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>
25 #include <asm/mshyperv.h>
27 #include "hyperv_net.h"
28 #include "netvsc_trace.h"
31 * Switch the data path from the synthetic interface to the VF
34 int netvsc_switch_datapath(struct net_device *ndev, bool vf)
36 struct net_device_context *net_device_ctx = netdev_priv(ndev);
37 struct hv_device *dev = net_device_ctx->device_ctx;
38 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
39 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
42 /* Block sending traffic to VF if it's about to be gone */
44 net_device_ctx->data_path_is_vf = vf;
46 memset(init_pkt, 0, sizeof(struct nvsp_message));
47 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
49 init_pkt->msg.v4_msg.active_dp.active_datapath =
52 init_pkt->msg.v4_msg.active_dp.active_datapath =
53 NVSP_DATAPATH_SYNTHETIC;
56 trace_nvsp_send(ndev, init_pkt);
58 ret = vmbus_sendpacket(dev->channel, init_pkt,
59 sizeof(struct nvsp_message),
60 (unsigned long)init_pkt, VM_PKT_DATA_INBAND,
61 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
63 /* If failed to switch to/from VF, let data_path_is_vf stay false,
64 * so we use synthetic path to send data.
69 "Unable to send sw datapath msg, err: %d\n",
74 if (retry++ < RETRY_MAX) {
75 usleep_range(RETRY_US_LO, RETRY_US_HI);
80 "Retry failed to send sw datapath msg, err: %d\n",
86 wait_for_completion(&nv_dev->channel_init_wait);
87 net_device_ctx->data_path_is_vf = vf;
92 /* Worker to setup sub channels on initial setup
93 * Initial hotplug event occurs in softirq context
94 * and can't wait for channels.
96 static void netvsc_subchan_work(struct work_struct *w)
98 struct netvsc_device *nvdev =
99 container_of(w, struct netvsc_device, subchan_work);
100 struct rndis_device *rdev;
103 /* Avoid deadlock with device removal already under RTNL */
104 if (!rtnl_trylock()) {
109 rdev = nvdev->extension;
111 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
113 netif_device_attach(rdev->ndev);
115 /* fallback to only primary channel */
116 for (i = 1; i < nvdev->num_chn; i++)
117 netif_napi_del(&nvdev->chan_table[i].napi);
127 static struct netvsc_device *alloc_net_device(void)
129 struct netvsc_device *net_device;
131 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
135 init_waitqueue_head(&net_device->wait_drain);
136 net_device->destroy = false;
137 net_device->tx_disable = true;
139 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
140 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
142 init_completion(&net_device->channel_init_wait);
143 init_waitqueue_head(&net_device->subchan_open);
144 INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
149 static void free_netvsc_device(struct rcu_head *head)
151 struct netvsc_device *nvdev
152 = container_of(head, struct netvsc_device, rcu);
155 kfree(nvdev->extension);
156 vfree(nvdev->recv_buf);
157 vfree(nvdev->send_buf);
158 kfree(nvdev->send_section_map);
160 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
161 xdp_rxq_info_unreg(&nvdev->chan_table[i].xdp_rxq);
162 kfree(nvdev->chan_table[i].recv_buf);
163 vfree(nvdev->chan_table[i].mrc.slots);
169 static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
171 call_rcu(&nvdev->rcu, free_netvsc_device);
174 static void netvsc_revoke_recv_buf(struct hv_device *device,
175 struct netvsc_device *net_device,
176 struct net_device *ndev)
178 struct nvsp_message *revoke_packet;
182 * If we got a section count, it means we received a
183 * SendReceiveBufferComplete msg (ie sent
184 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
185 * to send a revoke msg here
187 if (net_device->recv_section_cnt) {
188 /* Send the revoke receive buffer */
189 revoke_packet = &net_device->revoke_packet;
190 memset(revoke_packet, 0, sizeof(struct nvsp_message));
192 revoke_packet->hdr.msg_type =
193 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
194 revoke_packet->msg.v1_msg.
195 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
197 trace_nvsp_send(ndev, revoke_packet);
199 ret = vmbus_sendpacket(device->channel,
201 sizeof(struct nvsp_message),
202 VMBUS_RQST_ID_NO_RESPONSE,
203 VM_PKT_DATA_INBAND, 0);
204 /* If the failure is because the channel is rescinded;
205 * ignore the failure since we cannot send on a rescinded
206 * channel. This would allow us to properly cleanup
207 * even when the channel is rescinded.
209 if (device->channel->rescind)
212 * If we failed here, we might as well return and
213 * have a leak rather than continue and a bugchk
216 netdev_err(ndev, "unable to send "
217 "revoke receive buffer to netvsp\n");
220 net_device->recv_section_cnt = 0;
224 static void netvsc_revoke_send_buf(struct hv_device *device,
225 struct netvsc_device *net_device,
226 struct net_device *ndev)
228 struct nvsp_message *revoke_packet;
231 /* Deal with the send buffer we may have setup.
232 * If we got a send section size, it means we received a
233 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
234 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
235 * to send a revoke msg here
237 if (net_device->send_section_cnt) {
238 /* Send the revoke receive buffer */
239 revoke_packet = &net_device->revoke_packet;
240 memset(revoke_packet, 0, sizeof(struct nvsp_message));
242 revoke_packet->hdr.msg_type =
243 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
244 revoke_packet->msg.v1_msg.revoke_send_buf.id =
245 NETVSC_SEND_BUFFER_ID;
247 trace_nvsp_send(ndev, revoke_packet);
249 ret = vmbus_sendpacket(device->channel,
251 sizeof(struct nvsp_message),
252 VMBUS_RQST_ID_NO_RESPONSE,
253 VM_PKT_DATA_INBAND, 0);
255 /* If the failure is because the channel is rescinded;
256 * ignore the failure since we cannot send on a rescinded
257 * channel. This would allow us to properly cleanup
258 * even when the channel is rescinded.
260 if (device->channel->rescind)
263 /* If we failed here, we might as well return and
264 * have a leak rather than continue and a bugchk
267 netdev_err(ndev, "unable to send "
268 "revoke send buffer to netvsp\n");
271 net_device->send_section_cnt = 0;
275 static void netvsc_teardown_recv_gpadl(struct hv_device *device,
276 struct netvsc_device *net_device,
277 struct net_device *ndev)
281 if (net_device->recv_buf_gpadl_handle) {
282 ret = vmbus_teardown_gpadl(device->channel,
283 net_device->recv_buf_gpadl_handle);
285 /* If we failed here, we might as well return and have a leak
286 * rather than continue and a bugchk
290 "unable to teardown receive buffer's gpadl\n");
293 net_device->recv_buf_gpadl_handle = 0;
297 static void netvsc_teardown_send_gpadl(struct hv_device *device,
298 struct netvsc_device *net_device,
299 struct net_device *ndev)
303 if (net_device->send_buf_gpadl_handle) {
304 ret = vmbus_teardown_gpadl(device->channel,
305 net_device->send_buf_gpadl_handle);
307 /* If we failed here, we might as well return and have a leak
308 * rather than continue and a bugchk
312 "unable to teardown send buffer's gpadl\n");
315 net_device->send_buf_gpadl_handle = 0;
319 int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
321 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
322 int node = cpu_to_node(nvchan->channel->target_cpu);
325 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
326 nvchan->mrc.slots = vzalloc_node(size, node);
327 if (!nvchan->mrc.slots)
328 nvchan->mrc.slots = vzalloc(size);
330 return nvchan->mrc.slots ? 0 : -ENOMEM;
333 static int netvsc_init_buf(struct hv_device *device,
334 struct netvsc_device *net_device,
335 const struct netvsc_device_info *device_info)
337 struct nvsp_1_message_send_receive_buffer_complete *resp;
338 struct net_device *ndev = hv_get_drvdata(device);
339 struct nvsp_message *init_packet;
340 unsigned int buf_size;
344 /* Get receive buffer area. */
345 buf_size = device_info->recv_sections * device_info->recv_section_size;
346 buf_size = roundup(buf_size, PAGE_SIZE);
348 /* Legacy hosts only allow smaller receive buffer */
349 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
350 buf_size = min_t(unsigned int, buf_size,
351 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
353 net_device->recv_buf = vzalloc(buf_size);
354 if (!net_device->recv_buf) {
356 "unable to allocate receive buffer of size %u\n",
362 net_device->recv_buf_size = buf_size;
365 * Establish the gpadl handle for this buffer on this
366 * channel. Note: This call uses the vmbus connection rather
367 * than the channel to establish the gpadl handle.
369 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
371 &net_device->recv_buf_gpadl_handle);
374 "unable to establish receive buffer's gpadl\n");
378 /* Notify the NetVsp of the gpadl handle */
379 init_packet = &net_device->channel_init_pkt;
380 memset(init_packet, 0, sizeof(struct nvsp_message));
381 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
382 init_packet->msg.v1_msg.send_recv_buf.
383 gpadl_handle = net_device->recv_buf_gpadl_handle;
384 init_packet->msg.v1_msg.
385 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
387 trace_nvsp_send(ndev, init_packet);
389 /* Send the gpadl notification request */
390 ret = vmbus_sendpacket(device->channel, init_packet,
391 sizeof(struct nvsp_message),
392 (unsigned long)init_packet,
394 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
397 "unable to send receive buffer's gpadl to netvsp\n");
401 wait_for_completion(&net_device->channel_init_wait);
403 /* Check the response */
404 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
405 if (resp->status != NVSP_STAT_SUCCESS) {
407 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
413 /* Parse the response */
414 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
415 resp->num_sections, resp->sections[0].sub_alloc_size,
416 resp->sections[0].num_sub_allocs);
418 /* There should only be one section for the entire receive buffer */
419 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
424 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
425 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
427 /* Ensure buffer will not overflow */
428 if (net_device->recv_section_size < NETVSC_MTU_MIN || (u64)net_device->recv_section_size *
429 (u64)net_device->recv_section_cnt > (u64)buf_size) {
430 netdev_err(ndev, "invalid recv_section_size %u\n",
431 net_device->recv_section_size);
436 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
437 struct netvsc_channel *nvchan = &net_device->chan_table[i];
439 nvchan->recv_buf = kzalloc(net_device->recv_section_size, GFP_KERNEL);
440 if (nvchan->recv_buf == NULL) {
446 /* Setup receive completion ring.
447 * Add 1 to the recv_section_cnt because at least one entry in a
448 * ring buffer has to be empty.
450 net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
451 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
455 /* Now setup the send buffer. */
456 buf_size = device_info->send_sections * device_info->send_section_size;
457 buf_size = round_up(buf_size, PAGE_SIZE);
459 net_device->send_buf = vzalloc(buf_size);
460 if (!net_device->send_buf) {
461 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
467 /* Establish the gpadl handle for this buffer on this
468 * channel. Note: This call uses the vmbus connection rather
469 * than the channel to establish the gpadl handle.
471 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
473 &net_device->send_buf_gpadl_handle);
476 "unable to establish send buffer's gpadl\n");
480 /* Notify the NetVsp of the gpadl handle */
481 init_packet = &net_device->channel_init_pkt;
482 memset(init_packet, 0, sizeof(struct nvsp_message));
483 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
484 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
485 net_device->send_buf_gpadl_handle;
486 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
488 trace_nvsp_send(ndev, init_packet);
490 /* Send the gpadl notification request */
491 ret = vmbus_sendpacket(device->channel, init_packet,
492 sizeof(struct nvsp_message),
493 (unsigned long)init_packet,
495 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
498 "unable to send send buffer's gpadl to netvsp\n");
502 wait_for_completion(&net_device->channel_init_wait);
504 /* Check the response */
505 if (init_packet->msg.v1_msg.
506 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
507 netdev_err(ndev, "Unable to complete send buffer "
508 "initialization with NetVsp - status %d\n",
509 init_packet->msg.v1_msg.
510 send_send_buf_complete.status);
515 /* Parse the response */
516 net_device->send_section_size = init_packet->msg.
517 v1_msg.send_send_buf_complete.section_size;
518 if (net_device->send_section_size < NETVSC_MTU_MIN) {
519 netdev_err(ndev, "invalid send_section_size %u\n",
520 net_device->send_section_size);
525 /* Section count is simply the size divided by the section size. */
526 net_device->send_section_cnt = buf_size / net_device->send_section_size;
528 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
529 net_device->send_section_size, net_device->send_section_cnt);
531 /* Setup state for managing the send buffer. */
532 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
534 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
535 if (net_device->send_section_map == NULL) {
543 netvsc_revoke_recv_buf(device, net_device, ndev);
544 netvsc_revoke_send_buf(device, net_device, ndev);
545 netvsc_teardown_recv_gpadl(device, net_device, ndev);
546 netvsc_teardown_send_gpadl(device, net_device, ndev);
552 /* Negotiate NVSP protocol version */
553 static int negotiate_nvsp_ver(struct hv_device *device,
554 struct netvsc_device *net_device,
555 struct nvsp_message *init_packet,
558 struct net_device *ndev = hv_get_drvdata(device);
561 memset(init_packet, 0, sizeof(struct nvsp_message));
562 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
563 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
564 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
565 trace_nvsp_send(ndev, init_packet);
567 /* Send the init request */
568 ret = vmbus_sendpacket(device->channel, init_packet,
569 sizeof(struct nvsp_message),
570 (unsigned long)init_packet,
572 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
577 wait_for_completion(&net_device->channel_init_wait);
579 if (init_packet->msg.init_msg.init_complete.status !=
583 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
586 /* NVSPv2 or later: Send NDIS config */
587 memset(init_packet, 0, sizeof(struct nvsp_message));
588 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
589 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
590 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
592 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
593 if (hv_is_isolation_supported())
594 netdev_info(ndev, "SR-IOV not advertised by guests on the host supporting isolation\n");
596 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
598 /* Teaming bit is needed to receive link speed updates */
599 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
602 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
603 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
605 trace_nvsp_send(ndev, init_packet);
607 ret = vmbus_sendpacket(device->channel, init_packet,
608 sizeof(struct nvsp_message),
609 VMBUS_RQST_ID_NO_RESPONSE,
610 VM_PKT_DATA_INBAND, 0);
615 static int netvsc_connect_vsp(struct hv_device *device,
616 struct netvsc_device *net_device,
617 const struct netvsc_device_info *device_info)
619 struct net_device *ndev = hv_get_drvdata(device);
620 static const u32 ver_list[] = {
621 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
622 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
623 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
625 struct nvsp_message *init_packet;
626 int ndis_version, i, ret;
628 init_packet = &net_device->channel_init_pkt;
630 /* Negotiate the latest NVSP protocol supported */
631 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
632 if (negotiate_nvsp_ver(device, net_device, init_packet,
634 net_device->nvsp_version = ver_list[i];
643 if (hv_is_isolation_supported() && net_device->nvsp_version < NVSP_PROTOCOL_VERSION_61) {
644 netdev_err(ndev, "Invalid NVSP version 0x%x (expected >= 0x%x) from the host supporting isolation\n",
645 net_device->nvsp_version, NVSP_PROTOCOL_VERSION_61);
650 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
652 /* Send the ndis version */
653 memset(init_packet, 0, sizeof(struct nvsp_message));
655 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
656 ndis_version = 0x00060001;
658 ndis_version = 0x0006001e;
660 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
661 init_packet->msg.v1_msg.
662 send_ndis_ver.ndis_major_ver =
663 (ndis_version & 0xFFFF0000) >> 16;
664 init_packet->msg.v1_msg.
665 send_ndis_ver.ndis_minor_ver =
666 ndis_version & 0xFFFF;
668 trace_nvsp_send(ndev, init_packet);
670 /* Send the init request */
671 ret = vmbus_sendpacket(device->channel, init_packet,
672 sizeof(struct nvsp_message),
673 VMBUS_RQST_ID_NO_RESPONSE,
674 VM_PKT_DATA_INBAND, 0);
679 ret = netvsc_init_buf(device, net_device, device_info);
686 * netvsc_device_remove - Callback when the root bus device is removed
688 void netvsc_device_remove(struct hv_device *device)
690 struct net_device *ndev = hv_get_drvdata(device);
691 struct net_device_context *net_device_ctx = netdev_priv(ndev);
692 struct netvsc_device *net_device
693 = rtnl_dereference(net_device_ctx->nvdev);
697 * Revoke receive buffer. If host is pre-Win2016 then tear down
698 * receive buffer GPADL. Do the same for send buffer.
700 netvsc_revoke_recv_buf(device, net_device, ndev);
701 if (vmbus_proto_version < VERSION_WIN10)
702 netvsc_teardown_recv_gpadl(device, net_device, ndev);
704 netvsc_revoke_send_buf(device, net_device, ndev);
705 if (vmbus_proto_version < VERSION_WIN10)
706 netvsc_teardown_send_gpadl(device, net_device, ndev);
708 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
710 /* Disable NAPI and disassociate its context from the device. */
711 for (i = 0; i < net_device->num_chn; i++) {
712 /* See also vmbus_reset_channel_cb(). */
713 napi_disable(&net_device->chan_table[i].napi);
714 netif_napi_del(&net_device->chan_table[i].napi);
718 * At this point, no one should be accessing net_device
721 netdev_dbg(ndev, "net device safe to remove\n");
723 /* Now, we can close the channel safely */
724 vmbus_close(device->channel);
727 * If host is Win2016 or higher then we do the GPADL tear down
728 * here after VMBus is closed.
730 if (vmbus_proto_version >= VERSION_WIN10) {
731 netvsc_teardown_recv_gpadl(device, net_device, ndev);
732 netvsc_teardown_send_gpadl(device, net_device, ndev);
735 /* Release all resources */
736 free_netvsc_device_rcu(net_device);
739 #define RING_AVAIL_PERCENT_HIWATER 20
740 #define RING_AVAIL_PERCENT_LOWATER 10
742 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
745 sync_change_bit(index, net_device->send_section_map);
748 static void netvsc_send_tx_complete(struct net_device *ndev,
749 struct netvsc_device *net_device,
750 struct vmbus_channel *channel,
751 const struct vmpacket_descriptor *desc,
754 struct net_device_context *ndev_ctx = netdev_priv(ndev);
760 cmd_rqst = vmbus_request_addr(&channel->requestor, (u64)desc->trans_id);
761 if (cmd_rqst == VMBUS_RQST_ERROR) {
762 netdev_err(ndev, "Incorrect transaction id\n");
766 skb = (struct sk_buff *)(unsigned long)cmd_rqst;
768 /* Notify the layer above us */
770 const struct hv_netvsc_packet *packet
771 = (struct hv_netvsc_packet *)skb->cb;
772 u32 send_index = packet->send_buf_index;
773 struct netvsc_stats *tx_stats;
775 if (send_index != NETVSC_INVALID_INDEX)
776 netvsc_free_send_slot(net_device, send_index);
777 q_idx = packet->q_idx;
779 tx_stats = &net_device->chan_table[q_idx].tx_stats;
781 u64_stats_update_begin(&tx_stats->syncp);
782 tx_stats->packets += packet->total_packets;
783 tx_stats->bytes += packet->total_bytes;
784 u64_stats_update_end(&tx_stats->syncp);
786 napi_consume_skb(skb, budget);
790 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
792 if (unlikely(net_device->destroy)) {
793 if (queue_sends == 0)
794 wake_up(&net_device->wait_drain);
796 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
798 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
799 (hv_get_avail_to_write_percent(&channel->outbound) >
800 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
801 netif_tx_wake_queue(txq);
802 ndev_ctx->eth_stats.wake_queue++;
807 static void netvsc_send_completion(struct net_device *ndev,
808 struct netvsc_device *net_device,
809 struct vmbus_channel *incoming_channel,
810 const struct vmpacket_descriptor *desc,
813 const struct nvsp_message *nvsp_packet;
814 u32 msglen = hv_pkt_datalen(desc);
815 struct nvsp_message *pkt_rqst;
818 /* First check if this is a VMBUS completion without data payload */
820 cmd_rqst = vmbus_request_addr(&incoming_channel->requestor,
821 (u64)desc->trans_id);
822 if (cmd_rqst == VMBUS_RQST_ERROR) {
823 netdev_err(ndev, "Invalid transaction id\n");
827 pkt_rqst = (struct nvsp_message *)(uintptr_t)cmd_rqst;
828 switch (pkt_rqst->hdr.msg_type) {
829 case NVSP_MSG4_TYPE_SWITCH_DATA_PATH:
830 complete(&net_device->channel_init_wait);
834 netdev_err(ndev, "Unexpected VMBUS completion!!\n");
839 /* Ensure packet is big enough to read header fields */
840 if (msglen < sizeof(struct nvsp_message_header)) {
841 netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
845 nvsp_packet = hv_pkt_data(desc);
846 switch (nvsp_packet->hdr.msg_type) {
847 case NVSP_MSG_TYPE_INIT_COMPLETE:
848 if (msglen < sizeof(struct nvsp_message_header) +
849 sizeof(struct nvsp_message_init_complete)) {
850 netdev_err(ndev, "nvsp_msg length too small: %u\n",
856 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
857 if (msglen < sizeof(struct nvsp_message_header) +
858 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
859 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
865 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
866 if (msglen < sizeof(struct nvsp_message_header) +
867 sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
868 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
874 case NVSP_MSG5_TYPE_SUBCHANNEL:
875 if (msglen < sizeof(struct nvsp_message_header) +
876 sizeof(struct nvsp_5_subchannel_complete)) {
877 netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
881 /* Copy the response back */
882 memcpy(&net_device->channel_init_pkt, nvsp_packet,
883 sizeof(struct nvsp_message));
884 complete(&net_device->channel_init_wait);
887 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
888 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
894 "Unknown send completion type %d received!!\n",
895 nvsp_packet->hdr.msg_type);
899 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
901 unsigned long *map_addr = net_device->send_section_map;
904 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
905 if (sync_test_and_set_bit(i, map_addr) == 0)
909 return NETVSC_INVALID_INDEX;
912 static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
913 unsigned int section_index,
915 struct hv_netvsc_packet *packet,
916 struct rndis_message *rndis_msg,
917 struct hv_page_buffer *pb,
920 char *start = net_device->send_buf;
921 char *dest = start + (section_index * net_device->send_section_size)
925 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
926 packet->page_buf_cnt;
930 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
931 if (xmit_more && remain) {
932 padding = net_device->pkt_align - remain;
933 rndis_msg->msg_len += padding;
934 packet->total_data_buflen += padding;
937 for (i = 0; i < page_count; i++) {
938 char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
939 u32 offset = pb[i].offset;
942 memcpy(dest, (src + offset), len);
947 memset(dest, 0, padding);
950 static inline int netvsc_send_pkt(
951 struct hv_device *device,
952 struct hv_netvsc_packet *packet,
953 struct netvsc_device *net_device,
954 struct hv_page_buffer *pb,
957 struct nvsp_message nvmsg;
958 struct nvsp_1_message_send_rndis_packet *rpkt =
959 &nvmsg.msg.v1_msg.send_rndis_pkt;
960 struct netvsc_channel * const nvchan =
961 &net_device->chan_table[packet->q_idx];
962 struct vmbus_channel *out_channel = nvchan->channel;
963 struct net_device *ndev = hv_get_drvdata(device);
964 struct net_device_context *ndev_ctx = netdev_priv(ndev);
965 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
968 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
970 memset(&nvmsg, 0, sizeof(struct nvsp_message));
971 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
973 rpkt->channel_type = 0; /* 0 is RMC_DATA */
975 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
977 rpkt->send_buf_section_index = packet->send_buf_index;
978 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
979 rpkt->send_buf_section_size = 0;
981 rpkt->send_buf_section_size = packet->total_data_buflen;
985 if (out_channel->rescind)
988 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
990 if (packet->page_buf_cnt) {
991 if (packet->cp_partial)
992 pb += packet->rmsg_pgcnt;
994 ret = vmbus_sendpacket_pagebuffer(out_channel,
995 pb, packet->page_buf_cnt,
996 &nvmsg, sizeof(nvmsg),
999 ret = vmbus_sendpacket(out_channel,
1000 &nvmsg, sizeof(nvmsg),
1001 req_id, VM_PKT_DATA_INBAND,
1002 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1006 atomic_inc_return(&nvchan->queue_sends);
1008 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
1009 netif_tx_stop_queue(txq);
1010 ndev_ctx->eth_stats.stop_queue++;
1012 } else if (ret == -EAGAIN) {
1013 netif_tx_stop_queue(txq);
1014 ndev_ctx->eth_stats.stop_queue++;
1017 "Unable to send packet pages %u len %u, ret %d\n",
1018 packet->page_buf_cnt, packet->total_data_buflen,
1022 if (netif_tx_queue_stopped(txq) &&
1023 atomic_read(&nvchan->queue_sends) < 1 &&
1024 !net_device->tx_disable) {
1025 netif_tx_wake_queue(txq);
1026 ndev_ctx->eth_stats.wake_queue++;
1034 /* Move packet out of multi send data (msd), and clear msd */
1035 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
1036 struct sk_buff **msd_skb,
1037 struct multi_send_data *msdp)
1039 *msd_skb = msdp->skb;
1040 *msd_send = msdp->pkt;
1046 /* RCU already held by caller */
1047 /* Batching/bouncing logic is designed to attempt to optimize
1050 * For small, non-LSO packets we copy the packet to a send buffer
1051 * which is pre-registered with the Hyper-V side. This enables the
1052 * hypervisor to avoid remapping the aperture to access the packet
1053 * descriptor and data.
1055 * If we already started using a buffer and the netdev is transmitting
1056 * a burst of packets, keep on copying into the buffer until it is
1057 * full or we are done collecting a burst. If there is an existing
1058 * buffer with space for the RNDIS descriptor but not the packet, copy
1059 * the RNDIS descriptor to the buffer, keeping the packet in place.
1061 * If we do batching and send more than one packet using a single
1062 * NetVSC message, free the SKBs of the packets copied, except for the
1063 * last packet. This is done to streamline the handling of the case
1064 * where the last packet only had the RNDIS descriptor copied to the
1065 * send buffer, with the data pointers included in the NetVSC message.
1067 int netvsc_send(struct net_device *ndev,
1068 struct hv_netvsc_packet *packet,
1069 struct rndis_message *rndis_msg,
1070 struct hv_page_buffer *pb,
1071 struct sk_buff *skb,
1074 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1075 struct netvsc_device *net_device
1076 = rcu_dereference_bh(ndev_ctx->nvdev);
1077 struct hv_device *device = ndev_ctx->device_ctx;
1079 struct netvsc_channel *nvchan;
1080 u32 pktlen = packet->total_data_buflen, msd_len = 0;
1081 unsigned int section_index = NETVSC_INVALID_INDEX;
1082 struct multi_send_data *msdp;
1083 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
1084 struct sk_buff *msd_skb = NULL;
1085 bool try_batch, xmit_more;
1087 /* If device is rescinded, return error and packet will get dropped. */
1088 if (unlikely(!net_device || net_device->destroy))
1091 nvchan = &net_device->chan_table[packet->q_idx];
1092 packet->send_buf_index = NETVSC_INVALID_INDEX;
1093 packet->cp_partial = false;
1095 /* Send a control message or XDP packet directly without accessing
1096 * msd (Multi-Send Data) field which may be changed during data packet
1100 return netvsc_send_pkt(device, packet, net_device, pb, skb);
1102 /* batch packets in send buffer if possible */
1103 msdp = &nvchan->msd;
1105 msd_len = msdp->pkt->total_data_buflen;
1107 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
1108 if (try_batch && msd_len + pktlen + net_device->pkt_align <
1109 net_device->send_section_size) {
1110 section_index = msdp->pkt->send_buf_index;
1112 } else if (try_batch && msd_len + packet->rmsg_size <
1113 net_device->send_section_size) {
1114 section_index = msdp->pkt->send_buf_index;
1115 packet->cp_partial = true;
1117 } else if (pktlen + net_device->pkt_align <
1118 net_device->send_section_size) {
1119 section_index = netvsc_get_next_send_section(net_device);
1120 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
1121 ++ndev_ctx->eth_stats.tx_send_full;
1123 move_pkt_msd(&msd_send, &msd_skb, msdp);
1128 /* Keep aggregating only if stack says more data is coming
1129 * and not doing mixed modes send and not flow blocked
1131 xmit_more = netdev_xmit_more() &&
1132 !packet->cp_partial &&
1133 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
1135 if (section_index != NETVSC_INVALID_INDEX) {
1136 netvsc_copy_to_send_buf(net_device,
1137 section_index, msd_len,
1138 packet, rndis_msg, pb, xmit_more);
1140 packet->send_buf_index = section_index;
1142 if (packet->cp_partial) {
1143 packet->page_buf_cnt -= packet->rmsg_pgcnt;
1144 packet->total_data_buflen = msd_len + packet->rmsg_size;
1146 packet->page_buf_cnt = 0;
1147 packet->total_data_buflen += msd_len;
1151 packet->total_packets += msdp->pkt->total_packets;
1152 packet->total_bytes += msdp->pkt->total_bytes;
1156 dev_consume_skb_any(msdp->skb);
1169 move_pkt_msd(&msd_send, &msd_skb, msdp);
1174 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1178 netvsc_free_send_slot(net_device,
1179 msd_send->send_buf_index);
1180 dev_kfree_skb_any(msd_skb);
1185 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1187 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1188 netvsc_free_send_slot(net_device, section_index);
1193 /* Send pending recv completions */
1194 static int send_recv_completions(struct net_device *ndev,
1195 struct netvsc_device *nvdev,
1196 struct netvsc_channel *nvchan)
1198 struct multi_recv_comp *mrc = &nvchan->mrc;
1199 struct recv_comp_msg {
1200 struct nvsp_message_header hdr;
1203 struct recv_comp_msg msg = {
1204 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1208 while (mrc->first != mrc->next) {
1209 const struct recv_comp_data *rcd
1210 = mrc->slots + mrc->first;
1212 msg.status = rcd->status;
1213 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1214 rcd->tid, VM_PKT_COMP, 0);
1215 if (unlikely(ret)) {
1216 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1218 ++ndev_ctx->eth_stats.rx_comp_busy;
1222 if (++mrc->first == nvdev->recv_completion_cnt)
1226 /* receive completion ring has been emptied */
1227 if (unlikely(nvdev->destroy))
1228 wake_up(&nvdev->wait_drain);
1233 /* Count how many receive completions are outstanding */
1234 static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1235 const struct multi_recv_comp *mrc,
1236 u32 *filled, u32 *avail)
1238 u32 count = nvdev->recv_completion_cnt;
1240 if (mrc->next >= mrc->first)
1241 *filled = mrc->next - mrc->first;
1243 *filled = (count - mrc->first) + mrc->next;
1245 *avail = count - *filled - 1;
1248 /* Add receive complete to ring to send to host. */
1249 static void enq_receive_complete(struct net_device *ndev,
1250 struct netvsc_device *nvdev, u16 q_idx,
1251 u64 tid, u32 status)
1253 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1254 struct multi_recv_comp *mrc = &nvchan->mrc;
1255 struct recv_comp_data *rcd;
1258 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1260 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1261 send_recv_completions(ndev, nvdev, nvchan);
1262 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1265 if (unlikely(!avail)) {
1266 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1271 rcd = mrc->slots + mrc->next;
1273 rcd->status = status;
1275 if (++mrc->next == nvdev->recv_completion_cnt)
1279 static int netvsc_receive(struct net_device *ndev,
1280 struct netvsc_device *net_device,
1281 struct netvsc_channel *nvchan,
1282 const struct vmpacket_descriptor *desc)
1284 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1285 struct vmbus_channel *channel = nvchan->channel;
1286 const struct vmtransfer_page_packet_header *vmxferpage_packet
1287 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1288 const struct nvsp_message *nvsp = hv_pkt_data(desc);
1289 u32 msglen = hv_pkt_datalen(desc);
1290 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1291 char *recv_buf = net_device->recv_buf;
1292 u32 status = NVSP_STAT_SUCCESS;
1296 /* Ensure packet is big enough to read header fields */
1297 if (msglen < sizeof(struct nvsp_message_header)) {
1298 netif_err(net_device_ctx, rx_err, ndev,
1299 "invalid nvsp header, length too small: %u\n",
1304 /* Make sure this is a valid nvsp packet */
1305 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1306 netif_err(net_device_ctx, rx_err, ndev,
1307 "Unknown nvsp packet type received %u\n",
1308 nvsp->hdr.msg_type);
1312 /* Validate xfer page pkt header */
1313 if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
1314 netif_err(net_device_ctx, rx_err, ndev,
1315 "Invalid xfer page pkt, offset too small: %u\n",
1316 desc->offset8 << 3);
1320 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1321 netif_err(net_device_ctx, rx_err, ndev,
1322 "Invalid xfer page set id - expecting %x got %x\n",
1323 NETVSC_RECEIVE_BUFFER_ID,
1324 vmxferpage_packet->xfer_pageset_id);
1328 count = vmxferpage_packet->range_cnt;
1330 /* Check count for a valid value */
1331 if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
1332 netif_err(net_device_ctx, rx_err, ndev,
1333 "Range count is not valid: %d\n",
1338 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1339 for (i = 0; i < count; i++) {
1340 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1341 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1345 if (unlikely(offset > net_device->recv_buf_size ||
1346 buflen > net_device->recv_buf_size - offset)) {
1347 nvchan->rsc.cnt = 0;
1348 status = NVSP_STAT_FAIL;
1349 netif_err(net_device_ctx, rx_err, ndev,
1350 "Packet offset:%u + len:%u too big\n",
1356 /* We're going to copy (sections of) the packet into nvchan->recv_buf;
1357 * make sure that nvchan->recv_buf is large enough to hold the packet.
1359 if (unlikely(buflen > net_device->recv_section_size)) {
1360 nvchan->rsc.cnt = 0;
1361 status = NVSP_STAT_FAIL;
1362 netif_err(net_device_ctx, rx_err, ndev,
1363 "Packet too big: buflen=%u recv_section_size=%u\n",
1364 buflen, net_device->recv_section_size);
1369 data = recv_buf + offset;
1371 nvchan->rsc.is_last = (i == count - 1);
1373 trace_rndis_recv(ndev, q_idx, data);
1375 /* Pass it to the upper layer */
1376 ret = rndis_filter_receive(ndev, net_device,
1377 nvchan, data, buflen);
1379 if (unlikely(ret != NVSP_STAT_SUCCESS)) {
1380 /* Drop incomplete packet */
1381 nvchan->rsc.cnt = 0;
1382 status = NVSP_STAT_FAIL;
1386 enq_receive_complete(ndev, net_device, q_idx,
1387 vmxferpage_packet->d.trans_id, status);
1392 static void netvsc_send_table(struct net_device *ndev,
1393 struct netvsc_device *nvscdev,
1394 const struct nvsp_message *nvmsg,
1397 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1398 u32 count, offset, *tab;
1401 /* Ensure packet is big enough to read send_table fields */
1402 if (msglen < sizeof(struct nvsp_message_header) +
1403 sizeof(struct nvsp_5_send_indirect_table)) {
1404 netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
1408 count = nvmsg->msg.v5_msg.send_table.count;
1409 offset = nvmsg->msg.v5_msg.send_table.offset;
1411 if (count != VRSS_SEND_TAB_SIZE) {
1412 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1416 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1417 * wrong due to a host bug. So fix the offset here.
1419 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1420 msglen >= sizeof(struct nvsp_message_header) +
1421 sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1422 offset = sizeof(struct nvsp_message_header) +
1423 sizeof(union nvsp_6_message_uber);
1425 /* Boundary check for all versions */
1426 if (msglen < count * sizeof(u32) || offset > msglen - count * sizeof(u32)) {
1427 netdev_err(ndev, "Received send-table offset too big:%u\n",
1432 tab = (void *)nvmsg + offset;
1434 for (i = 0; i < count; i++)
1435 net_device_ctx->tx_table[i] = tab[i];
1438 static void netvsc_send_vf(struct net_device *ndev,
1439 const struct nvsp_message *nvmsg,
1442 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1444 /* Ensure packet is big enough to read its fields */
1445 if (msglen < sizeof(struct nvsp_message_header) +
1446 sizeof(struct nvsp_4_send_vf_association)) {
1447 netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
1451 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1452 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1453 netdev_info(ndev, "VF slot %u %s\n",
1454 net_device_ctx->vf_serial,
1455 net_device_ctx->vf_alloc ? "added" : "removed");
1458 static void netvsc_receive_inband(struct net_device *ndev,
1459 struct netvsc_device *nvscdev,
1460 const struct vmpacket_descriptor *desc)
1462 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1463 u32 msglen = hv_pkt_datalen(desc);
1465 /* Ensure packet is big enough to read header fields */
1466 if (msglen < sizeof(struct nvsp_message_header)) {
1467 netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
1471 switch (nvmsg->hdr.msg_type) {
1472 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1473 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1476 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1477 if (hv_is_isolation_supported())
1478 netdev_err(ndev, "Ignore VF_ASSOCIATION msg from the host supporting isolation\n");
1480 netvsc_send_vf(ndev, nvmsg, msglen);
1485 static int netvsc_process_raw_pkt(struct hv_device *device,
1486 struct netvsc_channel *nvchan,
1487 struct netvsc_device *net_device,
1488 struct net_device *ndev,
1489 const struct vmpacket_descriptor *desc,
1492 struct vmbus_channel *channel = nvchan->channel;
1493 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1495 trace_nvsp_recv(ndev, channel, nvmsg);
1497 switch (desc->type) {
1499 netvsc_send_completion(ndev, net_device, channel, desc, budget);
1502 case VM_PKT_DATA_USING_XFER_PAGES:
1503 return netvsc_receive(ndev, net_device, nvchan, desc);
1506 case VM_PKT_DATA_INBAND:
1507 netvsc_receive_inband(ndev, net_device, desc);
1511 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1512 desc->type, desc->trans_id);
1519 static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1521 struct vmbus_channel *primary = channel->primary_channel;
1523 return primary ? primary->device_obj : channel->device_obj;
1526 /* Network processing softirq
1527 * Process data in incoming ring buffer from host
1528 * Stops when ring is empty or budget is met or exceeded.
1530 int netvsc_poll(struct napi_struct *napi, int budget)
1532 struct netvsc_channel *nvchan
1533 = container_of(napi, struct netvsc_channel, napi);
1534 struct netvsc_device *net_device = nvchan->net_device;
1535 struct vmbus_channel *channel = nvchan->channel;
1536 struct hv_device *device = netvsc_channel_to_device(channel);
1537 struct net_device *ndev = hv_get_drvdata(device);
1541 /* If starting a new interval */
1543 nvchan->desc = hv_pkt_iter_first(channel);
1545 while (nvchan->desc && work_done < budget) {
1546 work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1547 ndev, nvchan->desc, budget);
1548 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1551 /* Send any pending receive completions */
1552 ret = send_recv_completions(ndev, net_device, nvchan);
1554 /* If it did not exhaust NAPI budget this time
1555 * and not doing busy poll
1556 * then re-enable host interrupts
1557 * and reschedule if ring is not empty
1558 * or sending receive completion failed.
1560 if (work_done < budget &&
1561 napi_complete_done(napi, work_done) &&
1562 (ret || hv_end_read(&channel->inbound)) &&
1563 napi_schedule_prep(napi)) {
1564 hv_begin_read(&channel->inbound);
1565 __napi_schedule(napi);
1568 /* Driver may overshoot since multiple packets per descriptor */
1569 return min(work_done, budget);
1572 /* Call back when data is available in host ring buffer.
1573 * Processing is deferred until network softirq (NAPI)
1575 void netvsc_channel_cb(void *context)
1577 struct netvsc_channel *nvchan = context;
1578 struct vmbus_channel *channel = nvchan->channel;
1579 struct hv_ring_buffer_info *rbi = &channel->inbound;
1581 /* preload first vmpacket descriptor */
1582 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1584 if (napi_schedule_prep(&nvchan->napi)) {
1585 /* disable interrupts from host */
1588 __napi_schedule_irqoff(&nvchan->napi);
1593 * netvsc_device_add - Callback when the device belonging to this
1596 struct netvsc_device *netvsc_device_add(struct hv_device *device,
1597 const struct netvsc_device_info *device_info)
1600 struct netvsc_device *net_device;
1601 struct net_device *ndev = hv_get_drvdata(device);
1602 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1604 net_device = alloc_net_device();
1606 return ERR_PTR(-ENOMEM);
1608 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1609 net_device_ctx->tx_table[i] = 0;
1611 /* Because the device uses NAPI, all the interrupt batching and
1612 * control is done via Net softirq, not the channel handling
1614 set_channel_read_mode(device->channel, HV_CALL_ISR);
1616 /* If we're reopening the device we may have multiple queues, fill the
1617 * chn_table with the default channel to use it before subchannels are
1619 * Initialize the channel state before we open;
1620 * we can be interrupted as soon as we open the channel.
1623 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1624 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1626 nvchan->channel = device->channel;
1627 nvchan->net_device = net_device;
1628 u64_stats_init(&nvchan->tx_stats.syncp);
1629 u64_stats_init(&nvchan->rx_stats.syncp);
1631 ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i, 0);
1634 netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
1638 ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
1639 MEM_TYPE_PAGE_SHARED, NULL);
1642 netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
1647 /* Enable NAPI handler before init callbacks */
1648 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1649 netvsc_poll, NAPI_POLL_WEIGHT);
1651 /* Open the channel */
1652 device->channel->rqstor_size = netvsc_rqstor_size(netvsc_ring_bytes);
1653 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1654 netvsc_ring_bytes, NULL, 0,
1655 netvsc_channel_cb, net_device->chan_table);
1658 netdev_err(ndev, "unable to open channel: %d\n", ret);
1662 /* Channel is opened */
1663 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1665 napi_enable(&net_device->chan_table[0].napi);
1667 /* Connect with the NetVsp */
1668 ret = netvsc_connect_vsp(device, net_device, device_info);
1671 "unable to connect to NetVSP - %d\n", ret);
1675 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1678 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1683 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1684 napi_disable(&net_device->chan_table[0].napi);
1686 /* Now, we can close the channel safely */
1687 vmbus_close(device->channel);
1690 netif_napi_del(&net_device->chan_table[0].napi);
1693 free_netvsc_device(&net_device->rcu);
1695 return ERR_PTR(ret);