drivers/net/hyperv/netvsc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * Authors:
   6  *   Haiyang Zhang <haiyangz@microsoft.com>
   7  *   Hank Janssen  <hjanssen@microsoft.com>
   8  */
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/wait.h>
  14 #include <linux/mm.h>
  15 #include <linux/delay.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/prefetch.h>
  23 #include <linux/filter.h>
  24
  25 #include <asm/sync_bitops.h>
  26 #include <asm/mshyperv.h>
  27
  28 #include "hyperv_net.h"
  29 #include "netvsc_trace.h"
  30
  31 /*
  32  * Switch the data path from the synthetic interface to the VF
  33  * interface.
  34  */
  35 int netvsc_switch_datapath(struct net_device *ndev, bool vf)
  36 {
  37         struct net_device_context *net_device_ctx = netdev_priv(ndev);
  38         struct hv_device *dev = net_device_ctx->device_ctx;
  39         struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
  40         struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
  41         int ret, retry = 0;
  42
  43         /* Block sending traffic to VF if it's about to be gone */
  44         if (!vf)
  45                 net_device_ctx->data_path_is_vf = vf;
  46
  47         memset(init_pkt, 0, sizeof(struct nvsp_message));
  48         init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
  49         if (vf)
  50                 init_pkt->msg.v4_msg.active_dp.active_datapath =
  51                         NVSP_DATAPATH_VF;
  52         else
  53                 init_pkt->msg.v4_msg.active_dp.active_datapath =
  54                         NVSP_DATAPATH_SYNTHETIC;
  55
  56 again:
  57         trace_nvsp_send(ndev, init_pkt);
  58
  59         ret = vmbus_sendpacket(dev->channel, init_pkt,
  60                                sizeof(struct nvsp_message),
  61                                (unsigned long)init_pkt, VM_PKT_DATA_INBAND,
  62                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
  63
  64         /* If failed to switch to/from VF, let data_path_is_vf stay false,
  65          * so we use synthetic path to send data.
  66          */
  67         if (ret) {
  68                 if (ret != -EAGAIN) {
  69                         netdev_err(ndev,
  70                                    "Unable to send sw datapath msg, err: %d\n",
  71                                    ret);
  72                         return ret;
  73                 }
  74
  75                 if (retry++ < RETRY_MAX) {
  76                         usleep_range(RETRY_US_LO, RETRY_US_HI);
  77                         goto again;
  78                 } else {
  79                         netdev_err(
  80                                 ndev,
  81                                 "Retry failed to send sw datapath msg, err: %d\n",
  82                                 ret);
  83                         return ret;
  84                 }
  85         }
  86
  87         wait_for_completion(&nv_dev->channel_init_wait);
  88         net_device_ctx->data_path_is_vf = vf;
  89
  90         return 0;
  91 }
  92
  93 /* Worker to setup sub channels on initial setup
  94  * Initial hotplug event occurs in softirq context
  95  * and can't wait for channels.
  96  */
  97 static void netvsc_subchan_work(struct work_struct *w)
  98 {
  99         struct netvsc_device *nvdev =
 100                 container_of(w, struct netvsc_device, subchan_work);
 101         struct rndis_device *rdev;
 102         int i, ret;
 103
 104         /* Avoid deadlock with device removal already under RTNL */
 105         if (!rtnl_trylock()) {
 106                 schedule_work(w);
 107                 return;
 108         }
 109
 110         rdev = nvdev->extension;
 111         if (rdev) {
 112                 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
 113                 if (ret == 0) {
 114                         netif_device_attach(rdev->ndev);
 115                 } else {
 116                         /* fallback to only primary channel */
 117                         for (i = 1; i < nvdev->num_chn; i++)
 118                                 netif_napi_del(&nvdev->chan_table[i].napi);
 119
 120                         nvdev->max_chn = 1;
 121                         nvdev->num_chn = 1;
 122                 }
 123         }
 124
 125         rtnl_unlock();
 126 }
 127
 128 static struct netvsc_device *alloc_net_device(void)
 129 {
 130         struct netvsc_device *net_device;
 131
 132         net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
 133         if (!net_device)
 134                 return NULL;
 135
 136         init_waitqueue_head(&net_device->wait_drain);
 137         net_device->destroy = false;
 138         net_device->tx_disable = true;
 139
 140         net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
 141         net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
 142
 143         init_completion(&net_device->channel_init_wait);
 144         init_waitqueue_head(&net_device->subchan_open);
 145         INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
 146
 147         return net_device;
 148 }
 149
 150 static void free_netvsc_device(struct rcu_head *head)
 151 {
 152         struct netvsc_device *nvdev
 153                 = container_of(head, struct netvsc_device, rcu);
 154         int i;
 155
 156         kfree(nvdev->extension);
 157         vfree(nvdev->recv_buf);
 158         vfree(nvdev->send_buf);
 159         bitmap_free(nvdev->send_section_map);
 160
 161         for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
 162                 xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
 163                 kfree(nvdev->chan_table[i].recv_buf);
 164                 vfree(nvdev->chan_table[i].mrc.slots);
 165         }
 166
 167         kfree(nvdev);
 168 }
 169
 170 static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
 171 {
 172         call_rcu(&nvdev->rcu, free_netvsc_device);
 173 }
 174
 175 static void netvsc_revoke_recv_buf(struct hv_device *device,
 176                                    struct netvsc_device *net_device,
 177                                    struct net_device *ndev)
 178 {
 179         struct nvsp_message *revoke_packet;
 180         int ret;
 181
 182         /*
 183          * If we got a section count, it means we received a
 184          * SendReceiveBufferComplete msg (ie sent
 185          * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
 186          * to send a revoke msg here
 187          */
 188         if (net_device->recv_section_cnt) {
 189                 /* Send the revoke receive buffer */
 190                 revoke_packet = &net_device->revoke_packet;
 191                 memset(revoke_packet, 0, sizeof(struct nvsp_message));
 192
 193                 revoke_packet->hdr.msg_type =
 194                         NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
 195                 revoke_packet->msg.v1_msg.
 196                 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 197
 198                 trace_nvsp_send(ndev, revoke_packet);
 199
 200                 ret = vmbus_sendpacket(device->channel,
 201                                        revoke_packet,
 202                                        sizeof(struct nvsp_message),
 203                                        VMBUS_RQST_ID_NO_RESPONSE,
 204                                        VM_PKT_DATA_INBAND, 0);
 205                 /* If the failure is because the channel is rescinded;
 206                  * ignore the failure since we cannot send on a rescinded
 207                  * channel. This would allow us to properly cleanup
 208                  * even when the channel is rescinded.
 209                  */
 210                 if (device->channel->rescind)
 211                         ret = 0;
 212                 /*
 213                  * If we failed here, we might as well return and
 214                  * have a leak rather than continue and a bugchk
 215                  */
 216                 if (ret != 0) {
 217                         netdev_err(ndev, "unable to send "
 218                                 "revoke receive buffer to netvsp\n");
 219                         return;
 220                 }
 221                 net_device->recv_section_cnt = 0;
 222         }
 223 }
 224
 225 static void netvsc_revoke_send_buf(struct hv_device *device,
 226                                    struct netvsc_device *net_device,
 227                                    struct net_device *ndev)
 228 {
 229         struct nvsp_message *revoke_packet;
 230         int ret;
 231
 232         /* Deal with the send buffer we may have setup.
 233          * If we got a  send section size, it means we received a
 234          * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
 235          * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
 236          * to send a revoke msg here
 237          */
 238         if (net_device->send_section_cnt) {
 239                 /* Send the revoke receive buffer */
 240                 revoke_packet = &net_device->revoke_packet;
 241                 memset(revoke_packet, 0, sizeof(struct nvsp_message));
 242
 243                 revoke_packet->hdr.msg_type =
 244                         NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
 245                 revoke_packet->msg.v1_msg.revoke_send_buf.id =
 246                         NETVSC_SEND_BUFFER_ID;
 247
 248                 trace_nvsp_send(ndev, revoke_packet);
 249
 250                 ret = vmbus_sendpacket(device->channel,
 251                                        revoke_packet,
 252                                        sizeof(struct nvsp_message),
 253                                        VMBUS_RQST_ID_NO_RESPONSE,
 254                                        VM_PKT_DATA_INBAND, 0);
 255
 256                 /* If the failure is because the channel is rescinded;
 257                  * ignore the failure since we cannot send on a rescinded
 258                  * channel. This would allow us to properly cleanup
 259                  * even when the channel is rescinded.
 260                  */
 261                 if (device->channel->rescind)
 262                         ret = 0;
 263
 264                 /* If we failed here, we might as well return and
 265                  * have a leak rather than continue and a bugchk
 266                  */
 267                 if (ret != 0) {
 268                         netdev_err(ndev, "unable to send "
 269                                    "revoke send buffer to netvsp\n");
 270                         return;
 271                 }
 272                 net_device->send_section_cnt = 0;
 273         }
 274 }
 275
 276 static void netvsc_teardown_recv_gpadl(struct hv_device *device,
 277                                        struct netvsc_device *net_device,
 278                                        struct net_device *ndev)
 279 {
 280         int ret;
 281
 282         if (net_device->recv_buf_gpadl_handle.gpadl_handle) {
 283                 ret = vmbus_teardown_gpadl(device->channel,
 284                                            &net_device->recv_buf_gpadl_handle);
 285
 286                 /* If we failed here, we might as well return and have a leak
 287                  * rather than continue and a bugchk
 288                  */
 289                 if (ret != 0) {
 290                         netdev_err(ndev,
 291                                    "unable to teardown receive buffer's gpadl\n");
 292                         return;
 293                 }
 294         }
 295 }
 296
 297 static void netvsc_teardown_send_gpadl(struct hv_device *device,
 298                                        struct netvsc_device *net_device,
 299                                        struct net_device *ndev)
 300 {
 301         int ret;
 302
 303         if (net_device->send_buf_gpadl_handle.gpadl_handle) {
 304                 ret = vmbus_teardown_gpadl(device->channel,
 305                                            &net_device->send_buf_gpadl_handle);
 306
 307                 /* If we failed here, we might as well return and have a leak
 308                  * rather than continue and a bugchk
 309                  */
 310                 if (ret != 0) {
 311                         netdev_err(ndev,
 312                                    "unable to teardown send buffer's gpadl\n");
 313                         return;
 314                 }
 315         }
 316 }
 317
 318 int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
 319 {
 320         struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
 321         int node = cpu_to_node(nvchan->channel->target_cpu);
 322         size_t size;
 323
 324         size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
 325         nvchan->mrc.slots = vzalloc_node(size, node);
 326         if (!nvchan->mrc.slots)
 327                 nvchan->mrc.slots = vzalloc(size);
 328
 329         return nvchan->mrc.slots ? 0 : -ENOMEM;
 330 }
 331
 332 static int netvsc_init_buf(struct hv_device *device,
 333                            struct netvsc_device *net_device,
 334                            const struct netvsc_device_info *device_info)
 335 {
 336         struct nvsp_1_message_send_receive_buffer_complete *resp;
 337         struct net_device *ndev = hv_get_drvdata(device);
 338         struct nvsp_message *init_packet;
 339         unsigned int buf_size;
 340         int i, ret = 0;
 341
 342         /* Get receive buffer area. */
 343         buf_size = device_info->recv_sections * device_info->recv_section_size;
 344         buf_size = roundup(buf_size, PAGE_SIZE);
 345
 346         /* Legacy hosts only allow smaller receive buffer */
 347         if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
 348                 buf_size = min_t(unsigned int, buf_size,
 349                                  NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
 350
 351         net_device->recv_buf = vzalloc(buf_size);
 352         if (!net_device->recv_buf) {
 353                 netdev_err(ndev,
 354                            "unable to allocate receive buffer of size %u\n",
 355                            buf_size);
 356                 ret = -ENOMEM;
 357                 goto cleanup;
 358         }
 359
 360         net_device->recv_buf_size = buf_size;
 361
 362         /*
 363          * Establish the gpadl handle for this buffer on this
 364          * channel.  Note: This call uses the vmbus connection rather
 365          * than the channel to establish the gpadl handle.
 366          */
 367         ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
 368                                     buf_size,
 369                                     &net_device->recv_buf_gpadl_handle);
 370         if (ret != 0) {
 371                 netdev_err(ndev,
 372                         "unable to establish receive buffer's gpadl\n");
 373                 goto cleanup;
 374         }
 375
 376         /* Notify the NetVsp of the gpadl handle */
 377         init_packet = &net_device->channel_init_pkt;
 378         memset(init_packet, 0, sizeof(struct nvsp_message));
 379         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
 380         init_packet->msg.v1_msg.send_recv_buf.
 381                 gpadl_handle = net_device->recv_buf_gpadl_handle.gpadl_handle;
 382         init_packet->msg.v1_msg.
 383                 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
 384
 385         trace_nvsp_send(ndev, init_packet);
 386
 387         /* Send the gpadl notification request */
 388         ret = vmbus_sendpacket(device->channel, init_packet,
 389                                sizeof(struct nvsp_message),
 390                                (unsigned long)init_packet,
 391                                VM_PKT_DATA_INBAND,
 392                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 393         if (ret != 0) {
 394                 netdev_err(ndev,
 395                         "unable to send receive buffer's gpadl to netvsp\n");
 396                 goto cleanup;
 397         }
 398
 399         wait_for_completion(&net_device->channel_init_wait);
 400
 401         /* Check the response */
 402         resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
 403         if (resp->status != NVSP_STAT_SUCCESS) {
 404                 netdev_err(ndev,
 405                            "Unable to complete receive buffer initialization with NetVsp - status %d\n",
 406                            resp->status);
 407                 ret = -EINVAL;
 408                 goto cleanup;
 409         }
 410
 411         /* Parse the response */
 412         netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
 413                    resp->num_sections, resp->sections[0].sub_alloc_size,
 414                    resp->sections[0].num_sub_allocs);
 415
 416         /* There should only be one section for the entire receive buffer */
 417         if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
 418                 ret = -EINVAL;
 419                 goto cleanup;
 420         }
 421
 422         net_device->recv_section_size = resp->sections[0].sub_alloc_size;
 423         net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
 424
 425         /* Ensure buffer will not overflow */
 426         if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size *
 427             (u64)net_device->recv_section_cnt > (u64)buf_size) {
 428                 netdev_err(ndev, "invalid recv_section_size %u\n",
 429                            net_device->recv_section_size);
 430                 ret = -EINVAL;
 431                 goto cleanup;
 432         }
 433
 434         for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
 435                 struct netvsc_channel *nvchan = &net_device->chan_table[i];
 436
 437                 nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL);
 438                 if (nvchan->recv_buf == NULL) {
 439                         ret = -ENOMEM;
 440                         goto cleanup;
 441                 }
 442         }
 443
 444         /* Setup receive completion ring.
 445          * Add 1 to the recv_section_cnt because at least one entry in a
 446          * ring buffer has to be empty.
 447          */
 448         net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
 449         ret = netvsc_alloc_recv_comp_ring(net_device, 0);
 450         if (ret)
 451                 goto cleanup;
 452
 453         /* Now setup the send buffer. */
 454         buf_size = device_info->send_sections * device_info->send_section_size;
 455         buf_size = round_up(buf_size, PAGE_SIZE);
 456
 457         net_device->send_buf = vzalloc(buf_size);
 458         if (!net_device->send_buf) {
 459                 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
 460                            buf_size);
 461                 ret = -ENOMEM;
 462                 goto cleanup;
 463         }
 464         net_device->send_buf_size = buf_size;
 465
 466         /* Establish the gpadl handle for this buffer on this
 467          * channel.  Note: This call uses the vmbus connection rather
 468          * than the channel to establish the gpadl handle.
 469          */
 470         ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
 471                                     buf_size,
 472                                     &net_device->send_buf_gpadl_handle);
 473         if (ret != 0) {
 474                 netdev_err(ndev,
 475                            "unable to establish send buffer's gpadl\n");
 476                 goto cleanup;
 477         }
 478
 479         /* Notify the NetVsp of the gpadl handle */
 480         init_packet = &net_device->channel_init_pkt;
 481         memset(init_packet, 0, sizeof(struct nvsp_message));
 482         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
 483         init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
 484                 net_device->send_buf_gpadl_handle.gpadl_handle;
 485         init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
 486
 487         trace_nvsp_send(ndev, init_packet);
 488
 489         /* Send the gpadl notification request */
 490         ret = vmbus_sendpacket(device->channel, init_packet,
 491                                sizeof(struct nvsp_message),
 492                                (unsigned long)init_packet,
 493                                VM_PKT_DATA_INBAND,
 494                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 495         if (ret != 0) {
 496                 netdev_err(ndev,
 497                            "unable to send send buffer's gpadl to netvsp\n");
 498                 goto cleanup;
 499         }
 500
 501         wait_for_completion(&net_device->channel_init_wait);
 502
 503         /* Check the response */
 504         if (init_packet->msg.v1_msg.
 505             send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
 506                 netdev_err(ndev, "Unable to complete send buffer "
 507                            "initialization with NetVsp - status %d\n",
 508                            init_packet->msg.v1_msg.
 509                            send_send_buf_complete.status);
 510                 ret = -EINVAL;
 511                 goto cleanup;
 512         }
 513
 514         /* Parse the response */
 515         net_device->send_section_size = init_packet->msg.
 516                                 v1_msg.send_send_buf_complete.section_size;
 517         if (net_device->send_section_size < NETVSC_MTU_MIN) {
 518                 netdev_err(ndev, "invalid send_section_size %u\n",
 519                            net_device->send_section_size);
 520                 ret = -EINVAL;
 521                 goto cleanup;
 522         }
 523
 524         /* Section count is simply the size divided by the section size. */
 525         net_device->send_section_cnt = buf_size / net_device->send_section_size;
 526
 527         netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
 528                    net_device->send_section_size, net_device->send_section_cnt);
 529
 530         /* Setup state for managing the send buffer. */
 531         net_device->send_section_map = bitmap_zalloc(net_device->send_section_cnt,
 532                                                      GFP_KERNEL);
 533         if (!net_device->send_section_map) {
 534                 ret = -ENOMEM;
 535                 goto cleanup;
 536         }
 537
 538         goto exit;
 539
 540 cleanup:
 541         netvsc_revoke_recv_buf(device, net_device, ndev);
 542         netvsc_revoke_send_buf(device, net_device, ndev);
 543         netvsc_teardown_recv_gpadl(device, net_device, ndev);
 544         netvsc_teardown_send_gpadl(device, net_device, ndev);
 545
 546 exit:
 547         return ret;
 548 }
 549
 550 /* Negotiate NVSP protocol version */
 551 static int negotiate_nvsp_ver(struct hv_device *device,
 552                               struct netvsc_device *net_device,
 553                               struct nvsp_message *init_packet,
 554                               u32 nvsp_ver)
 555 {
 556         struct net_device *ndev = hv_get_drvdata(device);
 557         int ret;
 558
 559         memset(init_packet, 0, sizeof(struct nvsp_message));
 560         init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
 561         init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
 562         init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
 563         trace_nvsp_send(ndev, init_packet);
 564
 565         /* Send the init request */
 566         ret = vmbus_sendpacket(device->channel, init_packet,
 567                                sizeof(struct nvsp_message),
 568                                (unsigned long)init_packet,
 569                                VM_PKT_DATA_INBAND,
 570                                VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
 571
 572         if (ret != 0)
 573                 return ret;
 574
 575         wait_for_completion(&net_device->channel_init_wait);
 576
 577         if (init_packet->msg.init_msg.init_complete.status !=
 578             NVSP_STAT_SUCCESS)
 579                 return -EINVAL;
 580
 581         if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
 582                 return 0;
 583
 584         /* NVSPv2 or later: Send NDIS config */
 585         memset(init_packet, 0, sizeof(struct nvsp_message));
 586         init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
 587         init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
 588         init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
 589
 590         if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
 591                 if (hv_is_isolation_supported())
 592                         netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n");
 593                 else
 594                         init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
 595
 596                 /* Teaming bit is needed to receive link speed updates */
 597                 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
 598         }
 599
 600         if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
 601                 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
 602
 603         trace_nvsp_send(ndev, init_packet);
 604
 605         ret = vmbus_sendpacket(device->channel, init_packet,
 606                                 sizeof(struct nvsp_message),
 607                                 VMBUS_RQST_ID_NO_RESPONSE,
 608                                 VM_PKT_DATA_INBAND, 0);
 609
 610         return ret;
 611 }
 612
 613 static int netvsc_connect_vsp(struct hv_device *device,
 614                               struct netvsc_device *net_device,
 615                               const struct netvsc_device_info *device_info)
 616 {
 617         struct net_device *ndev = hv_get_drvdata(device);
 618         static const u32 ver_list[] = {
 619                 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
 620                 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
 621                 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
 622         };
 623         struct nvsp_message *init_packet;
 624         int ndis_version, i, ret;
 625
 626         init_packet = &net_device->channel_init_pkt;
 627
 628         /* Negotiate the latest NVSP protocol supported */
 629         for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
 630                 if (negotiate_nvsp_ver(device, net_device, init_packet,
 631                                        ver_list[i])  == 0) {
 632                         net_device->nvsp_version = ver_list[i];
 633                         break;
 634                 }
 635
 636         if (i < 0) {
 637                 ret = -EPROTO;
 638                 goto cleanup;
 639         }
 640
 641         if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) {
 642                 netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n",
 643                            net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61);
 644                 ret = -EPROTO;
 645                 goto cleanup;
 646         }
 647
 648         pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
 649
 650         /* Send the ndis version */
 651         memset(init_packet, 0, sizeof(struct nvsp_message));
 652
 653         if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
 654                 ndis_version = 0x00060001;
 655         else
 656                 ndis_version = 0x0006001e;
 657
 658         init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
 659         init_packet->msg.v1_msg.
 660                 send_ndis_ver.ndis_major_ver =
 661                                 (ndis_version & 0xFFFF0000) >> 16;
 662         init_packet->msg.v1_msg.
 663                 send_ndis_ver.ndis_minor_ver =
 664                                 ndis_version & 0xFFFF;
 665
 666         trace_nvsp_send(ndev, init_packet);
 667
 668         /* Send the init request */
 669         ret = vmbus_sendpacket(device->channel, init_packet,
 670                                 sizeof(struct nvsp_message),
 671                                 VMBUS_RQST_ID_NO_RESPONSE,
 672                                 VM_PKT_DATA_INBAND, 0);
 673         if (ret != 0)
 674                 goto cleanup;
 675
 676
 677         ret = netvsc_init_buf(device, net_device, device_info);
 678
 679 cleanup:
 680         return ret;
 681 }
 682
 683 /*
 684  * netvsc_device_remove - Callback when the root bus device is removed
 685  */
 686 void netvsc_device_remove(struct hv_device *device)
 687 {
 688         struct net_device *ndev = hv_get_drvdata(device);
 689         struct net_device_context *net_device_ctx = netdev_priv(ndev);
 690         struct netvsc_device *net_device
 691                 = rtnl_dereference(net_device_ctx->nvdev);
 692         int i;
 693
 694         /*
 695          * Revoke receive buffer. If host is pre-Win2016 then tear down
 696          * receive buffer GPADL. Do the same for send buffer.
 697          */
 698         netvsc_revoke_recv_buf(device, net_device, ndev);
 699         if (vmbus_proto_version < VERSION_WIN10)
 700                 netvsc_teardown_recv_gpadl(device, net_device, ndev);
 701
 702         netvsc_revoke_send_buf(device, net_device, ndev);
 703         if (vmbus_proto_version < VERSION_WIN10)
 704                 netvsc_teardown_send_gpadl(device, net_device, ndev);
 705
 706         RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
 707
 708         /* Disable NAPI and disassociate its context from the device. */
 709         for (i = 0; i < net_device->num_chn; i++) {
 710                 /* See also vmbus_reset_channel_cb(). */
 711                 /* only disable enabled NAPI channel */
 712                 if (i < ndev->real_num_rx_queues)
 713                         napi_disable(&net_device->chan_table[i].napi);
 714
 715                 netif_napi_del(&net_device->chan_table[i].napi);
 716         }
 717
 718         /*
 719          * At this point, no one should be accessing net_device
 720          * except in here
 721          */
 722         netdev_dbg(ndev, "net device safe to remove\n");
 723
 724         /* Now, we can close the channel safely */
 725         vmbus_close(device->channel);
 726
 727         /*
 728          * If host is Win2016 or higher then we do the GPADL tear down
 729          * here after VMBus is closed.
 730         */
 731         if (vmbus_proto_version >= VERSION_WIN10) {
 732                 netvsc_teardown_recv_gpadl(device, net_device, ndev);
 733                 netvsc_teardown_send_gpadl(device, net_device, ndev);
 734         }
 735
 736         /* Release all resources */
 737         free_netvsc_device_rcu(net_device);
 738 }
 739
 740 #define RING_AVAIL_PERCENT_HIWATER 20
 741 #define RING_AVAIL_PERCENT_LOWATER 10
 742
 743 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
 744                                          u32 index)
 745 {
 746         sync_change_bit(index, net_device->send_section_map);
 747 }
 748
 749 static void netvsc_send_tx_complete(struct net_device *ndev,
 750                                     struct netvsc_device *net_device,
 751                                     struct vmbus_channel *channel,
 752                                     const struct vmpacket_descriptor *desc,
 753                                     int budget)
 754 {
 755         struct net_device_context *ndev_ctx = netdev_priv(ndev);
 756         struct sk_buff *skb;
 757         u16 q_idx = 0;
 758         int queue_sends;
 759         u64 cmd_rqst;
 760
 761         cmd_rqst = channel->request_addr_callback(channel, desc->trans_id);
 762         if (cmd_rqst == VMBUS_RQST_ERROR) {
 763                 netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
 764                 return;
 765         }
 766
 767         skb = (struct sk_buff *)(unsigned long)cmd_rqst;
 768
 769         /* Notify the layer above us */
 770         if (likely(skb)) {
 771                 struct hv_netvsc_packet *packet
 772                         = (struct hv_netvsc_packet *)skb->cb;
 773                 u32 send_index = packet->send_buf_index;
 774                 struct netvsc_stats_tx *tx_stats;
 775
 776                 if (send_index != NETVSC_INVALID_INDEX)
 777                         netvsc_free_send_slot(net_device, send_index);
 778                 q_idx = packet->q_idx;
 779
 780                 tx_stats = &net_device->chan_table[q_idx].tx_stats;
 781
 782                 u64_stats_update_begin(&tx_stats->syncp);
 783                 tx_stats->packets += packet->total_packets;
 784                 tx_stats->bytes += packet->total_bytes;
 785                 u64_stats_update_end(&tx_stats->syncp);
 786
 787                 netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
 788                 napi_consume_skb(skb, budget);
 789         }
 790
 791         queue_sends =
 792                 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
 793
 794         if (unlikely(net_device->destroy)) {
 795                 if (queue_sends == 0)
 796                         wake_up(&net_device->wait_drain);
 797         } else {
 798                 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
 799
 800                 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
 801                     (hv_get_avail_to_write_percent(&channel->outbound) >
 802                      RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
 803                         netif_tx_wake_queue(txq);
 804                         ndev_ctx->eth_stats.wake_queue++;
 805                 }
 806         }
 807 }
 808
 809 static void netvsc_send_completion(struct net_device *ndev,
 810                                    struct netvsc_device *net_device,
 811                                    struct vmbus_channel *incoming_channel,
 812                                    const struct vmpacket_descriptor *desc,
 813                                    int budget)
 814 {
 815         const struct nvsp_message *nvsp_packet;
 816         u32 msglen = hv_pkt_datalen(desc);
 817         struct nvsp_message *pkt_rqst;
 818         u64 cmd_rqst;
 819         u32 status;
 820
 821         /* First check if this is a VMBUS completion without data payload */
 822         if (!msglen) {
 823                 cmd_rqst = incoming_channel->request_addr_callback(incoming_channel,
 824                                                                    desc->trans_id);
 825                 if (cmd_rqst == VMBUS_RQST_ERROR) {
 826                         netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
 827                         return;
 828                 }
 829
 830                 pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst;
 831                 switch (pkt_rqst->hdr.msg_type) {
 832                 case NVSP_MSG4_TYPE_SWITCH_DATA_PATH:
 833                         complete(&net_device->channel_init_wait);
 834                         break;
 835
 836                 default:
 837                         netdev_err(ndev, "Unexpected VMBUS completion!!\n");
 838                 }
 839                 return;
 840         }
 841
 842         /* Ensure packet is big enough to read header fields */
 843         if (msglen < sizeof(struct nvsp_message_header)) {
 844                 netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
 845                 return;
 846         }
 847
 848         nvsp_packet = hv_pkt_data(desc);
 849         switch (nvsp_packet->hdr.msg_type) {
 850         case NVSP_MSG_TYPE_INIT_COMPLETE:
 851                 if (msglen < sizeof(struct nvsp_message_header) +
 852                                 sizeof(struct nvsp_message_init_complete)) {
 853                         netdev_err(ndev, "nvsp_msg length too small: %u\n",
 854                                    msglen);
 855                         return;
 856                 }
 857                 break;
 858
 859         case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
 860                 if (msglen < sizeof(struct nvsp_message_header) +
 861                                 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
 862                         netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
 863                                    msglen);
 864                         return;
 865                 }
 866                 break;
 867
 868         case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
 869                 if (msglen < sizeof(struct nvsp_message_header) +
 870                                 sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
 871                         netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
 872                                    msglen);
 873                         return;
 874                 }
 875                 break;
 876
 877         case NVSP_MSG5_TYPE_SUBCHANNEL:
 878                 if (msglen < sizeof(struct nvsp_message_header) +
 879                                 sizeof(struct nvsp_5_subchannel_complete)) {
 880                         netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
 881                                    msglen);
 882                         return;
 883                 }
 884                 break;
 885
 886         case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
 887                 if (msglen < sizeof(struct nvsp_message_header) +
 888                     sizeof(struct nvsp_1_message_send_rndis_packet_complete)) {
 889                         if (net_ratelimit())
 890                                 netdev_err(ndev, "nvsp_rndis_pkt_complete length too small: %u\n",
 891                                            msglen);
 892                         return;
 893                 }
 894
 895                 /* If status indicates an error, output a message so we know
 896                  * there's a problem. But process the completion anyway so the
 897                  * resources are released.
 898                  */
 899                 status = nvsp_packet->msg.v1_msg.send_rndis_pkt_complete.status;
 900                 if (status != NVSP_STAT_SUCCESS && net_ratelimit())
 901                         netdev_err(ndev, "nvsp_rndis_pkt_complete error status: %x\n",
 902                                    status);
 903
 904                 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
 905                                         desc, budget);
 906                 return;
 907
 908         default:
 909                 netdev_err(ndev,
 910                            "Unknown send completion type %d received!!\n",
 911                            nvsp_packet->hdr.msg_type);
 912                 return;
 913         }
 914
 915         /* Copy the response back */
 916         memcpy(&net_device->channel_init_pkt, nvsp_packet,
 917                sizeof(struct nvsp_message));
 918         complete(&net_device->channel_init_wait);
 919 }
 920
 921 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
 922 {
 923         unsigned long *map_addr = net_device->send_section_map;
 924         unsigned int i;
 925
 926         for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
 927                 if (sync_test_and_set_bit(i, map_addr) == 0)
 928                         return i;
 929         }
 930
 931         return NETVSC_INVALID_INDEX;
 932 }
 933
 934 static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
 935                                     unsigned int section_index,
 936                                     u32 pend_size,
 937                                     struct hv_netvsc_packet *packet,
 938                                     struct rndis_message *rndis_msg,
 939                                     struct hv_page_buffer *pb,
 940                                     bool xmit_more)
 941 {
 942         char *start = net_device->send_buf;
 943         char *dest = start + (section_index * net_device->send_section_size)
 944                      + pend_size;
 945         int i;
 946         u32 padding = 0;
 947         u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
 948                 packet->page_buf_cnt;
 949         u32 remain;
 950
 951         /* Add padding */
 952         remain = packet->total_data_buflen & (net_device->pkt_align - 1);
 953         if (xmit_more && remain) {
 954                 padding = net_device->pkt_align - remain;
 955                 rndis_msg->msg_len += padding;
 956                 packet->total_data_buflen += padding;
 957         }
 958
 959         for (i = 0; i < page_count; i++) {
 960                 char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
 961                 u32 offset = pb[i].offset;
 962                 u32 len = pb[i].len;
 963
 964                 memcpy(dest, (src + offset), len);
 965                 dest += len;
 966         }
 967
 968         if (padding)
 969                 memset(dest, 0, padding);
 970 }
 971
 972 void netvsc_dma_unmap(struct hv_device *hv_dev,
 973                       struct hv_netvsc_packet *packet)
 974 {
 975         int i;
 976
 977         if (!hv_is_isolation_supported())
 978                 return;
 979
 980         if (!packet->dma_range)
 981                 return;
 982
 983         for (i = 0; i < packet->page_buf_cnt; i++)
 984                 dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma,
 985                                  packet->dma_range[i].mapping_size,
 986                                  DMA_TO_DEVICE);
 987
 988         kfree(packet->dma_range);
 989 }
 990
 991 /* netvsc_dma_map - Map swiotlb bounce buffer with data page of
 992  * packet sent by vmbus_sendpacket_pagebuffer() in the Isolation
 993  * VM.
 994  *
 995  * In isolation VM, netvsc send buffer has been marked visible to
 996  * host and so the data copied to send buffer doesn't need to use
 997  * bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer()
 998  * may not be copied to send buffer and so these pages need to be
 999  * mapped with swiotlb bounce buffer. netvsc_dma_map() is to do
1000  * that. The pfns in the struct hv_page_buffer need to be converted
1001  * to bounce buffer's pfn. The loop here is necessary because the
1002  * entries in the page buffer array are not necessarily full
1003  * pages of data.  Each entry in the array has a separate offset and
1004  * len that may be non-zero, even for entries in the middle of the
1005  * array.  And the entries are not physically contiguous.  So each
1006  * entry must be individually mapped rather than as a contiguous unit.
1007  * So not use dma_map_sg() here.
1008  */
1009 static int netvsc_dma_map(struct hv_device *hv_dev,
1010                           struct hv_netvsc_packet *packet,
1011                           struct hv_page_buffer *pb)
1012 {
1013         u32 page_count = packet->page_buf_cnt;
1014         dma_addr_t dma;
1015         int i;
1016
1017         if (!hv_is_isolation_supported())
1018                 return 0;
1019
1020         packet->dma_range = kcalloc(page_count,
1021                                     sizeof(*packet->dma_range),
1022                                     GFP_ATOMIC);
1023         if (!packet->dma_range)
1024                 return -ENOMEM;
1025
1026         for (i = 0; i < page_count; i++) {
1027                 char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT)
1028                                          + pb[i].offset);
1029                 u32 len = pb[i].len;
1030
1031                 dma = dma_map_single(&hv_dev->device, src, len,
1032                                      DMA_TO_DEVICE);
1033                 if (dma_mapping_error(&hv_dev->device, dma)) {
1034                         kfree(packet->dma_range);
1035                         return -ENOMEM;
1036                 }
1037
1038                 /* pb[].offset and pb[].len are not changed during dma mapping
1039                  * and so not reassign.
1040                  */
1041                 packet->dma_range[i].dma = dma;
1042                 packet->dma_range[i].mapping_size = len;
1043                 pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static inline int netvsc_send_pkt(
1050         struct hv_device *device,
1051         struct hv_netvsc_packet *packet,
1052         struct netvsc_device *net_device,
1053         struct hv_page_buffer *pb,
1054         struct sk_buff *skb)
1055 {
1056         struct nvsp_message nvmsg;
1057         struct nvsp_1_message_send_rndis_packet *rpkt =
1058                 &nvmsg.msg.v1_msg.send_rndis_pkt;
1059         struct netvsc_channel * const nvchan =
1060                 &net_device->chan_table[packet->q_idx];
1061         struct vmbus_channel *out_channel = nvchan->channel;
1062         struct net_device *ndev = hv_get_drvdata(device);
1063         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1064         struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
1065         u64 req_id;
1066         int ret;
1067         u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
1068
1069         memset(&nvmsg, 0, sizeof(struct nvsp_message));
1070         nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
1071         if (skb)
1072                 rpkt->channel_type = 0;         /* 0 is RMC_DATA */
1073         else
1074                 rpkt->channel_type = 1;         /* 1 is RMC_CONTROL */
1075
1076         rpkt->send_buf_section_index = packet->send_buf_index;
1077         if (packet->send_buf_index == NETVSC_INVALID_INDEX)
1078                 rpkt->send_buf_section_size = 0;
1079         else
1080                 rpkt->send_buf_section_size = packet->total_data_buflen;
1081
1082         req_id = (ulong)skb;
1083
1084         if (out_channel->rescind)
1085                 return -ENODEV;
1086
1087         trace_nvsp_send_pkt(ndev, out_channel, rpkt);
1088
1089         packet->dma_range = NULL;
1090         if (packet->page_buf_cnt) {
1091                 if (packet->cp_partial)
1092                         pb += packet->rmsg_pgcnt;
1093
1094                 ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb);
1095                 if (ret) {
1096                         ret = -EAGAIN;
1097                         goto exit;
1098                 }
1099
1100                 ret = vmbus_sendpacket_pagebuffer(out_channel,
1101                                                   pb, packet->page_buf_cnt,
1102                                                   &nvmsg, sizeof(nvmsg),
1103                                                   req_id);
1104
1105                 if (ret)
1106                         netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
1107         } else {
1108                 ret = vmbus_sendpacket(out_channel,
1109                                        &nvmsg, sizeof(nvmsg),
1110                                        req_id, VM_PKT_DATA_INBAND,
1111                                        VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1112         }
1113
1114 exit:
1115         if (ret == 0) {
1116                 atomic_inc_return(&nvchan->queue_sends);
1117
1118                 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
1119                         netif_tx_stop_queue(txq);
1120                         ndev_ctx->eth_stats.stop_queue++;
1121                 }
1122         } else if (ret == -EAGAIN) {
1123                 netif_tx_stop_queue(txq);
1124                 ndev_ctx->eth_stats.stop_queue++;
1125         } else {
1126                 netdev_err(ndev,
1127                            "Unable to send packet pages %u len %u, ret %d\n",
1128                            packet->page_buf_cnt, packet->total_data_buflen,
1129                            ret);
1130         }
1131
1132         if (netif_tx_queue_stopped(txq) &&
1133             atomic_read(&nvchan->queue_sends) < 1 &&
1134             !net_device->tx_disable) {
1135                 netif_tx_wake_queue(txq);
1136                 ndev_ctx->eth_stats.wake_queue++;
1137                 if (ret == -EAGAIN)
1138                         ret = -ENOSPC;
1139         }
1140
1141         return ret;
1142 }
1143
1144 /* Move packet out of multi send data (msd), and clear msd */
1145 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
1146                                 struct sk_buff **msd_skb,
1147                                 struct multi_send_data *msdp)
1148 {
1149         *msd_skb = msdp->skb;
1150         *msd_send = msdp->pkt;
1151         msdp->skb = NULL;
1152         msdp->pkt = NULL;
1153         msdp->count = 0;
1154 }
1155
1156 /* RCU already held by caller */
1157 /* Batching/bouncing logic is designed to attempt to optimize
1158  * performance.
1159  *
1160  * For small, non-LSO packets we copy the packet to a send buffer
1161  * which is pre-registered with the Hyper-V side. This enables the
1162  * hypervisor to avoid remapping the aperture to access the packet
1163  * descriptor and data.
1164  *
1165  * If we already started using a buffer and the netdev is transmitting
1166  * a burst of packets, keep on copying into the buffer until it is
1167  * full or we are done collecting a burst. If there is an existing
1168  * buffer with space for the RNDIS descriptor but not the packet, copy
1169  * the RNDIS descriptor to the buffer, keeping the packet in place.
1170  *
1171  * If we do batching and send more than one packet using a single
1172  * NetVSC message, free the SKBs of the packets copied, except for the
1173  * last packet. This is done to streamline the handling of the case
1174  * where the last packet only had the RNDIS descriptor copied to the
1175  * send buffer, with the data pointers included in the NetVSC message.
1176  */
1177 int netvsc_send(struct net_device *ndev,
1178                 struct hv_netvsc_packet *packet,
1179                 struct rndis_message *rndis_msg,
1180                 struct hv_page_buffer *pb,
1181                 struct sk_buff *skb,
1182                 bool xdp_tx)
1183 {
1184         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1185         struct netvsc_device *net_device
1186                 = rcu_dereference_bh(ndev_ctx->nvdev);
1187         struct hv_device *device = ndev_ctx->device_ctx;
1188         int ret = 0;
1189         struct netvsc_channel *nvchan;
1190         u32 pktlen = packet->total_data_buflen, msd_len = 0;
1191         unsigned int section_index = NETVSC_INVALID_INDEX;
1192         struct multi_send_data *msdp;
1193         struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
1194         struct sk_buff *msd_skb = NULL;
1195         bool try_batch, xmit_more;
1196
1197         /* If device is rescinded, return error and packet will get dropped. */
1198         if (unlikely(!net_device || net_device->destroy))
1199                 return -ENODEV;
1200
1201         nvchan = &net_device->chan_table[packet->q_idx];
1202         packet->send_buf_index = NETVSC_INVALID_INDEX;
1203         packet->cp_partial = false;
1204
1205         /* Send a control message or XDP packet directly without accessing
1206          * msd (Multi-Send Data) field which may be changed during data packet
1207          * processing.
1208          */
1209         if (!skb || xdp_tx)
1210                 return netvsc_send_pkt(device, packet, net_device, pb, skb);
1211
1212         /* batch packets in send buffer if possible */
1213         msdp = &nvchan->msd;
1214         if (msdp->pkt)
1215                 msd_len = msdp->pkt->total_data_buflen;
1216
1217         try_batch =  msd_len > 0 && msdp->count < net_device->max_pkt;
1218         if (try_batch && msd_len + pktlen + net_device->pkt_align <
1219             net_device->send_section_size) {
1220                 section_index = msdp->pkt->send_buf_index;
1221
1222         } else if (try_batch && msd_len + packet->rmsg_size <
1223                    net_device->send_section_size) {
1224                 section_index = msdp->pkt->send_buf_index;
1225                 packet->cp_partial = true;
1226
1227         } else if (pktlen + net_device->pkt_align <
1228                    net_device->send_section_size) {
1229                 section_index = netvsc_get_next_send_section(net_device);
1230                 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
1231                         ++ndev_ctx->eth_stats.tx_send_full;
1232                 } else {
1233                         move_pkt_msd(&msd_send, &msd_skb, msdp);
1234                         msd_len = 0;
1235                 }
1236         }
1237
1238         /* Keep aggregating only if stack says more data is coming
1239          * and not doing mixed modes send and not flow blocked
1240          */
1241         xmit_more = netdev_xmit_more() &&
1242                 !packet->cp_partial &&
1243                 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
1244
1245         if (section_index != NETVSC_INVALID_INDEX) {
1246                 netvsc_copy_to_send_buf(net_device,
1247                                         section_index, msd_len,
1248                                         packet, rndis_msg, pb, xmit_more);
1249
1250                 packet->send_buf_index = section_index;
1251
1252                 if (packet->cp_partial) {
1253                         packet->page_buf_cnt -= packet->rmsg_pgcnt;
1254                         packet->total_data_buflen = msd_len + packet->rmsg_size;
1255                 } else {
1256                         packet->page_buf_cnt = 0;
1257                         packet->total_data_buflen += msd_len;
1258                 }
1259
1260                 if (msdp->pkt) {
1261                         packet->total_packets += msdp->pkt->total_packets;
1262                         packet->total_bytes += msdp->pkt->total_bytes;
1263                 }
1264
1265                 if (msdp->skb)
1266                         dev_consume_skb_any(msdp->skb);
1267
1268                 if (xmit_more) {
1269                         msdp->skb = skb;
1270                         msdp->pkt = packet;
1271                         msdp->count++;
1272                 } else {
1273                         cur_send = packet;
1274                         msdp->skb = NULL;
1275                         msdp->pkt = NULL;
1276                         msdp->count = 0;
1277                 }
1278         } else {
1279                 move_pkt_msd(&msd_send, &msd_skb, msdp);
1280                 cur_send = packet;
1281         }
1282
1283         if (msd_send) {
1284                 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1285                                             NULL, msd_skb);
1286
1287                 if (m_ret != 0) {
1288                         netvsc_free_send_slot(net_device,
1289                                               msd_send->send_buf_index);
1290                         dev_kfree_skb_any(msd_skb);
1291                 }
1292         }
1293
1294         if (cur_send)
1295                 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1296
1297         if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1298                 netvsc_free_send_slot(net_device, section_index);
1299
1300         return ret;
1301 }
1302
1303 /* Send pending recv completions */
1304 static int send_recv_completions(struct net_device *ndev,
1305                                  struct netvsc_device *nvdev,
1306                                  struct netvsc_channel *nvchan)
1307 {
1308         struct multi_recv_comp *mrc = &nvchan->mrc;
1309         struct recv_comp_msg {
1310                 struct nvsp_message_header hdr;
1311                 u32 status;
1312         }  __packed;
1313         struct recv_comp_msg msg = {
1314                 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1315         };
1316         int ret;
1317
1318         while (mrc->first != mrc->next) {
1319                 const struct recv_comp_data *rcd
1320                         = mrc->slots + mrc->first;
1321
1322                 msg.status = rcd->status;
1323                 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1324                                        rcd->tid, VM_PKT_COMP, 0);
1325                 if (unlikely(ret)) {
1326                         struct net_device_context *ndev_ctx = netdev_priv(ndev);
1327
1328                         ++ndev_ctx->eth_stats.rx_comp_busy;
1329                         return ret;
1330                 }
1331
1332                 if (++mrc->first == nvdev->recv_completion_cnt)
1333                         mrc->first = 0;
1334         }
1335
1336         /* receive completion ring has been emptied */
1337         if (unlikely(nvdev->destroy))
1338                 wake_up(&nvdev->wait_drain);
1339
1340         return 0;
1341 }
1342
1343 /* Count how many receive completions are outstanding */
1344 static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1345                                  const struct multi_recv_comp *mrc,
1346                                  u32 *filled, u32 *avail)
1347 {
1348         u32 count = nvdev->recv_completion_cnt;
1349
1350         if (mrc->next >= mrc->first)
1351                 *filled = mrc->next - mrc->first;
1352         else
1353                 *filled = (count - mrc->first) + mrc->next;
1354
1355         *avail = count - *filled - 1;
1356 }
1357
1358 /* Add receive complete to ring to send to host. */
1359 static void enq_receive_complete(struct net_device *ndev,
1360                                  struct netvsc_device *nvdev, u16 q_idx,
1361                                  u64 tid, u32 status)
1362 {
1363         struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1364         struct multi_recv_comp *mrc = &nvchan->mrc;
1365         struct recv_comp_data *rcd;
1366         u32 filled, avail;
1367
1368         recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1369
1370         if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1371                 send_recv_completions(ndev, nvdev, nvchan);
1372                 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1373         }
1374
1375         if (unlikely(!avail)) {
1376                 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1377                            q_idx, tid);
1378                 return;
1379         }
1380
1381         rcd = mrc->slots + mrc->next;
1382         rcd->tid = tid;
1383         rcd->status = status;
1384
1385         if (++mrc->next == nvdev->recv_completion_cnt)
1386                 mrc->next = 0;
1387 }
1388
1389 static int netvsc_receive(struct net_device *ndev,
1390                           struct netvsc_device *net_device,
1391                           struct netvsc_channel *nvchan,
1392                           const struct vmpacket_descriptor *desc)
1393 {
1394         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1395         struct vmbus_channel *channel = nvchan->channel;
1396         const struct vmtransfer_page_packet_header *vmxferpage_packet
1397                 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1398         const struct nvsp_message *nvsp = hv_pkt_data(desc);
1399         u32 msglen = hv_pkt_datalen(desc);
1400         u16 q_idx = channel->offermsg.offer.sub_channel_index;
1401         char *recv_buf = net_device->recv_buf;
1402         u32 status = NVSP_STAT_SUCCESS;
1403         int i;
1404         int count = 0;
1405
1406         /* Ensure packet is big enough to read header fields */
1407         if (msglen < sizeof(struct nvsp_message_header)) {
1408                 netif_err(net_device_ctx, rx_err, ndev,
1409                           "invalid nvsp header, length too small: %u\n",
1410                           msglen);
1411                 return 0;
1412         }
1413
1414         /* Make sure this is a valid nvsp packet */
1415         if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1416                 netif_err(net_device_ctx, rx_err, ndev,
1417                           "Unknown nvsp packet type received %u\n",
1418                           nvsp->hdr.msg_type);
1419                 return 0;
1420         }
1421
1422         /* Validate xfer page pkt header */
1423         if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
1424                 netif_err(net_device_ctx, rx_err, ndev,
1425                           "Invalid xfer page pkt, offset too small: %u\n",
1426                           desc->offset8 << 3);
1427                 return 0;
1428         }
1429
1430         if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1431                 netif_err(net_device_ctx, rx_err, ndev,
1432                           "Invalid xfer page set id - expecting %x got %x\n",
1433                           NETVSC_RECEIVE_BUFFER_ID,
1434                           vmxferpage_packet->xfer_pageset_id);
1435                 return 0;
1436         }
1437
1438         count = vmxferpage_packet->range_cnt;
1439
1440         /* Check count for a valid value */
1441         if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
1442                 netif_err(net_device_ctx, rx_err, ndev,
1443                           "Range count is not valid: %d\n",
1444                           count);
1445                 return 0;
1446         }
1447
1448         /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1449         for (i = 0; i < count; i++) {
1450                 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1451                 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1452                 void *data;
1453                 int ret;
1454
1455                 if (unlikely(offset > net_device->recv_buf_size ||
1456                              buflen > net_device->recv_buf_size - offset)) {
1457                         nvchan->rsc.cnt = 0;
1458                         status = NVSP_STAT_FAIL;
1459                         netif_err(net_device_ctx, rx_err, ndev,
1460                                   "Packet offset:%u + len:%u too big\n",
1461                                   offset, buflen);
1462
1463                         continue;
1464                 }
1465
1466                 /* We're going to copy (sections of) the packet into nvchan->recv_buf;
1467                  * make sure that nvchan->recv_buf is large enough to hold the packet.
1468                  */
1469                 if (unlikely(buflen > net_device->recv_section_size)) {
1470                         nvchan->rsc.cnt = 0;
1471                         status = NVSP_STAT_FAIL;
1472                         netif_err(net_device_ctx, rx_err, ndev,
1473                                   "Packet too big: buflen=%u recv_section_size=%u\n",
1474                                   buflen, net_device->recv_section_size);
1475
1476                         continue;
1477                 }
1478
1479                 data = recv_buf + offset;
1480
1481                 nvchan->rsc.is_last = (i == count - 1);
1482
1483                 trace_rndis_recv(ndev, q_idx, data);
1484
1485                 /* Pass it to the upper layer */
1486                 ret = rndis_filter_receive(ndev, net_device,
1487                                            nvchan, data, buflen);
1488
1489                 if (unlikely(ret != NVSP_STAT_SUCCESS)) {
1490                         /* Drop incomplete packet */
1491                         nvchan->rsc.cnt = 0;
1492                         status = NVSP_STAT_FAIL;
1493                 }
1494         }
1495
1496         enq_receive_complete(ndev, net_device, q_idx,
1497                              vmxferpage_packet->d.trans_id, status);
1498
1499         return count;
1500 }
1501
1502 static void netvsc_send_table(struct net_device *ndev,
1503                               struct netvsc_device *nvscdev,
1504                               const struct nvsp_message *nvmsg,
1505                               u32 msglen)
1506 {
1507         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1508         u32 count, offset, *tab;
1509         int i;
1510
1511         /* Ensure packet is big enough to read send_table fields */
1512         if (msglen < sizeof(struct nvsp_message_header) +
1513                      sizeof(struct nvsp_5_send_indirect_table)) {
1514                 netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
1515                 return;
1516         }
1517
1518         count = nvmsg->msg.v5_msg.send_table.count;
1519         offset = nvmsg->msg.v5_msg.send_table.offset;
1520
1521         if (count != VRSS_SEND_TAB_SIZE) {
1522                 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1523                 return;
1524         }
1525
1526         /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1527          * wrong due to a host bug. So fix the offset here.
1528          */
1529         if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1530             msglen >= sizeof(struct nvsp_message_header) +
1531             sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1532                 offset = sizeof(struct nvsp_message_header) +
1533                          sizeof(union nvsp_6_message_uber);
1534
1535         /* Boundary check for all versions */
1536         if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) {
1537                 netdev_err(ndev, "Received send-table offset too big:%u\n",
1538                            offset);
1539                 return;
1540         }
1541
1542         tab = (void *)nvmsg + offset;
1543
1544         for (i = 0; i < count; i++)
1545                 net_device_ctx->tx_table[i] = tab[i];
1546 }
1547
1548 static void netvsc_send_vf(struct net_device *ndev,
1549                            const struct nvsp_message *nvmsg,
1550                            u32 msglen)
1551 {
1552         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1553
1554         /* Ensure packet is big enough to read its fields */
1555         if (msglen < sizeof(struct nvsp_message_header) +
1556                      sizeof(struct nvsp_4_send_vf_association)) {
1557                 netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
1558                 return;
1559         }
1560
1561         net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1562         net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1563
1564         if (net_device_ctx->vf_alloc)
1565                 complete(&net_device_ctx->vf_add);
1566
1567         netdev_info(ndev, "VF slot %u %s\n",
1568                     net_device_ctx->vf_serial,
1569                     net_device_ctx->vf_alloc ? "added" : "removed");
1570 }
1571
1572 static void netvsc_receive_inband(struct net_device *ndev,
1573                                   struct netvsc_device *nvscdev,
1574                                   const struct vmpacket_descriptor *desc)
1575 {
1576         const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1577         u32 msglen = hv_pkt_datalen(desc);
1578
1579         /* Ensure packet is big enough to read header fields */
1580         if (msglen < sizeof(struct nvsp_message_header)) {
1581                 netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
1582                 return;
1583         }
1584
1585         switch (nvmsg->hdr.msg_type) {
1586         case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1587                 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1588                 break;
1589
1590         case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1591                 if (hv_is_isolation_supported())
1592                         netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n");
1593                 else
1594                         netvsc_send_vf(ndev, nvmsg, msglen);
1595                 break;
1596         }
1597 }
1598
1599 static int netvsc_process_raw_pkt(struct hv_device *device,
1600                                   struct netvsc_channel *nvchan,
1601                                   struct netvsc_device *net_device,
1602                                   struct net_device *ndev,
1603                                   const struct vmpacket_descriptor *desc,
1604                                   int budget)
1605 {
1606         struct vmbus_channel *channel = nvchan->channel;
1607         const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1608
1609         trace_nvsp_recv(ndev, channel, nvmsg);
1610
1611         switch (desc->type) {
1612         case VM_PKT_COMP:
1613                 netvsc_send_completion(ndev, net_device, channel, desc, budget);
1614                 break;
1615
1616         case VM_PKT_DATA_USING_XFER_PAGES:
1617                 return netvsc_receive(ndev, net_device, nvchan, desc);
1618
1619         case VM_PKT_DATA_INBAND:
1620                 netvsc_receive_inband(ndev, net_device, desc);
1621                 break;
1622
1623         default:
1624                 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1625                            desc->type, desc->trans_id);
1626                 break;
1627         }
1628
1629         return 0;
1630 }
1631
1632 static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1633 {
1634         struct vmbus_channel *primary = channel->primary_channel;
1635
1636         return primary ? primary->device_obj : channel->device_obj;
1637 }
1638
1639 /* Network processing softirq
1640  * Process data in incoming ring buffer from host
1641  * Stops when ring is empty or budget is met or exceeded.
1642  */
1643 int netvsc_poll(struct napi_struct *napi, int budget)
1644 {
1645         struct netvsc_channel *nvchan
1646                 = container_of(napi, struct netvsc_channel, napi);
1647         struct netvsc_device *net_device = nvchan->net_device;
1648         struct vmbus_channel *channel = nvchan->channel;
1649         struct hv_device *device = netvsc_channel_to_device(channel);
1650         struct net_device *ndev = hv_get_drvdata(device);
1651         int work_done = 0;
1652         int ret;
1653
1654         /* If starting a new interval */
1655         if (!nvchan->desc)
1656                 nvchan->desc = hv_pkt_iter_first(channel);
1657
1658         nvchan->xdp_flush = false;
1659
1660         while (nvchan->desc && work_done < budget) {
1661                 work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1662                                                     ndev, nvchan->desc, budget);
1663                 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1664         }
1665
1666         if (nvchan->xdp_flush)
1667                 xdp_do_flush();
1668
1669         /* Send any pending receive completions */
1670         ret = send_recv_completions(ndev, net_device, nvchan);
1671
1672         /* If it did not exhaust NAPI budget this time
1673          *  and not doing busy poll
1674          * then re-enable host interrupts
1675          *  and reschedule if ring is not empty
1676          *   or sending receive completion failed.
1677          */
1678         if (work_done < budget &&
1679             napi_complete_done(napi, work_done) &&
1680             (ret || hv_end_read(&channel->inbound)) &&
1681             napi_schedule_prep(napi)) {
1682                 hv_begin_read(&channel->inbound);
1683                 __napi_schedule(napi);
1684         }
1685
1686         /* Driver may overshoot since multiple packets per descriptor */
1687         return min(work_done, budget);
1688 }
1689
1690 /* Call back when data is available in host ring buffer.
1691  * Processing is deferred until network softirq (NAPI)
1692  */
1693 void netvsc_channel_cb(void *context)
1694 {
1695         struct netvsc_channel *nvchan = context;
1696         struct vmbus_channel *channel = nvchan->channel;
1697         struct hv_ring_buffer_info *rbi = &channel->inbound;
1698
1699         /* preload first vmpacket descriptor */
1700         prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1701
1702         if (napi_schedule_prep(&nvchan->napi)) {
1703                 /* disable interrupts from host */
1704                 hv_begin_read(rbi);
1705
1706                 __napi_schedule_irqoff(&nvchan->napi);
1707         }
1708 }
1709
1710 /*
1711  * netvsc_device_add - Callback when the device belonging to this
1712  * driver is added
1713  */
1714 struct netvsc_device *netvsc_device_add(struct hv_device *device,
1715                                 const struct netvsc_device_info *device_info)
1716 {
1717         int i, ret = 0;
1718         struct netvsc_device *net_device;
1719         struct net_device *ndev = hv_get_drvdata(device);
1720         struct net_device_context *net_device_ctx = netdev_priv(ndev);
1721
1722         net_device = alloc_net_device();
1723         if (!net_device)
1724                 return ERR_PTR(-ENOMEM);
1725
1726         for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1727                 net_device_ctx->tx_table[i] = 0;
1728
1729         /* Because the device uses NAPI, all the interrupt batching and
1730          * control is done via Net softirq, not the channel handling
1731          */
1732         set_channel_read_mode(device->channel, HV_CALL_ISR);
1733
1734         /* If we're reopening the device we may have multiple queues, fill the
1735          * chn_table with the default channel to use it before subchannels are
1736          * opened.
1737          * Initialize the channel state before we open;
1738          * we can be interrupted as soon as we open the channel.
1739          */
1740
1741         for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1742                 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1743
1744                 nvchan->channel = device->channel;
1745                 nvchan->net_device = net_device;
1746                 u64_stats_init(&nvchan->tx_stats.syncp);
1747                 u64_stats_init(&nvchan->rx_stats.syncp);
1748
1749                 ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0);
1750
1751                 if (ret) {
1752                         netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
1753                         goto cleanup2;
1754                 }
1755
1756                 ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
1757                                                  MEM_TYPE_PAGE_SHARED, NULL);
1758
1759                 if (ret) {
1760                         netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
1761                         goto cleanup2;
1762                 }
1763         }
1764
1765         /* Enable NAPI handler before init callbacks */
1766         netif_napi_add(ndev, &net_device->chan_table[0].napi, netvsc_poll);
1767
1768         /* Open the channel */
1769         device->channel->next_request_id_callback = vmbus_next_request_id;
1770         device->channel->request_addr_callback = vmbus_request_addr;
1771         device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1772         device->channel->max_pkt_size = NETVSC_MAX_PKT_SIZE;
1773
1774         ret = vmbus_open(device->channel, netvsc_ring_bytes,
1775                          netvsc_ring_bytes,  NULL, 0,
1776                          netvsc_channel_cb, net_device->chan_table);
1777
1778         if (ret != 0) {
1779                 netdev_err(ndev, "unable to open channel: %d\n", ret);
1780                 goto cleanup;
1781         }
1782
1783         /* Channel is opened */
1784         netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1785
1786         napi_enable(&net_device->chan_table[0].napi);
1787
1788         /* Connect with the NetVsp */
1789         ret = netvsc_connect_vsp(device, net_device, device_info);
1790         if (ret != 0) {
1791                 netdev_err(ndev,
1792                         "unable to connect to NetVSP - %d\n", ret);
1793                 goto close;
1794         }
1795
1796         /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1797          * populated.
1798          */
1799         rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1800
1801         return net_device;
1802
1803 close:
1804         RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1805         napi_disable(&net_device->chan_table[0].napi);
1806
1807         /* Now, we can close the channel safely */
1808         vmbus_close(device->channel);
1809
1810 cleanup:
1811         netif_napi_del(&net_device->chan_table[0].napi);
1812
1813 cleanup2:
1814         free_netvsc_device(&net_device->rcu);
1815
1816         return ERR_PTR(ret);
1817 }