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

   1 /*
   2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  *
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/workqueue.h>
  28 #include <linux/pci.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if.h>
  32 #include <linux/if_ether.h>
  33 #include <linux/if_vlan.h>
  34 #include <linux/in.h>
  35 #include <linux/ip.h>
  36 #include <linux/ipv6.h>
  37 #include <linux/tcp.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/prefetch.h>
  40 #include <net/ip6_checksum.h>
  41 #include <linux/ktime.h>
  42 #ifdef CONFIG_RFS_ACCEL
  43 #include <linux/cpu_rmap.h>
  44 #endif
  45 #ifdef CONFIG_NET_RX_BUSY_POLL
  46 #include <net/busy_poll.h>
  47 #endif
  48 #include <linux/crash_dump.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 int enic_is_dynamic(struct enic *enic)
 116 {
 117         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 118 }
 119
 120 int enic_sriov_enabled(struct enic *enic)
 121 {
 122         return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 123 }
 124
 125 static int enic_is_sriov_vf(struct enic *enic)
 126 {
 127         return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 128 }
 129
 130 int enic_is_valid_vf(struct enic *enic, int vf)
 131 {
 132 #ifdef CONFIG_PCI_IOV
 133         return vf >= 0 && vf < enic->num_vfs;
 134 #else
 135         return 0;
 136 #endif
 137 }
 138
 139 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 140 {
 141         struct enic *enic = vnic_dev_priv(wq->vdev);
 142
 143         if (buf->sop)
 144                 pci_unmap_single(enic->pdev, buf->dma_addr,
 145                         buf->len, PCI_DMA_TODEVICE);
 146         else
 147                 pci_unmap_page(enic->pdev, buf->dma_addr,
 148                         buf->len, PCI_DMA_TODEVICE);
 149
 150         if (buf->os_buf)
 151                 dev_kfree_skb_any(buf->os_buf);
 152 }
 153
 154 static void enic_wq_free_buf(struct vnic_wq *wq,
 155         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 156 {
 157         enic_free_wq_buf(wq, buf);
 158 }
 159
 160 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 161         u8 type, u16 q_number, u16 completed_index, void *opaque)
 162 {
 163         struct enic *enic = vnic_dev_priv(vdev);
 164
 165         spin_lock(&enic->wq_lock[q_number]);
 166
 167         vnic_wq_service(&enic->wq[q_number], cq_desc,
 168                 completed_index, enic_wq_free_buf,
 169                 opaque);
 170
 171         if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 172             vnic_wq_desc_avail(&enic->wq[q_number]) >=
 173             (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 174                 netif_wake_subqueue(enic->netdev, q_number);
 175
 176         spin_unlock(&enic->wq_lock[q_number]);
 177
 178         return 0;
 179 }
 180
 181 static void enic_log_q_error(struct enic *enic)
 182 {
 183         unsigned int i;
 184         u32 error_status;
 185
 186         for (i = 0; i < enic->wq_count; i++) {
 187                 error_status = vnic_wq_error_status(&enic->wq[i]);
 188                 if (error_status)
 189                         netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 190                                 i, error_status);
 191         }
 192
 193         for (i = 0; i < enic->rq_count; i++) {
 194                 error_status = vnic_rq_error_status(&enic->rq[i]);
 195                 if (error_status)
 196                         netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 197                                 i, error_status);
 198         }
 199 }
 200
 201 static void enic_msglvl_check(struct enic *enic)
 202 {
 203         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 204
 205         if (msg_enable != enic->msg_enable) {
 206                 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 207                         enic->msg_enable, msg_enable);
 208                 enic->msg_enable = msg_enable;
 209         }
 210 }
 211
 212 static void enic_mtu_check(struct enic *enic)
 213 {
 214         u32 mtu = vnic_dev_mtu(enic->vdev);
 215         struct net_device *netdev = enic->netdev;
 216
 217         if (mtu && mtu != enic->port_mtu) {
 218                 enic->port_mtu = mtu;
 219                 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 220                         mtu = max_t(int, ENIC_MIN_MTU,
 221                                 min_t(int, ENIC_MAX_MTU, mtu));
 222                         if (mtu != netdev->mtu)
 223                                 schedule_work(&enic->change_mtu_work);
 224                 } else {
 225                         if (mtu < netdev->mtu)
 226                                 netdev_warn(netdev,
 227                                         "interface MTU (%d) set higher "
 228                                         "than switch port MTU (%d)\n",
 229                                         netdev->mtu, mtu);
 230                 }
 231         }
 232 }
 233
 234 static void enic_link_check(struct enic *enic)
 235 {
 236         int link_status = vnic_dev_link_status(enic->vdev);
 237         int carrier_ok = netif_carrier_ok(enic->netdev);
 238
 239         if (link_status && !carrier_ok) {
 240                 netdev_info(enic->netdev, "Link UP\n");
 241                 netif_carrier_on(enic->netdev);
 242         } else if (!link_status && carrier_ok) {
 243                 netdev_info(enic->netdev, "Link DOWN\n");
 244                 netif_carrier_off(enic->netdev);
 245         }
 246 }
 247
 248 static void enic_notify_check(struct enic *enic)
 249 {
 250         enic_msglvl_check(enic);
 251         enic_mtu_check(enic);
 252         enic_link_check(enic);
 253 }
 254
 255 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 256
 257 static irqreturn_t enic_isr_legacy(int irq, void *data)
 258 {
 259         struct net_device *netdev = data;
 260         struct enic *enic = netdev_priv(netdev);
 261         unsigned int io_intr = enic_legacy_io_intr();
 262         unsigned int err_intr = enic_legacy_err_intr();
 263         unsigned int notify_intr = enic_legacy_notify_intr();
 264         u32 pba;
 265
 266         vnic_intr_mask(&enic->intr[io_intr]);
 267
 268         pba = vnic_intr_legacy_pba(enic->legacy_pba);
 269         if (!pba) {
 270                 vnic_intr_unmask(&enic->intr[io_intr]);
 271                 return IRQ_NONE;        /* not our interrupt */
 272         }
 273
 274         if (ENIC_TEST_INTR(pba, notify_intr)) {
 275                 enic_notify_check(enic);
 276                 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 277         }
 278
 279         if (ENIC_TEST_INTR(pba, err_intr)) {
 280                 vnic_intr_return_all_credits(&enic->intr[err_intr]);
 281                 enic_log_q_error(enic);
 282                 /* schedule recovery from WQ/RQ error */
 283                 schedule_work(&enic->reset);
 284                 return IRQ_HANDLED;
 285         }
 286
 287         if (ENIC_TEST_INTR(pba, io_intr))
 288                 napi_schedule_irqoff(&enic->napi[0]);
 289         else
 290                 vnic_intr_unmask(&enic->intr[io_intr]);
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static irqreturn_t enic_isr_msi(int irq, void *data)
 296 {
 297         struct enic *enic = data;
 298
 299         /* With MSI, there is no sharing of interrupts, so this is
 300          * our interrupt and there is no need to ack it.  The device
 301          * is not providing per-vector masking, so the OS will not
 302          * write to PCI config space to mask/unmask the interrupt.
 303          * We're using mask_on_assertion for MSI, so the device
 304          * automatically masks the interrupt when the interrupt is
 305          * generated.  Later, when exiting polling, the interrupt
 306          * will be unmasked (see enic_poll).
 307          *
 308          * Also, the device uses the same PCIe Traffic Class (TC)
 309          * for Memory Write data and MSI, so there are no ordering
 310          * issues; the MSI will always arrive at the Root Complex
 311          * _after_ corresponding Memory Writes (i.e. descriptor
 312          * writes).
 313          */
 314
 315         napi_schedule_irqoff(&enic->napi[0]);
 316
 317         return IRQ_HANDLED;
 318 }
 319
 320 static irqreturn_t enic_isr_msix(int irq, void *data)
 321 {
 322         struct napi_struct *napi = data;
 323
 324         napi_schedule_irqoff(napi);
 325
 326         return IRQ_HANDLED;
 327 }
 328
 329 static irqreturn_t enic_isr_msix_err(int irq, void *data)
 330 {
 331         struct enic *enic = data;
 332         unsigned int intr = enic_msix_err_intr(enic);
 333
 334         vnic_intr_return_all_credits(&enic->intr[intr]);
 335
 336         enic_log_q_error(enic);
 337
 338         /* schedule recovery from WQ/RQ error */
 339         schedule_work(&enic->reset);
 340
 341         return IRQ_HANDLED;
 342 }
 343
 344 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 345 {
 346         struct enic *enic = data;
 347         unsigned int intr = enic_msix_notify_intr(enic);
 348
 349         enic_notify_check(enic);
 350         vnic_intr_return_all_credits(&enic->intr[intr]);
 351
 352         return IRQ_HANDLED;
 353 }
 354
 355 static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
 356                                   struct sk_buff *skb, unsigned int len_left,
 357                                   int loopback)
 358 {
 359         const skb_frag_t *frag;
 360         dma_addr_t dma_addr;
 361
 362         /* Queue additional data fragments */
 363         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 364                 len_left -= skb_frag_size(frag);
 365                 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
 366                                             skb_frag_size(frag),
 367                                             DMA_TO_DEVICE);
 368                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 369                         return -ENOMEM;
 370                 enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
 371                                         (len_left == 0),        /* EOP? */
 372                                         loopback);
 373         }
 374
 375         return 0;
 376 }
 377
 378 static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
 379                                   struct sk_buff *skb, int vlan_tag_insert,
 380                                   unsigned int vlan_tag, int loopback)
 381 {
 382         unsigned int head_len = skb_headlen(skb);
 383         unsigned int len_left = skb->len - head_len;
 384         int eop = (len_left == 0);
 385         dma_addr_t dma_addr;
 386         int err = 0;
 387
 388         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 389                                   PCI_DMA_TODEVICE);
 390         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 391                 return -ENOMEM;
 392
 393         /* Queue the main skb fragment. The fragments are no larger
 394          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 395          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 396          * per fragment is queued.
 397          */
 398         enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert,
 399                            vlan_tag, eop, loopback);
 400
 401         if (!eop)
 402                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 403
 404         return err;
 405 }
 406
 407 static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
 408                                      struct sk_buff *skb, int vlan_tag_insert,
 409                                      unsigned int vlan_tag, int loopback)
 410 {
 411         unsigned int head_len = skb_headlen(skb);
 412         unsigned int len_left = skb->len - head_len;
 413         unsigned int hdr_len = skb_checksum_start_offset(skb);
 414         unsigned int csum_offset = hdr_len + skb->csum_offset;
 415         int eop = (len_left == 0);
 416         dma_addr_t dma_addr;
 417         int err = 0;
 418
 419         dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 420                                   PCI_DMA_TODEVICE);
 421         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 422                 return -ENOMEM;
 423
 424         /* Queue the main skb fragment. The fragments are no larger
 425          * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 426          * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 427          * per fragment is queued.
 428          */
 429         enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset,
 430                                    hdr_len, vlan_tag_insert, vlan_tag, eop,
 431                                    loopback);
 432
 433         if (!eop)
 434                 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 435
 436         return err;
 437 }
 438
 439 static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
 440                                  struct sk_buff *skb, unsigned int mss,
 441                                  int vlan_tag_insert, unsigned int vlan_tag,
 442                                  int loopback)
 443 {
 444         unsigned int frag_len_left = skb_headlen(skb);
 445         unsigned int len_left = skb->len - frag_len_left;
 446         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 447         int eop = (len_left == 0);
 448         unsigned int len;
 449         dma_addr_t dma_addr;
 450         unsigned int offset = 0;
 451         skb_frag_t *frag;
 452
 453         /* Preload TCP csum field with IP pseudo hdr calculated
 454          * with IP length set to zero.  HW will later add in length
 455          * to each TCP segment resulting from the TSO.
 456          */
 457
 458         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 459                 ip_hdr(skb)->check = 0;
 460                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 461                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 462         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 463                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 464                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 465         }
 466
 467         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 468          * for the main skb fragment
 469          */
 470         while (frag_len_left) {
 471                 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 472                 dma_addr = pci_map_single(enic->pdev, skb->data + offset, len,
 473                                           PCI_DMA_TODEVICE);
 474                 if (unlikely(enic_dma_map_check(enic, dma_addr)))
 475                         return -ENOMEM;
 476                 enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
 477                                        vlan_tag_insert, vlan_tag,
 478                                        eop && (len == frag_len_left), loopback);
 479                 frag_len_left -= len;
 480                 offset += len;
 481         }
 482
 483         if (eop)
 484                 return 0;
 485
 486         /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 487          * for additional data fragments
 488          */
 489         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 490                 len_left -= skb_frag_size(frag);
 491                 frag_len_left = skb_frag_size(frag);
 492                 offset = 0;
 493
 494                 while (frag_len_left) {
 495                         len = min(frag_len_left,
 496                                 (unsigned int)WQ_ENET_MAX_DESC_LEN);
 497                         dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 498                                                     offset, len,
 499                                                     DMA_TO_DEVICE);
 500                         if (unlikely(enic_dma_map_check(enic, dma_addr)))
 501                                 return -ENOMEM;
 502                         enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
 503                                                 (len_left == 0) &&
 504                                                  (len == frag_len_left),/*EOP*/
 505                                                 loopback);
 506                         frag_len_left -= len;
 507                         offset += len;
 508                 }
 509         }
 510
 511         return 0;
 512 }
 513
 514 static inline void enic_queue_wq_skb(struct enic *enic,
 515         struct vnic_wq *wq, struct sk_buff *skb)
 516 {
 517         unsigned int mss = skb_shinfo(skb)->gso_size;
 518         unsigned int vlan_tag = 0;
 519         int vlan_tag_insert = 0;
 520         int loopback = 0;
 521         int err;
 522
 523         if (skb_vlan_tag_present(skb)) {
 524                 /* VLAN tag from trunking driver */
 525                 vlan_tag_insert = 1;
 526                 vlan_tag = skb_vlan_tag_get(skb);
 527         } else if (enic->loop_enable) {
 528                 vlan_tag = enic->loop_tag;
 529                 loopback = 1;
 530         }
 531
 532         if (mss)
 533                 err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
 534                                             vlan_tag_insert, vlan_tag,
 535                                             loopback);
 536         else if (skb->ip_summed == CHECKSUM_PARTIAL)
 537                 err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
 538                                                 vlan_tag, loopback);
 539         else
 540                 err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
 541                                              vlan_tag, loopback);
 542         if (unlikely(err)) {
 543                 struct vnic_wq_buf *buf;
 544
 545                 buf = wq->to_use->prev;
 546                 /* while not EOP of previous pkt && queue not empty.
 547                  * For all non EOP bufs, os_buf is NULL.
 548                  */
 549                 while (!buf->os_buf && (buf->next != wq->to_clean)) {
 550                         enic_free_wq_buf(wq, buf);
 551                         wq->ring.desc_avail++;
 552                         buf = buf->prev;
 553                 }
 554                 wq->to_use = buf->next;
 555                 dev_kfree_skb(skb);
 556         }
 557 }
 558
 559 /* netif_tx_lock held, process context with BHs disabled, or BH */
 560 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 561         struct net_device *netdev)
 562 {
 563         struct enic *enic = netdev_priv(netdev);
 564         struct vnic_wq *wq;
 565         unsigned int txq_map;
 566         struct netdev_queue *txq;
 567
 568         if (skb->len <= 0) {
 569                 dev_kfree_skb_any(skb);
 570                 return NETDEV_TX_OK;
 571         }
 572
 573         txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 574         wq = &enic->wq[txq_map];
 575         txq = netdev_get_tx_queue(netdev, txq_map);
 576
 577         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 578          * which is very likely.  In the off chance it's going to take
 579          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 580          */
 581
 582         if (skb_shinfo(skb)->gso_size == 0 &&
 583             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 584             skb_linearize(skb)) {
 585                 dev_kfree_skb_any(skb);
 586                 return NETDEV_TX_OK;
 587         }
 588
 589         spin_lock(&enic->wq_lock[txq_map]);
 590
 591         if (vnic_wq_desc_avail(wq) <
 592             skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 593                 netif_tx_stop_queue(txq);
 594                 /* This is a hard error, log it */
 595                 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 596                 spin_unlock(&enic->wq_lock[txq_map]);
 597                 return NETDEV_TX_BUSY;
 598         }
 599
 600         enic_queue_wq_skb(enic, wq, skb);
 601
 602         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 603                 netif_tx_stop_queue(txq);
 604         if (!skb->xmit_more || netif_xmit_stopped(txq))
 605                 vnic_wq_doorbell(wq);
 606
 607         spin_unlock(&enic->wq_lock[txq_map]);
 608
 609         return NETDEV_TX_OK;
 610 }
 611
 612 /* dev_base_lock rwlock held, nominally process context */
 613 static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
 614                                                 struct rtnl_link_stats64 *net_stats)
 615 {
 616         struct enic *enic = netdev_priv(netdev);
 617         struct vnic_stats *stats;
 618         int err;
 619
 620         err = enic_dev_stats_dump(enic, &stats);
 621         /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump
 622          * For other failures, like devcmd failure, we return previously
 623          * recorded stats.
 624          */
 625         if (err == -ENOMEM)
 626                 return net_stats;
 627
 628         net_stats->tx_packets = stats->tx.tx_frames_ok;
 629         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 630         net_stats->tx_errors = stats->tx.tx_errors;
 631         net_stats->tx_dropped = stats->tx.tx_drops;
 632
 633         net_stats->rx_packets = stats->rx.rx_frames_ok;
 634         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 635         net_stats->rx_errors = stats->rx.rx_errors;
 636         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 637         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 638         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 639         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 640
 641         return net_stats;
 642 }
 643
 644 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 645 {
 646         struct enic *enic = netdev_priv(netdev);
 647
 648         if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 649                 unsigned int mc_count = netdev_mc_count(netdev);
 650
 651                 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 652                             ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 653
 654                 return -ENOSPC;
 655         }
 656
 657         enic_dev_add_addr(enic, mc_addr);
 658         enic->mc_count++;
 659
 660         return 0;
 661 }
 662
 663 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 664 {
 665         struct enic *enic = netdev_priv(netdev);
 666
 667         enic_dev_del_addr(enic, mc_addr);
 668         enic->mc_count--;
 669
 670         return 0;
 671 }
 672
 673 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 674 {
 675         struct enic *enic = netdev_priv(netdev);
 676
 677         if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 678                 unsigned int uc_count = netdev_uc_count(netdev);
 679
 680                 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 681                             ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 682
 683                 return -ENOSPC;
 684         }
 685
 686         enic_dev_add_addr(enic, uc_addr);
 687         enic->uc_count++;
 688
 689         return 0;
 690 }
 691
 692 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 693 {
 694         struct enic *enic = netdev_priv(netdev);
 695
 696         enic_dev_del_addr(enic, uc_addr);
 697         enic->uc_count--;
 698
 699         return 0;
 700 }
 701
 702 void enic_reset_addr_lists(struct enic *enic)
 703 {
 704         struct net_device *netdev = enic->netdev;
 705
 706         __dev_uc_unsync(netdev, NULL);
 707         __dev_mc_unsync(netdev, NULL);
 708
 709         enic->mc_count = 0;
 710         enic->uc_count = 0;
 711         enic->flags = 0;
 712 }
 713
 714 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 715 {
 716         struct enic *enic = netdev_priv(netdev);
 717
 718         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 719                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 720                         return -EADDRNOTAVAIL;
 721         } else {
 722                 if (!is_valid_ether_addr(addr))
 723                         return -EADDRNOTAVAIL;
 724         }
 725
 726         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 727
 728         return 0;
 729 }
 730
 731 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 732 {
 733         struct enic *enic = netdev_priv(netdev);
 734         struct sockaddr *saddr = p;
 735         char *addr = saddr->sa_data;
 736         int err;
 737
 738         if (netif_running(enic->netdev)) {
 739                 err = enic_dev_del_station_addr(enic);
 740                 if (err)
 741                         return err;
 742         }
 743
 744         err = enic_set_mac_addr(netdev, addr);
 745         if (err)
 746                 return err;
 747
 748         if (netif_running(enic->netdev)) {
 749                 err = enic_dev_add_station_addr(enic);
 750                 if (err)
 751                         return err;
 752         }
 753
 754         return err;
 755 }
 756
 757 static int enic_set_mac_address(struct net_device *netdev, void *p)
 758 {
 759         struct sockaddr *saddr = p;
 760         char *addr = saddr->sa_data;
 761         struct enic *enic = netdev_priv(netdev);
 762         int err;
 763
 764         err = enic_dev_del_station_addr(enic);
 765         if (err)
 766                 return err;
 767
 768         err = enic_set_mac_addr(netdev, addr);
 769         if (err)
 770                 return err;
 771
 772         return enic_dev_add_station_addr(enic);
 773 }
 774
 775 /* netif_tx_lock held, BHs disabled */
 776 static void enic_set_rx_mode(struct net_device *netdev)
 777 {
 778         struct enic *enic = netdev_priv(netdev);
 779         int directed = 1;
 780         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 781         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 782         int promisc = (netdev->flags & IFF_PROMISC) ||
 783                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
 784         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 785                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
 786         unsigned int flags = netdev->flags |
 787                 (allmulti ? IFF_ALLMULTI : 0) |
 788                 (promisc ? IFF_PROMISC : 0);
 789
 790         if (enic->flags != flags) {
 791                 enic->flags = flags;
 792                 enic_dev_packet_filter(enic, directed,
 793                         multicast, broadcast, promisc, allmulti);
 794         }
 795
 796         if (!promisc) {
 797                 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
 798                 if (!allmulti)
 799                         __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
 800         }
 801 }
 802
 803 /* netif_tx_lock held, BHs disabled */
 804 static void enic_tx_timeout(struct net_device *netdev)
 805 {
 806         struct enic *enic = netdev_priv(netdev);
 807         schedule_work(&enic->reset);
 808 }
 809
 810 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 811 {
 812         struct enic *enic = netdev_priv(netdev);
 813         struct enic_port_profile *pp;
 814         int err;
 815
 816         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 817         if (err)
 818                 return err;
 819
 820         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 821                 if (vf == PORT_SELF_VF) {
 822                         memcpy(pp->vf_mac, mac, ETH_ALEN);
 823                         return 0;
 824                 } else {
 825                         /*
 826                          * For sriov vf's set the mac in hw
 827                          */
 828                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 829                                 vnic_dev_set_mac_addr, mac);
 830                         return enic_dev_status_to_errno(err);
 831                 }
 832         } else
 833                 return -EINVAL;
 834 }
 835
 836 static int enic_set_vf_port(struct net_device *netdev, int vf,
 837         struct nlattr *port[])
 838 {
 839         struct enic *enic = netdev_priv(netdev);
 840         struct enic_port_profile prev_pp;
 841         struct enic_port_profile *pp;
 842         int err = 0, restore_pp = 1;
 843
 844         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 845         if (err)
 846                 return err;
 847
 848         if (!port[IFLA_PORT_REQUEST])
 849                 return -EOPNOTSUPP;
 850
 851         memcpy(&prev_pp, pp, sizeof(*enic->pp));
 852         memset(pp, 0, sizeof(*enic->pp));
 853
 854         pp->set |= ENIC_SET_REQUEST;
 855         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
 856
 857         if (port[IFLA_PORT_PROFILE]) {
 858                 pp->set |= ENIC_SET_NAME;
 859                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
 860                         PORT_PROFILE_MAX);
 861         }
 862
 863         if (port[IFLA_PORT_INSTANCE_UUID]) {
 864                 pp->set |= ENIC_SET_INSTANCE;
 865                 memcpy(pp->instance_uuid,
 866                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
 867         }
 868
 869         if (port[IFLA_PORT_HOST_UUID]) {
 870                 pp->set |= ENIC_SET_HOST;
 871                 memcpy(pp->host_uuid,
 872                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
 873         }
 874
 875         if (vf == PORT_SELF_VF) {
 876                 /* Special case handling: mac came from IFLA_VF_MAC */
 877                 if (!is_zero_ether_addr(prev_pp.vf_mac))
 878                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
 879
 880                 if (is_zero_ether_addr(netdev->dev_addr))
 881                         eth_hw_addr_random(netdev);
 882         } else {
 883                 /* SR-IOV VF: get mac from adapter */
 884                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 885                         vnic_dev_get_mac_addr, pp->mac_addr);
 886                 if (err) {
 887                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
 888                         memcpy(pp, &prev_pp, sizeof(*pp));
 889                         return enic_dev_status_to_errno(err);
 890                 }
 891         }
 892
 893         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
 894         if (err) {
 895                 if (restore_pp) {
 896                         /* Things are still the way they were: Implicit
 897                          * DISASSOCIATE failed
 898                          */
 899                         memcpy(pp, &prev_pp, sizeof(*pp));
 900                 } else {
 901                         memset(pp, 0, sizeof(*pp));
 902                         if (vf == PORT_SELF_VF)
 903                                 eth_zero_addr(netdev->dev_addr);
 904                 }
 905         } else {
 906                 /* Set flag to indicate that the port assoc/disassoc
 907                  * request has been sent out to fw
 908                  */
 909                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
 910
 911                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
 912                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
 913                         eth_zero_addr(pp->mac_addr);
 914                         if (vf == PORT_SELF_VF)
 915                                 eth_zero_addr(netdev->dev_addr);
 916                 }
 917         }
 918
 919         if (vf == PORT_SELF_VF)
 920                 eth_zero_addr(pp->vf_mac);
 921
 922         return err;
 923 }
 924
 925 static int enic_get_vf_port(struct net_device *netdev, int vf,
 926         struct sk_buff *skb)
 927 {
 928         struct enic *enic = netdev_priv(netdev);
 929         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
 930         struct enic_port_profile *pp;
 931         int err;
 932
 933         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 934         if (err)
 935                 return err;
 936
 937         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
 938                 return -ENODATA;
 939
 940         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
 941         if (err)
 942                 return err;
 943
 944         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
 945             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
 946             ((pp->set & ENIC_SET_NAME) &&
 947              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
 948             ((pp->set & ENIC_SET_INSTANCE) &&
 949              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
 950                      pp->instance_uuid)) ||
 951             ((pp->set & ENIC_SET_HOST) &&
 952              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
 953                 goto nla_put_failure;
 954         return 0;
 955
 956 nla_put_failure:
 957         return -EMSGSIZE;
 958 }
 959
 960 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 961 {
 962         struct enic *enic = vnic_dev_priv(rq->vdev);
 963
 964         if (!buf->os_buf)
 965                 return;
 966
 967         pci_unmap_single(enic->pdev, buf->dma_addr,
 968                 buf->len, PCI_DMA_FROMDEVICE);
 969         dev_kfree_skb_any(buf->os_buf);
 970         buf->os_buf = NULL;
 971 }
 972
 973 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 974 {
 975         struct enic *enic = vnic_dev_priv(rq->vdev);
 976         struct net_device *netdev = enic->netdev;
 977         struct sk_buff *skb;
 978         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
 979         unsigned int os_buf_index = 0;
 980         dma_addr_t dma_addr;
 981         struct vnic_rq_buf *buf = rq->to_use;
 982
 983         if (buf->os_buf) {
 984                 enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
 985                                    buf->len);
 986
 987                 return 0;
 988         }
 989         skb = netdev_alloc_skb_ip_align(netdev, len);
 990         if (!skb)
 991                 return -ENOMEM;
 992
 993         dma_addr = pci_map_single(enic->pdev, skb->data, len,
 994                                   PCI_DMA_FROMDEVICE);
 995         if (unlikely(enic_dma_map_check(enic, dma_addr))) {
 996                 dev_kfree_skb(skb);
 997                 return -ENOMEM;
 998         }
 999
1000         enic_queue_rq_desc(rq, skb, os_buf_index,
1001                 dma_addr, len);
1002
1003         return 0;
1004 }
1005
1006 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1007                                       u32 pkt_len)
1008 {
1009         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1010                 pkt_size->large_pkt_bytes_cnt += pkt_len;
1011         else
1012                 pkt_size->small_pkt_bytes_cnt += pkt_len;
1013 }
1014
1015 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1016                              struct vnic_rq_buf *buf, u16 len)
1017 {
1018         struct enic *enic = netdev_priv(netdev);
1019         struct sk_buff *new_skb;
1020
1021         if (len > enic->rx_copybreak)
1022                 return false;
1023         new_skb = netdev_alloc_skb_ip_align(netdev, len);
1024         if (!new_skb)
1025                 return false;
1026         pci_dma_sync_single_for_cpu(enic->pdev, buf->dma_addr, len,
1027                                     DMA_FROM_DEVICE);
1028         memcpy(new_skb->data, (*skb)->data, len);
1029         *skb = new_skb;
1030
1031         return true;
1032 }
1033
1034 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1035         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1036         int skipped, void *opaque)
1037 {
1038         struct enic *enic = vnic_dev_priv(rq->vdev);
1039         struct net_device *netdev = enic->netdev;
1040         struct sk_buff *skb;
1041         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1042
1043         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1044         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1045         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1046         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1047         u8 packet_error;
1048         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1049         u32 rss_hash;
1050
1051         if (skipped)
1052                 return;
1053
1054         skb = buf->os_buf;
1055
1056         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1057                 &type, &color, &q_number, &completed_index,
1058                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1059                 &csum_not_calc, &rss_hash, &bytes_written,
1060                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1061                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1062                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1063                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1064                 &fcs_ok);
1065
1066         if (packet_error) {
1067
1068                 if (!fcs_ok) {
1069                         if (bytes_written > 0)
1070                                 enic->rq_bad_fcs++;
1071                         else if (bytes_written == 0)
1072                                 enic->rq_truncated_pkts++;
1073                 }
1074
1075                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1076                                  PCI_DMA_FROMDEVICE);
1077                 dev_kfree_skb_any(skb);
1078                 buf->os_buf = NULL;
1079
1080                 return;
1081         }
1082
1083         if (eop && bytes_written > 0) {
1084
1085                 /* Good receive
1086                  */
1087
1088                 if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1089                         buf->os_buf = NULL;
1090                         pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1091                                          PCI_DMA_FROMDEVICE);
1092                 }
1093                 prefetch(skb->data - NET_IP_ALIGN);
1094
1095                 skb_put(skb, bytes_written);
1096                 skb->protocol = eth_type_trans(skb, netdev);
1097                 skb_record_rx_queue(skb, q_number);
1098                 if (netdev->features & NETIF_F_RXHASH) {
1099                         skb_set_hash(skb, rss_hash,
1100                                      (rss_type &
1101                                       (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
1102                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
1103                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
1104                                      PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
1105                 }
1106
1107                 /* Hardware does not provide whole packet checksum. It only
1108                  * provides pseudo checksum. Since hw validates the packet
1109                  * checksum but not provide us the checksum value. use
1110                  * CHECSUM_UNNECESSARY.
1111                  */
1112                 if ((netdev->features & NETIF_F_RXCSUM) && tcp_udp_csum_ok &&
1113                     ipv4_csum_ok)
1114                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1115
1116                 if (vlan_stripped)
1117                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1118
1119                 skb_mark_napi_id(skb, &enic->napi[rq->index]);
1120                 if (enic_poll_busy_polling(rq) ||
1121                     !(netdev->features & NETIF_F_GRO))
1122                         netif_receive_skb(skb);
1123                 else
1124                         napi_gro_receive(&enic->napi[q_number], skb);
1125                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1126                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1127                                                   bytes_written);
1128         } else {
1129
1130                 /* Buffer overflow
1131                  */
1132
1133                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1134                                  PCI_DMA_FROMDEVICE);
1135                 dev_kfree_skb_any(skb);
1136                 buf->os_buf = NULL;
1137         }
1138 }
1139
1140 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1141         u8 type, u16 q_number, u16 completed_index, void *opaque)
1142 {
1143         struct enic *enic = vnic_dev_priv(vdev);
1144
1145         vnic_rq_service(&enic->rq[q_number], cq_desc,
1146                 completed_index, VNIC_RQ_RETURN_DESC,
1147                 enic_rq_indicate_buf, opaque);
1148
1149         return 0;
1150 }
1151
1152 static int enic_poll(struct napi_struct *napi, int budget)
1153 {
1154         struct net_device *netdev = napi->dev;
1155         struct enic *enic = netdev_priv(netdev);
1156         unsigned int cq_rq = enic_cq_rq(enic, 0);
1157         unsigned int cq_wq = enic_cq_wq(enic, 0);
1158         unsigned int intr = enic_legacy_io_intr();
1159         unsigned int rq_work_to_do = budget;
1160         unsigned int wq_work_to_do = -1; /* no limit */
1161         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1162         int err;
1163
1164         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1165                                        enic_wq_service, NULL);
1166
1167         if (!enic_poll_lock_napi(&enic->rq[cq_rq])) {
1168                 if (wq_work_done > 0)
1169                         vnic_intr_return_credits(&enic->intr[intr],
1170                                                  wq_work_done,
1171                                                  0 /* dont unmask intr */,
1172                                                  0 /* dont reset intr timer */);
1173                 return budget;
1174         }
1175
1176         if (budget > 0)
1177                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1178                         rq_work_to_do, enic_rq_service, NULL);
1179
1180         /* Accumulate intr event credits for this polling
1181          * cycle.  An intr event is the completion of a
1182          * a WQ or RQ packet.
1183          */
1184
1185         work_done = rq_work_done + wq_work_done;
1186
1187         if (work_done > 0)
1188                 vnic_intr_return_credits(&enic->intr[intr],
1189                         work_done,
1190                         0 /* don't unmask intr */,
1191                         0 /* don't reset intr timer */);
1192
1193         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1194         enic_poll_unlock_napi(&enic->rq[cq_rq], napi);
1195
1196         /* Buffer allocation failed. Stay in polling
1197          * mode so we can try to fill the ring again.
1198          */
1199
1200         if (err)
1201                 rq_work_done = rq_work_to_do;
1202
1203         if (rq_work_done < rq_work_to_do) {
1204
1205                 /* Some work done, but not enough to stay in polling,
1206                  * exit polling
1207                  */
1208
1209                 napi_complete(napi);
1210                 vnic_intr_unmask(&enic->intr[intr]);
1211         }
1212
1213         return rq_work_done;
1214 }
1215
1216 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1217 {
1218         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1219         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1220         u32 timer = cq->tobe_rx_coal_timeval;
1221
1222         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1223                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1224                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1225         }
1226 }
1227
1228 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1229 {
1230         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1231         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1232         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1233         int index;
1234         u32 timer;
1235         u32 range_start;
1236         u32 traffic;
1237         u64 delta;
1238         ktime_t now = ktime_get();
1239
1240         delta = ktime_us_delta(now, cq->prev_ts);
1241         if (delta < ENIC_AIC_TS_BREAK)
1242                 return;
1243         cq->prev_ts = now;
1244
1245         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1246                   pkt_size_counter->small_pkt_bytes_cnt;
1247         /* The table takes Mbps
1248          * traffic *= 8    => bits
1249          * traffic *= (10^6 / delta)    => bps
1250          * traffic /= 10^6     => Mbps
1251          *
1252          * Combining, traffic *= (8 / delta)
1253          */
1254
1255         traffic <<= 3;
1256         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1257
1258         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1259                 if (traffic < mod_table[index].rx_rate)
1260                         break;
1261         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1262                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1263                       rx_coal->small_pkt_range_start :
1264                       rx_coal->large_pkt_range_start;
1265         timer = range_start + ((rx_coal->range_end - range_start) *
1266                                mod_table[index].range_percent / 100);
1267         /* Damping */
1268         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1269
1270         pkt_size_counter->large_pkt_bytes_cnt = 0;
1271         pkt_size_counter->small_pkt_bytes_cnt = 0;
1272 }
1273
1274 #ifdef CONFIG_RFS_ACCEL
1275 static void enic_free_rx_cpu_rmap(struct enic *enic)
1276 {
1277         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1278         enic->netdev->rx_cpu_rmap = NULL;
1279 }
1280
1281 static void enic_set_rx_cpu_rmap(struct enic *enic)
1282 {
1283         int i, res;
1284
1285         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1286                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1287                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1288                         return;
1289                 for (i = 0; i < enic->rq_count; i++) {
1290                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1291                                                enic->msix_entry[i].vector);
1292                         if (unlikely(res)) {
1293                                 enic_free_rx_cpu_rmap(enic);
1294                                 return;
1295                         }
1296                 }
1297         }
1298 }
1299
1300 #else
1301
1302 static void enic_free_rx_cpu_rmap(struct enic *enic)
1303 {
1304 }
1305
1306 static void enic_set_rx_cpu_rmap(struct enic *enic)
1307 {
1308 }
1309
1310 #endif /* CONFIG_RFS_ACCEL */
1311
1312 #ifdef CONFIG_NET_RX_BUSY_POLL
1313 static int enic_busy_poll(struct napi_struct *napi)
1314 {
1315         struct net_device *netdev = napi->dev;
1316         struct enic *enic = netdev_priv(netdev);
1317         unsigned int rq = (napi - &enic->napi[0]);
1318         unsigned int cq = enic_cq_rq(enic, rq);
1319         unsigned int intr = enic_msix_rq_intr(enic, rq);
1320         unsigned int work_to_do = -1; /* clean all pkts possible */
1321         unsigned int work_done;
1322
1323         if (!enic_poll_lock_poll(&enic->rq[rq]))
1324                 return LL_FLUSH_BUSY;
1325         work_done = vnic_cq_service(&enic->cq[cq], work_to_do,
1326                                     enic_rq_service, NULL);
1327
1328         if (work_done > 0)
1329                 vnic_intr_return_credits(&enic->intr[intr],
1330                                          work_done, 0, 0);
1331         vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1332         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1333                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1334         enic_poll_unlock_poll(&enic->rq[rq]);
1335
1336         return work_done;
1337 }
1338 #endif /* CONFIG_NET_RX_BUSY_POLL */
1339
1340 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1341 {
1342         struct net_device *netdev = napi->dev;
1343         struct enic *enic = netdev_priv(netdev);
1344         unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1345         struct vnic_wq *wq = &enic->wq[wq_index];
1346         unsigned int cq;
1347         unsigned int intr;
1348         unsigned int wq_work_to_do = -1; /* clean all desc possible */
1349         unsigned int wq_work_done;
1350         unsigned int wq_irq;
1351
1352         wq_irq = wq->index;
1353         cq = enic_cq_wq(enic, wq_irq);
1354         intr = enic_msix_wq_intr(enic, wq_irq);
1355         wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1356                                        enic_wq_service, NULL);
1357
1358         vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1359                                  0 /* don't unmask intr */,
1360                                  1 /* reset intr timer */);
1361         if (!wq_work_done) {
1362                 napi_complete(napi);
1363                 vnic_intr_unmask(&enic->intr[intr]);
1364                 return 0;
1365         }
1366
1367         return budget;
1368 }
1369
1370 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1371 {
1372         struct net_device *netdev = napi->dev;
1373         struct enic *enic = netdev_priv(netdev);
1374         unsigned int rq = (napi - &enic->napi[0]);
1375         unsigned int cq = enic_cq_rq(enic, rq);
1376         unsigned int intr = enic_msix_rq_intr(enic, rq);
1377         unsigned int work_to_do = budget;
1378         unsigned int work_done = 0;
1379         int err;
1380
1381         if (!enic_poll_lock_napi(&enic->rq[rq]))
1382                 return budget;
1383         /* Service RQ
1384          */
1385
1386         if (budget > 0)
1387                 work_done = vnic_cq_service(&enic->cq[cq],
1388                         work_to_do, enic_rq_service, NULL);
1389
1390         /* Return intr event credits for this polling
1391          * cycle.  An intr event is the completion of a
1392          * RQ packet.
1393          */
1394
1395         if (work_done > 0)
1396                 vnic_intr_return_credits(&enic->intr[intr],
1397                         work_done,
1398                         0 /* don't unmask intr */,
1399                         0 /* don't reset intr timer */);
1400
1401         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1402
1403         /* Buffer allocation failed. Stay in polling mode
1404          * so we can try to fill the ring again.
1405          */
1406
1407         if (err)
1408                 work_done = work_to_do;
1409         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1410                 /* Call the function which refreshes
1411                  * the intr coalescing timer value based on
1412                  * the traffic.  This is supported only in
1413                  * the case of MSI-x mode
1414                  */
1415                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1416
1417         enic_poll_unlock_napi(&enic->rq[rq], napi);
1418         if (work_done < work_to_do) {
1419
1420                 /* Some work done, but not enough to stay in polling,
1421                  * exit polling
1422                  */
1423
1424                 napi_complete(napi);
1425                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1426                         enic_set_int_moderation(enic, &enic->rq[rq]);
1427                 vnic_intr_unmask(&enic->intr[intr]);
1428         }
1429
1430         return work_done;
1431 }
1432
1433 static void enic_notify_timer(unsigned long data)
1434 {
1435         struct enic *enic = (struct enic *)data;
1436
1437         enic_notify_check(enic);
1438
1439         mod_timer(&enic->notify_timer,
1440                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1441 }
1442
1443 static void enic_free_intr(struct enic *enic)
1444 {
1445         struct net_device *netdev = enic->netdev;
1446         unsigned int i;
1447
1448         enic_free_rx_cpu_rmap(enic);
1449         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1450         case VNIC_DEV_INTR_MODE_INTX:
1451                 free_irq(enic->pdev->irq, netdev);
1452                 break;
1453         case VNIC_DEV_INTR_MODE_MSI:
1454                 free_irq(enic->pdev->irq, enic);
1455                 break;
1456         case VNIC_DEV_INTR_MODE_MSIX:
1457                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1458                         if (enic->msix[i].requested)
1459                                 free_irq(enic->msix_entry[i].vector,
1460                                         enic->msix[i].devid);
1461                 break;
1462         default:
1463                 break;
1464         }
1465 }
1466
1467 static int enic_request_intr(struct enic *enic)
1468 {
1469         struct net_device *netdev = enic->netdev;
1470         unsigned int i, intr;
1471         int err = 0;
1472
1473         enic_set_rx_cpu_rmap(enic);
1474         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1475
1476         case VNIC_DEV_INTR_MODE_INTX:
1477
1478                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1479                         IRQF_SHARED, netdev->name, netdev);
1480                 break;
1481
1482         case VNIC_DEV_INTR_MODE_MSI:
1483
1484                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1485                         0, netdev->name, enic);
1486                 break;
1487
1488         case VNIC_DEV_INTR_MODE_MSIX:
1489
1490                 for (i = 0; i < enic->rq_count; i++) {
1491                         intr = enic_msix_rq_intr(enic, i);
1492                         snprintf(enic->msix[intr].devname,
1493                                 sizeof(enic->msix[intr].devname),
1494                                 "%.11s-rx-%d", netdev->name, i);
1495                         enic->msix[intr].isr = enic_isr_msix;
1496                         enic->msix[intr].devid = &enic->napi[i];
1497                 }
1498
1499                 for (i = 0; i < enic->wq_count; i++) {
1500                         int wq = enic_cq_wq(enic, i);
1501
1502                         intr = enic_msix_wq_intr(enic, i);
1503                         snprintf(enic->msix[intr].devname,
1504                                 sizeof(enic->msix[intr].devname),
1505                                 "%.11s-tx-%d", netdev->name, i);
1506                         enic->msix[intr].isr = enic_isr_msix;
1507                         enic->msix[intr].devid = &enic->napi[wq];
1508                 }
1509
1510                 intr = enic_msix_err_intr(enic);
1511                 snprintf(enic->msix[intr].devname,
1512                         sizeof(enic->msix[intr].devname),
1513                         "%.11s-err", netdev->name);
1514                 enic->msix[intr].isr = enic_isr_msix_err;
1515                 enic->msix[intr].devid = enic;
1516
1517                 intr = enic_msix_notify_intr(enic);
1518                 snprintf(enic->msix[intr].devname,
1519                         sizeof(enic->msix[intr].devname),
1520                         "%.11s-notify", netdev->name);
1521                 enic->msix[intr].isr = enic_isr_msix_notify;
1522                 enic->msix[intr].devid = enic;
1523
1524                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1525                         enic->msix[i].requested = 0;
1526
1527                 for (i = 0; i < enic->intr_count; i++) {
1528                         err = request_irq(enic->msix_entry[i].vector,
1529                                 enic->msix[i].isr, 0,
1530                                 enic->msix[i].devname,
1531                                 enic->msix[i].devid);
1532                         if (err) {
1533                                 enic_free_intr(enic);
1534                                 break;
1535                         }
1536                         enic->msix[i].requested = 1;
1537                 }
1538
1539                 break;
1540
1541         default:
1542                 break;
1543         }
1544
1545         return err;
1546 }
1547
1548 static void enic_synchronize_irqs(struct enic *enic)
1549 {
1550         unsigned int i;
1551
1552         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1553         case VNIC_DEV_INTR_MODE_INTX:
1554         case VNIC_DEV_INTR_MODE_MSI:
1555                 synchronize_irq(enic->pdev->irq);
1556                 break;
1557         case VNIC_DEV_INTR_MODE_MSIX:
1558                 for (i = 0; i < enic->intr_count; i++)
1559                         synchronize_irq(enic->msix_entry[i].vector);
1560                 break;
1561         default:
1562                 break;
1563         }
1564 }
1565
1566 static void enic_set_rx_coal_setting(struct enic *enic)
1567 {
1568         unsigned int speed;
1569         int index = -1;
1570         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1571
1572         /* If intr mode is not MSIX, do not do adaptive coalescing */
1573         if (VNIC_DEV_INTR_MODE_MSIX != vnic_dev_get_intr_mode(enic->vdev)) {
1574                 netdev_info(enic->netdev, "INTR mode is not MSIX, Not initializing adaptive coalescing");
1575                 return;
1576         }
1577
1578         /* 1. Read the link speed from fw
1579          * 2. Pick the default range for the speed
1580          * 3. Update it in enic->rx_coalesce_setting
1581          */
1582         speed = vnic_dev_port_speed(enic->vdev);
1583         if (ENIC_LINK_SPEED_10G < speed)
1584                 index = ENIC_LINK_40G_INDEX;
1585         else if (ENIC_LINK_SPEED_4G < speed)
1586                 index = ENIC_LINK_10G_INDEX;
1587         else
1588                 index = ENIC_LINK_4G_INDEX;
1589
1590         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1591         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1592         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1593
1594         /* Start with the value provided by UCSM */
1595         for (index = 0; index < enic->rq_count; index++)
1596                 enic->cq[index].cur_rx_coal_timeval =
1597                                 enic->config.intr_timer_usec;
1598
1599         rx_coal->use_adaptive_rx_coalesce = 1;
1600 }
1601
1602 static int enic_dev_notify_set(struct enic *enic)
1603 {
1604         int err;
1605
1606         spin_lock_bh(&enic->devcmd_lock);
1607         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1608         case VNIC_DEV_INTR_MODE_INTX:
1609                 err = vnic_dev_notify_set(enic->vdev,
1610                         enic_legacy_notify_intr());
1611                 break;
1612         case VNIC_DEV_INTR_MODE_MSIX:
1613                 err = vnic_dev_notify_set(enic->vdev,
1614                         enic_msix_notify_intr(enic));
1615                 break;
1616         default:
1617                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1618                 break;
1619         }
1620         spin_unlock_bh(&enic->devcmd_lock);
1621
1622         return err;
1623 }
1624
1625 static void enic_notify_timer_start(struct enic *enic)
1626 {
1627         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1628         case VNIC_DEV_INTR_MODE_MSI:
1629                 mod_timer(&enic->notify_timer, jiffies);
1630                 break;
1631         default:
1632                 /* Using intr for notification for INTx/MSI-X */
1633                 break;
1634         }
1635 }
1636
1637 /* rtnl lock is held, process context */
1638 static int enic_open(struct net_device *netdev)
1639 {
1640         struct enic *enic = netdev_priv(netdev);
1641         unsigned int i;
1642         int err;
1643
1644         err = enic_request_intr(enic);
1645         if (err) {
1646                 netdev_err(netdev, "Unable to request irq.\n");
1647                 return err;
1648         }
1649
1650         err = enic_dev_notify_set(enic);
1651         if (err) {
1652                 netdev_err(netdev,
1653                         "Failed to alloc notify buffer, aborting.\n");
1654                 goto err_out_free_intr;
1655         }
1656
1657         for (i = 0; i < enic->rq_count; i++) {
1658                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1659                 /* Need at least one buffer on ring to get going */
1660                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1661                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1662                         err = -ENOMEM;
1663                         goto err_out_free_rq;
1664                 }
1665         }
1666
1667         for (i = 0; i < enic->wq_count; i++)
1668                 vnic_wq_enable(&enic->wq[i]);
1669         for (i = 0; i < enic->rq_count; i++)
1670                 vnic_rq_enable(&enic->rq[i]);
1671
1672         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1673                 enic_dev_add_station_addr(enic);
1674
1675         enic_set_rx_mode(netdev);
1676
1677         netif_tx_wake_all_queues(netdev);
1678
1679         for (i = 0; i < enic->rq_count; i++) {
1680                 enic_busy_poll_init_lock(&enic->rq[i]);
1681                 napi_enable(&enic->napi[i]);
1682         }
1683         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1684                 for (i = 0; i < enic->wq_count; i++)
1685                         napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1686         enic_dev_enable(enic);
1687
1688         for (i = 0; i < enic->intr_count; i++)
1689                 vnic_intr_unmask(&enic->intr[i]);
1690
1691         enic_notify_timer_start(enic);
1692         enic_rfs_flw_tbl_init(enic);
1693
1694         return 0;
1695
1696 err_out_free_rq:
1697         for (i = 0; i < enic->rq_count; i++)
1698                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1699         enic_dev_notify_unset(enic);
1700 err_out_free_intr:
1701         enic_free_intr(enic);
1702
1703         return err;
1704 }
1705
1706 /* rtnl lock is held, process context */
1707 static int enic_stop(struct net_device *netdev)
1708 {
1709         struct enic *enic = netdev_priv(netdev);
1710         unsigned int i;
1711         int err;
1712
1713         for (i = 0; i < enic->intr_count; i++) {
1714                 vnic_intr_mask(&enic->intr[i]);
1715                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1716         }
1717
1718         enic_synchronize_irqs(enic);
1719
1720         del_timer_sync(&enic->notify_timer);
1721         enic_rfs_flw_tbl_free(enic);
1722
1723         enic_dev_disable(enic);
1724
1725         for (i = 0; i < enic->rq_count; i++) {
1726                 napi_disable(&enic->napi[i]);
1727                 local_bh_disable();
1728                 while (!enic_poll_lock_napi(&enic->rq[i]))
1729                         mdelay(1);
1730                 local_bh_enable();
1731         }
1732
1733         netif_carrier_off(netdev);
1734         netif_tx_disable(netdev);
1735         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1736                 for (i = 0; i < enic->wq_count; i++)
1737                         napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1738
1739         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1740                 enic_dev_del_station_addr(enic);
1741
1742         for (i = 0; i < enic->wq_count; i++) {
1743                 err = vnic_wq_disable(&enic->wq[i]);
1744                 if (err)
1745                         return err;
1746         }
1747         for (i = 0; i < enic->rq_count; i++) {
1748                 err = vnic_rq_disable(&enic->rq[i]);
1749                 if (err)
1750                         return err;
1751         }
1752
1753         enic_dev_notify_unset(enic);
1754         enic_free_intr(enic);
1755
1756         for (i = 0; i < enic->wq_count; i++)
1757                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1758         for (i = 0; i < enic->rq_count; i++)
1759                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1760         for (i = 0; i < enic->cq_count; i++)
1761                 vnic_cq_clean(&enic->cq[i]);
1762         for (i = 0; i < enic->intr_count; i++)
1763                 vnic_intr_clean(&enic->intr[i]);
1764
1765         return 0;
1766 }
1767
1768 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1769 {
1770         struct enic *enic = netdev_priv(netdev);
1771         int running = netif_running(netdev);
1772
1773         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1774                 return -EINVAL;
1775
1776         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1777                 return -EOPNOTSUPP;
1778
1779         if (running)
1780                 enic_stop(netdev);
1781
1782         netdev->mtu = new_mtu;
1783
1784         if (netdev->mtu > enic->port_mtu)
1785                 netdev_warn(netdev,
1786                         "interface MTU (%d) set higher than port MTU (%d)\n",
1787                         netdev->mtu, enic->port_mtu);
1788
1789         if (running)
1790                 enic_open(netdev);
1791
1792         return 0;
1793 }
1794
1795 static void enic_change_mtu_work(struct work_struct *work)
1796 {
1797         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1798         struct net_device *netdev = enic->netdev;
1799         int new_mtu = vnic_dev_mtu(enic->vdev);
1800         int err;
1801         unsigned int i;
1802
1803         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1804
1805         rtnl_lock();
1806
1807         /* Stop RQ */
1808         del_timer_sync(&enic->notify_timer);
1809
1810         for (i = 0; i < enic->rq_count; i++)
1811                 napi_disable(&enic->napi[i]);
1812
1813         vnic_intr_mask(&enic->intr[0]);
1814         enic_synchronize_irqs(enic);
1815         err = vnic_rq_disable(&enic->rq[0]);
1816         if (err) {
1817                 rtnl_unlock();
1818                 netdev_err(netdev, "Unable to disable RQ.\n");
1819                 return;
1820         }
1821         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1822         vnic_cq_clean(&enic->cq[0]);
1823         vnic_intr_clean(&enic->intr[0]);
1824
1825         /* Fill RQ with new_mtu-sized buffers */
1826         netdev->mtu = new_mtu;
1827         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1828         /* Need at least one buffer on ring to get going */
1829         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1830                 rtnl_unlock();
1831                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1832                 return;
1833         }
1834
1835         /* Start RQ */
1836         vnic_rq_enable(&enic->rq[0]);
1837         napi_enable(&enic->napi[0]);
1838         vnic_intr_unmask(&enic->intr[0]);
1839         enic_notify_timer_start(enic);
1840
1841         rtnl_unlock();
1842
1843         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1844 }
1845
1846 #ifdef CONFIG_NET_POLL_CONTROLLER
1847 static void enic_poll_controller(struct net_device *netdev)
1848 {
1849         struct enic *enic = netdev_priv(netdev);
1850         struct vnic_dev *vdev = enic->vdev;
1851         unsigned int i, intr;
1852
1853         switch (vnic_dev_get_intr_mode(vdev)) {
1854         case VNIC_DEV_INTR_MODE_MSIX:
1855                 for (i = 0; i < enic->rq_count; i++) {
1856                         intr = enic_msix_rq_intr(enic, i);
1857                         enic_isr_msix(enic->msix_entry[intr].vector,
1858                                       &enic->napi[i]);
1859                 }
1860
1861                 for (i = 0; i < enic->wq_count; i++) {
1862                         intr = enic_msix_wq_intr(enic, i);
1863                         enic_isr_msix(enic->msix_entry[intr].vector,
1864                                       &enic->napi[enic_cq_wq(enic, i)]);
1865                 }
1866
1867                 break;
1868         case VNIC_DEV_INTR_MODE_MSI:
1869                 enic_isr_msi(enic->pdev->irq, enic);
1870                 break;
1871         case VNIC_DEV_INTR_MODE_INTX:
1872                 enic_isr_legacy(enic->pdev->irq, netdev);
1873                 break;
1874         default:
1875                 break;
1876         }
1877 }
1878 #endif
1879
1880 static int enic_dev_wait(struct vnic_dev *vdev,
1881         int (*start)(struct vnic_dev *, int),
1882         int (*finished)(struct vnic_dev *, int *),
1883         int arg)
1884 {
1885         unsigned long time;
1886         int done;
1887         int err;
1888
1889         BUG_ON(in_interrupt());
1890
1891         err = start(vdev, arg);
1892         if (err)
1893                 return err;
1894
1895         /* Wait for func to complete...2 seconds max
1896          */
1897
1898         time = jiffies + (HZ * 2);
1899         do {
1900
1901                 err = finished(vdev, &done);
1902                 if (err)
1903                         return err;
1904
1905                 if (done)
1906                         return 0;
1907
1908                 schedule_timeout_uninterruptible(HZ / 10);
1909
1910         } while (time_after(time, jiffies));
1911
1912         return -ETIMEDOUT;
1913 }
1914
1915 static int enic_dev_open(struct enic *enic)
1916 {
1917         int err;
1918
1919         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1920                 vnic_dev_open_done, 0);
1921         if (err)
1922                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1923                         err);
1924
1925         return err;
1926 }
1927
1928 static int enic_dev_hang_reset(struct enic *enic)
1929 {
1930         int err;
1931
1932         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1933                 vnic_dev_hang_reset_done, 0);
1934         if (err)
1935                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1936                         err);
1937
1938         return err;
1939 }
1940
1941 int __enic_set_rsskey(struct enic *enic)
1942 {
1943         union vnic_rss_key *rss_key_buf_va;
1944         dma_addr_t rss_key_buf_pa;
1945         int i, kidx, bidx, err;
1946
1947         rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
1948                                                sizeof(union vnic_rss_key),
1949                                                &rss_key_buf_pa);
1950         if (!rss_key_buf_va)
1951                 return -ENOMEM;
1952
1953         for (i = 0; i < ENIC_RSS_LEN; i++) {
1954                 kidx = i / ENIC_RSS_BYTES_PER_KEY;
1955                 bidx = i % ENIC_RSS_BYTES_PER_KEY;
1956                 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
1957         }
1958         spin_lock_bh(&enic->devcmd_lock);
1959         err = enic_set_rss_key(enic,
1960                 rss_key_buf_pa,
1961                 sizeof(union vnic_rss_key));
1962         spin_unlock_bh(&enic->devcmd_lock);
1963
1964         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1965                 rss_key_buf_va, rss_key_buf_pa);
1966
1967         return err;
1968 }
1969
1970 static int enic_set_rsskey(struct enic *enic)
1971 {
1972         netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
1973
1974         return __enic_set_rsskey(enic);
1975 }
1976
1977 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1978 {
1979         dma_addr_t rss_cpu_buf_pa;
1980         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1981         unsigned int i;
1982         int err;
1983
1984         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1985                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1986         if (!rss_cpu_buf_va)
1987                 return -ENOMEM;
1988
1989         for (i = 0; i < (1 << rss_hash_bits); i++)
1990                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1991
1992         spin_lock_bh(&enic->devcmd_lock);
1993         err = enic_set_rss_cpu(enic,
1994                 rss_cpu_buf_pa,
1995                 sizeof(union vnic_rss_cpu));
1996         spin_unlock_bh(&enic->devcmd_lock);
1997
1998         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1999                 rss_cpu_buf_va, rss_cpu_buf_pa);
2000
2001         return err;
2002 }
2003
2004 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2005         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2006 {
2007         const u8 tso_ipid_split_en = 0;
2008         const u8 ig_vlan_strip_en = 1;
2009         int err;
2010
2011         /* Enable VLAN tag stripping.
2012         */
2013
2014         spin_lock_bh(&enic->devcmd_lock);
2015         err = enic_set_nic_cfg(enic,
2016                 rss_default_cpu, rss_hash_type,
2017                 rss_hash_bits, rss_base_cpu,
2018                 rss_enable, tso_ipid_split_en,
2019                 ig_vlan_strip_en);
2020         spin_unlock_bh(&enic->devcmd_lock);
2021
2022         return err;
2023 }
2024
2025 static int enic_set_rss_nic_cfg(struct enic *enic)
2026 {
2027         struct device *dev = enic_get_dev(enic);
2028         const u8 rss_default_cpu = 0;
2029         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
2030                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
2031                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
2032                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2033         const u8 rss_hash_bits = 7;
2034         const u8 rss_base_cpu = 0;
2035         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2036
2037         if (rss_enable) {
2038                 if (!enic_set_rsskey(enic)) {
2039                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
2040                                 rss_enable = 0;
2041                                 dev_warn(dev, "RSS disabled, "
2042                                         "Failed to set RSS cpu indirection table.");
2043                         }
2044                 } else {
2045                         rss_enable = 0;
2046                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2047                 }
2048         }
2049
2050         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2051                 rss_hash_bits, rss_base_cpu, rss_enable);
2052 }
2053
2054 static void enic_reset(struct work_struct *work)
2055 {
2056         struct enic *enic = container_of(work, struct enic, reset);
2057
2058         if (!netif_running(enic->netdev))
2059                 return;
2060
2061         rtnl_lock();
2062
2063         spin_lock(&enic->enic_api_lock);
2064         enic_dev_hang_notify(enic);
2065         enic_stop(enic->netdev);
2066         enic_dev_hang_reset(enic);
2067         enic_reset_addr_lists(enic);
2068         enic_init_vnic_resources(enic);
2069         enic_set_rss_nic_cfg(enic);
2070         enic_dev_set_ig_vlan_rewrite_mode(enic);
2071         enic_open(enic->netdev);
2072         spin_unlock(&enic->enic_api_lock);
2073         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2074
2075         rtnl_unlock();
2076 }
2077
2078 static int enic_set_intr_mode(struct enic *enic)
2079 {
2080         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2081         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2082         unsigned int i;
2083
2084         /* Set interrupt mode (INTx, MSI, MSI-X) depending
2085          * on system capabilities.
2086          *
2087          * Try MSI-X first
2088          *
2089          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2090          * (the second to last INTR is used for WQ/RQ errors)
2091          * (the last INTR is used for notifications)
2092          */
2093
2094         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2095         for (i = 0; i < n + m + 2; i++)
2096                 enic->msix_entry[i].entry = i;
2097
2098         /* Use multiple RQs if RSS is enabled
2099          */
2100
2101         if (ENIC_SETTING(enic, RSS) &&
2102             enic->config.intr_mode < 1 &&
2103             enic->rq_count >= n &&
2104             enic->wq_count >= m &&
2105             enic->cq_count >= n + m &&
2106             enic->intr_count >= n + m + 2) {
2107
2108                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2109                                           n + m + 2, n + m + 2) > 0) {
2110
2111                         enic->rq_count = n;
2112                         enic->wq_count = m;
2113                         enic->cq_count = n + m;
2114                         enic->intr_count = n + m + 2;
2115
2116                         vnic_dev_set_intr_mode(enic->vdev,
2117                                 VNIC_DEV_INTR_MODE_MSIX);
2118
2119                         return 0;
2120                 }
2121         }
2122
2123         if (enic->config.intr_mode < 1 &&
2124             enic->rq_count >= 1 &&
2125             enic->wq_count >= m &&
2126             enic->cq_count >= 1 + m &&
2127             enic->intr_count >= 1 + m + 2) {
2128                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2129                                           1 + m + 2, 1 + m + 2) > 0) {
2130
2131                         enic->rq_count = 1;
2132                         enic->wq_count = m;
2133                         enic->cq_count = 1 + m;
2134                         enic->intr_count = 1 + m + 2;
2135
2136                         vnic_dev_set_intr_mode(enic->vdev,
2137                                 VNIC_DEV_INTR_MODE_MSIX);
2138
2139                         return 0;
2140                 }
2141         }
2142
2143         /* Next try MSI
2144          *
2145          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2146          */
2147
2148         if (enic->config.intr_mode < 2 &&
2149             enic->rq_count >= 1 &&
2150             enic->wq_count >= 1 &&
2151             enic->cq_count >= 2 &&
2152             enic->intr_count >= 1 &&
2153             !pci_enable_msi(enic->pdev)) {
2154
2155                 enic->rq_count = 1;
2156                 enic->wq_count = 1;
2157                 enic->cq_count = 2;
2158                 enic->intr_count = 1;
2159
2160                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2161
2162                 return 0;
2163         }
2164
2165         /* Next try INTx
2166          *
2167          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2168          * (the first INTR is used for WQ/RQ)
2169          * (the second INTR is used for WQ/RQ errors)
2170          * (the last INTR is used for notifications)
2171          */
2172
2173         if (enic->config.intr_mode < 3 &&
2174             enic->rq_count >= 1 &&
2175             enic->wq_count >= 1 &&
2176             enic->cq_count >= 2 &&
2177             enic->intr_count >= 3) {
2178
2179                 enic->rq_count = 1;
2180                 enic->wq_count = 1;
2181                 enic->cq_count = 2;
2182                 enic->intr_count = 3;
2183
2184                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2185
2186                 return 0;
2187         }
2188
2189         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2190
2191         return -EINVAL;
2192 }
2193
2194 static void enic_clear_intr_mode(struct enic *enic)
2195 {
2196         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2197         case VNIC_DEV_INTR_MODE_MSIX:
2198                 pci_disable_msix(enic->pdev);
2199                 break;
2200         case VNIC_DEV_INTR_MODE_MSI:
2201                 pci_disable_msi(enic->pdev);
2202                 break;
2203         default:
2204                 break;
2205         }
2206
2207         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2208 }
2209
2210 static const struct net_device_ops enic_netdev_dynamic_ops = {
2211         .ndo_open               = enic_open,
2212         .ndo_stop               = enic_stop,
2213         .ndo_start_xmit         = enic_hard_start_xmit,
2214         .ndo_get_stats64        = enic_get_stats,
2215         .ndo_validate_addr      = eth_validate_addr,
2216         .ndo_set_rx_mode        = enic_set_rx_mode,
2217         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2218         .ndo_change_mtu         = enic_change_mtu,
2219         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2220         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2221         .ndo_tx_timeout         = enic_tx_timeout,
2222         .ndo_set_vf_port        = enic_set_vf_port,
2223         .ndo_get_vf_port        = enic_get_vf_port,
2224         .ndo_set_vf_mac         = enic_set_vf_mac,
2225 #ifdef CONFIG_NET_POLL_CONTROLLER
2226         .ndo_poll_controller    = enic_poll_controller,
2227 #endif
2228 #ifdef CONFIG_RFS_ACCEL
2229         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2230 #endif
2231 #ifdef CONFIG_NET_RX_BUSY_POLL
2232         .ndo_busy_poll          = enic_busy_poll,
2233 #endif
2234 };
2235
2236 static const struct net_device_ops enic_netdev_ops = {
2237         .ndo_open               = enic_open,
2238         .ndo_stop               = enic_stop,
2239         .ndo_start_xmit         = enic_hard_start_xmit,
2240         .ndo_get_stats64        = enic_get_stats,
2241         .ndo_validate_addr      = eth_validate_addr,
2242         .ndo_set_mac_address    = enic_set_mac_address,
2243         .ndo_set_rx_mode        = enic_set_rx_mode,
2244         .ndo_change_mtu         = enic_change_mtu,
2245         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2246         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2247         .ndo_tx_timeout         = enic_tx_timeout,
2248         .ndo_set_vf_port        = enic_set_vf_port,
2249         .ndo_get_vf_port        = enic_get_vf_port,
2250         .ndo_set_vf_mac         = enic_set_vf_mac,
2251 #ifdef CONFIG_NET_POLL_CONTROLLER
2252         .ndo_poll_controller    = enic_poll_controller,
2253 #endif
2254 #ifdef CONFIG_RFS_ACCEL
2255         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2256 #endif
2257 #ifdef CONFIG_NET_RX_BUSY_POLL
2258         .ndo_busy_poll          = enic_busy_poll,
2259 #endif
2260 };
2261
2262 static void enic_dev_deinit(struct enic *enic)
2263 {
2264         unsigned int i;
2265
2266         for (i = 0; i < enic->rq_count; i++) {
2267                 napi_hash_del(&enic->napi[i]);
2268                 netif_napi_del(&enic->napi[i]);
2269         }
2270         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2271                 for (i = 0; i < enic->wq_count; i++)
2272                         netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2273
2274         enic_free_vnic_resources(enic);
2275         enic_clear_intr_mode(enic);
2276 }
2277
2278 static void enic_kdump_kernel_config(struct enic *enic)
2279 {
2280         if (is_kdump_kernel()) {
2281                 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2282                 enic->rq_count = 1;
2283                 enic->wq_count = 1;
2284                 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2285                 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2286                 enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2287         }
2288 }
2289
2290 static int enic_dev_init(struct enic *enic)
2291 {
2292         struct device *dev = enic_get_dev(enic);
2293         struct net_device *netdev = enic->netdev;
2294         unsigned int i;
2295         int err;
2296
2297         /* Get interrupt coalesce timer info */
2298         err = enic_dev_intr_coal_timer_info(enic);
2299         if (err) {
2300                 dev_warn(dev, "Using default conversion factor for "
2301                         "interrupt coalesce timer\n");
2302                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2303         }
2304
2305         /* Get vNIC configuration
2306          */
2307
2308         err = enic_get_vnic_config(enic);
2309         if (err) {
2310                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2311                 return err;
2312         }
2313
2314         /* Get available resource counts
2315          */
2316
2317         enic_get_res_counts(enic);
2318
2319         /* modify resource count if we are in kdump_kernel
2320          */
2321         enic_kdump_kernel_config(enic);
2322
2323         /* Set interrupt mode based on resource counts and system
2324          * capabilities
2325          */
2326
2327         err = enic_set_intr_mode(enic);
2328         if (err) {
2329                 dev_err(dev, "Failed to set intr mode based on resource "
2330                         "counts and system capabilities, aborting\n");
2331                 return err;
2332         }
2333
2334         /* Allocate and configure vNIC resources
2335          */
2336
2337         err = enic_alloc_vnic_resources(enic);
2338         if (err) {
2339                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2340                 goto err_out_free_vnic_resources;
2341         }
2342
2343         enic_init_vnic_resources(enic);
2344
2345         err = enic_set_rss_nic_cfg(enic);
2346         if (err) {
2347                 dev_err(dev, "Failed to config nic, aborting\n");
2348                 goto err_out_free_vnic_resources;
2349         }
2350
2351         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2352         default:
2353                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2354                 napi_hash_add(&enic->napi[0]);
2355                 break;
2356         case VNIC_DEV_INTR_MODE_MSIX:
2357                 for (i = 0; i < enic->rq_count; i++) {
2358                         netif_napi_add(netdev, &enic->napi[i],
2359                                 enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2360                         napi_hash_add(&enic->napi[i]);
2361                 }
2362                 for (i = 0; i < enic->wq_count; i++)
2363                         netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2364                                        enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2365                 break;
2366         }
2367
2368         return 0;
2369
2370 err_out_free_vnic_resources:
2371         enic_clear_intr_mode(enic);
2372         enic_free_vnic_resources(enic);
2373
2374         return err;
2375 }
2376
2377 static void enic_iounmap(struct enic *enic)
2378 {
2379         unsigned int i;
2380
2381         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2382                 if (enic->bar[i].vaddr)
2383                         iounmap(enic->bar[i].vaddr);
2384 }
2385
2386 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2387 {
2388         struct device *dev = &pdev->dev;
2389         struct net_device *netdev;
2390         struct enic *enic;
2391         int using_dac = 0;
2392         unsigned int i;
2393         int err;
2394 #ifdef CONFIG_PCI_IOV
2395         int pos = 0;
2396 #endif
2397         int num_pps = 1;
2398
2399         /* Allocate net device structure and initialize.  Private
2400          * instance data is initialized to zero.
2401          */
2402
2403         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2404                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2405         if (!netdev)
2406                 return -ENOMEM;
2407
2408         pci_set_drvdata(pdev, netdev);
2409
2410         SET_NETDEV_DEV(netdev, &pdev->dev);
2411
2412         enic = netdev_priv(netdev);
2413         enic->netdev = netdev;
2414         enic->pdev = pdev;
2415
2416         /* Setup PCI resources
2417          */
2418
2419         err = pci_enable_device_mem(pdev);
2420         if (err) {
2421                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2422                 goto err_out_free_netdev;
2423         }
2424
2425         err = pci_request_regions(pdev, DRV_NAME);
2426         if (err) {
2427                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2428                 goto err_out_disable_device;
2429         }
2430
2431         pci_set_master(pdev);
2432
2433         /* Query PCI controller on system for DMA addressing
2434          * limitation for the device.  Try 64-bit first, and
2435          * fail to 32-bit.
2436          */
2437
2438         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2439         if (err) {
2440                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2441                 if (err) {
2442                         dev_err(dev, "No usable DMA configuration, aborting\n");
2443                         goto err_out_release_regions;
2444                 }
2445                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2446                 if (err) {
2447                         dev_err(dev, "Unable to obtain %u-bit DMA "
2448                                 "for consistent allocations, aborting\n", 32);
2449                         goto err_out_release_regions;
2450                 }
2451         } else {
2452                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2453                 if (err) {
2454                         dev_err(dev, "Unable to obtain %u-bit DMA "
2455                                 "for consistent allocations, aborting\n", 64);
2456                         goto err_out_release_regions;
2457                 }
2458                 using_dac = 1;
2459         }
2460
2461         /* Map vNIC resources from BAR0-5
2462          */
2463
2464         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2465                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2466                         continue;
2467                 enic->bar[i].len = pci_resource_len(pdev, i);
2468                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2469                 if (!enic->bar[i].vaddr) {
2470                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2471                         err = -ENODEV;
2472                         goto err_out_iounmap;
2473                 }
2474                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2475         }
2476
2477         /* Register vNIC device
2478          */
2479
2480         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2481                 ARRAY_SIZE(enic->bar));
2482         if (!enic->vdev) {
2483                 dev_err(dev, "vNIC registration failed, aborting\n");
2484                 err = -ENODEV;
2485                 goto err_out_iounmap;
2486         }
2487
2488 #ifdef CONFIG_PCI_IOV
2489         /* Get number of subvnics */
2490         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2491         if (pos) {
2492                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2493                         &enic->num_vfs);
2494                 if (enic->num_vfs) {
2495                         err = pci_enable_sriov(pdev, enic->num_vfs);
2496                         if (err) {
2497                                 dev_err(dev, "SRIOV enable failed, aborting."
2498                                         " pci_enable_sriov() returned %d\n",
2499                                         err);
2500                                 goto err_out_vnic_unregister;
2501                         }
2502                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2503                         num_pps = enic->num_vfs;
2504                 }
2505         }
2506 #endif
2507
2508         /* Allocate structure for port profiles */
2509         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2510         if (!enic->pp) {
2511                 err = -ENOMEM;
2512                 goto err_out_disable_sriov_pp;
2513         }
2514
2515         /* Issue device open to get device in known state
2516          */
2517
2518         err = enic_dev_open(enic);
2519         if (err) {
2520                 dev_err(dev, "vNIC dev open failed, aborting\n");
2521                 goto err_out_disable_sriov;
2522         }
2523
2524         /* Setup devcmd lock
2525          */
2526
2527         spin_lock_init(&enic->devcmd_lock);
2528         spin_lock_init(&enic->enic_api_lock);
2529
2530         /*
2531          * Set ingress vlan rewrite mode before vnic initialization
2532          */
2533
2534         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2535         if (err) {
2536                 dev_err(dev,
2537                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2538                 goto err_out_dev_close;
2539         }
2540
2541         /* Issue device init to initialize the vnic-to-switch link.
2542          * We'll start with carrier off and wait for link UP
2543          * notification later to turn on carrier.  We don't need
2544          * to wait here for the vnic-to-switch link initialization
2545          * to complete; link UP notification is the indication that
2546          * the process is complete.
2547          */
2548
2549         netif_carrier_off(netdev);
2550
2551         /* Do not call dev_init for a dynamic vnic.
2552          * For a dynamic vnic, init_prov_info will be
2553          * called later by an upper layer.
2554          */
2555
2556         if (!enic_is_dynamic(enic)) {
2557                 err = vnic_dev_init(enic->vdev, 0);
2558                 if (err) {
2559                         dev_err(dev, "vNIC dev init failed, aborting\n");
2560                         goto err_out_dev_close;
2561                 }
2562         }
2563
2564         err = enic_dev_init(enic);
2565         if (err) {
2566                 dev_err(dev, "Device initialization failed, aborting\n");
2567                 goto err_out_dev_close;
2568         }
2569
2570         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2571         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2572
2573         /* Setup notification timer, HW reset task, and wq locks
2574          */
2575
2576         init_timer(&enic->notify_timer);
2577         enic->notify_timer.function = enic_notify_timer;
2578         enic->notify_timer.data = (unsigned long)enic;
2579
2580         enic_set_rx_coal_setting(enic);
2581         INIT_WORK(&enic->reset, enic_reset);
2582         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2583
2584         for (i = 0; i < enic->wq_count; i++)
2585                 spin_lock_init(&enic->wq_lock[i]);
2586
2587         /* Register net device
2588          */
2589
2590         enic->port_mtu = enic->config.mtu;
2591         (void)enic_change_mtu(netdev, enic->port_mtu);
2592
2593         err = enic_set_mac_addr(netdev, enic->mac_addr);
2594         if (err) {
2595                 dev_err(dev, "Invalid MAC address, aborting\n");
2596                 goto err_out_dev_deinit;
2597         }
2598
2599         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2600         /* rx coalesce time already got initialized. This gets used
2601          * if adaptive coal is turned off
2602          */
2603         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2604
2605         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2606                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2607         else
2608                 netdev->netdev_ops = &enic_netdev_ops;
2609
2610         netdev->watchdog_timeo = 2 * HZ;
2611         enic_set_ethtool_ops(netdev);
2612
2613         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2614         if (ENIC_SETTING(enic, LOOP)) {
2615                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2616                 enic->loop_enable = 1;
2617                 enic->loop_tag = enic->config.loop_tag;
2618                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2619         }
2620         if (ENIC_SETTING(enic, TXCSUM))
2621                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2622         if (ENIC_SETTING(enic, TSO))
2623                 netdev->hw_features |= NETIF_F_TSO |
2624                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2625         if (ENIC_SETTING(enic, RSS))
2626                 netdev->hw_features |= NETIF_F_RXHASH;
2627         if (ENIC_SETTING(enic, RXCSUM))
2628                 netdev->hw_features |= NETIF_F_RXCSUM;
2629
2630         netdev->features |= netdev->hw_features;
2631
2632 #ifdef CONFIG_RFS_ACCEL
2633         netdev->hw_features |= NETIF_F_NTUPLE;
2634 #endif
2635
2636         if (using_dac)
2637                 netdev->features |= NETIF_F_HIGHDMA;
2638
2639         netdev->priv_flags |= IFF_UNICAST_FLT;
2640
2641         err = register_netdev(netdev);
2642         if (err) {
2643                 dev_err(dev, "Cannot register net device, aborting\n");
2644                 goto err_out_dev_deinit;
2645         }
2646         enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2647
2648         return 0;
2649
2650 err_out_dev_deinit:
2651         enic_dev_deinit(enic);
2652 err_out_dev_close:
2653         vnic_dev_close(enic->vdev);
2654 err_out_disable_sriov:
2655         kfree(enic->pp);
2656 err_out_disable_sriov_pp:
2657 #ifdef CONFIG_PCI_IOV
2658         if (enic_sriov_enabled(enic)) {
2659                 pci_disable_sriov(pdev);
2660                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2661         }
2662 err_out_vnic_unregister:
2663 #endif
2664         vnic_dev_unregister(enic->vdev);
2665 err_out_iounmap:
2666         enic_iounmap(enic);
2667 err_out_release_regions:
2668         pci_release_regions(pdev);
2669 err_out_disable_device:
2670         pci_disable_device(pdev);
2671 err_out_free_netdev:
2672         free_netdev(netdev);
2673
2674         return err;
2675 }
2676
2677 static void enic_remove(struct pci_dev *pdev)
2678 {
2679         struct net_device *netdev = pci_get_drvdata(pdev);
2680
2681         if (netdev) {
2682                 struct enic *enic = netdev_priv(netdev);
2683
2684                 cancel_work_sync(&enic->reset);
2685                 cancel_work_sync(&enic->change_mtu_work);
2686                 unregister_netdev(netdev);
2687                 enic_dev_deinit(enic);
2688                 vnic_dev_close(enic->vdev);
2689 #ifdef CONFIG_PCI_IOV
2690                 if (enic_sriov_enabled(enic)) {
2691                         pci_disable_sriov(pdev);
2692                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2693                 }
2694 #endif
2695                 kfree(enic->pp);
2696                 vnic_dev_unregister(enic->vdev);
2697                 enic_iounmap(enic);
2698                 pci_release_regions(pdev);
2699                 pci_disable_device(pdev);
2700                 free_netdev(netdev);
2701         }
2702 }
2703
2704 static struct pci_driver enic_driver = {
2705         .name = DRV_NAME,
2706         .id_table = enic_id_table,
2707         .probe = enic_probe,
2708         .remove = enic_remove,
2709 };
2710
2711 static int __init enic_init_module(void)
2712 {
2713         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2714
2715         return pci_register_driver(&enic_driver);
2716 }
2717
2718 static void __exit enic_cleanup_module(void)
2719 {
2720         pci_unregister_driver(&enic_driver);
2721 }
2722
2723 module_init(enic_init_module);
2724 module_exit(enic_cleanup_module);