linux/drivers/scsi/fnic/vnic_dev.c
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   1/*
   2 * Copyright 2008 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#include <linux/kernel.h>
  20#include <linux/errno.h>
  21#include <linux/types.h>
  22#include <linux/pci.h>
  23#include <linux/delay.h>
  24#include <linux/if_ether.h>
  25#include <linux/slab.h>
  26#include "vnic_resource.h"
  27#include "vnic_devcmd.h"
  28#include "vnic_dev.h"
  29#include "vnic_stats.h"
  30
  31struct vnic_res {
  32        void __iomem *vaddr;
  33        unsigned int count;
  34};
  35
  36struct vnic_dev {
  37        void *priv;
  38        struct pci_dev *pdev;
  39        struct vnic_res res[RES_TYPE_MAX];
  40        enum vnic_dev_intr_mode intr_mode;
  41        struct vnic_devcmd __iomem *devcmd;
  42        struct vnic_devcmd_notify *notify;
  43        struct vnic_devcmd_notify notify_copy;
  44        dma_addr_t notify_pa;
  45        u32 *linkstatus;
  46        dma_addr_t linkstatus_pa;
  47        struct vnic_stats *stats;
  48        dma_addr_t stats_pa;
  49        struct vnic_devcmd_fw_info *fw_info;
  50        dma_addr_t fw_info_pa;
  51};
  52
  53#define VNIC_MAX_RES_HDR_SIZE \
  54        (sizeof(struct vnic_resource_header) + \
  55        sizeof(struct vnic_resource) * RES_TYPE_MAX)
  56#define VNIC_RES_STRIDE 128
  57
  58void *vnic_dev_priv(struct vnic_dev *vdev)
  59{
  60        return vdev->priv;
  61}
  62
  63static int vnic_dev_discover_res(struct vnic_dev *vdev,
  64        struct vnic_dev_bar *bar)
  65{
  66        struct vnic_resource_header __iomem *rh;
  67        struct vnic_resource __iomem *r;
  68        u8 type;
  69
  70        if (bar->len < VNIC_MAX_RES_HDR_SIZE) {
  71                printk(KERN_ERR "vNIC BAR0 res hdr length error\n");
  72                return -EINVAL;
  73        }
  74
  75        rh = bar->vaddr;
  76        if (!rh) {
  77                printk(KERN_ERR "vNIC BAR0 res hdr not mem-mapped\n");
  78                return -EINVAL;
  79        }
  80
  81        if (ioread32(&rh->magic) != VNIC_RES_MAGIC ||
  82            ioread32(&rh->version) != VNIC_RES_VERSION) {
  83                printk(KERN_ERR "vNIC BAR0 res magic/version error "
  84                        "exp (%lx/%lx) curr (%x/%x)\n",
  85                        VNIC_RES_MAGIC, VNIC_RES_VERSION,
  86                        ioread32(&rh->magic), ioread32(&rh->version));
  87                return -EINVAL;
  88        }
  89
  90        r = (struct vnic_resource __iomem *)(rh + 1);
  91
  92        while ((type = ioread8(&r->type)) != RES_TYPE_EOL) {
  93
  94                u8 bar_num = ioread8(&r->bar);
  95                u32 bar_offset = ioread32(&r->bar_offset);
  96                u32 count = ioread32(&r->count);
  97                u32 len;
  98
  99                r++;
 100
 101                if (bar_num != 0)  /* only mapping in BAR0 resources */
 102                        continue;
 103
 104                switch (type) {
 105                case RES_TYPE_WQ:
 106                case RES_TYPE_RQ:
 107                case RES_TYPE_CQ:
 108                case RES_TYPE_INTR_CTRL:
 109                        /* each count is stride bytes long */
 110                        len = count * VNIC_RES_STRIDE;
 111                        if (len + bar_offset > bar->len) {
 112                                printk(KERN_ERR "vNIC BAR0 resource %d "
 113                                        "out-of-bounds, offset 0x%x + "
 114                                        "size 0x%x > bar len 0x%lx\n",
 115                                        type, bar_offset,
 116                                        len,
 117                                        bar->len);
 118                                return -EINVAL;
 119                        }
 120                        break;
 121                case RES_TYPE_INTR_PBA_LEGACY:
 122                case RES_TYPE_DEVCMD:
 123                        len = count;
 124                        break;
 125                default:
 126                        continue;
 127                }
 128
 129                vdev->res[type].count = count;
 130                vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset;
 131        }
 132
 133        return 0;
 134}
 135
 136unsigned int vnic_dev_get_res_count(struct vnic_dev *vdev,
 137        enum vnic_res_type type)
 138{
 139        return vdev->res[type].count;
 140}
 141
 142void __iomem *vnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type,
 143        unsigned int index)
 144{
 145        if (!vdev->res[type].vaddr)
 146                return NULL;
 147
 148        switch (type) {
 149        case RES_TYPE_WQ:
 150        case RES_TYPE_RQ:
 151        case RES_TYPE_CQ:
 152        case RES_TYPE_INTR_CTRL:
 153                return (char __iomem *)vdev->res[type].vaddr +
 154                                        index * VNIC_RES_STRIDE;
 155        default:
 156                return (char __iomem *)vdev->res[type].vaddr;
 157        }
 158}
 159
 160unsigned int vnic_dev_desc_ring_size(struct vnic_dev_ring *ring,
 161                                     unsigned int desc_count,
 162                                     unsigned int desc_size)
 163{
 164        /* The base address of the desc rings must be 512 byte aligned.
 165         * Descriptor count is aligned to groups of 32 descriptors.  A
 166         * count of 0 means the maximum 4096 descriptors.  Descriptor
 167         * size is aligned to 16 bytes.
 168         */
 169
 170        unsigned int count_align = 32;
 171        unsigned int desc_align = 16;
 172
 173        ring->base_align = 512;
 174
 175        if (desc_count == 0)
 176                desc_count = 4096;
 177
 178        ring->desc_count = ALIGN(desc_count, count_align);
 179
 180        ring->desc_size = ALIGN(desc_size, desc_align);
 181
 182        ring->size = ring->desc_count * ring->desc_size;
 183        ring->size_unaligned = ring->size + ring->base_align;
 184
 185        return ring->size_unaligned;
 186}
 187
 188void vnic_dev_clear_desc_ring(struct vnic_dev_ring *ring)
 189{
 190        memset(ring->descs, 0, ring->size);
 191}
 192
 193int vnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring,
 194        unsigned int desc_count, unsigned int desc_size)
 195{
 196        vnic_dev_desc_ring_size(ring, desc_count, desc_size);
 197
 198        ring->descs_unaligned = pci_alloc_consistent(vdev->pdev,
 199                ring->size_unaligned,
 200                &ring->base_addr_unaligned);
 201
 202        if (!ring->descs_unaligned) {
 203                printk(KERN_ERR
 204                  "Failed to allocate ring (size=%d), aborting\n",
 205                        (int)ring->size);
 206                return -ENOMEM;
 207        }
 208
 209        ring->base_addr = ALIGN(ring->base_addr_unaligned,
 210                ring->base_align);
 211        ring->descs = (u8 *)ring->descs_unaligned +
 212                (ring->base_addr - ring->base_addr_unaligned);
 213
 214        vnic_dev_clear_desc_ring(ring);
 215
 216        ring->desc_avail = ring->desc_count - 1;
 217
 218        return 0;
 219}
 220
 221void vnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring)
 222{
 223        if (ring->descs) {
 224                pci_free_consistent(vdev->pdev,
 225                        ring->size_unaligned,
 226                        ring->descs_unaligned,
 227                        ring->base_addr_unaligned);
 228                ring->descs = NULL;
 229        }
 230}
 231
 232int vnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd,
 233        u64 *a0, u64 *a1, int wait)
 234{
 235        struct vnic_devcmd __iomem *devcmd = vdev->devcmd;
 236        int delay;
 237        u32 status;
 238        int dev_cmd_err[] = {
 239                /* convert from fw's version of error.h to host's version */
 240                0,      /* ERR_SUCCESS */
 241                EINVAL, /* ERR_EINVAL */
 242                EFAULT, /* ERR_EFAULT */
 243                EPERM,  /* ERR_EPERM */
 244                EBUSY,  /* ERR_EBUSY */
 245        };
 246        int err;
 247
 248        status = ioread32(&devcmd->status);
 249        if (status & STAT_BUSY) {
 250                printk(KERN_ERR "Busy devcmd %d\n", _CMD_N(cmd));
 251                return -EBUSY;
 252        }
 253
 254        if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) {
 255                writeq(*a0, &devcmd->args[0]);
 256                writeq(*a1, &devcmd->args[1]);
 257                wmb();
 258        }
 259
 260        iowrite32(cmd, &devcmd->cmd);
 261
 262        if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT))
 263                        return 0;
 264
 265        for (delay = 0; delay < wait; delay++) {
 266
 267                udelay(100);
 268
 269                status = ioread32(&devcmd->status);
 270                if (!(status & STAT_BUSY)) {
 271
 272                        if (status & STAT_ERROR) {
 273                                err = dev_cmd_err[(int)readq(&devcmd->args[0])];
 274                                printk(KERN_ERR "Error %d devcmd %d\n",
 275                                        err, _CMD_N(cmd));
 276                                return -err;
 277                        }
 278
 279                        if (_CMD_DIR(cmd) & _CMD_DIR_READ) {
 280                                rmb();
 281                                *a0 = readq(&devcmd->args[0]);
 282                                *a1 = readq(&devcmd->args[1]);
 283                        }
 284
 285                        return 0;
 286                }
 287        }
 288
 289        printk(KERN_ERR "Timedout devcmd %d\n", _CMD_N(cmd));
 290        return -ETIMEDOUT;
 291}
 292
 293int vnic_dev_fw_info(struct vnic_dev *vdev,
 294        struct vnic_devcmd_fw_info **fw_info)
 295{
 296        u64 a0, a1 = 0;
 297        int wait = 1000;
 298        int err = 0;
 299
 300        if (!vdev->fw_info) {
 301                vdev->fw_info = pci_alloc_consistent(vdev->pdev,
 302                        sizeof(struct vnic_devcmd_fw_info),
 303                        &vdev->fw_info_pa);
 304                if (!vdev->fw_info)
 305                        return -ENOMEM;
 306
 307                a0 = vdev->fw_info_pa;
 308
 309                /* only get fw_info once and cache it */
 310                err = vnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait);
 311        }
 312
 313        *fw_info = vdev->fw_info;
 314
 315        return err;
 316}
 317
 318int vnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, unsigned int size,
 319        void *value)
 320{
 321        u64 a0, a1;
 322        int wait = 1000;
 323        int err;
 324
 325        a0 = offset;
 326        a1 = size;
 327
 328        err = vnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait);
 329
 330        switch (size) {
 331        case 1:
 332                *(u8 *)value = (u8)a0;
 333                break;
 334        case 2:
 335                *(u16 *)value = (u16)a0;
 336                break;
 337        case 4:
 338                *(u32 *)value = (u32)a0;
 339                break;
 340        case 8:
 341                *(u64 *)value = a0;
 342                break;
 343        default:
 344                BUG();
 345                break;
 346        }
 347
 348        return err;
 349}
 350
 351int vnic_dev_stats_clear(struct vnic_dev *vdev)
 352{
 353        u64 a0 = 0, a1 = 0;
 354        int wait = 1000;
 355        return vnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait);
 356}
 357
 358int vnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats)
 359{
 360        u64 a0, a1;
 361        int wait = 1000;
 362
 363        if (!vdev->stats) {
 364                vdev->stats = pci_alloc_consistent(vdev->pdev,
 365                        sizeof(struct vnic_stats), &vdev->stats_pa);
 366                if (!vdev->stats)
 367                        return -ENOMEM;
 368        }
 369
 370        *stats = vdev->stats;
 371        a0 = vdev->stats_pa;
 372        a1 = sizeof(struct vnic_stats);
 373
 374        return vnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait);
 375}
 376
 377int vnic_dev_close(struct vnic_dev *vdev)
 378{
 379        u64 a0 = 0, a1 = 0;
 380        int wait = 1000;
 381        return vnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait);
 382}
 383
 384int vnic_dev_enable(struct vnic_dev *vdev)
 385{
 386        u64 a0 = 0, a1 = 0;
 387        int wait = 1000;
 388        return vnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait);
 389}
 390
 391int vnic_dev_disable(struct vnic_dev *vdev)
 392{
 393        u64 a0 = 0, a1 = 0;
 394        int wait = 1000;
 395        return vnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait);
 396}
 397
 398int vnic_dev_open(struct vnic_dev *vdev, int arg)
 399{
 400        u64 a0 = (u32)arg, a1 = 0;
 401        int wait = 1000;
 402        return vnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait);
 403}
 404
 405int vnic_dev_open_done(struct vnic_dev *vdev, int *done)
 406{
 407        u64 a0 = 0, a1 = 0;
 408        int wait = 1000;
 409        int err;
 410
 411        *done = 0;
 412
 413        err = vnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait);
 414        if (err)
 415                return err;
 416
 417        *done = (a0 == 0);
 418
 419        return 0;
 420}
 421
 422int vnic_dev_soft_reset(struct vnic_dev *vdev, int arg)
 423{
 424        u64 a0 = (u32)arg, a1 = 0;
 425        int wait = 1000;
 426        return vnic_dev_cmd(vdev, CMD_SOFT_RESET, &a0, &a1, wait);
 427}
 428
 429int vnic_dev_soft_reset_done(struct vnic_dev *vdev, int *done)
 430{
 431        u64 a0 = 0, a1 = 0;
 432        int wait = 1000;
 433        int err;
 434
 435        *done = 0;
 436
 437        err = vnic_dev_cmd(vdev, CMD_SOFT_RESET_STATUS, &a0, &a1, wait);
 438        if (err)
 439                return err;
 440
 441        *done = (a0 == 0);
 442
 443        return 0;
 444}
 445
 446int vnic_dev_hang_notify(struct vnic_dev *vdev)
 447{
 448        u64 a0, a1;
 449        int wait = 1000;
 450        return vnic_dev_cmd(vdev, CMD_HANG_NOTIFY, &a0, &a1, wait);
 451}
 452
 453int vnic_dev_mac_addr(struct vnic_dev *vdev, u8 *mac_addr)
 454{
 455        u64 a0, a1;
 456        int wait = 1000;
 457        int err, i;
 458
 459        for (i = 0; i < ETH_ALEN; i++)
 460                mac_addr[i] = 0;
 461
 462        err = vnic_dev_cmd(vdev, CMD_MAC_ADDR, &a0, &a1, wait);
 463        if (err)
 464                return err;
 465
 466        for (i = 0; i < ETH_ALEN; i++)
 467                mac_addr[i] = ((u8 *)&a0)[i];
 468
 469        return 0;
 470}
 471
 472void vnic_dev_packet_filter(struct vnic_dev *vdev, int directed, int multicast,
 473        int broadcast, int promisc, int allmulti)
 474{
 475        u64 a0, a1 = 0;
 476        int wait = 1000;
 477        int err;
 478
 479        a0 = (directed ? CMD_PFILTER_DIRECTED : 0) |
 480             (multicast ? CMD_PFILTER_MULTICAST : 0) |
 481             (broadcast ? CMD_PFILTER_BROADCAST : 0) |
 482             (promisc ? CMD_PFILTER_PROMISCUOUS : 0) |
 483             (allmulti ? CMD_PFILTER_ALL_MULTICAST : 0);
 484
 485        err = vnic_dev_cmd(vdev, CMD_PACKET_FILTER, &a0, &a1, wait);
 486        if (err)
 487                printk(KERN_ERR "Can't set packet filter\n");
 488}
 489
 490void vnic_dev_add_addr(struct vnic_dev *vdev, u8 *addr)
 491{
 492        u64 a0 = 0, a1 = 0;
 493        int wait = 1000;
 494        int err;
 495        int i;
 496
 497        for (i = 0; i < ETH_ALEN; i++)
 498                ((u8 *)&a0)[i] = addr[i];
 499
 500        err = vnic_dev_cmd(vdev, CMD_ADDR_ADD, &a0, &a1, wait);
 501        if (err)
 502                printk(KERN_ERR
 503                        "Can't add addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
 504                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
 505                        err);
 506}
 507
 508void vnic_dev_del_addr(struct vnic_dev *vdev, u8 *addr)
 509{
 510        u64 a0 = 0, a1 = 0;
 511        int wait = 1000;
 512        int err;
 513        int i;
 514
 515        for (i = 0; i < ETH_ALEN; i++)
 516                ((u8 *)&a0)[i] = addr[i];
 517
 518        err = vnic_dev_cmd(vdev, CMD_ADDR_DEL, &a0, &a1, wait);
 519        if (err)
 520                printk(KERN_ERR
 521                        "Can't del addr [%02x:%02x:%02x:%02x:%02x:%02x], %d\n",
 522                        addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
 523                        err);
 524}
 525
 526int vnic_dev_notify_set(struct vnic_dev *vdev, u16 intr)
 527{
 528        u64 a0, a1;
 529        int wait = 1000;
 530
 531        if (!vdev->notify) {
 532                vdev->notify = pci_alloc_consistent(vdev->pdev,
 533                        sizeof(struct vnic_devcmd_notify),
 534                        &vdev->notify_pa);
 535                if (!vdev->notify)
 536                        return -ENOMEM;
 537        }
 538
 539        a0 = vdev->notify_pa;
 540        a1 = ((u64)intr << 32) & 0x0000ffff00000000ULL;
 541        a1 += sizeof(struct vnic_devcmd_notify);
 542
 543        return vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 544}
 545
 546void vnic_dev_notify_unset(struct vnic_dev *vdev)
 547{
 548        u64 a0, a1;
 549        int wait = 1000;
 550
 551        a0 = 0;  /* paddr = 0 to unset notify buffer */
 552        a1 = 0x0000ffff00000000ULL; /* intr num = -1 to unreg for intr */
 553        a1 += sizeof(struct vnic_devcmd_notify);
 554
 555        vnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait);
 556}
 557
 558static int vnic_dev_notify_ready(struct vnic_dev *vdev)
 559{
 560        u32 *words;
 561        unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4;
 562        unsigned int i;
 563        u32 csum;
 564
 565        if (!vdev->notify)
 566                return 0;
 567
 568        do {
 569                csum = 0;
 570                memcpy(&vdev->notify_copy, vdev->notify,
 571                        sizeof(struct vnic_devcmd_notify));
 572                words = (u32 *)&vdev->notify_copy;
 573                for (i = 1; i < nwords; i++)
 574                        csum += words[i];
 575        } while (csum != words[0]);
 576
 577        return 1;
 578}
 579
 580int vnic_dev_init(struct vnic_dev *vdev, int arg)
 581{
 582        u64 a0 = (u32)arg, a1 = 0;
 583        int wait = 1000;
 584        return vnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait);
 585}
 586
 587int vnic_dev_link_status(struct vnic_dev *vdev)
 588{
 589        if (vdev->linkstatus)
 590                return *vdev->linkstatus;
 591
 592        if (!vnic_dev_notify_ready(vdev))
 593                return 0;
 594
 595        return vdev->notify_copy.link_state;
 596}
 597
 598u32 vnic_dev_port_speed(struct vnic_dev *vdev)
 599{
 600        if (!vnic_dev_notify_ready(vdev))
 601                return 0;
 602
 603        return vdev->notify_copy.port_speed;
 604}
 605
 606u32 vnic_dev_msg_lvl(struct vnic_dev *vdev)
 607{
 608        if (!vnic_dev_notify_ready(vdev))
 609                return 0;
 610
 611        return vdev->notify_copy.msglvl;
 612}
 613
 614u32 vnic_dev_mtu(struct vnic_dev *vdev)
 615{
 616        if (!vnic_dev_notify_ready(vdev))
 617                return 0;
 618
 619        return vdev->notify_copy.mtu;
 620}
 621
 622u32 vnic_dev_link_down_cnt(struct vnic_dev *vdev)
 623{
 624        if (!vnic_dev_notify_ready(vdev))
 625                return 0;
 626
 627        return vdev->notify_copy.link_down_cnt;
 628}
 629
 630void vnic_dev_set_intr_mode(struct vnic_dev *vdev,
 631        enum vnic_dev_intr_mode intr_mode)
 632{
 633        vdev->intr_mode = intr_mode;
 634}
 635
 636enum vnic_dev_intr_mode vnic_dev_get_intr_mode(
 637        struct vnic_dev *vdev)
 638{
 639        return vdev->intr_mode;
 640}
 641
 642void vnic_dev_unregister(struct vnic_dev *vdev)
 643{
 644        if (vdev) {
 645                if (vdev->notify)
 646                        pci_free_consistent(vdev->pdev,
 647                                sizeof(struct vnic_devcmd_notify),
 648                                vdev->notify,
 649                                vdev->notify_pa);
 650                if (vdev->linkstatus)
 651                        pci_free_consistent(vdev->pdev,
 652                                sizeof(u32),
 653                                vdev->linkstatus,
 654                                vdev->linkstatus_pa);
 655                if (vdev->stats)
 656                        pci_free_consistent(vdev->pdev,
 657                                sizeof(struct vnic_stats),
 658                                vdev->stats, vdev->stats_pa);
 659                if (vdev->fw_info)
 660                        pci_free_consistent(vdev->pdev,
 661                                sizeof(struct vnic_devcmd_fw_info),
 662                                vdev->fw_info, vdev->fw_info_pa);
 663                kfree(vdev);
 664        }
 665}
 666
 667struct vnic_dev *vnic_dev_register(struct vnic_dev *vdev,
 668        void *priv, struct pci_dev *pdev, struct vnic_dev_bar *bar)
 669{
 670        if (!vdev) {
 671                vdev = kzalloc(sizeof(struct vnic_dev), GFP_KERNEL);
 672                if (!vdev)
 673                        return NULL;
 674        }
 675
 676        vdev->priv = priv;
 677        vdev->pdev = pdev;
 678
 679        if (vnic_dev_discover_res(vdev, bar))
 680                goto err_out;
 681
 682        vdev->devcmd = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD, 0);
 683        if (!vdev->devcmd)
 684                goto err_out;
 685
 686        return vdev;
 687
 688err_out:
 689        vnic_dev_unregister(vdev);
 690        return NULL;
 691}
 692