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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2009, Microsoft Corporation.
0004  *
0005  * Authors:
0006  *   Haiyang Zhang <haiyangz@microsoft.com>
0007  *   Hank Janssen  <hjanssen@microsoft.com>
0008  */
0009 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0010 
0011 #include <linux/kernel.h>
0012 #include <linux/sched.h>
0013 #include <linux/wait.h>
0014 #include <linux/mm.h>
0015 #include <linux/delay.h>
0016 #include <linux/io.h>
0017 #include <linux/slab.h>
0018 #include <linux/netdevice.h>
0019 #include <linux/if_ether.h>
0020 #include <linux/vmalloc.h>
0021 #include <linux/rtnetlink.h>
0022 #include <linux/prefetch.h>
0023 #include <linux/filter.h>
0024 
0025 #include <asm/sync_bitops.h>
0026 #include <asm/mshyperv.h>
0027 
0028 #include "hyperv_net.h"
0029 #include "netvsc_trace.h"
0030 
0031 /*
0032  * Switch the data path from the synthetic interface to the VF
0033  * interface.
0034  */
0035 int netvsc_switch_datapath(struct net_device *ndev, bool vf)
0036 {
0037     struct net_device_context *net_device_ctx = netdev_priv(ndev);
0038     struct hv_device *dev = net_device_ctx->device_ctx;
0039     struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
0040     struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
0041     int ret, retry = 0;
0042 
0043     /* Block sending traffic to VF if it's about to be gone */
0044     if (!vf)
0045         net_device_ctx->data_path_is_vf = vf;
0046 
0047     memset(init_pkt, 0, sizeof(struct nvsp_message));
0048     init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
0049     if (vf)
0050         init_pkt->msg.v4_msg.active_dp.active_datapath =
0051             NVSP_DATAPATH_VF;
0052     else
0053         init_pkt->msg.v4_msg.active_dp.active_datapath =
0054             NVSP_DATAPATH_SYNTHETIC;
0055 
0056 again:
0057     trace_nvsp_send(ndev, init_pkt);
0058 
0059     ret = vmbus_sendpacket(dev->channel, init_pkt,
0060                    sizeof(struct nvsp_message),
0061                    (unsigned long)init_pkt, VM_PKT_DATA_INBAND,
0062                    VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
0063 
0064     /* If failed to switch to/from VF, let data_path_is_vf stay false,
0065      * so we use synthetic path to send data.
0066      */
0067     if (ret) {
0068         if (ret != -EAGAIN) {
0069             netdev_err(ndev,
0070                    "Unable to send sw datapath msg, err: %d\n",
0071                    ret);
0072             return ret;
0073         }
0074 
0075         if (retry++ < RETRY_MAX) {
0076             usleep_range(RETRY_US_LO, RETRY_US_HI);
0077             goto again;
0078         } else {
0079             netdev_err(
0080                 ndev,
0081                 "Retry failed to send sw datapath msg, err: %d\n",
0082                 ret);
0083             return ret;
0084         }
0085     }
0086 
0087     wait_for_completion(&nv_dev->channel_init_wait);
0088     net_device_ctx->data_path_is_vf = vf;
0089 
0090     return 0;
0091 }
0092 
0093 /* Worker to setup sub channels on initial setup
0094  * Initial hotplug event occurs in softirq context
0095  * and can't wait for channels.
0096  */
0097 static void netvsc_subchan_work(struct work_struct *w)
0098 {
0099     struct netvsc_device *nvdev =
0100         container_of(w, struct netvsc_device, subchan_work);
0101     struct rndis_device *rdev;
0102     int i, ret;
0103 
0104     /* Avoid deadlock with device removal already under RTNL */
0105     if (!rtnl_trylock()) {
0106         schedule_work(w);
0107         return;
0108     }
0109 
0110     rdev = nvdev->extension;
0111     if (rdev) {
0112         ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
0113         if (ret == 0) {
0114             netif_device_attach(rdev->ndev);
0115         } else {
0116             /* fallback to only primary channel */
0117             for (i = 1; i < nvdev->num_chn; i++)
0118                 netif_napi_del(&nvdev->chan_table[i].napi);
0119 
0120             nvdev->max_chn = 1;
0121             nvdev->num_chn = 1;
0122         }
0123     }
0124 
0125     rtnl_unlock();
0126 }
0127 
0128 static struct netvsc_device *alloc_net_device(void)
0129 {
0130     struct netvsc_device *net_device;
0131 
0132     net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
0133     if (!net_device)
0134         return NULL;
0135 
0136     init_waitqueue_head(&net_device->wait_drain);
0137     net_device->destroy = false;
0138     net_device->tx_disable = true;
0139 
0140     net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
0141     net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
0142 
0143     init_completion(&net_device->channel_init_wait);
0144     init_waitqueue_head(&net_device->subchan_open);
0145     INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
0146 
0147     return net_device;
0148 }
0149 
0150 static void free_netvsc_device(struct rcu_head *head)
0151 {
0152     struct netvsc_device *nvdev
0153         = container_of(head, struct netvsc_device, rcu);
0154     int i;
0155 
0156     kfree(nvdev->extension);
0157 
0158     if (nvdev->recv_original_buf)
0159         vfree(nvdev->recv_original_buf);
0160     else
0161         vfree(nvdev->recv_buf);
0162 
0163     if (nvdev->send_original_buf)
0164         vfree(nvdev->send_original_buf);
0165     else
0166         vfree(nvdev->send_buf);
0167 
0168     bitmap_free(nvdev->send_section_map);
0169 
0170     for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
0171         xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
0172         kfree(nvdev->chan_table[i].recv_buf);
0173         vfree(nvdev->chan_table[i].mrc.slots);
0174     }
0175 
0176     kfree(nvdev);
0177 }
0178 
0179 static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
0180 {
0181     call_rcu(&nvdev->rcu, free_netvsc_device);
0182 }
0183 
0184 static void netvsc_revoke_recv_buf(struct hv_device *device,
0185                    struct netvsc_device *net_device,
0186                    struct net_device *ndev)
0187 {
0188     struct nvsp_message *revoke_packet;
0189     int ret;
0190 
0191     /*
0192      * If we got a section count, it means we received a
0193      * SendReceiveBufferComplete msg (ie sent
0194      * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
0195      * to send a revoke msg here
0196      */
0197     if (net_device->recv_section_cnt) {
0198         /* Send the revoke receive buffer */
0199         revoke_packet = &net_device->revoke_packet;
0200         memset(revoke_packet, 0, sizeof(struct nvsp_message));
0201 
0202         revoke_packet->hdr.msg_type =
0203             NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
0204         revoke_packet->msg.v1_msg.
0205         revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
0206 
0207         trace_nvsp_send(ndev, revoke_packet);
0208 
0209         ret = vmbus_sendpacket(device->channel,
0210                        revoke_packet,
0211                        sizeof(struct nvsp_message),
0212                        VMBUS_RQST_ID_NO_RESPONSE,
0213                        VM_PKT_DATA_INBAND, 0);
0214         /* If the failure is because the channel is rescinded;
0215          * ignore the failure since we cannot send on a rescinded
0216          * channel. This would allow us to properly cleanup
0217          * even when the channel is rescinded.
0218          */
0219         if (device->channel->rescind)
0220             ret = 0;
0221         /*
0222          * If we failed here, we might as well return and
0223          * have a leak rather than continue and a bugchk
0224          */
0225         if (ret != 0) {
0226             netdev_err(ndev, "unable to send "
0227                 "revoke receive buffer to netvsp\n");
0228             return;
0229         }
0230         net_device->recv_section_cnt = 0;
0231     }
0232 }
0233 
0234 static void netvsc_revoke_send_buf(struct hv_device *device,
0235                    struct netvsc_device *net_device,
0236                    struct net_device *ndev)
0237 {
0238     struct nvsp_message *revoke_packet;
0239     int ret;
0240 
0241     /* Deal with the send buffer we may have setup.
0242      * If we got a  send section size, it means we received a
0243      * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
0244      * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
0245      * to send a revoke msg here
0246      */
0247     if (net_device->send_section_cnt) {
0248         /* Send the revoke receive buffer */
0249         revoke_packet = &net_device->revoke_packet;
0250         memset(revoke_packet, 0, sizeof(struct nvsp_message));
0251 
0252         revoke_packet->hdr.msg_type =
0253             NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
0254         revoke_packet->msg.v1_msg.revoke_send_buf.id =
0255             NETVSC_SEND_BUFFER_ID;
0256 
0257         trace_nvsp_send(ndev, revoke_packet);
0258 
0259         ret = vmbus_sendpacket(device->channel,
0260                        revoke_packet,
0261                        sizeof(struct nvsp_message),
0262                        VMBUS_RQST_ID_NO_RESPONSE,
0263                        VM_PKT_DATA_INBAND, 0);
0264 
0265         /* If the failure is because the channel is rescinded;
0266          * ignore the failure since we cannot send on a rescinded
0267          * channel. This would allow us to properly cleanup
0268          * even when the channel is rescinded.
0269          */
0270         if (device->channel->rescind)
0271             ret = 0;
0272 
0273         /* If we failed here, we might as well return and
0274          * have a leak rather than continue and a bugchk
0275          */
0276         if (ret != 0) {
0277             netdev_err(ndev, "unable to send "
0278                    "revoke send buffer to netvsp\n");
0279             return;
0280         }
0281         net_device->send_section_cnt = 0;
0282     }
0283 }
0284 
0285 static void netvsc_teardown_recv_gpadl(struct hv_device *device,
0286                        struct netvsc_device *net_device,
0287                        struct net_device *ndev)
0288 {
0289     int ret;
0290 
0291     if (net_device->recv_buf_gpadl_handle.gpadl_handle) {
0292         ret = vmbus_teardown_gpadl(device->channel,
0293                        &net_device->recv_buf_gpadl_handle);
0294 
0295         /* If we failed here, we might as well return and have a leak
0296          * rather than continue and a bugchk
0297          */
0298         if (ret != 0) {
0299             netdev_err(ndev,
0300                    "unable to teardown receive buffer's gpadl\n");
0301             return;
0302         }
0303     }
0304 }
0305 
0306 static void netvsc_teardown_send_gpadl(struct hv_device *device,
0307                        struct netvsc_device *net_device,
0308                        struct net_device *ndev)
0309 {
0310     int ret;
0311 
0312     if (net_device->send_buf_gpadl_handle.gpadl_handle) {
0313         ret = vmbus_teardown_gpadl(device->channel,
0314                        &net_device->send_buf_gpadl_handle);
0315 
0316         /* If we failed here, we might as well return and have a leak
0317          * rather than continue and a bugchk
0318          */
0319         if (ret != 0) {
0320             netdev_err(ndev,
0321                    "unable to teardown send buffer's gpadl\n");
0322             return;
0323         }
0324     }
0325 }
0326 
0327 int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
0328 {
0329     struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
0330     int node = cpu_to_node(nvchan->channel->target_cpu);
0331     size_t size;
0332 
0333     size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
0334     nvchan->mrc.slots = vzalloc_node(size, node);
0335     if (!nvchan->mrc.slots)
0336         nvchan->mrc.slots = vzalloc(size);
0337 
0338     return nvchan->mrc.slots ? 0 : -ENOMEM;
0339 }
0340 
0341 static int netvsc_init_buf(struct hv_device *device,
0342                struct netvsc_device *net_device,
0343                const struct netvsc_device_info *device_info)
0344 {
0345     struct nvsp_1_message_send_receive_buffer_complete *resp;
0346     struct net_device *ndev = hv_get_drvdata(device);
0347     struct nvsp_message *init_packet;
0348     unsigned int buf_size;
0349     int i, ret = 0;
0350     void *vaddr;
0351 
0352     /* Get receive buffer area. */
0353     buf_size = device_info->recv_sections * device_info->recv_section_size;
0354     buf_size = roundup(buf_size, PAGE_SIZE);
0355 
0356     /* Legacy hosts only allow smaller receive buffer */
0357     if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
0358         buf_size = min_t(unsigned int, buf_size,
0359                  NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
0360 
0361     net_device->recv_buf = vzalloc(buf_size);
0362     if (!net_device->recv_buf) {
0363         netdev_err(ndev,
0364                "unable to allocate receive buffer of size %u\n",
0365                buf_size);
0366         ret = -ENOMEM;
0367         goto cleanup;
0368     }
0369 
0370     net_device->recv_buf_size = buf_size;
0371 
0372     /*
0373      * Establish the gpadl handle for this buffer on this
0374      * channel.  Note: This call uses the vmbus connection rather
0375      * than the channel to establish the gpadl handle.
0376      */
0377     ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
0378                     buf_size,
0379                     &net_device->recv_buf_gpadl_handle);
0380     if (ret != 0) {
0381         netdev_err(ndev,
0382             "unable to establish receive buffer's gpadl\n");
0383         goto cleanup;
0384     }
0385 
0386     if (hv_isolation_type_snp()) {
0387         vaddr = hv_map_memory(net_device->recv_buf, buf_size);
0388         if (!vaddr) {
0389             ret = -ENOMEM;
0390             goto cleanup;
0391         }
0392 
0393         net_device->recv_original_buf = net_device->recv_buf;
0394         net_device->recv_buf = vaddr;
0395     }
0396 
0397     /* Notify the NetVsp of the gpadl handle */
0398     init_packet = &net_device->channel_init_pkt;
0399     memset(init_packet, 0, sizeof(struct nvsp_message));
0400     init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
0401     init_packet->msg.v1_msg.send_recv_buf.
0402         gpadl_handle = net_device->recv_buf_gpadl_handle.gpadl_handle;
0403     init_packet->msg.v1_msg.
0404         send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
0405 
0406     trace_nvsp_send(ndev, init_packet);
0407 
0408     /* Send the gpadl notification request */
0409     ret = vmbus_sendpacket(device->channel, init_packet,
0410                    sizeof(struct nvsp_message),
0411                    (unsigned long)init_packet,
0412                    VM_PKT_DATA_INBAND,
0413                    VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
0414     if (ret != 0) {
0415         netdev_err(ndev,
0416             "unable to send receive buffer's gpadl to netvsp\n");
0417         goto cleanup;
0418     }
0419 
0420     wait_for_completion(&net_device->channel_init_wait);
0421 
0422     /* Check the response */
0423     resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
0424     if (resp->status != NVSP_STAT_SUCCESS) {
0425         netdev_err(ndev,
0426                "Unable to complete receive buffer initialization with NetVsp - status %d\n",
0427                resp->status);
0428         ret = -EINVAL;
0429         goto cleanup;
0430     }
0431 
0432     /* Parse the response */
0433     netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
0434            resp->num_sections, resp->sections[0].sub_alloc_size,
0435            resp->sections[0].num_sub_allocs);
0436 
0437     /* There should only be one section for the entire receive buffer */
0438     if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
0439         ret = -EINVAL;
0440         goto cleanup;
0441     }
0442 
0443     net_device->recv_section_size = resp->sections[0].sub_alloc_size;
0444     net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
0445 
0446     /* Ensure buffer will not overflow */
0447     if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size *
0448         (u64)net_device->recv_section_cnt > (u64)buf_size) {
0449         netdev_err(ndev, "invalid recv_section_size %u\n",
0450                net_device->recv_section_size);
0451         ret = -EINVAL;
0452         goto cleanup;
0453     }
0454 
0455     for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
0456         struct netvsc_channel *nvchan = &net_device->chan_table[i];
0457 
0458         nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL);
0459         if (nvchan->recv_buf == NULL) {
0460             ret = -ENOMEM;
0461             goto cleanup;
0462         }
0463     }
0464 
0465     /* Setup receive completion ring.
0466      * Add 1 to the recv_section_cnt because at least one entry in a
0467      * ring buffer has to be empty.
0468      */
0469     net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
0470     ret = netvsc_alloc_recv_comp_ring(net_device, 0);
0471     if (ret)
0472         goto cleanup;
0473 
0474     /* Now setup the send buffer. */
0475     buf_size = device_info->send_sections * device_info->send_section_size;
0476     buf_size = round_up(buf_size, PAGE_SIZE);
0477 
0478     net_device->send_buf = vzalloc(buf_size);
0479     if (!net_device->send_buf) {
0480         netdev_err(ndev, "unable to allocate send buffer of size %u\n",
0481                buf_size);
0482         ret = -ENOMEM;
0483         goto cleanup;
0484     }
0485     net_device->send_buf_size = buf_size;
0486 
0487     /* Establish the gpadl handle for this buffer on this
0488      * channel.  Note: This call uses the vmbus connection rather
0489      * than the channel to establish the gpadl handle.
0490      */
0491     ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
0492                     buf_size,
0493                     &net_device->send_buf_gpadl_handle);
0494     if (ret != 0) {
0495         netdev_err(ndev,
0496                "unable to establish send buffer's gpadl\n");
0497         goto cleanup;
0498     }
0499 
0500     if (hv_isolation_type_snp()) {
0501         vaddr = hv_map_memory(net_device->send_buf, buf_size);
0502         if (!vaddr) {
0503             ret = -ENOMEM;
0504             goto cleanup;
0505         }
0506 
0507         net_device->send_original_buf = net_device->send_buf;
0508         net_device->send_buf = vaddr;
0509     }
0510 
0511     /* Notify the NetVsp of the gpadl handle */
0512     init_packet = &net_device->channel_init_pkt;
0513     memset(init_packet, 0, sizeof(struct nvsp_message));
0514     init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
0515     init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
0516         net_device->send_buf_gpadl_handle.gpadl_handle;
0517     init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
0518 
0519     trace_nvsp_send(ndev, init_packet);
0520 
0521     /* Send the gpadl notification request */
0522     ret = vmbus_sendpacket(device->channel, init_packet,
0523                    sizeof(struct nvsp_message),
0524                    (unsigned long)init_packet,
0525                    VM_PKT_DATA_INBAND,
0526                    VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
0527     if (ret != 0) {
0528         netdev_err(ndev,
0529                "unable to send send buffer's gpadl to netvsp\n");
0530         goto cleanup;
0531     }
0532 
0533     wait_for_completion(&net_device->channel_init_wait);
0534 
0535     /* Check the response */
0536     if (init_packet->msg.v1_msg.
0537         send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
0538         netdev_err(ndev, "Unable to complete send buffer "
0539                "initialization with NetVsp - status %d\n",
0540                init_packet->msg.v1_msg.
0541                send_send_buf_complete.status);
0542         ret = -EINVAL;
0543         goto cleanup;
0544     }
0545 
0546     /* Parse the response */
0547     net_device->send_section_size = init_packet->msg.
0548                 v1_msg.send_send_buf_complete.section_size;
0549     if (net_device->send_section_size < NETVSC_MTU_MIN) {
0550         netdev_err(ndev, "invalid send_section_size %u\n",
0551                net_device->send_section_size);
0552         ret = -EINVAL;
0553         goto cleanup;
0554     }
0555 
0556     /* Section count is simply the size divided by the section size. */
0557     net_device->send_section_cnt = buf_size / net_device->send_section_size;
0558 
0559     netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
0560            net_device->send_section_size, net_device->send_section_cnt);
0561 
0562     /* Setup state for managing the send buffer. */
0563     net_device->send_section_map = bitmap_zalloc(net_device->send_section_cnt,
0564                              GFP_KERNEL);
0565     if (!net_device->send_section_map) {
0566         ret = -ENOMEM;
0567         goto cleanup;
0568     }
0569 
0570     goto exit;
0571 
0572 cleanup:
0573     netvsc_revoke_recv_buf(device, net_device, ndev);
0574     netvsc_revoke_send_buf(device, net_device, ndev);
0575     netvsc_teardown_recv_gpadl(device, net_device, ndev);
0576     netvsc_teardown_send_gpadl(device, net_device, ndev);
0577 
0578 exit:
0579     return ret;
0580 }
0581 
0582 /* Negotiate NVSP protocol version */
0583 static int negotiate_nvsp_ver(struct hv_device *device,
0584                   struct netvsc_device *net_device,
0585                   struct nvsp_message *init_packet,
0586                   u32 nvsp_ver)
0587 {
0588     struct net_device *ndev = hv_get_drvdata(device);
0589     int ret;
0590 
0591     memset(init_packet, 0, sizeof(struct nvsp_message));
0592     init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
0593     init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
0594     init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
0595     trace_nvsp_send(ndev, init_packet);
0596 
0597     /* Send the init request */
0598     ret = vmbus_sendpacket(device->channel, init_packet,
0599                    sizeof(struct nvsp_message),
0600                    (unsigned long)init_packet,
0601                    VM_PKT_DATA_INBAND,
0602                    VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
0603 
0604     if (ret != 0)
0605         return ret;
0606 
0607     wait_for_completion(&net_device->channel_init_wait);
0608 
0609     if (init_packet->msg.init_msg.init_complete.status !=
0610         NVSP_STAT_SUCCESS)
0611         return -EINVAL;
0612 
0613     if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
0614         return 0;
0615 
0616     /* NVSPv2 or later: Send NDIS config */
0617     memset(init_packet, 0, sizeof(struct nvsp_message));
0618     init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
0619     init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
0620     init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
0621 
0622     if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
0623         if (hv_is_isolation_supported())
0624             netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n");
0625         else
0626             init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
0627 
0628         /* Teaming bit is needed to receive link speed updates */
0629         init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
0630     }
0631 
0632     if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
0633         init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
0634 
0635     trace_nvsp_send(ndev, init_packet);
0636 
0637     ret = vmbus_sendpacket(device->channel, init_packet,
0638                 sizeof(struct nvsp_message),
0639                 VMBUS_RQST_ID_NO_RESPONSE,
0640                 VM_PKT_DATA_INBAND, 0);
0641 
0642     return ret;
0643 }
0644 
0645 static int netvsc_connect_vsp(struct hv_device *device,
0646                   struct netvsc_device *net_device,
0647                   const struct netvsc_device_info *device_info)
0648 {
0649     struct net_device *ndev = hv_get_drvdata(device);
0650     static const u32 ver_list[] = {
0651         NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
0652         NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
0653         NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
0654     };
0655     struct nvsp_message *init_packet;
0656     int ndis_version, i, ret;
0657 
0658     init_packet = &net_device->channel_init_pkt;
0659 
0660     /* Negotiate the latest NVSP protocol supported */
0661     for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
0662         if (negotiate_nvsp_ver(device, net_device, init_packet,
0663                        ver_list[i])  == 0) {
0664             net_device->nvsp_version = ver_list[i];
0665             break;
0666         }
0667 
0668     if (i < 0) {
0669         ret = -EPROTO;
0670         goto cleanup;
0671     }
0672 
0673     if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) {
0674         netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n",
0675                net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61);
0676         ret = -EPROTO;
0677         goto cleanup;
0678     }
0679 
0680     pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
0681 
0682     /* Send the ndis version */
0683     memset(init_packet, 0, sizeof(struct nvsp_message));
0684 
0685     if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
0686         ndis_version = 0x00060001;
0687     else
0688         ndis_version = 0x0006001e;
0689 
0690     init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
0691     init_packet->msg.v1_msg.
0692         send_ndis_ver.ndis_major_ver =
0693                 (ndis_version & 0xFFFF0000) >> 16;
0694     init_packet->msg.v1_msg.
0695         send_ndis_ver.ndis_minor_ver =
0696                 ndis_version & 0xFFFF;
0697 
0698     trace_nvsp_send(ndev, init_packet);
0699 
0700     /* Send the init request */
0701     ret = vmbus_sendpacket(device->channel, init_packet,
0702                 sizeof(struct nvsp_message),
0703                 VMBUS_RQST_ID_NO_RESPONSE,
0704                 VM_PKT_DATA_INBAND, 0);
0705     if (ret != 0)
0706         goto cleanup;
0707 
0708 
0709     ret = netvsc_init_buf(device, net_device, device_info);
0710 
0711 cleanup:
0712     return ret;
0713 }
0714 
0715 /*
0716  * netvsc_device_remove - Callback when the root bus device is removed
0717  */
0718 void netvsc_device_remove(struct hv_device *device)
0719 {
0720     struct net_device *ndev = hv_get_drvdata(device);
0721     struct net_device_context *net_device_ctx = netdev_priv(ndev);
0722     struct netvsc_device *net_device
0723         = rtnl_dereference(net_device_ctx->nvdev);
0724     int i;
0725 
0726     /*
0727      * Revoke receive buffer. If host is pre-Win2016 then tear down
0728      * receive buffer GPADL. Do the same for send buffer.
0729      */
0730     netvsc_revoke_recv_buf(device, net_device, ndev);
0731     if (vmbus_proto_version < VERSION_WIN10)
0732         netvsc_teardown_recv_gpadl(device, net_device, ndev);
0733 
0734     netvsc_revoke_send_buf(device, net_device, ndev);
0735     if (vmbus_proto_version < VERSION_WIN10)
0736         netvsc_teardown_send_gpadl(device, net_device, ndev);
0737 
0738     RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
0739 
0740     /* Disable NAPI and disassociate its context from the device. */
0741     for (i = 0; i < net_device->num_chn; i++) {
0742         /* See also vmbus_reset_channel_cb(). */
0743         napi_disable(&net_device->chan_table[i].napi);
0744         netif_napi_del(&net_device->chan_table[i].napi);
0745     }
0746 
0747     /*
0748      * At this point, no one should be accessing net_device
0749      * except in here
0750      */
0751     netdev_dbg(ndev, "net device safe to remove\n");
0752 
0753     /* Now, we can close the channel safely */
0754     vmbus_close(device->channel);
0755 
0756     /*
0757      * If host is Win2016 or higher then we do the GPADL tear down
0758      * here after VMBus is closed.
0759     */
0760     if (vmbus_proto_version >= VERSION_WIN10) {
0761         netvsc_teardown_recv_gpadl(device, net_device, ndev);
0762         netvsc_teardown_send_gpadl(device, net_device, ndev);
0763     }
0764 
0765     if (net_device->recv_original_buf)
0766         hv_unmap_memory(net_device->recv_buf);
0767 
0768     if (net_device->send_original_buf)
0769         hv_unmap_memory(net_device->send_buf);
0770 
0771     /* Release all resources */
0772     free_netvsc_device_rcu(net_device);
0773 }
0774 
0775 #define RING_AVAIL_PERCENT_HIWATER 20
0776 #define RING_AVAIL_PERCENT_LOWATER 10
0777 
0778 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
0779                      u32 index)
0780 {
0781     sync_change_bit(index, net_device->send_section_map);
0782 }
0783 
0784 static void netvsc_send_tx_complete(struct net_device *ndev,
0785                     struct netvsc_device *net_device,
0786                     struct vmbus_channel *channel,
0787                     const struct vmpacket_descriptor *desc,
0788                     int budget)
0789 {
0790     struct net_device_context *ndev_ctx = netdev_priv(ndev);
0791     struct sk_buff *skb;
0792     u16 q_idx = 0;
0793     int queue_sends;
0794     u64 cmd_rqst;
0795 
0796     cmd_rqst = channel->request_addr_callback(channel, desc->trans_id);
0797     if (cmd_rqst == VMBUS_RQST_ERROR) {
0798         netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
0799         return;
0800     }
0801 
0802     skb = (struct sk_buff *)(unsigned long)cmd_rqst;
0803 
0804     /* Notify the layer above us */
0805     if (likely(skb)) {
0806         struct hv_netvsc_packet *packet
0807             = (struct hv_netvsc_packet *)skb->cb;
0808         u32 send_index = packet->send_buf_index;
0809         struct netvsc_stats_tx *tx_stats;
0810 
0811         if (send_index != NETVSC_INVALID_INDEX)
0812             netvsc_free_send_slot(net_device, send_index);
0813         q_idx = packet->q_idx;
0814 
0815         tx_stats = &net_device->chan_table[q_idx].tx_stats;
0816 
0817         u64_stats_update_begin(&tx_stats->syncp);
0818         tx_stats->packets += packet->total_packets;
0819         tx_stats->bytes += packet->total_bytes;
0820         u64_stats_update_end(&tx_stats->syncp);
0821 
0822         netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
0823         napi_consume_skb(skb, budget);
0824     }
0825 
0826     queue_sends =
0827         atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
0828 
0829     if (unlikely(net_device->destroy)) {
0830         if (queue_sends == 0)
0831             wake_up(&net_device->wait_drain);
0832     } else {
0833         struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
0834 
0835         if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
0836             (hv_get_avail_to_write_percent(&channel->outbound) >
0837              RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
0838             netif_tx_wake_queue(txq);
0839             ndev_ctx->eth_stats.wake_queue++;
0840         }
0841     }
0842 }
0843 
0844 static void netvsc_send_completion(struct net_device *ndev,
0845                    struct netvsc_device *net_device,
0846                    struct vmbus_channel *incoming_channel,
0847                    const struct vmpacket_descriptor *desc,
0848                    int budget)
0849 {
0850     const struct nvsp_message *nvsp_packet;
0851     u32 msglen = hv_pkt_datalen(desc);
0852     struct nvsp_message *pkt_rqst;
0853     u64 cmd_rqst;
0854 
0855     /* First check if this is a VMBUS completion without data payload */
0856     if (!msglen) {
0857         cmd_rqst = incoming_channel->request_addr_callback(incoming_channel,
0858                                    desc->trans_id);
0859         if (cmd_rqst == VMBUS_RQST_ERROR) {
0860             netdev_err(ndev, "Invalid transaction ID %llx\n", desc->trans_id);
0861             return;
0862         }
0863 
0864         pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst;
0865         switch (pkt_rqst->hdr.msg_type) {
0866         case NVSP_MSG4_TYPE_SWITCH_DATA_PATH:
0867             complete(&net_device->channel_init_wait);
0868             break;
0869 
0870         default:
0871             netdev_err(ndev, "Unexpected VMBUS completion!!\n");
0872         }
0873         return;
0874     }
0875 
0876     /* Ensure packet is big enough to read header fields */
0877     if (msglen < sizeof(struct nvsp_message_header)) {
0878         netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
0879         return;
0880     }
0881 
0882     nvsp_packet = hv_pkt_data(desc);
0883     switch (nvsp_packet->hdr.msg_type) {
0884     case NVSP_MSG_TYPE_INIT_COMPLETE:
0885         if (msglen < sizeof(struct nvsp_message_header) +
0886                 sizeof(struct nvsp_message_init_complete)) {
0887             netdev_err(ndev, "nvsp_msg length too small: %u\n",
0888                    msglen);
0889             return;
0890         }
0891         fallthrough;
0892 
0893     case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
0894         if (msglen < sizeof(struct nvsp_message_header) +
0895                 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
0896             netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
0897                    msglen);
0898             return;
0899         }
0900         fallthrough;
0901 
0902     case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
0903         if (msglen < sizeof(struct nvsp_message_header) +
0904                 sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
0905             netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
0906                    msglen);
0907             return;
0908         }
0909         fallthrough;
0910 
0911     case NVSP_MSG5_TYPE_SUBCHANNEL:
0912         if (msglen < sizeof(struct nvsp_message_header) +
0913                 sizeof(struct nvsp_5_subchannel_complete)) {
0914             netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
0915                    msglen);
0916             return;
0917         }
0918         /* Copy the response back */
0919         memcpy(&net_device->channel_init_pkt, nvsp_packet,
0920                sizeof(struct nvsp_message));
0921         complete(&net_device->channel_init_wait);
0922         break;
0923 
0924     case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
0925         netvsc_send_tx_complete(ndev, net_device, incoming_channel,
0926                     desc, budget);
0927         break;
0928 
0929     default:
0930         netdev_err(ndev,
0931                "Unknown send completion type %d received!!\n",
0932                nvsp_packet->hdr.msg_type);
0933     }
0934 }
0935 
0936 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
0937 {
0938     unsigned long *map_addr = net_device->send_section_map;
0939     unsigned int i;
0940 
0941     for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
0942         if (sync_test_and_set_bit(i, map_addr) == 0)
0943             return i;
0944     }
0945 
0946     return NETVSC_INVALID_INDEX;
0947 }
0948 
0949 static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
0950                     unsigned int section_index,
0951                     u32 pend_size,
0952                     struct hv_netvsc_packet *packet,
0953                     struct rndis_message *rndis_msg,
0954                     struct hv_page_buffer *pb,
0955                     bool xmit_more)
0956 {
0957     char *start = net_device->send_buf;
0958     char *dest = start + (section_index * net_device->send_section_size)
0959              + pend_size;
0960     int i;
0961     u32 padding = 0;
0962     u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
0963         packet->page_buf_cnt;
0964     u32 remain;
0965 
0966     /* Add padding */
0967     remain = packet->total_data_buflen & (net_device->pkt_align - 1);
0968     if (xmit_more && remain) {
0969         padding = net_device->pkt_align - remain;
0970         rndis_msg->msg_len += padding;
0971         packet->total_data_buflen += padding;
0972     }
0973 
0974     for (i = 0; i < page_count; i++) {
0975         char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
0976         u32 offset = pb[i].offset;
0977         u32 len = pb[i].len;
0978 
0979         memcpy(dest, (src + offset), len);
0980         dest += len;
0981     }
0982 
0983     if (padding)
0984         memset(dest, 0, padding);
0985 }
0986 
0987 void netvsc_dma_unmap(struct hv_device *hv_dev,
0988               struct hv_netvsc_packet *packet)
0989 {
0990     u32 page_count = packet->cp_partial ?
0991         packet->page_buf_cnt - packet->rmsg_pgcnt :
0992         packet->page_buf_cnt;
0993     int i;
0994 
0995     if (!hv_is_isolation_supported())
0996         return;
0997 
0998     if (!packet->dma_range)
0999         return;
1000 
1001     for (i = 0; i < page_count; i++)
1002         dma_unmap_single(&hv_dev->device, packet->dma_range[i].dma,
1003                  packet->dma_range[i].mapping_size,
1004                  DMA_TO_DEVICE);
1005 
1006     kfree(packet->dma_range);
1007 }
1008 
1009 /* netvsc_dma_map - Map swiotlb bounce buffer with data page of
1010  * packet sent by vmbus_sendpacket_pagebuffer() in the Isolation
1011  * VM.
1012  *
1013  * In isolation VM, netvsc send buffer has been marked visible to
1014  * host and so the data copied to send buffer doesn't need to use
1015  * bounce buffer. The data pages handled by vmbus_sendpacket_pagebuffer()
1016  * may not be copied to send buffer and so these pages need to be
1017  * mapped with swiotlb bounce buffer. netvsc_dma_map() is to do
1018  * that. The pfns in the struct hv_page_buffer need to be converted
1019  * to bounce buffer's pfn. The loop here is necessary because the
1020  * entries in the page buffer array are not necessarily full
1021  * pages of data.  Each entry in the array has a separate offset and
1022  * len that may be non-zero, even for entries in the middle of the
1023  * array.  And the entries are not physically contiguous.  So each
1024  * entry must be individually mapped rather than as a contiguous unit.
1025  * So not use dma_map_sg() here.
1026  */
1027 static int netvsc_dma_map(struct hv_device *hv_dev,
1028               struct hv_netvsc_packet *packet,
1029               struct hv_page_buffer *pb)
1030 {
1031     u32 page_count =  packet->cp_partial ?
1032         packet->page_buf_cnt - packet->rmsg_pgcnt :
1033         packet->page_buf_cnt;
1034     dma_addr_t dma;
1035     int i;
1036 
1037     if (!hv_is_isolation_supported())
1038         return 0;
1039 
1040     packet->dma_range = kcalloc(page_count,
1041                     sizeof(*packet->dma_range),
1042                     GFP_KERNEL);
1043     if (!packet->dma_range)
1044         return -ENOMEM;
1045 
1046     for (i = 0; i < page_count; i++) {
1047         char *src = phys_to_virt((pb[i].pfn << HV_HYP_PAGE_SHIFT)
1048                      + pb[i].offset);
1049         u32 len = pb[i].len;
1050 
1051         dma = dma_map_single(&hv_dev->device, src, len,
1052                      DMA_TO_DEVICE);
1053         if (dma_mapping_error(&hv_dev->device, dma)) {
1054             kfree(packet->dma_range);
1055             return -ENOMEM;
1056         }
1057 
1058         /* pb[].offset and pb[].len are not changed during dma mapping
1059          * and so not reassign.
1060          */
1061         packet->dma_range[i].dma = dma;
1062         packet->dma_range[i].mapping_size = len;
1063         pb[i].pfn = dma >> HV_HYP_PAGE_SHIFT;
1064     }
1065 
1066     return 0;
1067 }
1068 
1069 static inline int netvsc_send_pkt(
1070     struct hv_device *device,
1071     struct hv_netvsc_packet *packet,
1072     struct netvsc_device *net_device,
1073     struct hv_page_buffer *pb,
1074     struct sk_buff *skb)
1075 {
1076     struct nvsp_message nvmsg;
1077     struct nvsp_1_message_send_rndis_packet *rpkt =
1078         &nvmsg.msg.v1_msg.send_rndis_pkt;
1079     struct netvsc_channel * const nvchan =
1080         &net_device->chan_table[packet->q_idx];
1081     struct vmbus_channel *out_channel = nvchan->channel;
1082     struct net_device *ndev = hv_get_drvdata(device);
1083     struct net_device_context *ndev_ctx = netdev_priv(ndev);
1084     struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
1085     u64 req_id;
1086     int ret;
1087     u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
1088 
1089     memset(&nvmsg, 0, sizeof(struct nvsp_message));
1090     nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
1091     if (skb)
1092         rpkt->channel_type = 0;     /* 0 is RMC_DATA */
1093     else
1094         rpkt->channel_type = 1;     /* 1 is RMC_CONTROL */
1095 
1096     rpkt->send_buf_section_index = packet->send_buf_index;
1097     if (packet->send_buf_index == NETVSC_INVALID_INDEX)
1098         rpkt->send_buf_section_size = 0;
1099     else
1100         rpkt->send_buf_section_size = packet->total_data_buflen;
1101 
1102     req_id = (ulong)skb;
1103 
1104     if (out_channel->rescind)
1105         return -ENODEV;
1106 
1107     trace_nvsp_send_pkt(ndev, out_channel, rpkt);
1108 
1109     packet->dma_range = NULL;
1110     if (packet->page_buf_cnt) {
1111         if (packet->cp_partial)
1112             pb += packet->rmsg_pgcnt;
1113 
1114         ret = netvsc_dma_map(ndev_ctx->device_ctx, packet, pb);
1115         if (ret) {
1116             ret = -EAGAIN;
1117             goto exit;
1118         }
1119 
1120         ret = vmbus_sendpacket_pagebuffer(out_channel,
1121                           pb, packet->page_buf_cnt,
1122                           &nvmsg, sizeof(nvmsg),
1123                           req_id);
1124 
1125         if (ret)
1126             netvsc_dma_unmap(ndev_ctx->device_ctx, packet);
1127     } else {
1128         ret = vmbus_sendpacket(out_channel,
1129                        &nvmsg, sizeof(nvmsg),
1130                        req_id, VM_PKT_DATA_INBAND,
1131                        VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1132     }
1133 
1134 exit:
1135     if (ret == 0) {
1136         atomic_inc_return(&nvchan->queue_sends);
1137 
1138         if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
1139             netif_tx_stop_queue(txq);
1140             ndev_ctx->eth_stats.stop_queue++;
1141         }
1142     } else if (ret == -EAGAIN) {
1143         netif_tx_stop_queue(txq);
1144         ndev_ctx->eth_stats.stop_queue++;
1145     } else {
1146         netdev_err(ndev,
1147                "Unable to send packet pages %u len %u, ret %d\n",
1148                packet->page_buf_cnt, packet->total_data_buflen,
1149                ret);
1150     }
1151 
1152     if (netif_tx_queue_stopped(txq) &&
1153         atomic_read(&nvchan->queue_sends) < 1 &&
1154         !net_device->tx_disable) {
1155         netif_tx_wake_queue(txq);
1156         ndev_ctx->eth_stats.wake_queue++;
1157         if (ret == -EAGAIN)
1158             ret = -ENOSPC;
1159     }
1160 
1161     return ret;
1162 }
1163 
1164 /* Move packet out of multi send data (msd), and clear msd */
1165 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
1166                 struct sk_buff **msd_skb,
1167                 struct multi_send_data *msdp)
1168 {
1169     *msd_skb = msdp->skb;
1170     *msd_send = msdp->pkt;
1171     msdp->skb = NULL;
1172     msdp->pkt = NULL;
1173     msdp->count = 0;
1174 }
1175 
1176 /* RCU already held by caller */
1177 /* Batching/bouncing logic is designed to attempt to optimize
1178  * performance.
1179  *
1180  * For small, non-LSO packets we copy the packet to a send buffer
1181  * which is pre-registered with the Hyper-V side. This enables the
1182  * hypervisor to avoid remapping the aperture to access the packet
1183  * descriptor and data.
1184  *
1185  * If we already started using a buffer and the netdev is transmitting
1186  * a burst of packets, keep on copying into the buffer until it is
1187  * full or we are done collecting a burst. If there is an existing
1188  * buffer with space for the RNDIS descriptor but not the packet, copy
1189  * the RNDIS descriptor to the buffer, keeping the packet in place.
1190  *
1191  * If we do batching and send more than one packet using a single
1192  * NetVSC message, free the SKBs of the packets copied, except for the
1193  * last packet. This is done to streamline the handling of the case
1194  * where the last packet only had the RNDIS descriptor copied to the
1195  * send buffer, with the data pointers included in the NetVSC message.
1196  */
1197 int netvsc_send(struct net_device *ndev,
1198         struct hv_netvsc_packet *packet,
1199         struct rndis_message *rndis_msg,
1200         struct hv_page_buffer *pb,
1201         struct sk_buff *skb,
1202         bool xdp_tx)
1203 {
1204     struct net_device_context *ndev_ctx = netdev_priv(ndev);
1205     struct netvsc_device *net_device
1206         = rcu_dereference_bh(ndev_ctx->nvdev);
1207     struct hv_device *device = ndev_ctx->device_ctx;
1208     int ret = 0;
1209     struct netvsc_channel *nvchan;
1210     u32 pktlen = packet->total_data_buflen, msd_len = 0;
1211     unsigned int section_index = NETVSC_INVALID_INDEX;
1212     struct multi_send_data *msdp;
1213     struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
1214     struct sk_buff *msd_skb = NULL;
1215     bool try_batch, xmit_more;
1216 
1217     /* If device is rescinded, return error and packet will get dropped. */
1218     if (unlikely(!net_device || net_device->destroy))
1219         return -ENODEV;
1220 
1221     nvchan = &net_device->chan_table[packet->q_idx];
1222     packet->send_buf_index = NETVSC_INVALID_INDEX;
1223     packet->cp_partial = false;
1224 
1225     /* Send a control message or XDP packet directly without accessing
1226      * msd (Multi-Send Data) field which may be changed during data packet
1227      * processing.
1228      */
1229     if (!skb || xdp_tx)
1230         return netvsc_send_pkt(device, packet, net_device, pb, skb);
1231 
1232     /* batch packets in send buffer if possible */
1233     msdp = &nvchan->msd;
1234     if (msdp->pkt)
1235         msd_len = msdp->pkt->total_data_buflen;
1236 
1237     try_batch =  msd_len > 0 && msdp->count < net_device->max_pkt;
1238     if (try_batch && msd_len + pktlen + net_device->pkt_align <
1239         net_device->send_section_size) {
1240         section_index = msdp->pkt->send_buf_index;
1241 
1242     } else if (try_batch && msd_len + packet->rmsg_size <
1243            net_device->send_section_size) {
1244         section_index = msdp->pkt->send_buf_index;
1245         packet->cp_partial = true;
1246 
1247     } else if (pktlen + net_device->pkt_align <
1248            net_device->send_section_size) {
1249         section_index = netvsc_get_next_send_section(net_device);
1250         if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
1251             ++ndev_ctx->eth_stats.tx_send_full;
1252         } else {
1253             move_pkt_msd(&msd_send, &msd_skb, msdp);
1254             msd_len = 0;
1255         }
1256     }
1257 
1258     /* Keep aggregating only if stack says more data is coming
1259      * and not doing mixed modes send and not flow blocked
1260      */
1261     xmit_more = netdev_xmit_more() &&
1262         !packet->cp_partial &&
1263         !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
1264 
1265     if (section_index != NETVSC_INVALID_INDEX) {
1266         netvsc_copy_to_send_buf(net_device,
1267                     section_index, msd_len,
1268                     packet, rndis_msg, pb, xmit_more);
1269 
1270         packet->send_buf_index = section_index;
1271 
1272         if (packet->cp_partial) {
1273             packet->page_buf_cnt -= packet->rmsg_pgcnt;
1274             packet->total_data_buflen = msd_len + packet->rmsg_size;
1275         } else {
1276             packet->page_buf_cnt = 0;
1277             packet->total_data_buflen += msd_len;
1278         }
1279 
1280         if (msdp->pkt) {
1281             packet->total_packets += msdp->pkt->total_packets;
1282             packet->total_bytes += msdp->pkt->total_bytes;
1283         }
1284 
1285         if (msdp->skb)
1286             dev_consume_skb_any(msdp->skb);
1287 
1288         if (xmit_more) {
1289             msdp->skb = skb;
1290             msdp->pkt = packet;
1291             msdp->count++;
1292         } else {
1293             cur_send = packet;
1294             msdp->skb = NULL;
1295             msdp->pkt = NULL;
1296             msdp->count = 0;
1297         }
1298     } else {
1299         move_pkt_msd(&msd_send, &msd_skb, msdp);
1300         cur_send = packet;
1301     }
1302 
1303     if (msd_send) {
1304         int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1305                         NULL, msd_skb);
1306 
1307         if (m_ret != 0) {
1308             netvsc_free_send_slot(net_device,
1309                           msd_send->send_buf_index);
1310             dev_kfree_skb_any(msd_skb);
1311         }
1312     }
1313 
1314     if (cur_send)
1315         ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1316 
1317     if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1318         netvsc_free_send_slot(net_device, section_index);
1319 
1320     return ret;
1321 }
1322 
1323 /* Send pending recv completions */
1324 static int send_recv_completions(struct net_device *ndev,
1325                  struct netvsc_device *nvdev,
1326                  struct netvsc_channel *nvchan)
1327 {
1328     struct multi_recv_comp *mrc = &nvchan->mrc;
1329     struct recv_comp_msg {
1330         struct nvsp_message_header hdr;
1331         u32 status;
1332     }  __packed;
1333     struct recv_comp_msg msg = {
1334         .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1335     };
1336     int ret;
1337 
1338     while (mrc->first != mrc->next) {
1339         const struct recv_comp_data *rcd
1340             = mrc->slots + mrc->first;
1341 
1342         msg.status = rcd->status;
1343         ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1344                        rcd->tid, VM_PKT_COMP, 0);
1345         if (unlikely(ret)) {
1346             struct net_device_context *ndev_ctx = netdev_priv(ndev);
1347 
1348             ++ndev_ctx->eth_stats.rx_comp_busy;
1349             return ret;
1350         }
1351 
1352         if (++mrc->first == nvdev->recv_completion_cnt)
1353             mrc->first = 0;
1354     }
1355 
1356     /* receive completion ring has been emptied */
1357     if (unlikely(nvdev->destroy))
1358         wake_up(&nvdev->wait_drain);
1359 
1360     return 0;
1361 }
1362 
1363 /* Count how many receive completions are outstanding */
1364 static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1365                  const struct multi_recv_comp *mrc,
1366                  u32 *filled, u32 *avail)
1367 {
1368     u32 count = nvdev->recv_completion_cnt;
1369 
1370     if (mrc->next >= mrc->first)
1371         *filled = mrc->next - mrc->first;
1372     else
1373         *filled = (count - mrc->first) + mrc->next;
1374 
1375     *avail = count - *filled - 1;
1376 }
1377 
1378 /* Add receive complete to ring to send to host. */
1379 static void enq_receive_complete(struct net_device *ndev,
1380                  struct netvsc_device *nvdev, u16 q_idx,
1381                  u64 tid, u32 status)
1382 {
1383     struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1384     struct multi_recv_comp *mrc = &nvchan->mrc;
1385     struct recv_comp_data *rcd;
1386     u32 filled, avail;
1387 
1388     recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1389 
1390     if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1391         send_recv_completions(ndev, nvdev, nvchan);
1392         recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1393     }
1394 
1395     if (unlikely(!avail)) {
1396         netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1397                q_idx, tid);
1398         return;
1399     }
1400 
1401     rcd = mrc->slots + mrc->next;
1402     rcd->tid = tid;
1403     rcd->status = status;
1404 
1405     if (++mrc->next == nvdev->recv_completion_cnt)
1406         mrc->next = 0;
1407 }
1408 
1409 static int netvsc_receive(struct net_device *ndev,
1410               struct netvsc_device *net_device,
1411               struct netvsc_channel *nvchan,
1412               const struct vmpacket_descriptor *desc)
1413 {
1414     struct net_device_context *net_device_ctx = netdev_priv(ndev);
1415     struct vmbus_channel *channel = nvchan->channel;
1416     const struct vmtransfer_page_packet_header *vmxferpage_packet
1417         = container_of(desc, const struct vmtransfer_page_packet_header, d);
1418     const struct nvsp_message *nvsp = hv_pkt_data(desc);
1419     u32 msglen = hv_pkt_datalen(desc);
1420     u16 q_idx = channel->offermsg.offer.sub_channel_index;
1421     char *recv_buf = net_device->recv_buf;
1422     u32 status = NVSP_STAT_SUCCESS;
1423     int i;
1424     int count = 0;
1425 
1426     /* Ensure packet is big enough to read header fields */
1427     if (msglen < sizeof(struct nvsp_message_header)) {
1428         netif_err(net_device_ctx, rx_err, ndev,
1429               "invalid nvsp header, length too small: %u\n",
1430               msglen);
1431         return 0;
1432     }
1433 
1434     /* Make sure this is a valid nvsp packet */
1435     if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1436         netif_err(net_device_ctx, rx_err, ndev,
1437               "Unknown nvsp packet type received %u\n",
1438               nvsp->hdr.msg_type);
1439         return 0;
1440     }
1441 
1442     /* Validate xfer page pkt header */
1443     if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
1444         netif_err(net_device_ctx, rx_err, ndev,
1445               "Invalid xfer page pkt, offset too small: %u\n",
1446               desc->offset8 << 3);
1447         return 0;
1448     }
1449 
1450     if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1451         netif_err(net_device_ctx, rx_err, ndev,
1452               "Invalid xfer page set id - expecting %x got %x\n",
1453               NETVSC_RECEIVE_BUFFER_ID,
1454               vmxferpage_packet->xfer_pageset_id);
1455         return 0;
1456     }
1457 
1458     count = vmxferpage_packet->range_cnt;
1459 
1460     /* Check count for a valid value */
1461     if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
1462         netif_err(net_device_ctx, rx_err, ndev,
1463               "Range count is not valid: %d\n",
1464               count);
1465         return 0;
1466     }
1467 
1468     /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1469     for (i = 0; i < count; i++) {
1470         u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1471         u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1472         void *data;
1473         int ret;
1474 
1475         if (unlikely(offset > net_device->recv_buf_size ||
1476                  buflen > net_device->recv_buf_size - offset)) {
1477             nvchan->rsc.cnt = 0;
1478             status = NVSP_STAT_FAIL;
1479             netif_err(net_device_ctx, rx_err, ndev,
1480                   "Packet offset:%u + len:%u too big\n",
1481                   offset, buflen);
1482 
1483             continue;
1484         }
1485 
1486         /* We're going to copy (sections of) the packet into nvchan->recv_buf;
1487          * make sure that nvchan->recv_buf is large enough to hold the packet.
1488          */
1489         if (unlikely(buflen > net_device->recv_section_size)) {
1490             nvchan->rsc.cnt = 0;
1491             status = NVSP_STAT_FAIL;
1492             netif_err(net_device_ctx, rx_err, ndev,
1493                   "Packet too big: buflen=%u recv_section_size=%u\n",
1494                   buflen, net_device->recv_section_size);
1495 
1496             continue;
1497         }
1498 
1499         data = recv_buf + offset;
1500 
1501         nvchan->rsc.is_last = (i == count - 1);
1502 
1503         trace_rndis_recv(ndev, q_idx, data);
1504 
1505         /* Pass it to the upper layer */
1506         ret = rndis_filter_receive(ndev, net_device,
1507                        nvchan, data, buflen);
1508 
1509         if (unlikely(ret != NVSP_STAT_SUCCESS)) {
1510             /* Drop incomplete packet */
1511             nvchan->rsc.cnt = 0;
1512             status = NVSP_STAT_FAIL;
1513         }
1514     }
1515 
1516     enq_receive_complete(ndev, net_device, q_idx,
1517                  vmxferpage_packet->d.trans_id, status);
1518 
1519     return count;
1520 }
1521 
1522 static void netvsc_send_table(struct net_device *ndev,
1523                   struct netvsc_device *nvscdev,
1524                   const struct nvsp_message *nvmsg,
1525                   u32 msglen)
1526 {
1527     struct net_device_context *net_device_ctx = netdev_priv(ndev);
1528     u32 count, offset, *tab;
1529     int i;
1530 
1531     /* Ensure packet is big enough to read send_table fields */
1532     if (msglen < sizeof(struct nvsp_message_header) +
1533              sizeof(struct nvsp_5_send_indirect_table)) {
1534         netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
1535         return;
1536     }
1537 
1538     count = nvmsg->msg.v5_msg.send_table.count;
1539     offset = nvmsg->msg.v5_msg.send_table.offset;
1540 
1541     if (count != VRSS_SEND_TAB_SIZE) {
1542         netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1543         return;
1544     }
1545 
1546     /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1547      * wrong due to a host bug. So fix the offset here.
1548      */
1549     if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1550         msglen >= sizeof(struct nvsp_message_header) +
1551         sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1552         offset = sizeof(struct nvsp_message_header) +
1553              sizeof(union nvsp_6_message_uber);
1554 
1555     /* Boundary check for all versions */
1556     if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) {
1557         netdev_err(ndev, "Received send-table offset too big:%u\n",
1558                offset);
1559         return;
1560     }
1561 
1562     tab = (void *)nvmsg + offset;
1563 
1564     for (i = 0; i < count; i++)
1565         net_device_ctx->tx_table[i] = tab[i];
1566 }
1567 
1568 static void netvsc_send_vf(struct net_device *ndev,
1569                const struct nvsp_message *nvmsg,
1570                u32 msglen)
1571 {
1572     struct net_device_context *net_device_ctx = netdev_priv(ndev);
1573 
1574     /* Ensure packet is big enough to read its fields */
1575     if (msglen < sizeof(struct nvsp_message_header) +
1576              sizeof(struct nvsp_4_send_vf_association)) {
1577         netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
1578         return;
1579     }
1580 
1581     net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1582     net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1583     netdev_info(ndev, "VF slot %u %s\n",
1584             net_device_ctx->vf_serial,
1585             net_device_ctx->vf_alloc ? "added" : "removed");
1586 }
1587 
1588 static void netvsc_receive_inband(struct net_device *ndev,
1589                   struct netvsc_device *nvscdev,
1590                   const struct vmpacket_descriptor *desc)
1591 {
1592     const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1593     u32 msglen = hv_pkt_datalen(desc);
1594 
1595     /* Ensure packet is big enough to read header fields */
1596     if (msglen < sizeof(struct nvsp_message_header)) {
1597         netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
1598         return;
1599     }
1600 
1601     switch (nvmsg->hdr.msg_type) {
1602     case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1603         netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1604         break;
1605 
1606     case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1607         if (hv_is_isolation_supported())
1608             netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n");
1609         else
1610             netvsc_send_vf(ndev, nvmsg, msglen);
1611         break;
1612     }
1613 }
1614 
1615 static int netvsc_process_raw_pkt(struct hv_device *device,
1616                   struct netvsc_channel *nvchan,
1617                   struct netvsc_device *net_device,
1618                   struct net_device *ndev,
1619                   const struct vmpacket_descriptor *desc,
1620                   int budget)
1621 {
1622     struct vmbus_channel *channel = nvchan->channel;
1623     const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1624 
1625     trace_nvsp_recv(ndev, channel, nvmsg);
1626 
1627     switch (desc->type) {
1628     case VM_PKT_COMP:
1629         netvsc_send_completion(ndev, net_device, channel, desc, budget);
1630         break;
1631 
1632     case VM_PKT_DATA_USING_XFER_PAGES:
1633         return netvsc_receive(ndev, net_device, nvchan, desc);
1634 
1635     case VM_PKT_DATA_INBAND:
1636         netvsc_receive_inband(ndev, net_device, desc);
1637         break;
1638 
1639     default:
1640         netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1641                desc->type, desc->trans_id);
1642         break;
1643     }
1644 
1645     return 0;
1646 }
1647 
1648 static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1649 {
1650     struct vmbus_channel *primary = channel->primary_channel;
1651 
1652     return primary ? primary->device_obj : channel->device_obj;
1653 }
1654 
1655 /* Network processing softirq
1656  * Process data in incoming ring buffer from host
1657  * Stops when ring is empty or budget is met or exceeded.
1658  */
1659 int netvsc_poll(struct napi_struct *napi, int budget)
1660 {
1661     struct netvsc_channel *nvchan
1662         = container_of(napi, struct netvsc_channel, napi);
1663     struct netvsc_device *net_device = nvchan->net_device;
1664     struct vmbus_channel *channel = nvchan->channel;
1665     struct hv_device *device = netvsc_channel_to_device(channel);
1666     struct net_device *ndev = hv_get_drvdata(device);
1667     int work_done = 0;
1668     int ret;
1669 
1670     /* If starting a new interval */
1671     if (!nvchan->desc)
1672         nvchan->desc = hv_pkt_iter_first(channel);
1673 
1674     nvchan->xdp_flush = false;
1675 
1676     while (nvchan->desc && work_done < budget) {
1677         work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1678                             ndev, nvchan->desc, budget);
1679         nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1680     }
1681 
1682     if (nvchan->xdp_flush)
1683         xdp_do_flush();
1684 
1685     /* Send any pending receive completions */
1686     ret = send_recv_completions(ndev, net_device, nvchan);
1687 
1688     /* If it did not exhaust NAPI budget this time
1689      *  and not doing busy poll
1690      * then re-enable host interrupts
1691      *  and reschedule if ring is not empty
1692      *   or sending receive completion failed.
1693      */
1694     if (work_done < budget &&
1695         napi_complete_done(napi, work_done) &&
1696         (ret || hv_end_read(&channel->inbound)) &&
1697         napi_schedule_prep(napi)) {
1698         hv_begin_read(&channel->inbound);
1699         __napi_schedule(napi);
1700     }
1701 
1702     /* Driver may overshoot since multiple packets per descriptor */
1703     return min(work_done, budget);
1704 }
1705 
1706 /* Call back when data is available in host ring buffer.
1707  * Processing is deferred until network softirq (NAPI)
1708  */
1709 void netvsc_channel_cb(void *context)
1710 {
1711     struct netvsc_channel *nvchan = context;
1712     struct vmbus_channel *channel = nvchan->channel;
1713     struct hv_ring_buffer_info *rbi = &channel->inbound;
1714 
1715     /* preload first vmpacket descriptor */
1716     prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1717 
1718     if (napi_schedule_prep(&nvchan->napi)) {
1719         /* disable interrupts from host */
1720         hv_begin_read(rbi);
1721 
1722         __napi_schedule_irqoff(&nvchan->napi);
1723     }
1724 }
1725 
1726 /*
1727  * netvsc_device_add - Callback when the device belonging to this
1728  * driver is added
1729  */
1730 struct netvsc_device *netvsc_device_add(struct hv_device *device,
1731                 const struct netvsc_device_info *device_info)
1732 {
1733     int i, ret = 0;
1734     struct netvsc_device *net_device;
1735     struct net_device *ndev = hv_get_drvdata(device);
1736     struct net_device_context *net_device_ctx = netdev_priv(ndev);
1737 
1738     net_device = alloc_net_device();
1739     if (!net_device)
1740         return ERR_PTR(-ENOMEM);
1741 
1742     for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1743         net_device_ctx->tx_table[i] = 0;
1744 
1745     /* Because the device uses NAPI, all the interrupt batching and
1746      * control is done via Net softirq, not the channel handling
1747      */
1748     set_channel_read_mode(device->channel, HV_CALL_ISR);
1749 
1750     /* If we're reopening the device we may have multiple queues, fill the
1751      * chn_table with the default channel to use it before subchannels are
1752      * opened.
1753      * Initialize the channel state before we open;
1754      * we can be interrupted as soon as we open the channel.
1755      */
1756 
1757     for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1758         struct netvsc_channel *nvchan = &net_device->chan_table[i];
1759 
1760         nvchan->channel = device->channel;
1761         nvchan->net_device = net_device;
1762         u64_stats_init(&nvchan->tx_stats.syncp);
1763         u64_stats_init(&nvchan->rx_stats.syncp);
1764 
1765         ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0);
1766 
1767         if (ret) {
1768             netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
1769             goto cleanup2;
1770         }
1771 
1772         ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
1773                          MEM_TYPE_PAGE_SHARED, NULL);
1774 
1775         if (ret) {
1776             netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
1777             goto cleanup2;
1778         }
1779     }
1780 
1781     /* Enable NAPI handler before init callbacks */
1782     netif_napi_add(ndev, &net_device->chan_table[0].napi,
1783                netvsc_poll, NAPI_POLL_WEIGHT);
1784 
1785     /* Open the channel */
1786     device->channel->next_request_id_callback = vmbus_next_request_id;
1787     device->channel->request_addr_callback = vmbus_request_addr;
1788     device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1789     device->channel->max_pkt_size = NETVSC_MAX_PKT_SIZE;
1790 
1791     ret = vmbus_open(device->channel, netvsc_ring_bytes,
1792              netvsc_ring_bytes,  NULL, 0,
1793              netvsc_channel_cb, net_device->chan_table);
1794 
1795     if (ret != 0) {
1796         netdev_err(ndev, "unable to open channel: %d\n", ret);
1797         goto cleanup;
1798     }
1799 
1800     /* Channel is opened */
1801     netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1802 
1803     napi_enable(&net_device->chan_table[0].napi);
1804 
1805     /* Connect with the NetVsp */
1806     ret = netvsc_connect_vsp(device, net_device, device_info);
1807     if (ret != 0) {
1808         netdev_err(ndev,
1809             "unable to connect to NetVSP - %d\n", ret);
1810         goto close;
1811     }
1812 
1813     /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1814      * populated.
1815      */
1816     rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1817 
1818     return net_device;
1819 
1820 close:
1821     RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1822     napi_disable(&net_device->chan_table[0].napi);
1823 
1824     /* Now, we can close the channel safely */
1825     vmbus_close(device->channel);
1826 
1827 cleanup:
1828     netif_napi_del(&net_device->chan_table[0].napi);
1829 
1830 cleanup2:
1831     if (net_device->recv_original_buf)
1832         hv_unmap_memory(net_device->recv_buf);
1833 
1834     if (net_device->send_original_buf)
1835         hv_unmap_memory(net_device->send_buf);
1836 
1837     free_netvsc_device(&net_device->rcu);
1838 
1839     return ERR_PTR(ret);
1840 }
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