1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2009, Microsoft Corporation.
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/wait.h>
15 #include <linux/delay.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>
24 #include <asm/sync_bitops.h>
26 #include "hyperv_net.h"
27 #include "netvsc_trace.h"
30 * Switch the data path from the synthetic interface to the VF
33 void netvsc_switch_datapath(struct net_device *ndev, bool vf)
35 struct net_device_context *net_device_ctx = netdev_priv(ndev);
36 struct hv_device *dev = net_device_ctx->device_ctx;
37 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
38 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
40 memset(init_pkt, 0, sizeof(struct nvsp_message));
41 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
43 init_pkt->msg.v4_msg.active_dp.active_datapath =
46 init_pkt->msg.v4_msg.active_dp.active_datapath =
47 NVSP_DATAPATH_SYNTHETIC;
49 trace_nvsp_send(ndev, init_pkt);
51 vmbus_sendpacket(dev->channel, init_pkt,
52 sizeof(struct nvsp_message),
53 VMBUS_RQST_ID_NO_RESPONSE,
54 VM_PKT_DATA_INBAND, 0);
57 /* Worker to setup sub channels on initial setup
58 * Initial hotplug event occurs in softirq context
59 * and can't wait for channels.
61 static void netvsc_subchan_work(struct work_struct *w)
63 struct netvsc_device *nvdev =
64 container_of(w, struct netvsc_device, subchan_work);
65 struct rndis_device *rdev;
68 /* Avoid deadlock with device removal already under RTNL */
69 if (!rtnl_trylock()) {
74 rdev = nvdev->extension;
76 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
78 netif_device_attach(rdev->ndev);
80 /* fallback to only primary channel */
81 for (i = 1; i < nvdev->num_chn; i++)
82 netif_napi_del(&nvdev->chan_table[i].napi);
92 static struct netvsc_device *alloc_net_device(void)
94 struct netvsc_device *net_device;
96 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
100 init_waitqueue_head(&net_device->wait_drain);
101 net_device->destroy = false;
102 net_device->tx_disable = true;
104 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
105 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
107 init_completion(&net_device->channel_init_wait);
108 init_waitqueue_head(&net_device->subchan_open);
109 INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
114 static void free_netvsc_device(struct rcu_head *head)
116 struct netvsc_device *nvdev
117 = container_of(head, struct netvsc_device, rcu);
120 kfree(nvdev->extension);
121 vfree(nvdev->recv_buf);
122 vfree(nvdev->send_buf);
123 kfree(nvdev->send_section_map);
125 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
126 xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
127 vfree(nvdev->chan_table[i].mrc.slots);
133 static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
135 call_rcu(&nvdev->rcu, free_netvsc_device);
138 static void netvsc_revoke_recv_buf(struct hv_device *device,
139 struct netvsc_device *net_device,
140 struct net_device *ndev)
142 struct nvsp_message *revoke_packet;
146 * If we got a section count, it means we received a
147 * SendReceiveBufferComplete msg (ie sent
148 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
149 * to send a revoke msg here
151 if (net_device->recv_section_cnt) {
152 /* Send the revoke receive buffer */
153 revoke_packet = &net_device->revoke_packet;
154 memset(revoke_packet, 0, sizeof(struct nvsp_message));
156 revoke_packet->hdr.msg_type =
157 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
158 revoke_packet->msg.v1_msg.
159 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
161 trace_nvsp_send(ndev, revoke_packet);
163 ret = vmbus_sendpacket(device->channel,
165 sizeof(struct nvsp_message),
166 VMBUS_RQST_ID_NO_RESPONSE,
167 VM_PKT_DATA_INBAND, 0);
168 /* If the failure is because the channel is rescinded;
169 * ignore the failure since we cannot send on a rescinded
170 * channel. This would allow us to properly cleanup
171 * even when the channel is rescinded.
173 if (device->channel->rescind)
176 * If we failed here, we might as well return and
177 * have a leak rather than continue and a bugchk
180 netdev_err(ndev, "unable to send "
181 "revoke receive buffer to netvsp\n");
184 net_device->recv_section_cnt = 0;
188 static void netvsc_revoke_send_buf(struct hv_device *device,
189 struct netvsc_device *net_device,
190 struct net_device *ndev)
192 struct nvsp_message *revoke_packet;
195 /* Deal with the send buffer we may have setup.
196 * If we got a send section size, it means we received a
197 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
198 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
199 * to send a revoke msg here
201 if (net_device->send_section_cnt) {
202 /* Send the revoke receive buffer */
203 revoke_packet = &net_device->revoke_packet;
204 memset(revoke_packet, 0, sizeof(struct nvsp_message));
206 revoke_packet->hdr.msg_type =
207 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
208 revoke_packet->msg.v1_msg.revoke_send_buf.id =
209 NETVSC_SEND_BUFFER_ID;
211 trace_nvsp_send(ndev, revoke_packet);
213 ret = vmbus_sendpacket(device->channel,
215 sizeof(struct nvsp_message),
216 VMBUS_RQST_ID_NO_RESPONSE,
217 VM_PKT_DATA_INBAND, 0);
219 /* If the failure is because the channel is rescinded;
220 * ignore the failure since we cannot send on a rescinded
221 * channel. This would allow us to properly cleanup
222 * even when the channel is rescinded.
224 if (device->channel->rescind)
227 /* If we failed here, we might as well return and
228 * have a leak rather than continue and a bugchk
231 netdev_err(ndev, "unable to send "
232 "revoke send buffer to netvsp\n");
235 net_device->send_section_cnt = 0;
239 static void netvsc_teardown_recv_gpadl(struct hv_device *device,
240 struct netvsc_device *net_device,
241 struct net_device *ndev)
245 if (net_device->recv_buf_gpadl_handle) {
246 ret = vmbus_teardown_gpadl(device->channel,
247 net_device->recv_buf_gpadl_handle);
249 /* If we failed here, we might as well return and have a leak
250 * rather than continue and a bugchk
254 "unable to teardown receive buffer's gpadl\n");
257 net_device->recv_buf_gpadl_handle = 0;
261 static void netvsc_teardown_send_gpadl(struct hv_device *device,
262 struct netvsc_device *net_device,
263 struct net_device *ndev)
267 if (net_device->send_buf_gpadl_handle) {
268 ret = vmbus_teardown_gpadl(device->channel,
269 net_device->send_buf_gpadl_handle);
271 /* If we failed here, we might as well return and have a leak
272 * rather than continue and a bugchk
276 "unable to teardown send buffer's gpadl\n");
279 net_device->send_buf_gpadl_handle = 0;
283 int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
285 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
286 int node = cpu_to_node(nvchan->channel->target_cpu);
289 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
290 nvchan->mrc.slots = vzalloc_node(size, node);
291 if (!nvchan->mrc.slots)
292 nvchan->mrc.slots = vzalloc(size);
294 return nvchan->mrc.slots ? 0 : -ENOMEM;
297 static int netvsc_init_buf(struct hv_device *device,
298 struct netvsc_device *net_device,
299 const struct netvsc_device_info *device_info)
301 struct nvsp_1_message_send_receive_buffer_complete *resp;
302 struct net_device *ndev = hv_get_drvdata(device);
303 struct nvsp_message *init_packet;
304 unsigned int buf_size;
308 /* Get receive buffer area. */
309 buf_size = device_info->recv_sections * device_info->recv_section_size;
310 buf_size = roundup(buf_size, PAGE_SIZE);
312 /* Legacy hosts only allow smaller receive buffer */
313 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
314 buf_size = min_t(unsigned int, buf_size,
315 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
317 net_device->recv_buf = vzalloc(buf_size);
318 if (!net_device->recv_buf) {
320 "unable to allocate receive buffer of size %u\n",
326 net_device->recv_buf_size = buf_size;
329 * Establish the gpadl handle for this buffer on this
330 * channel. Note: This call uses the vmbus connection rather
331 * than the channel to establish the gpadl handle.
333 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
335 &net_device->recv_buf_gpadl_handle);
338 "unable to establish receive buffer's gpadl\n");
342 /* Notify the NetVsp of the gpadl handle */
343 init_packet = &net_device->channel_init_pkt;
344 memset(init_packet, 0, sizeof(struct nvsp_message));
345 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
346 init_packet->msg.v1_msg.send_recv_buf.
347 gpadl_handle = net_device->recv_buf_gpadl_handle;
348 init_packet->msg.v1_msg.
349 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
351 trace_nvsp_send(ndev, init_packet);
353 /* Send the gpadl notification request */
354 ret = vmbus_sendpacket(device->channel, init_packet,
355 sizeof(struct nvsp_message),
356 (unsigned long)init_packet,
358 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
361 "unable to send receive buffer's gpadl to netvsp\n");
365 wait_for_completion(&net_device->channel_init_wait);
367 /* Check the response */
368 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
369 if (resp->status != NVSP_STAT_SUCCESS) {
371 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
377 /* Parse the response */
378 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
379 resp->num_sections, resp->sections[0].sub_alloc_size,
380 resp->sections[0].num_sub_allocs);
382 /* There should only be one section for the entire receive buffer */
383 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
388 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
389 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
391 /* Ensure buffer will not overflow */
392 if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size *
393 (u64)net_device->recv_section_cnt > (u64)buf_size) {
394 netdev_err(ndev, "invalid recv_section_size %u\n",
395 net_device->recv_section_size);
400 /* Setup receive completion ring.
401 * Add 1 to the recv_section_cnt because at least one entry in a
402 * ring buffer has to be empty.
404 net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
405 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
409 /* Now setup the send buffer. */
410 buf_size = device_info->send_sections * device_info->send_section_size;
411 buf_size = round_up(buf_size, PAGE_SIZE);
413 net_device->send_buf = vzalloc(buf_size);
414 if (!net_device->send_buf) {
415 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
421 /* Establish the gpadl handle for this buffer on this
422 * channel. Note: This call uses the vmbus connection rather
423 * than the channel to establish the gpadl handle.
425 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
427 &net_device->send_buf_gpadl_handle);
430 "unable to establish send buffer's gpadl\n");
434 /* Notify the NetVsp of the gpadl handle */
435 init_packet = &net_device->channel_init_pkt;
436 memset(init_packet, 0, sizeof(struct nvsp_message));
437 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
438 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
439 net_device->send_buf_gpadl_handle;
440 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
442 trace_nvsp_send(ndev, init_packet);
444 /* Send the gpadl notification request */
445 ret = vmbus_sendpacket(device->channel, init_packet,
446 sizeof(struct nvsp_message),
447 (unsigned long)init_packet,
449 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
452 "unable to send send buffer's gpadl to netvsp\n");
456 wait_for_completion(&net_device->channel_init_wait);
458 /* Check the response */
459 if (init_packet->msg.v1_msg.
460 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
461 netdev_err(ndev, "Unable to complete send buffer "
462 "initialization with NetVsp - status %d\n",
463 init_packet->msg.v1_msg.
464 send_send_buf_complete.status);
469 /* Parse the response */
470 net_device->send_section_size = init_packet->msg.
471 v1_msg.send_send_buf_complete.section_size;
472 if (net_device->send_section_size < NETVSC_MTU_MIN) {
473 netdev_err(ndev, "invalid send_section_size %u\n",
474 net_device->send_section_size);
479 /* Section count is simply the size divided by the section size. */
480 net_device->send_section_cnt = buf_size / net_device->send_section_size;
482 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
483 net_device->send_section_size, net_device->send_section_cnt);
485 /* Setup state for managing the send buffer. */
486 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
488 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
489 if (net_device->send_section_map == NULL) {
497 netvsc_revoke_recv_buf(device, net_device, ndev);
498 netvsc_revoke_send_buf(device, net_device, ndev);
499 netvsc_teardown_recv_gpadl(device, net_device, ndev);
500 netvsc_teardown_send_gpadl(device, net_device, ndev);
506 /* Negotiate NVSP protocol version */
507 static int negotiate_nvsp_ver(struct hv_device *device,
508 struct netvsc_device *net_device,
509 struct nvsp_message *init_packet,
512 struct net_device *ndev = hv_get_drvdata(device);
515 memset(init_packet, 0, sizeof(struct nvsp_message));
516 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
517 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
518 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
519 trace_nvsp_send(ndev, init_packet);
521 /* Send the init request */
522 ret = vmbus_sendpacket(device->channel, init_packet,
523 sizeof(struct nvsp_message),
524 (unsigned long)init_packet,
526 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
531 wait_for_completion(&net_device->channel_init_wait);
533 if (init_packet->msg.init_msg.init_complete.status !=
537 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
540 /* NVSPv2 or later: Send NDIS config */
541 memset(init_packet, 0, sizeof(struct nvsp_message));
542 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
543 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
544 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
546 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
547 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
549 /* Teaming bit is needed to receive link speed updates */
550 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
553 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
554 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
556 trace_nvsp_send(ndev, init_packet);
558 ret = vmbus_sendpacket(device->channel, init_packet,
559 sizeof(struct nvsp_message),
560 VMBUS_RQST_ID_NO_RESPONSE,
561 VM_PKT_DATA_INBAND, 0);
566 static int netvsc_connect_vsp(struct hv_device *device,
567 struct netvsc_device *net_device,
568 const struct netvsc_device_info *device_info)
570 struct net_device *ndev = hv_get_drvdata(device);
571 static const u32 ver_list[] = {
572 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
573 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
574 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
576 struct nvsp_message *init_packet;
577 int ndis_version, i, ret;
579 init_packet = &net_device->channel_init_pkt;
581 /* Negotiate the latest NVSP protocol supported */
582 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
583 if (negotiate_nvsp_ver(device, net_device, init_packet,
585 net_device->nvsp_version = ver_list[i];
594 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
596 /* Send the ndis version */
597 memset(init_packet, 0, sizeof(struct nvsp_message));
599 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
600 ndis_version = 0x00060001;
602 ndis_version = 0x0006001e;
604 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
605 init_packet->msg.v1_msg.
606 send_ndis_ver.ndis_major_ver =
607 (ndis_version & 0xFFFF0000) >> 16;
608 init_packet->msg.v1_msg.
609 send_ndis_ver.ndis_minor_ver =
610 ndis_version & 0xFFFF;
612 trace_nvsp_send(ndev, init_packet);
614 /* Send the init request */
615 ret = vmbus_sendpacket(device->channel, init_packet,
616 sizeof(struct nvsp_message),
617 VMBUS_RQST_ID_NO_RESPONSE,
618 VM_PKT_DATA_INBAND, 0);
623 ret = netvsc_init_buf(device, net_device, device_info);
630 * netvsc_device_remove - Callback when the root bus device is removed
632 void netvsc_device_remove(struct hv_device *device)
634 struct net_device *ndev = hv_get_drvdata(device);
635 struct net_device_context *net_device_ctx = netdev_priv(ndev);
636 struct netvsc_device *net_device
637 = rtnl_dereference(net_device_ctx->nvdev);
641 * Revoke receive buffer. If host is pre-Win2016 then tear down
642 * receive buffer GPADL. Do the same for send buffer.
644 netvsc_revoke_recv_buf(device, net_device, ndev);
645 if (vmbus_proto_version < VERSION_WIN10)
646 netvsc_teardown_recv_gpadl(device, net_device, ndev);
648 netvsc_revoke_send_buf(device, net_device, ndev);
649 if (vmbus_proto_version < VERSION_WIN10)
650 netvsc_teardown_send_gpadl(device, net_device, ndev);
652 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
654 /* Disable NAPI and disassociate its context from the device. */
655 for (i = 0; i < net_device->num_chn; i++) {
656 /* See also vmbus_reset_channel_cb(). */
657 napi_disable(&net_device->chan_table[i].napi);
658 netif_napi_del(&net_device->chan_table[i].napi);
662 * At this point, no one should be accessing net_device
665 netdev_dbg(ndev, "net device safe to remove\n");
667 /* Now, we can close the channel safely */
668 vmbus_close(device->channel);
671 * If host is Win2016 or higher then we do the GPADL tear down
672 * here after VMBus is closed.
674 if (vmbus_proto_version >= VERSION_WIN10) {
675 netvsc_teardown_recv_gpadl(device, net_device, ndev);
676 netvsc_teardown_send_gpadl(device, net_device, ndev);
679 /* Release all resources */
680 free_netvsc_device_rcu(net_device);
683 #define RING_AVAIL_PERCENT_HIWATER 20
684 #define RING_AVAIL_PERCENT_LOWATER 10
686 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
689 sync_change_bit(index, net_device->send_section_map);
692 static void netvsc_send_tx_complete(struct net_device *ndev,
693 struct netvsc_device *net_device,
694 struct vmbus_channel *channel,
695 const struct vmpacket_descriptor *desc,
698 struct net_device_context *ndev_ctx = netdev_priv(ndev);
704 cmd_rqst = vmbus_request_addr(&channel->requestor, (u64)desc->trans_id);
705 if (cmd_rqst == VMBUS_RQST_ERROR) {
706 netdev_err(ndev, "Incorrect transaction id\n");
710 skb = (struct sk_buff *)(unsigned long)cmd_rqst;
712 /* Notify the layer above us */
714 const struct hv_netvsc_packet *packet
715 = (struct hv_netvsc_packet *)skb->cb;
716 u32 send_index = packet->send_buf_index;
717 struct netvsc_stats *tx_stats;
719 if (send_index != NETVSC_INVALID_INDEX)
720 netvsc_free_send_slot(net_device, send_index);
721 q_idx = packet->q_idx;
723 tx_stats = &net_device->chan_table[q_idx].tx_stats;
725 u64_stats_update_begin(&tx_stats->syncp);
726 tx_stats->packets += packet->total_packets;
727 tx_stats->bytes += packet->total_bytes;
728 u64_stats_update_end(&tx_stats->syncp);
730 napi_consume_skb(skb, budget);
734 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
736 if (unlikely(net_device->destroy)) {
737 if (queue_sends == 0)
738 wake_up(&net_device->wait_drain);
740 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
742 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
743 (hv_get_avail_to_write_percent(&channel->outbound) >
744 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
745 netif_tx_wake_queue(txq);
746 ndev_ctx->eth_stats.wake_queue++;
751 static void netvsc_send_completion(struct net_device *ndev,
752 struct netvsc_device *net_device,
753 struct vmbus_channel *incoming_channel,
754 const struct vmpacket_descriptor *desc,
757 const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
758 u32 msglen = hv_pkt_datalen(desc);
760 /* Ensure packet is big enough to read header fields */
761 if (msglen < sizeof(struct nvsp_message_header)) {
762 netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
766 switch (nvsp_packet->hdr.msg_type) {
767 case NVSP_MSG_TYPE_INIT_COMPLETE:
768 if (msglen < sizeof(struct nvsp_message_header) +
769 sizeof(struct nvsp_message_init_complete)) {
770 netdev_err(ndev, "nvsp_msg length too small: %u\n",
776 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
777 if (msglen < sizeof(struct nvsp_message_header) +
778 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
779 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
785 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
786 if (msglen < sizeof(struct nvsp_message_header) +
787 sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
788 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
794 case NVSP_MSG5_TYPE_SUBCHANNEL:
795 if (msglen < sizeof(struct nvsp_message_header) +
796 sizeof(struct nvsp_5_subchannel_complete)) {
797 netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
801 /* Copy the response back */
802 memcpy(&net_device->channel_init_pkt, nvsp_packet,
803 sizeof(struct nvsp_message));
804 complete(&net_device->channel_init_wait);
807 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
808 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
814 "Unknown send completion type %d received!!\n",
815 nvsp_packet->hdr.msg_type);
819 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
821 unsigned long *map_addr = net_device->send_section_map;
824 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
825 if (sync_test_and_set_bit(i, map_addr) == 0)
829 return NETVSC_INVALID_INDEX;
832 static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
833 unsigned int section_index,
835 struct hv_netvsc_packet *packet,
836 struct rndis_message *rndis_msg,
837 struct hv_page_buffer *pb,
840 char *start = net_device->send_buf;
841 char *dest = start + (section_index * net_device->send_section_size)
845 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
846 packet->page_buf_cnt;
850 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
851 if (xmit_more && remain) {
852 padding = net_device->pkt_align - remain;
853 rndis_msg->msg_len += padding;
854 packet->total_data_buflen += padding;
857 for (i = 0; i < page_count; i++) {
858 char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
859 u32 offset = pb[i].offset;
862 memcpy(dest, (src + offset), len);
867 memset(dest, 0, padding);
870 static inline int netvsc_send_pkt(
871 struct hv_device *device,
872 struct hv_netvsc_packet *packet,
873 struct netvsc_device *net_device,
874 struct hv_page_buffer *pb,
877 struct nvsp_message nvmsg;
878 struct nvsp_1_message_send_rndis_packet *rpkt =
879 &nvmsg.msg.v1_msg.send_rndis_pkt;
880 struct netvsc_channel * const nvchan =
881 &net_device->chan_table[packet->q_idx];
882 struct vmbus_channel *out_channel = nvchan->channel;
883 struct net_device *ndev = hv_get_drvdata(device);
884 struct net_device_context *ndev_ctx = netdev_priv(ndev);
885 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
888 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
890 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
892 rpkt->channel_type = 0; /* 0 is RMC_DATA */
894 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
896 rpkt->send_buf_section_index = packet->send_buf_index;
897 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
898 rpkt->send_buf_section_size = 0;
900 rpkt->send_buf_section_size = packet->total_data_buflen;
904 if (out_channel->rescind)
907 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
909 if (packet->page_buf_cnt) {
910 if (packet->cp_partial)
911 pb += packet->rmsg_pgcnt;
913 ret = vmbus_sendpacket_pagebuffer(out_channel,
914 pb, packet->page_buf_cnt,
915 &nvmsg, sizeof(nvmsg),
918 ret = vmbus_sendpacket(out_channel,
919 &nvmsg, sizeof(nvmsg),
920 req_id, VM_PKT_DATA_INBAND,
921 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
925 atomic_inc_return(&nvchan->queue_sends);
927 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
928 netif_tx_stop_queue(txq);
929 ndev_ctx->eth_stats.stop_queue++;
931 } else if (ret == -EAGAIN) {
932 netif_tx_stop_queue(txq);
933 ndev_ctx->eth_stats.stop_queue++;
936 "Unable to send packet pages %u len %u, ret %d\n",
937 packet->page_buf_cnt, packet->total_data_buflen,
941 if (netif_tx_queue_stopped(txq) &&
942 atomic_read(&nvchan->queue_sends) < 1 &&
943 !net_device->tx_disable) {
944 netif_tx_wake_queue(txq);
945 ndev_ctx->eth_stats.wake_queue++;
953 /* Move packet out of multi send data (msd), and clear msd */
954 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
955 struct sk_buff **msd_skb,
956 struct multi_send_data *msdp)
958 *msd_skb = msdp->skb;
959 *msd_send = msdp->pkt;
965 /* RCU already held by caller */
966 int netvsc_send(struct net_device *ndev,
967 struct hv_netvsc_packet *packet,
968 struct rndis_message *rndis_msg,
969 struct hv_page_buffer *pb,
973 struct net_device_context *ndev_ctx = netdev_priv(ndev);
974 struct netvsc_device *net_device
975 = rcu_dereference_bh(ndev_ctx->nvdev);
976 struct hv_device *device = ndev_ctx->device_ctx;
978 struct netvsc_channel *nvchan;
979 u32 pktlen = packet->total_data_buflen, msd_len = 0;
980 unsigned int section_index = NETVSC_INVALID_INDEX;
981 struct multi_send_data *msdp;
982 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
983 struct sk_buff *msd_skb = NULL;
984 bool try_batch, xmit_more;
986 /* If device is rescinded, return error and packet will get dropped. */
987 if (unlikely(!net_device || net_device->destroy))
990 nvchan = &net_device->chan_table[packet->q_idx];
991 packet->send_buf_index = NETVSC_INVALID_INDEX;
992 packet->cp_partial = false;
994 /* Send a control message or XDP packet directly without accessing
995 * msd (Multi-Send Data) field which may be changed during data packet
999 return netvsc_send_pkt(device, packet, net_device, pb, skb);
1001 /* batch packets in send buffer if possible */
1002 msdp = &nvchan->msd;
1004 msd_len = msdp->pkt->total_data_buflen;
1006 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
1007 if (try_batch && msd_len + pktlen + net_device->pkt_align <
1008 net_device->send_section_size) {
1009 section_index = msdp->pkt->send_buf_index;
1011 } else if (try_batch && msd_len + packet->rmsg_size <
1012 net_device->send_section_size) {
1013 section_index = msdp->pkt->send_buf_index;
1014 packet->cp_partial = true;
1016 } else if (pktlen + net_device->pkt_align <
1017 net_device->send_section_size) {
1018 section_index = netvsc_get_next_send_section(net_device);
1019 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
1020 ++ndev_ctx->eth_stats.tx_send_full;
1022 move_pkt_msd(&msd_send, &msd_skb, msdp);
1027 /* Keep aggregating only if stack says more data is coming
1028 * and not doing mixed modes send and not flow blocked
1030 xmit_more = netdev_xmit_more() &&
1031 !packet->cp_partial &&
1032 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
1034 if (section_index != NETVSC_INVALID_INDEX) {
1035 netvsc_copy_to_send_buf(net_device,
1036 section_index, msd_len,
1037 packet, rndis_msg, pb, xmit_more);
1039 packet->send_buf_index = section_index;
1041 if (packet->cp_partial) {
1042 packet->page_buf_cnt -= packet->rmsg_pgcnt;
1043 packet->total_data_buflen = msd_len + packet->rmsg_size;
1045 packet->page_buf_cnt = 0;
1046 packet->total_data_buflen += msd_len;
1050 packet->total_packets += msdp->pkt->total_packets;
1051 packet->total_bytes += msdp->pkt->total_bytes;
1055 dev_consume_skb_any(msdp->skb);
1068 move_pkt_msd(&msd_send, &msd_skb, msdp);
1073 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1077 netvsc_free_send_slot(net_device,
1078 msd_send->send_buf_index);
1079 dev_kfree_skb_any(msd_skb);
1084 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1086 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1087 netvsc_free_send_slot(net_device, section_index);
1092 /* Send pending recv completions */
1093 static int send_recv_completions(struct net_device *ndev,
1094 struct netvsc_device *nvdev,
1095 struct netvsc_channel *nvchan)
1097 struct multi_recv_comp *mrc = &nvchan->mrc;
1098 struct recv_comp_msg {
1099 struct nvsp_message_header hdr;
1102 struct recv_comp_msg msg = {
1103 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1107 while (mrc->first != mrc->next) {
1108 const struct recv_comp_data *rcd
1109 = mrc->slots + mrc->first;
1111 msg.status = rcd->status;
1112 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1113 rcd->tid, VM_PKT_COMP, 0);
1114 if (unlikely(ret)) {
1115 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1117 ++ndev_ctx->eth_stats.rx_comp_busy;
1121 if (++mrc->first == nvdev->recv_completion_cnt)
1125 /* receive completion ring has been emptied */
1126 if (unlikely(nvdev->destroy))
1127 wake_up(&nvdev->wait_drain);
1132 /* Count how many receive completions are outstanding */
1133 static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1134 const struct multi_recv_comp *mrc,
1135 u32 *filled, u32 *avail)
1137 u32 count = nvdev->recv_completion_cnt;
1139 if (mrc->next >= mrc->first)
1140 *filled = mrc->next - mrc->first;
1142 *filled = (count - mrc->first) + mrc->next;
1144 *avail = count - *filled - 1;
1147 /* Add receive complete to ring to send to host. */
1148 static void enq_receive_complete(struct net_device *ndev,
1149 struct netvsc_device *nvdev, u16 q_idx,
1150 u64 tid, u32 status)
1152 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1153 struct multi_recv_comp *mrc = &nvchan->mrc;
1154 struct recv_comp_data *rcd;
1157 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1159 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1160 send_recv_completions(ndev, nvdev, nvchan);
1161 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1164 if (unlikely(!avail)) {
1165 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1170 rcd = mrc->slots + mrc->next;
1172 rcd->status = status;
1174 if (++mrc->next == nvdev->recv_completion_cnt)
1178 static int netvsc_receive(struct net_device *ndev,
1179 struct netvsc_device *net_device,
1180 struct netvsc_channel *nvchan,
1181 const struct vmpacket_descriptor *desc)
1183 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1184 struct vmbus_channel *channel = nvchan->channel;
1185 const struct vmtransfer_page_packet_header *vmxferpage_packet
1186 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1187 const struct nvsp_message *nvsp = hv_pkt_data(desc);
1188 u32 msglen = hv_pkt_datalen(desc);
1189 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1190 char *recv_buf = net_device->recv_buf;
1191 u32 status = NVSP_STAT_SUCCESS;
1195 /* Ensure packet is big enough to read header fields */
1196 if (msglen < sizeof(struct nvsp_message_header)) {
1197 netif_err(net_device_ctx, rx_err, ndev,
1198 "invalid nvsp header, length too small: %u\n",
1203 /* Make sure this is a valid nvsp packet */
1204 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1205 netif_err(net_device_ctx, rx_err, ndev,
1206 "Unknown nvsp packet type received %u\n",
1207 nvsp->hdr.msg_type);
1211 /* Validate xfer page pkt header */
1212 if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
1213 netif_err(net_device_ctx, rx_err, ndev,
1214 "Invalid xfer page pkt, offset too small: %u\n",
1215 desc->offset8 << 3);
1219 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1220 netif_err(net_device_ctx, rx_err, ndev,
1221 "Invalid xfer page set id - expecting %x got %x\n",
1222 NETVSC_RECEIVE_BUFFER_ID,
1223 vmxferpage_packet->xfer_pageset_id);
1227 count = vmxferpage_packet->range_cnt;
1229 /* Check count for a valid value */
1230 if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
1231 netif_err(net_device_ctx, rx_err, ndev,
1232 "Range count is not valid: %d\n",
1237 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1238 for (i = 0; i < count; i++) {
1239 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1240 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1244 if (unlikely(offset > net_device->recv_buf_size ||
1245 buflen > net_device->recv_buf_size - offset)) {
1246 nvchan->rsc.cnt = 0;
1247 status = NVSP_STAT_FAIL;
1248 netif_err(net_device_ctx, rx_err, ndev,
1249 "Packet offset:%u + len:%u too big\n",
1255 data = recv_buf + offset;
1257 nvchan->rsc.is_last = (i == count - 1);
1259 trace_rndis_recv(ndev, q_idx, data);
1261 /* Pass it to the upper layer */
1262 ret = rndis_filter_receive(ndev, net_device,
1263 nvchan, data, buflen);
1265 if (unlikely(ret != NVSP_STAT_SUCCESS))
1266 status = NVSP_STAT_FAIL;
1269 enq_receive_complete(ndev, net_device, q_idx,
1270 vmxferpage_packet->d.trans_id, status);
1275 static void netvsc_send_table(struct net_device *ndev,
1276 struct netvsc_device *nvscdev,
1277 const struct nvsp_message *nvmsg,
1280 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1281 u32 count, offset, *tab;
1284 /* Ensure packet is big enough to read send_table fields */
1285 if (msglen < sizeof(struct nvsp_message_header) +
1286 sizeof(struct nvsp_5_send_indirect_table)) {
1287 netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
1291 count = nvmsg->msg.v5_msg.send_table.count;
1292 offset = nvmsg->msg.v5_msg.send_table.offset;
1294 if (count != VRSS_SEND_TAB_SIZE) {
1295 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1299 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1300 * wrong due to a host bug. So fix the offset here.
1302 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1303 msglen >= sizeof(struct nvsp_message_header) +
1304 sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1305 offset = sizeof(struct nvsp_message_header) +
1306 sizeof(union nvsp_6_message_uber);
1308 /* Boundary check for all versions */
1309 if (offset > msglen - count * sizeof(u32)) {
1310 netdev_err(ndev, "Received send-table offset too big:%u\n",
1315 tab = (void *)nvmsg + offset;
1317 for (i = 0; i < count; i++)
1318 net_device_ctx->tx_table[i] = tab[i];
1321 static void netvsc_send_vf(struct net_device *ndev,
1322 const struct nvsp_message *nvmsg,
1325 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1327 /* Ensure packet is big enough to read its fields */
1328 if (msglen < sizeof(struct nvsp_message_header) +
1329 sizeof(struct nvsp_4_send_vf_association)) {
1330 netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
1334 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1335 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1336 netdev_info(ndev, "VF slot %u %s\n",
1337 net_device_ctx->vf_serial,
1338 net_device_ctx->vf_alloc ? "added" : "removed");
1341 static void netvsc_receive_inband(struct net_device *ndev,
1342 struct netvsc_device *nvscdev,
1343 const struct vmpacket_descriptor *desc)
1345 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1346 u32 msglen = hv_pkt_datalen(desc);
1348 /* Ensure packet is big enough to read header fields */
1349 if (msglen < sizeof(struct nvsp_message_header)) {
1350 netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
1354 switch (nvmsg->hdr.msg_type) {
1355 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1356 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1359 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1360 netvsc_send_vf(ndev, nvmsg, msglen);
1365 static int netvsc_process_raw_pkt(struct hv_device *device,
1366 struct netvsc_channel *nvchan,
1367 struct netvsc_device *net_device,
1368 struct net_device *ndev,
1369 const struct vmpacket_descriptor *desc,
1372 struct vmbus_channel *channel = nvchan->channel;
1373 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1375 trace_nvsp_recv(ndev, channel, nvmsg);
1377 switch (desc->type) {
1379 netvsc_send_completion(ndev, net_device, channel, desc, budget);
1382 case VM_PKT_DATA_USING_XFER_PAGES:
1383 return netvsc_receive(ndev, net_device, nvchan, desc);
1386 case VM_PKT_DATA_INBAND:
1387 netvsc_receive_inband(ndev, net_device, desc);
1391 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1392 desc->type, desc->trans_id);
1399 static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1401 struct vmbus_channel *primary = channel->primary_channel;
1403 return primary ? primary->device_obj : channel->device_obj;
1406 /* Network processing softirq
1407 * Process data in incoming ring buffer from host
1408 * Stops when ring is empty or budget is met or exceeded.
1410 int netvsc_poll(struct napi_struct *napi, int budget)
1412 struct netvsc_channel *nvchan
1413 = container_of(napi, struct netvsc_channel, napi);
1414 struct netvsc_device *net_device = nvchan->net_device;
1415 struct vmbus_channel *channel = nvchan->channel;
1416 struct hv_device *device = netvsc_channel_to_device(channel);
1417 struct net_device *ndev = hv_get_drvdata(device);
1421 /* If starting a new interval */
1423 nvchan->desc = hv_pkt_iter_first(channel);
1425 while (nvchan->desc && work_done < budget) {
1426 work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1427 ndev, nvchan->desc, budget);
1428 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1431 /* Send any pending receive completions */
1432 ret = send_recv_completions(ndev, net_device, nvchan);
1434 /* If it did not exhaust NAPI budget this time
1435 * and not doing busy poll
1436 * then re-enable host interrupts
1437 * and reschedule if ring is not empty
1438 * or sending receive completion failed.
1440 if (work_done < budget &&
1441 napi_complete_done(napi, work_done) &&
1442 (ret || hv_end_read(&channel->inbound)) &&
1443 napi_schedule_prep(napi)) {
1444 hv_begin_read(&channel->inbound);
1445 __napi_schedule(napi);
1448 /* Driver may overshoot since multiple packets per descriptor */
1449 return min(work_done, budget);
1452 /* Call back when data is available in host ring buffer.
1453 * Processing is deferred until network softirq (NAPI)
1455 void netvsc_channel_cb(void *context)
1457 struct netvsc_channel *nvchan = context;
1458 struct vmbus_channel *channel = nvchan->channel;
1459 struct hv_ring_buffer_info *rbi = &channel->inbound;
1461 /* preload first vmpacket descriptor */
1462 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1464 if (napi_schedule_prep(&nvchan->napi)) {
1465 /* disable interrupts from host */
1468 __napi_schedule_irqoff(&nvchan->napi);
1473 * netvsc_device_add - Callback when the device belonging to this
1476 struct netvsc_device *netvsc_device_add(struct hv_device *device,
1477 const struct netvsc_device_info *device_info)
1480 struct netvsc_device *net_device;
1481 struct net_device *ndev = hv_get_drvdata(device);
1482 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1484 net_device = alloc_net_device();
1486 return ERR_PTR(-ENOMEM);
1488 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1489 net_device_ctx->tx_table[i] = 0;
1491 /* Because the device uses NAPI, all the interrupt batching and
1492 * control is done via Net softirq, not the channel handling
1494 set_channel_read_mode(device->channel, HV_CALL_ISR);
1496 /* If we're reopening the device we may have multiple queues, fill the
1497 * chn_table with the default channel to use it before subchannels are
1499 * Initialize the channel state before we open;
1500 * we can be interrupted as soon as we open the channel.
1503 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1504 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1506 nvchan->channel = device->channel;
1507 nvchan->net_device = net_device;
1508 u64_stats_init(&nvchan->tx_stats.syncp);
1509 u64_stats_init(&nvchan->rx_stats.syncp);
1511 ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0);
1514 netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
1518 ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
1519 MEM_TYPE_PAGE_SHARED, NULL);
1522 netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
1527 /* Enable NAPI handler before init callbacks */
1528 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1529 netvsc_poll, NAPI_POLL_WEIGHT);
1531 /* Open the channel */
1532 device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1533 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1534 netvsc_ring_bytes, NULL, 0,
1535 netvsc_channel_cb, net_device->chan_table);
1538 netdev_err(ndev, "unable to open channel: %d\n", ret);
1542 /* Channel is opened */
1543 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1545 napi_enable(&net_device->chan_table[0].napi);
1547 /* Connect with the NetVsp */
1548 ret = netvsc_connect_vsp(device, net_device, device_info);
1551 "unable to connect to NetVSP - %d\n", ret);
1555 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1558 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1563 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1564 napi_disable(&net_device->chan_table[0].napi);
1566 /* Now, we can close the channel safely */
1567 vmbus_close(device->channel);
1570 netif_napi_del(&net_device->chan_table[0].napi);
1573 free_netvsc_device(&net_device->rcu);
1575 return ERR_PTR(ret);