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 #ifdef CONFIG_RFS_ACCEL
  43 #include <linux/cpu_rmap.h>
  44 #endif
  45 #ifdef CONFIG_NET_RX_BUSY_POLL
  46 #include <net/busy_poll.h>
  47 #endif
  48
  49 #include "cq_enet_desc.h"
  50 #include "vnic_dev.h"
  51 #include "vnic_intr.h"
  52 #include "vnic_stats.h"
  53 #include "vnic_vic.h"
  54 #include "enic_res.h"
  55 #include "enic.h"
  56 #include "enic_dev.h"
  57 #include "enic_pp.h"
  58 #include "enic_clsf.h"
  59
  60 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  61 #define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  62 #define MAX_TSO                         (1 << 16)
  63 #define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  64
  65 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  66 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
  67 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
  68
  69 /* Supported devices */
  70 static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
  71         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  72         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
  73         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
  74         { 0, }  /* end of table */
  75 };
  76
  77 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  78 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  79 MODULE_LICENSE("GPL");
  80 MODULE_VERSION(DRV_VERSION);
  81 MODULE_DEVICE_TABLE(pci, enic_id_table);
  82
  83 #define ENIC_LARGE_PKT_THRESHOLD                1000
  84 #define ENIC_MAX_COALESCE_TIMERS                10
  85 /*  Interrupt moderation table, which will be used to decide the
  86  *  coalescing timer values
  87  *  {rx_rate in Mbps, mapping percentage of the range}
  88  */
  89 struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
  90         {4000,  0},
  91         {4400, 10},
  92         {5060, 20},
  93         {5230, 30},
  94         {5540, 40},
  95         {5820, 50},
  96         {6120, 60},
  97         {6435, 70},
  98         {6745, 80},
  99         {7000, 90},
 100         {0xFFFFFFFF, 100}
 101 };
 102
 103 /* This table helps the driver to pick different ranges for rx coalescing
 104  * timer depending on the link speed.
 105  */
 106 struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
 107         {0,  0}, /* 0  - 4  Gbps */
 108         {0,  3}, /* 4  - 10 Gbps */
 109         {3,  6}, /* 10 - 40 Gbps */
 110 };
 111
 112 int enic_is_dynamic(struct enic *enic)
 113 {
 114         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 115 }
 116
 117 int enic_sriov_enabled(struct enic *enic)
 118 {
 119         return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 120 }
 121
 122 static int enic_is_sriov_vf(struct enic *enic)
 123 {
 124         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 125 }
 126
 127 int enic_is_valid_vf(struct enic *enic, int vf)
 128 {
 129 #ifdef CONFIG_PCI_IOV
 130         return vf >= 0 && vf < enic->num_vfs;
 131 #else
 132         return 0;
 133 #endif
 134 }
 135
 136 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 137 {
 138         struct enic *enic = vnic_dev_priv(wq->vdev);
 139
 140         if (buf->sop)
 141                 pci_unmap_single(enic->pdev, buf->dma_addr,
 142                         buf->len, PCI_DMA_TODEVICE);
 143         else
 144                 pci_unmap_page(enic->pdev, buf->dma_addr,
 145                         buf->len, PCI_DMA_TODEVICE);
 146
 147         if (buf->os_buf)
 148                 dev_kfree_skb_any(buf->os_buf);
 149 }
 150
 151 static void enic_wq_free_buf(struct vnic_wq *wq,
 152         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 153 {
 154         enic_free_wq_buf(wq, buf);
 155 }
 156
 157 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 158         u8 type, u16 q_number, u16 completed_index, void *opaque)
 159 {
 160         struct enic *enic = vnic_dev_priv(vdev);
 161
 162         spin_lock(&enic->wq_lock[q_number]);
 163
 164         vnic_wq_service(&enic->wq[q_number], cq_desc,
 165                 completed_index, enic_wq_free_buf,
 166                 opaque);
 167
 168         if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 169             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 170             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 171                 netif_wake_subqueue(enic->netdev, q_number);
 172
 173         spin_unlock(&enic->wq_lock[q_number]);
 174
 175         return 0;
 176 }
 177
 178 static void enic_log_q_error(struct enic *enic)
 179 {
 180         unsigned int i;
 181         u32 error_status;
 182
 183         for (i = 0; i < enic->wq_count; i++) {
 184                 error_status = vnic_wq_error_status(&enic->wq[i]);
 185                 if (error_status)
 186                         netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 187                                 i, error_status);
 188         }
 189
 190         for (i = 0; i < enic->rq_count; i++) {
 191                 error_status = vnic_rq_error_status(&enic->rq[i]);
 192                 if (error_status)
 193                         netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 194                                 i, error_status);
 195         }
 196 }
 197
 198 static void enic_msglvl_check(struct enic *enic)
 199 {
 200         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 201
 202         if (msg_enable != enic->msg_enable) {
 203                 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 204                         enic->msg_enable, msg_enable);
 205                 enic->msg_enable = msg_enable;
 206         }
 207 }
 208
 209 static void enic_mtu_check(struct enic *enic)
 210 {
 211         u32 mtu = vnic_dev_mtu(enic->vdev);
 212         struct net_device *netdev = enic->netdev;
 213
 214         if (mtu && mtu != enic->port_mtu) {
 215                 enic->port_mtu = mtu;
 216                 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 217                         mtu = max_t(int, ENIC_MIN_MTU,
 218                                 min_t(int, ENIC_MAX_MTU, mtu));
 219                         if (mtu != netdev->mtu)
 220                                 schedule_work(&enic->change_mtu_work);
 221                 } else {
 222                         if (mtu < netdev->mtu)
 223                                 netdev_warn(netdev,
 224                                         "interface MTU (%d) set higher "
 225                                         "than switch port MTU (%d)\n",
 226                                         netdev->mtu, mtu);
 227                 }
 228         }
 229 }
 230
 231 static void enic_link_check(struct enic *enic)
 232 {
 233         int link_status = vnic_dev_link_status(enic->vdev);
 234         int carrier_ok = netif_carrier_ok(enic->netdev);
 235
 236         if (link_status && !carrier_ok) {
 237                 netdev_info(enic->netdev, "Link UP\n");
 238                 netif_carrier_on(enic->netdev);
 239         } else if (!link_status && carrier_ok) {
 240                 netdev_info(enic->netdev, "Link DOWN\n");
 241                 netif_carrier_off(enic->netdev);
 242         }
 243 }
 244
 245 static void enic_notify_check(struct enic *enic)
 246 {
 247         enic_msglvl_check(enic);
 248         enic_mtu_check(enic);
 249         enic_link_check(enic);
 250 }
 251
 252 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 253
 254 static irqreturn_t enic_isr_legacy(int irq, void *data)
 255 {
 256         struct net_device *netdev = data;
 257         struct enic *enic = netdev_priv(netdev);
 258         unsigned int io_intr = enic_legacy_io_intr();
 259         unsigned int err_intr = enic_legacy_err_intr();
 260         unsigned int notify_intr = enic_legacy_notify_intr();
 261         u32 pba;
 262
 263         vnic_intr_mask(&enic->intr[io_intr]);
 264
 265         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 266         if (!pba) {
 267                 vnic_intr_unmask(&enic->intr[io_intr]);
 268                 return IRQ_NONE;        /* not our interrupt */
 269         }
 270
 271         if (ENIC_TEST_INTR(pba, notify_intr)) {
 272                 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 273                 enic_notify_check(enic);
 274         }
 275
 276         if (ENIC_TEST_INTR(pba, err_intr)) {
 277                 vnic_intr_return_all_credits(&enic->intr[err_intr]);
 278                 enic_log_q_error(enic);
 279                 /* schedule recovery from WQ/RQ error */
 280                 schedule_work(&enic->reset);
 281                 return IRQ_HANDLED;
 282         }
 283
 284         if (ENIC_TEST_INTR(pba, io_intr)) {
 285                 if (napi_schedule_prep(&enic->napi[0]))
 286                         __napi_schedule(&enic->napi[0]);
 287         } else {
 288                 vnic_intr_unmask(&enic->intr[io_intr]);
 289         }
 290
 291         return IRQ_HANDLED;
 292 }
 293
 294 static irqreturn_t enic_isr_msi(int irq, void *data)
 295 {
 296         struct enic *enic = data;
 297
 298         /* With MSI, there is no sharing of interrupts, so this is
 299          * our interrupt and there is no need to ack it.  The device
 300          * is not providing per-vector masking, so the OS will not
 301          * write to PCI config space to mask/unmask the interrupt.
 302          * We're using mask_on_assertion for MSI, so the device
 303          * automatically masks the interrupt when the interrupt is
 304          * generated.  Later, when exiting polling, the interrupt
 305          * will be unmasked (see enic_poll).
 306          *
 307          * Also, the device uses the same PCIe Traffic Class (TC)
 308          * for Memory Write data and MSI, so there are no ordering
 309          * issues; the MSI will always arrive at the Root Complex
 310          * _after_ corresponding Memory Writes (i.e. descriptor
 311          * writes).
 312          */
 313
 314         napi_schedule(&enic->napi[0]);
 315
 316         return IRQ_HANDLED;
 317 }
 318
 319 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
 320 {
 321         struct napi_struct *napi = data;
 322
 323         /* schedule NAPI polling for RQ cleanup */
 324         napi_schedule(napi);
 325
 326         return IRQ_HANDLED;
 327 }
 328
 329 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
 330 {
 331         struct enic *enic = data;
 332         unsigned int cq;
 333         unsigned int intr;
 334         unsigned int wq_work_to_do = -1; /* no limit */
 335         unsigned int wq_work_done;
 336         unsigned int wq_irq;
 337
 338         wq_irq = (u32)irq - enic->msix_entry[enic_msix_wq_intr(enic, 0)].vector;
 339         cq = enic_cq_wq(enic, wq_irq);
 340         intr = enic_msix_wq_intr(enic, wq_irq);
 341
 342         wq_work_done = vnic_cq_service(&enic->cq[cq],
 343                 wq_work_to_do, enic_wq_service, NULL);
 344
 345         vnic_intr_return_credits(&enic->intr[intr],
 346                 wq_work_done,
 347                 1 /* unmask intr */,
 348                 1 /* reset intr timer */);
 349
 350         return IRQ_HANDLED;
 351 }
 352
 353 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 354 {
 355         struct enic *enic = data;
 356         unsigned int intr = enic_msix_err_intr(enic);
 357
 358         vnic_intr_return_all_credits(&enic->intr[intr]);
 359
 360         enic_log_q_error(enic);
 361
 362         /* schedule recovery from WQ/RQ error */
 363         schedule_work(&enic->reset);
 364
 365         return IRQ_HANDLED;
 366 }
 367
 368 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 369 {
 370         struct enic *enic = data;
 371         unsigned int intr = enic_msix_notify_intr(enic);
 372
 373         vnic_intr_return_all_credits(&enic->intr[intr]);
 374         enic_notify_check(enic);
 375
 376         return IRQ_HANDLED;
 377 }
 378
 379 static inline void enic_queue_wq_skb_cont(struct enic *enic,
 380         struct vnic_wq *wq, struct sk_buff *skb,
 381         unsigned int len_left, int loopback)
 382 {
 383         const skb_frag_t *frag;
 384
 385         /* Queue additional data fragments */
 386         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 387                 len_left -= skb_frag_size(frag);
 388                 enic_queue_wq_desc_cont(wq, skb,
 389                         skb_frag_dma_map(&enic->pdev->dev,
 390                                          frag, 0, skb_frag_size(frag),
 391                                          DMA_TO_DEVICE),
 392                         skb_frag_size(frag),
 393                         (len_left == 0),        /* EOP? */
 394                         loopback);
 395         }
 396 }
 397
 398 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
 399         struct vnic_wq *wq, struct sk_buff *skb,
 400         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 401 {
 402         unsigned int head_len = skb_headlen(skb);
 403         unsigned int len_left = skb->len - head_len;
 404         int eop = (len_left == 0);
 405
 406         /* Queue the main skb fragment. The fragments are no larger
 407          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 408          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 409          * per fragment is queued.
 410          */
 411         enic_queue_wq_desc(wq, skb,
 412                 pci_map_single(enic->pdev, skb->data,
 413                         head_len, PCI_DMA_TODEVICE),
 414                 head_len,
 415                 vlan_tag_insert, vlan_tag,
 416                 eop, loopback);
 417
 418         if (!eop)
 419                 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 420 }
 421
 422 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
 423         struct vnic_wq *wq, struct sk_buff *skb,
 424         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 425 {
 426         unsigned int head_len = skb_headlen(skb);
 427         unsigned int len_left = skb->len - head_len;
 428         unsigned int hdr_len = skb_checksum_start_offset(skb);
 429         unsigned int csum_offset = hdr_len + skb->csum_offset;
 430         int eop = (len_left == 0);
 431
 432         /* Queue the main skb fragment. The fragments are no larger
 433          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 434          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 435          * per fragment is queued.
 436          */
 437         enic_queue_wq_desc_csum_l4(wq, skb,
 438                 pci_map_single(enic->pdev, skb->data,
 439                         head_len, PCI_DMA_TODEVICE),
 440                 head_len,
 441                 csum_offset,
 442                 hdr_len,
 443                 vlan_tag_insert, vlan_tag,
 444                 eop, loopback);
 445
 446         if (!eop)
 447                 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 448 }
 449
 450 static inline void enic_queue_wq_skb_tso(struct enic *enic,
 451         struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
 452         int vlan_tag_insert, unsigned int vlan_tag, int loopback)
 453 {
 454         unsigned int frag_len_left = skb_headlen(skb);
 455         unsigned int len_left = skb->len - frag_len_left;
 456         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 457         int eop = (len_left == 0);
 458         unsigned int len;
 459         dma_addr_t dma_addr;
 460         unsigned int offset = 0;
 461         skb_frag_t *frag;
 462
 463         /* Preload TCP csum field with IP pseudo hdr calculated
 464          * with IP length set to zero.  HW will later add in length
 465          * to each TCP segment resulting from the TSO.
 466          */
 467
 468         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 469                 ip_hdr(skb)->check = 0;
 470                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 471                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 472         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 473                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 474                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 475         }
 476
 477         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 478          * for the main skb fragment
 479          */
 480         while (frag_len_left) {
 481                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 482                 dma_addr = pci_map_single(enic->pdev, skb->data + offset,
 483                                 len, PCI_DMA_TODEVICE);
 484                 enic_queue_wq_desc_tso(wq, skb,
 485                         dma_addr,
 486                         len,
 487                         mss, hdr_len,
 488                         vlan_tag_insert, vlan_tag,
 489                         eop && (len == frag_len_left), loopback);
 490                 frag_len_left -= len;
 491                 offset += len;
 492         }
 493
 494         if (eop)
 495                 return;
 496
 497         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 498          * for additional data fragments
 499          */
 500         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 501                 len_left -= skb_frag_size(frag);
 502                 frag_len_left = skb_frag_size(frag);
 503                 offset = 0;
 504
 505                 while (frag_len_left) {
 506                         len = min(frag_len_left,
 507                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 508                         dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 509                                                     offset, len,
 510                                                     DMA_TO_DEVICE);
 511                         enic_queue_wq_desc_cont(wq, skb,
 512                                 dma_addr,
 513                                 len,
 514                                 (len_left == 0) &&
 515                                 (len == frag_len_left),         /* EOP? */
 516                                 loopback);
 517                         frag_len_left -= len;
 518                         offset += len;
 519                 }
 520         }
 521 }
 522
 523 static inline void enic_queue_wq_skb(struct enic *enic,
 524         struct vnic_wq *wq, struct sk_buff *skb)
 525 {
 526         unsigned int mss = skb_shinfo(skb)->gso_size;
 527         unsigned int vlan_tag = 0;
 528         int vlan_tag_insert = 0;
 529         int loopback = 0;
 530
 531         if (vlan_tx_tag_present(skb)) {
 532                 /* VLAN tag from trunking driver */
 533                 vlan_tag_insert = 1;
 534                 vlan_tag = vlan_tx_tag_get(skb);
 535         } else if (enic->loop_enable) {
 536                 vlan_tag = enic->loop_tag;
 537                 loopback = 1;
 538         }
 539
 540         if (mss)
 541                 enic_queue_wq_skb_tso(enic, wq, skb, mss,
 542                         vlan_tag_insert, vlan_tag, loopback);
 543         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 544                 enic_queue_wq_skb_csum_l4(enic, wq, skb,
 545                         vlan_tag_insert, vlan_tag, loopback);
 546         else
 547                 enic_queue_wq_skb_vlan(enic, wq, skb,
 548                         vlan_tag_insert, vlan_tag, loopback);
 549 }
 550
 551 /* netif_tx_lock held, process context with BHs disabled, or BH */
 552 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 553         struct net_device *netdev)
 554 {
 555         struct enic *enic = netdev_priv(netdev);
 556         struct vnic_wq *wq;
 557         unsigned long flags;
 558         unsigned int txq_map;
 559
 560         if (skb->len <= 0) {
 561                 dev_kfree_skb_any(skb);
 562                 return NETDEV_TX_OK;
 563         }
 564
 565         txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 566         wq = &enic->wq[txq_map];
 567
 568         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 569          * which is very likely.  In the off chance it's going to take
 570          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 571          */
 572
 573         if (skb_shinfo(skb)->gso_size == 0 &&
 574             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 575             skb_linearize(skb)) {
 576                 dev_kfree_skb_any(skb);
 577                 return NETDEV_TX_OK;
 578         }
 579
 580         spin_lock_irqsave(&enic->wq_lock[txq_map], flags);
 581
 582         if (vnic_wq_desc_avail(wq) <
 583             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 584                 netif_tx_stop_queue(netdev_get_tx_queue(netdev, txq_map));
 585                 /* This is a hard error, log it */
 586                 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 587                 spin_unlock_irqrestore(&enic->wq_lock[txq_map], flags);
 588                 return NETDEV_TX_BUSY;
 589         }
 590
 591         enic_queue_wq_skb(enic, wq, skb);
 592
 593         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 594                 netif_tx_stop_queue(netdev_get_tx_queue(netdev, txq_map));
 595
 596         spin_unlock_irqrestore(&enic->wq_lock[txq_map], flags);
 597
 598         return NETDEV_TX_OK;
 599 }
 600
 601 /* dev_base_lock rwlock held, nominally process context */
 602 static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
 603                                                 struct rtnl_link_stats64 *net_stats)
 604 {
 605         struct enic *enic = netdev_priv(netdev);
 606         struct vnic_stats *stats;
 607
 608         enic_dev_stats_dump(enic, &stats);
 609
 610         net_stats->tx_packets = stats->tx.tx_frames_ok;
 611         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 612         net_stats->tx_errors = stats->tx.tx_errors;
 613         net_stats->tx_dropped = stats->tx.tx_drops;
 614
 615         net_stats->rx_packets = stats->rx.rx_frames_ok;
 616         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 617         net_stats->rx_errors = stats->rx.rx_errors;
 618         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 619         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 620         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 621         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 622
 623         return net_stats;
 624 }
 625
 626 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 627 {
 628         struct enic *enic = netdev_priv(netdev);
 629
 630         if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 631                 unsigned int mc_count = netdev_mc_count(netdev);
 632
 633                 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 634                             ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 635
 636                 return -ENOSPC;
 637         }
 638
 639         enic_dev_add_addr(enic, mc_addr);
 640         enic->mc_count++;
 641
 642         return 0;
 643 }
 644
 645 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 646 {
 647         struct enic *enic = netdev_priv(netdev);
 648
 649         enic_dev_del_addr(enic, mc_addr);
 650         enic->mc_count--;
 651
 652         return 0;
 653 }
 654
 655 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 656 {
 657         struct enic *enic = netdev_priv(netdev);
 658
 659         if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 660                 unsigned int uc_count = netdev_uc_count(netdev);
 661
 662                 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 663                             ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 664
 665                 return -ENOSPC;
 666         }
 667
 668         enic_dev_add_addr(enic, uc_addr);
 669         enic->uc_count++;
 670
 671         return 0;
 672 }
 673
 674 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 675 {
 676         struct enic *enic = netdev_priv(netdev);
 677
 678         enic_dev_del_addr(enic, uc_addr);
 679         enic->uc_count--;
 680
 681         return 0;
 682 }
 683
 684 void enic_reset_addr_lists(struct enic *enic)
 685 {
 686         struct net_device *netdev = enic->netdev;
 687
 688         __dev_uc_unsync(netdev, NULL);
 689         __dev_mc_unsync(netdev, NULL);
 690
 691         enic->mc_count = 0;
 692         enic->uc_count = 0;
 693         enic->flags = 0;
 694 }
 695
 696 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 697 {
 698         struct enic *enic = netdev_priv(netdev);
 699
 700         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 701                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 702                         return -EADDRNOTAVAIL;
 703         } else {
 704                 if (!is_valid_ether_addr(addr))
 705                         return -EADDRNOTAVAIL;
 706         }
 707
 708         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 709
 710         return 0;
 711 }
 712
 713 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 714 {
 715         struct enic *enic = netdev_priv(netdev);
 716         struct sockaddr *saddr = p;
 717         char *addr = saddr->sa_data;
 718         int err;
 719
 720         if (netif_running(enic->netdev)) {
 721                 err = enic_dev_del_station_addr(enic);
 722                 if (err)
 723                         return err;
 724         }
 725
 726         err = enic_set_mac_addr(netdev, addr);
 727         if (err)
 728                 return err;
 729
 730         if (netif_running(enic->netdev)) {
 731                 err = enic_dev_add_station_addr(enic);
 732                 if (err)
 733                         return err;
 734         }
 735
 736         return err;
 737 }
 738
 739 static int enic_set_mac_address(struct net_device *netdev, void *p)
 740 {
 741         struct sockaddr *saddr = p;
 742         char *addr = saddr->sa_data;
 743         struct enic *enic = netdev_priv(netdev);
 744         int err;
 745
 746         err = enic_dev_del_station_addr(enic);
 747         if (err)
 748                 return err;
 749
 750         err = enic_set_mac_addr(netdev, addr);
 751         if (err)
 752                 return err;
 753
 754         return enic_dev_add_station_addr(enic);
 755 }
 756
 757 /* netif_tx_lock held, BHs disabled */
 758 static void enic_set_rx_mode(struct net_device *netdev)
 759 {
 760         struct enic *enic = netdev_priv(netdev);
 761         int directed = 1;
 762         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 763         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 764         int promisc = (netdev->flags & IFF_PROMISC) ||
 765                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
 766         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 767                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
 768         unsigned int flags = netdev->flags |
 769                 (allmulti ? IFF_ALLMULTI : 0) |
 770                 (promisc ? IFF_PROMISC : 0);
 771
 772         if (enic->flags != flags) {
 773                 enic->flags = flags;
 774                 enic_dev_packet_filter(enic, directed,
 775                         multicast, broadcast, promisc, allmulti);
 776         }
 777
 778         if (!promisc) {
 779                 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
 780                 if (!allmulti)
 781                         __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
 782         }
 783 }
 784
 785 /* netif_tx_lock held, BHs disabled */
 786 static void enic_tx_timeout(struct net_device *netdev)
 787 {
 788         struct enic *enic = netdev_priv(netdev);
 789         schedule_work(&enic->reset);
 790 }
 791
 792 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 793 {
 794         struct enic *enic = netdev_priv(netdev);
 795         struct enic_port_profile *pp;
 796         int err;
 797
 798         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 799         if (err)
 800                 return err;
 801
 802         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 803                 if (vf == PORT_SELF_VF) {
 804                         memcpy(pp->vf_mac, mac, ETH_ALEN);
 805                         return 0;
 806                 } else {
 807                         /*
 808                          * For sriov vf's set the mac in hw
 809                          */
 810                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 811                                 vnic_dev_set_mac_addr, mac);
 812                         return enic_dev_status_to_errno(err);
 813                 }
 814         } else
 815                 return -EINVAL;
 816 }
 817
 818 static int enic_set_vf_port(struct net_device *netdev, int vf,
 819         struct nlattr *port[])
 820 {
 821         struct enic *enic = netdev_priv(netdev);
 822         struct enic_port_profile prev_pp;
 823         struct enic_port_profile *pp;
 824         int err = 0, restore_pp = 1;
 825
 826         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 827         if (err)
 828                 return err;
 829
 830         if (!port[IFLA_PORT_REQUEST])
 831                 return -EOPNOTSUPP;
 832
 833         memcpy(&prev_pp, pp, sizeof(*enic->pp));
 834         memset(pp, 0, sizeof(*enic->pp));
 835
 836         pp->set |= ENIC_SET_REQUEST;
 837         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
 838
 839         if (port[IFLA_PORT_PROFILE]) {
 840                 pp->set |= ENIC_SET_NAME;
 841                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
 842                         PORT_PROFILE_MAX);
 843         }
 844
 845         if (port[IFLA_PORT_INSTANCE_UUID]) {
 846                 pp->set |= ENIC_SET_INSTANCE;
 847                 memcpy(pp->instance_uuid,
 848                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
 849         }
 850
 851         if (port[IFLA_PORT_HOST_UUID]) {
 852                 pp->set |= ENIC_SET_HOST;
 853                 memcpy(pp->host_uuid,
 854                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
 855         }
 856
 857         if (vf == PORT_SELF_VF) {
 858                 /* Special case handling: mac came from IFLA_VF_MAC */
 859                 if (!is_zero_ether_addr(prev_pp.vf_mac))
 860                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
 861
 862                 if (is_zero_ether_addr(netdev->dev_addr))
 863                         eth_hw_addr_random(netdev);
 864         } else {
 865                 /* SR-IOV VF: get mac from adapter */
 866                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 867                         vnic_dev_get_mac_addr, pp->mac_addr);
 868                 if (err) {
 869                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
 870                         memcpy(pp, &prev_pp, sizeof(*pp));
 871                         return enic_dev_status_to_errno(err);
 872                 }
 873         }
 874
 875         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
 876         if (err) {
 877                 if (restore_pp) {
 878                         /* Things are still the way they were: Implicit
 879                          * DISASSOCIATE failed
 880                          */
 881                         memcpy(pp, &prev_pp, sizeof(*pp));
 882                 } else {
 883                         memset(pp, 0, sizeof(*pp));
 884                         if (vf == PORT_SELF_VF)
 885                                 memset(netdev->dev_addr, 0, ETH_ALEN);
 886                 }
 887         } else {
 888                 /* Set flag to indicate that the port assoc/disassoc
 889                  * request has been sent out to fw
 890                  */
 891                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
 892
 893                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
 894                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
 895                         memset(pp->mac_addr, 0, ETH_ALEN);
 896                         if (vf == PORT_SELF_VF)
 897                                 memset(netdev->dev_addr, 0, ETH_ALEN);
 898                 }
 899         }
 900
 901         if (vf == PORT_SELF_VF)
 902                 memset(pp->vf_mac, 0, ETH_ALEN);
 903
 904         return err;
 905 }
 906
 907 static int enic_get_vf_port(struct net_device *netdev, int vf,
 908         struct sk_buff *skb)
 909 {
 910         struct enic *enic = netdev_priv(netdev);
 911         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
 912         struct enic_port_profile *pp;
 913         int err;
 914
 915         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 916         if (err)
 917                 return err;
 918
 919         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
 920                 return -ENODATA;
 921
 922         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
 923         if (err)
 924                 return err;
 925
 926         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
 927             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
 928             ((pp->set & ENIC_SET_NAME) &&
 929              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
 930             ((pp->set & ENIC_SET_INSTANCE) &&
 931              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
 932                      pp->instance_uuid)) ||
 933             ((pp->set & ENIC_SET_HOST) &&
 934              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
 935                 goto nla_put_failure;
 936         return 0;
 937
 938 nla_put_failure:
 939         return -EMSGSIZE;
 940 }
 941
 942 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 943 {
 944         struct enic *enic = vnic_dev_priv(rq->vdev);
 945
 946         if (!buf->os_buf)
 947                 return;
 948
 949         pci_unmap_single(enic->pdev, buf->dma_addr,
 950                 buf->len, PCI_DMA_FROMDEVICE);
 951         dev_kfree_skb_any(buf->os_buf);
 952 }
 953
 954 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 955 {
 956         struct enic *enic = vnic_dev_priv(rq->vdev);
 957         struct net_device *netdev = enic->netdev;
 958         struct sk_buff *skb;
 959         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
 960         unsigned int os_buf_index = 0;
 961         dma_addr_t dma_addr;
 962
 963         skb = netdev_alloc_skb_ip_align(netdev, len);
 964         if (!skb)
 965                 return -ENOMEM;
 966
 967         dma_addr = pci_map_single(enic->pdev, skb->data,
 968                 len, PCI_DMA_FROMDEVICE);
 969
 970         enic_queue_rq_desc(rq, skb, os_buf_index,
 971                 dma_addr, len);
 972
 973         return 0;
 974 }
 975
 976 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
 977                                       u32 pkt_len)
 978 {
 979         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
 980                 pkt_size->large_pkt_bytes_cnt += pkt_len;
 981         else
 982                 pkt_size->small_pkt_bytes_cnt += pkt_len;
 983 }
 984
 985 static void enic_rq_indicate_buf(struct vnic_rq *rq,
 986         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
 987         int skipped, void *opaque)
 988 {
 989         struct enic *enic = vnic_dev_priv(rq->vdev);
 990         struct net_device *netdev = enic->netdev;
 991         struct sk_buff *skb;
 992         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
 993
 994         u8 type, color, eop, sop, ingress_port, vlan_stripped;
 995         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
 996         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
 997         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
 998         u8 packet_error;
 999         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1000         u32 rss_hash;
1001
1002         if (skipped)
1003                 return;
1004
1005         skb = buf->os_buf;
1006         prefetch(skb->data - NET_IP_ALIGN);
1007         pci_unmap_single(enic->pdev, buf->dma_addr,
1008                 buf->len, PCI_DMA_FROMDEVICE);
1009
1010         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1011                 &type, &color, &q_number, &completed_index,
1012                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1013                 &csum_not_calc, &rss_hash, &bytes_written,
1014                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1015                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1016                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1017                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1018                 &fcs_ok);
1019
1020         if (packet_error) {
1021
1022                 if (!fcs_ok) {
1023                         if (bytes_written > 0)
1024                                 enic->rq_bad_fcs++;
1025                         else if (bytes_written == 0)
1026                                 enic->rq_truncated_pkts++;
1027                 }
1028
1029                 dev_kfree_skb_any(skb);
1030
1031                 return;
1032         }
1033
1034         if (eop && bytes_written > 0) {
1035
1036                 /* Good receive
1037                  */
1038
1039                 skb_put(skb, bytes_written);
1040                 skb->protocol = eth_type_trans(skb, netdev);
1041                 skb_record_rx_queue(skb, q_number);
1042                 if (netdev->features & NETIF_F_RXHASH) {
1043                         skb_set_hash(skb, rss_hash,
1044                                      (rss_type &
1045                                       (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
1046                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
1047                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
1048                                      PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
1049                 }
1050
1051                 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc) {
1052                         skb->csum = htons(checksum);
1053                         skb->ip_summed = CHECKSUM_COMPLETE;
1054                 }
1055
1056                 if (vlan_stripped)
1057                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1058
1059                 skb_mark_napi_id(skb, &enic->napi[rq->index]);
1060                 if (enic_poll_busy_polling(rq) ||
1061                     !(netdev->features & NETIF_F_GRO))
1062                         netif_receive_skb(skb);
1063                 else
1064                         napi_gro_receive(&enic->napi[q_number], skb);
1065                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1066                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1067                                                   bytes_written);
1068         } else {
1069
1070                 /* Buffer overflow
1071                  */
1072
1073                 dev_kfree_skb_any(skb);
1074         }
1075 }
1076
1077 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1078         u8 type, u16 q_number, u16 completed_index, void *opaque)
1079 {
1080         struct enic *enic = vnic_dev_priv(vdev);
1081
1082         vnic_rq_service(&enic->rq[q_number], cq_desc,
1083                 completed_index, VNIC_RQ_RETURN_DESC,
1084                 enic_rq_indicate_buf, opaque);
1085
1086         return 0;
1087 }
1088
1089 static int enic_poll(struct napi_struct *napi, int budget)
1090 {
1091         struct net_device *netdev = napi->dev;
1092         struct enic *enic = netdev_priv(netdev);
1093         unsigned int cq_rq = enic_cq_rq(enic, 0);
1094         unsigned int cq_wq = enic_cq_wq(enic, 0);
1095         unsigned int intr = enic_legacy_io_intr();
1096         unsigned int rq_work_to_do = budget;
1097         unsigned int wq_work_to_do = -1; /* no limit */
1098         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1099         int err;
1100
1101         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1102                                        enic_wq_service, NULL);
1103
1104         if (!enic_poll_lock_napi(&enic->rq[cq_rq])) {
1105                 if (wq_work_done > 0)
1106                         vnic_intr_return_credits(&enic->intr[intr],
1107                                                  wq_work_done,
1108                                                  0 /* dont unmask intr */,
1109                                                  0 /* dont reset intr timer */);
1110                 return rq_work_done;
1111         }
1112
1113         if (budget > 0)
1114                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1115                         rq_work_to_do, enic_rq_service, NULL);
1116
1117         /* Accumulate intr event credits for this polling
1118          * cycle.  An intr event is the completion of a
1119          * a WQ or RQ packet.
1120          */
1121
1122         work_done = rq_work_done + wq_work_done;
1123
1124         if (work_done > 0)
1125                 vnic_intr_return_credits(&enic->intr[intr],
1126                         work_done,
1127                         0 /* don't unmask intr */,
1128                         0 /* don't reset intr timer */);
1129
1130         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1131
1132         /* Buffer allocation failed. Stay in polling
1133          * mode so we can try to fill the ring again.
1134          */
1135
1136         if (err)
1137                 rq_work_done = rq_work_to_do;
1138
1139         if (rq_work_done < rq_work_to_do) {
1140
1141                 /* Some work done, but not enough to stay in polling,
1142                  * exit polling
1143                  */
1144
1145                 napi_complete(napi);
1146                 vnic_intr_unmask(&enic->intr[intr]);
1147         }
1148         enic_poll_unlock_napi(&enic->rq[cq_rq]);
1149
1150         return rq_work_done;
1151 }
1152
1153 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1154 {
1155         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1156         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1157         u32 timer = cq->tobe_rx_coal_timeval;
1158
1159         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1160                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1161                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1162         }
1163 }
1164
1165 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1166 {
1167         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1168         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1169         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1170         int index;
1171         u32 timer;
1172         u32 range_start;
1173         u32 traffic;
1174         u64 delta;
1175         ktime_t now = ktime_get();
1176
1177         delta = ktime_us_delta(now, cq->prev_ts);
1178         if (delta < ENIC_AIC_TS_BREAK)
1179                 return;
1180         cq->prev_ts = now;
1181
1182         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1183                   pkt_size_counter->small_pkt_bytes_cnt;
1184         /* The table takes Mbps
1185          * traffic *= 8    => bits
1186          * traffic *= (10^6 / delta)    => bps
1187          * traffic /= 10^6     => Mbps
1188          *
1189          * Combining, traffic *= (8 / delta)
1190          */
1191
1192         traffic <<= 3;
1193         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1194
1195         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1196                 if (traffic < mod_table[index].rx_rate)
1197                         break;
1198         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1199                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1200                       rx_coal->small_pkt_range_start :
1201                       rx_coal->large_pkt_range_start;
1202         timer = range_start + ((rx_coal->range_end - range_start) *
1203                                mod_table[index].range_percent / 100);
1204         /* Damping */
1205         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1206
1207         pkt_size_counter->large_pkt_bytes_cnt = 0;
1208         pkt_size_counter->small_pkt_bytes_cnt = 0;
1209 }
1210
1211 #ifdef CONFIG_RFS_ACCEL
1212 static void enic_free_rx_cpu_rmap(struct enic *enic)
1213 {
1214         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1215         enic->netdev->rx_cpu_rmap = NULL;
1216 }
1217
1218 static void enic_set_rx_cpu_rmap(struct enic *enic)
1219 {
1220         int i, res;
1221
1222         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1223                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1224                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1225                         return;
1226                 for (i = 0; i < enic->rq_count; i++) {
1227                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1228                                                enic->msix_entry[i].vector);
1229                         if (unlikely(res)) {
1230                                 enic_free_rx_cpu_rmap(enic);
1231                                 return;
1232                         }
1233                 }
1234         }
1235 }
1236
1237 #else
1238
1239 static void enic_free_rx_cpu_rmap(struct enic *enic)
1240 {
1241 }
1242
1243 static void enic_set_rx_cpu_rmap(struct enic *enic)
1244 {
1245 }
1246
1247 #endif /* CONFIG_RFS_ACCEL */
1248
1249 #ifdef CONFIG_NET_RX_BUSY_POLL
1250 int enic_busy_poll(struct napi_struct *napi)
1251 {
1252         struct net_device *netdev = napi->dev;
1253         struct enic *enic = netdev_priv(netdev);
1254         unsigned int rq = (napi - &enic->napi[0]);
1255         unsigned int cq = enic_cq_rq(enic, rq);
1256         unsigned int intr = enic_msix_rq_intr(enic, rq);
1257         unsigned int work_to_do = -1; /* clean all pkts possible */
1258         unsigned int work_done;
1259
1260         if (!enic_poll_lock_poll(&enic->rq[rq]))
1261                 return LL_FLUSH_BUSY;
1262         work_done = vnic_cq_service(&enic->cq[cq], work_to_do,
1263                                     enic_rq_service, NULL);
1264
1265         if (work_done > 0)
1266                 vnic_intr_return_credits(&enic->intr[intr],
1267                                          work_done, 0, 0);
1268         vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1269         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1270                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1271         enic_poll_unlock_poll(&enic->rq[rq]);
1272
1273         return work_done;
1274 }
1275 #endif /* CONFIG_NET_RX_BUSY_POLL */
1276
1277 static int enic_poll_msix(struct napi_struct *napi, int budget)
1278 {
1279         struct net_device *netdev = napi->dev;
1280         struct enic *enic = netdev_priv(netdev);
1281         unsigned int rq = (napi - &enic->napi[0]);
1282         unsigned int cq = enic_cq_rq(enic, rq);
1283         unsigned int intr = enic_msix_rq_intr(enic, rq);
1284         unsigned int work_to_do = budget;
1285         unsigned int work_done = 0;
1286         int err;
1287
1288         if (!enic_poll_lock_napi(&enic->rq[rq]))
1289                 return work_done;
1290         /* Service RQ
1291          */
1292
1293         if (budget > 0)
1294                 work_done = vnic_cq_service(&enic->cq[cq],
1295                         work_to_do, enic_rq_service, NULL);
1296
1297         /* Return intr event credits for this polling
1298          * cycle.  An intr event is the completion of a
1299          * RQ packet.
1300          */
1301
1302         if (work_done > 0)
1303                 vnic_intr_return_credits(&enic->intr[intr],
1304                         work_done,
1305                         0 /* don't unmask intr */,
1306                         0 /* don't reset intr timer */);
1307
1308         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1309
1310         /* Buffer allocation failed. Stay in polling mode
1311          * so we can try to fill the ring again.
1312          */
1313
1314         if (err)
1315                 work_done = work_to_do;
1316         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1317                 /* Call the function which refreshes
1318                  * the intr coalescing timer value based on
1319                  * the traffic.  This is supported only in
1320                  * the case of MSI-x mode
1321                  */
1322                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1323
1324         if (work_done < work_to_do) {
1325
1326                 /* Some work done, but not enough to stay in polling,
1327                  * exit polling
1328                  */
1329
1330                 napi_complete(napi);
1331                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1332                         enic_set_int_moderation(enic, &enic->rq[rq]);
1333                 vnic_intr_unmask(&enic->intr[intr]);
1334         }
1335         enic_poll_unlock_napi(&enic->rq[rq]);
1336
1337         return work_done;
1338 }
1339
1340 static void enic_notify_timer(unsigned long data)
1341 {
1342         struct enic *enic = (struct enic *)data;
1343
1344         enic_notify_check(enic);
1345
1346         mod_timer(&enic->notify_timer,
1347                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1348 }
1349
1350 static void enic_free_intr(struct enic *enic)
1351 {
1352         struct net_device *netdev = enic->netdev;
1353         unsigned int i;
1354
1355         enic_free_rx_cpu_rmap(enic);
1356         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1357         case VNIC_DEV_INTR_MODE_INTX:
1358                 free_irq(enic->pdev->irq, netdev);
1359                 break;
1360         case VNIC_DEV_INTR_MODE_MSI:
1361                 free_irq(enic->pdev->irq, enic);
1362                 break;
1363         case VNIC_DEV_INTR_MODE_MSIX:
1364                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1365                         if (enic->msix[i].requested)
1366                                 free_irq(enic->msix_entry[i].vector,
1367                                         enic->msix[i].devid);
1368                 break;
1369         default:
1370                 break;
1371         }
1372 }
1373
1374 static int enic_request_intr(struct enic *enic)
1375 {
1376         struct net_device *netdev = enic->netdev;
1377         unsigned int i, intr;
1378         int err = 0;
1379
1380         enic_set_rx_cpu_rmap(enic);
1381         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1382
1383         case VNIC_DEV_INTR_MODE_INTX:
1384
1385                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1386                         IRQF_SHARED, netdev->name, netdev);
1387                 break;
1388
1389         case VNIC_DEV_INTR_MODE_MSI:
1390
1391                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1392                         0, netdev->name, enic);
1393                 break;
1394
1395         case VNIC_DEV_INTR_MODE_MSIX:
1396
1397                 for (i = 0; i < enic->rq_count; i++) {
1398                         intr = enic_msix_rq_intr(enic, i);
1399                         snprintf(enic->msix[intr].devname,
1400                                 sizeof(enic->msix[intr].devname),
1401                                 "%.11s-rx-%d", netdev->name, i);
1402                         enic->msix[intr].isr = enic_isr_msix_rq;
1403                         enic->msix[intr].devid = &enic->napi[i];
1404                 }
1405
1406                 for (i = 0; i < enic->wq_count; i++) {
1407                         intr = enic_msix_wq_intr(enic, i);
1408                         snprintf(enic->msix[intr].devname,
1409                                 sizeof(enic->msix[intr].devname),
1410                                 "%.11s-tx-%d", netdev->name, i);
1411                         enic->msix[intr].isr = enic_isr_msix_wq;
1412                         enic->msix[intr].devid = enic;
1413                 }
1414
1415                 intr = enic_msix_err_intr(enic);
1416                 snprintf(enic->msix[intr].devname,
1417                         sizeof(enic->msix[intr].devname),
1418                         "%.11s-err", netdev->name);
1419                 enic->msix[intr].isr = enic_isr_msix_err;
1420                 enic->msix[intr].devid = enic;
1421
1422                 intr = enic_msix_notify_intr(enic);
1423                 snprintf(enic->msix[intr].devname,
1424                         sizeof(enic->msix[intr].devname),
1425                         "%.11s-notify", netdev->name);
1426                 enic->msix[intr].isr = enic_isr_msix_notify;
1427                 enic->msix[intr].devid = enic;
1428
1429                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1430                         enic->msix[i].requested = 0;
1431
1432                 for (i = 0; i < enic->intr_count; i++) {
1433                         err = request_irq(enic->msix_entry[i].vector,
1434                                 enic->msix[i].isr, 0,
1435                                 enic->msix[i].devname,
1436                                 enic->msix[i].devid);
1437                         if (err) {
1438                                 enic_free_intr(enic);
1439                                 break;
1440                         }
1441                         enic->msix[i].requested = 1;
1442                 }
1443
1444                 break;
1445
1446         default:
1447                 break;
1448         }
1449
1450         return err;
1451 }
1452
1453 static void enic_synchronize_irqs(struct enic *enic)
1454 {
1455         unsigned int i;
1456
1457         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1458         case VNIC_DEV_INTR_MODE_INTX:
1459         case VNIC_DEV_INTR_MODE_MSI:
1460                 synchronize_irq(enic->pdev->irq);
1461                 break;
1462         case VNIC_DEV_INTR_MODE_MSIX:
1463                 for (i = 0; i < enic->intr_count; i++)
1464                         synchronize_irq(enic->msix_entry[i].vector);
1465                 break;
1466         default:
1467                 break;
1468         }
1469 }
1470
1471 static void enic_set_rx_coal_setting(struct enic *enic)
1472 {
1473         unsigned int speed;
1474         int index = -1;
1475         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1476
1477         /* If intr mode is not MSIX, do not do adaptive coalescing */
1478         if (VNIC_DEV_INTR_MODE_MSIX != vnic_dev_get_intr_mode(enic->vdev)) {
1479                 netdev_info(enic->netdev, "INTR mode is not MSIX, Not initializing adaptive coalescing");
1480                 return;
1481         }
1482
1483         /* 1. Read the link speed from fw
1484          * 2. Pick the default range for the speed
1485          * 3. Update it in enic->rx_coalesce_setting
1486          */
1487         speed = vnic_dev_port_speed(enic->vdev);
1488         if (ENIC_LINK_SPEED_10G < speed)
1489                 index = ENIC_LINK_40G_INDEX;
1490         else if (ENIC_LINK_SPEED_4G < speed)
1491                 index = ENIC_LINK_10G_INDEX;
1492         else
1493                 index = ENIC_LINK_4G_INDEX;
1494
1495         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1496         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1497         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1498
1499         /* Start with the value provided by UCSM */
1500         for (index = 0; index < enic->rq_count; index++)
1501                 enic->cq[index].cur_rx_coal_timeval =
1502                                 enic->config.intr_timer_usec;
1503
1504         rx_coal->use_adaptive_rx_coalesce = 1;
1505 }
1506
1507 static int enic_dev_notify_set(struct enic *enic)
1508 {
1509         int err;
1510
1511         spin_lock_bh(&enic->devcmd_lock);
1512         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1513         case VNIC_DEV_INTR_MODE_INTX:
1514                 err = vnic_dev_notify_set(enic->vdev,
1515                         enic_legacy_notify_intr());
1516                 break;
1517         case VNIC_DEV_INTR_MODE_MSIX:
1518                 err = vnic_dev_notify_set(enic->vdev,
1519                         enic_msix_notify_intr(enic));
1520                 break;
1521         default:
1522                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1523                 break;
1524         }
1525         spin_unlock_bh(&enic->devcmd_lock);
1526
1527         return err;
1528 }
1529
1530 static void enic_notify_timer_start(struct enic *enic)
1531 {
1532         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1533         case VNIC_DEV_INTR_MODE_MSI:
1534                 mod_timer(&enic->notify_timer, jiffies);
1535                 break;
1536         default:
1537                 /* Using intr for notification for INTx/MSI-X */
1538                 break;
1539         }
1540 }
1541
1542 /* rtnl lock is held, process context */
1543 static int enic_open(struct net_device *netdev)
1544 {
1545         struct enic *enic = netdev_priv(netdev);
1546         unsigned int i;
1547         int err;
1548
1549         err = enic_request_intr(enic);
1550         if (err) {
1551                 netdev_err(netdev, "Unable to request irq.\n");
1552                 return err;
1553         }
1554
1555         err = enic_dev_notify_set(enic);
1556         if (err) {
1557                 netdev_err(netdev,
1558                         "Failed to alloc notify buffer, aborting.\n");
1559                 goto err_out_free_intr;
1560         }
1561
1562         for (i = 0; i < enic->rq_count; i++) {
1563                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1564                 /* Need at least one buffer on ring to get going */
1565                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1566                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1567                         err = -ENOMEM;
1568                         goto err_out_notify_unset;
1569                 }
1570         }
1571
1572         for (i = 0; i < enic->wq_count; i++)
1573                 vnic_wq_enable(&enic->wq[i]);
1574         for (i = 0; i < enic->rq_count; i++)
1575                 vnic_rq_enable(&enic->rq[i]);
1576
1577         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1578                 enic_dev_add_station_addr(enic);
1579
1580         enic_set_rx_mode(netdev);
1581
1582         netif_tx_wake_all_queues(netdev);
1583
1584         for (i = 0; i < enic->rq_count; i++) {
1585                 enic_busy_poll_init_lock(&enic->rq[i]);
1586                 napi_enable(&enic->napi[i]);
1587         }
1588
1589         enic_dev_enable(enic);
1590
1591         for (i = 0; i < enic->intr_count; i++)
1592                 vnic_intr_unmask(&enic->intr[i]);
1593
1594         enic_notify_timer_start(enic);
1595         enic_rfs_flw_tbl_init(enic);
1596
1597         return 0;
1598
1599 err_out_notify_unset:
1600         enic_dev_notify_unset(enic);
1601 err_out_free_intr:
1602         enic_free_intr(enic);
1603
1604         return err;
1605 }
1606
1607 /* rtnl lock is held, process context */
1608 static int enic_stop(struct net_device *netdev)
1609 {
1610         struct enic *enic = netdev_priv(netdev);
1611         unsigned int i;
1612         int err;
1613
1614         for (i = 0; i < enic->intr_count; i++) {
1615                 vnic_intr_mask(&enic->intr[i]);
1616                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1617         }
1618
1619         enic_synchronize_irqs(enic);
1620
1621         del_timer_sync(&enic->notify_timer);
1622         enic_rfs_flw_tbl_free(enic);
1623
1624         enic_dev_disable(enic);
1625
1626         local_bh_disable();
1627         for (i = 0; i < enic->rq_count; i++) {
1628                 napi_disable(&enic->napi[i]);
1629                 while (!enic_poll_lock_napi(&enic->rq[i]))
1630                         mdelay(1);
1631         }
1632         local_bh_enable();
1633
1634         netif_carrier_off(netdev);
1635         netif_tx_disable(netdev);
1636
1637         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1638                 enic_dev_del_station_addr(enic);
1639
1640         for (i = 0; i < enic->wq_count; i++) {
1641                 err = vnic_wq_disable(&enic->wq[i]);
1642                 if (err)
1643                         return err;
1644         }
1645         for (i = 0; i < enic->rq_count; i++) {
1646                 err = vnic_rq_disable(&enic->rq[i]);
1647                 if (err)
1648                         return err;
1649         }
1650
1651         enic_dev_notify_unset(enic);
1652         enic_free_intr(enic);
1653
1654         for (i = 0; i < enic->wq_count; i++)
1655                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1656         for (i = 0; i < enic->rq_count; i++)
1657                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1658         for (i = 0; i < enic->cq_count; i++)
1659                 vnic_cq_clean(&enic->cq[i]);
1660         for (i = 0; i < enic->intr_count; i++)
1661                 vnic_intr_clean(&enic->intr[i]);
1662
1663         return 0;
1664 }
1665
1666 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1667 {
1668         struct enic *enic = netdev_priv(netdev);
1669         int running = netif_running(netdev);
1670
1671         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1672                 return -EINVAL;
1673
1674         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1675                 return -EOPNOTSUPP;
1676
1677         if (running)
1678                 enic_stop(netdev);
1679
1680         netdev->mtu = new_mtu;
1681
1682         if (netdev->mtu > enic->port_mtu)
1683                 netdev_warn(netdev,
1684                         "interface MTU (%d) set higher than port MTU (%d)\n",
1685                         netdev->mtu, enic->port_mtu);
1686
1687         if (running)
1688                 enic_open(netdev);
1689
1690         return 0;
1691 }
1692
1693 static void enic_change_mtu_work(struct work_struct *work)
1694 {
1695         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1696         struct net_device *netdev = enic->netdev;
1697         int new_mtu = vnic_dev_mtu(enic->vdev);
1698         int err;
1699         unsigned int i;
1700
1701         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1702
1703         rtnl_lock();
1704
1705         /* Stop RQ */
1706         del_timer_sync(&enic->notify_timer);
1707
1708         for (i = 0; i < enic->rq_count; i++)
1709                 napi_disable(&enic->napi[i]);
1710
1711         vnic_intr_mask(&enic->intr[0]);
1712         enic_synchronize_irqs(enic);
1713         err = vnic_rq_disable(&enic->rq[0]);
1714         if (err) {
1715                 rtnl_unlock();
1716                 netdev_err(netdev, "Unable to disable RQ.\n");
1717                 return;
1718         }
1719         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1720         vnic_cq_clean(&enic->cq[0]);
1721         vnic_intr_clean(&enic->intr[0]);
1722
1723         /* Fill RQ with new_mtu-sized buffers */
1724         netdev->mtu = new_mtu;
1725         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1726         /* Need at least one buffer on ring to get going */
1727         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1728                 rtnl_unlock();
1729                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1730                 return;
1731         }
1732
1733         /* Start RQ */
1734         vnic_rq_enable(&enic->rq[0]);
1735         napi_enable(&enic->napi[0]);
1736         vnic_intr_unmask(&enic->intr[0]);
1737         enic_notify_timer_start(enic);
1738
1739         rtnl_unlock();
1740
1741         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1742 }
1743
1744 #ifdef CONFIG_NET_POLL_CONTROLLER
1745 static void enic_poll_controller(struct net_device *netdev)
1746 {
1747         struct enic *enic = netdev_priv(netdev);
1748         struct vnic_dev *vdev = enic->vdev;
1749         unsigned int i, intr;
1750
1751         switch (vnic_dev_get_intr_mode(vdev)) {
1752         case VNIC_DEV_INTR_MODE_MSIX:
1753                 for (i = 0; i < enic->rq_count; i++) {
1754                         intr = enic_msix_rq_intr(enic, i);
1755                         enic_isr_msix_rq(enic->msix_entry[intr].vector,
1756                                 &enic->napi[i]);
1757                 }
1758
1759                 for (i = 0; i < enic->wq_count; i++) {
1760                         intr = enic_msix_wq_intr(enic, i);
1761                         enic_isr_msix_wq(enic->msix_entry[intr].vector, enic);
1762                 }
1763
1764                 break;
1765         case VNIC_DEV_INTR_MODE_MSI:
1766                 enic_isr_msi(enic->pdev->irq, enic);
1767                 break;
1768         case VNIC_DEV_INTR_MODE_INTX:
1769                 enic_isr_legacy(enic->pdev->irq, netdev);
1770                 break;
1771         default:
1772                 break;
1773         }
1774 }
1775 #endif
1776
1777 static int enic_dev_wait(struct vnic_dev *vdev,
1778         int (*start)(struct vnic_dev *, int),
1779         int (*finished)(struct vnic_dev *, int *),
1780         int arg)
1781 {
1782         unsigned long time;
1783         int done;
1784         int err;
1785
1786         BUG_ON(in_interrupt());
1787
1788         err = start(vdev, arg);
1789         if (err)
1790                 return err;
1791
1792         /* Wait for func to complete...2 seconds max
1793          */
1794
1795         time = jiffies + (HZ * 2);
1796         do {
1797
1798                 err = finished(vdev, &done);
1799                 if (err)
1800                         return err;
1801
1802                 if (done)
1803                         return 0;
1804
1805                 schedule_timeout_uninterruptible(HZ / 10);
1806
1807         } while (time_after(time, jiffies));
1808
1809         return -ETIMEDOUT;
1810 }
1811
1812 static int enic_dev_open(struct enic *enic)
1813 {
1814         int err;
1815
1816         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1817                 vnic_dev_open_done, 0);
1818         if (err)
1819                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1820                         err);
1821
1822         return err;
1823 }
1824
1825 static int enic_dev_hang_reset(struct enic *enic)
1826 {
1827         int err;
1828
1829         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1830                 vnic_dev_hang_reset_done, 0);
1831         if (err)
1832                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1833                         err);
1834
1835         return err;
1836 }
1837
1838 static int enic_set_rsskey(struct enic *enic)
1839 {
1840         dma_addr_t rss_key_buf_pa;
1841         union vnic_rss_key *rss_key_buf_va = NULL;
1842         union vnic_rss_key rss_key = {
1843                 .key[0].b = {85, 67, 83, 97, 119, 101, 115, 111, 109, 101},
1844                 .key[1].b = {80, 65, 76, 79, 117, 110, 105, 113, 117, 101},
1845                 .key[2].b = {76, 73, 78, 85, 88, 114, 111, 99, 107, 115},
1846                 .key[3].b = {69, 78, 73, 67, 105, 115, 99, 111, 111, 108},
1847         };
1848         int err;
1849
1850         rss_key_buf_va = pci_alloc_consistent(enic->pdev,
1851                 sizeof(union vnic_rss_key), &rss_key_buf_pa);
1852         if (!rss_key_buf_va)
1853                 return -ENOMEM;
1854
1855         memcpy(rss_key_buf_va, &rss_key, sizeof(union vnic_rss_key));
1856
1857         spin_lock_bh(&enic->devcmd_lock);
1858         err = enic_set_rss_key(enic,
1859                 rss_key_buf_pa,
1860                 sizeof(union vnic_rss_key));
1861         spin_unlock_bh(&enic->devcmd_lock);
1862
1863         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1864                 rss_key_buf_va, rss_key_buf_pa);
1865
1866         return err;
1867 }
1868
1869 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1870 {
1871         dma_addr_t rss_cpu_buf_pa;
1872         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1873         unsigned int i;
1874         int err;
1875
1876         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1877                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1878         if (!rss_cpu_buf_va)
1879                 return -ENOMEM;
1880
1881         for (i = 0; i < (1 << rss_hash_bits); i++)
1882                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1883
1884         spin_lock_bh(&enic->devcmd_lock);
1885         err = enic_set_rss_cpu(enic,
1886                 rss_cpu_buf_pa,
1887                 sizeof(union vnic_rss_cpu));
1888         spin_unlock_bh(&enic->devcmd_lock);
1889
1890         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1891                 rss_cpu_buf_va, rss_cpu_buf_pa);
1892
1893         return err;
1894 }
1895
1896 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
1897         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
1898 {
1899         const u8 tso_ipid_split_en = 0;
1900         const u8 ig_vlan_strip_en = 1;
1901         int err;
1902
1903         /* Enable VLAN tag stripping.
1904         */
1905
1906         spin_lock_bh(&enic->devcmd_lock);
1907         err = enic_set_nic_cfg(enic,
1908                 rss_default_cpu, rss_hash_type,
1909                 rss_hash_bits, rss_base_cpu,
1910                 rss_enable, tso_ipid_split_en,
1911                 ig_vlan_strip_en);
1912         spin_unlock_bh(&enic->devcmd_lock);
1913
1914         return err;
1915 }
1916
1917 static int enic_set_rss_nic_cfg(struct enic *enic)
1918 {
1919         struct device *dev = enic_get_dev(enic);
1920         const u8 rss_default_cpu = 0;
1921         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
1922                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
1923                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
1924                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
1925         const u8 rss_hash_bits = 7;
1926         const u8 rss_base_cpu = 0;
1927         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
1928
1929         if (rss_enable) {
1930                 if (!enic_set_rsskey(enic)) {
1931                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
1932                                 rss_enable = 0;
1933                                 dev_warn(dev, "RSS disabled, "
1934                                         "Failed to set RSS cpu indirection table.");
1935                         }
1936                 } else {
1937                         rss_enable = 0;
1938                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
1939                 }
1940         }
1941
1942         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
1943                 rss_hash_bits, rss_base_cpu, rss_enable);
1944 }
1945
1946 static void enic_reset(struct work_struct *work)
1947 {
1948         struct enic *enic = container_of(work, struct enic, reset);
1949
1950         if (!netif_running(enic->netdev))
1951                 return;
1952
1953         rtnl_lock();
1954
1955         spin_lock(&enic->enic_api_lock);
1956         enic_dev_hang_notify(enic);
1957         enic_stop(enic->netdev);
1958         enic_dev_hang_reset(enic);
1959         enic_reset_addr_lists(enic);
1960         enic_init_vnic_resources(enic);
1961         enic_set_rss_nic_cfg(enic);
1962         enic_dev_set_ig_vlan_rewrite_mode(enic);
1963         enic_open(enic->netdev);
1964         spin_unlock(&enic->enic_api_lock);
1965         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
1966
1967         rtnl_unlock();
1968 }
1969
1970 static int enic_set_intr_mode(struct enic *enic)
1971 {
1972         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
1973         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
1974         unsigned int i;
1975
1976         /* Set interrupt mode (INTx, MSI, MSI-X) depending
1977          * on system capabilities.
1978          *
1979          * Try MSI-X first
1980          *
1981          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1982          * (the second to last INTR is used for WQ/RQ errors)
1983          * (the last INTR is used for notifications)
1984          */
1985
1986         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1987         for (i = 0; i < n + m + 2; i++)
1988                 enic->msix_entry[i].entry = i;
1989
1990         /* Use multiple RQs if RSS is enabled
1991          */
1992
1993         if (ENIC_SETTING(enic, RSS) &&
1994             enic->config.intr_mode < 1 &&
1995             enic->rq_count >= n &&
1996             enic->wq_count >= m &&
1997             enic->cq_count >= n + m &&
1998             enic->intr_count >= n + m + 2) {
1999
2000                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2001                                           n + m + 2, n + m + 2) > 0) {
2002
2003                         enic->rq_count = n;
2004                         enic->wq_count = m;
2005                         enic->cq_count = n + m;
2006                         enic->intr_count = n + m + 2;
2007
2008                         vnic_dev_set_intr_mode(enic->vdev,
2009                                 VNIC_DEV_INTR_MODE_MSIX);
2010
2011                         return 0;
2012                 }
2013         }
2014
2015         if (enic->config.intr_mode < 1 &&
2016             enic->rq_count >= 1 &&
2017             enic->wq_count >= m &&
2018             enic->cq_count >= 1 + m &&
2019             enic->intr_count >= 1 + m + 2) {
2020                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2021                                           1 + m + 2, 1 + m + 2) > 0) {
2022
2023                         enic->rq_count = 1;
2024                         enic->wq_count = m;
2025                         enic->cq_count = 1 + m;
2026                         enic->intr_count = 1 + m + 2;
2027
2028                         vnic_dev_set_intr_mode(enic->vdev,
2029                                 VNIC_DEV_INTR_MODE_MSIX);
2030
2031                         return 0;
2032                 }
2033         }
2034
2035         /* Next try MSI
2036          *
2037          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2038          */
2039
2040         if (enic->config.intr_mode < 2 &&
2041             enic->rq_count >= 1 &&
2042             enic->wq_count >= 1 &&
2043             enic->cq_count >= 2 &&
2044             enic->intr_count >= 1 &&
2045             !pci_enable_msi(enic->pdev)) {
2046
2047                 enic->rq_count = 1;
2048                 enic->wq_count = 1;
2049                 enic->cq_count = 2;
2050                 enic->intr_count = 1;
2051
2052                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2053
2054                 return 0;
2055         }
2056
2057         /* Next try INTx
2058          *
2059          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2060          * (the first INTR is used for WQ/RQ)
2061          * (the second INTR is used for WQ/RQ errors)
2062          * (the last INTR is used for notifications)
2063          */
2064
2065         if (enic->config.intr_mode < 3 &&
2066             enic->rq_count >= 1 &&
2067             enic->wq_count >= 1 &&
2068             enic->cq_count >= 2 &&
2069             enic->intr_count >= 3) {
2070
2071                 enic->rq_count = 1;
2072                 enic->wq_count = 1;
2073                 enic->cq_count = 2;
2074                 enic->intr_count = 3;
2075
2076                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2077
2078                 return 0;
2079         }
2080
2081         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2082
2083         return -EINVAL;
2084 }
2085
2086 static void enic_clear_intr_mode(struct enic *enic)
2087 {
2088         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2089         case VNIC_DEV_INTR_MODE_MSIX:
2090                 pci_disable_msix(enic->pdev);
2091                 break;
2092         case VNIC_DEV_INTR_MODE_MSI:
2093                 pci_disable_msi(enic->pdev);
2094                 break;
2095         default:
2096                 break;
2097         }
2098
2099         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2100 }
2101
2102 static const struct net_device_ops enic_netdev_dynamic_ops = {
2103         .ndo_open               = enic_open,
2104         .ndo_stop               = enic_stop,
2105         .ndo_start_xmit         = enic_hard_start_xmit,
2106         .ndo_get_stats64        = enic_get_stats,
2107         .ndo_validate_addr      = eth_validate_addr,
2108         .ndo_set_rx_mode        = enic_set_rx_mode,
2109         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2110         .ndo_change_mtu         = enic_change_mtu,
2111         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2112         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2113         .ndo_tx_timeout         = enic_tx_timeout,
2114         .ndo_set_vf_port        = enic_set_vf_port,
2115         .ndo_get_vf_port        = enic_get_vf_port,
2116         .ndo_set_vf_mac         = enic_set_vf_mac,
2117 #ifdef CONFIG_NET_POLL_CONTROLLER
2118         .ndo_poll_controller    = enic_poll_controller,
2119 #endif
2120 #ifdef CONFIG_RFS_ACCEL
2121         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2122 #endif
2123 #ifdef CONFIG_NET_RX_BUSY_POLL
2124         .ndo_busy_poll          = enic_busy_poll,
2125 #endif
2126 };
2127
2128 static const struct net_device_ops enic_netdev_ops = {
2129         .ndo_open               = enic_open,
2130         .ndo_stop               = enic_stop,
2131         .ndo_start_xmit         = enic_hard_start_xmit,
2132         .ndo_get_stats64        = enic_get_stats,
2133         .ndo_validate_addr      = eth_validate_addr,
2134         .ndo_set_mac_address    = enic_set_mac_address,
2135         .ndo_set_rx_mode        = enic_set_rx_mode,
2136         .ndo_change_mtu         = enic_change_mtu,
2137         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2138         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2139         .ndo_tx_timeout         = enic_tx_timeout,
2140         .ndo_set_vf_port        = enic_set_vf_port,
2141         .ndo_get_vf_port        = enic_get_vf_port,
2142         .ndo_set_vf_mac         = enic_set_vf_mac,
2143 #ifdef CONFIG_NET_POLL_CONTROLLER
2144         .ndo_poll_controller    = enic_poll_controller,
2145 #endif
2146 #ifdef CONFIG_RFS_ACCEL
2147         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2148 #endif
2149 #ifdef CONFIG_NET_RX_BUSY_POLL
2150         .ndo_busy_poll          = enic_busy_poll,
2151 #endif
2152 };
2153
2154 static void enic_dev_deinit(struct enic *enic)
2155 {
2156         unsigned int i;
2157
2158         for (i = 0; i < enic->rq_count; i++) {
2159                 napi_hash_del(&enic->napi[i]);
2160                 netif_napi_del(&enic->napi[i]);
2161         }
2162
2163         enic_free_vnic_resources(enic);
2164         enic_clear_intr_mode(enic);
2165 }
2166
2167 static int enic_dev_init(struct enic *enic)
2168 {
2169         struct device *dev = enic_get_dev(enic);
2170         struct net_device *netdev = enic->netdev;
2171         unsigned int i;
2172         int err;
2173
2174         /* Get interrupt coalesce timer info */
2175         err = enic_dev_intr_coal_timer_info(enic);
2176         if (err) {
2177                 dev_warn(dev, "Using default conversion factor for "
2178                         "interrupt coalesce timer\n");
2179                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2180         }
2181
2182         /* Get vNIC configuration
2183          */
2184
2185         err = enic_get_vnic_config(enic);
2186         if (err) {
2187                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2188                 return err;
2189         }
2190
2191         /* Get available resource counts
2192          */
2193
2194         enic_get_res_counts(enic);
2195
2196         /* Set interrupt mode based on resource counts and system
2197          * capabilities
2198          */
2199
2200         err = enic_set_intr_mode(enic);
2201         if (err) {
2202                 dev_err(dev, "Failed to set intr mode based on resource "
2203                         "counts and system capabilities, aborting\n");
2204                 return err;
2205         }
2206
2207         /* Allocate and configure vNIC resources
2208          */
2209
2210         err = enic_alloc_vnic_resources(enic);
2211         if (err) {
2212                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2213                 goto err_out_free_vnic_resources;
2214         }
2215
2216         enic_init_vnic_resources(enic);
2217
2218         err = enic_set_rss_nic_cfg(enic);
2219         if (err) {
2220                 dev_err(dev, "Failed to config nic, aborting\n");
2221                 goto err_out_free_vnic_resources;
2222         }
2223
2224         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2225         default:
2226                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2227                 napi_hash_add(&enic->napi[0]);
2228                 break;
2229         case VNIC_DEV_INTR_MODE_MSIX:
2230                 for (i = 0; i < enic->rq_count; i++) {
2231                         netif_napi_add(netdev, &enic->napi[i],
2232                                 enic_poll_msix, 64);
2233                         napi_hash_add(&enic->napi[i]);
2234                 }
2235                 break;
2236         }
2237
2238         return 0;
2239
2240 err_out_free_vnic_resources:
2241         enic_clear_intr_mode(enic);
2242         enic_free_vnic_resources(enic);
2243
2244         return err;
2245 }
2246
2247 static void enic_iounmap(struct enic *enic)
2248 {
2249         unsigned int i;
2250
2251         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2252                 if (enic->bar[i].vaddr)
2253                         iounmap(enic->bar[i].vaddr);
2254 }
2255
2256 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2257 {
2258         struct device *dev = &pdev->dev;
2259         struct net_device *netdev;
2260         struct enic *enic;
2261         int using_dac = 0;
2262         unsigned int i;
2263         int err;
2264 #ifdef CONFIG_PCI_IOV
2265         int pos = 0;
2266 #endif
2267         int num_pps = 1;
2268
2269         /* Allocate net device structure and initialize.  Private
2270          * instance data is initialized to zero.
2271          */
2272
2273         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2274                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2275         if (!netdev)
2276                 return -ENOMEM;
2277
2278         pci_set_drvdata(pdev, netdev);
2279
2280         SET_NETDEV_DEV(netdev, &pdev->dev);
2281
2282         enic = netdev_priv(netdev);
2283         enic->netdev = netdev;
2284         enic->pdev = pdev;
2285
2286         /* Setup PCI resources
2287          */
2288
2289         err = pci_enable_device_mem(pdev);
2290         if (err) {
2291                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2292                 goto err_out_free_netdev;
2293         }
2294
2295         err = pci_request_regions(pdev, DRV_NAME);
2296         if (err) {
2297                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2298                 goto err_out_disable_device;
2299         }
2300
2301         pci_set_master(pdev);
2302
2303         /* Query PCI controller on system for DMA addressing
2304          * limitation for the device.  Try 64-bit first, and
2305          * fail to 32-bit.
2306          */
2307
2308         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2309         if (err) {
2310                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2311                 if (err) {
2312                         dev_err(dev, "No usable DMA configuration, aborting\n");
2313                         goto err_out_release_regions;
2314                 }
2315                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2316                 if (err) {
2317                         dev_err(dev, "Unable to obtain %u-bit DMA "
2318                                 "for consistent allocations, aborting\n", 32);
2319                         goto err_out_release_regions;
2320                 }
2321         } else {
2322                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2323                 if (err) {
2324                         dev_err(dev, "Unable to obtain %u-bit DMA "
2325                                 "for consistent allocations, aborting\n", 64);
2326                         goto err_out_release_regions;
2327                 }
2328                 using_dac = 1;
2329         }
2330
2331         /* Map vNIC resources from BAR0-5
2332          */
2333
2334         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2335                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2336                         continue;
2337                 enic->bar[i].len = pci_resource_len(pdev, i);
2338                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2339                 if (!enic->bar[i].vaddr) {
2340                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2341                         err = -ENODEV;
2342                         goto err_out_iounmap;
2343                 }
2344                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2345         }
2346
2347         /* Register vNIC device
2348          */
2349
2350         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2351                 ARRAY_SIZE(enic->bar));
2352         if (!enic->vdev) {
2353                 dev_err(dev, "vNIC registration failed, aborting\n");
2354                 err = -ENODEV;
2355                 goto err_out_iounmap;
2356         }
2357
2358 #ifdef CONFIG_PCI_IOV
2359         /* Get number of subvnics */
2360         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2361         if (pos) {
2362                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2363                         &enic->num_vfs);
2364                 if (enic->num_vfs) {
2365                         err = pci_enable_sriov(pdev, enic->num_vfs);
2366                         if (err) {
2367                                 dev_err(dev, "SRIOV enable failed, aborting."
2368                                         " pci_enable_sriov() returned %d\n",
2369                                         err);
2370                                 goto err_out_vnic_unregister;
2371                         }
2372                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2373                         num_pps = enic->num_vfs;
2374                 }
2375         }
2376 #endif
2377
2378         /* Allocate structure for port profiles */
2379         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2380         if (!enic->pp) {
2381                 err = -ENOMEM;
2382                 goto err_out_disable_sriov_pp;
2383         }
2384
2385         /* Issue device open to get device in known state
2386          */
2387
2388         err = enic_dev_open(enic);
2389         if (err) {
2390                 dev_err(dev, "vNIC dev open failed, aborting\n");
2391                 goto err_out_disable_sriov;
2392         }
2393
2394         /* Setup devcmd lock
2395          */
2396
2397         spin_lock_init(&enic->devcmd_lock);
2398         spin_lock_init(&enic->enic_api_lock);
2399
2400         /*
2401          * Set ingress vlan rewrite mode before vnic initialization
2402          */
2403
2404         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2405         if (err) {
2406                 dev_err(dev,
2407                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2408                 goto err_out_dev_close;
2409         }
2410
2411         /* Issue device init to initialize the vnic-to-switch link.
2412          * We'll start with carrier off and wait for link UP
2413          * notification later to turn on carrier.  We don't need
2414          * to wait here for the vnic-to-switch link initialization
2415          * to complete; link UP notification is the indication that
2416          * the process is complete.
2417          */
2418
2419         netif_carrier_off(netdev);
2420
2421         /* Do not call dev_init for a dynamic vnic.
2422          * For a dynamic vnic, init_prov_info will be
2423          * called later by an upper layer.
2424          */
2425
2426         if (!enic_is_dynamic(enic)) {
2427                 err = vnic_dev_init(enic->vdev, 0);
2428                 if (err) {
2429                         dev_err(dev, "vNIC dev init failed, aborting\n");
2430                         goto err_out_dev_close;
2431                 }
2432         }
2433
2434         err = enic_dev_init(enic);
2435         if (err) {
2436                 dev_err(dev, "Device initialization failed, aborting\n");
2437                 goto err_out_dev_close;
2438         }
2439
2440         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2441         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2442
2443         /* Setup notification timer, HW reset task, and wq locks
2444          */
2445
2446         init_timer(&enic->notify_timer);
2447         enic->notify_timer.function = enic_notify_timer;
2448         enic->notify_timer.data = (unsigned long)enic;
2449
2450         enic_set_rx_coal_setting(enic);
2451         INIT_WORK(&enic->reset, enic_reset);
2452         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2453
2454         for (i = 0; i < enic->wq_count; i++)
2455                 spin_lock_init(&enic->wq_lock[i]);
2456
2457         /* Register net device
2458          */
2459
2460         enic->port_mtu = enic->config.mtu;
2461         (void)enic_change_mtu(netdev, enic->port_mtu);
2462
2463         err = enic_set_mac_addr(netdev, enic->mac_addr);
2464         if (err) {
2465                 dev_err(dev, "Invalid MAC address, aborting\n");
2466                 goto err_out_dev_deinit;
2467         }
2468
2469         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2470         /* rx coalesce time already got initialized. This gets used
2471          * if adaptive coal is turned off
2472          */
2473         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2474
2475         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2476                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2477         else
2478                 netdev->netdev_ops = &enic_netdev_ops;
2479
2480         netdev->watchdog_timeo = 2 * HZ;
2481         enic_set_ethtool_ops(netdev);
2482
2483         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2484         if (ENIC_SETTING(enic, LOOP)) {
2485                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2486                 enic->loop_enable = 1;
2487                 enic->loop_tag = enic->config.loop_tag;
2488                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2489         }
2490         if (ENIC_SETTING(enic, TXCSUM))
2491                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2492         if (ENIC_SETTING(enic, TSO))
2493                 netdev->hw_features |= NETIF_F_TSO |
2494                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2495         if (ENIC_SETTING(enic, RSS))
2496                 netdev->hw_features |= NETIF_F_RXHASH;
2497         if (ENIC_SETTING(enic, RXCSUM))
2498                 netdev->hw_features |= NETIF_F_RXCSUM;
2499
2500         netdev->features |= netdev->hw_features;
2501
2502 #ifdef CONFIG_RFS_ACCEL
2503         netdev->hw_features |= NETIF_F_NTUPLE;
2504 #endif
2505
2506         if (using_dac)
2507                 netdev->features |= NETIF_F_HIGHDMA;
2508
2509         netdev->priv_flags |= IFF_UNICAST_FLT;
2510
2511         err = register_netdev(netdev);
2512         if (err) {
2513                 dev_err(dev, "Cannot register net device, aborting\n");
2514                 goto err_out_dev_deinit;
2515         }
2516
2517         return 0;
2518
2519 err_out_dev_deinit:
2520         enic_dev_deinit(enic);
2521 err_out_dev_close:
2522         vnic_dev_close(enic->vdev);
2523 err_out_disable_sriov:
2524         kfree(enic->pp);
2525 err_out_disable_sriov_pp:
2526 #ifdef CONFIG_PCI_IOV
2527         if (enic_sriov_enabled(enic)) {
2528                 pci_disable_sriov(pdev);
2529                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2530         }
2531 err_out_vnic_unregister:
2532 #endif
2533         vnic_dev_unregister(enic->vdev);
2534 err_out_iounmap:
2535         enic_iounmap(enic);
2536 err_out_release_regions:
2537         pci_release_regions(pdev);
2538 err_out_disable_device:
2539         pci_disable_device(pdev);
2540 err_out_free_netdev:
2541         free_netdev(netdev);
2542
2543         return err;
2544 }
2545
2546 static void enic_remove(struct pci_dev *pdev)
2547 {
2548         struct net_device *netdev = pci_get_drvdata(pdev);
2549
2550         if (netdev) {
2551                 struct enic *enic = netdev_priv(netdev);
2552
2553                 cancel_work_sync(&enic->reset);
2554                 cancel_work_sync(&enic->change_mtu_work);
2555                 unregister_netdev(netdev);
2556                 enic_dev_deinit(enic);
2557                 vnic_dev_close(enic->vdev);
2558 #ifdef CONFIG_PCI_IOV
2559                 if (enic_sriov_enabled(enic)) {
2560                         pci_disable_sriov(pdev);
2561                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2562                 }
2563 #endif
2564                 kfree(enic->pp);
2565                 vnic_dev_unregister(enic->vdev);
2566                 enic_iounmap(enic);
2567                 pci_release_regions(pdev);
2568                 pci_disable_device(pdev);
2569                 free_netdev(netdev);
2570         }
2571 }
2572
2573 static struct pci_driver enic_driver = {
2574         .name = DRV_NAME,
2575         .id_table = enic_id_table,
2576         .probe = enic_probe,
2577         .remove = enic_remove,
2578 };
2579
2580 static int __init enic_init_module(void)
2581 {
2582         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2583
2584         return pci_register_driver(&enic_driver);
2585 }
2586
2587 static void __exit enic_cleanup_module(void)
2588 {
2589         pci_unregister_driver(&enic_driver);
2590 }
2591
2592 module_init(enic_init_module);
2593 module_exit(enic_cleanup_module);