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