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 #include <linux/numa.h>
  43 #ifdef CONFIG_RFS_ACCEL
  44 #include <linux/cpu_rmap.h>
  45 #endif
  46 #include <linux/crash_dump.h>
  47 #include <net/busy_poll.h>
  48 #include <net/vxlan.h>
  49
  50 #include "cq_enet_desc.h"
  51 #include "vnic_dev.h"
  52 #include "vnic_intr.h"
  53 #include "vnic_stats.h"
  54 #include "vnic_vic.h"
  55 #include "enic_res.h"
  56 #include "enic.h"
  57 #include "enic_dev.h"
  58 #include "enic_pp.h"
  59 #include "enic_clsf.h"
  60
  61 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  62 #define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  63 #define MAX_TSO                         (1 << 16)
  64 #define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  65
  66 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  67 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
  68 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
  69
  70 #define RX_COPYBREAK_DEFAULT            256
  71
  72 /* Supported devices */
  73 static const struct pci_device_id enic_id_table[] = {
  74         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  75         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
  76         { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
  77         { 0, }  /* end of table */
  78 };
  79
  80 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  81 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  82 MODULE_LICENSE("GPL");
  83 MODULE_VERSION(DRV_VERSION);
  84 MODULE_DEVICE_TABLE(pci, enic_id_table);
  85
  86 #define ENIC_LARGE_PKT_THRESHOLD                1000
  87 #define ENIC_MAX_COALESCE_TIMERS                10
  88 /*  Interrupt moderation table, which will be used to decide the
  89  *  coalescing timer values
  90  *  {rx_rate in Mbps, mapping percentage of the range}
  91  */
  92 static struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
  93         {4000,  0},
  94         {4400, 10},
  95         {5060, 20},
  96         {5230, 30},
  97         {5540, 40},
  98         {5820, 50},
  99         {6120, 60},
 100         {6435, 70},
 101         {6745, 80},
 102         {7000, 90},
 103         {0xFFFFFFFF, 100}
 104 };
 105
 106 /* This table helps the driver to pick different ranges for rx coalescing
 107  * timer depending on the link speed.
 108  */
 109 static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
 110         {0,  0}, /* 0  - 4  Gbps */
 111         {0,  3}, /* 4  - 10 Gbps */
 112         {3,  6}, /* 10 - 40 Gbps */
 113 };
 114
 115 static void enic_init_affinity_hint(struct enic *enic)
 116 {
 117         int numa_node = dev_to_node(&enic->pdev->dev);
 118         int i;
 119
 120         for (i = 0; i < enic->intr_count; i++) {
 121                 if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) ||
 122                     (cpumask_available(enic->msix[i].affinity_mask) &&
 123                      !cpumask_empty(enic->msix[i].affinity_mask)))
 124                         continue;
 125                 if (zalloc_cpumask_var(&enic->msix[i].affinity_mask,
 126                                        GFP_KERNEL))
 127                         cpumask_set_cpu(cpumask_local_spread(i, numa_node),
 128                                         enic->msix[i].affinity_mask);
 129         }
 130 }
 131
 132 static void enic_free_affinity_hint(struct enic *enic)
 133 {
 134         int i;
 135
 136         for (i = 0; i < enic->intr_count; i++) {
 137                 if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i))
 138                         continue;
 139                 free_cpumask_var(enic->msix[i].affinity_mask);
 140         }
 141 }
 142
 143 static void enic_set_affinity_hint(struct enic *enic)
 144 {
 145         int i;
 146         int err;
 147
 148         for (i = 0; i < enic->intr_count; i++) {
 149                 if (enic_is_err_intr(enic, i)           ||
 150                     enic_is_notify_intr(enic, i)        ||
 151                     !cpumask_available(enic->msix[i].affinity_mask) ||
 152                     cpumask_empty(enic->msix[i].affinity_mask))
 153                         continue;
 154                 err = irq_set_affinity_hint(enic->msix_entry[i].vector,
 155                                             enic->msix[i].affinity_mask);
 156                 if (err)
 157                         netdev_warn(enic->netdev, "irq_set_affinity_hint failed, err %d\n",
 158                                     err);
 159         }
 160
 161         for (i = 0; i < enic->wq_count; i++) {
 162                 int wq_intr = enic_msix_wq_intr(enic, i);
 163
 164                 if (cpumask_available(enic->msix[wq_intr].affinity_mask) &&
 165                     !cpumask_empty(enic->msix[wq_intr].affinity_mask))
 166                         netif_set_xps_queue(enic->netdev,
 167                                             enic->msix[wq_intr].affinity_mask,
 168                                             i);
 169         }
 170 }
 171
 172 static void enic_unset_affinity_hint(struct enic *enic)
 173 {
 174         int i;
 175
 176         for (i = 0; i < enic->intr_count; i++)
 177                 irq_set_affinity_hint(enic->msix_entry[i].vector, NULL);
 178 }
 179
 180 static void enic_udp_tunnel_add(struct net_device *netdev,
 181                                 struct udp_tunnel_info *ti)
 182 {
 183         struct enic *enic = netdev_priv(netdev);
 184         __be16 port = ti->port;
 185         int err;
 186
 187         spin_lock_bh(&enic->devcmd_lock);
 188
 189         if (ti->type != UDP_TUNNEL_TYPE_VXLAN) {
 190                 netdev_info(netdev, "udp_tnl: only vxlan tunnel offload supported");
 191                 goto error;
 192         }
 193
 194         if (ti->sa_family != AF_INET) {
 195                 netdev_info(netdev, "vxlan: only IPv4 offload supported");
 196                 goto error;
 197         }
 198
 199         if (enic->vxlan.vxlan_udp_port_number) {
 200                 if (ntohs(port) == enic->vxlan.vxlan_udp_port_number)
 201                         netdev_warn(netdev, "vxlan: udp port already offloaded");
 202                 else
 203                         netdev_info(netdev, "vxlan: offload supported for only one UDP port");
 204
 205                 goto error;
 206         }
 207
 208         err = vnic_dev_overlay_offload_cfg(enic->vdev,
 209                                            OVERLAY_CFG_VXLAN_PORT_UPDATE,
 210                                            ntohs(port));
 211         if (err)
 212                 goto error;
 213
 214         err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
 215                                             enic->vxlan.patch_level);
 216         if (err)
 217                 goto error;
 218
 219         enic->vxlan.vxlan_udp_port_number = ntohs(port);
 220
 221         netdev_info(netdev, "vxlan fw-vers-%d: offload enabled for udp port: %d, sa_family: %d ",
 222                     (int)enic->vxlan.patch_level, ntohs(port), ti->sa_family);
 223
 224         goto unlock;
 225
 226 error:
 227         netdev_info(netdev, "failed to offload udp port: %d, sa_family: %d, type: %d",
 228                     ntohs(port), ti->sa_family, ti->type);
 229 unlock:
 230         spin_unlock_bh(&enic->devcmd_lock);
 231 }
 232
 233 static void enic_udp_tunnel_del(struct net_device *netdev,
 234                                 struct udp_tunnel_info *ti)
 235 {
 236         struct enic *enic = netdev_priv(netdev);
 237         int err;
 238
 239         spin_lock_bh(&enic->devcmd_lock);
 240
 241         if ((ti->sa_family != AF_INET) ||
 242             ((ntohs(ti->port) != enic->vxlan.vxlan_udp_port_number)) ||
 243             (ti->type != UDP_TUNNEL_TYPE_VXLAN)) {
 244                 netdev_info(netdev, "udp_tnl: port:%d, sa_family: %d, type: %d not offloaded",
 245                             ntohs(ti->port), ti->sa_family, ti->type);
 246                 goto unlock;
 247         }
 248
 249         err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
 250                                             OVERLAY_OFFLOAD_DISABLE);
 251         if (err) {
 252                 netdev_err(netdev, "vxlan: del offload udp port: %d failed",
 253                            ntohs(ti->port));
 254                 goto unlock;
 255         }
 256
 257         enic->vxlan.vxlan_udp_port_number = 0;
 258
 259         netdev_info(netdev, "vxlan: del offload udp port %d, family %d\n",
 260                     ntohs(ti->port), ti->sa_family);
 261
 262 unlock:
 263         spin_unlock_bh(&enic->devcmd_lock);
 264 }
 265
 266 static netdev_features_t enic_features_check(struct sk_buff *skb,
 267                                              struct net_device *dev,
 268                                              netdev_features_t features)
 269 {
 270         const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
 271         struct enic *enic = netdev_priv(dev);
 272         struct udphdr *udph;
 273         u16 port = 0;
 274         u16 proto;
 275
 276         if (!skb->encapsulation)
 277                 return features;
 278
 279         features = vxlan_features_check(skb, features);
 280
 281         /* hardware only supports IPv4 vxlan tunnel */
 282         if (vlan_get_protocol(skb) != htons(ETH_P_IP))
 283                 goto out;
 284
 285         /* hardware does not support offload of ipv6 inner pkt */
 286         if (eth->h_proto != ntohs(ETH_P_IP))
 287                 goto out;
 288
 289         proto = ip_hdr(skb)->protocol;
 290
 291         if (proto == IPPROTO_UDP) {
 292                 udph = udp_hdr(skb);
 293                 port = be16_to_cpu(udph->dest);
 294         }
 295
 296         /* HW supports offload of only one UDP port. Remove CSUM and GSO MASK
 297          * for other UDP port tunnels
 298          */
 299         if (port  != enic->vxlan.vxlan_udp_port_number)
 300                 goto out;
 301
 302         return features;
 303
 304 out:
 305         return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 306 }
 307
 308 int enic_is_dynamic(struct enic *enic)
 309 {
 310         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 311 }
 312
 313 int enic_sriov_enabled(struct enic *enic)
 314 {
 315         return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 316 }
 317
 318 static int enic_is_sriov_vf(struct enic *enic)
 319 {
 320         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 321 }
 322
 323 int enic_is_valid_vf(struct enic *enic, int vf)
 324 {
 325 #ifdef CONFIG_PCI_IOV
 326         return vf >= 0 && vf < enic->num_vfs;
 327 #else
 328         return 0;
 329 #endif
 330 }
 331
 332 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 333 {
 334         struct enic *enic = vnic_dev_priv(wq->vdev);
 335
 336         if (buf->sop)
 337                 pci_unmap_single(enic->pdev, buf->dma_addr,
 338                         buf->len, PCI_DMA_TODEVICE);
 339         else
 340                 pci_unmap_page(enic->pdev, buf->dma_addr,
 341                         buf->len, PCI_DMA_TODEVICE);
 342
 343         if (buf->os_buf)
 344                 dev_kfree_skb_any(buf->os_buf);
 345 }
 346
 347 static void enic_wq_free_buf(struct vnic_wq *wq,
 348         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 349 {
 350         enic_free_wq_buf(wq, buf);
 351 }
 352
 353 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 354         u8 type, u16 q_number, u16 completed_index, void *opaque)
 355 {
 356         struct enic *enic = vnic_dev_priv(vdev);
 357
 358         spin_lock(&enic->wq_lock[q_number]);
 359
 360         vnic_wq_service(&enic->wq[q_number], cq_desc,
 361                 completed_index, enic_wq_free_buf,
 362                 opaque);
 363
 364         if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 365             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 366             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 367                 netif_wake_subqueue(enic->netdev, q_number);
 368
 369         spin_unlock(&enic->wq_lock[q_number]);
 370
 371         return 0;
 372 }
 373
 374 static bool enic_log_q_error(struct enic *enic)
 375 {
 376         unsigned int i;
 377         u32 error_status;
 378         bool err = false;
 379
 380         for (i = 0; i < enic->wq_count; i++) {
 381                 error_status = vnic_wq_error_status(&enic->wq[i]);
 382                 err |= error_status;
 383                 if (error_status)
 384                         netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 385                                 i, error_status);
 386         }
 387
 388         for (i = 0; i < enic->rq_count; i++) {
 389                 error_status = vnic_rq_error_status(&enic->rq[i]);
 390                 err |= error_status;
 391                 if (error_status)
 392                         netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 393                                 i, error_status);
 394         }
 395
 396         return err;
 397 }
 398
 399 static void enic_msglvl_check(struct enic *enic)
 400 {
 401         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 402
 403         if (msg_enable != enic->msg_enable) {
 404                 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 405                         enic->msg_enable, msg_enable);
 406                 enic->msg_enable = msg_enable;
 407         }
 408 }
 409
 410 static void enic_mtu_check(struct enic *enic)
 411 {
 412         u32 mtu = vnic_dev_mtu(enic->vdev);
 413         struct net_device *netdev = enic->netdev;
 414
 415         if (mtu && mtu != enic->port_mtu) {
 416                 enic->port_mtu = mtu;
 417                 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 418                         mtu = max_t(int, ENIC_MIN_MTU,
 419                                 min_t(int, ENIC_MAX_MTU, mtu));
 420                         if (mtu != netdev->mtu)
 421                                 schedule_work(&enic->change_mtu_work);
 422                 } else {
 423                         if (mtu < netdev->mtu)
 424                                 netdev_warn(netdev,
 425                                         "interface MTU (%d) set higher "
 426                                         "than switch port MTU (%d)\n",
 427                                         netdev->mtu, mtu);
 428                 }
 429         }
 430 }
 431
 432 static void enic_link_check(struct enic *enic)
 433 {
 434         int link_status = vnic_dev_link_status(enic->vdev);
 435         int carrier_ok = netif_carrier_ok(enic->netdev);
 436
 437         if (link_status && !carrier_ok) {
 438                 netdev_info(enic->netdev, "Link UP\n");
 439                 netif_carrier_on(enic->netdev);
 440         } else if (!link_status && carrier_ok) {
 441                 netdev_info(enic->netdev, "Link DOWN\n");
 442                 netif_carrier_off(enic->netdev);
 443         }
 444 }
 445
 446 static void enic_notify_check(struct enic *enic)
 447 {
 448         enic_msglvl_check(enic);
 449         enic_mtu_check(enic);
 450         enic_link_check(enic);
 451 }
 452
 453 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 454
 455 static irqreturn_t enic_isr_legacy(int irq, void *data)
 456 {
 457         struct net_device *netdev = data;
 458         struct enic *enic = netdev_priv(netdev);
 459         unsigned int io_intr = enic_legacy_io_intr();
 460         unsigned int err_intr = enic_legacy_err_intr();
 461         unsigned int notify_intr = enic_legacy_notify_intr();
 462         u32 pba;
 463
 464         vnic_intr_mask(&enic->intr[io_intr]);
 465
 466         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 467         if (!pba) {
 468                 vnic_intr_unmask(&enic->intr[io_intr]);
 469                 return IRQ_NONE;        /* not our interrupt */
 470         }
 471
 472         if (ENIC_TEST_INTR(pba, notify_intr)) {
 473                 enic_notify_check(enic);
 474                 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 475         }
 476
 477         if (ENIC_TEST_INTR(pba, err_intr)) {
 478                 vnic_intr_return_all_credits(&enic->intr[err_intr]);
 479                 enic_log_q_error(enic);
 480                 /* schedule recovery from WQ/RQ error */
 481                 schedule_work(&enic->reset);
 482                 return IRQ_HANDLED;
 483         }
 484
 485         if (ENIC_TEST_INTR(pba, io_intr))
 486                 napi_schedule_irqoff(&enic->napi[0]);
 487         else
 488                 vnic_intr_unmask(&enic->intr[io_intr]);
 489
 490         return IRQ_HANDLED;
 491 }
 492
 493 static irqreturn_t enic_isr_msi(int irq, void *data)
 494 {
 495         struct enic *enic = data;
 496
 497         /* With MSI, there is no sharing of interrupts, so this is
 498          * our interrupt and there is no need to ack it.  The device
 499          * is not providing per-vector masking, so the OS will not
 500          * write to PCI config space to mask/unmask the interrupt.
 501          * We're using mask_on_assertion for MSI, so the device
 502          * automatically masks the interrupt when the interrupt is
 503          * generated.  Later, when exiting polling, the interrupt
 504          * will be unmasked (see enic_poll).
 505          *
 506          * Also, the device uses the same PCIe Traffic Class (TC)
 507          * for Memory Write data and MSI, so there are no ordering
 508          * issues; the MSI will always arrive at the Root Complex
 509          * _after_ corresponding Memory Writes (i.e. descriptor
 510          * writes).
 511          */
 512
 513         napi_schedule_irqoff(&enic->napi[0]);
 514
 515         return IRQ_HANDLED;
 516 }
 517
 518 static irqreturn_t enic_isr_msix(int irq, void *data)
 519 {
 520         struct napi_struct *napi = data;
 521
 522         napi_schedule_irqoff(napi);
 523
 524         return IRQ_HANDLED;
 525 }
 526
 527 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 528 {
 529         struct enic *enic = data;
 530         unsigned int intr = enic_msix_err_intr(enic);
 531
 532         vnic_intr_return_all_credits(&enic->intr[intr]);
 533
 534         if (enic_log_q_error(enic))
 535                 /* schedule recovery from WQ/RQ error */
 536                 schedule_work(&enic->reset);
 537
 538         return IRQ_HANDLED;
 539 }
 540
 541 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 542 {
 543         struct enic *enic = data;
 544         unsigned int intr = enic_msix_notify_intr(enic);
 545
 546         enic_notify_check(enic);
 547         vnic_intr_return_all_credits(&enic->intr[intr]);
 548
 549         return IRQ_HANDLED;
 550 }
 551
 552 static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
 553                                   struct sk_buff *skb, unsigned int len_left,
 554                                   int loopback)
 555 {
 556         const skb_frag_t *frag;
 557         dma_addr_t dma_addr;
 558
 559         /* Queue additional data fragments */
 560         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 561                 len_left -= skb_frag_size(frag);
 562                 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
 563                                             skb_frag_size(frag),
 564                                             DMA_TO_DEVICE);
 565                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 566                         return -ENOMEM;
 567                 enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
 568                                         (len_left == 0),        /* EOP? */
 569                                         loopback);
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
 576                                   struct sk_buff *skb, int vlan_tag_insert,
 577                                   unsigned int vlan_tag, int loopback)
 578 {
 579         unsigned int head_len = skb_headlen(skb);
 580         unsigned int len_left = skb->len - head_len;
 581         int eop = (len_left == 0);
 582         dma_addr_t dma_addr;
 583         int err = 0;
 584
 585         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 586                                   PCI_DMA_TODEVICE);
 587         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 588                 return -ENOMEM;
 589
 590         /* Queue the main skb fragment. The fragments are no larger
 591          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 592          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 593          * per fragment is queued.
 594          */
 595         enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert,
 596                            vlan_tag, eop, loopback);
 597
 598         if (!eop)
 599                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 600
 601         return err;
 602 }
 603
 604 static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
 605                                      struct sk_buff *skb, int vlan_tag_insert,
 606                                      unsigned int vlan_tag, int loopback)
 607 {
 608         unsigned int head_len = skb_headlen(skb);
 609         unsigned int len_left = skb->len - head_len;
 610         unsigned int hdr_len = skb_checksum_start_offset(skb);
 611         unsigned int csum_offset = hdr_len + skb->csum_offset;
 612         int eop = (len_left == 0);
 613         dma_addr_t dma_addr;
 614         int err = 0;
 615
 616         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 617                                   PCI_DMA_TODEVICE);
 618         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 619                 return -ENOMEM;
 620
 621         /* Queue the main skb fragment. The fragments are no larger
 622          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 623          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 624          * per fragment is queued.
 625          */
 626         enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset,
 627                                    hdr_len, vlan_tag_insert, vlan_tag, eop,
 628                                    loopback);
 629
 630         if (!eop)
 631                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 632
 633         return err;
 634 }
 635
 636 static void enic_preload_tcp_csum_encap(struct sk_buff *skb)
 637 {
 638         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 639                 inner_ip_hdr(skb)->check = 0;
 640                 inner_tcp_hdr(skb)->check =
 641                         ~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
 642                                            inner_ip_hdr(skb)->daddr, 0,
 643                                            IPPROTO_TCP, 0);
 644         }
 645 }
 646
 647 static void enic_preload_tcp_csum(struct sk_buff *skb)
 648 {
 649         /* Preload TCP csum field with IP pseudo hdr calculated
 650          * with IP length set to zero.  HW will later add in length
 651          * to each TCP segment resulting from the TSO.
 652          */
 653
 654         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 655                 ip_hdr(skb)->check = 0;
 656                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 657                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 658         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 659                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 660                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 661         }
 662 }
 663
 664 static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
 665                                  struct sk_buff *skb, unsigned int mss,
 666                                  int vlan_tag_insert, unsigned int vlan_tag,
 667                                  int loopback)
 668 {
 669         unsigned int frag_len_left = skb_headlen(skb);
 670         unsigned int len_left = skb->len - frag_len_left;
 671         int eop = (len_left == 0);
 672         unsigned int offset = 0;
 673         unsigned int hdr_len;
 674         dma_addr_t dma_addr;
 675         unsigned int len;
 676         skb_frag_t *frag;
 677
 678         if (skb->encapsulation) {
 679                 hdr_len = skb_inner_transport_header(skb) - skb->data;
 680                 hdr_len += inner_tcp_hdrlen(skb);
 681                 enic_preload_tcp_csum_encap(skb);
 682         } else {
 683                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 684                 enic_preload_tcp_csum(skb);
 685         }
 686
 687         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 688          * for the main skb fragment
 689          */
 690         while (frag_len_left) {
 691                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 692                 dma_addr = pci_map_single(enic->pdev, skb->data + offset, len,
 693                                           PCI_DMA_TODEVICE);
 694                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 695                         return -ENOMEM;
 696                 enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
 697                                        vlan_tag_insert, vlan_tag,
 698                                        eop && (len == frag_len_left), loopback);
 699                 frag_len_left -= len;
 700                 offset += len;
 701         }
 702
 703         if (eop)
 704                 return 0;
 705
 706         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 707          * for additional data fragments
 708          */
 709         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 710                 len_left -= skb_frag_size(frag);
 711                 frag_len_left = skb_frag_size(frag);
 712                 offset = 0;
 713
 714                 while (frag_len_left) {
 715                         len = min(frag_len_left,
 716                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 717                         dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 718                                                     offset, len,
 719                                                     DMA_TO_DEVICE);
 720                         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 721                                 return -ENOMEM;
 722                         enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
 723                                                 (len_left == 0) &&
 724                                                  (len == frag_len_left),/*EOP*/
 725                                                 loopback);
 726                         frag_len_left -= len;
 727                         offset += len;
 728                 }
 729         }
 730
 731         return 0;
 732 }
 733
 734 static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq,
 735                                           struct sk_buff *skb,
 736                                           int vlan_tag_insert,
 737                                           unsigned int vlan_tag, int loopback)
 738 {
 739         unsigned int head_len = skb_headlen(skb);
 740         unsigned int len_left = skb->len - head_len;
 741         /* Hardware will overwrite the checksum fields, calculating from
 742          * scratch and ignoring the value placed by software.
 743          * Offload mode = 00
 744          * mss[2], mss[1], mss[0] bits are set
 745          */
 746         unsigned int mss_or_csum = 7;
 747         int eop = (len_left == 0);
 748         dma_addr_t dma_addr;
 749         int err = 0;
 750
 751         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 752                                   PCI_DMA_TODEVICE);
 753         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 754                 return -ENOMEM;
 755
 756         enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0,
 757                               vlan_tag_insert, vlan_tag,
 758                               WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop,
 759                               loopback);
 760         if (!eop)
 761                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 762
 763         return err;
 764 }
 765
 766 static inline void enic_queue_wq_skb(struct enic *enic,
 767         struct vnic_wq *wq, struct sk_buff *skb)
 768 {
 769         unsigned int mss = skb_shinfo(skb)->gso_size;
 770         unsigned int vlan_tag = 0;
 771         int vlan_tag_insert = 0;
 772         int loopback = 0;
 773         int err;
 774
 775         if (skb_vlan_tag_present(skb)) {
 776                 /* VLAN tag from trunking driver */
 777                 vlan_tag_insert = 1;
 778                 vlan_tag = skb_vlan_tag_get(skb);
 779         } else if (enic->loop_enable) {
 780                 vlan_tag = enic->loop_tag;
 781                 loopback = 1;
 782         }
 783
 784         if (mss)
 785                 err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
 786                                             vlan_tag_insert, vlan_tag,
 787                                             loopback);
 788         else if (skb->encapsulation)
 789                 err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert,
 790                                               vlan_tag, loopback);
 791         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 792                 err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
 793                                                 vlan_tag, loopback);
 794         else
 795                 err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
 796                                              vlan_tag, loopback);
 797         if (unlikely(err)) {
 798                 struct vnic_wq_buf *buf;
 799
 800                 buf = wq->to_use->prev;
 801                 /* while not EOP of previous pkt && queue not empty.
 802                  * For all non EOP bufs, os_buf is NULL.
 803                  */
 804                 while (!buf->os_buf && (buf->next != wq->to_clean)) {
 805                         enic_free_wq_buf(wq, buf);
 806                         wq->ring.desc_avail++;
 807                         buf = buf->prev;
 808                 }
 809                 wq->to_use = buf->next;
 810                 dev_kfree_skb(skb);
 811         }
 812 }
 813
 814 /* netif_tx_lock held, process context with BHs disabled, or BH */
 815 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 816         struct net_device *netdev)
 817 {
 818         struct enic *enic = netdev_priv(netdev);
 819         struct vnic_wq *wq;
 820         unsigned int txq_map;
 821         struct netdev_queue *txq;
 822
 823         if (skb->len <= 0) {
 824                 dev_kfree_skb_any(skb);
 825                 return NETDEV_TX_OK;
 826         }
 827
 828         txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 829         wq = &enic->wq[txq_map];
 830         txq = netdev_get_tx_queue(netdev, txq_map);
 831
 832         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 833          * which is very likely.  In the off chance it's going to take
 834          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 835          */
 836
 837         if (skb_shinfo(skb)->gso_size == 0 &&
 838             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 839             skb_linearize(skb)) {
 840                 dev_kfree_skb_any(skb);
 841                 return NETDEV_TX_OK;
 842         }
 843
 844         spin_lock(&enic->wq_lock[txq_map]);
 845
 846         if (vnic_wq_desc_avail(wq) <
 847             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 848                 netif_tx_stop_queue(txq);
 849                 /* This is a hard error, log it */
 850                 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 851                 spin_unlock(&enic->wq_lock[txq_map]);
 852                 return NETDEV_TX_BUSY;
 853         }
 854
 855         enic_queue_wq_skb(enic, wq, skb);
 856
 857         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 858                 netif_tx_stop_queue(txq);
 859         if (!skb->xmit_more || netif_xmit_stopped(txq))
 860                 vnic_wq_doorbell(wq);
 861
 862         spin_unlock(&enic->wq_lock[txq_map]);
 863
 864         return NETDEV_TX_OK;
 865 }
 866
 867 /* dev_base_lock rwlock held, nominally process context */
 868 static void enic_get_stats(struct net_device *netdev,
 869                            struct rtnl_link_stats64 *net_stats)
 870 {
 871         struct enic *enic = netdev_priv(netdev);
 872         struct vnic_stats *stats;
 873         int err;
 874
 875         err = enic_dev_stats_dump(enic, &stats);
 876         /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump
 877          * For other failures, like devcmd failure, we return previously
 878          * recorded stats.
 879          */
 880         if (err == -ENOMEM)
 881                 return;
 882
 883         net_stats->tx_packets = stats->tx.tx_frames_ok;
 884         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 885         net_stats->tx_errors = stats->tx.tx_errors;
 886         net_stats->tx_dropped = stats->tx.tx_drops;
 887
 888         net_stats->rx_packets = stats->rx.rx_frames_ok;
 889         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 890         net_stats->rx_errors = stats->rx.rx_errors;
 891         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 892         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 893         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 894         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 895 }
 896
 897 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 898 {
 899         struct enic *enic = netdev_priv(netdev);
 900
 901         if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 902                 unsigned int mc_count = netdev_mc_count(netdev);
 903
 904                 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 905                             ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 906
 907                 return -ENOSPC;
 908         }
 909
 910         enic_dev_add_addr(enic, mc_addr);
 911         enic->mc_count++;
 912
 913         return 0;
 914 }
 915
 916 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 917 {
 918         struct enic *enic = netdev_priv(netdev);
 919
 920         enic_dev_del_addr(enic, mc_addr);
 921         enic->mc_count--;
 922
 923         return 0;
 924 }
 925
 926 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 927 {
 928         struct enic *enic = netdev_priv(netdev);
 929
 930         if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 931                 unsigned int uc_count = netdev_uc_count(netdev);
 932
 933                 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 934                             ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 935
 936                 return -ENOSPC;
 937         }
 938
 939         enic_dev_add_addr(enic, uc_addr);
 940         enic->uc_count++;
 941
 942         return 0;
 943 }
 944
 945 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 946 {
 947         struct enic *enic = netdev_priv(netdev);
 948
 949         enic_dev_del_addr(enic, uc_addr);
 950         enic->uc_count--;
 951
 952         return 0;
 953 }
 954
 955 void enic_reset_addr_lists(struct enic *enic)
 956 {
 957         struct net_device *netdev = enic->netdev;
 958
 959         __dev_uc_unsync(netdev, NULL);
 960         __dev_mc_unsync(netdev, NULL);
 961
 962         enic->mc_count = 0;
 963         enic->uc_count = 0;
 964         enic->flags = 0;
 965 }
 966
 967 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 968 {
 969         struct enic *enic = netdev_priv(netdev);
 970
 971         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 972                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 973                         return -EADDRNOTAVAIL;
 974         } else {
 975                 if (!is_valid_ether_addr(addr))
 976                         return -EADDRNOTAVAIL;
 977         }
 978
 979         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 980
 981         return 0;
 982 }
 983
 984 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 985 {
 986         struct enic *enic = netdev_priv(netdev);
 987         struct sockaddr *saddr = p;
 988         char *addr = saddr->sa_data;
 989         int err;
 990
 991         if (netif_running(enic->netdev)) {
 992                 err = enic_dev_del_station_addr(enic);
 993                 if (err)
 994                         return err;
 995         }
 996
 997         err = enic_set_mac_addr(netdev, addr);
 998         if (err)
 999                 return err;
1000
1001         if (netif_running(enic->netdev)) {
1002                 err = enic_dev_add_station_addr(enic);
1003                 if (err)
1004                         return err;
1005         }
1006
1007         return err;
1008 }
1009
1010 static int enic_set_mac_address(struct net_device *netdev, void *p)
1011 {
1012         struct sockaddr *saddr = p;
1013         char *addr = saddr->sa_data;
1014         struct enic *enic = netdev_priv(netdev);
1015         int err;
1016
1017         err = enic_dev_del_station_addr(enic);
1018         if (err)
1019                 return err;
1020
1021         err = enic_set_mac_addr(netdev, addr);
1022         if (err)
1023                 return err;
1024
1025         return enic_dev_add_station_addr(enic);
1026 }
1027
1028 /* netif_tx_lock held, BHs disabled */
1029 static void enic_set_rx_mode(struct net_device *netdev)
1030 {
1031         struct enic *enic = netdev_priv(netdev);
1032         int directed = 1;
1033         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
1034         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
1035         int promisc = (netdev->flags & IFF_PROMISC) ||
1036                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
1037         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
1038                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
1039         unsigned int flags = netdev->flags |
1040                 (allmulti ? IFF_ALLMULTI : 0) |
1041                 (promisc ? IFF_PROMISC : 0);
1042
1043         if (enic->flags != flags) {
1044                 enic->flags = flags;
1045                 enic_dev_packet_filter(enic, directed,
1046                         multicast, broadcast, promisc, allmulti);
1047         }
1048
1049         if (!promisc) {
1050                 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
1051                 if (!allmulti)
1052                         __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
1053         }
1054 }
1055
1056 /* netif_tx_lock held, BHs disabled */
1057 static void enic_tx_timeout(struct net_device *netdev)
1058 {
1059         struct enic *enic = netdev_priv(netdev);
1060         schedule_work(&enic->tx_hang_reset);
1061 }
1062
1063 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
1064 {
1065         struct enic *enic = netdev_priv(netdev);
1066         struct enic_port_profile *pp;
1067         int err;
1068
1069         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1070         if (err)
1071                 return err;
1072
1073         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
1074                 if (vf == PORT_SELF_VF) {
1075                         memcpy(pp->vf_mac, mac, ETH_ALEN);
1076                         return 0;
1077                 } else {
1078                         /*
1079                          * For sriov vf's set the mac in hw
1080                          */
1081                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1082                                 vnic_dev_set_mac_addr, mac);
1083                         return enic_dev_status_to_errno(err);
1084                 }
1085         } else
1086                 return -EINVAL;
1087 }
1088
1089 static int enic_set_vf_port(struct net_device *netdev, int vf,
1090         struct nlattr *port[])
1091 {
1092         struct enic *enic = netdev_priv(netdev);
1093         struct enic_port_profile prev_pp;
1094         struct enic_port_profile *pp;
1095         int err = 0, restore_pp = 1;
1096
1097         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1098         if (err)
1099                 return err;
1100
1101         if (!port[IFLA_PORT_REQUEST])
1102                 return -EOPNOTSUPP;
1103
1104         memcpy(&prev_pp, pp, sizeof(*enic->pp));
1105         memset(pp, 0, sizeof(*enic->pp));
1106
1107         pp->set |= ENIC_SET_REQUEST;
1108         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
1109
1110         if (port[IFLA_PORT_PROFILE]) {
1111                 pp->set |= ENIC_SET_NAME;
1112                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
1113                         PORT_PROFILE_MAX);
1114         }
1115
1116         if (port[IFLA_PORT_INSTANCE_UUID]) {
1117                 pp->set |= ENIC_SET_INSTANCE;
1118                 memcpy(pp->instance_uuid,
1119                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
1120         }
1121
1122         if (port[IFLA_PORT_HOST_UUID]) {
1123                 pp->set |= ENIC_SET_HOST;
1124                 memcpy(pp->host_uuid,
1125                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
1126         }
1127
1128         if (vf == PORT_SELF_VF) {
1129                 /* Special case handling: mac came from IFLA_VF_MAC */
1130                 if (!is_zero_ether_addr(prev_pp.vf_mac))
1131                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
1132
1133                 if (is_zero_ether_addr(netdev->dev_addr))
1134                         eth_hw_addr_random(netdev);
1135         } else {
1136                 /* SR-IOV VF: get mac from adapter */
1137                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1138                         vnic_dev_get_mac_addr, pp->mac_addr);
1139                 if (err) {
1140                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
1141                         memcpy(pp, &prev_pp, sizeof(*pp));
1142                         return enic_dev_status_to_errno(err);
1143                 }
1144         }
1145
1146         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
1147         if (err) {
1148                 if (restore_pp) {
1149                         /* Things are still the way they were: Implicit
1150                          * DISASSOCIATE failed
1151                          */
1152                         memcpy(pp, &prev_pp, sizeof(*pp));
1153                 } else {
1154                         memset(pp, 0, sizeof(*pp));
1155                         if (vf == PORT_SELF_VF)
1156                                 eth_zero_addr(netdev->dev_addr);
1157                 }
1158         } else {
1159                 /* Set flag to indicate that the port assoc/disassoc
1160                  * request has been sent out to fw
1161                  */
1162                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
1163
1164                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
1165                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
1166                         eth_zero_addr(pp->mac_addr);
1167                         if (vf == PORT_SELF_VF)
1168                                 eth_zero_addr(netdev->dev_addr);
1169                 }
1170         }
1171
1172         if (vf == PORT_SELF_VF)
1173                 eth_zero_addr(pp->vf_mac);
1174
1175         return err;
1176 }
1177
1178 static int enic_get_vf_port(struct net_device *netdev, int vf,
1179         struct sk_buff *skb)
1180 {
1181         struct enic *enic = netdev_priv(netdev);
1182         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
1183         struct enic_port_profile *pp;
1184         int err;
1185
1186         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1187         if (err)
1188                 return err;
1189
1190         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
1191                 return -ENODATA;
1192
1193         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
1194         if (err)
1195                 return err;
1196
1197         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
1198             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
1199             ((pp->set & ENIC_SET_NAME) &&
1200              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
1201             ((pp->set & ENIC_SET_INSTANCE) &&
1202              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
1203                      pp->instance_uuid)) ||
1204             ((pp->set & ENIC_SET_HOST) &&
1205              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
1206                 goto nla_put_failure;
1207         return 0;
1208
1209 nla_put_failure:
1210         return -EMSGSIZE;
1211 }
1212
1213 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1214 {
1215         struct enic *enic = vnic_dev_priv(rq->vdev);
1216
1217         if (!buf->os_buf)
1218                 return;
1219
1220         pci_unmap_single(enic->pdev, buf->dma_addr,
1221                 buf->len, PCI_DMA_FROMDEVICE);
1222         dev_kfree_skb_any(buf->os_buf);
1223         buf->os_buf = NULL;
1224 }
1225
1226 static int enic_rq_alloc_buf(struct vnic_rq *rq)
1227 {
1228         struct enic *enic = vnic_dev_priv(rq->vdev);
1229         struct net_device *netdev = enic->netdev;
1230         struct sk_buff *skb;
1231         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
1232         unsigned int os_buf_index = 0;
1233         dma_addr_t dma_addr;
1234         struct vnic_rq_buf *buf = rq->to_use;
1235
1236         if (buf->os_buf) {
1237                 enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
1238                                    buf->len);
1239
1240                 return 0;
1241         }
1242         skb = netdev_alloc_skb_ip_align(netdev, len);
1243         if (!skb)
1244                 return -ENOMEM;
1245
1246         dma_addr = pci_map_single(enic->pdev, skb->data, len,
1247                                   PCI_DMA_FROMDEVICE);
1248         if (unlikely(enic_dma_map_check(enic, dma_addr))) {
1249                 dev_kfree_skb(skb);
1250                 return -ENOMEM;
1251         }
1252
1253         enic_queue_rq_desc(rq, skb, os_buf_index,
1254                 dma_addr, len);
1255
1256         return 0;
1257 }
1258
1259 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1260                                       u32 pkt_len)
1261 {
1262         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1263                 pkt_size->large_pkt_bytes_cnt += pkt_len;
1264         else
1265                 pkt_size->small_pkt_bytes_cnt += pkt_len;
1266 }
1267
1268 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1269                              struct vnic_rq_buf *buf, u16 len)
1270 {
1271         struct enic *enic = netdev_priv(netdev);
1272         struct sk_buff *new_skb;
1273
1274         if (len > enic->rx_copybreak)
1275                 return false;
1276         new_skb = netdev_alloc_skb_ip_align(netdev, len);
1277         if (!new_skb)
1278                 return false;
1279         pci_dma_sync_single_for_cpu(enic->pdev, buf->dma_addr, len,
1280                                     DMA_FROM_DEVICE);
1281         memcpy(new_skb->data, (*skb)->data, len);
1282         *skb = new_skb;
1283
1284         return true;
1285 }
1286
1287 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1288         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1289         int skipped, void *opaque)
1290 {
1291         struct enic *enic = vnic_dev_priv(rq->vdev);
1292         struct net_device *netdev = enic->netdev;
1293         struct sk_buff *skb;
1294         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1295
1296         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1297         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1298         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1299         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1300         u8 packet_error;
1301         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1302         u32 rss_hash;
1303         bool outer_csum_ok = true, encap = false;
1304
1305         if (skipped)
1306                 return;
1307
1308         skb = buf->os_buf;
1309
1310         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1311                 &type, &color, &q_number, &completed_index,
1312                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1313                 &csum_not_calc, &rss_hash, &bytes_written,
1314                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1315                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1316                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1317                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1318                 &fcs_ok);
1319
1320         if (packet_error) {
1321
1322                 if (!fcs_ok) {
1323                         if (bytes_written > 0)
1324                                 enic->rq_bad_fcs++;
1325                         else if (bytes_written == 0)
1326                                 enic->rq_truncated_pkts++;
1327                 }
1328
1329                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1330                                  PCI_DMA_FROMDEVICE);
1331                 dev_kfree_skb_any(skb);
1332                 buf->os_buf = NULL;
1333
1334                 return;
1335         }
1336
1337         if (eop && bytes_written > 0) {
1338
1339                 /* Good receive
1340                  */
1341
1342                 if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1343                         buf->os_buf = NULL;
1344                         pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1345                                          PCI_DMA_FROMDEVICE);
1346                 }
1347                 prefetch(skb->data - NET_IP_ALIGN);
1348
1349                 skb_put(skb, bytes_written);
1350                 skb->protocol = eth_type_trans(skb, netdev);
1351                 skb_record_rx_queue(skb, q_number);
1352                 if ((netdev->features & NETIF_F_RXHASH) && rss_hash &&
1353                     (type == 3)) {
1354                         switch (rss_type) {
1355                         case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv4:
1356                         case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6:
1357                         case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6_EX:
1358                                 skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L4);
1359                                 break;
1360                         case CQ_ENET_RQ_DESC_RSS_TYPE_IPv4:
1361                         case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6:
1362                         case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6_EX:
1363                                 skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L3);
1364                                 break;
1365                         }
1366                 }
1367                 if (enic->vxlan.vxlan_udp_port_number) {
1368                         switch (enic->vxlan.patch_level) {
1369                         case 0:
1370                                 if (fcoe) {
1371                                         encap = true;
1372                                         outer_csum_ok = fcoe_fc_crc_ok;
1373                                 }
1374                                 break;
1375                         case 2:
1376                                 if ((type == 7) &&
1377                                     (rss_hash & BIT(0))) {
1378                                         encap = true;
1379                                         outer_csum_ok = (rss_hash & BIT(1)) &&
1380                                                         (rss_hash & BIT(2));
1381                                 }
1382                                 break;
1383                         }
1384                 }
1385
1386                 /* Hardware does not provide whole packet checksum. It only
1387                  * provides pseudo checksum. Since hw validates the packet
1388                  * checksum but not provide us the checksum value. use
1389                  * CHECSUM_UNNECESSARY.
1390                  *
1391                  * In case of encap pkt tcp_udp_csum_ok/tcp_udp_csum_ok is
1392                  * inner csum_ok. outer_csum_ok is set by hw when outer udp
1393                  * csum is correct or is zero.
1394                  */
1395                 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc &&
1396                     tcp_udp_csum_ok && outer_csum_ok &&
1397                     (ipv4_csum_ok || ipv6)) {
1398                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1399                         skb->csum_level = encap;
1400                 }
1401
1402                 if (vlan_stripped)
1403                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1404
1405                 skb_mark_napi_id(skb, &enic->napi[rq->index]);
1406                 if (!(netdev->features & NETIF_F_GRO))
1407                         netif_receive_skb(skb);
1408                 else
1409                         napi_gro_receive(&enic->napi[q_number], skb);
1410                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1411                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1412                                                   bytes_written);
1413         } else {
1414
1415                 /* Buffer overflow
1416                  */
1417
1418                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1419                                  PCI_DMA_FROMDEVICE);
1420                 dev_kfree_skb_any(skb);
1421                 buf->os_buf = NULL;
1422         }
1423 }
1424
1425 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1426         u8 type, u16 q_number, u16 completed_index, void *opaque)
1427 {
1428         struct enic *enic = vnic_dev_priv(vdev);
1429
1430         vnic_rq_service(&enic->rq[q_number], cq_desc,
1431                 completed_index, VNIC_RQ_RETURN_DESC,
1432                 enic_rq_indicate_buf, opaque);
1433
1434         return 0;
1435 }
1436
1437 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1438 {
1439         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1440         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1441         u32 timer = cq->tobe_rx_coal_timeval;
1442
1443         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1444                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1445                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1446         }
1447 }
1448
1449 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1450 {
1451         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1452         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1453         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1454         int index;
1455         u32 timer;
1456         u32 range_start;
1457         u32 traffic;
1458         u64 delta;
1459         ktime_t now = ktime_get();
1460
1461         delta = ktime_us_delta(now, cq->prev_ts);
1462         if (delta < ENIC_AIC_TS_BREAK)
1463                 return;
1464         cq->prev_ts = now;
1465
1466         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1467                   pkt_size_counter->small_pkt_bytes_cnt;
1468         /* The table takes Mbps
1469          * traffic *= 8    => bits
1470          * traffic *= (10^6 / delta)    => bps
1471          * traffic /= 10^6     => Mbps
1472          *
1473          * Combining, traffic *= (8 / delta)
1474          */
1475
1476         traffic <<= 3;
1477         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1478
1479         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1480                 if (traffic < mod_table[index].rx_rate)
1481                         break;
1482         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1483                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1484                       rx_coal->small_pkt_range_start :
1485                       rx_coal->large_pkt_range_start;
1486         timer = range_start + ((rx_coal->range_end - range_start) *
1487                                mod_table[index].range_percent / 100);
1488         /* Damping */
1489         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1490
1491         pkt_size_counter->large_pkt_bytes_cnt = 0;
1492         pkt_size_counter->small_pkt_bytes_cnt = 0;
1493 }
1494
1495 static int enic_poll(struct napi_struct *napi, int budget)
1496 {
1497         struct net_device *netdev = napi->dev;
1498         struct enic *enic = netdev_priv(netdev);
1499         unsigned int cq_rq = enic_cq_rq(enic, 0);
1500         unsigned int cq_wq = enic_cq_wq(enic, 0);
1501         unsigned int intr = enic_legacy_io_intr();
1502         unsigned int rq_work_to_do = budget;
1503         unsigned int wq_work_to_do = -1; /* no limit */
1504         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1505         int err;
1506
1507         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1508                                        enic_wq_service, NULL);
1509
1510         if (budget > 0)
1511                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1512                         rq_work_to_do, enic_rq_service, NULL);
1513
1514         /* Accumulate intr event credits for this polling
1515          * cycle.  An intr event is the completion of a
1516          * a WQ or RQ packet.
1517          */
1518
1519         work_done = rq_work_done + wq_work_done;
1520
1521         if (work_done > 0)
1522                 vnic_intr_return_credits(&enic->intr[intr],
1523                         work_done,
1524                         0 /* don't unmask intr */,
1525                         0 /* don't reset intr timer */);
1526
1527         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1528
1529         /* Buffer allocation failed. Stay in polling
1530          * mode so we can try to fill the ring again.
1531          */
1532
1533         if (err)
1534                 rq_work_done = rq_work_to_do;
1535         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1536                 /* Call the function which refreshes the intr coalescing timer
1537                  * value based on the traffic.
1538                  */
1539                 enic_calc_int_moderation(enic, &enic->rq[0]);
1540
1541         if ((rq_work_done < budget) && napi_complete_done(napi, rq_work_done)) {
1542
1543                 /* Some work done, but not enough to stay in polling,
1544                  * exit polling
1545                  */
1546
1547                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1548                         enic_set_int_moderation(enic, &enic->rq[0]);
1549                 vnic_intr_unmask(&enic->intr[intr]);
1550         }
1551
1552         return rq_work_done;
1553 }
1554
1555 #ifdef CONFIG_RFS_ACCEL
1556 static void enic_free_rx_cpu_rmap(struct enic *enic)
1557 {
1558         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1559         enic->netdev->rx_cpu_rmap = NULL;
1560 }
1561
1562 static void enic_set_rx_cpu_rmap(struct enic *enic)
1563 {
1564         int i, res;
1565
1566         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1567                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1568                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1569                         return;
1570                 for (i = 0; i < enic->rq_count; i++) {
1571                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1572                                                enic->msix_entry[i].vector);
1573                         if (unlikely(res)) {
1574                                 enic_free_rx_cpu_rmap(enic);
1575                                 return;
1576                         }
1577                 }
1578         }
1579 }
1580
1581 #else
1582
1583 static void enic_free_rx_cpu_rmap(struct enic *enic)
1584 {
1585 }
1586
1587 static void enic_set_rx_cpu_rmap(struct enic *enic)
1588 {
1589 }
1590
1591 #endif /* CONFIG_RFS_ACCEL */
1592
1593 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1594 {
1595         struct net_device *netdev = napi->dev;
1596         struct enic *enic = netdev_priv(netdev);
1597         unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1598         struct vnic_wq *wq = &enic->wq[wq_index];
1599         unsigned int cq;
1600         unsigned int intr;
1601         unsigned int wq_work_to_do = -1; /* clean all desc possible */
1602         unsigned int wq_work_done;
1603         unsigned int wq_irq;
1604
1605         wq_irq = wq->index;
1606         cq = enic_cq_wq(enic, wq_irq);
1607         intr = enic_msix_wq_intr(enic, wq_irq);
1608         wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1609                                        enic_wq_service, NULL);
1610
1611         vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1612                                  0 /* don't unmask intr */,
1613                                  1 /* reset intr timer */);
1614         if (!wq_work_done) {
1615                 napi_complete(napi);
1616                 vnic_intr_unmask(&enic->intr[intr]);
1617                 return 0;
1618         }
1619
1620         return budget;
1621 }
1622
1623 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1624 {
1625         struct net_device *netdev = napi->dev;
1626         struct enic *enic = netdev_priv(netdev);
1627         unsigned int rq = (napi - &enic->napi[0]);
1628         unsigned int cq = enic_cq_rq(enic, rq);
1629         unsigned int intr = enic_msix_rq_intr(enic, rq);
1630         unsigned int work_to_do = budget;
1631         unsigned int work_done = 0;
1632         int err;
1633
1634         /* Service RQ
1635          */
1636
1637         if (budget > 0)
1638                 work_done = vnic_cq_service(&enic->cq[cq],
1639                         work_to_do, enic_rq_service, NULL);
1640
1641         /* Return intr event credits for this polling
1642          * cycle.  An intr event is the completion of a
1643          * RQ packet.
1644          */
1645
1646         if (work_done > 0)
1647                 vnic_intr_return_credits(&enic->intr[intr],
1648                         work_done,
1649                         0 /* don't unmask intr */,
1650                         0 /* don't reset intr timer */);
1651
1652         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1653
1654         /* Buffer allocation failed. Stay in polling mode
1655          * so we can try to fill the ring again.
1656          */
1657
1658         if (err)
1659                 work_done = work_to_do;
1660         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1661                 /* Call the function which refreshes the intr coalescing timer
1662                  * value based on the traffic.
1663                  */
1664                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1665
1666         if ((work_done < budget) && napi_complete_done(napi, work_done)) {
1667
1668                 /* Some work done, but not enough to stay in polling,
1669                  * exit polling
1670                  */
1671
1672                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1673                         enic_set_int_moderation(enic, &enic->rq[rq]);
1674                 vnic_intr_unmask(&enic->intr[intr]);
1675         }
1676
1677         return work_done;
1678 }
1679
1680 static void enic_notify_timer(unsigned long data)
1681 {
1682         struct enic *enic = (struct enic *)data;
1683
1684         enic_notify_check(enic);
1685
1686         mod_timer(&enic->notify_timer,
1687                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1688 }
1689
1690 static void enic_free_intr(struct enic *enic)
1691 {
1692         struct net_device *netdev = enic->netdev;
1693         unsigned int i;
1694
1695         enic_free_rx_cpu_rmap(enic);
1696         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1697         case VNIC_DEV_INTR_MODE_INTX:
1698                 free_irq(enic->pdev->irq, netdev);
1699                 break;
1700         case VNIC_DEV_INTR_MODE_MSI:
1701                 free_irq(enic->pdev->irq, enic);
1702                 break;
1703         case VNIC_DEV_INTR_MODE_MSIX:
1704                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1705                         if (enic->msix[i].requested)
1706                                 free_irq(enic->msix_entry[i].vector,
1707                                         enic->msix[i].devid);
1708                 break;
1709         default:
1710                 break;
1711         }
1712 }
1713
1714 static int enic_request_intr(struct enic *enic)
1715 {
1716         struct net_device *netdev = enic->netdev;
1717         unsigned int i, intr;
1718         int err = 0;
1719
1720         enic_set_rx_cpu_rmap(enic);
1721         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1722
1723         case VNIC_DEV_INTR_MODE_INTX:
1724
1725                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1726                         IRQF_SHARED, netdev->name, netdev);
1727                 break;
1728
1729         case VNIC_DEV_INTR_MODE_MSI:
1730
1731                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1732                         0, netdev->name, enic);
1733                 break;
1734
1735         case VNIC_DEV_INTR_MODE_MSIX:
1736
1737                 for (i = 0; i < enic->rq_count; i++) {
1738                         intr = enic_msix_rq_intr(enic, i);
1739                         snprintf(enic->msix[intr].devname,
1740                                 sizeof(enic->msix[intr].devname),
1741                                 "%s-rx-%u", netdev->name, i);
1742                         enic->msix[intr].isr = enic_isr_msix;
1743                         enic->msix[intr].devid = &enic->napi[i];
1744                 }
1745
1746                 for (i = 0; i < enic->wq_count; i++) {
1747                         int wq = enic_cq_wq(enic, i);
1748
1749                         intr = enic_msix_wq_intr(enic, i);
1750                         snprintf(enic->msix[intr].devname,
1751                                 sizeof(enic->msix[intr].devname),
1752                                 "%s-tx-%u", netdev->name, i);
1753                         enic->msix[intr].isr = enic_isr_msix;
1754                         enic->msix[intr].devid = &enic->napi[wq];
1755                 }
1756
1757                 intr = enic_msix_err_intr(enic);
1758                 snprintf(enic->msix[intr].devname,
1759                         sizeof(enic->msix[intr].devname),
1760                         "%s-err", netdev->name);
1761                 enic->msix[intr].isr = enic_isr_msix_err;
1762                 enic->msix[intr].devid = enic;
1763
1764                 intr = enic_msix_notify_intr(enic);
1765                 snprintf(enic->msix[intr].devname,
1766                         sizeof(enic->msix[intr].devname),
1767                         "%s-notify", netdev->name);
1768                 enic->msix[intr].isr = enic_isr_msix_notify;
1769                 enic->msix[intr].devid = enic;
1770
1771                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1772                         enic->msix[i].requested = 0;
1773
1774                 for (i = 0; i < enic->intr_count; i++) {
1775                         err = request_irq(enic->msix_entry[i].vector,
1776                                 enic->msix[i].isr, 0,
1777                                 enic->msix[i].devname,
1778                                 enic->msix[i].devid);
1779                         if (err) {
1780                                 enic_free_intr(enic);
1781                                 break;
1782                         }
1783                         enic->msix[i].requested = 1;
1784                 }
1785
1786                 break;
1787
1788         default:
1789                 break;
1790         }
1791
1792         return err;
1793 }
1794
1795 static void enic_synchronize_irqs(struct enic *enic)
1796 {
1797         unsigned int i;
1798
1799         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1800         case VNIC_DEV_INTR_MODE_INTX:
1801         case VNIC_DEV_INTR_MODE_MSI:
1802                 synchronize_irq(enic->pdev->irq);
1803                 break;
1804         case VNIC_DEV_INTR_MODE_MSIX:
1805                 for (i = 0; i < enic->intr_count; i++)
1806                         synchronize_irq(enic->msix_entry[i].vector);
1807                 break;
1808         default:
1809                 break;
1810         }
1811 }
1812
1813 static void enic_set_rx_coal_setting(struct enic *enic)
1814 {
1815         unsigned int speed;
1816         int index = -1;
1817         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1818
1819         /* 1. Read the link speed from fw
1820          * 2. Pick the default range for the speed
1821          * 3. Update it in enic->rx_coalesce_setting
1822          */
1823         speed = vnic_dev_port_speed(enic->vdev);
1824         if (ENIC_LINK_SPEED_10G < speed)
1825                 index = ENIC_LINK_40G_INDEX;
1826         else if (ENIC_LINK_SPEED_4G < speed)
1827                 index = ENIC_LINK_10G_INDEX;
1828         else
1829                 index = ENIC_LINK_4G_INDEX;
1830
1831         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1832         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1833         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1834
1835         /* Start with the value provided by UCSM */
1836         for (index = 0; index < enic->rq_count; index++)
1837                 enic->cq[index].cur_rx_coal_timeval =
1838                                 enic->config.intr_timer_usec;
1839
1840         rx_coal->use_adaptive_rx_coalesce = 1;
1841 }
1842
1843 static int enic_dev_notify_set(struct enic *enic)
1844 {
1845         int err;
1846
1847         spin_lock_bh(&enic->devcmd_lock);
1848         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1849         case VNIC_DEV_INTR_MODE_INTX:
1850                 err = vnic_dev_notify_set(enic->vdev,
1851                         enic_legacy_notify_intr());
1852                 break;
1853         case VNIC_DEV_INTR_MODE_MSIX:
1854                 err = vnic_dev_notify_set(enic->vdev,
1855                         enic_msix_notify_intr(enic));
1856                 break;
1857         default:
1858                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1859                 break;
1860         }
1861         spin_unlock_bh(&enic->devcmd_lock);
1862
1863         return err;
1864 }
1865
1866 static void enic_notify_timer_start(struct enic *enic)
1867 {
1868         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1869         case VNIC_DEV_INTR_MODE_MSI:
1870                 mod_timer(&enic->notify_timer, jiffies);
1871                 break;
1872         default:
1873                 /* Using intr for notification for INTx/MSI-X */
1874                 break;
1875         }
1876 }
1877
1878 /* rtnl lock is held, process context */
1879 static int enic_open(struct net_device *netdev)
1880 {
1881         struct enic *enic = netdev_priv(netdev);
1882         unsigned int i;
1883         int err, ret;
1884
1885         err = enic_request_intr(enic);
1886         if (err) {
1887                 netdev_err(netdev, "Unable to request irq.\n");
1888                 return err;
1889         }
1890         enic_init_affinity_hint(enic);
1891         enic_set_affinity_hint(enic);
1892
1893         err = enic_dev_notify_set(enic);
1894         if (err) {
1895                 netdev_err(netdev,
1896                         "Failed to alloc notify buffer, aborting.\n");
1897                 goto err_out_free_intr;
1898         }
1899
1900         for (i = 0; i < enic->rq_count; i++) {
1901                 /* enable rq before updating rq desc */
1902                 vnic_rq_enable(&enic->rq[i]);
1903                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1904                 /* Need at least one buffer on ring to get going */
1905                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1906                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1907                         err = -ENOMEM;
1908                         goto err_out_free_rq;
1909                 }
1910         }
1911
1912         for (i = 0; i < enic->wq_count; i++)
1913                 vnic_wq_enable(&enic->wq[i]);
1914
1915         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1916                 enic_dev_add_station_addr(enic);
1917
1918         enic_set_rx_mode(netdev);
1919
1920         netif_tx_wake_all_queues(netdev);
1921
1922         for (i = 0; i < enic->rq_count; i++)
1923                 napi_enable(&enic->napi[i]);
1924
1925         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1926                 for (i = 0; i < enic->wq_count; i++)
1927                         napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1928         enic_dev_enable(enic);
1929
1930         for (i = 0; i < enic->intr_count; i++)
1931                 vnic_intr_unmask(&enic->intr[i]);
1932
1933         enic_notify_timer_start(enic);
1934         enic_rfs_timer_start(enic);
1935
1936         return 0;
1937
1938 err_out_free_rq:
1939         for (i = 0; i < enic->rq_count; i++) {
1940                 ret = vnic_rq_disable(&enic->rq[i]);
1941                 if (!ret)
1942                         vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1943         }
1944         enic_dev_notify_unset(enic);
1945 err_out_free_intr:
1946         enic_unset_affinity_hint(enic);
1947         enic_free_intr(enic);
1948
1949         return err;
1950 }
1951
1952 /* rtnl lock is held, process context */
1953 static int enic_stop(struct net_device *netdev)
1954 {
1955         struct enic *enic = netdev_priv(netdev);
1956         unsigned int i;
1957         int err;
1958
1959         for (i = 0; i < enic->intr_count; i++) {
1960                 vnic_intr_mask(&enic->intr[i]);
1961                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1962         }
1963
1964         enic_synchronize_irqs(enic);
1965
1966         del_timer_sync(&enic->notify_timer);
1967         enic_rfs_flw_tbl_free(enic);
1968
1969         enic_dev_disable(enic);
1970
1971         for (i = 0; i < enic->rq_count; i++)
1972                 napi_disable(&enic->napi[i]);
1973
1974         netif_carrier_off(netdev);
1975         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1976                 for (i = 0; i < enic->wq_count; i++)
1977                         napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1978         netif_tx_disable(netdev);
1979
1980         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1981                 enic_dev_del_station_addr(enic);
1982
1983         for (i = 0; i < enic->wq_count; i++) {
1984                 err = vnic_wq_disable(&enic->wq[i]);
1985                 if (err)
1986                         return err;
1987         }
1988         for (i = 0; i < enic->rq_count; i++) {
1989                 err = vnic_rq_disable(&enic->rq[i]);
1990                 if (err)
1991                         return err;
1992         }
1993
1994         enic_dev_notify_unset(enic);
1995         enic_unset_affinity_hint(enic);
1996         enic_free_intr(enic);
1997
1998         for (i = 0; i < enic->wq_count; i++)
1999                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
2000         for (i = 0; i < enic->rq_count; i++)
2001                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
2002         for (i = 0; i < enic->cq_count; i++)
2003                 vnic_cq_clean(&enic->cq[i]);
2004         for (i = 0; i < enic->intr_count; i++)
2005                 vnic_intr_clean(&enic->intr[i]);
2006
2007         return 0;
2008 }
2009
2010 static int _enic_change_mtu(struct net_device *netdev, int new_mtu)
2011 {
2012         bool running = netif_running(netdev);
2013         int err = 0;
2014
2015         ASSERT_RTNL();
2016         if (running) {
2017                 err = enic_stop(netdev);
2018                 if (err)
2019                         return err;
2020         }
2021
2022         netdev->mtu = new_mtu;
2023
2024         if (running) {
2025                 err = enic_open(netdev);
2026                 if (err)
2027                         return err;
2028         }
2029
2030         return 0;
2031 }
2032
2033 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
2034 {
2035         struct enic *enic = netdev_priv(netdev);
2036
2037         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2038                 return -EOPNOTSUPP;
2039
2040         if (netdev->mtu > enic->port_mtu)
2041                 netdev_warn(netdev,
2042                             "interface MTU (%d) set higher than port MTU (%d)\n",
2043                             netdev->mtu, enic->port_mtu);
2044
2045         return _enic_change_mtu(netdev, new_mtu);
2046 }
2047
2048 static void enic_change_mtu_work(struct work_struct *work)
2049 {
2050         struct enic *enic = container_of(work, struct enic, change_mtu_work);
2051         struct net_device *netdev = enic->netdev;
2052         int new_mtu = vnic_dev_mtu(enic->vdev);
2053
2054         rtnl_lock();
2055         (void)_enic_change_mtu(netdev, new_mtu);
2056         rtnl_unlock();
2057
2058         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
2059 }
2060
2061 #ifdef CONFIG_NET_POLL_CONTROLLER
2062 static void enic_poll_controller(struct net_device *netdev)
2063 {
2064         struct enic *enic = netdev_priv(netdev);
2065         struct vnic_dev *vdev = enic->vdev;
2066         unsigned int i, intr;
2067
2068         switch (vnic_dev_get_intr_mode(vdev)) {
2069         case VNIC_DEV_INTR_MODE_MSIX:
2070                 for (i = 0; i < enic->rq_count; i++) {
2071                         intr = enic_msix_rq_intr(enic, i);
2072                         enic_isr_msix(enic->msix_entry[intr].vector,
2073                                       &enic->napi[i]);
2074                 }
2075
2076                 for (i = 0; i < enic->wq_count; i++) {
2077                         intr = enic_msix_wq_intr(enic, i);
2078                         enic_isr_msix(enic->msix_entry[intr].vector,
2079                                       &enic->napi[enic_cq_wq(enic, i)]);
2080                 }
2081
2082                 break;
2083         case VNIC_DEV_INTR_MODE_MSI:
2084                 enic_isr_msi(enic->pdev->irq, enic);
2085                 break;
2086         case VNIC_DEV_INTR_MODE_INTX:
2087                 enic_isr_legacy(enic->pdev->irq, netdev);
2088                 break;
2089         default:
2090                 break;
2091         }
2092 }
2093 #endif
2094
2095 static int enic_dev_wait(struct vnic_dev *vdev,
2096         int (*start)(struct vnic_dev *, int),
2097         int (*finished)(struct vnic_dev *, int *),
2098         int arg)
2099 {
2100         unsigned long time;
2101         int done;
2102         int err;
2103
2104         err = start(vdev, arg);
2105         if (err)
2106                 return err;
2107
2108         /* Wait for func to complete...2 seconds max
2109          */
2110
2111         time = jiffies + (HZ * 2);
2112         do {
2113
2114                 err = finished(vdev, &done);
2115                 if (err)
2116                         return err;
2117
2118                 if (done)
2119                         return 0;
2120
2121                 schedule_timeout_uninterruptible(HZ / 10);
2122
2123         } while (time_after(time, jiffies));
2124
2125         return -ETIMEDOUT;
2126 }
2127
2128 static int enic_dev_open(struct enic *enic)
2129 {
2130         int err;
2131
2132         err = enic_dev_wait(enic->vdev, vnic_dev_open,
2133                 vnic_dev_open_done, 0);
2134         if (err)
2135                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
2136                         err);
2137
2138         return err;
2139 }
2140
2141 static int enic_dev_soft_reset(struct enic *enic)
2142 {
2143         int err;
2144
2145         err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
2146                             vnic_dev_soft_reset_done, 0);
2147         if (err)
2148                 netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n",
2149                            err);
2150
2151         return err;
2152 }
2153
2154 static int enic_dev_hang_reset(struct enic *enic)
2155 {
2156         int err;
2157
2158         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
2159                 vnic_dev_hang_reset_done, 0);
2160         if (err)
2161                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
2162                         err);
2163
2164         return err;
2165 }
2166
2167 int __enic_set_rsskey(struct enic *enic)
2168 {
2169         union vnic_rss_key *rss_key_buf_va;
2170         dma_addr_t rss_key_buf_pa;
2171         int i, kidx, bidx, err;
2172
2173         rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
2174                                                sizeof(union vnic_rss_key),
2175                                                &rss_key_buf_pa);
2176         if (!rss_key_buf_va)
2177                 return -ENOMEM;
2178
2179         for (i = 0; i < ENIC_RSS_LEN; i++) {
2180                 kidx = i / ENIC_RSS_BYTES_PER_KEY;
2181                 bidx = i % ENIC_RSS_BYTES_PER_KEY;
2182                 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
2183         }
2184         spin_lock_bh(&enic->devcmd_lock);
2185         err = enic_set_rss_key(enic,
2186                 rss_key_buf_pa,
2187                 sizeof(union vnic_rss_key));
2188         spin_unlock_bh(&enic->devcmd_lock);
2189
2190         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
2191                 rss_key_buf_va, rss_key_buf_pa);
2192
2193         return err;
2194 }
2195
2196 static int enic_set_rsskey(struct enic *enic)
2197 {
2198         netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
2199
2200         return __enic_set_rsskey(enic);
2201 }
2202
2203 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
2204 {
2205         dma_addr_t rss_cpu_buf_pa;
2206         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
2207         unsigned int i;
2208         int err;
2209
2210         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
2211                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
2212         if (!rss_cpu_buf_va)
2213                 return -ENOMEM;
2214
2215         for (i = 0; i < (1 << rss_hash_bits); i++)
2216                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
2217
2218         spin_lock_bh(&enic->devcmd_lock);
2219         err = enic_set_rss_cpu(enic,
2220                 rss_cpu_buf_pa,
2221                 sizeof(union vnic_rss_cpu));
2222         spin_unlock_bh(&enic->devcmd_lock);
2223
2224         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
2225                 rss_cpu_buf_va, rss_cpu_buf_pa);
2226
2227         return err;
2228 }
2229
2230 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2231         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2232 {
2233         const u8 tso_ipid_split_en = 0;
2234         const u8 ig_vlan_strip_en = 1;
2235         int err;
2236
2237         /* Enable VLAN tag stripping.
2238         */
2239
2240         spin_lock_bh(&enic->devcmd_lock);
2241         err = enic_set_nic_cfg(enic,
2242                 rss_default_cpu, rss_hash_type,
2243                 rss_hash_bits, rss_base_cpu,
2244                 rss_enable, tso_ipid_split_en,
2245                 ig_vlan_strip_en);
2246         spin_unlock_bh(&enic->devcmd_lock);
2247
2248         return err;
2249 }
2250
2251 static int enic_set_rss_nic_cfg(struct enic *enic)
2252 {
2253         struct device *dev = enic_get_dev(enic);
2254         const u8 rss_default_cpu = 0;
2255         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
2256                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
2257                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
2258                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2259         const u8 rss_hash_bits = 7;
2260         const u8 rss_base_cpu = 0;
2261         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2262
2263         if (rss_enable) {
2264                 if (!enic_set_rsskey(enic)) {
2265                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
2266                                 rss_enable = 0;
2267                                 dev_warn(dev, "RSS disabled, "
2268                                         "Failed to set RSS cpu indirection table.");
2269                         }
2270                 } else {
2271                         rss_enable = 0;
2272                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2273                 }
2274         }
2275
2276         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2277                 rss_hash_bits, rss_base_cpu, rss_enable);
2278 }
2279
2280 static void enic_set_api_busy(struct enic *enic, bool busy)
2281 {
2282         spin_lock(&enic->enic_api_lock);
2283         enic->enic_api_busy = busy;
2284         spin_unlock(&enic->enic_api_lock);
2285 }
2286
2287 static void enic_reset(struct work_struct *work)
2288 {
2289         struct enic *enic = container_of(work, struct enic, reset);
2290
2291         if (!netif_running(enic->netdev))
2292                 return;
2293
2294         rtnl_lock();
2295
2296         /* Stop any activity from infiniband */
2297         enic_set_api_busy(enic, true);
2298
2299         enic_stop(enic->netdev);
2300         enic_dev_soft_reset(enic);
2301         enic_reset_addr_lists(enic);
2302         enic_init_vnic_resources(enic);
2303         enic_set_rss_nic_cfg(enic);
2304         enic_dev_set_ig_vlan_rewrite_mode(enic);
2305         enic_open(enic->netdev);
2306
2307         /* Allow infiniband to fiddle with the device again */
2308         enic_set_api_busy(enic, false);
2309
2310         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2311
2312         rtnl_unlock();
2313 }
2314
2315 static void enic_tx_hang_reset(struct work_struct *work)
2316 {
2317         struct enic *enic = container_of(work, struct enic, tx_hang_reset);
2318
2319         rtnl_lock();
2320
2321         /* Stop any activity from infiniband */
2322         enic_set_api_busy(enic, true);
2323
2324         enic_dev_hang_notify(enic);
2325         enic_stop(enic->netdev);
2326         enic_dev_hang_reset(enic);
2327         enic_reset_addr_lists(enic);
2328         enic_init_vnic_resources(enic);
2329         enic_set_rss_nic_cfg(enic);
2330         enic_dev_set_ig_vlan_rewrite_mode(enic);
2331         enic_open(enic->netdev);
2332
2333         /* Allow infiniband to fiddle with the device again */
2334         enic_set_api_busy(enic, false);
2335
2336         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2337
2338         rtnl_unlock();
2339 }
2340
2341 static int enic_set_intr_mode(struct enic *enic)
2342 {
2343         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2344         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2345         unsigned int i;
2346
2347         /* Set interrupt mode (INTx, MSI, MSI-X) depending
2348          * on system capabilities.
2349          *
2350          * Try MSI-X first
2351          *
2352          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2353          * (the second to last INTR is used for WQ/RQ errors)
2354          * (the last INTR is used for notifications)
2355          */
2356
2357         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2358         for (i = 0; i < n + m + 2; i++)
2359                 enic->msix_entry[i].entry = i;
2360
2361         /* Use multiple RQs if RSS is enabled
2362          */
2363
2364         if (ENIC_SETTING(enic, RSS) &&
2365             enic->config.intr_mode < 1 &&
2366             enic->rq_count >= n &&
2367             enic->wq_count >= m &&
2368             enic->cq_count >= n + m &&
2369             enic->intr_count >= n + m + 2) {
2370
2371                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2372                                           n + m + 2, n + m + 2) > 0) {
2373
2374                         enic->rq_count = n;
2375                         enic->wq_count = m;
2376                         enic->cq_count = n + m;
2377                         enic->intr_count = n + m + 2;
2378
2379                         vnic_dev_set_intr_mode(enic->vdev,
2380                                 VNIC_DEV_INTR_MODE_MSIX);
2381
2382                         return 0;
2383                 }
2384         }
2385
2386         if (enic->config.intr_mode < 1 &&
2387             enic->rq_count >= 1 &&
2388             enic->wq_count >= m &&
2389             enic->cq_count >= 1 + m &&
2390             enic->intr_count >= 1 + m + 2) {
2391                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2392                                           1 + m + 2, 1 + m + 2) > 0) {
2393
2394                         enic->rq_count = 1;
2395                         enic->wq_count = m;
2396                         enic->cq_count = 1 + m;
2397                         enic->intr_count = 1 + m + 2;
2398
2399                         vnic_dev_set_intr_mode(enic->vdev,
2400                                 VNIC_DEV_INTR_MODE_MSIX);
2401
2402                         return 0;
2403                 }
2404         }
2405
2406         /* Next try MSI
2407          *
2408          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2409          */
2410
2411         if (enic->config.intr_mode < 2 &&
2412             enic->rq_count >= 1 &&
2413             enic->wq_count >= 1 &&
2414             enic->cq_count >= 2 &&
2415             enic->intr_count >= 1 &&
2416             !pci_enable_msi(enic->pdev)) {
2417
2418                 enic->rq_count = 1;
2419                 enic->wq_count = 1;
2420                 enic->cq_count = 2;
2421                 enic->intr_count = 1;
2422
2423                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2424
2425                 return 0;
2426         }
2427
2428         /* Next try INTx
2429          *
2430          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2431          * (the first INTR is used for WQ/RQ)
2432          * (the second INTR is used for WQ/RQ errors)
2433          * (the last INTR is used for notifications)
2434          */
2435
2436         if (enic->config.intr_mode < 3 &&
2437             enic->rq_count >= 1 &&
2438             enic->wq_count >= 1 &&
2439             enic->cq_count >= 2 &&
2440             enic->intr_count >= 3) {
2441
2442                 enic->rq_count = 1;
2443                 enic->wq_count = 1;
2444                 enic->cq_count = 2;
2445                 enic->intr_count = 3;
2446
2447                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2448
2449                 return 0;
2450         }
2451
2452         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2453
2454         return -EINVAL;
2455 }
2456
2457 static void enic_clear_intr_mode(struct enic *enic)
2458 {
2459         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2460         case VNIC_DEV_INTR_MODE_MSIX:
2461                 pci_disable_msix(enic->pdev);
2462                 break;
2463         case VNIC_DEV_INTR_MODE_MSI:
2464                 pci_disable_msi(enic->pdev);
2465                 break;
2466         default:
2467                 break;
2468         }
2469
2470         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2471 }
2472
2473 static const struct net_device_ops enic_netdev_dynamic_ops = {
2474         .ndo_open               = enic_open,
2475         .ndo_stop               = enic_stop,
2476         .ndo_start_xmit         = enic_hard_start_xmit,
2477         .ndo_get_stats64        = enic_get_stats,
2478         .ndo_validate_addr      = eth_validate_addr,
2479         .ndo_set_rx_mode        = enic_set_rx_mode,
2480         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2481         .ndo_change_mtu         = enic_change_mtu,
2482         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2483         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2484         .ndo_tx_timeout         = enic_tx_timeout,
2485         .ndo_set_vf_port        = enic_set_vf_port,
2486         .ndo_get_vf_port        = enic_get_vf_port,
2487         .ndo_set_vf_mac         = enic_set_vf_mac,
2488 #ifdef CONFIG_NET_POLL_CONTROLLER
2489         .ndo_poll_controller    = enic_poll_controller,
2490 #endif
2491 #ifdef CONFIG_RFS_ACCEL
2492         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2493 #endif
2494         .ndo_udp_tunnel_add     = enic_udp_tunnel_add,
2495         .ndo_udp_tunnel_del     = enic_udp_tunnel_del,
2496         .ndo_features_check     = enic_features_check,
2497 };
2498
2499 static const struct net_device_ops enic_netdev_ops = {
2500         .ndo_open               = enic_open,
2501         .ndo_stop               = enic_stop,
2502         .ndo_start_xmit         = enic_hard_start_xmit,
2503         .ndo_get_stats64        = enic_get_stats,
2504         .ndo_validate_addr      = eth_validate_addr,
2505         .ndo_set_mac_address    = enic_set_mac_address,
2506         .ndo_set_rx_mode        = enic_set_rx_mode,
2507         .ndo_change_mtu         = enic_change_mtu,
2508         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2509         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2510         .ndo_tx_timeout         = enic_tx_timeout,
2511         .ndo_set_vf_port        = enic_set_vf_port,
2512         .ndo_get_vf_port        = enic_get_vf_port,
2513         .ndo_set_vf_mac         = enic_set_vf_mac,
2514 #ifdef CONFIG_NET_POLL_CONTROLLER
2515         .ndo_poll_controller    = enic_poll_controller,
2516 #endif
2517 #ifdef CONFIG_RFS_ACCEL
2518         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2519 #endif
2520         .ndo_udp_tunnel_add     = enic_udp_tunnel_add,
2521         .ndo_udp_tunnel_del     = enic_udp_tunnel_del,
2522         .ndo_features_check     = enic_features_check,
2523 };
2524
2525 static void enic_dev_deinit(struct enic *enic)
2526 {
2527         unsigned int i;
2528
2529         for (i = 0; i < enic->rq_count; i++) {
2530                 napi_hash_del(&enic->napi[i]);
2531                 netif_napi_del(&enic->napi[i]);
2532         }
2533         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2534                 for (i = 0; i < enic->wq_count; i++)
2535                         netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2536
2537         enic_free_vnic_resources(enic);
2538         enic_clear_intr_mode(enic);
2539         enic_free_affinity_hint(enic);
2540 }
2541
2542 static void enic_kdump_kernel_config(struct enic *enic)
2543 {
2544         if (is_kdump_kernel()) {
2545                 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2546                 enic->rq_count = 1;
2547                 enic->wq_count = 1;
2548                 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2549                 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2550                 enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2551         }
2552 }
2553
2554 static int enic_dev_init(struct enic *enic)
2555 {
2556         struct device *dev = enic_get_dev(enic);
2557         struct net_device *netdev = enic->netdev;
2558         unsigned int i;
2559         int err;
2560
2561         /* Get interrupt coalesce timer info */
2562         err = enic_dev_intr_coal_timer_info(enic);
2563         if (err) {
2564                 dev_warn(dev, "Using default conversion factor for "
2565                         "interrupt coalesce timer\n");
2566                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2567         }
2568
2569         /* Get vNIC configuration
2570          */
2571
2572         err = enic_get_vnic_config(enic);
2573         if (err) {
2574                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2575                 return err;
2576         }
2577
2578         /* Get available resource counts
2579          */
2580
2581         enic_get_res_counts(enic);
2582
2583         /* modify resource count if we are in kdump_kernel
2584          */
2585         enic_kdump_kernel_config(enic);
2586
2587         /* Set interrupt mode based on resource counts and system
2588          * capabilities
2589          */
2590
2591         err = enic_set_intr_mode(enic);
2592         if (err) {
2593                 dev_err(dev, "Failed to set intr mode based on resource "
2594                         "counts and system capabilities, aborting\n");
2595                 return err;
2596         }
2597
2598         /* Allocate and configure vNIC resources
2599          */
2600
2601         err = enic_alloc_vnic_resources(enic);
2602         if (err) {
2603                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2604                 goto err_out_free_vnic_resources;
2605         }
2606
2607         enic_init_vnic_resources(enic);
2608
2609         err = enic_set_rss_nic_cfg(enic);
2610         if (err) {
2611                 dev_err(dev, "Failed to config nic, aborting\n");
2612                 goto err_out_free_vnic_resources;
2613         }
2614
2615         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2616         default:
2617                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2618                 break;
2619         case VNIC_DEV_INTR_MODE_MSIX:
2620                 for (i = 0; i < enic->rq_count; i++) {
2621                         netif_napi_add(netdev, &enic->napi[i],
2622                                 enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2623                 }
2624                 for (i = 0; i < enic->wq_count; i++)
2625                         netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2626                                        enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2627                 break;
2628         }
2629
2630         return 0;
2631
2632 err_out_free_vnic_resources:
2633         enic_free_affinity_hint(enic);
2634         enic_clear_intr_mode(enic);
2635         enic_free_vnic_resources(enic);
2636
2637         return err;
2638 }
2639
2640 static void enic_iounmap(struct enic *enic)
2641 {
2642         unsigned int i;
2643
2644         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2645                 if (enic->bar[i].vaddr)
2646                         iounmap(enic->bar[i].vaddr);
2647 }
2648
2649 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2650 {
2651         struct device *dev = &pdev->dev;
2652         struct net_device *netdev;
2653         struct enic *enic;
2654         int using_dac = 0;
2655         unsigned int i;
2656         int err;
2657 #ifdef CONFIG_PCI_IOV
2658         int pos = 0;
2659 #endif
2660         int num_pps = 1;
2661
2662         /* Allocate net device structure and initialize.  Private
2663          * instance data is initialized to zero.
2664          */
2665
2666         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2667                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2668         if (!netdev)
2669                 return -ENOMEM;
2670
2671         pci_set_drvdata(pdev, netdev);
2672
2673         SET_NETDEV_DEV(netdev, &pdev->dev);
2674
2675         enic = netdev_priv(netdev);
2676         enic->netdev = netdev;
2677         enic->pdev = pdev;
2678
2679         /* Setup PCI resources
2680          */
2681
2682         err = pci_enable_device_mem(pdev);
2683         if (err) {
2684                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2685                 goto err_out_free_netdev;
2686         }
2687
2688         err = pci_request_regions(pdev, DRV_NAME);
2689         if (err) {
2690                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2691                 goto err_out_disable_device;
2692         }
2693
2694         pci_set_master(pdev);
2695
2696         /* Query PCI controller on system for DMA addressing
2697          * limitation for the device.  Try 47-bit first, and
2698          * fail to 32-bit.
2699          */
2700
2701         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(47));
2702         if (err) {
2703                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2704                 if (err) {
2705                         dev_err(dev, "No usable DMA configuration, aborting\n");
2706                         goto err_out_release_regions;
2707                 }
2708                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2709                 if (err) {
2710                         dev_err(dev, "Unable to obtain %u-bit DMA "
2711                                 "for consistent allocations, aborting\n", 32);
2712                         goto err_out_release_regions;
2713                 }
2714         } else {
2715                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(47));
2716                 if (err) {
2717                         dev_err(dev, "Unable to obtain %u-bit DMA "
2718                                 "for consistent allocations, aborting\n", 47);
2719                         goto err_out_release_regions;
2720                 }
2721                 using_dac = 1;
2722         }
2723
2724         /* Map vNIC resources from BAR0-5
2725          */
2726
2727         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2728                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2729                         continue;
2730                 enic->bar[i].len = pci_resource_len(pdev, i);
2731                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2732                 if (!enic->bar[i].vaddr) {
2733                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2734                         err = -ENODEV;
2735                         goto err_out_iounmap;
2736                 }
2737                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2738         }
2739
2740         /* Register vNIC device
2741          */
2742
2743         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2744                 ARRAY_SIZE(enic->bar));
2745         if (!enic->vdev) {
2746                 dev_err(dev, "vNIC registration failed, aborting\n");
2747                 err = -ENODEV;
2748                 goto err_out_iounmap;
2749         }
2750
2751         err = vnic_devcmd_init(enic->vdev);
2752
2753         if (err)
2754                 goto err_out_vnic_unregister;
2755
2756 #ifdef CONFIG_PCI_IOV
2757         /* Get number of subvnics */
2758         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2759         if (pos) {
2760                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2761                         &enic->num_vfs);
2762                 if (enic->num_vfs) {
2763                         err = pci_enable_sriov(pdev, enic->num_vfs);
2764                         if (err) {
2765                                 dev_err(dev, "SRIOV enable failed, aborting."
2766                                         " pci_enable_sriov() returned %d\n",
2767                                         err);
2768                                 goto err_out_vnic_unregister;
2769                         }
2770                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2771                         num_pps = enic->num_vfs;
2772                 }
2773         }
2774 #endif
2775
2776         /* Allocate structure for port profiles */
2777         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2778         if (!enic->pp) {
2779                 err = -ENOMEM;
2780                 goto err_out_disable_sriov_pp;
2781         }
2782
2783         /* Issue device open to get device in known state
2784          */
2785
2786         err = enic_dev_open(enic);
2787         if (err) {
2788                 dev_err(dev, "vNIC dev open failed, aborting\n");
2789                 goto err_out_disable_sriov;
2790         }
2791
2792         /* Setup devcmd lock
2793          */
2794
2795         spin_lock_init(&enic->devcmd_lock);
2796         spin_lock_init(&enic->enic_api_lock);
2797
2798         /*
2799          * Set ingress vlan rewrite mode before vnic initialization
2800          */
2801
2802         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2803         if (err) {
2804                 dev_err(dev,
2805                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2806                 goto err_out_dev_close;
2807         }
2808
2809         /* Issue device init to initialize the vnic-to-switch link.
2810          * We'll start with carrier off and wait for link UP
2811          * notification later to turn on carrier.  We don't need
2812          * to wait here for the vnic-to-switch link initialization
2813          * to complete; link UP notification is the indication that
2814          * the process is complete.
2815          */
2816
2817         netif_carrier_off(netdev);
2818
2819         /* Do not call dev_init for a dynamic vnic.
2820          * For a dynamic vnic, init_prov_info will be
2821          * called later by an upper layer.
2822          */
2823
2824         if (!enic_is_dynamic(enic)) {
2825                 err = vnic_dev_init(enic->vdev, 0);
2826                 if (err) {
2827                         dev_err(dev, "vNIC dev init failed, aborting\n");
2828                         goto err_out_dev_close;
2829                 }
2830         }
2831
2832         err = enic_dev_init(enic);
2833         if (err) {
2834                 dev_err(dev, "Device initialization failed, aborting\n");
2835                 goto err_out_dev_close;
2836         }
2837
2838         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2839         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2840
2841         /* Setup notification timer, HW reset task, and wq locks
2842          */
2843
2844         init_timer(&enic->notify_timer);
2845         enic->notify_timer.function = enic_notify_timer;
2846         enic->notify_timer.data = (unsigned long)enic;
2847
2848         enic_rfs_flw_tbl_init(enic);
2849         enic_set_rx_coal_setting(enic);
2850         INIT_WORK(&enic->reset, enic_reset);
2851         INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset);
2852         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2853
2854         for (i = 0; i < enic->wq_count; i++)
2855                 spin_lock_init(&enic->wq_lock[i]);
2856
2857         /* Register net device
2858          */
2859
2860         enic->port_mtu = enic->config.mtu;
2861
2862         err = enic_set_mac_addr(netdev, enic->mac_addr);
2863         if (err) {
2864                 dev_err(dev, "Invalid MAC address, aborting\n");
2865                 goto err_out_dev_deinit;
2866         }
2867
2868         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2869         /* rx coalesce time already got initialized. This gets used
2870          * if adaptive coal is turned off
2871          */
2872         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2873
2874         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2875                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2876         else
2877                 netdev->netdev_ops = &enic_netdev_ops;
2878
2879         netdev->watchdog_timeo = 2 * HZ;
2880         enic_set_ethtool_ops(netdev);
2881
2882         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2883         if (ENIC_SETTING(enic, LOOP)) {
2884                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2885                 enic->loop_enable = 1;
2886                 enic->loop_tag = enic->config.loop_tag;
2887                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2888         }
2889         if (ENIC_SETTING(enic, TXCSUM))
2890                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2891         if (ENIC_SETTING(enic, TSO))
2892                 netdev->hw_features |= NETIF_F_TSO |
2893                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2894         if (ENIC_SETTING(enic, RSS))
2895                 netdev->hw_features |= NETIF_F_RXHASH;
2896         if (ENIC_SETTING(enic, RXCSUM))
2897                 netdev->hw_features |= NETIF_F_RXCSUM;
2898         if (ENIC_SETTING(enic, VXLAN)) {
2899                 u64 patch_level;
2900
2901                 netdev->hw_enc_features |= NETIF_F_RXCSUM               |
2902                                            NETIF_F_TSO                  |
2903                                            NETIF_F_TSO_ECN              |
2904                                            NETIF_F_GSO_UDP_TUNNEL       |
2905                                            NETIF_F_HW_CSUM              |
2906                                            NETIF_F_GSO_UDP_TUNNEL_CSUM;
2907                 netdev->hw_features |= netdev->hw_enc_features;
2908                 /* get bit mask from hw about supported offload bit level
2909                  * BIT(0) = fw supports patch_level 0
2910                  *          fcoe bit = encap
2911                  *          fcoe_fc_crc_ok = outer csum ok
2912                  * BIT(1) = always set by fw
2913                  * BIT(2) = fw supports patch_level 2
2914                  *          BIT(0) in rss_hash = encap
2915                  *          BIT(1,2) in rss_hash = outer_ip_csum_ok/
2916                  *                                 outer_tcp_csum_ok
2917                  * used in enic_rq_indicate_buf
2918                  */
2919                 err = vnic_dev_get_supported_feature_ver(enic->vdev,
2920                                                          VIC_FEATURE_VXLAN,
2921                                                          &patch_level);
2922                 if (err)
2923                         patch_level = 0;
2924                 /* mask bits that are supported by driver
2925                  */
2926                 patch_level &= BIT_ULL(0) | BIT_ULL(2);
2927                 patch_level = fls(patch_level);
2928                 patch_level = patch_level ? patch_level - 1 : 0;
2929                 enic->vxlan.patch_level = patch_level;
2930         }
2931
2932         netdev->features |= netdev->hw_features;
2933         netdev->vlan_features |= netdev->features;
2934
2935 #ifdef CONFIG_RFS_ACCEL
2936         netdev->hw_features |= NETIF_F_NTUPLE;
2937 #endif
2938
2939         if (using_dac)
2940                 netdev->features |= NETIF_F_HIGHDMA;
2941
2942         netdev->priv_flags |= IFF_UNICAST_FLT;
2943
2944         /* MTU range: 68 - 9000 */
2945         netdev->min_mtu = ENIC_MIN_MTU;
2946         netdev->max_mtu = ENIC_MAX_MTU;
2947         netdev->mtu     = enic->port_mtu;
2948
2949         err = register_netdev(netdev);
2950         if (err) {
2951                 dev_err(dev, "Cannot register net device, aborting\n");
2952                 goto err_out_dev_deinit;
2953         }
2954         enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2955
2956         return 0;
2957
2958 err_out_dev_deinit:
2959         enic_dev_deinit(enic);
2960 err_out_dev_close:
2961         vnic_dev_close(enic->vdev);
2962 err_out_disable_sriov:
2963         kfree(enic->pp);
2964 err_out_disable_sriov_pp:
2965 #ifdef CONFIG_PCI_IOV
2966         if (enic_sriov_enabled(enic)) {
2967                 pci_disable_sriov(pdev);
2968                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2969         }
2970 #endif
2971 err_out_vnic_unregister:
2972         vnic_dev_unregister(enic->vdev);
2973 err_out_iounmap:
2974         enic_iounmap(enic);
2975 err_out_release_regions:
2976         pci_release_regions(pdev);
2977 err_out_disable_device:
2978         pci_disable_device(pdev);
2979 err_out_free_netdev:
2980         free_netdev(netdev);
2981
2982         return err;
2983 }
2984
2985 static void enic_remove(struct pci_dev *pdev)
2986 {
2987         struct net_device *netdev = pci_get_drvdata(pdev);
2988
2989         if (netdev) {
2990                 struct enic *enic = netdev_priv(netdev);
2991
2992                 cancel_work_sync(&enic->reset);
2993                 cancel_work_sync(&enic->change_mtu_work);
2994                 unregister_netdev(netdev);
2995                 enic_dev_deinit(enic);
2996                 vnic_dev_close(enic->vdev);
2997 #ifdef CONFIG_PCI_IOV
2998                 if (enic_sriov_enabled(enic)) {
2999                         pci_disable_sriov(pdev);
3000                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
3001                 }
3002 #endif
3003                 kfree(enic->pp);
3004                 vnic_dev_unregister(enic->vdev);
3005                 enic_iounmap(enic);
3006                 pci_release_regions(pdev);
3007                 pci_disable_device(pdev);
3008                 free_netdev(netdev);
3009         }
3010 }
3011
3012 static struct pci_driver enic_driver = {
3013         .name = DRV_NAME,
3014         .id_table = enic_id_table,
3015         .probe = enic_probe,
3016         .remove = enic_remove,
3017 };
3018
3019 static int __init enic_init_module(void)
3020 {
3021         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
3022
3023         return pci_register_driver(&enic_driver);
3024 }
3025
3026 static void __exit enic_cleanup_module(void)
3027 {
3028         pci_unregister_driver(&enic_driver);
3029 }
3030
3031 module_init(enic_init_module);
3032 module_exit(enic_cleanup_module);