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
 619         enic_dev_stats_dump(enic, &stats);
 620
 621         net_stats->tx_packets = stats->tx.tx_frames_ok;
 622         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 623         net_stats->tx_errors = stats->tx.tx_errors;
 624         net_stats->tx_dropped = stats->tx.tx_drops;
 625
 626         net_stats->rx_packets = stats->rx.rx_frames_ok;
 627         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 628         net_stats->rx_errors = stats->rx.rx_errors;
 629         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 630         net_stats->rx_over_errors = enic->rq_truncated_pkts;
 631         net_stats->rx_crc_errors = enic->rq_bad_fcs;
 632         net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 633
 634         return net_stats;
 635 }
 636
 637 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 638 {
 639         struct enic *enic = netdev_priv(netdev);
 640
 641         if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 642                 unsigned int mc_count = netdev_mc_count(netdev);
 643
 644                 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 645                             ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 646
 647                 return -ENOSPC;
 648         }
 649
 650         enic_dev_add_addr(enic, mc_addr);
 651         enic->mc_count++;
 652
 653         return 0;
 654 }
 655
 656 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 657 {
 658         struct enic *enic = netdev_priv(netdev);
 659
 660         enic_dev_del_addr(enic, mc_addr);
 661         enic->mc_count--;
 662
 663         return 0;
 664 }
 665
 666 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 667 {
 668         struct enic *enic = netdev_priv(netdev);
 669
 670         if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 671                 unsigned int uc_count = netdev_uc_count(netdev);
 672
 673                 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 674                             ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 675
 676                 return -ENOSPC;
 677         }
 678
 679         enic_dev_add_addr(enic, uc_addr);
 680         enic->uc_count++;
 681
 682         return 0;
 683 }
 684
 685 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 686 {
 687         struct enic *enic = netdev_priv(netdev);
 688
 689         enic_dev_del_addr(enic, uc_addr);
 690         enic->uc_count--;
 691
 692         return 0;
 693 }
 694
 695 void enic_reset_addr_lists(struct enic *enic)
 696 {
 697         struct net_device *netdev = enic->netdev;
 698
 699         __dev_uc_unsync(netdev, NULL);
 700         __dev_mc_unsync(netdev, NULL);
 701
 702         enic->mc_count = 0;
 703         enic->uc_count = 0;
 704         enic->flags = 0;
 705 }
 706
 707 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
 708 {
 709         struct enic *enic = netdev_priv(netdev);
 710
 711         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 712                 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
 713                         return -EADDRNOTAVAIL;
 714         } else {
 715                 if (!is_valid_ether_addr(addr))
 716                         return -EADDRNOTAVAIL;
 717         }
 718
 719         memcpy(netdev->dev_addr, addr, netdev->addr_len);
 720
 721         return 0;
 722 }
 723
 724 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
 725 {
 726         struct enic *enic = netdev_priv(netdev);
 727         struct sockaddr *saddr = p;
 728         char *addr = saddr->sa_data;
 729         int err;
 730
 731         if (netif_running(enic->netdev)) {
 732                 err = enic_dev_del_station_addr(enic);
 733                 if (err)
 734                         return err;
 735         }
 736
 737         err = enic_set_mac_addr(netdev, addr);
 738         if (err)
 739                 return err;
 740
 741         if (netif_running(enic->netdev)) {
 742                 err = enic_dev_add_station_addr(enic);
 743                 if (err)
 744                         return err;
 745         }
 746
 747         return err;
 748 }
 749
 750 static int enic_set_mac_address(struct net_device *netdev, void *p)
 751 {
 752         struct sockaddr *saddr = p;
 753         char *addr = saddr->sa_data;
 754         struct enic *enic = netdev_priv(netdev);
 755         int err;
 756
 757         err = enic_dev_del_station_addr(enic);
 758         if (err)
 759                 return err;
 760
 761         err = enic_set_mac_addr(netdev, addr);
 762         if (err)
 763                 return err;
 764
 765         return enic_dev_add_station_addr(enic);
 766 }
 767
 768 /* netif_tx_lock held, BHs disabled */
 769 static void enic_set_rx_mode(struct net_device *netdev)
 770 {
 771         struct enic *enic = netdev_priv(netdev);
 772         int directed = 1;
 773         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
 774         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
 775         int promisc = (netdev->flags & IFF_PROMISC) ||
 776                 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
 777         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
 778                 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
 779         unsigned int flags = netdev->flags |
 780                 (allmulti ? IFF_ALLMULTI : 0) |
 781                 (promisc ? IFF_PROMISC : 0);
 782
 783         if (enic->flags != flags) {
 784                 enic->flags = flags;
 785                 enic_dev_packet_filter(enic, directed,
 786                         multicast, broadcast, promisc, allmulti);
 787         }
 788
 789         if (!promisc) {
 790                 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
 791                 if (!allmulti)
 792                         __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
 793         }
 794 }
 795
 796 /* netif_tx_lock held, BHs disabled */
 797 static void enic_tx_timeout(struct net_device *netdev)
 798 {
 799         struct enic *enic = netdev_priv(netdev);
 800         schedule_work(&enic->reset);
 801 }
 802
 803 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
 804 {
 805         struct enic *enic = netdev_priv(netdev);
 806         struct enic_port_profile *pp;
 807         int err;
 808
 809         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 810         if (err)
 811                 return err;
 812
 813         if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
 814                 if (vf == PORT_SELF_VF) {
 815                         memcpy(pp->vf_mac, mac, ETH_ALEN);
 816                         return 0;
 817                 } else {
 818                         /*
 819                          * For sriov vf's set the mac in hw
 820                          */
 821                         ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 822                                 vnic_dev_set_mac_addr, mac);
 823                         return enic_dev_status_to_errno(err);
 824                 }
 825         } else
 826                 return -EINVAL;
 827 }
 828
 829 static int enic_set_vf_port(struct net_device *netdev, int vf,
 830         struct nlattr *port[])
 831 {
 832         struct enic *enic = netdev_priv(netdev);
 833         struct enic_port_profile prev_pp;
 834         struct enic_port_profile *pp;
 835         int err = 0, restore_pp = 1;
 836
 837         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 838         if (err)
 839                 return err;
 840
 841         if (!port[IFLA_PORT_REQUEST])
 842                 return -EOPNOTSUPP;
 843
 844         memcpy(&prev_pp, pp, sizeof(*enic->pp));
 845         memset(pp, 0, sizeof(*enic->pp));
 846
 847         pp->set |= ENIC_SET_REQUEST;
 848         pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
 849
 850         if (port[IFLA_PORT_PROFILE]) {
 851                 pp->set |= ENIC_SET_NAME;
 852                 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
 853                         PORT_PROFILE_MAX);
 854         }
 855
 856         if (port[IFLA_PORT_INSTANCE_UUID]) {
 857                 pp->set |= ENIC_SET_INSTANCE;
 858                 memcpy(pp->instance_uuid,
 859                         nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
 860         }
 861
 862         if (port[IFLA_PORT_HOST_UUID]) {
 863                 pp->set |= ENIC_SET_HOST;
 864                 memcpy(pp->host_uuid,
 865                         nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
 866         }
 867
 868         if (vf == PORT_SELF_VF) {
 869                 /* Special case handling: mac came from IFLA_VF_MAC */
 870                 if (!is_zero_ether_addr(prev_pp.vf_mac))
 871                         memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
 872
 873                 if (is_zero_ether_addr(netdev->dev_addr))
 874                         eth_hw_addr_random(netdev);
 875         } else {
 876                 /* SR-IOV VF: get mac from adapter */
 877                 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
 878                         vnic_dev_get_mac_addr, pp->mac_addr);
 879                 if (err) {
 880                         netdev_err(netdev, "Error getting mac for vf %d\n", vf);
 881                         memcpy(pp, &prev_pp, sizeof(*pp));
 882                         return enic_dev_status_to_errno(err);
 883                 }
 884         }
 885
 886         err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
 887         if (err) {
 888                 if (restore_pp) {
 889                         /* Things are still the way they were: Implicit
 890                          * DISASSOCIATE failed
 891                          */
 892                         memcpy(pp, &prev_pp, sizeof(*pp));
 893                 } else {
 894                         memset(pp, 0, sizeof(*pp));
 895                         if (vf == PORT_SELF_VF)
 896                                 eth_zero_addr(netdev->dev_addr);
 897                 }
 898         } else {
 899                 /* Set flag to indicate that the port assoc/disassoc
 900                  * request has been sent out to fw
 901                  */
 902                 pp->set |= ENIC_PORT_REQUEST_APPLIED;
 903
 904                 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
 905                 if (pp->request == PORT_REQUEST_DISASSOCIATE) {
 906                         eth_zero_addr(pp->mac_addr);
 907                         if (vf == PORT_SELF_VF)
 908                                 eth_zero_addr(netdev->dev_addr);
 909                 }
 910         }
 911
 912         if (vf == PORT_SELF_VF)
 913                 eth_zero_addr(pp->vf_mac);
 914
 915         return err;
 916 }
 917
 918 static int enic_get_vf_port(struct net_device *netdev, int vf,
 919         struct sk_buff *skb)
 920 {
 921         struct enic *enic = netdev_priv(netdev);
 922         u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
 923         struct enic_port_profile *pp;
 924         int err;
 925
 926         ENIC_PP_BY_INDEX(enic, vf, pp, &err);
 927         if (err)
 928                 return err;
 929
 930         if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
 931                 return -ENODATA;
 932
 933         err = enic_process_get_pp_request(enic, vf, pp->request, &response);
 934         if (err)
 935                 return err;
 936
 937         if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
 938             nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
 939             ((pp->set & ENIC_SET_NAME) &&
 940              nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
 941             ((pp->set & ENIC_SET_INSTANCE) &&
 942              nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
 943                      pp->instance_uuid)) ||
 944             ((pp->set & ENIC_SET_HOST) &&
 945              nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
 946                 goto nla_put_failure;
 947         return 0;
 948
 949 nla_put_failure:
 950         return -EMSGSIZE;
 951 }
 952
 953 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
 954 {
 955         struct enic *enic = vnic_dev_priv(rq->vdev);
 956
 957         if (!buf->os_buf)
 958                 return;
 959
 960         pci_unmap_single(enic->pdev, buf->dma_addr,
 961                 buf->len, PCI_DMA_FROMDEVICE);
 962         dev_kfree_skb_any(buf->os_buf);
 963         buf->os_buf = NULL;
 964 }
 965
 966 static int enic_rq_alloc_buf(struct vnic_rq *rq)
 967 {
 968         struct enic *enic = vnic_dev_priv(rq->vdev);
 969         struct net_device *netdev = enic->netdev;
 970         struct sk_buff *skb;
 971         unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
 972         unsigned int os_buf_index = 0;
 973         dma_addr_t dma_addr;
 974         struct vnic_rq_buf *buf = rq->to_use;
 975
 976         if (buf->os_buf) {
 977                 enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
 978                                    buf->len);
 979
 980                 return 0;
 981         }
 982         skb = netdev_alloc_skb_ip_align(netdev, len);
 983         if (!skb)
 984                 return -ENOMEM;
 985
 986         dma_addr = pci_map_single(enic->pdev, skb->data, len,
 987                                   PCI_DMA_FROMDEVICE);
 988         if (unlikely(enic_dma_map_check(enic, dma_addr))) {
 989                 dev_kfree_skb(skb);
 990                 return -ENOMEM;
 991         }
 992
 993         enic_queue_rq_desc(rq, skb, os_buf_index,
 994                 dma_addr, len);
 995
 996         return 0;
 997 }
 998
 999 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1000                                       u32 pkt_len)
1001 {
1002         if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1003                 pkt_size->large_pkt_bytes_cnt += pkt_len;
1004         else
1005                 pkt_size->small_pkt_bytes_cnt += pkt_len;
1006 }
1007
1008 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1009                              struct vnic_rq_buf *buf, u16 len)
1010 {
1011         struct enic *enic = netdev_priv(netdev);
1012         struct sk_buff *new_skb;
1013
1014         if (len > enic->rx_copybreak)
1015                 return false;
1016         new_skb = netdev_alloc_skb_ip_align(netdev, len);
1017         if (!new_skb)
1018                 return false;
1019         pci_dma_sync_single_for_cpu(enic->pdev, buf->dma_addr, len,
1020                                     DMA_FROM_DEVICE);
1021         memcpy(new_skb->data, (*skb)->data, len);
1022         *skb = new_skb;
1023
1024         return true;
1025 }
1026
1027 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1028         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1029         int skipped, void *opaque)
1030 {
1031         struct enic *enic = vnic_dev_priv(rq->vdev);
1032         struct net_device *netdev = enic->netdev;
1033         struct sk_buff *skb;
1034         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1035
1036         u8 type, color, eop, sop, ingress_port, vlan_stripped;
1037         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1038         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1039         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1040         u8 packet_error;
1041         u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1042         u32 rss_hash;
1043
1044         if (skipped)
1045                 return;
1046
1047         skb = buf->os_buf;
1048
1049         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1050                 &type, &color, &q_number, &completed_index,
1051                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1052                 &csum_not_calc, &rss_hash, &bytes_written,
1053                 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1054                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1055                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1056                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1057                 &fcs_ok);
1058
1059         if (packet_error) {
1060
1061                 if (!fcs_ok) {
1062                         if (bytes_written > 0)
1063                                 enic->rq_bad_fcs++;
1064                         else if (bytes_written == 0)
1065                                 enic->rq_truncated_pkts++;
1066                 }
1067
1068                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1069                                  PCI_DMA_FROMDEVICE);
1070                 dev_kfree_skb_any(skb);
1071                 buf->os_buf = NULL;
1072
1073                 return;
1074         }
1075
1076         if (eop && bytes_written > 0) {
1077
1078                 /* Good receive
1079                  */
1080
1081                 if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1082                         buf->os_buf = NULL;
1083                         pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1084                                          PCI_DMA_FROMDEVICE);
1085                 }
1086                 prefetch(skb->data - NET_IP_ALIGN);
1087
1088                 skb_put(skb, bytes_written);
1089                 skb->protocol = eth_type_trans(skb, netdev);
1090                 skb_record_rx_queue(skb, q_number);
1091                 if (netdev->features & NETIF_F_RXHASH) {
1092                         skb_set_hash(skb, rss_hash,
1093                                      (rss_type &
1094                                       (NIC_CFG_RSS_HASH_TYPE_TCP_IPV6_EX |
1095                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV6 |
1096                                        NIC_CFG_RSS_HASH_TYPE_TCP_IPV4)) ?
1097                                      PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
1098                 }
1099
1100                 /* Hardware does not provide whole packet checksum. It only
1101                  * provides pseudo checksum. Since hw validates the packet
1102                  * checksum but not provide us the checksum value. use
1103                  * CHECSUM_UNNECESSARY.
1104                  */
1105                 if ((netdev->features & NETIF_F_RXCSUM) && tcp_udp_csum_ok &&
1106                     ipv4_csum_ok)
1107                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1108
1109                 if (vlan_stripped)
1110                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1111
1112                 skb_mark_napi_id(skb, &enic->napi[rq->index]);
1113                 if (enic_poll_busy_polling(rq) ||
1114                     !(netdev->features & NETIF_F_GRO))
1115                         netif_receive_skb(skb);
1116                 else
1117                         napi_gro_receive(&enic->napi[q_number], skb);
1118                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1119                         enic_intr_update_pkt_size(&cq->pkt_size_counter,
1120                                                   bytes_written);
1121         } else {
1122
1123                 /* Buffer overflow
1124                  */
1125
1126                 pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1127                                  PCI_DMA_FROMDEVICE);
1128                 dev_kfree_skb_any(skb);
1129                 buf->os_buf = NULL;
1130         }
1131 }
1132
1133 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1134         u8 type, u16 q_number, u16 completed_index, void *opaque)
1135 {
1136         struct enic *enic = vnic_dev_priv(vdev);
1137
1138         vnic_rq_service(&enic->rq[q_number], cq_desc,
1139                 completed_index, VNIC_RQ_RETURN_DESC,
1140                 enic_rq_indicate_buf, opaque);
1141
1142         return 0;
1143 }
1144
1145 static int enic_poll(struct napi_struct *napi, int budget)
1146 {
1147         struct net_device *netdev = napi->dev;
1148         struct enic *enic = netdev_priv(netdev);
1149         unsigned int cq_rq = enic_cq_rq(enic, 0);
1150         unsigned int cq_wq = enic_cq_wq(enic, 0);
1151         unsigned int intr = enic_legacy_io_intr();
1152         unsigned int rq_work_to_do = budget;
1153         unsigned int wq_work_to_do = -1; /* no limit */
1154         unsigned int  work_done, rq_work_done = 0, wq_work_done;
1155         int err;
1156
1157         wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1158                                        enic_wq_service, NULL);
1159
1160         if (!enic_poll_lock_napi(&enic->rq[cq_rq])) {
1161                 if (wq_work_done > 0)
1162                         vnic_intr_return_credits(&enic->intr[intr],
1163                                                  wq_work_done,
1164                                                  0 /* dont unmask intr */,
1165                                                  0 /* dont reset intr timer */);
1166                 return rq_work_done;
1167         }
1168
1169         if (budget > 0)
1170                 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1171                         rq_work_to_do, enic_rq_service, NULL);
1172
1173         /* Accumulate intr event credits for this polling
1174          * cycle.  An intr event is the completion of a
1175          * a WQ or RQ packet.
1176          */
1177
1178         work_done = rq_work_done + wq_work_done;
1179
1180         if (work_done > 0)
1181                 vnic_intr_return_credits(&enic->intr[intr],
1182                         work_done,
1183                         0 /* don't unmask intr */,
1184                         0 /* don't reset intr timer */);
1185
1186         err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1187
1188         /* Buffer allocation failed. Stay in polling
1189          * mode so we can try to fill the ring again.
1190          */
1191
1192         if (err)
1193                 rq_work_done = rq_work_to_do;
1194
1195         if (rq_work_done < rq_work_to_do) {
1196
1197                 /* Some work done, but not enough to stay in polling,
1198                  * exit polling
1199                  */
1200
1201                 napi_complete(napi);
1202                 vnic_intr_unmask(&enic->intr[intr]);
1203         }
1204         enic_poll_unlock_napi(&enic->rq[cq_rq]);
1205
1206         return rq_work_done;
1207 }
1208
1209 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1210 {
1211         unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1212         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1213         u32 timer = cq->tobe_rx_coal_timeval;
1214
1215         if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1216                 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1217                 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1218         }
1219 }
1220
1221 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1222 {
1223         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1224         struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1225         struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1226         int index;
1227         u32 timer;
1228         u32 range_start;
1229         u32 traffic;
1230         u64 delta;
1231         ktime_t now = ktime_get();
1232
1233         delta = ktime_us_delta(now, cq->prev_ts);
1234         if (delta < ENIC_AIC_TS_BREAK)
1235                 return;
1236         cq->prev_ts = now;
1237
1238         traffic = pkt_size_counter->large_pkt_bytes_cnt +
1239                   pkt_size_counter->small_pkt_bytes_cnt;
1240         /* The table takes Mbps
1241          * traffic *= 8    => bits
1242          * traffic *= (10^6 / delta)    => bps
1243          * traffic /= 10^6     => Mbps
1244          *
1245          * Combining, traffic *= (8 / delta)
1246          */
1247
1248         traffic <<= 3;
1249         traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1250
1251         for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1252                 if (traffic < mod_table[index].rx_rate)
1253                         break;
1254         range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1255                        pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1256                       rx_coal->small_pkt_range_start :
1257                       rx_coal->large_pkt_range_start;
1258         timer = range_start + ((rx_coal->range_end - range_start) *
1259                                mod_table[index].range_percent / 100);
1260         /* Damping */
1261         cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1262
1263         pkt_size_counter->large_pkt_bytes_cnt = 0;
1264         pkt_size_counter->small_pkt_bytes_cnt = 0;
1265 }
1266
1267 #ifdef CONFIG_RFS_ACCEL
1268 static void enic_free_rx_cpu_rmap(struct enic *enic)
1269 {
1270         free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1271         enic->netdev->rx_cpu_rmap = NULL;
1272 }
1273
1274 static void enic_set_rx_cpu_rmap(struct enic *enic)
1275 {
1276         int i, res;
1277
1278         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1279                 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1280                 if (unlikely(!enic->netdev->rx_cpu_rmap))
1281                         return;
1282                 for (i = 0; i < enic->rq_count; i++) {
1283                         res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1284                                                enic->msix_entry[i].vector);
1285                         if (unlikely(res)) {
1286                                 enic_free_rx_cpu_rmap(enic);
1287                                 return;
1288                         }
1289                 }
1290         }
1291 }
1292
1293 #else
1294
1295 static void enic_free_rx_cpu_rmap(struct enic *enic)
1296 {
1297 }
1298
1299 static void enic_set_rx_cpu_rmap(struct enic *enic)
1300 {
1301 }
1302
1303 #endif /* CONFIG_RFS_ACCEL */
1304
1305 #ifdef CONFIG_NET_RX_BUSY_POLL
1306 static int enic_busy_poll(struct napi_struct *napi)
1307 {
1308         struct net_device *netdev = napi->dev;
1309         struct enic *enic = netdev_priv(netdev);
1310         unsigned int rq = (napi - &enic->napi[0]);
1311         unsigned int cq = enic_cq_rq(enic, rq);
1312         unsigned int intr = enic_msix_rq_intr(enic, rq);
1313         unsigned int work_to_do = -1; /* clean all pkts possible */
1314         unsigned int work_done;
1315
1316         if (!enic_poll_lock_poll(&enic->rq[rq]))
1317                 return LL_FLUSH_BUSY;
1318         work_done = vnic_cq_service(&enic->cq[cq], work_to_do,
1319                                     enic_rq_service, NULL);
1320
1321         if (work_done > 0)
1322                 vnic_intr_return_credits(&enic->intr[intr],
1323                                          work_done, 0, 0);
1324         vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1325         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1326                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1327         enic_poll_unlock_poll(&enic->rq[rq]);
1328
1329         return work_done;
1330 }
1331 #endif /* CONFIG_NET_RX_BUSY_POLL */
1332
1333 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1334 {
1335         struct net_device *netdev = napi->dev;
1336         struct enic *enic = netdev_priv(netdev);
1337         unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1338         struct vnic_wq *wq = &enic->wq[wq_index];
1339         unsigned int cq;
1340         unsigned int intr;
1341         unsigned int wq_work_to_do = -1; /* clean all desc possible */
1342         unsigned int wq_work_done;
1343         unsigned int wq_irq;
1344
1345         wq_irq = wq->index;
1346         cq = enic_cq_wq(enic, wq_irq);
1347         intr = enic_msix_wq_intr(enic, wq_irq);
1348         wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1349                                        enic_wq_service, NULL);
1350
1351         vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1352                                  0 /* don't unmask intr */,
1353                                  1 /* reset intr timer */);
1354         if (!wq_work_done) {
1355                 napi_complete(napi);
1356                 vnic_intr_unmask(&enic->intr[intr]);
1357                 return 0;
1358         }
1359
1360         return budget;
1361 }
1362
1363 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1364 {
1365         struct net_device *netdev = napi->dev;
1366         struct enic *enic = netdev_priv(netdev);
1367         unsigned int rq = (napi - &enic->napi[0]);
1368         unsigned int cq = enic_cq_rq(enic, rq);
1369         unsigned int intr = enic_msix_rq_intr(enic, rq);
1370         unsigned int work_to_do = budget;
1371         unsigned int work_done = 0;
1372         int err;
1373
1374         if (!enic_poll_lock_napi(&enic->rq[rq]))
1375                 return budget;
1376         /* Service RQ
1377          */
1378
1379         if (budget > 0)
1380                 work_done = vnic_cq_service(&enic->cq[cq],
1381                         work_to_do, enic_rq_service, NULL);
1382
1383         /* Return intr event credits for this polling
1384          * cycle.  An intr event is the completion of a
1385          * RQ packet.
1386          */
1387
1388         if (work_done > 0)
1389                 vnic_intr_return_credits(&enic->intr[intr],
1390                         work_done,
1391                         0 /* don't unmask intr */,
1392                         0 /* don't reset intr timer */);
1393
1394         err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1395
1396         /* Buffer allocation failed. Stay in polling mode
1397          * so we can try to fill the ring again.
1398          */
1399
1400         if (err)
1401                 work_done = work_to_do;
1402         if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1403                 /* Call the function which refreshes
1404                  * the intr coalescing timer value based on
1405                  * the traffic.  This is supported only in
1406                  * the case of MSI-x mode
1407                  */
1408                 enic_calc_int_moderation(enic, &enic->rq[rq]);
1409
1410         if (work_done < work_to_do) {
1411
1412                 /* Some work done, but not enough to stay in polling,
1413                  * exit polling
1414                  */
1415
1416                 napi_complete(napi);
1417                 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1418                         enic_set_int_moderation(enic, &enic->rq[rq]);
1419                 vnic_intr_unmask(&enic->intr[intr]);
1420         }
1421         enic_poll_unlock_napi(&enic->rq[rq]);
1422
1423         return work_done;
1424 }
1425
1426 static void enic_notify_timer(unsigned long data)
1427 {
1428         struct enic *enic = (struct enic *)data;
1429
1430         enic_notify_check(enic);
1431
1432         mod_timer(&enic->notify_timer,
1433                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1434 }
1435
1436 static void enic_free_intr(struct enic *enic)
1437 {
1438         struct net_device *netdev = enic->netdev;
1439         unsigned int i;
1440
1441         enic_free_rx_cpu_rmap(enic);
1442         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1443         case VNIC_DEV_INTR_MODE_INTX:
1444                 free_irq(enic->pdev->irq, netdev);
1445                 break;
1446         case VNIC_DEV_INTR_MODE_MSI:
1447                 free_irq(enic->pdev->irq, enic);
1448                 break;
1449         case VNIC_DEV_INTR_MODE_MSIX:
1450                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1451                         if (enic->msix[i].requested)
1452                                 free_irq(enic->msix_entry[i].vector,
1453                                         enic->msix[i].devid);
1454                 break;
1455         default:
1456                 break;
1457         }
1458 }
1459
1460 static int enic_request_intr(struct enic *enic)
1461 {
1462         struct net_device *netdev = enic->netdev;
1463         unsigned int i, intr;
1464         int err = 0;
1465
1466         enic_set_rx_cpu_rmap(enic);
1467         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1468
1469         case VNIC_DEV_INTR_MODE_INTX:
1470
1471                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1472                         IRQF_SHARED, netdev->name, netdev);
1473                 break;
1474
1475         case VNIC_DEV_INTR_MODE_MSI:
1476
1477                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1478                         0, netdev->name, enic);
1479                 break;
1480
1481         case VNIC_DEV_INTR_MODE_MSIX:
1482
1483                 for (i = 0; i < enic->rq_count; i++) {
1484                         intr = enic_msix_rq_intr(enic, i);
1485                         snprintf(enic->msix[intr].devname,
1486                                 sizeof(enic->msix[intr].devname),
1487                                 "%.11s-rx-%d", netdev->name, i);
1488                         enic->msix[intr].isr = enic_isr_msix;
1489                         enic->msix[intr].devid = &enic->napi[i];
1490                 }
1491
1492                 for (i = 0; i < enic->wq_count; i++) {
1493                         int wq = enic_cq_wq(enic, i);
1494
1495                         intr = enic_msix_wq_intr(enic, i);
1496                         snprintf(enic->msix[intr].devname,
1497                                 sizeof(enic->msix[intr].devname),
1498                                 "%.11s-tx-%d", netdev->name, i);
1499                         enic->msix[intr].isr = enic_isr_msix;
1500                         enic->msix[intr].devid = &enic->napi[wq];
1501                 }
1502
1503                 intr = enic_msix_err_intr(enic);
1504                 snprintf(enic->msix[intr].devname,
1505                         sizeof(enic->msix[intr].devname),
1506                         "%.11s-err", netdev->name);
1507                 enic->msix[intr].isr = enic_isr_msix_err;
1508                 enic->msix[intr].devid = enic;
1509
1510                 intr = enic_msix_notify_intr(enic);
1511                 snprintf(enic->msix[intr].devname,
1512                         sizeof(enic->msix[intr].devname),
1513                         "%.11s-notify", netdev->name);
1514                 enic->msix[intr].isr = enic_isr_msix_notify;
1515                 enic->msix[intr].devid = enic;
1516
1517                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1518                         enic->msix[i].requested = 0;
1519
1520                 for (i = 0; i < enic->intr_count; i++) {
1521                         err = request_irq(enic->msix_entry[i].vector,
1522                                 enic->msix[i].isr, 0,
1523                                 enic->msix[i].devname,
1524                                 enic->msix[i].devid);
1525                         if (err) {
1526                                 enic_free_intr(enic);
1527                                 break;
1528                         }
1529                         enic->msix[i].requested = 1;
1530                 }
1531
1532                 break;
1533
1534         default:
1535                 break;
1536         }
1537
1538         return err;
1539 }
1540
1541 static void enic_synchronize_irqs(struct enic *enic)
1542 {
1543         unsigned int i;
1544
1545         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1546         case VNIC_DEV_INTR_MODE_INTX:
1547         case VNIC_DEV_INTR_MODE_MSI:
1548                 synchronize_irq(enic->pdev->irq);
1549                 break;
1550         case VNIC_DEV_INTR_MODE_MSIX:
1551                 for (i = 0; i < enic->intr_count; i++)
1552                         synchronize_irq(enic->msix_entry[i].vector);
1553                 break;
1554         default:
1555                 break;
1556         }
1557 }
1558
1559 static void enic_set_rx_coal_setting(struct enic *enic)
1560 {
1561         unsigned int speed;
1562         int index = -1;
1563         struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1564
1565         /* If intr mode is not MSIX, do not do adaptive coalescing */
1566         if (VNIC_DEV_INTR_MODE_MSIX != vnic_dev_get_intr_mode(enic->vdev)) {
1567                 netdev_info(enic->netdev, "INTR mode is not MSIX, Not initializing adaptive coalescing");
1568                 return;
1569         }
1570
1571         /* 1. Read the link speed from fw
1572          * 2. Pick the default range for the speed
1573          * 3. Update it in enic->rx_coalesce_setting
1574          */
1575         speed = vnic_dev_port_speed(enic->vdev);
1576         if (ENIC_LINK_SPEED_10G < speed)
1577                 index = ENIC_LINK_40G_INDEX;
1578         else if (ENIC_LINK_SPEED_4G < speed)
1579                 index = ENIC_LINK_10G_INDEX;
1580         else
1581                 index = ENIC_LINK_4G_INDEX;
1582
1583         rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1584         rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1585         rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1586
1587         /* Start with the value provided by UCSM */
1588         for (index = 0; index < enic->rq_count; index++)
1589                 enic->cq[index].cur_rx_coal_timeval =
1590                                 enic->config.intr_timer_usec;
1591
1592         rx_coal->use_adaptive_rx_coalesce = 1;
1593 }
1594
1595 static int enic_dev_notify_set(struct enic *enic)
1596 {
1597         int err;
1598
1599         spin_lock_bh(&enic->devcmd_lock);
1600         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1601         case VNIC_DEV_INTR_MODE_INTX:
1602                 err = vnic_dev_notify_set(enic->vdev,
1603                         enic_legacy_notify_intr());
1604                 break;
1605         case VNIC_DEV_INTR_MODE_MSIX:
1606                 err = vnic_dev_notify_set(enic->vdev,
1607                         enic_msix_notify_intr(enic));
1608                 break;
1609         default:
1610                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1611                 break;
1612         }
1613         spin_unlock_bh(&enic->devcmd_lock);
1614
1615         return err;
1616 }
1617
1618 static void enic_notify_timer_start(struct enic *enic)
1619 {
1620         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1621         case VNIC_DEV_INTR_MODE_MSI:
1622                 mod_timer(&enic->notify_timer, jiffies);
1623                 break;
1624         default:
1625                 /* Using intr for notification for INTx/MSI-X */
1626                 break;
1627         }
1628 }
1629
1630 /* rtnl lock is held, process context */
1631 static int enic_open(struct net_device *netdev)
1632 {
1633         struct enic *enic = netdev_priv(netdev);
1634         unsigned int i;
1635         int err;
1636
1637         err = enic_request_intr(enic);
1638         if (err) {
1639                 netdev_err(netdev, "Unable to request irq.\n");
1640                 return err;
1641         }
1642
1643         err = enic_dev_notify_set(enic);
1644         if (err) {
1645                 netdev_err(netdev,
1646                         "Failed to alloc notify buffer, aborting.\n");
1647                 goto err_out_free_intr;
1648         }
1649
1650         for (i = 0; i < enic->rq_count; i++) {
1651                 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1652                 /* Need at least one buffer on ring to get going */
1653                 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1654                         netdev_err(netdev, "Unable to alloc receive buffers\n");
1655                         err = -ENOMEM;
1656                         goto err_out_free_rq;
1657                 }
1658         }
1659
1660         for (i = 0; i < enic->wq_count; i++)
1661                 vnic_wq_enable(&enic->wq[i]);
1662         for (i = 0; i < enic->rq_count; i++)
1663                 vnic_rq_enable(&enic->rq[i]);
1664
1665         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1666                 enic_dev_add_station_addr(enic);
1667
1668         enic_set_rx_mode(netdev);
1669
1670         netif_tx_wake_all_queues(netdev);
1671
1672         for (i = 0; i < enic->rq_count; i++) {
1673                 enic_busy_poll_init_lock(&enic->rq[i]);
1674                 napi_enable(&enic->napi[i]);
1675         }
1676         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1677                 for (i = 0; i < enic->wq_count; i++)
1678                         napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1679         enic_dev_enable(enic);
1680
1681         for (i = 0; i < enic->intr_count; i++)
1682                 vnic_intr_unmask(&enic->intr[i]);
1683
1684         enic_notify_timer_start(enic);
1685         enic_rfs_flw_tbl_init(enic);
1686
1687         return 0;
1688
1689 err_out_free_rq:
1690         for (i = 0; i < enic->rq_count; i++)
1691                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1692         enic_dev_notify_unset(enic);
1693 err_out_free_intr:
1694         enic_free_intr(enic);
1695
1696         return err;
1697 }
1698
1699 /* rtnl lock is held, process context */
1700 static int enic_stop(struct net_device *netdev)
1701 {
1702         struct enic *enic = netdev_priv(netdev);
1703         unsigned int i;
1704         int err;
1705
1706         for (i = 0; i < enic->intr_count; i++) {
1707                 vnic_intr_mask(&enic->intr[i]);
1708                 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1709         }
1710
1711         enic_synchronize_irqs(enic);
1712
1713         del_timer_sync(&enic->notify_timer);
1714         enic_rfs_flw_tbl_free(enic);
1715
1716         enic_dev_disable(enic);
1717
1718         for (i = 0; i < enic->rq_count; i++) {
1719                 napi_disable(&enic->napi[i]);
1720                 local_bh_disable();
1721                 while (!enic_poll_lock_napi(&enic->rq[i]))
1722                         mdelay(1);
1723                 local_bh_enable();
1724         }
1725
1726         netif_carrier_off(netdev);
1727         netif_tx_disable(netdev);
1728         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1729                 for (i = 0; i < enic->wq_count; i++)
1730                         napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1731
1732         if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1733                 enic_dev_del_station_addr(enic);
1734
1735         for (i = 0; i < enic->wq_count; i++) {
1736                 err = vnic_wq_disable(&enic->wq[i]);
1737                 if (err)
1738                         return err;
1739         }
1740         for (i = 0; i < enic->rq_count; i++) {
1741                 err = vnic_rq_disable(&enic->rq[i]);
1742                 if (err)
1743                         return err;
1744         }
1745
1746         enic_dev_notify_unset(enic);
1747         enic_free_intr(enic);
1748
1749         for (i = 0; i < enic->wq_count; i++)
1750                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1751         for (i = 0; i < enic->rq_count; i++)
1752                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1753         for (i = 0; i < enic->cq_count; i++)
1754                 vnic_cq_clean(&enic->cq[i]);
1755         for (i = 0; i < enic->intr_count; i++)
1756                 vnic_intr_clean(&enic->intr[i]);
1757
1758         return 0;
1759 }
1760
1761 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1762 {
1763         struct enic *enic = netdev_priv(netdev);
1764         int running = netif_running(netdev);
1765
1766         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1767                 return -EINVAL;
1768
1769         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
1770                 return -EOPNOTSUPP;
1771
1772         if (running)
1773                 enic_stop(netdev);
1774
1775         netdev->mtu = new_mtu;
1776
1777         if (netdev->mtu > enic->port_mtu)
1778                 netdev_warn(netdev,
1779                         "interface MTU (%d) set higher than port MTU (%d)\n",
1780                         netdev->mtu, enic->port_mtu);
1781
1782         if (running)
1783                 enic_open(netdev);
1784
1785         return 0;
1786 }
1787
1788 static void enic_change_mtu_work(struct work_struct *work)
1789 {
1790         struct enic *enic = container_of(work, struct enic, change_mtu_work);
1791         struct net_device *netdev = enic->netdev;
1792         int new_mtu = vnic_dev_mtu(enic->vdev);
1793         int err;
1794         unsigned int i;
1795
1796         new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1797
1798         rtnl_lock();
1799
1800         /* Stop RQ */
1801         del_timer_sync(&enic->notify_timer);
1802
1803         for (i = 0; i < enic->rq_count; i++)
1804                 napi_disable(&enic->napi[i]);
1805
1806         vnic_intr_mask(&enic->intr[0]);
1807         enic_synchronize_irqs(enic);
1808         err = vnic_rq_disable(&enic->rq[0]);
1809         if (err) {
1810                 rtnl_unlock();
1811                 netdev_err(netdev, "Unable to disable RQ.\n");
1812                 return;
1813         }
1814         vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1815         vnic_cq_clean(&enic->cq[0]);
1816         vnic_intr_clean(&enic->intr[0]);
1817
1818         /* Fill RQ with new_mtu-sized buffers */
1819         netdev->mtu = new_mtu;
1820         vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1821         /* Need at least one buffer on ring to get going */
1822         if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1823                 rtnl_unlock();
1824                 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1825                 return;
1826         }
1827
1828         /* Start RQ */
1829         vnic_rq_enable(&enic->rq[0]);
1830         napi_enable(&enic->napi[0]);
1831         vnic_intr_unmask(&enic->intr[0]);
1832         enic_notify_timer_start(enic);
1833
1834         rtnl_unlock();
1835
1836         netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1837 }
1838
1839 #ifdef CONFIG_NET_POLL_CONTROLLER
1840 static void enic_poll_controller(struct net_device *netdev)
1841 {
1842         struct enic *enic = netdev_priv(netdev);
1843         struct vnic_dev *vdev = enic->vdev;
1844         unsigned int i, intr;
1845
1846         switch (vnic_dev_get_intr_mode(vdev)) {
1847         case VNIC_DEV_INTR_MODE_MSIX:
1848                 for (i = 0; i < enic->rq_count; i++) {
1849                         intr = enic_msix_rq_intr(enic, i);
1850                         enic_isr_msix(enic->msix_entry[intr].vector,
1851                                       &enic->napi[i]);
1852                 }
1853
1854                 for (i = 0; i < enic->wq_count; i++) {
1855                         intr = enic_msix_wq_intr(enic, i);
1856                         enic_isr_msix(enic->msix_entry[intr].vector,
1857                                       &enic->napi[enic_cq_wq(enic, i)]);
1858                 }
1859
1860                 break;
1861         case VNIC_DEV_INTR_MODE_MSI:
1862                 enic_isr_msi(enic->pdev->irq, enic);
1863                 break;
1864         case VNIC_DEV_INTR_MODE_INTX:
1865                 enic_isr_legacy(enic->pdev->irq, netdev);
1866                 break;
1867         default:
1868                 break;
1869         }
1870 }
1871 #endif
1872
1873 static int enic_dev_wait(struct vnic_dev *vdev,
1874         int (*start)(struct vnic_dev *, int),
1875         int (*finished)(struct vnic_dev *, int *),
1876         int arg)
1877 {
1878         unsigned long time;
1879         int done;
1880         int err;
1881
1882         BUG_ON(in_interrupt());
1883
1884         err = start(vdev, arg);
1885         if (err)
1886                 return err;
1887
1888         /* Wait for func to complete...2 seconds max
1889          */
1890
1891         time = jiffies + (HZ * 2);
1892         do {
1893
1894                 err = finished(vdev, &done);
1895                 if (err)
1896                         return err;
1897
1898                 if (done)
1899                         return 0;
1900
1901                 schedule_timeout_uninterruptible(HZ / 10);
1902
1903         } while (time_after(time, jiffies));
1904
1905         return -ETIMEDOUT;
1906 }
1907
1908 static int enic_dev_open(struct enic *enic)
1909 {
1910         int err;
1911
1912         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1913                 vnic_dev_open_done, 0);
1914         if (err)
1915                 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1916                         err);
1917
1918         return err;
1919 }
1920
1921 static int enic_dev_hang_reset(struct enic *enic)
1922 {
1923         int err;
1924
1925         err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1926                 vnic_dev_hang_reset_done, 0);
1927         if (err)
1928                 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1929                         err);
1930
1931         return err;
1932 }
1933
1934 int __enic_set_rsskey(struct enic *enic)
1935 {
1936         union vnic_rss_key *rss_key_buf_va;
1937         dma_addr_t rss_key_buf_pa;
1938         int i, kidx, bidx, err;
1939
1940         rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
1941                                                sizeof(union vnic_rss_key),
1942                                                &rss_key_buf_pa);
1943         if (!rss_key_buf_va)
1944                 return -ENOMEM;
1945
1946         for (i = 0; i < ENIC_RSS_LEN; i++) {
1947                 kidx = i / ENIC_RSS_BYTES_PER_KEY;
1948                 bidx = i % ENIC_RSS_BYTES_PER_KEY;
1949                 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
1950         }
1951         spin_lock_bh(&enic->devcmd_lock);
1952         err = enic_set_rss_key(enic,
1953                 rss_key_buf_pa,
1954                 sizeof(union vnic_rss_key));
1955         spin_unlock_bh(&enic->devcmd_lock);
1956
1957         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1958                 rss_key_buf_va, rss_key_buf_pa);
1959
1960         return err;
1961 }
1962
1963 static int enic_set_rsskey(struct enic *enic)
1964 {
1965         netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
1966
1967         return __enic_set_rsskey(enic);
1968 }
1969
1970 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1971 {
1972         dma_addr_t rss_cpu_buf_pa;
1973         union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1974         unsigned int i;
1975         int err;
1976
1977         rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1978                 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1979         if (!rss_cpu_buf_va)
1980                 return -ENOMEM;
1981
1982         for (i = 0; i < (1 << rss_hash_bits); i++)
1983                 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1984
1985         spin_lock_bh(&enic->devcmd_lock);
1986         err = enic_set_rss_cpu(enic,
1987                 rss_cpu_buf_pa,
1988                 sizeof(union vnic_rss_cpu));
1989         spin_unlock_bh(&enic->devcmd_lock);
1990
1991         pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1992                 rss_cpu_buf_va, rss_cpu_buf_pa);
1993
1994         return err;
1995 }
1996
1997 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
1998         u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
1999 {
2000         const u8 tso_ipid_split_en = 0;
2001         const u8 ig_vlan_strip_en = 1;
2002         int err;
2003
2004         /* Enable VLAN tag stripping.
2005         */
2006
2007         spin_lock_bh(&enic->devcmd_lock);
2008         err = enic_set_nic_cfg(enic,
2009                 rss_default_cpu, rss_hash_type,
2010                 rss_hash_bits, rss_base_cpu,
2011                 rss_enable, tso_ipid_split_en,
2012                 ig_vlan_strip_en);
2013         spin_unlock_bh(&enic->devcmd_lock);
2014
2015         return err;
2016 }
2017
2018 static int enic_set_rss_nic_cfg(struct enic *enic)
2019 {
2020         struct device *dev = enic_get_dev(enic);
2021         const u8 rss_default_cpu = 0;
2022         const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
2023                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
2024                 NIC_CFG_RSS_HASH_TYPE_IPV6 |
2025                 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2026         const u8 rss_hash_bits = 7;
2027         const u8 rss_base_cpu = 0;
2028         u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2029
2030         if (rss_enable) {
2031                 if (!enic_set_rsskey(enic)) {
2032                         if (enic_set_rsscpu(enic, rss_hash_bits)) {
2033                                 rss_enable = 0;
2034                                 dev_warn(dev, "RSS disabled, "
2035                                         "Failed to set RSS cpu indirection table.");
2036                         }
2037                 } else {
2038                         rss_enable = 0;
2039                         dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2040                 }
2041         }
2042
2043         return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2044                 rss_hash_bits, rss_base_cpu, rss_enable);
2045 }
2046
2047 static void enic_reset(struct work_struct *work)
2048 {
2049         struct enic *enic = container_of(work, struct enic, reset);
2050
2051         if (!netif_running(enic->netdev))
2052                 return;
2053
2054         rtnl_lock();
2055
2056         spin_lock(&enic->enic_api_lock);
2057         enic_dev_hang_notify(enic);
2058         enic_stop(enic->netdev);
2059         enic_dev_hang_reset(enic);
2060         enic_reset_addr_lists(enic);
2061         enic_init_vnic_resources(enic);
2062         enic_set_rss_nic_cfg(enic);
2063         enic_dev_set_ig_vlan_rewrite_mode(enic);
2064         enic_open(enic->netdev);
2065         spin_unlock(&enic->enic_api_lock);
2066         call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2067
2068         rtnl_unlock();
2069 }
2070
2071 static int enic_set_intr_mode(struct enic *enic)
2072 {
2073         unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2074         unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2075         unsigned int i;
2076
2077         /* Set interrupt mode (INTx, MSI, MSI-X) depending
2078          * on system capabilities.
2079          *
2080          * Try MSI-X first
2081          *
2082          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2083          * (the second to last INTR is used for WQ/RQ errors)
2084          * (the last INTR is used for notifications)
2085          */
2086
2087         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2088         for (i = 0; i < n + m + 2; i++)
2089                 enic->msix_entry[i].entry = i;
2090
2091         /* Use multiple RQs if RSS is enabled
2092          */
2093
2094         if (ENIC_SETTING(enic, RSS) &&
2095             enic->config.intr_mode < 1 &&
2096             enic->rq_count >= n &&
2097             enic->wq_count >= m &&
2098             enic->cq_count >= n + m &&
2099             enic->intr_count >= n + m + 2) {
2100
2101                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2102                                           n + m + 2, n + m + 2) > 0) {
2103
2104                         enic->rq_count = n;
2105                         enic->wq_count = m;
2106                         enic->cq_count = n + m;
2107                         enic->intr_count = n + m + 2;
2108
2109                         vnic_dev_set_intr_mode(enic->vdev,
2110                                 VNIC_DEV_INTR_MODE_MSIX);
2111
2112                         return 0;
2113                 }
2114         }
2115
2116         if (enic->config.intr_mode < 1 &&
2117             enic->rq_count >= 1 &&
2118             enic->wq_count >= m &&
2119             enic->cq_count >= 1 + m &&
2120             enic->intr_count >= 1 + m + 2) {
2121                 if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2122                                           1 + m + 2, 1 + m + 2) > 0) {
2123
2124                         enic->rq_count = 1;
2125                         enic->wq_count = m;
2126                         enic->cq_count = 1 + m;
2127                         enic->intr_count = 1 + m + 2;
2128
2129                         vnic_dev_set_intr_mode(enic->vdev,
2130                                 VNIC_DEV_INTR_MODE_MSIX);
2131
2132                         return 0;
2133                 }
2134         }
2135
2136         /* Next try MSI
2137          *
2138          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2139          */
2140
2141         if (enic->config.intr_mode < 2 &&
2142             enic->rq_count >= 1 &&
2143             enic->wq_count >= 1 &&
2144             enic->cq_count >= 2 &&
2145             enic->intr_count >= 1 &&
2146             !pci_enable_msi(enic->pdev)) {
2147
2148                 enic->rq_count = 1;
2149                 enic->wq_count = 1;
2150                 enic->cq_count = 2;
2151                 enic->intr_count = 1;
2152
2153                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2154
2155                 return 0;
2156         }
2157
2158         /* Next try INTx
2159          *
2160          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2161          * (the first INTR is used for WQ/RQ)
2162          * (the second INTR is used for WQ/RQ errors)
2163          * (the last INTR is used for notifications)
2164          */
2165
2166         if (enic->config.intr_mode < 3 &&
2167             enic->rq_count >= 1 &&
2168             enic->wq_count >= 1 &&
2169             enic->cq_count >= 2 &&
2170             enic->intr_count >= 3) {
2171
2172                 enic->rq_count = 1;
2173                 enic->wq_count = 1;
2174                 enic->cq_count = 2;
2175                 enic->intr_count = 3;
2176
2177                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2178
2179                 return 0;
2180         }
2181
2182         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2183
2184         return -EINVAL;
2185 }
2186
2187 static void enic_clear_intr_mode(struct enic *enic)
2188 {
2189         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2190         case VNIC_DEV_INTR_MODE_MSIX:
2191                 pci_disable_msix(enic->pdev);
2192                 break;
2193         case VNIC_DEV_INTR_MODE_MSI:
2194                 pci_disable_msi(enic->pdev);
2195                 break;
2196         default:
2197                 break;
2198         }
2199
2200         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2201 }
2202
2203 static const struct net_device_ops enic_netdev_dynamic_ops = {
2204         .ndo_open               = enic_open,
2205         .ndo_stop               = enic_stop,
2206         .ndo_start_xmit         = enic_hard_start_xmit,
2207         .ndo_get_stats64        = enic_get_stats,
2208         .ndo_validate_addr      = eth_validate_addr,
2209         .ndo_set_rx_mode        = enic_set_rx_mode,
2210         .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2211         .ndo_change_mtu         = enic_change_mtu,
2212         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2213         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2214         .ndo_tx_timeout         = enic_tx_timeout,
2215         .ndo_set_vf_port        = enic_set_vf_port,
2216         .ndo_get_vf_port        = enic_get_vf_port,
2217         .ndo_set_vf_mac         = enic_set_vf_mac,
2218 #ifdef CONFIG_NET_POLL_CONTROLLER
2219         .ndo_poll_controller    = enic_poll_controller,
2220 #endif
2221 #ifdef CONFIG_RFS_ACCEL
2222         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2223 #endif
2224 #ifdef CONFIG_NET_RX_BUSY_POLL
2225         .ndo_busy_poll          = enic_busy_poll,
2226 #endif
2227 };
2228
2229 static const struct net_device_ops enic_netdev_ops = {
2230         .ndo_open               = enic_open,
2231         .ndo_stop               = enic_stop,
2232         .ndo_start_xmit         = enic_hard_start_xmit,
2233         .ndo_get_stats64        = enic_get_stats,
2234         .ndo_validate_addr      = eth_validate_addr,
2235         .ndo_set_mac_address    = enic_set_mac_address,
2236         .ndo_set_rx_mode        = enic_set_rx_mode,
2237         .ndo_change_mtu         = enic_change_mtu,
2238         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2239         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2240         .ndo_tx_timeout         = enic_tx_timeout,
2241         .ndo_set_vf_port        = enic_set_vf_port,
2242         .ndo_get_vf_port        = enic_get_vf_port,
2243         .ndo_set_vf_mac         = enic_set_vf_mac,
2244 #ifdef CONFIG_NET_POLL_CONTROLLER
2245         .ndo_poll_controller    = enic_poll_controller,
2246 #endif
2247 #ifdef CONFIG_RFS_ACCEL
2248         .ndo_rx_flow_steer      = enic_rx_flow_steer,
2249 #endif
2250 #ifdef CONFIG_NET_RX_BUSY_POLL
2251         .ndo_busy_poll          = enic_busy_poll,
2252 #endif
2253 };
2254
2255 static void enic_dev_deinit(struct enic *enic)
2256 {
2257         unsigned int i;
2258
2259         for (i = 0; i < enic->rq_count; i++) {
2260                 napi_hash_del(&enic->napi[i]);
2261                 netif_napi_del(&enic->napi[i]);
2262         }
2263         if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2264                 for (i = 0; i < enic->wq_count; i++)
2265                         netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2266
2267         enic_free_vnic_resources(enic);
2268         enic_clear_intr_mode(enic);
2269 }
2270
2271 static void enic_kdump_kernel_config(struct enic *enic)
2272 {
2273         if (is_kdump_kernel()) {
2274                 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2275                 enic->rq_count = 1;
2276                 enic->wq_count = 1;
2277                 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2278                 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2279                 enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2280         }
2281 }
2282
2283 static int enic_dev_init(struct enic *enic)
2284 {
2285         struct device *dev = enic_get_dev(enic);
2286         struct net_device *netdev = enic->netdev;
2287         unsigned int i;
2288         int err;
2289
2290         /* Get interrupt coalesce timer info */
2291         err = enic_dev_intr_coal_timer_info(enic);
2292         if (err) {
2293                 dev_warn(dev, "Using default conversion factor for "
2294                         "interrupt coalesce timer\n");
2295                 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2296         }
2297
2298         /* Get vNIC configuration
2299          */
2300
2301         err = enic_get_vnic_config(enic);
2302         if (err) {
2303                 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2304                 return err;
2305         }
2306
2307         /* Get available resource counts
2308          */
2309
2310         enic_get_res_counts(enic);
2311
2312         /* modify resource count if we are in kdump_kernel
2313          */
2314         enic_kdump_kernel_config(enic);
2315
2316         /* Set interrupt mode based on resource counts and system
2317          * capabilities
2318          */
2319
2320         err = enic_set_intr_mode(enic);
2321         if (err) {
2322                 dev_err(dev, "Failed to set intr mode based on resource "
2323                         "counts and system capabilities, aborting\n");
2324                 return err;
2325         }
2326
2327         /* Allocate and configure vNIC resources
2328          */
2329
2330         err = enic_alloc_vnic_resources(enic);
2331         if (err) {
2332                 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2333                 goto err_out_free_vnic_resources;
2334         }
2335
2336         enic_init_vnic_resources(enic);
2337
2338         err = enic_set_rss_nic_cfg(enic);
2339         if (err) {
2340                 dev_err(dev, "Failed to config nic, aborting\n");
2341                 goto err_out_free_vnic_resources;
2342         }
2343
2344         switch (vnic_dev_get_intr_mode(enic->vdev)) {
2345         default:
2346                 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2347                 napi_hash_add(&enic->napi[0]);
2348                 break;
2349         case VNIC_DEV_INTR_MODE_MSIX:
2350                 for (i = 0; i < enic->rq_count; i++) {
2351                         netif_napi_add(netdev, &enic->napi[i],
2352                                 enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2353                         napi_hash_add(&enic->napi[i]);
2354                 }
2355                 for (i = 0; i < enic->wq_count; i++)
2356                         netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2357                                        enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2358                 break;
2359         }
2360
2361         return 0;
2362
2363 err_out_free_vnic_resources:
2364         enic_clear_intr_mode(enic);
2365         enic_free_vnic_resources(enic);
2366
2367         return err;
2368 }
2369
2370 static void enic_iounmap(struct enic *enic)
2371 {
2372         unsigned int i;
2373
2374         for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2375                 if (enic->bar[i].vaddr)
2376                         iounmap(enic->bar[i].vaddr);
2377 }
2378
2379 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2380 {
2381         struct device *dev = &pdev->dev;
2382         struct net_device *netdev;
2383         struct enic *enic;
2384         int using_dac = 0;
2385         unsigned int i;
2386         int err;
2387 #ifdef CONFIG_PCI_IOV
2388         int pos = 0;
2389 #endif
2390         int num_pps = 1;
2391
2392         /* Allocate net device structure and initialize.  Private
2393          * instance data is initialized to zero.
2394          */
2395
2396         netdev = alloc_etherdev_mqs(sizeof(struct enic),
2397                                     ENIC_RQ_MAX, ENIC_WQ_MAX);
2398         if (!netdev)
2399                 return -ENOMEM;
2400
2401         pci_set_drvdata(pdev, netdev);
2402
2403         SET_NETDEV_DEV(netdev, &pdev->dev);
2404
2405         enic = netdev_priv(netdev);
2406         enic->netdev = netdev;
2407         enic->pdev = pdev;
2408
2409         /* Setup PCI resources
2410          */
2411
2412         err = pci_enable_device_mem(pdev);
2413         if (err) {
2414                 dev_err(dev, "Cannot enable PCI device, aborting\n");
2415                 goto err_out_free_netdev;
2416         }
2417
2418         err = pci_request_regions(pdev, DRV_NAME);
2419         if (err) {
2420                 dev_err(dev, "Cannot request PCI regions, aborting\n");
2421                 goto err_out_disable_device;
2422         }
2423
2424         pci_set_master(pdev);
2425
2426         /* Query PCI controller on system for DMA addressing
2427          * limitation for the device.  Try 64-bit first, and
2428          * fail to 32-bit.
2429          */
2430
2431         err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
2432         if (err) {
2433                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2434                 if (err) {
2435                         dev_err(dev, "No usable DMA configuration, aborting\n");
2436                         goto err_out_release_regions;
2437                 }
2438                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2439                 if (err) {
2440                         dev_err(dev, "Unable to obtain %u-bit DMA "
2441                                 "for consistent allocations, aborting\n", 32);
2442                         goto err_out_release_regions;
2443                 }
2444         } else {
2445                 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
2446                 if (err) {
2447                         dev_err(dev, "Unable to obtain %u-bit DMA "
2448                                 "for consistent allocations, aborting\n", 64);
2449                         goto err_out_release_regions;
2450                 }
2451                 using_dac = 1;
2452         }
2453
2454         /* Map vNIC resources from BAR0-5
2455          */
2456
2457         for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2458                 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2459                         continue;
2460                 enic->bar[i].len = pci_resource_len(pdev, i);
2461                 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2462                 if (!enic->bar[i].vaddr) {
2463                         dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2464                         err = -ENODEV;
2465                         goto err_out_iounmap;
2466                 }
2467                 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2468         }
2469
2470         /* Register vNIC device
2471          */
2472
2473         enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2474                 ARRAY_SIZE(enic->bar));
2475         if (!enic->vdev) {
2476                 dev_err(dev, "vNIC registration failed, aborting\n");
2477                 err = -ENODEV;
2478                 goto err_out_iounmap;
2479         }
2480
2481 #ifdef CONFIG_PCI_IOV
2482         /* Get number of subvnics */
2483         pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2484         if (pos) {
2485                 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2486                         &enic->num_vfs);
2487                 if (enic->num_vfs) {
2488                         err = pci_enable_sriov(pdev, enic->num_vfs);
2489                         if (err) {
2490                                 dev_err(dev, "SRIOV enable failed, aborting."
2491                                         " pci_enable_sriov() returned %d\n",
2492                                         err);
2493                                 goto err_out_vnic_unregister;
2494                         }
2495                         enic->priv_flags |= ENIC_SRIOV_ENABLED;
2496                         num_pps = enic->num_vfs;
2497                 }
2498         }
2499 #endif
2500
2501         /* Allocate structure for port profiles */
2502         enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2503         if (!enic->pp) {
2504                 err = -ENOMEM;
2505                 goto err_out_disable_sriov_pp;
2506         }
2507
2508         /* Issue device open to get device in known state
2509          */
2510
2511         err = enic_dev_open(enic);
2512         if (err) {
2513                 dev_err(dev, "vNIC dev open failed, aborting\n");
2514                 goto err_out_disable_sriov;
2515         }
2516
2517         /* Setup devcmd lock
2518          */
2519
2520         spin_lock_init(&enic->devcmd_lock);
2521         spin_lock_init(&enic->enic_api_lock);
2522
2523         /*
2524          * Set ingress vlan rewrite mode before vnic initialization
2525          */
2526
2527         err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2528         if (err) {
2529                 dev_err(dev,
2530                         "Failed to set ingress vlan rewrite mode, aborting.\n");
2531                 goto err_out_dev_close;
2532         }
2533
2534         /* Issue device init to initialize the vnic-to-switch link.
2535          * We'll start with carrier off and wait for link UP
2536          * notification later to turn on carrier.  We don't need
2537          * to wait here for the vnic-to-switch link initialization
2538          * to complete; link UP notification is the indication that
2539          * the process is complete.
2540          */
2541
2542         netif_carrier_off(netdev);
2543
2544         /* Do not call dev_init for a dynamic vnic.
2545          * For a dynamic vnic, init_prov_info will be
2546          * called later by an upper layer.
2547          */
2548
2549         if (!enic_is_dynamic(enic)) {
2550                 err = vnic_dev_init(enic->vdev, 0);
2551                 if (err) {
2552                         dev_err(dev, "vNIC dev init failed, aborting\n");
2553                         goto err_out_dev_close;
2554                 }
2555         }
2556
2557         err = enic_dev_init(enic);
2558         if (err) {
2559                 dev_err(dev, "Device initialization failed, aborting\n");
2560                 goto err_out_dev_close;
2561         }
2562
2563         netif_set_real_num_tx_queues(netdev, enic->wq_count);
2564         netif_set_real_num_rx_queues(netdev, enic->rq_count);
2565
2566         /* Setup notification timer, HW reset task, and wq locks
2567          */
2568
2569         init_timer(&enic->notify_timer);
2570         enic->notify_timer.function = enic_notify_timer;
2571         enic->notify_timer.data = (unsigned long)enic;
2572
2573         enic_set_rx_coal_setting(enic);
2574         INIT_WORK(&enic->reset, enic_reset);
2575         INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2576
2577         for (i = 0; i < enic->wq_count; i++)
2578                 spin_lock_init(&enic->wq_lock[i]);
2579
2580         /* Register net device
2581          */
2582
2583         enic->port_mtu = enic->config.mtu;
2584         (void)enic_change_mtu(netdev, enic->port_mtu);
2585
2586         err = enic_set_mac_addr(netdev, enic->mac_addr);
2587         if (err) {
2588                 dev_err(dev, "Invalid MAC address, aborting\n");
2589                 goto err_out_dev_deinit;
2590         }
2591
2592         enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2593         /* rx coalesce time already got initialized. This gets used
2594          * if adaptive coal is turned off
2595          */
2596         enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2597
2598         if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2599                 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2600         else
2601                 netdev->netdev_ops = &enic_netdev_ops;
2602
2603         netdev->watchdog_timeo = 2 * HZ;
2604         enic_set_ethtool_ops(netdev);
2605
2606         netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2607         if (ENIC_SETTING(enic, LOOP)) {
2608                 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2609                 enic->loop_enable = 1;
2610                 enic->loop_tag = enic->config.loop_tag;
2611                 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2612         }
2613         if (ENIC_SETTING(enic, TXCSUM))
2614                 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2615         if (ENIC_SETTING(enic, TSO))
2616                 netdev->hw_features |= NETIF_F_TSO |
2617                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2618         if (ENIC_SETTING(enic, RSS))
2619                 netdev->hw_features |= NETIF_F_RXHASH;
2620         if (ENIC_SETTING(enic, RXCSUM))
2621                 netdev->hw_features |= NETIF_F_RXCSUM;
2622
2623         netdev->features |= netdev->hw_features;
2624
2625 #ifdef CONFIG_RFS_ACCEL
2626         netdev->hw_features |= NETIF_F_NTUPLE;
2627 #endif
2628
2629         if (using_dac)
2630                 netdev->features |= NETIF_F_HIGHDMA;
2631
2632         netdev->priv_flags |= IFF_UNICAST_FLT;
2633
2634         err = register_netdev(netdev);
2635         if (err) {
2636                 dev_err(dev, "Cannot register net device, aborting\n");
2637                 goto err_out_dev_deinit;
2638         }
2639         enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2640
2641         return 0;
2642
2643 err_out_dev_deinit:
2644         enic_dev_deinit(enic);
2645 err_out_dev_close:
2646         vnic_dev_close(enic->vdev);
2647 err_out_disable_sriov:
2648         kfree(enic->pp);
2649 err_out_disable_sriov_pp:
2650 #ifdef CONFIG_PCI_IOV
2651         if (enic_sriov_enabled(enic)) {
2652                 pci_disable_sriov(pdev);
2653                 enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2654         }
2655 err_out_vnic_unregister:
2656 #endif
2657         vnic_dev_unregister(enic->vdev);
2658 err_out_iounmap:
2659         enic_iounmap(enic);
2660 err_out_release_regions:
2661         pci_release_regions(pdev);
2662 err_out_disable_device:
2663         pci_disable_device(pdev);
2664 err_out_free_netdev:
2665         free_netdev(netdev);
2666
2667         return err;
2668 }
2669
2670 static void enic_remove(struct pci_dev *pdev)
2671 {
2672         struct net_device *netdev = pci_get_drvdata(pdev);
2673
2674         if (netdev) {
2675                 struct enic *enic = netdev_priv(netdev);
2676
2677                 cancel_work_sync(&enic->reset);
2678                 cancel_work_sync(&enic->change_mtu_work);
2679                 unregister_netdev(netdev);
2680                 enic_dev_deinit(enic);
2681                 vnic_dev_close(enic->vdev);
2682 #ifdef CONFIG_PCI_IOV
2683                 if (enic_sriov_enabled(enic)) {
2684                         pci_disable_sriov(pdev);
2685                         enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2686                 }
2687 #endif
2688                 kfree(enic->pp);
2689                 vnic_dev_unregister(enic->vdev);
2690                 enic_iounmap(enic);
2691                 pci_release_regions(pdev);
2692                 pci_disable_device(pdev);
2693                 free_netdev(netdev);
2694         }
2695 }
2696
2697 static struct pci_driver enic_driver = {
2698         .name = DRV_NAME,
2699         .id_table = enic_id_table,
2700         .probe = enic_probe,
2701         .remove = enic_remove,
2702 };
2703
2704 static int __init enic_init_module(void)
2705 {
2706         pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2707
2708         return pci_register_driver(&enic_driver);
2709 }
2710
2711 static void __exit enic_cleanup_module(void)
2712 {
2713         pci_unregister_driver(&enic_driver);
2714 }
2715
2716 module_init(enic_init_module);
2717 module_exit(enic_cleanup_module);