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 void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1153 {
1154         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1155         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1156         u32 timer = cq->tobe_rx_coal_timeval;
1157
1158         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1159                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1160                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1161         }
1162 }
1163
1164 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1165 {
1166         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1167         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1168         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1169         int index;
1170         u32 timer;
1171         u32 range_start;
1172         u32 traffic;
1173         u64 delta;
1174         ktime_t now = ktime_get();
1175
1176         delta = ktime_us_delta(now, cq->prev_ts);
1177         if (delta < ENIC_AIC_TS_BREAK)
1178                 return;
1179         cq->prev_ts = now;
1180
1181         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1182                   pkt_size_counter->small_pkt_bytes_cnt;
1183         /* The table takes Mbps
1184          * traffic *= 8    => bits
1185          * traffic *= (10^6 / delta)    => bps
1186          * traffic /= 10^6     => Mbps
1187          *
1188          * Combining, traffic *= (8 / delta)
1189          */
1190
1191         traffic <<= 3;
1192         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1193
1194         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1195                 if (traffic < mod_table[index].rx_rate)
1196                         break;
1197         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1198                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1199                       rx_coal->small_pkt_range_start :
1200                       rx_coal->large_pkt_range_start;
1201         timer = range_start + ((rx_coal->range_end - range_start) *
1202                                mod_table[index].range_percent / 100);
1203         /* Damping */
1204         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1205
1206         pkt_size_counter->large_pkt_bytes_cnt = 0;
1207         pkt_size_counter->small_pkt_bytes_cnt = 0;
1208 }
1209
1210 static int enic_poll(struct napi_struct *napi, int budget)
1211 {
1212         struct net_device *netdev = napi->dev;
1213         struct enic *enic = netdev_priv(netdev);
1214         unsigned int cq_rq = enic_cq_rq(enic, 0);
1215         unsigned int cq_wq = enic_cq_wq(enic, 0);
1216         unsigned int intr = enic_legacy_io_intr();
1217         unsigned int rq_work_to_do = budget;
1218         unsigned int wq_work_to_do = -1; /* no limit */
1219         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1220         int err;
1221
1222         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1223                                        enic_wq_service, NULL);
1224
1225         if (!enic_poll_lock_napi(&enic->rq[cq_rq])) {
1226                 if (wq_work_done > 0)
1227                         vnic_intr_return_credits(&enic->intr[intr],
1228                                                  wq_work_done,
1229                                                  0 /* dont unmask intr */,
1230                                                  0 /* dont reset intr timer */);
1231                 return budget;
1232         }
1233
1234         if (budget > 0)
1235                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1236                         rq_work_to_do, enic_rq_service, NULL);
1237
1238         /* Accumulate intr event credits for this polling
1239          * cycle.  An intr event is the completion of a
1240          * a WQ or RQ packet.
1241          */
1242
1243         work_done = rq_work_done + wq_work_done;
1244
1245         if (work_done > 0)
1246                 vnic_intr_return_credits(&enic->intr[intr],
1247                         work_done,
1248                         0 /* don't unmask intr */,
1249                         0 /* don't reset intr timer */);
1250
1251         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1252         enic_poll_unlock_napi(&enic->rq[cq_rq], napi);
1253
1254         /* Buffer allocation failed. Stay in polling
1255          * mode so we can try to fill the ring again.
1256          */
1257
1258         if (err)
1259                 rq_work_done = rq_work_to_do;
1260         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1261                 /* Call the function which refreshes the intr coalescing timer
1262                  * value based on the traffic.
1263                  */
1264                 enic_calc_int_moderation(enic, &enic->rq[0]);
1265
1266         if (rq_work_done < rq_work_to_do) {
1267
1268                 /* Some work done, but not enough to stay in polling,
1269                  * exit polling
1270                  */
1271
1272                 napi_complete(napi);
1273                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1274                         enic_set_int_moderation(enic, &enic->rq[0]);
1275                 vnic_intr_unmask(&enic->intr[intr]);
1276         }
1277
1278         return rq_work_done;
1279 }
1280
1281 #ifdef CONFIG_RFS_ACCEL
1282 static void enic_free_rx_cpu_rmap(struct enic *enic)
1283 {
1284         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1285         enic->netdev->rx_cpu_rmap = NULL;
1286 }
1287
1288 static void enic_set_rx_cpu_rmap(struct enic *enic)
1289 {
1290         int i, res;
1291
1292         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1293                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1294                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1295                         return;
1296                 for (i = 0; i < enic->rq_count; i++) {
1297                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1298                                                enic->msix_entry[i].vector);
1299                         if (unlikely(res)) {
1300                                 enic_free_rx_cpu_rmap(enic);
1301                                 return;
1302                         }
1303                 }
1304         }
1305 }
1306
1307 #else
1308
1309 static void enic_free_rx_cpu_rmap(struct enic *enic)
1310 {
1311 }
1312
1313 static void enic_set_rx_cpu_rmap(struct enic *enic)
1314 {
1315 }
1316
1317 #endif /* CONFIG_RFS_ACCEL */
1318
1319 #ifdef CONFIG_NET_RX_BUSY_POLL
1320 static int enic_busy_poll(struct napi_struct *napi)
1321 {
1322         struct net_device *netdev = napi->dev;
1323         struct enic *enic = netdev_priv(netdev);
1324         unsigned int rq = (napi - &enic->napi[0]);
1325         unsigned int cq = enic_cq_rq(enic, rq);
1326         unsigned int intr = enic_msix_rq_intr(enic, rq);
1327         unsigned int work_to_do = -1; /* clean all pkts possible */
1328         unsigned int work_done;
1329
1330         if (!enic_poll_lock_poll(&enic->rq[rq]))
1331                 return LL_FLUSH_BUSY;
1332         work_done = vnic_cq_service(&enic->cq[cq], work_to_do,
1333                                     enic_rq_service, NULL);
1334
1335         if (work_done > 0)
1336                 vnic_intr_return_credits(&enic->intr[intr],
1337                                          work_done, 0, 0);
1338         vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1339         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1340                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1341         enic_poll_unlock_poll(&enic->rq[rq]);
1342
1343         return work_done;
1344 }
1345 #endif /* CONFIG_NET_RX_BUSY_POLL */
1346
1347 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1348 {
1349         struct net_device *netdev = napi->dev;
1350         struct enic *enic = netdev_priv(netdev);
1351         unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1352         struct vnic_wq *wq = &enic->wq[wq_index];
1353         unsigned int cq;
1354         unsigned int intr;
1355         unsigned int wq_work_to_do = -1; /* clean all desc possible */
1356         unsigned int wq_work_done;
1357         unsigned int wq_irq;
1358
1359         wq_irq = wq->index;
1360         cq = enic_cq_wq(enic, wq_irq);
1361         intr = enic_msix_wq_intr(enic, wq_irq);
1362         wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1363                                        enic_wq_service, NULL);
1364
1365         vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1366                                  0 /* don't unmask intr */,
1367                                  1 /* reset intr timer */);
1368         if (!wq_work_done) {
1369                 napi_complete(napi);
1370                 vnic_intr_unmask(&enic->intr[intr]);
1371                 return 0;
1372         }
1373
1374         return budget;
1375 }
1376
1377 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1378 {
1379         struct net_device *netdev = napi->dev;
1380         struct enic *enic = netdev_priv(netdev);
1381         unsigned int rq = (napi - &enic->napi[0]);
1382         unsigned int cq = enic_cq_rq(enic, rq);
1383         unsigned int intr = enic_msix_rq_intr(enic, rq);
1384         unsigned int work_to_do = budget;
1385         unsigned int work_done = 0;
1386         int err;
1387
1388         if (!enic_poll_lock_napi(&enic->rq[rq]))
1389                 return budget;
1390         /* Service RQ
1391          */
1392
1393         if (budget > 0)
1394                 work_done = vnic_cq_service(&enic->cq[cq],
1395                         work_to_do, enic_rq_service, NULL);
1396
1397         /* Return intr event credits for this polling
1398          * cycle.  An intr event is the completion of a
1399          * RQ packet.
1400          */
1401
1402         if (work_done > 0)
1403                 vnic_intr_return_credits(&enic->intr[intr],
1404                         work_done,
1405                         0 /* don't unmask intr */,
1406                         0 /* don't reset intr timer */);
1407
1408         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1409
1410         /* Buffer allocation failed. Stay in polling mode
1411          * so we can try to fill the ring again.
1412          */
1413
1414         if (err)
1415                 work_done = work_to_do;
1416         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1417                 /* Call the function which refreshes the intr coalescing timer
1418                  * value based on the traffic.
1419                  */
1420                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1421
1422         enic_poll_unlock_napi(&enic->rq[rq], napi);
1423         if (work_done < work_to_do) {
1424
1425                 /* Some work done, but not enough to stay in polling,
1426                  * exit polling
1427                  */
1428
1429                 napi_complete(napi);
1430                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1431                         enic_set_int_moderation(enic, &enic->rq[rq]);
1432                 vnic_intr_unmask(&enic->intr[intr]);
1433         }
1434
1435         return work_done;
1436 }
1437
1438 static void enic_notify_timer(unsigned long data)
1439 {
1440         struct enic *enic = (struct enic *)data;
1441
1442         enic_notify_check(enic);
1443
1444         mod_timer(&enic->notify_timer,
1445                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1446 }
1447
1448 static void enic_free_intr(struct enic *enic)
1449 {
1450         struct net_device *netdev = enic->netdev;
1451         unsigned int i;
1452
1453         enic_free_rx_cpu_rmap(enic);
1454         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1455         case VNIC_DEV_INTR_MODE_INTX:
1456                 free_irq(enic->pdev->irq, netdev);
1457                 break;
1458         case VNIC_DEV_INTR_MODE_MSI:
1459                 free_irq(enic->pdev->irq, enic);
1460                 break;
1461         case VNIC_DEV_INTR_MODE_MSIX:
1462                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1463                         if (enic->msix[i].requested)
1464                                 free_irq(enic->msix_entry[i].vector,
1465                                         enic->msix[i].devid);
1466                 break;
1467         default:
1468                 break;
1469         }
1470 }
1471
1472 static int enic_request_intr(struct enic *enic)
1473 {
1474         struct net_device *netdev = enic->netdev;
1475         unsigned int i, intr;
1476         int err = 0;
1477
1478         enic_set_rx_cpu_rmap(enic);
1479         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1480
1481         case VNIC_DEV_INTR_MODE_INTX:
1482
1483                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1484                         IRQF_SHARED, netdev->name, netdev);
1485                 break;
1486
1487         case VNIC_DEV_INTR_MODE_MSI:
1488
1489                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1490                         0, netdev->name, enic);
1491                 break;
1492
1493         case VNIC_DEV_INTR_MODE_MSIX:
1494
1495                 for (i = 0; i < enic->rq_count; i++) {
1496                         intr = enic_msix_rq_intr(enic, i);
1497                         snprintf(enic->msix[intr].devname,
1498                                 sizeof(enic->msix[intr].devname),
1499                                 "%.11s-rx-%d", netdev->name, i);
1500                         enic->msix[intr].isr = enic_isr_msix;
1501                         enic->msix[intr].devid = &enic->napi[i];
1502                 }
1503
1504                 for (i = 0; i < enic->wq_count; i++) {
1505                         int wq = enic_cq_wq(enic, i);
1506
1507                         intr = enic_msix_wq_intr(enic, i);
1508                         snprintf(enic->msix[intr].devname,
1509                                 sizeof(enic->msix[intr].devname),
1510                                 "%.11s-tx-%d", netdev->name, i);
1511                         enic->msix[intr].isr = enic_isr_msix;
1512                         enic->msix[intr].devid = &enic->napi[wq];
1513                 }
1514
1515                 intr = enic_msix_err_intr(enic);
1516                 snprintf(enic->msix[intr].devname,
1517                         sizeof(enic->msix[intr].devname),
1518                         "%.11s-err", netdev->name);
1519                 enic->msix[intr].isr = enic_isr_msix_err;
1520                 enic->msix[intr].devid = enic;
1521
1522                 intr = enic_msix_notify_intr(enic);
1523                 snprintf(enic->msix[intr].devname,
1524                         sizeof(enic->msix[intr].devname),
1525                         "%.11s-notify", netdev->name);
1526                 enic->msix[intr].isr = enic_isr_msix_notify;
1527                 enic->msix[intr].devid = enic;
1528
1529                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1530                         enic->msix[i].requested = 0;
1531
1532                 for (i = 0; i < enic->intr_count; i++) {
1533                         err = request_irq(enic->msix_entry[i].vector,
1534                                 enic->msix[i].isr, 0,
1535                                 enic->msix[i].devname,
1536                                 enic->msix[i].devid);
1537                         if (err) {
1538                                 enic_free_intr(enic);
1539                                 break;
1540                         }
1541                         enic->msix[i].requested = 1;
1542                 }
1543
1544                 break;
1545
1546         default:
1547                 break;
1548         }
1549
1550         return err;
1551 }
1552
1553 static void enic_synchronize_irqs(struct enic *enic)
1554 {
1555         unsigned int i;
1556
1557         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1558         case VNIC_DEV_INTR_MODE_INTX:
1559         case VNIC_DEV_INTR_MODE_MSI:
1560                 synchronize_irq(enic->pdev->irq);
1561                 break;
1562         case VNIC_DEV_INTR_MODE_MSIX:
1563                 for (i = 0; i < enic->intr_count; i++)
1564                         synchronize_irq(enic->msix_entry[i].vector);
1565                 break;
1566         default:
1567                 break;
1568         }
1569 }
1570
1571 static void enic_set_rx_coal_setting(struct enic *enic)
1572 {
1573         unsigned int speed;
1574         int index = -1;
1575         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1576
1577         /* 1. Read the link speed from fw
1578          * 2. Pick the default range for the speed
1579          * 3. Update it in enic->rx_coalesce_setting
1580          */
1581         speed = vnic_dev_port_speed(enic->vdev);
1582         if (ENIC_LINK_SPEED_10G < speed)
1583                 index = ENIC_LINK_40G_INDEX;
1584         else if (ENIC_LINK_SPEED_4G < speed)
1585                 index = ENIC_LINK_10G_INDEX;
1586         else
1587                 index = ENIC_LINK_4G_INDEX;
1588
1589         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1590         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1591         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1592
1593         /* Start with the value provided by UCSM */
1594         for (index = 0; index < enic->rq_count; index++)
1595                 enic->cq[index].cur_rx_coal_timeval =
1596                                 enic->config.intr_timer_usec;
1597
1598         rx_coal->use_adaptive_rx_coalesce = 1;
1599 }
1600
1601 static int enic_dev_notify_set(struct enic *enic)
1602 {
1603         int err;
1604
1605         spin_lock_bh(&enic->devcmd_lock);
1606         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1607         case VNIC_DEV_INTR_MODE_INTX:
1608                 err = vnic_dev_notify_set(enic->vdev,
1609                         enic_legacy_notify_intr());
1610                 break;
1611         case VNIC_DEV_INTR_MODE_MSIX:
1612                 err = vnic_dev_notify_set(enic->vdev,
1613                         enic_msix_notify_intr(enic));
1614                 break;
1615         default:
1616                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1617                 break;
1618         }
1619         spin_unlock_bh(&enic->devcmd_lock);
1620
1621         return err;
1622 }
1623
1624 static void enic_notify_timer_start(struct enic *enic)
1625 {
1626         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1627         case VNIC_DEV_INTR_MODE_MSI:
1628                 mod_timer(&enic->notify_timer, jiffies);
1629                 break;
1630         default:
1631                 /* Using intr for notification for INTx/MSI-X */
1632                 break;
1633         }
1634 }
1635
1636 /* rtnl lock is held, process context */
1637 static int enic_open(struct net_device *netdev)
1638 {
1639         struct enic *enic = netdev_priv(netdev);
1640         unsigned int i;
1641         int err;
1642
1643         err = enic_request_intr(enic);
1644         if (err) {
1645                 netdev_err(netdev, "Unable to request irq.\n");
1646                 return err;
1647         }
1648
1649         err = enic_dev_notify_set(enic);
1650         if (err) {
1651                 netdev_err(netdev,
1652                         "Failed to alloc notify buffer, aborting.\n");
1653                 goto err_out_free_intr;
1654         }
1655
1656         for (i = 0; i < enic->rq_count; i++) {
1657                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1658                 /* Need at least one buffer on ring to get going */
1659                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1660                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1661                         err = -ENOMEM;
1662                         goto err_out_free_rq;
1663                 }
1664         }
1665
1666         for (i = 0; i < enic->wq_count; i++)
1667                 vnic_wq_enable(&enic->wq[i]);
1668         for (i = 0; i < enic->rq_count; i++)
1669                 vnic_rq_enable(&enic->rq[i]);
1670
1671         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1672                 enic_dev_add_station_addr(enic);
1673
1674         enic_set_rx_mode(netdev);
1675
1676         netif_tx_wake_all_queues(netdev);
1677
1678         for (i = 0; i < enic->rq_count; i++) {
1679                 enic_busy_poll_init_lock(&enic->rq[i]);
1680                 napi_enable(&enic->napi[i]);
1681         }
1682         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1683                 for (i = 0; i < enic->wq_count; i++)
1684                         napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1685         enic_dev_enable(enic);
1686
1687         for (i = 0; i < enic->intr_count; i++)
1688                 vnic_intr_unmask(&enic->intr[i]);
1689
1690         enic_notify_timer_start(enic);
1691         enic_rfs_flw_tbl_init(enic);
1692
1693         return 0;
1694
1695 err_out_free_rq:
1696         for (i = 0; i < enic->rq_count; i++)
1697                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1698         enic_dev_notify_unset(enic);
1699 err_out_free_intr:
1700         enic_free_intr(enic);
1701
1702         return err;
1703 }
1704
1705 /* rtnl lock is held, process context */
1706 static int enic_stop(struct net_device *netdev)
1707 {
1708         struct enic *enic = netdev_priv(netdev);
1709         unsigned int i;
1710         int err;
1711
1712         for (i = 0; i < enic->intr_count; i++) {
1713                 vnic_intr_mask(&enic->intr[i]);
1714                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1715         }
1716
1717         enic_synchronize_irqs(enic);
1718
1719         del_timer_sync(&enic->notify_timer);
1720         enic_rfs_flw_tbl_free(enic);
1721
1722         enic_dev_disable(enic);
1723
1724         for (i = 0; i < enic->rq_count; i++) {
1725                 napi_disable(&enic->napi[i]);
1726                 local_bh_disable();
1727                 while (!enic_poll_lock_napi(&enic->rq[i]))
1728                         mdelay(1);
1729                 local_bh_enable();
1730         }
1731
1732         netif_carrier_off(netdev);
1733         netif_tx_disable(netdev);
1734         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1735                 for (i = 0; i < enic->wq_count; i++)
1736                         napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1737
1738         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1739                 enic_dev_del_station_addr(enic);
1740
1741         for (i = 0; i < enic->wq_count; i++) {
1742                 err = vnic_wq_disable(&enic->wq[i]);
1743                 if (err)
1744                         return err;
1745         }
1746         for (i = 0; i < enic->rq_count; i++) {
1747                 err = vnic_rq_disable(&enic->rq[i]);
1748                 if (err)
1749                         return err;
1750         }
1751
1752         enic_dev_notify_unset(enic);
1753         enic_free_intr(enic);
1754
1755         for (i = 0; i < enic->wq_count; i++)
1756                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1757         for (i = 0; i < enic->rq_count; i++)
1758                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1759         for (i = 0; i < enic->cq_count; i++)
1760                 vnic_cq_clean(&enic->cq[i]);
1761         for (i = 0; i < enic->intr_count; i++)
1762                 vnic_intr_clean(&enic->intr[i]);
1763
1764         return 0;
1765 }
1766
1767 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1768 {
1769         struct enic *enic = netdev_priv(netdev);
1770         int running = netif_running(netdev);
1771
1772         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1773                 return -EINVAL;
1774
1775         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1776                 return -EOPNOTSUPP;
1777
1778         if (running)
1779                 enic_stop(netdev);
1780
1781         netdev->mtu = new_mtu;
1782
1783         if (netdev->mtu > enic->port_mtu)
1784                 netdev_warn(netdev,
1785                         "interface MTU (%d) set higher than port MTU (%d)\n",
1786                         netdev->mtu, enic->port_mtu);
1787
1788         if (running)
1789                 enic_open(netdev);
1790
1791         return 0;
1792 }
1793
1794 static void enic_change_mtu_work(struct work_struct *work)
1795 {
1796         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1797         struct net_device *netdev = enic->netdev;
1798         int new_mtu = vnic_dev_mtu(enic->vdev);
1799         int err;
1800         unsigned int i;
1801
1802         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1803
1804         rtnl_lock();
1805
1806         /* Stop RQ */
1807         del_timer_sync(&enic->notify_timer);
1808
1809         for (i = 0; i < enic->rq_count; i++)
1810                 napi_disable(&enic->napi[i]);
1811
1812         vnic_intr_mask(&enic->intr[0]);
1813         enic_synchronize_irqs(enic);
1814         err = vnic_rq_disable(&enic->rq[0]);
1815         if (err) {
1816                 rtnl_unlock();
1817                 netdev_err(netdev, "Unable to disable RQ.\n");
1818                 return;
1819         }
1820         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1821         vnic_cq_clean(&enic->cq[0]);
1822         vnic_intr_clean(&enic->intr[0]);
1823
1824         /* Fill RQ with new_mtu-sized buffers */
1825         netdev->mtu = new_mtu;
1826         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1827         /* Need at least one buffer on ring to get going */
1828         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1829                 rtnl_unlock();
1830                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1831                 return;
1832         }
1833
1834         /* Start RQ */
1835         vnic_rq_enable(&enic->rq[0]);
1836         napi_enable(&enic->napi[0]);
1837         vnic_intr_unmask(&enic->intr[0]);
1838         enic_notify_timer_start(enic);
1839
1840         rtnl_unlock();
1841
1842         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1843 }
1844
1845 #ifdef CONFIG_NET_POLL_CONTROLLER
1846 static void enic_poll_controller(struct net_device *netdev)
1847 {
1848         struct enic *enic = netdev_priv(netdev);
1849         struct vnic_dev *vdev = enic->vdev;
1850         unsigned int i, intr;
1851
1852         switch (vnic_dev_get_intr_mode(vdev)) {
1853         case VNIC_DEV_INTR_MODE_MSIX:
1854                 for (i = 0; i < enic->rq_count; i++) {
1855                         intr = enic_msix_rq_intr(enic, i);
1856                         enic_isr_msix(enic->msix_entry[intr].vector,
1857                                       &enic->napi[i]);
1858                 }
1859
1860                 for (i = 0; i < enic->wq_count; i++) {
1861                         intr = enic_msix_wq_intr(enic, i);
1862                         enic_isr_msix(enic->msix_entry[intr].vector,
1863                                       &enic->napi[enic_cq_wq(enic, i)]);
1864                 }
1865
1866                 break;
1867         case VNIC_DEV_INTR_MODE_MSI:
1868                 enic_isr_msi(enic->pdev->irq, enic);
1869                 break;
1870         case VNIC_DEV_INTR_MODE_INTX:
1871                 enic_isr_legacy(enic->pdev->irq, netdev);
1872                 break;
1873         default:
1874                 break;
1875         }
1876 }
1877 #endif
1878
1879 static int enic_dev_wait(struct vnic_dev *vdev,
1880         int (*start)(struct vnic_dev *, int),
1881         int (*finished)(struct vnic_dev *, int *),
1882         int arg)
1883 {
1884         unsigned long time;
1885         int done;
1886         int err;
1887
1888         BUG_ON(in_interrupt());
1889
1890         err = start(vdev, arg);
1891         if (err)
1892                 return err;
1893
1894         /* Wait for func to complete...2 seconds max
1895          */
1896
1897         time = jiffies + (HZ * 2);
1898         do {
1899
1900                 err = finished(vdev, &done);
1901                 if (err)
1902                         return err;
1903
1904                 if (done)
1905                         return 0;
1906
1907                 schedule_timeout_uninterruptible(HZ / 10);
1908
1909         } while (time_after(time, jiffies));
1910
1911         return -ETIMEDOUT;
1912 }
1913
1914 static int enic_dev_open(struct enic *enic)
1915 {
1916         int err;
1917
1918         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1919                 vnic_dev_open_done, 0);
1920         if (err)
1921                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1922                         err);
1923
1924         return err;
1925 }
1926
1927 static int enic_dev_hang_reset(struct enic *enic)
1928 {
1929         int err;
1930
1931         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1932                 vnic_dev_hang_reset_done, 0);
1933         if (err)
1934                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1935                         err);
1936
1937         return err;
1938 }
1939
1940 int __enic_set_rsskey(struct enic *enic)
1941 {
1942         union vnic_rss_key *rss_key_buf_va;
1943         dma_addr_t rss_key_buf_pa;
1944         int i, kidx, bidx, err;
1945
1946         rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
1947                                                sizeof(union vnic_rss_key),
1948                                                &rss_key_buf_pa);
1949         if (!rss_key_buf_va)
1950                 return -ENOMEM;
1951
1952         for (i = 0; i < ENIC_RSS_LEN; i++) {
1953                 kidx = i / ENIC_RSS_BYTES_PER_KEY;
1954                 bidx = i % ENIC_RSS_BYTES_PER_KEY;
1955                 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
1956         }
1957         spin_lock_bh(&enic->devcmd_lock);
1958         err = enic_set_rss_key(enic,
1959                 rss_key_buf_pa,
1960                 sizeof(union vnic_rss_key));
1961         spin_unlock_bh(&enic->devcmd_lock);
1962
1963         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1964                 rss_key_buf_va, rss_key_buf_pa);
1965
1966         return err;
1967 }
1968
1969 static int enic_set_rsskey(struct enic *enic)
1970 {
1971         netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
1972
1973         return __enic_set_rsskey(enic);
1974 }
1975
1976 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1977 {
1978         dma_addr_t rss_cpu_buf_pa;
1979         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1980         unsigned int i;
1981         int err;
1982
1983         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1984                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1985         if (!rss_cpu_buf_va)
1986                 return -ENOMEM;
1987
1988         for (i = 0; i < (1 << rss_hash_bits); i++)
1989                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1990
1991         spin_lock_bh(&enic->devcmd_lock);
1992         err = enic_set_rss_cpu(enic,
1993                 rss_cpu_buf_pa,
1994                 sizeof(union vnic_rss_cpu));
1995         spin_unlock_bh(&enic->devcmd_lock);
1996
1997         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1998                 rss_cpu_buf_va, rss_cpu_buf_pa);
1999
2000         return err;
2001 }
2002
2003 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2004         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2005 {
2006         const u8 tso_ipid_split_en = 0;
2007         const u8 ig_vlan_strip_en = 1;
2008         int err;
2009
2010         /* Enable VLAN tag stripping.
2011         */
2012
2013         spin_lock_bh(&enic->devcmd_lock);
2014         err = enic_set_nic_cfg(enic,
2015                 rss_default_cpu, rss_hash_type,
2016                 rss_hash_bits, rss_base_cpu,
2017                 rss_enable, tso_ipid_split_en,
2018                 ig_vlan_strip_en);
2019         spin_unlock_bh(&enic->devcmd_lock);
2020
2021         return err;
2022 }
2023
2024 static int enic_set_rss_nic_cfg(struct enic *enic)
2025 {
2026         struct device *dev = enic_get_dev(enic);
2027         const u8 rss_default_cpu = 0;
2028         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
2029                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
2030                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
2031                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2032         const u8 rss_hash_bits = 7;
2033         const u8 rss_base_cpu = 0;
2034         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2035
2036         if (rss_enable) {
2037                 if (!enic_set_rsskey(enic)) {
2038                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
2039                                 rss_enable = 0;
2040                                 dev_warn(dev, "RSS disabled, "
2041                                         "Failed to set RSS cpu indirection table.");
2042                         }
2043                 } else {
2044                         rss_enable = 0;
2045                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2046                 }
2047         }
2048
2049         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2050                 rss_hash_bits, rss_base_cpu, rss_enable);
2051 }
2052
2053 static void enic_reset(struct work_struct *work)
2054 {
2055         struct enic *enic = container_of(work, struct enic, reset);
2056
2057         if (!netif_running(enic->netdev))
2058                 return;
2059
2060         rtnl_lock();
2061
2062         spin_lock(&enic->enic_api_lock);
2063         enic_dev_hang_notify(enic);
2064         enic_stop(enic->netdev);
2065         enic_dev_hang_reset(enic);
2066         enic_reset_addr_lists(enic);
2067         enic_init_vnic_resources(enic);
2068         enic_set_rss_nic_cfg(enic);
2069         enic_dev_set_ig_vlan_rewrite_mode(enic);
2070         enic_open(enic->netdev);
2071         spin_unlock(&enic->enic_api_lock);
2072         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2073
2074         rtnl_unlock();
2075 }
2076
2077 static int enic_set_intr_mode(struct enic *enic)
2078 {
2079         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2080         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2081         unsigned int i;
2082
2083         /* Set interrupt mode (INTx, MSI, MSI-X) depending
2084          * on system capabilities.
2085          *
2086          * Try MSI-X first
2087          *
2088          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2089          * (the second to last INTR is used for WQ/RQ errors)
2090          * (the last INTR is used for notifications)
2091          */
2092
2093         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2094         for (i = 0; i < n + m + 2; i++)
2095                 enic->msix_entry[i].entry = i;
2096
2097         /* Use multiple RQs if RSS is enabled
2098          */
2099
2100         if (ENIC_SETTING(enic, RSS) &&
2101             enic->config.intr_mode < 1 &&
2102             enic->rq_count >= n &&
2103             enic->wq_count >= m &&
2104             enic->cq_count >= n + m &&
2105             enic->intr_count >= n + m + 2) {
2106
2107                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2108                                           n + m + 2, n + m + 2) > 0) {
2109
2110                         enic->rq_count = n;
2111                         enic->wq_count = m;
2112                         enic->cq_count = n + m;
2113                         enic->intr_count = n + m + 2;
2114
2115                         vnic_dev_set_intr_mode(enic->vdev,
2116                                 VNIC_DEV_INTR_MODE_MSIX);
2117
2118                         return 0;
2119                 }
2120         }
2121
2122         if (enic->config.intr_mode < 1 &&
2123             enic->rq_count >= 1 &&
2124             enic->wq_count >= m &&
2125             enic->cq_count >= 1 + m &&
2126             enic->intr_count >= 1 + m + 2) {
2127                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2128                                           1 + m + 2, 1 + m + 2) > 0) {
2129
2130                         enic->rq_count = 1;
2131                         enic->wq_count = m;
2132                         enic->cq_count = 1 + m;
2133                         enic->intr_count = 1 + m + 2;
2134
2135                         vnic_dev_set_intr_mode(enic->vdev,
2136                                 VNIC_DEV_INTR_MODE_MSIX);
2137
2138                         return 0;
2139                 }
2140         }
2141
2142         /* Next try MSI
2143          *
2144          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2145          */
2146
2147         if (enic->config.intr_mode < 2 &&
2148             enic->rq_count >= 1 &&
2149             enic->wq_count >= 1 &&
2150             enic->cq_count >= 2 &&
2151             enic->intr_count >= 1 &&
2152             !pci_enable_msi(enic->pdev)) {
2153
2154                 enic->rq_count = 1;
2155                 enic->wq_count = 1;
2156                 enic->cq_count = 2;
2157                 enic->intr_count = 1;
2158
2159                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2160
2161                 return 0;
2162         }
2163
2164         /* Next try INTx
2165          *
2166          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2167          * (the first INTR is used for WQ/RQ)
2168          * (the second INTR is used for WQ/RQ errors)
2169          * (the last INTR is used for notifications)
2170          */
2171
2172         if (enic->config.intr_mode < 3 &&
2173             enic->rq_count >= 1 &&
2174             enic->wq_count >= 1 &&
2175             enic->cq_count >= 2 &&
2176             enic->intr_count >= 3) {
2177
2178                 enic->rq_count = 1;
2179                 enic->wq_count = 1;
2180                 enic->cq_count = 2;
2181                 enic->intr_count = 3;
2182
2183                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2184
2185                 return 0;
2186         }
2187
2188         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2189
2190         return -EINVAL;
2191 }
2192
2193 static void enic_clear_intr_mode(struct enic *enic)
2194 {
2195         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2196         case VNIC_DEV_INTR_MODE_MSIX:
2197                 pci_disable_msix(enic->pdev);
2198                 break;
2199         case VNIC_DEV_INTR_MODE_MSI:
2200                 pci_disable_msi(enic->pdev);
2201                 break;
2202         default:
2203                 break;
2204         }
2205
2206         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2207 }
2208
2209 static const struct net_device_ops enic_netdev_dynamic_ops = {
2210         .ndo_open               = enic_open,
2211         .ndo_stop               = enic_stop,
2212         .ndo_start_xmit         = enic_hard_start_xmit,
2213         .ndo_get_stats64        = enic_get_stats,
2214         .ndo_validate_addr      = eth_validate_addr,
2215         .ndo_set_rx_mode        = enic_set_rx_mode,
2216         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2217         .ndo_change_mtu         = enic_change_mtu,
2218         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2219         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2220         .ndo_tx_timeout         = enic_tx_timeout,
2221         .ndo_set_vf_port        = enic_set_vf_port,
2222         .ndo_get_vf_port        = enic_get_vf_port,
2223         .ndo_set_vf_mac         = enic_set_vf_mac,
2224 #ifdef CONFIG_NET_POLL_CONTROLLER
2225         .ndo_poll_controller    = enic_poll_controller,
2226 #endif
2227 #ifdef CONFIG_RFS_ACCEL
2228         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2229 #endif
2230 #ifdef CONFIG_NET_RX_BUSY_POLL
2231         .ndo_busy_poll          = enic_busy_poll,
2232 #endif
2233 };
2234
2235 static const struct net_device_ops enic_netdev_ops = {
2236         .ndo_open               = enic_open,
2237         .ndo_stop               = enic_stop,
2238         .ndo_start_xmit         = enic_hard_start_xmit,
2239         .ndo_get_stats64        = enic_get_stats,
2240         .ndo_validate_addr      = eth_validate_addr,
2241         .ndo_set_mac_address    = enic_set_mac_address,
2242         .ndo_set_rx_mode        = enic_set_rx_mode,
2243         .ndo_change_mtu         = enic_change_mtu,
2244         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2245         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2246         .ndo_tx_timeout         = enic_tx_timeout,
2247         .ndo_set_vf_port        = enic_set_vf_port,
2248         .ndo_get_vf_port        = enic_get_vf_port,
2249         .ndo_set_vf_mac         = enic_set_vf_mac,
2250 #ifdef CONFIG_NET_POLL_CONTROLLER
2251         .ndo_poll_controller    = enic_poll_controller,
2252 #endif
2253 #ifdef CONFIG_RFS_ACCEL
2254         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2255 #endif
2256 #ifdef CONFIG_NET_RX_BUSY_POLL
2257         .ndo_busy_poll          = enic_busy_poll,
2258 #endif
2259 };
2260
2261 static void enic_dev_deinit(struct enic *enic)
2262 {
2263         unsigned int i;
2264
2265         for (i = 0; i < enic->rq_count; i++) {
2266                 napi_hash_del(&enic->napi[i]);
2267                 netif_napi_del(&enic->napi[i]);
2268         }
2269         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2270                 for (i = 0; i < enic->wq_count; i++)
2271                         netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2272
2273         enic_free_vnic_resources(enic);
2274         enic_clear_intr_mode(enic);
2275 }
2276
2277 static void enic_kdump_kernel_config(struct enic *enic)
2278 {
2279         if (is_kdump_kernel()) {
2280                 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2281                 enic->rq_count = 1;
2282                 enic->wq_count = 1;
2283                 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2284                 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2285                 enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2286         }
2287 }
2288
2289 static int enic_dev_init(struct enic *enic)
2290 {
2291         struct device *dev = enic_get_dev(enic);
2292         struct net_device *netdev = enic->netdev;
2293         unsigned int i;
2294         int err;
2295
2296         /* Get interrupt coalesce timer info */
2297         err = enic_dev_intr_coal_timer_info(enic);
2298         if (err) {
2299                 dev_warn(dev, "Using default conversion factor for "
2300                         "interrupt coalesce timer\n");
2301                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2302         }
2303
2304         /* Get vNIC configuration
2305          */
2306
2307         err = enic_get_vnic_config(enic);
2308         if (err) {
2309                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2310                 return err;
2311         }
2312
2313         /* Get available resource counts
2314          */
2315
2316         enic_get_res_counts(enic);
2317
2318         /* modify resource count if we are in kdump_kernel
2319          */
2320         enic_kdump_kernel_config(enic);
2321
2322         /* Set interrupt mode based on resource counts and system
2323          * capabilities
2324          */
2325
2326         err = enic_set_intr_mode(enic);
2327         if (err) {
2328                 dev_err(dev, "Failed to set intr mode based on resource "
2329                         "counts and system capabilities, aborting\n");
2330                 return err;
2331         }
2332
2333         /* Allocate and configure vNIC resources
2334          */
2335
2336         err = enic_alloc_vnic_resources(enic);
2337         if (err) {
2338                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2339                 goto err_out_free_vnic_resources;
2340         }
2341
2342         enic_init_vnic_resources(enic);
2343
2344         err = enic_set_rss_nic_cfg(enic);
2345         if (err) {
2346                 dev_err(dev, "Failed to config nic, aborting\n");
2347                 goto err_out_free_vnic_resources;
2348         }
2349
2350         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2351         default:
2352                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2353                 napi_hash_add(&enic->napi[0]);
2354                 break;
2355         case VNIC_DEV_INTR_MODE_MSIX:
2356                 for (i = 0; i < enic->rq_count; i++) {
2357                         netif_napi_add(netdev, &enic->napi[i],
2358                                 enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2359                         napi_hash_add(&enic->napi[i]);
2360                 }
2361                 for (i = 0; i < enic->wq_count; i++)
2362                         netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2363                                        enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2364                 break;
2365         }
2366
2367         return 0;
2368
2369 err_out_free_vnic_resources:
2370         enic_clear_intr_mode(enic);
2371         enic_free_vnic_resources(enic);
2372
2373         return err;
2374 }
2375
2376 static void enic_iounmap(struct enic *enic)
2377 {
2378         unsigned int i;
2379
2380         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2381                 if (enic->bar[i].vaddr)
2382                         iounmap(enic->bar[i].vaddr);
2383 }
2384
2385 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2386 {
2387         struct device *dev = &pdev->dev;
2388         struct net_device *netdev;
2389         struct enic *enic;
2390         int using_dac = 0;
2391         unsigned int i;
2392         int err;
2393 #ifdef CONFIG_PCI_IOV
2394         int pos = 0;
2395 #endif
2396         int num_pps = 1;
2397
2398         /* Allocate net device structure and initialize.  Private
2399          * instance data is initialized to zero.
2400          */
2401
2402         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2403                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2404         if (!netdev)
2405                 return -ENOMEM;
2406
2407         pci_set_drvdata(pdev, netdev);
2408
2409         SET_NETDEV_DEV(netdev, &pdev->dev);
2410
2411         enic = netdev_priv(netdev);
2412         enic->netdev = netdev;
2413         enic->pdev = pdev;
2414
2415         /* Setup PCI resources
2416          */
2417
2418         err = pci_enable_device_mem(pdev);
2419         if (err) {
2420                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2421                 goto err_out_free_netdev;
2422         }
2423
2424         err = pci_request_regions(pdev, DRV_NAME);
2425         if (err) {
2426                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2427                 goto err_out_disable_device;
2428         }
2429
2430         pci_set_master(pdev);
2431
2432         /* Query PCI controller on system for DMA addressing
2433          * limitation for the device.  Try 64-bit first, and
2434          * fail to 32-bit.
2435          */
2436
2437         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2438         if (err) {
2439                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2440                 if (err) {
2441                         dev_err(dev, "No usable DMA configuration, aborting\n");
2442                         goto err_out_release_regions;
2443                 }
2444                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2445                 if (err) {
2446                         dev_err(dev, "Unable to obtain %u-bit DMA "
2447                                 "for consistent allocations, aborting\n", 32);
2448                         goto err_out_release_regions;
2449                 }
2450         } else {
2451                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2452                 if (err) {
2453                         dev_err(dev, "Unable to obtain %u-bit DMA "
2454                                 "for consistent allocations, aborting\n", 64);
2455                         goto err_out_release_regions;
2456                 }
2457                 using_dac = 1;
2458         }
2459
2460         /* Map vNIC resources from BAR0-5
2461          */
2462
2463         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2464                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2465                         continue;
2466                 enic->bar[i].len = pci_resource_len(pdev, i);
2467                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2468                 if (!enic->bar[i].vaddr) {
2469                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2470                         err = -ENODEV;
2471                         goto err_out_iounmap;
2472                 }
2473                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2474         }
2475
2476         /* Register vNIC device
2477          */
2478
2479         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2480                 ARRAY_SIZE(enic->bar));
2481         if (!enic->vdev) {
2482                 dev_err(dev, "vNIC registration failed, aborting\n");
2483                 err = -ENODEV;
2484                 goto err_out_iounmap;
2485         }
2486
2487         err = vnic_devcmd_init(enic->vdev);
2488
2489         if (err)
2490                 goto err_out_vnic_unregister;
2491
2492 #ifdef CONFIG_PCI_IOV
2493         /* Get number of subvnics */
2494         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2495         if (pos) {
2496                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2497                         &enic->num_vfs);
2498                 if (enic->num_vfs) {
2499                         err = pci_enable_sriov(pdev, enic->num_vfs);
2500                         if (err) {
2501                                 dev_err(dev, "SRIOV enable failed, aborting."
2502                                         " pci_enable_sriov() returned %d\n",
2503                                         err);
2504                                 goto err_out_vnic_unregister;
2505                         }
2506                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2507                         num_pps = enic->num_vfs;
2508                 }
2509         }
2510 #endif
2511
2512         /* Allocate structure for port profiles */
2513         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2514         if (!enic->pp) {
2515                 err = -ENOMEM;
2516                 goto err_out_disable_sriov_pp;
2517         }
2518
2519         /* Issue device open to get device in known state
2520          */
2521
2522         err = enic_dev_open(enic);
2523         if (err) {
2524                 dev_err(dev, "vNIC dev open failed, aborting\n");
2525                 goto err_out_disable_sriov;
2526         }
2527
2528         /* Setup devcmd lock
2529          */
2530
2531         spin_lock_init(&enic->devcmd_lock);
2532         spin_lock_init(&enic->enic_api_lock);
2533
2534         /*
2535          * Set ingress vlan rewrite mode before vnic initialization
2536          */
2537
2538         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2539         if (err) {
2540                 dev_err(dev,
2541                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2542                 goto err_out_dev_close;
2543         }
2544
2545         /* Issue device init to initialize the vnic-to-switch link.
2546          * We'll start with carrier off and wait for link UP
2547          * notification later to turn on carrier.  We don't need
2548          * to wait here for the vnic-to-switch link initialization
2549          * to complete; link UP notification is the indication that
2550          * the process is complete.
2551          */
2552
2553         netif_carrier_off(netdev);
2554
2555         /* Do not call dev_init for a dynamic vnic.
2556          * For a dynamic vnic, init_prov_info will be
2557          * called later by an upper layer.
2558          */
2559
2560         if (!enic_is_dynamic(enic)) {
2561                 err = vnic_dev_init(enic->vdev, 0);
2562                 if (err) {
2563                         dev_err(dev, "vNIC dev init failed, aborting\n");
2564                         goto err_out_dev_close;
2565                 }
2566         }
2567
2568         err = enic_dev_init(enic);
2569         if (err) {
2570                 dev_err(dev, "Device initialization failed, aborting\n");
2571                 goto err_out_dev_close;
2572         }
2573
2574         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2575         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2576
2577         /* Setup notification timer, HW reset task, and wq locks
2578          */
2579
2580         init_timer(&enic->notify_timer);
2581         enic->notify_timer.function = enic_notify_timer;
2582         enic->notify_timer.data = (unsigned long)enic;
2583
2584         enic_set_rx_coal_setting(enic);
2585         INIT_WORK(&enic->reset, enic_reset);
2586         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2587
2588         for (i = 0; i < enic->wq_count; i++)
2589                 spin_lock_init(&enic->wq_lock[i]);
2590
2591         /* Register net device
2592          */
2593
2594         enic->port_mtu = enic->config.mtu;
2595         (void)enic_change_mtu(netdev, enic->port_mtu);
2596
2597         err = enic_set_mac_addr(netdev, enic->mac_addr);
2598         if (err) {
2599                 dev_err(dev, "Invalid MAC address, aborting\n");
2600                 goto err_out_dev_deinit;
2601         }
2602
2603         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2604         /* rx coalesce time already got initialized. This gets used
2605          * if adaptive coal is turned off
2606          */
2607         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2608
2609         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2610                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2611         else
2612                 netdev->netdev_ops = &enic_netdev_ops;
2613
2614         netdev->watchdog_timeo = 2 * HZ;
2615         enic_set_ethtool_ops(netdev);
2616
2617         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2618         if (ENIC_SETTING(enic, LOOP)) {
2619                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2620                 enic->loop_enable = 1;
2621                 enic->loop_tag = enic->config.loop_tag;
2622                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2623         }
2624         if (ENIC_SETTING(enic, TXCSUM))
2625                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2626         if (ENIC_SETTING(enic, TSO))
2627                 netdev->hw_features |= NETIF_F_TSO |
2628                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2629         if (ENIC_SETTING(enic, RSS))
2630                 netdev->hw_features |= NETIF_F_RXHASH;
2631         if (ENIC_SETTING(enic, RXCSUM))
2632                 netdev->hw_features |= NETIF_F_RXCSUM;
2633
2634         netdev->features |= netdev->hw_features;
2635
2636 #ifdef CONFIG_RFS_ACCEL
2637         netdev->hw_features |= NETIF_F_NTUPLE;
2638 #endif
2639
2640         if (using_dac)
2641                 netdev->features |= NETIF_F_HIGHDMA;
2642
2643         netdev->priv_flags |= IFF_UNICAST_FLT;
2644
2645         err = register_netdev(netdev);
2646         if (err) {
2647                 dev_err(dev, "Cannot register net device, aborting\n");
2648                 goto err_out_dev_deinit;
2649         }
2650         enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2651
2652         return 0;
2653
2654 err_out_dev_deinit:
2655         enic_dev_deinit(enic);
2656 err_out_dev_close:
2657         vnic_dev_close(enic->vdev);
2658 err_out_disable_sriov:
2659         kfree(enic->pp);
2660 err_out_disable_sriov_pp:
2661 #ifdef CONFIG_PCI_IOV
2662         if (enic_sriov_enabled(enic)) {
2663                 pci_disable_sriov(pdev);
2664                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2665         }
2666 #endif
2667 err_out_vnic_unregister:
2668         vnic_dev_unregister(enic->vdev);
2669 err_out_iounmap:
2670         enic_iounmap(enic);
2671 err_out_release_regions:
2672         pci_release_regions(pdev);
2673 err_out_disable_device:
2674         pci_disable_device(pdev);
2675 err_out_free_netdev:
2676         free_netdev(netdev);
2677
2678         return err;
2679 }
2680
2681 static void enic_remove(struct pci_dev *pdev)
2682 {
2683         struct net_device *netdev = pci_get_drvdata(pdev);
2684
2685         if (netdev) {
2686                 struct enic *enic = netdev_priv(netdev);
2687
2688                 cancel_work_sync(&enic->reset);
2689                 cancel_work_sync(&enic->change_mtu_work);
2690                 unregister_netdev(netdev);
2691                 enic_dev_deinit(enic);
2692                 vnic_dev_close(enic->vdev);
2693 #ifdef CONFIG_PCI_IOV
2694                 if (enic_sriov_enabled(enic)) {
2695                         pci_disable_sriov(pdev);
2696                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2697                 }
2698 #endif
2699                 kfree(enic->pp);
2700                 vnic_dev_unregister(enic->vdev);
2701                 enic_iounmap(enic);
2702                 pci_release_regions(pdev);
2703                 pci_disable_device(pdev);
2704                 free_netdev(netdev);
2705         }
2706 }
2707
2708 static struct pci_driver enic_driver = {
2709         .name = DRV_NAME,
2710         .id_table = enic_id_table,
2711         .probe = enic_probe,
2712         .remove = enic_remove,
2713 };
2714
2715 static int __init enic_init_module(void)
2716 {
2717         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2718
2719         return pci_register_driver(&enic_driver);
2720 }
2721
2722 static void __exit enic_cleanup_module(void)
2723 {
2724         pci_unregister_driver(&enic_driver);
2725 }
2726
2727 module_init(enic_init_module);
2728 module_exit(enic_cleanup_module);