
 498                 while (frag_len_left) {
 499                         len = min(frag_len_left,
 500                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 501                         dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 502                                                     offset, len,
 503                                                     DMA_TO_DEVICE);
 504                         enic_queue_wq_desc_cont(wq, skb,
 505                                 dma_addr,
 506                                 len,
 507                                 (len_left == 0) &&
 508                                 (len == frag_len_left),         /* EOP? */
 509                                 loopback);
 510                         frag_len_left -= len;
 511                         offset += len;
 512                 }
 513         }
 514 }
 515
 516 static inline void enic_queue_wq_skb(struct enic *enic,
 517         struct vnic_wq *wq, struct sk_buff *skb)
 518 {
 519         unsigned int mss = skb_shinfo(skb)->gso_size;
 520         unsigned int vlan_tag = 0;
 521         int vlan_tag_insert = 0;
 522         int loopback = 0;
 523
 524         if (vlan_tx_tag_present(skb)) {
 525                 /* VLAN tag from trunking driver */
 526                 vlan_tag_insert = 1;
 527                 vlan_tag = vlan_tx_tag_get(skb);
 528         } else if (enic->loop_enable) {
 529                 vlan_tag = enic->loop_tag;
 530                 loopback = 1;
 531         }
 532
 533         if (mss)
 534                 enic_queue_wq_skb_tso(enic, wq, skb, mss,
 535                         vlan_tag_insert, vlan_tag, loopback);
 536         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 537                 enic_queue_wq_skb_csum_l4(enic, wq, skb,
 538                         vlan_tag_insert, vlan_tag, loopback);
 539         else
 540                 enic_queue_wq_skb_vlan(enic, wq, skb,
 541                         vlan_tag_insert, vlan_tag, loopback);
 542 }
 543
 544 /* netif_tx_lock held, process context with BHs disabled, or BH */
 545 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 546         struct net_device *netdev)
 547 {
 548         struct enic *enic = netdev_priv(netdev);
 549         struct vnic_wq *wq;
 550         unsigned long flags;
 551         unsigned int txq_map;
 552
 553         if (skb->len <= 0) {
 554                 dev_kfree_skb_any(skb);
 555                 return NETDEV_TX_OK;
 556         }
 557
 558         txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 559         wq = &enic->wq[txq_map];
 560
 561         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 562          * which is very likely.  In the off chance it's going to take
 563          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 564          */
 565
 566         if (skb_shinfo(skb)->gso_size == 0 &&
 567             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 568             skb_linearize(skb)) {
 569                 dev_kfree_skb_any(skb);
 570                 return NETDEV_TX_OK;
 571         }
 572
 573         spin_lock_irqsave(&enic->wq_lock[txq_map], flags);
 574
 575         if (vnic_wq_desc_avail(wq) <
 576             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 577                 netif_tx_stop_queue(netdev_get_tx_queue(netdev, txq_map));
 578                 /* This is a hard error, log it */
 579                 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 580                 spin_unlock_irqrestore(&enic->wq_lock[txq_map], flags);
 581                 return NETDEV_TX_BUSY;
 582         }
 583
 584         enic_queue_wq_skb(enic, wq, skb);
 585
 586         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 587                 netif_tx_stop_queue(netdev_get_tx_queue(netdev, txq_map));
 588
 589         spin_unlock_irqrestore(&enic->wq_lock[txq_map], flags);
 590
 591         return NETDEV_TX_OK;
 592 }
 593
 594 /* dev_base_lock rwlock held, nominally process context */
 595 static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
 596                                                 struct rtnl_link_stats64 *net_stats)
 597 {
 598         struct enic *enic = netdev_priv(netdev);
 599         struct vnic_stats *stats;
 600
 601         enic_dev_stats_dump(enic, &stats);
 602
 603         net_stats->tx_packets = stats->tx.tx_frames_ok;
 604         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 605         net_stats->tx_errors = stats->tx.tx_errors;
 606         net_stats->tx_dropped = stats->tx.tx_drops;
 607
 608         net_stats->rx_packets = stats->rx.rx_frames_ok;
 609         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 610         net_stats->rx_errors = stats->rx.rx_errors;
 611         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 612         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 613         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 614         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 615
 616         return net_stats;
 617 }
 618
 619 void enic_reset_addr_lists(struct enic *enic)
 620 {
 621         enic->mc_count = 0;
 622         enic->uc_count = 0;
 623         enic->flags = 0;
 624 }
 625
 626 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 627 {
 628         struct enic *enic = netdev_priv(netdev);
 629
 630         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 631                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 632                         return -EADDRNOTAVAIL;
 633         } else {
 634                 if (!is_valid_ether_addr(addr))
 635                         return -EADDRNOTAVAIL;
 636         }
 637
 638         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 639
 640         return 0;
 641 }
 642
 643 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 644 {
 645         struct enic *enic = netdev_priv(netdev);
 646         struct sockaddr *saddr = p;
 647         char *addr = saddr->sa_data;
 648         int err;
 649
 650         if (netif_running(enic->netdev)) {
 651                 err = enic_dev_del_station_addr(enic);
 652                 if (err)
 653                         return err;
 654         }
 655
 656         err = enic_set_mac_addr(netdev, addr);
 657         if (err)
 658                 return err;
 659
 660         if (netif_running(enic->netdev)) {
 661                 err = enic_dev_add_station_addr(enic);
 662                 if (err)
 663                         return err;
 664         }
 665
 666         return err;
 667 }
 668
 669 static int enic_set_mac_address(struct net_device *netdev, void *p)
 670 {
 671         struct sockaddr *saddr = p;
 672         char *addr = saddr->sa_data;
 673         struct enic *enic = netdev_priv(netdev);
 674         int err;
 675
 676         err = enic_dev_del_station_addr(enic);
 677         if (err)
 678                 return err;
 679
 680         err = enic_set_mac_addr(netdev, addr);
 681         if (err)
 682                 return err;
 683
 684         return enic_dev_add_station_addr(enic);
 685 }
 686
 687 static void enic_update_multicast_addr_list(struct enic *enic)
 688 {
 689         struct net_device *netdev = enic->netdev;
 690         struct netdev_hw_addr *ha;
 691         unsigned int mc_count = netdev_mc_count(netdev);
 692         u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
 693         unsigned int i, j;
 694
 695         if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS) {
 696                 netdev_warn(netdev, "Registering only %d out of %d "
 697                         "multicast addresses\n",
 698                         ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 699                 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
 700         }
 701
 702         /* Is there an easier way?  Trying to minimize to
 703          * calls to add/del multicast addrs.  We keep the
 704          * addrs from the last call in enic->mc_addr and
 705          * look for changes to add/del.
 706          */
 707
 708         i = 0;
 709         netdev_for_each_mc_addr(ha, netdev) {
 710                 if (i == mc_count)
 711                         break;
 712                 memcpy(mc_addr[i++], ha->addr, ETH_ALEN);
 713         }
 714
 715         for (i = 0; i < enic->mc_count; i++) {
 716                 for (j = 0; j < mc_count; j++)
 717                         if (ether_addr_equal(enic->mc_addr[i], mc_addr[j]))
 718                                 break;
 719                 if (j == mc_count)
 720                         enic_dev_del_addr(enic, enic->mc_addr[i]);
 721         }
 722
 723         for (i = 0; i < mc_count; i++) {
 724                 for (j = 0; j < enic->mc_count; j++)
 725                         if (ether_addr_equal(mc_addr[i], enic->mc_addr[j]))
 726                                 break;
 727                 if (j == enic->mc_count)
 728                         enic_dev_add_addr(enic, mc_addr[i]);
 729         }
 730
 731         /* Save the list to compare against next time
 732          */
 733
 734         for (i = 0; i < mc_count; i++)
 735                 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
 736
 737         enic->mc_count = mc_count;
 738 }
 739
 740 static void enic_update_unicast_addr_list(struct enic *enic)
 741 {
 742         struct net_device *netdev = enic->netdev;
 743         struct netdev_hw_addr *ha;
 744         unsigned int uc_count = netdev_uc_count(netdev);
 745         u8 uc_addr[ENIC_UNICAST_PERFECT_FILTERS][ETH_ALEN];
 746         unsigned int i, j;
 747
 748         if (uc_count > ENIC_UNICAST_PERFECT_FILTERS) {
 749                 netdev_warn(netdev, "Registering only %d out of %d "
 750                         "unicast addresses\n",
 751                         ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 752                 uc_count = ENIC_UNICAST_PERFECT_FILTERS;
 753         }
 754
 755         /* Is there an easier way?  Trying to minimize to
 756          * calls to add/del unicast addrs.  We keep the
 757          * addrs from the last call in enic->uc_addr and
 758          * look for changes to add/del.
 759          */
 760
 761         i = 0;
 762         netdev_for_each_uc_addr(ha, netdev) {
 763                 if (i == uc_count)
 764                         break;
 765                 memcpy(uc_addr[i++], ha->addr, ETH_ALEN);
 766         }
 767
 768         for (i = 0; i < enic->uc_count; i++) {
 769                 for (j = 0; j < uc_count; j++)
 770                         if (ether_addr_equal(enic->uc_addr[i], uc_addr[j]))
 771                                 break;
 772                 if (j == uc_count)
 773                         enic_dev_del_addr(enic, enic->uc_addr[i]);
 774         }
 775
 776         for (i = 0; i < uc_count; i++) {
 777                 for (j = 0; j < enic->uc_count; j++)
 778                         if (ether_addr_equal(uc_addr[i], enic->uc_addr[j]))
 779                                 break;
 780                 if (j == enic->uc_count)
 781                         enic_dev_add_addr(enic, uc_addr[i]);
 782         }
 783
 784         /* Save the list to compare against next time
 785          */
 786
 787         for (i = 0; i < uc_count; i++)
 788                 memcpy(enic->uc_addr[i], uc_addr[i], ETH_ALEN);
 789
 790         enic->uc_count = uc_count;
 791 }
 792
 793 /* netif_tx_lock held, BHs disabled */
 794 static void enic_set_rx_mode(struct net_device *netdev)
 795 {
 796         struct enic *enic = netdev_priv(netdev);
 797         int directed = 1;
 798         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 799         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 800         int promisc = (netdev->flags & IFF_PROMISC) ||
 801                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
 802         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 803                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
 804         unsigned int flags = netdev->flags |
 805                 (allmulti ? IFF_ALLMULTI : 0) |
 806                 (promisc ? IFF_PROMISC : 0);
 807
 808         if (enic->flags != flags) {
 809                 enic->flags = flags;
 810                 enic_dev_packet_filter(enic, directed,
 811                         multicast, broadcast, promisc, allmulti);
 812         }
 813
 814         if (!promisc) {
 815                 enic_update_unicast_addr_list(enic);
 816                 if (!allmulti)
 817                         enic_update_multicast_addr_list(enic);
 818         }
 819 }
 820
 821 /* netif_tx_lock held, BHs disabled */
 822 static void enic_tx_timeout(struct net_device *netdev)
 823 {
 824         struct enic *enic = netdev_priv(netdev);
 825         schedule_work(&enic->reset);
 826 }
 827
 828 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 829 {
 830         struct enic *enic = netdev_priv(netdev);
 831         struct enic_port_profile *pp;
 832         int err;
 833
 834         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 835         if (err)
 836                 return err;
 837
 838         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 839                 if (vf == PORT_SELF_VF) {
 840                         memcpy(pp->vf_mac, mac, ETH_ALEN);
 841                         return 0;
 842                 } else {
 843                         /*
 844                          * For sriov vf's set the mac in hw
 845                          */
 846                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 847                                 vnic_dev_set_mac_addr, mac);
 848                         return enic_dev_status_to_errno(err);
 849                 }
 850         } else
 851                 return -EINVAL;
 852 }
 853
 854 static int enic_set_vf_port(struct net_device *netdev, int vf,
 855         struct nlattr *port[])
 856 {
 857         struct enic *enic = netdev_priv(netdev);
 858         struct enic_port_profile prev_pp;
 859         struct enic_port_profile *pp;
 860         int err = 0, restore_pp = 1;
 861
 862         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 863         if (err)
 864                 return err;
 865
 866         if (!port[IFLA_PORT_REQUEST])
 867                 return -EOPNOTSUPP;
 868
 869         memcpy(&prev_pp, pp, sizeof(*enic->pp));
 870         memset(pp, 0, sizeof(*enic->pp));
 871
 872         pp->set |= ENIC_SET_REQUEST;
 873         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
 874
 875         if (port[IFLA_PORT_PROFILE]) {
 876                 pp->set |= ENIC_SET_NAME;
 877                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
 878                         PORT_PROFILE_MAX);
 879         }
 880
 881         if (port[IFLA_PORT_INSTANCE_UUID]) {
 882                 pp->set |= ENIC_SET_INSTANCE;
 883                 memcpy(pp->instance_uuid,
 884                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
 885         }
 886
 887         if (port[IFLA_PORT_HOST_UUID]) {
 888                 pp->set |= ENIC_SET_HOST;
 889                 memcpy(pp->host_uuid,
 890                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
 891         }
 892
 893         if (vf == PORT_SELF_VF) {
 894                 /* Special case handling: mac came from IFLA_VF_MAC */
 895                 if (!is_zero_ether_addr(prev_pp.vf_mac))
 896                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
 897
 898                 if (is_zero_ether_addr(netdev->dev_addr))
 899                         eth_hw_addr_random(netdev);
 900         } else {
 901                 /* SR-IOV VF: get mac from adapter */
 902                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 903                         vnic_dev_get_mac_addr, pp->mac_addr);
 904                 if (err) {
 905                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
 906                         memcpy(pp, &prev_pp, sizeof(*pp));
 907                         return enic_dev_status_to_errno(err);
 908                 }
 909         }
 910
 911         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
 912         if (err) {
 913                 if (restore_pp) {
 914                         /* Things are still the way they were: Implicit
 915                          * DISASSOCIATE failed
 916                          */
 917                         memcpy(pp, &prev_pp, sizeof(*pp));
 918                 } else {
 919                         memset(pp, 0, sizeof(*pp));
 920                         if (vf == PORT_SELF_VF)
 921                                 memset(netdev->dev_addr, 0, ETH_ALEN);
 922                 }
 923         } else {
 924                 /* Set flag to indicate that the port assoc/disassoc
 925                  * request has been sent out to fw
 926                  */
 927                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
 928
 929                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
 930                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
 931                         memset(pp->mac_addr, 0, ETH_ALEN);
 932                         if (vf == PORT_SELF_VF)
 933                                 memset(netdev->dev_addr, 0, ETH_ALEN);
 934                 }
 935         }
 936
 937         if (vf == PORT_SELF_VF)
 938                 memset(pp->vf_mac, 0, ETH_ALEN);
 939
 940         return err;
 941 }
 942
 943 static int enic_get_vf_port(struct net_device *netdev, int vf,
 944         struct sk_buff *skb)
 945 {
 946         struct enic *enic = netdev_priv(netdev);
 947         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
 948         struct enic_port_profile *pp;
 949         int err;
 950
 951         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 952         if (err)
 953                 return err;
 954
 955         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
 956                 return -ENODATA;
 957
 958         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
 959         if (err)
 960                 return err;
 961
 962         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
 963             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
 964             ((pp->set & ENIC_SET_NAME) &&
 965              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
 966             ((pp->set & ENIC_SET_INSTANCE) &&
 967              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
 968                      pp->instance_uuid)) ||
 969             ((pp->set & ENIC_SET_HOST) &&
 970              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
 971                 goto nla_put_failure;
 972         return 0;
 973
 974 nla_put_failure:
 975         return -EMSGSIZE;
 976 }
 977
 978 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 979 {
 980         struct enic *enic = vnic_dev_priv(rq->vdev);
 981
 982         if (!buf->os_buf)
 983                 return;
 984
 985         pci_unmap_single(enic->pdev, buf->dma_addr,
 986                 buf->len, PCI_DMA_FROMDEVICE);
 987         dev_kfree_skb_any(buf->os_buf);
 988 }
 989
 990 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 991 {
 992         struct enic *enic = vnic_dev_priv(rq->vdev);
 993         struct net_device *netdev = enic->netdev;
 994         struct sk_buff *skb;
 995         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
 996         unsigned int os_buf_index = 0;
 997         dma_addr_t dma_addr;
 998
 999         skb = netdev_alloc_skb_ip_align(netdev, len);
1000         if (!skb)
1001                 return -ENOMEM;
1002
1003         dma_addr = pci_map_single(enic->pdev, skb->data,
1004                 len, PCI_DMA_FROMDEVICE);
1005
1006         enic_queue_rq_desc(rq, skb, os_buf_index,
1007                 dma_addr, len);
1008
1009         return 0;
1010 }
1011
1012 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1013                                       u32 pkt_len)
1014 {
1015         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1016                 pkt_size->large_pkt_bytes_cnt += pkt_len;
1017         else
1018                 pkt_size->small_pkt_bytes_cnt += pkt_len;
1019 }
1020
1021 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1022         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1023         int skipped, void *opaque)
1024 {
1025         struct enic *enic = vnic_dev_priv(rq->vdev);
1026         struct net_device *netdev = enic->netdev;
1027         struct sk_buff *skb;
1028         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1029
1030         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1031         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1032         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1033         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1034         u8 packet_error;
1035         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1036         u32 rss_hash;
1037
1038         if (skipped)
1039                 return;
1040
1041         skb = buf->os_buf;
1042         prefetch(skb->data - NET_IP_ALIGN);
1043         pci_unmap_single(enic->pdev, buf->dma_addr,
1044                 buf->len, PCI_DMA_FROMDEVICE);
1045
1046         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1047                 &type, &color, &q_number, &completed_index,
1048                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1049                 &csum_not_calc, &rss_hash, &bytes_written,
1050                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1051                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1052                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1053                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1054                 &fcs_ok);
1055
1056         if (packet_error) {
1057
1058                 if (!fcs_ok) {
1059                         if (bytes_written > 0)
1060                                 enic->rq_bad_fcs++;
1061                         else if (bytes_written == 0)
1062                                 enic->rq_truncated_pkts++;
1063                 }
1064
1065                 dev_kfree_skb_any(skb);
1066
1067                 return;
1068         }
1069
1070         if (eop && bytes_written > 0) {
1071
1072                 /* Good receive
1073                  */
1074
1075                 skb_put(skb, bytes_written);
1076                 skb->protocol = eth_type_trans(skb, netdev);
1077                 skb_record_rx_queue(skb, q_number);
1078                 if (netdev->features & NETIF_F_RXHASH) {
1079                         skb_set_hash(skb, rss_hash,
1080                                      (rss_type &
1081                                       (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
1082                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
1083                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
1084                                      PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
1085                 }
1086
1087                 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc) {
1088                         skb->csum = htons(checksum);
1089                         skb->ip_summed = CHECKSUM_COMPLETE;
1090                 }
1091
1092                 if (vlan_stripped)
1093                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1094
1095                 if (netdev->features & NETIF_F_GRO)
1096                         napi_gro_receive(&enic->napi[q_number], skb);
1097                 else
1098                         netif_receive_skb(skb);
1099                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1100                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1101                                                   bytes_written);
1102         } else {
1103
1104                 /* Buffer overflow
1105                  */
1106
1107                 dev_kfree_skb_any(skb);
1108         }
1109 }
1110
1111 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1112         u8 type, u16 q_number, u16 completed_index, void *opaque)
1113 {
1114         struct enic *enic = vnic_dev_priv(vdev);
1115
1116         vnic_rq_service(&enic->rq[q_number], cq_desc,
1117                 completed_index, VNIC_RQ_RETURN_DESC,
1118                 enic_rq_indicate_buf, opaque);
1119
1120         return 0;
1121 }
1122
1123 static int enic_poll(struct napi_struct *napi, int budget)
1124 {
1125         struct net_device *netdev = napi->dev;
1126         struct enic *enic = netdev_priv(netdev);
1127         unsigned int cq_rq = enic_cq_rq(enic, 0);
1128         unsigned int cq_wq = enic_cq_wq(enic, 0);
1129         unsigned int intr = enic_legacy_io_intr();
1130         unsigned int rq_work_to_do = budget;
1131         unsigned int wq_work_to_do = -1; /* no limit */
1132         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1133         int err;
1134
1135         /* Service RQ (first) and WQ
1136          */
1137
1138         if (budget > 0)
1139                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1140                         rq_work_to_do, enic_rq_service, NULL);
1141
1142         wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
1143                 wq_work_to_do, enic_wq_service, NULL);
1144
1145         /* Accumulate intr event credits for this polling
1146          * cycle.  An intr event is the completion of a
1147          * a WQ or RQ packet.
1148          */
1149
1150         work_done = rq_work_done + wq_work_done;
1151
1152         if (work_done > 0)
1153                 vnic_intr_return_credits(&enic->intr[intr],
1154                         work_done,
1155                         0 /* don't unmask intr */,
1156                         0 /* don't reset intr timer */);
1157
1158         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1159
1160         /* Buffer allocation failed. Stay in polling
1161          * mode so we can try to fill the ring again.
1162          */
1163
1164         if (err)
1165                 rq_work_done = rq_work_to_do;
1166
1167         if (rq_work_done < rq_work_to_do) {
1168
1169                 /* Some work done, but not enough to stay in polling,
1170                  * exit polling
1171                  */
1172
1173                 napi_complete(napi);
1174                 vnic_intr_unmask(&enic->intr[intr]);
1175         }
1176
1177         return rq_work_done;
1178 }
1179
1180 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1181 {
1182         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1183         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1184         u32 timer = cq->tobe_rx_coal_timeval;
1185
1186         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1187                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1188                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1189         }
1190 }
1191
1192 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1193 {
1194         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1195         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1196         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1197         int index;
1198         u32 timer;
1199         u32 range_start;
1200         u32 traffic;
1201         u64 delta;
1202         ktime_t now = ktime_get();
1203
1204         delta = ktime_us_delta(now, cq->prev_ts);
1205         if (delta < ENIC_AIC_TS_BREAK)
1206                 return;
1207         cq->prev_ts = now;
1208
1209         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1210                   pkt_size_counter->small_pkt_bytes_cnt;
1211         /* The table takes Mbps
1212          * traffic *= 8    => bits
1213          * traffic *= (10^6 / delta)    => bps
1214          * traffic /= 10^6     => Mbps
1215          *
1216          * Combining, traffic *= (8 / delta)
1217          */
1218
1219         traffic <<= 3;
1220         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1221
1222         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1223                 if (traffic < mod_table[index].rx_rate)
1224                         break;
1225         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1226                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1227                       rx_coal->small_pkt_range_start :
1228                       rx_coal->large_pkt_range_start;
1229         timer = range_start + ((rx_coal->range_end - range_start) *
1230                                mod_table[index].range_percent / 100);
1231         /* Damping */
1232         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1233
1234         pkt_size_counter->large_pkt_bytes_cnt = 0;
1235         pkt_size_counter->small_pkt_bytes_cnt = 0;
1236 }
1237
1238 static int enic_poll_msix(struct napi_struct *napi, int budget)
1239 {
1240         struct net_device *netdev = napi->dev;
1241         struct enic *enic = netdev_priv(netdev);
1242         unsigned int rq = (napi - &enic->napi[0]);
1243         unsigned int cq = enic_cq_rq(enic, rq);
1244         unsigned int intr = enic_msix_rq_intr(enic, rq);
1245         unsigned int work_to_do = budget;
1246         unsigned int work_done = 0;
1247         int err;
1248
1249         /* Service RQ
1250          */
1251
1252         if (budget > 0)
1253                 work_done = vnic_cq_service(&enic->cq[cq],
1254                         work_to_do, enic_rq_service, NULL);
1255
1256         /* Return intr event credits for this polling
1257          * cycle.  An intr event is the completion of a
1258          * RQ packet.
1259          */
1260
1261         if (work_done > 0)
1262                 vnic_intr_return_credits(&enic->intr[intr],
1263                         work_done,
1264                         0 /* don't unmask intr */,
1265                         0 /* don't reset intr timer */);
1266
1267         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1268
1269         /* Buffer allocation failed. Stay in polling mode
1270          * so we can try to fill the ring again.
1271          */
1272
1273         if (err)
1274                 work_done = work_to_do;
1275         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1276                 /* Call the function which refreshes
1277                  * the intr coalescing timer value based on
1278                  * the traffic.  This is supported only in
1279                  * the case of MSI-x mode
1280                  */
1281                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1282
1283         if (work_done < work_to_do) {
1284
1285                 /* Some work done, but not enough to stay in polling,
1286                  * exit polling
1287                  */
1288
1289                 napi_complete(napi);
1290                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1291                         enic_set_int_moderation(enic, &enic->rq[rq]);
1292                 vnic_intr_unmask(&enic->intr[intr]);
1293         }
1294
1295         return work_done;
1296 }
1297
1298 static void enic_notify_timer(unsigned long data)
1299 {
1300         struct enic *enic = (struct enic *)data;
1301
1302         enic_notify_check(enic);
1303
1304         mod_timer(&enic->notify_timer,
1305                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1306 }
1307
1308 static void enic_free_intr(struct enic *enic)
1309 {
1310         struct net_device *netdev = enic->netdev;
1311         unsigned int i;
1312
1313         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1314         case VNIC_DEV_INTR_MODE_INTX:
1315                 free_irq(enic->pdev->irq, netdev);
1316                 break;
1317         case VNIC_DEV_INTR_MODE_MSI:
1318                 free_irq(enic->pdev->irq, enic);
1319                 break;
1320         case VNIC_DEV_INTR_MODE_MSIX:
1321                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1322                         if (enic->msix[i].requested)
1323                                 free_irq(enic->msix_entry[i].vector,
1324                                         enic->msix[i].devid);
1325                 break;
1326         default:
1327                 break;
1328         }
1329 }
1330
1331 static int enic_request_intr(struct enic *enic)
1332 {
1333         struct net_device *netdev = enic->netdev;
1334         unsigned int i, intr;
1335         int err = 0;
1336
1337         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1338
1339         case VNIC_DEV_INTR_MODE_INTX:
1340
1341                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1342                         IRQF_SHARED, netdev->name, netdev);
1343                 break;
1344
1345         case VNIC_DEV_INTR_MODE_MSI:
1346
1347                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1348                         0, netdev->name, enic);
1349                 break;
1350
1351         case VNIC_DEV_INTR_MODE_MSIX:
1352
1353                 for (i = 0; i < enic->rq_count; i++) {
1354                         intr = enic_msix_rq_intr(enic, i);
1355                         snprintf(enic->msix[intr].devname,
1356                                 sizeof(enic->msix[intr].devname),
1357                                 "%.11s-rx-%d", netdev->name, i);
1358                         enic->msix[intr].isr = enic_isr_msix_rq;
1359                         enic->msix[intr].devid = &enic->napi[i];
1360                 }
1361
1362                 for (i = 0; i < enic->wq_count; i++) {
1363                         intr = enic_msix_wq_intr(enic, i);
1364                         snprintf(enic->msix[intr].devname,
1365                                 sizeof(enic->msix[intr].devname),
1366                                 "%.11s-tx-%d", netdev->name, i);
1367                         enic->msix[intr].isr = enic_isr_msix_wq;
1368                         enic->msix[intr].devid = enic;
1369                 }
1370
1371                 intr = enic_msix_err_intr(enic);
1372                 snprintf(enic->msix[intr].devname,
1373                         sizeof(enic->msix[intr].devname),
1374                         "%.11s-err", netdev->name);
1375                 enic->msix[intr].isr = enic_isr_msix_err;
1376                 enic->msix[intr].devid = enic;
1377
1378                 intr = enic_msix_notify_intr(enic);
1379                 snprintf(enic->msix[intr].devname,
1380                         sizeof(enic->msix[intr].devname),
1381                         "%.11s-notify", netdev->name);
1382                 enic->msix[intr].isr = enic_isr_msix_notify;
1383                 enic->msix[intr].devid = enic;
1384
1385                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1386                         enic->msix[i].requested = 0;
1387
1388                 for (i = 0; i < enic->intr_count; i++) {
1389                         err = request_irq(enic->msix_entry[i].vector,
1390                                 enic->msix[i].isr, 0,
1391                                 enic->msix[i].devname,
1392                                 enic->msix[i].devid);
1393                         if (err) {
1394                                 enic_free_intr(enic);
1395                                 break;
1396                         }
1397                         enic->msix[i].requested = 1;
1398                 }
1399
1400                 break;
1401
1402         default:
1403                 break;
1404         }
1405
1406         return err;
1407 }
1408
1409 static void enic_synchronize_irqs(struct enic *enic)
1410 {
1411         unsigned int i;
1412
1413         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1414         case VNIC_DEV_INTR_MODE_INTX:
1415         case VNIC_DEV_INTR_MODE_MSI:
1416                 synchronize_irq(enic->pdev->irq);
1417                 break;
1418         case VNIC_DEV_INTR_MODE_MSIX:
1419                 for (i = 0; i < enic->intr_count; i++)
1420                         synchronize_irq(enic->msix_entry[i].vector);
1421                 break;
1422         default:
1423                 break;
1424         }
1425 }
1426
1427 static void enic_set_rx_coal_setting(struct enic *enic)
1428 {
1429         unsigned int speed;
1430         int index = -1;
1431         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1432
1433         /* If intr mode is not MSIX, do not do adaptive coalescing */
1434         if (VNIC_DEV_INTR_MODE_MSIX != vnic_dev_get_intr_mode(enic->vdev)) {
1435                 netdev_info(enic->netdev, "INTR mode is not MSIX, Not initializing adaptive coalescing");
1436                 return;
1437         }
1438
1439         /* 1. Read the link speed from fw
1440          * 2. Pick the default range for the speed
1441          * 3. Update it in enic->rx_coalesce_setting
1442          */
1443         speed = vnic_dev_port_speed(enic->vdev);
1444         if (ENIC_LINK_SPEED_10G < speed)
1445                 index = ENIC_LINK_40G_INDEX;
1446         else if (ENIC_LINK_SPEED_4G < speed)
1447                 index = ENIC_LINK_10G_INDEX;
1448         else
1449                 index = ENIC_LINK_4G_INDEX;
1450
1451         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1452         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1453         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1454
1455         /* Start with the value provided by UCSM */
1456         for (index = 0; index < enic->rq_count; index++)
1457                 enic->cq[index].cur_rx_coal_timeval =
1458                                 enic->config.intr_timer_usec;
1459
1460         rx_coal->use_adaptive_rx_coalesce = 1;
1461 }
1462
1463 static int enic_dev_notify_set(struct enic *enic)
1464 {
1465         int err;
1466
1467         spin_lock(&enic->devcmd_lock);
1468         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1469         case VNIC_DEV_INTR_MODE_INTX:
1470                 err = vnic_dev_notify_set(enic->vdev,
1471                         enic_legacy_notify_intr());
1472                 break;
1473         case VNIC_DEV_INTR_MODE_MSIX:
1474                 err = vnic_dev_notify_set(enic->vdev,
1475                         enic_msix_notify_intr(enic));
1476                 break;
1477         default:
1478                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1479                 break;
1480         }
1481         spin_unlock(&enic->devcmd_lock);
1482
1483         return err;
1484 }
1485
1486 static void enic_notify_timer_start(struct enic *enic)
1487 {
1488         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1489         case VNIC_DEV_INTR_MODE_MSI:
1490                 mod_timer(&enic->notify_timer, jiffies);
1491                 break;
1492         default:
1493                 /* Using intr for notification for INTx/MSI-X */
1494                 break;
1495         }
1496 }
1497
1498 /* rtnl lock is held, process context */
1499 static int enic_open(struct net_device *netdev)
1500 {
1501         struct enic *enic = netdev_priv(netdev);
1502         unsigned int i;
1503         int err;
1504
1505         err = enic_request_intr(enic);
1506         if (err) {
1507                 netdev_err(netdev, "Unable to request irq.\n");
1508                 return err;
1509         }
1510
1511         err = enic_dev_notify_set(enic);
1512         if (err) {
1513                 netdev_err(netdev,
1514                         "Failed to alloc notify buffer, aborting.\n");
1515                 goto err_out_free_intr;
1516         }
1517
1518         for (i = 0; i < enic->rq_count; i++) {
1519                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1520                 /* Need at least one buffer on ring to get going */
1521                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1522                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1523                         err = -ENOMEM;
1524                         goto err_out_notify_unset;
1525                 }
1526         }
1527
1528         for (i = 0; i < enic->wq_count; i++)
1529                 vnic_wq_enable(&enic->wq[i]);
1530         for (i = 0; i < enic->rq_count; i++)
1531                 vnic_rq_enable(&enic->rq[i]);
1532
1533         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1534                 enic_dev_add_station_addr(enic);
1535
1536         enic_set_rx_mode(netdev);
1537
1538         netif_tx_wake_all_queues(netdev);
1539
1540         for (i = 0; i < enic->rq_count; i++)
1541                 napi_enable(&enic->napi[i]);
1542
1543         enic_dev_enable(enic);
1544
1545         for (i = 0; i < enic->intr_count; i++)
1546                 vnic_intr_unmask(&enic->intr[i]);
1547
1548         enic_notify_timer_start(enic);
1549
1550         return 0;
1551
1552 err_out_notify_unset:
1553         enic_dev_notify_unset(enic);
1554 err_out_free_intr:
1555         enic_free_intr(enic);
1556
1557         return err;
1558 }
1559
1560 /* rtnl lock is held, process context */
1561 static int enic_stop(struct net_device *netdev)
1562 {
1563         struct enic *enic = netdev_priv(netdev);
1564         unsigned int i;
1565         int err;
1566
1567         for (i = 0; i < enic->intr_count; i++) {
1568                 vnic_intr_mask(&enic->intr[i]);
1569                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1570         }
1571
1572         enic_synchronize_irqs(enic);
1573
1574         del_timer_sync(&enic->notify_timer);
1575
1576         enic_dev_disable(enic);
1577
1578         for (i = 0; i < enic->rq_count; i++)
1579                 napi_disable(&enic->napi[i]);
1580
1581         netif_carrier_off(netdev);
1582         netif_tx_disable(netdev);
1583
1584         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1585                 enic_dev_del_station_addr(enic);
1586
1587         for (i = 0; i < enic->wq_count; i++) {
1588                 err = vnic_wq_disable(&enic->wq[i]);
1589                 if (err)
1590                         return err;
1591         }
1592         for (i = 0; i < enic->rq_count; i++) {
1593                 err = vnic_rq_disable(&enic->rq[i]);
1594                 if (err)
1595                         return err;
1596         }
1597
1598         enic_dev_notify_unset(enic);
1599         enic_free_intr(enic);
1600
1601         for (i = 0; i < enic->wq_count; i++)
1602                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1603         for (i = 0; i < enic->rq_count; i++)
1604                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1605         for (i = 0; i < enic->cq_count; i++)
1606                 vnic_cq_clean(&enic->cq[i]);
1607         for (i = 0; i < enic->intr_count; i++)
1608                 vnic_intr_clean(&enic->intr[i]);
1609
1610         return 0;
1611 }
1612
1613 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1614 {
1615         struct enic *enic = netdev_priv(netdev);
1616         int running = netif_running(netdev);
1617
1618         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1619                 return -EINVAL;
1620
1621         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1622                 return -EOPNOTSUPP;
1623
1624         if (running)
1625                 enic_stop(netdev);
1626
1627         netdev->mtu = new_mtu;
1628
1629         if (netdev->mtu > enic->port_mtu)
1630                 netdev_warn(netdev,
1631                         "interface MTU (%d) set higher than port MTU (%d)\n",
1632                         netdev->mtu, enic->port_mtu);
1633
1634         if (running)
1635                 enic_open(netdev);
1636
1637         return 0;
1638 }
1639
1640 static void enic_change_mtu_work(struct work_struct *work)
1641 {
1642         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1643         struct net_device *netdev = enic->netdev;
1644         int new_mtu = vnic_dev_mtu(enic->vdev);
1645         int err;
1646         unsigned int i;
1647
1648         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1649
1650         rtnl_lock();
1651
1652         /* Stop RQ */
1653         del_timer_sync(&enic->notify_timer);
1654
1655         for (i = 0; i < enic->rq_count; i++)
1656                 napi_disable(&enic->napi[i]);
1657
1658         vnic_intr_mask(&enic->intr[0]);
1659         enic_synchronize_irqs(enic);
1660         err = vnic_rq_disable(&enic->rq[0]);
1661         if (err) {
1662                 rtnl_unlock();
1663                 netdev_err(netdev, "Unable to disable RQ.\n");
1664                 return;
1665         }
1666         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1667         vnic_cq_clean(&enic->cq[0]);
1668         vnic_intr_clean(&enic->intr[0]);
1669
1670         /* Fill RQ with new_mtu-sized buffers */
1671         netdev->mtu = new_mtu;
1672         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1673         /* Need at least one buffer on ring to get going */
1674         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1675                 rtnl_unlock();
1676                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1677                 return;
1678         }
1679
1680         /* Start RQ */
1681         vnic_rq_enable(&enic->rq[0]);
1682         napi_enable(&enic->napi[0]);
1683         vnic_intr_unmask(&enic->intr[0]);
1684         enic_notify_timer_start(enic);
1685
1686         rtnl_unlock();
1687
1688         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1689 }
1690
1691 #ifdef CONFIG_NET_POLL_CONTROLLER
1692 static void enic_poll_controller(struct net_device *netdev)
1693 {
1694         struct enic *enic = netdev_priv(netdev);
1695         struct vnic_dev *vdev = enic->vdev;
1696         unsigned int i, intr;
1697
1698         switch (vnic_dev_get_intr_mode(vdev)) {
1699         case VNIC_DEV_INTR_MODE_MSIX:
1700                 for (i = 0; i < enic->rq_count; i++) {
1701                         intr = enic_msix_rq_intr(enic, i);
1702                         enic_isr_msix_rq(enic->msix_entry[intr].vector,
1703                                 &enic->napi[i]);
1704                 }
1705
1706                 for (i = 0; i < enic->wq_count; i++) {
1707                         intr = enic_msix_wq_intr(enic, i);
1708                         enic_isr_msix_wq(enic->msix_entry[intr].vector, enic);
1709                 }
1710
1711                 break;
1712         case VNIC_DEV_INTR_MODE_MSI:
1713                 enic_isr_msi(enic->pdev->irq, enic);
1714                 break;
1715         case VNIC_DEV_INTR_MODE_INTX:
1716                 enic_isr_legacy(enic->pdev->irq, netdev);
1717                 break;
1718         default:
1719                 break;
1720         }
1721 }
1722 #endif
1723
1724 static int enic_dev_wait(struct vnic_dev *vdev,
1725         int (*start)(struct vnic_dev *, int),
1726         int (*finished)(struct vnic_dev *, int *),
1727         int arg)
1728 {
1729         unsigned long time;
1730         int done;
1731         int err;
1732
1733         BUG_ON(in_interrupt());
1734
1735         err = start(vdev, arg);
1736         if (err)
1737                 return err;
1738
1739         /* Wait for func to complete...2 seconds max
1740          */
1741
1742         time = jiffies + (HZ * 2);
1743         do {
1744
1745                 err = finished(vdev, &done);
1746                 if (err)
1747                         return err;
1748
1749                 if (done)
1750                         return 0;
1751
1752                 schedule_timeout_uninterruptible(HZ / 10);
1753
1754         } while (time_after(time, jiffies));
1755
1756         return -ETIMEDOUT;
1757 }
1758
1759 static int enic_dev_open(struct enic *enic)
1760 {
1761         int err;
1762
1763         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1764                 vnic_dev_open_done, 0);
1765         if (err)
1766                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1767                         err);
1768
1769         return err;
1770 }
1771
1772 static int enic_dev_hang_reset(struct enic *enic)
1773 {
1774         int err;
1775
1776         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1777                 vnic_dev_hang_reset_done, 0);
1778         if (err)
1779                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1780                         err);
1781
1782         return err;
1783 }
1784
1785 static int enic_set_rsskey(struct enic *enic)
1786 {
1787         dma_addr_t rss_key_buf_pa;
1788         union vnic_rss_key *rss_key_buf_va = NULL;
1789         union vnic_rss_key rss_key = {
1790                 .key[0].b = {85, 67, 83, 97, 119, 101, 115, 111, 109, 101},
1791                 .key[1].b = {80, 65, 76, 79, 117, 110, 105, 113, 117, 101},
1792                 .key[2].b = {76, 73, 78, 85, 88, 114, 111, 99, 107, 115},
1793                 .key[3].b = {69, 78, 73, 67, 105, 115, 99, 111, 111, 108},
1794         };
1795         int err;
1796
1797         rss_key_buf_va = pci_alloc_consistent(enic->pdev,
1798                 sizeof(union vnic_rss_key), &rss_key_buf_pa);
1799         if (!rss_key_buf_va)
1800                 return -ENOMEM;
1801
1802         memcpy(rss_key_buf_va, &rss_key, sizeof(union vnic_rss_key));
1803
1804         spin_lock(&enic->devcmd_lock);
1805         err = enic_set_rss_key(enic,
1806                 rss_key_buf_pa,
1807                 sizeof(union vnic_rss_key));
1808         spin_unlock(&enic->devcmd_lock);
1809
1810         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1811                 rss_key_buf_va, rss_key_buf_pa);
1812
1813         return err;
1814 }
1815
1816 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1817 {
1818         dma_addr_t rss_cpu_buf_pa;
1819         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1820         unsigned int i;
1821         int err;
1822
1823         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1824                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1825         if (!rss_cpu_buf_va)
1826                 return -ENOMEM;
1827
1828         for (i = 0; i < (1 << rss_hash_bits); i++)
1829                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1830
1831         spin_lock(&enic->devcmd_lock);
1832         err = enic_set_rss_cpu(enic,
1833                 rss_cpu_buf_pa,
1834                 sizeof(union vnic_rss_cpu));
1835         spin_unlock(&enic->devcmd_lock);
1836
1837         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1838                 rss_cpu_buf_va, rss_cpu_buf_pa);
1839
1840         return err;
1841 }
1842
1843 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
1844         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
1845 {
1846         const u8 tso_ipid_split_en = 0;
1847         const u8 ig_vlan_strip_en = 1;
1848         int err;
1849
1850         /* Enable VLAN tag stripping.
1851         */
1852
1853         spin_lock(&enic->devcmd_lock);
1854         err = enic_set_nic_cfg(enic,
1855                 rss_default_cpu, rss_hash_type,
1856                 rss_hash_bits, rss_base_cpu,
1857                 rss_enable, tso_ipid_split_en,
1858                 ig_vlan_strip_en);
1859         spin_unlock(&enic->devcmd_lock);
1860
1861         return err;
1862 }
1863
1864 static int enic_set_rss_nic_cfg(struct enic *enic)
1865 {
1866         struct device *dev = enic_get_dev(enic);
1867         const u8 rss_default_cpu = 0;
1868         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
1869                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
1870                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
1871                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
1872         const u8 rss_hash_bits = 7;
1873         const u8 rss_base_cpu = 0;
1874         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
1875
1876         if (rss_enable) {
1877                 if (!enic_set_rsskey(enic)) {
1878                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
1879                                 rss_enable = 0;
1880                                 dev_warn(dev, "RSS disabled, "
1881                                         "Failed to set RSS cpu indirection table.");
1882                         }
1883                 } else {
1884                         rss_enable = 0;
1885                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
1886                 }
1887         }
1888
1889         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
1890                 rss_hash_bits, rss_base_cpu, rss_enable);
1891 }
1892
1893 static void enic_reset(struct work_struct *work)
1894 {
1895         struct enic *enic = container_of(work, struct enic, reset);
1896
1897         if (!netif_running(enic->netdev))
1898                 return;
1899
1900         rtnl_lock();
1901
1902         spin_lock(&enic->enic_api_lock);
1903         enic_dev_hang_notify(enic);
1904         enic_stop(enic->netdev);
1905         enic_dev_hang_reset(enic);
1906         enic_reset_addr_lists(enic);
1907         enic_init_vnic_resources(enic);
1908         enic_set_rss_nic_cfg(enic);
1909         enic_dev_set_ig_vlan_rewrite_mode(enic);
1910         enic_open(enic->netdev);
1911         spin_unlock(&enic->enic_api_lock);
1912         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
1913
1914         rtnl_unlock();
1915 }
1916
1917 static int enic_set_intr_mode(struct enic *enic)
1918 {
1919         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
1920         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
1921         unsigned int i;
1922
1923         /* Set interrupt mode (INTx, MSI, MSI-X) depending
1924          * on system capabilities.
1925          *
1926          * Try MSI-X first
1927          *
1928          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1929          * (the second to last INTR is used for WQ/RQ errors)
1930          * (the last INTR is used for notifications)
1931          */
1932
1933         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1934         for (i = 0; i < n + m + 2; i++)
1935                 enic->msix_entry[i].entry = i;
1936
1937         /* Use multiple RQs if RSS is enabled
1938          */
1939
1940         if (ENIC_SETTING(enic, RSS) &&
1941             enic->config.intr_mode < 1 &&
1942             enic->rq_count >= n &&
1943             enic->wq_count >= m &&
1944             enic->cq_count >= n + m &&
1945             enic->intr_count >= n + m + 2) {
1946
1947                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
1948                                           n + m + 2, n + m + 2) > 0) {
1949
1950                         enic->rq_count = n;
1951                         enic->wq_count = m;
1952                         enic->cq_count = n + m;
1953                         enic->intr_count = n + m + 2;
1954
1955                         vnic_dev_set_intr_mode(enic->vdev,
1956                                 VNIC_DEV_INTR_MODE_MSIX);
1957
1958                         return 0;
1959                 }
1960         }
1961
1962         if (enic->config.intr_mode < 1 &&
1963             enic->rq_count >= 1 &&
1964             enic->wq_count >= m &&
1965             enic->cq_count >= 1 + m &&
1966             enic->intr_count >= 1 + m + 2) {
1967                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
1968                                           1 + m + 2, 1 + m + 2) > 0) {
1969
1970                         enic->rq_count = 1;
1971                         enic->wq_count = m;
1972                         enic->cq_count = 1 + m;
1973                         enic->intr_count = 1 + m + 2;
1974
1975                         vnic_dev_set_intr_mode(enic->vdev,
1976                                 VNIC_DEV_INTR_MODE_MSIX);
1977
1978                         return 0;
1979                 }
1980         }
1981
1982         /* Next try MSI
1983          *
1984          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
1985          */
1986
1987         if (enic->config.intr_mode < 2 &&
1988             enic->rq_count >= 1 &&
1989             enic->wq_count >= 1 &&
1990             enic->cq_count >= 2 &&
1991             enic->intr_count >= 1 &&
1992             !pci_enable_msi(enic->pdev)) {
1993
1994                 enic->rq_count = 1;
1995                 enic->wq_count = 1;
1996                 enic->cq_count = 2;
1997                 enic->intr_count = 1;
1998
1999                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2000
2001                 return 0;
2002         }
2003
2004         /* Next try INTx
2005          *
2006          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2007          * (the first INTR is used for WQ/RQ)
2008          * (the second INTR is used for WQ/RQ errors)
2009          * (the last INTR is used for notifications)
2010          */
2011
2012         if (enic->config.intr_mode < 3 &&
2013             enic->rq_count >= 1 &&
2014             enic->wq_count >= 1 &&
2015             enic->cq_count >= 2 &&
2016             enic->intr_count >= 3) {
2017
2018                 enic->rq_count = 1;
2019                 enic->wq_count = 1;
2020                 enic->cq_count = 2;
2021                 enic->intr_count = 3;
2022
2023                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2024
2025                 return 0;
2026         }
2027
2028         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2029
2030         return -EINVAL;
2031 }
2032
2033 static void enic_clear_intr_mode(struct enic *enic)
2034 {
2035         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2036         case VNIC_DEV_INTR_MODE_MSIX:
2037                 pci_disable_msix(enic->pdev);
2038                 break;
2039         case VNIC_DEV_INTR_MODE_MSI:
2040                 pci_disable_msi(enic->pdev);
2041                 break;
2042         default:
2043                 break;
2044         }
2045
2046         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2047 }
2048
2049 static const struct net_device_ops enic_netdev_dynamic_ops = {
2050         .ndo_open               = enic_open,
2051         .ndo_stop               = enic_stop,
2052         .ndo_start_xmit         = enic_hard_start_xmit,
2053         .ndo_get_stats64        = enic_get_stats,
2054         .ndo_validate_addr      = eth_validate_addr,
2055         .ndo_set_rx_mode        = enic_set_rx_mode,
2056         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2057         .ndo_change_mtu         = enic_change_mtu,
2058         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2059         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2060         .ndo_tx_timeout         = enic_tx_timeout,
2061         .ndo_set_vf_port        = enic_set_vf_port,
2062         .ndo_get_vf_port        = enic_get_vf_port,
2063         .ndo_set_vf_mac         = enic_set_vf_mac,
2064 #ifdef CONFIG_NET_POLL_CONTROLLER
2065         .ndo_poll_controller    = enic_poll_controller,
2066 #endif
2067 };
2068
2069 static const struct net_device_ops enic_netdev_ops = {
2070         .ndo_open               = enic_open,
2071         .ndo_stop               = enic_stop,
2072         .ndo_start_xmit         = enic_hard_start_xmit,
2073         .ndo_get_stats64        = enic_get_stats,
2074         .ndo_validate_addr      = eth_validate_addr,
2075         .ndo_set_mac_address    = enic_set_mac_address,
2076         .ndo_set_rx_mode        = enic_set_rx_mode,
2077         .ndo_change_mtu         = enic_change_mtu,
2078         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2079         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2080         .ndo_tx_timeout         = enic_tx_timeout,
2081         .ndo_set_vf_port        = enic_set_vf_port,
2082         .ndo_get_vf_port        = enic_get_vf_port,
2083         .ndo_set_vf_mac         = enic_set_vf_mac,
2084 #ifdef CONFIG_NET_POLL_CONTROLLER
2085         .ndo_poll_controller    = enic_poll_controller,
2086 #endif
2087 };
2088
2089 static void enic_dev_deinit(struct enic *enic)
2090 {
2091         unsigned int i;
2092
2093         for (i = 0; i < enic->rq_count; i++)
2094                 netif_napi_del(&enic->napi[i]);
2095
2096         enic_free_vnic_resources(enic);
2097         enic_clear_intr_mode(enic);
2098 }
2099
2100 static int enic_dev_init(struct enic *enic)
2101 {
2102         struct device *dev = enic_get_dev(enic);
2103         struct net_device *netdev = enic->netdev;
2104         unsigned int i;
2105         int err;
2106
2107         /* Get interrupt coalesce timer info */
2108         err = enic_dev_intr_coal_timer_info(enic);
2109         if (err) {
2110                 dev_warn(dev, "Using default conversion factor for "
2111                         "interrupt coalesce timer\n");
2112                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2113         }
2114
2115         /* Get vNIC configuration
2116          */
2117
2118         err = enic_get_vnic_config(enic);
2119         if (err) {
2120                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2121                 return err;
2122         }
2123
2124         /* Get available resource counts
2125          */
2126
2127         enic_get_res_counts(enic);
2128
2129         /* Set interrupt mode based on resource counts and system
2130          * capabilities
2131          */
2132
2133         err = enic_set_intr_mode(enic);
2134         if (err) {
2135                 dev_err(dev, "Failed to set intr mode based on resource "
2136                         "counts and system capabilities, aborting\n");
2137                 return err;
2138         }
2139
2140         /* Allocate and configure vNIC resources
2141          */
2142
2143         err = enic_alloc_vnic_resources(enic);
2144         if (err) {
2145                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2146                 goto err_out_free_vnic_resources;
2147         }
2148
2149         enic_init_vnic_resources(enic);
2150
2151         err = enic_set_rss_nic_cfg(enic);
2152         if (err) {
2153                 dev_err(dev, "Failed to config nic, aborting\n");
2154                 goto err_out_free_vnic_resources;
2155         }
2156
2157         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2158         default:
2159                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2160                 break;
2161         case VNIC_DEV_INTR_MODE_MSIX:
2162                 for (i = 0; i < enic->rq_count; i++)
2163                         netif_napi_add(netdev, &enic->napi[i],
2164                                 enic_poll_msix, 64);
2165                 break;
2166         }
2167
2168         return 0;
2169
2170 err_out_free_vnic_resources:
2171         enic_clear_intr_mode(enic);
2172         enic_free_vnic_resources(enic);
2173
2174         return err;
2175 }
2176
2177 static void enic_iounmap(struct enic *enic)
2178 {
2179         unsigned int i;
2180
2181         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2182                 if (enic->bar[i].vaddr)
2183                         iounmap(enic->bar[i].vaddr);
2184 }
2185
2186 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2187 {
2188         struct device *dev = &pdev->dev;
2189         struct net_device *netdev;
2190         struct enic *enic;
2191         int using_dac = 0;
2192         unsigned int i;
2193         int err;
2194 #ifdef CONFIG_PCI_IOV
2195         int pos = 0;
2196 #endif
2197         int num_pps = 1;
2198
2199         /* Allocate net device structure and initialize.  Private
2200          * instance data is initialized to zero.
2201          */
2202
2203         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2204                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2205         if (!netdev)
2206                 return -ENOMEM;
2207
2208         pci_set_drvdata(pdev, netdev);
2209
2210         SET_NETDEV_DEV(netdev, &pdev->dev);
2211
2212         enic = netdev_priv(netdev);
2213         enic->netdev = netdev;
2214         enic->pdev = pdev;
2215
2216         /* Setup PCI resources
2217          */
2218
2219         err = pci_enable_device_mem(pdev);
2220         if (err) {
2221                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2222                 goto err_out_free_netdev;
2223         }
2224
2225         err = pci_request_regions(pdev, DRV_NAME);
2226         if (err) {
2227                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2228                 goto err_out_disable_device;
2229         }
2230
2231         pci_set_master(pdev);
2232
2233         /* Query PCI controller on system for DMA addressing
2234          * limitation for the device.  Try 64-bit first, and
2235          * fail to 32-bit.
2236          */
2237
2238         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2239         if (err) {
2240                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2241                 if (err) {
2242                         dev_err(dev, "No usable DMA configuration, aborting\n");
2243                         goto err_out_release_regions;
2244                 }
2245                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2246                 if (err) {
2247                         dev_err(dev, "Unable to obtain %u-bit DMA "
2248                                 "for consistent allocations, aborting\n", 32);
2249                         goto err_out_release_regions;
2250                 }
2251         } else {
2252                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2253                 if (err) {
2254                         dev_err(dev, "Unable to obtain %u-bit DMA "
2255                                 "for consistent allocations, aborting\n", 64);
2256                         goto err_out_release_regions;
2257                 }
2258                 using_dac = 1;
2259         }
2260
2261         /* Map vNIC resources from BAR0-5
2262          */
2263
2264         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2265                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2266                         continue;
2267                 enic->bar[i].len = pci_resource_len(pdev, i);
2268                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2269                 if (!enic->bar[i].vaddr) {
2270                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2271                         err = -ENODEV;
2272                         goto err_out_iounmap;
2273                 }
2274                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2275         }
2276
2277         /* Register vNIC device
2278          */
2279
2280         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2281                 ARRAY_SIZE(enic->bar));
2282         if (!enic->vdev) {
2283                 dev_err(dev, "vNIC registration failed, aborting\n");
2284                 err = -ENODEV;
2285                 goto err_out_iounmap;
2286         }
2287
2288 #ifdef CONFIG_PCI_IOV
2289         /* Get number of subvnics */
2290         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2291         if (pos) {
2292                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2293                         &enic->num_vfs);
2294                 if (enic->num_vfs) {
2295                         err = pci_enable_sriov(pdev, enic->num_vfs);
2296                         if (err) {
2297                                 dev_err(dev, "SRIOV enable failed, aborting."
2298                                         " pci_enable_sriov() returned %d\n",
2299                                         err);
2300                                 goto err_out_vnic_unregister;
2301                         }
2302                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2303                         num_pps = enic->num_vfs;
2304                 }
2305         }
2306 #endif
2307
2308         /* Allocate structure for port profiles */
2309         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2310         if (!enic->pp) {
2311                 err = -ENOMEM;
2312                 goto err_out_disable_sriov_pp;
2313         }
2314
2315         /* Issue device open to get device in known state
2316          */
2317
2318         err = enic_dev_open(enic);
2319         if (err) {
2320                 dev_err(dev, "vNIC dev open failed, aborting\n");
2321                 goto err_out_disable_sriov;
2322         }
2323
2324         /* Setup devcmd lock
2325          */
2326
2327         spin_lock_init(&enic->devcmd_lock);
2328         spin_lock_init(&enic->enic_api_lock);
2329
2330         /*
2331          * Set ingress vlan rewrite mode before vnic initialization
2332          */
2333
2334         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2335         if (err) {
2336                 dev_err(dev,
2337                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2338                 goto err_out_dev_close;
2339         }
2340
2341         /* Issue device init to initialize the vnic-to-switch link.
2342          * We'll start with carrier off and wait for link UP
2343          * notification later to turn on carrier.  We don't need
2344          * to wait here for the vnic-to-switch link initialization
2345          * to complete; link UP notification is the indication that
2346          * the process is complete.
2347          */
2348
2349         netif_carrier_off(netdev);
2350
2351         /* Do not call dev_init for a dynamic vnic.
2352          * For a dynamic vnic, init_prov_info will be
2353          * called later by an upper layer.
2354          */
2355
2356         if (!enic_is_dynamic(enic)) {
2357                 err = vnic_dev_init(enic->vdev, 0);
2358                 if (err) {
2359                         dev_err(dev, "vNIC dev init failed, aborting\n");
2360                         goto err_out_dev_close;
2361                 }
2362         }
2363
2364         err = enic_dev_init(enic);
2365         if (err) {
2366                 dev_err(dev, "Device initialization failed, aborting\n");
2367                 goto err_out_dev_close;
2368         }
2369
2370         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2371         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2372
2373         /* Setup notification timer, HW reset task, and wq locks
2374          */
2375
2376         init_timer(&enic->notify_timer);
2377         enic->notify_timer.function = enic_notify_timer;
2378         enic->notify_timer.data = (unsigned long)enic;
2379
2380         enic_set_rx_coal_setting(enic);
2381         INIT_WORK(&enic->reset, enic_reset);
2382         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2383
2384         for (i = 0; i < enic->wq_count; i++)
2385                 spin_lock_init(&enic->wq_lock[i]);
2386
2387         /* Register net device
2388          */
2389
2390         enic->port_mtu = enic->config.mtu;
2391         (void)enic_change_mtu(netdev, enic->port_mtu);
2392
2393         err = enic_set_mac_addr(netdev, enic->mac_addr);
2394         if (err) {
2395                 dev_err(dev, "Invalid MAC address, aborting\n");
2396                 goto err_out_dev_deinit;
2397         }
2398
2399         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2400         /* rx coalesce time already got initialized. This gets used
2401          * if adaptive coal is turned off
2402          */
2403         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2404
2405         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2406                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2407         else
2408                 netdev->netdev_ops = &enic_netdev_ops;
2409
2410         netdev->watchdog_timeo = 2 * HZ;
2411         enic_set_ethtool_ops(netdev);
2412
2413         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2414         if (ENIC_SETTING(enic, LOOP)) {
2415                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2416                 enic->loop_enable = 1;
2417                 enic->loop_tag = enic->config.loop_tag;
2418                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2419         }
2420         if (ENIC_SETTING(enic, TXCSUM))
2421                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2422         if (ENIC_SETTING(enic, TSO))
2423                 netdev->hw_features |= NETIF_F_TSO |
2424                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2425         if (ENIC_SETTING(enic, RSS))
2426                 netdev->hw_features |= NETIF_F_RXHASH;
2427         if (ENIC_SETTING(enic, RXCSUM))
2428                 netdev->hw_features |= NETIF_F_RXCSUM;
2429
2430         netdev->features |= netdev->hw_features;
2431
2432         if (using_dac)
2433                 netdev->features |= NETIF_F_HIGHDMA;
2434
2435         netdev->priv_flags |= IFF_UNICAST_FLT;
2436
2437         err = register_netdev(netdev);
2438         if (err) {
2439                 dev_err(dev, "Cannot register net device, aborting\n");
2440                 goto err_out_dev_deinit;
2441         }
2442
2443         return 0;
2444
2445 err_out_dev_deinit:
2446         enic_dev_deinit(enic);
2447 err_out_dev_close:
2448         vnic_dev_close(enic->vdev);
2449 err_out_disable_sriov:
2450         kfree(enic->pp);
2451 err_out_disable_sriov_pp:
2452 #ifdef CONFIG_PCI_IOV
2453         if (enic_sriov_enabled(enic)) {
2454                 pci_disable_sriov(pdev);
2455                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2456         }
2457 err_out_vnic_unregister:
2458 #endif
2459         vnic_dev_unregister(enic->vdev);
2460 err_out_iounmap:
2461         enic_iounmap(enic);
2462 err_out_release_regions:
2463         pci_release_regions(pdev);
2464 err_out_disable_device:
2465         pci_disable_device(pdev);
2466 err_out_free_netdev:
2467         free_netdev(netdev);
2468
2469         return err;
2470 }
2471
2472 static void enic_remove(struct pci_dev *pdev)
2473 {
2474         struct net_device *netdev = pci_get_drvdata(pdev);
2475
2476         if (netdev) {
2477                 struct enic *enic = netdev_priv(netdev);
2478
2479                 cancel_work_sync(&enic->reset);
2480                 cancel_work_sync(&enic->change_mtu_work);
2481                 unregister_netdev(netdev);
2482                 enic_dev_deinit(enic);
2483                 vnic_dev_close(enic->vdev);
2484 #ifdef CONFIG_PCI_IOV
2485                 if (enic_sriov_enabled(enic)) {
2486                         pci_disable_sriov(pdev);
2487                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2488                 }
2489 #endif
2490                 kfree(enic->pp);
2491                 vnic_dev_unregister(enic->vdev);
2492                 enic_iounmap(enic);
2493                 pci_release_regions(pdev);
2494                 pci_disable_device(pdev);
2495                 free_netdev(netdev);
2496         }
2497 }
2498
2499 static struct pci_driver enic_driver = {
2500         .name = DRV_NAME,
2501         .id_table = enic_id_table,
2502         .probe = enic_probe,
2503         .remove = enic_remove,
2504 };
2505
2506 static int __init enic_init_module(void)
2507 {
2508         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2509
2510         return pci_register_driver(&enic_driver);
2511 }
2512
2513 static void __exit enic_cleanup_module(void)
2514 {
2515         pci_unregister_driver(&enic_driver);
2516 }
2517
2518 module_init(enic_init_module);
2519 module_exit(enic_cleanup_module);