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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2009, Microsoft Corporation.
4 *
5 * Authors:
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
8 */
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/wait.h>
14#include <linux/mm.h>
15#include <linux/delay.h>
16#include <linux/io.h>
17#include <linux/slab.h>
18#include <linux/netdevice.h>
19#include <linux/if_ether.h>
20#include <linux/vmalloc.h>
21#include <linux/rtnetlink.h>
22#include <linux/prefetch.h>
23
24#include <asm/sync_bitops.h>
25
26#include "hyperv_net.h"
27#include "netvsc_trace.h"
28
29/*
30 * Switch the data path from the synthetic interface to the VF
31 * interface.
32 */
33void netvsc_switch_datapath(struct net_device *ndev, bool vf)
34{
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;
39
40 memset(init_pkt, 0, sizeof(struct nvsp_message));
41 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
42 if (vf)
43 init_pkt->msg.v4_msg.active_dp.active_datapath =
44 NVSP_DATAPATH_VF;
45 else
46 init_pkt->msg.v4_msg.active_dp.active_datapath =
47 NVSP_DATAPATH_SYNTHETIC;
48
49 trace_nvsp_send(ndev, init_pkt);
50
51 vmbus_sendpacket(dev->channel, init_pkt,
52 sizeof(struct nvsp_message),
53 (unsigned long)init_pkt,
54 VM_PKT_DATA_INBAND, 0);
55}
56
57/* Worker to setup sub channels on initial setup
58 * Initial hotplug event occurs in softirq context
59 * and can't wait for channels.
60 */
61static void netvsc_subchan_work(struct work_struct *w)
62{
63 struct netvsc_device *nvdev =
64 container_of(w, struct netvsc_device, subchan_work);
65 struct rndis_device *rdev;
66 int i, ret;
67
68 /* Avoid deadlock with device removal already under RTNL */
69 if (!rtnl_trylock()) {
70 schedule_work(w);
71 return;
72 }
73
74 rdev = nvdev->extension;
75 if (rdev) {
76 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
77 if (ret == 0) {
78 netif_device_attach(rdev->ndev);
79 } else {
80 /* fallback to only primary channel */
81 for (i = 1; i < nvdev->num_chn; i++)
82 netif_napi_del(&nvdev->chan_table[i].napi);
83
84 nvdev->max_chn = 1;
85 nvdev->num_chn = 1;
86 }
87 }
88
89 rtnl_unlock();
90}
91
92static struct netvsc_device *alloc_net_device(void)
93{
94 struct netvsc_device *net_device;
95
96 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
97 if (!net_device)
98 return NULL;
99
100 init_waitqueue_head(&net_device->wait_drain);
101 net_device->destroy = false;
102 net_device->tx_disable = true;
103
104 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
105 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
106
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);
110
111 return net_device;
112}
113
114static void free_netvsc_device(struct rcu_head *head)
115{
116 struct netvsc_device *nvdev
117 = container_of(head, struct netvsc_device, rcu);
118 int i;
119
120 kfree(nvdev->extension);
121 vfree(nvdev->recv_buf);
122 vfree(nvdev->send_buf);
123 kfree(nvdev->send_section_map);
124
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);
128 }
129
130 kfree(nvdev);
131}
132
133static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
134{
135 call_rcu(&nvdev->rcu, free_netvsc_device);
136}
137
138static void netvsc_revoke_recv_buf(struct hv_device *device,
139 struct netvsc_device *net_device,
140 struct net_device *ndev)
141{
142 struct nvsp_message *revoke_packet;
143 int ret;
144
145 /*
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
150 */
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));
155
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;
160
161 trace_nvsp_send(ndev, revoke_packet);
162
163 ret = vmbus_sendpacket(device->channel,
164 revoke_packet,
165 sizeof(struct nvsp_message),
166 (unsigned long)revoke_packet,
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.
172 */
173 if (device->channel->rescind)
174 ret = 0;
175 /*
176 * If we failed here, we might as well return and
177 * have a leak rather than continue and a bugchk
178 */
179 if (ret != 0) {
180 netdev_err(ndev, "unable to send "
181 "revoke receive buffer to netvsp\n");
182 return;
183 }
184 net_device->recv_section_cnt = 0;
185 }
186}
187
188static void netvsc_revoke_send_buf(struct hv_device *device,
189 struct netvsc_device *net_device,
190 struct net_device *ndev)
191{
192 struct nvsp_message *revoke_packet;
193 int ret;
194
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
200 */
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));
205
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;
210
211 trace_nvsp_send(ndev, revoke_packet);
212
213 ret = vmbus_sendpacket(device->channel,
214 revoke_packet,
215 sizeof(struct nvsp_message),
216 (unsigned long)revoke_packet,
217 VM_PKT_DATA_INBAND, 0);
218
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.
223 */
224 if (device->channel->rescind)
225 ret = 0;
226
227 /* If we failed here, we might as well return and
228 * have a leak rather than continue and a bugchk
229 */
230 if (ret != 0) {
231 netdev_err(ndev, "unable to send "
232 "revoke send buffer to netvsp\n");
233 return;
234 }
235 net_device->send_section_cnt = 0;
236 }
237}
238
239static void netvsc_teardown_recv_gpadl(struct hv_device *device,
240 struct netvsc_device *net_device,
241 struct net_device *ndev)
242{
243 int ret;
244
245 if (net_device->recv_buf_gpadl_handle) {
246 ret = vmbus_teardown_gpadl(device->channel,
247 net_device->recv_buf_gpadl_handle);
248
249 /* If we failed here, we might as well return and have a leak
250 * rather than continue and a bugchk
251 */
252 if (ret != 0) {
253 netdev_err(ndev,
254 "unable to teardown receive buffer's gpadl\n");
255 return;
256 }
257 net_device->recv_buf_gpadl_handle = 0;
258 }
259}
260
261static void netvsc_teardown_send_gpadl(struct hv_device *device,
262 struct netvsc_device *net_device,
263 struct net_device *ndev)
264{
265 int ret;
266
267 if (net_device->send_buf_gpadl_handle) {
268 ret = vmbus_teardown_gpadl(device->channel,
269 net_device->send_buf_gpadl_handle);
270
271 /* If we failed here, we might as well return and have a leak
272 * rather than continue and a bugchk
273 */
274 if (ret != 0) {
275 netdev_err(ndev,
276 "unable to teardown send buffer's gpadl\n");
277 return;
278 }
279 net_device->send_buf_gpadl_handle = 0;
280 }
281}
282
283int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
284{
285 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
286 int node = cpu_to_node(nvchan->channel->target_cpu);
287 size_t size;
288
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);
293
294 return nvchan->mrc.slots ? 0 : -ENOMEM;
295}
296
297static int netvsc_init_buf(struct hv_device *device,
298 struct netvsc_device *net_device,
299 const struct netvsc_device_info *device_info)
300{
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;
305 size_t map_words;
306 int ret = 0;
307
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);
311
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);
316
317 net_device->recv_buf = vzalloc(buf_size);
318 if (!net_device->recv_buf) {
319 netdev_err(ndev,
320 "unable to allocate receive buffer of size %u\n",
321 buf_size);
322 ret = -ENOMEM;
323 goto cleanup;
324 }
325
326 net_device->recv_buf_size = buf_size;
327
328 /*
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.
332 */
333 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
334 buf_size,
335 &net_device->recv_buf_gpadl_handle);
336 if (ret != 0) {
337 netdev_err(ndev,
338 "unable to establish receive buffer's gpadl\n");
339 goto cleanup;
340 }
341
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;
350
351 trace_nvsp_send(ndev, init_packet);
352
353 /* Send the gpadl notification request */
354 ret = vmbus_sendpacket(device->channel, init_packet,
355 sizeof(struct nvsp_message),
356 (unsigned long)init_packet,
357 VM_PKT_DATA_INBAND,
358 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
359 if (ret != 0) {
360 netdev_err(ndev,
361 "unable to send receive buffer's gpadl to netvsp\n");
362 goto cleanup;
363 }
364
365 wait_for_completion(&net_device->channel_init_wait);
366
367 /* Check the response */
368 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
369 if (resp->status != NVSP_STAT_SUCCESS) {
370 netdev_err(ndev,
371 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
372 resp->status);
373 ret = -EINVAL;
374 goto cleanup;
375 }
376
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);
381
382 /* There should only be one section for the entire receive buffer */
383 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
384 ret = -EINVAL;
385 goto cleanup;
386 }
387
388 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
389 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
390
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);
396 ret = -EINVAL;
397 goto cleanup;
398 }
399
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.
403 */
404 net_device->recv_completion_cnt = net_device->recv_section_cnt + 1;
405 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
406 if (ret)
407 goto cleanup;
408
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);
412
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",
416 buf_size);
417 ret = -ENOMEM;
418 goto cleanup;
419 }
420
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.
424 */
425 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
426 buf_size,
427 &net_device->send_buf_gpadl_handle);
428 if (ret != 0) {
429 netdev_err(ndev,
430 "unable to establish send buffer's gpadl\n");
431 goto cleanup;
432 }
433
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;
441
442 trace_nvsp_send(ndev, init_packet);
443
444 /* Send the gpadl notification request */
445 ret = vmbus_sendpacket(device->channel, init_packet,
446 sizeof(struct nvsp_message),
447 (unsigned long)init_packet,
448 VM_PKT_DATA_INBAND,
449 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
450 if (ret != 0) {
451 netdev_err(ndev,
452 "unable to send send buffer's gpadl to netvsp\n");
453 goto cleanup;
454 }
455
456 wait_for_completion(&net_device->channel_init_wait);
457
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);
465 ret = -EINVAL;
466 goto cleanup;
467 }
468
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);
475 ret = -EINVAL;
476 goto cleanup;
477 }
478
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;
481
482 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
483 net_device->send_section_size, net_device->send_section_cnt);
484
485 /* Setup state for managing the send buffer. */
486 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
487
488 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
489 if (net_device->send_section_map == NULL) {
490 ret = -ENOMEM;
491 goto cleanup;
492 }
493
494 goto exit;
495
496cleanup:
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);
501
502exit:
503 return ret;
504}
505
506/* Negotiate NVSP protocol version */
507static int negotiate_nvsp_ver(struct hv_device *device,
508 struct netvsc_device *net_device,
509 struct nvsp_message *init_packet,
510 u32 nvsp_ver)
511{
512 struct net_device *ndev = hv_get_drvdata(device);
513 int ret;
514
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);
520
521 /* Send the init request */
522 ret = vmbus_sendpacket(device->channel, init_packet,
523 sizeof(struct nvsp_message),
524 (unsigned long)init_packet,
525 VM_PKT_DATA_INBAND,
526 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
527
528 if (ret != 0)
529 return ret;
530
531 wait_for_completion(&net_device->channel_init_wait);
532
533 if (init_packet->msg.init_msg.init_complete.status !=
534 NVSP_STAT_SUCCESS)
535 return -EINVAL;
536
537 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
538 return 0;
539
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;
545
546 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
547 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
548
549 /* Teaming bit is needed to receive link speed updates */
550 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
551 }
552
553 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
554 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
555
556 trace_nvsp_send(ndev, init_packet);
557
558 ret = vmbus_sendpacket(device->channel, init_packet,
559 sizeof(struct nvsp_message),
560 (unsigned long)init_packet,
561 VM_PKT_DATA_INBAND, 0);
562
563 return ret;
564}
565
566static int netvsc_connect_vsp(struct hv_device *device,
567 struct netvsc_device *net_device,
568 const struct netvsc_device_info *device_info)
569{
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
575 };
576 struct nvsp_message *init_packet;
577 int ndis_version, i, ret;
578
579 init_packet = &net_device->channel_init_pkt;
580
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,
584 ver_list[i]) == 0) {
585 net_device->nvsp_version = ver_list[i];
586 break;
587 }
588
589 if (i < 0) {
590 ret = -EPROTO;
591 goto cleanup;
592 }
593
594 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
595
596 /* Send the ndis version */
597 memset(init_packet, 0, sizeof(struct nvsp_message));
598
599 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
600 ndis_version = 0x00060001;
601 else
602 ndis_version = 0x0006001e;
603
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;
611
612 trace_nvsp_send(ndev, init_packet);
613
614 /* Send the init request */
615 ret = vmbus_sendpacket(device->channel, init_packet,
616 sizeof(struct nvsp_message),
617 (unsigned long)init_packet,
618 VM_PKT_DATA_INBAND, 0);
619 if (ret != 0)
620 goto cleanup;
621
622
623 ret = netvsc_init_buf(device, net_device, device_info);
624
625cleanup:
626 return ret;
627}
628
629/*
630 * netvsc_device_remove - Callback when the root bus device is removed
631 */
632void netvsc_device_remove(struct hv_device *device)
633{
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);
638 int i;
639
640 /*
641 * Revoke receive buffer. If host is pre-Win2016 then tear down
642 * receive buffer GPADL. Do the same for send buffer.
643 */
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);
647
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);
651
652 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
653
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);
659 }
660
661 /*
662 * At this point, no one should be accessing net_device
663 * except in here
664 */
665 netdev_dbg(ndev, "net device safe to remove\n");
666
667 /* Now, we can close the channel safely */
668 vmbus_close(device->channel);
669
670 /*
671 * If host is Win2016 or higher then we do the GPADL tear down
672 * here after VMBus is closed.
673 */
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);
677 }
678
679 /* Release all resources */
680 free_netvsc_device_rcu(net_device);
681}
682
683#define RING_AVAIL_PERCENT_HIWATER 20
684#define RING_AVAIL_PERCENT_LOWATER 10
685
686static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
687 u32 index)
688{
689 sync_change_bit(index, net_device->send_section_map);
690}
691
692static 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,
696 int budget)
697{
698 struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
699 struct net_device_context *ndev_ctx = netdev_priv(ndev);
700 u16 q_idx = 0;
701 int queue_sends;
702
703 /* Notify the layer above us */
704 if (likely(skb)) {
705 const struct hv_netvsc_packet *packet
706 = (struct hv_netvsc_packet *)skb->cb;
707 u32 send_index = packet->send_buf_index;
708 struct netvsc_stats *tx_stats;
709
710 if (send_index != NETVSC_INVALID_INDEX)
711 netvsc_free_send_slot(net_device, send_index);
712 q_idx = packet->q_idx;
713
714 tx_stats = &net_device->chan_table[q_idx].tx_stats;
715
716 u64_stats_update_begin(&tx_stats->syncp);
717 tx_stats->packets += packet->total_packets;
718 tx_stats->bytes += packet->total_bytes;
719 u64_stats_update_end(&tx_stats->syncp);
720
721 napi_consume_skb(skb, budget);
722 }
723
724 queue_sends =
725 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
726
727 if (unlikely(net_device->destroy)) {
728 if (queue_sends == 0)
729 wake_up(&net_device->wait_drain);
730 } else {
731 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
732
733 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
734 (hv_get_avail_to_write_percent(&channel->outbound) >
735 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
736 netif_tx_wake_queue(txq);
737 ndev_ctx->eth_stats.wake_queue++;
738 }
739 }
740}
741
742static void netvsc_send_completion(struct net_device *ndev,
743 struct netvsc_device *net_device,
744 struct vmbus_channel *incoming_channel,
745 const struct vmpacket_descriptor *desc,
746 int budget)
747{
748 const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
749 u32 msglen = hv_pkt_datalen(desc);
750
751 /* Ensure packet is big enough to read header fields */
752 if (msglen < sizeof(struct nvsp_message_header)) {
753 netdev_err(ndev, "nvsp_message length too small: %u\n", msglen);
754 return;
755 }
756
757 switch (nvsp_packet->hdr.msg_type) {
758 case NVSP_MSG_TYPE_INIT_COMPLETE:
759 if (msglen < sizeof(struct nvsp_message_header) +
760 sizeof(struct nvsp_message_init_complete)) {
761 netdev_err(ndev, "nvsp_msg length too small: %u\n",
762 msglen);
763 return;
764 }
765 fallthrough;
766
767 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
768 if (msglen < sizeof(struct nvsp_message_header) +
769 sizeof(struct nvsp_1_message_send_receive_buffer_complete)) {
770 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
771 msglen);
772 return;
773 }
774 fallthrough;
775
776 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
777 if (msglen < sizeof(struct nvsp_message_header) +
778 sizeof(struct nvsp_1_message_send_send_buffer_complete)) {
779 netdev_err(ndev, "nvsp_msg1 length too small: %u\n",
780 msglen);
781 return;
782 }
783 fallthrough;
784
785 case NVSP_MSG5_TYPE_SUBCHANNEL:
786 if (msglen < sizeof(struct nvsp_message_header) +
787 sizeof(struct nvsp_5_subchannel_complete)) {
788 netdev_err(ndev, "nvsp_msg5 length too small: %u\n",
789 msglen);
790 return;
791 }
792 /* Copy the response back */
793 memcpy(&net_device->channel_init_pkt, nvsp_packet,
794 sizeof(struct nvsp_message));
795 complete(&net_device->channel_init_wait);
796 break;
797
798 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
799 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
800 desc, budget);
801 break;
802
803 default:
804 netdev_err(ndev,
805 "Unknown send completion type %d received!!\n",
806 nvsp_packet->hdr.msg_type);
807 }
808}
809
810static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
811{
812 unsigned long *map_addr = net_device->send_section_map;
813 unsigned int i;
814
815 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
816 if (sync_test_and_set_bit(i, map_addr) == 0)
817 return i;
818 }
819
820 return NETVSC_INVALID_INDEX;
821}
822
823static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
824 unsigned int section_index,
825 u32 pend_size,
826 struct hv_netvsc_packet *packet,
827 struct rndis_message *rndis_msg,
828 struct hv_page_buffer *pb,
829 bool xmit_more)
830{
831 char *start = net_device->send_buf;
832 char *dest = start + (section_index * net_device->send_section_size)
833 + pend_size;
834 int i;
835 u32 padding = 0;
836 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
837 packet->page_buf_cnt;
838 u32 remain;
839
840 /* Add padding */
841 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
842 if (xmit_more && remain) {
843 padding = net_device->pkt_align - remain;
844 rndis_msg->msg_len += padding;
845 packet->total_data_buflen += padding;
846 }
847
848 for (i = 0; i < page_count; i++) {
849 char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT);
850 u32 offset = pb[i].offset;
851 u32 len = pb[i].len;
852
853 memcpy(dest, (src + offset), len);
854 dest += len;
855 }
856
857 if (padding)
858 memset(dest, 0, padding);
859}
860
861static inline int netvsc_send_pkt(
862 struct hv_device *device,
863 struct hv_netvsc_packet *packet,
864 struct netvsc_device *net_device,
865 struct hv_page_buffer *pb,
866 struct sk_buff *skb)
867{
868 struct nvsp_message nvmsg;
869 struct nvsp_1_message_send_rndis_packet *rpkt =
870 &nvmsg.msg.v1_msg.send_rndis_pkt;
871 struct netvsc_channel * const nvchan =
872 &net_device->chan_table[packet->q_idx];
873 struct vmbus_channel *out_channel = nvchan->channel;
874 struct net_device *ndev = hv_get_drvdata(device);
875 struct net_device_context *ndev_ctx = netdev_priv(ndev);
876 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
877 u64 req_id;
878 int ret;
879 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
880
881 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
882 if (skb)
883 rpkt->channel_type = 0; /* 0 is RMC_DATA */
884 else
885 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
886
887 rpkt->send_buf_section_index = packet->send_buf_index;
888 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
889 rpkt->send_buf_section_size = 0;
890 else
891 rpkt->send_buf_section_size = packet->total_data_buflen;
892
893 req_id = (ulong)skb;
894
895 if (out_channel->rescind)
896 return -ENODEV;
897
898 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
899
900 if (packet->page_buf_cnt) {
901 if (packet->cp_partial)
902 pb += packet->rmsg_pgcnt;
903
904 ret = vmbus_sendpacket_pagebuffer(out_channel,
905 pb, packet->page_buf_cnt,
906 &nvmsg, sizeof(nvmsg),
907 req_id);
908 } else {
909 ret = vmbus_sendpacket(out_channel,
910 &nvmsg, sizeof(nvmsg),
911 req_id, VM_PKT_DATA_INBAND,
912 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
913 }
914
915 if (ret == 0) {
916 atomic_inc_return(&nvchan->queue_sends);
917
918 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
919 netif_tx_stop_queue(txq);
920 ndev_ctx->eth_stats.stop_queue++;
921 }
922 } else if (ret == -EAGAIN) {
923 netif_tx_stop_queue(txq);
924 ndev_ctx->eth_stats.stop_queue++;
925 } else {
926 netdev_err(ndev,
927 "Unable to send packet pages %u len %u, ret %d\n",
928 packet->page_buf_cnt, packet->total_data_buflen,
929 ret);
930 }
931
932 if (netif_tx_queue_stopped(txq) &&
933 atomic_read(&nvchan->queue_sends) < 1 &&
934 !net_device->tx_disable) {
935 netif_tx_wake_queue(txq);
936 ndev_ctx->eth_stats.wake_queue++;
937 if (ret == -EAGAIN)
938 ret = -ENOSPC;
939 }
940
941 return ret;
942}
943
944/* Move packet out of multi send data (msd), and clear msd */
945static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
946 struct sk_buff **msd_skb,
947 struct multi_send_data *msdp)
948{
949 *msd_skb = msdp->skb;
950 *msd_send = msdp->pkt;
951 msdp->skb = NULL;
952 msdp->pkt = NULL;
953 msdp->count = 0;
954}
955
956/* RCU already held by caller */
957int netvsc_send(struct net_device *ndev,
958 struct hv_netvsc_packet *packet,
959 struct rndis_message *rndis_msg,
960 struct hv_page_buffer *pb,
961 struct sk_buff *skb,
962 bool xdp_tx)
963{
964 struct net_device_context *ndev_ctx = netdev_priv(ndev);
965 struct netvsc_device *net_device
966 = rcu_dereference_bh(ndev_ctx->nvdev);
967 struct hv_device *device = ndev_ctx->device_ctx;
968 int ret = 0;
969 struct netvsc_channel *nvchan;
970 u32 pktlen = packet->total_data_buflen, msd_len = 0;
971 unsigned int section_index = NETVSC_INVALID_INDEX;
972 struct multi_send_data *msdp;
973 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
974 struct sk_buff *msd_skb = NULL;
975 bool try_batch, xmit_more;
976
977 /* If device is rescinded, return error and packet will get dropped. */
978 if (unlikely(!net_device || net_device->destroy))
979 return -ENODEV;
980
981 nvchan = &net_device->chan_table[packet->q_idx];
982 packet->send_buf_index = NETVSC_INVALID_INDEX;
983 packet->cp_partial = false;
984
985 /* Send a control message or XDP packet directly without accessing
986 * msd (Multi-Send Data) field which may be changed during data packet
987 * processing.
988 */
989 if (!skb || xdp_tx)
990 return netvsc_send_pkt(device, packet, net_device, pb, skb);
991
992 /* batch packets in send buffer if possible */
993 msdp = &nvchan->msd;
994 if (msdp->pkt)
995 msd_len = msdp->pkt->total_data_buflen;
996
997 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
998 if (try_batch && msd_len + pktlen + net_device->pkt_align <
999 net_device->send_section_size) {
1000 section_index = msdp->pkt->send_buf_index;
1001
1002 } else if (try_batch && msd_len + packet->rmsg_size <
1003 net_device->send_section_size) {
1004 section_index = msdp->pkt->send_buf_index;
1005 packet->cp_partial = true;
1006
1007 } else if (pktlen + net_device->pkt_align <
1008 net_device->send_section_size) {
1009 section_index = netvsc_get_next_send_section(net_device);
1010 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
1011 ++ndev_ctx->eth_stats.tx_send_full;
1012 } else {
1013 move_pkt_msd(&msd_send, &msd_skb, msdp);
1014 msd_len = 0;
1015 }
1016 }
1017
1018 /* Keep aggregating only if stack says more data is coming
1019 * and not doing mixed modes send and not flow blocked
1020 */
1021 xmit_more = netdev_xmit_more() &&
1022 !packet->cp_partial &&
1023 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
1024
1025 if (section_index != NETVSC_INVALID_INDEX) {
1026 netvsc_copy_to_send_buf(net_device,
1027 section_index, msd_len,
1028 packet, rndis_msg, pb, xmit_more);
1029
1030 packet->send_buf_index = section_index;
1031
1032 if (packet->cp_partial) {
1033 packet->page_buf_cnt -= packet->rmsg_pgcnt;
1034 packet->total_data_buflen = msd_len + packet->rmsg_size;
1035 } else {
1036 packet->page_buf_cnt = 0;
1037 packet->total_data_buflen += msd_len;
1038 }
1039
1040 if (msdp->pkt) {
1041 packet->total_packets += msdp->pkt->total_packets;
1042 packet->total_bytes += msdp->pkt->total_bytes;
1043 }
1044
1045 if (msdp->skb)
1046 dev_consume_skb_any(msdp->skb);
1047
1048 if (xmit_more) {
1049 msdp->skb = skb;
1050 msdp->pkt = packet;
1051 msdp->count++;
1052 } else {
1053 cur_send = packet;
1054 msdp->skb = NULL;
1055 msdp->pkt = NULL;
1056 msdp->count = 0;
1057 }
1058 } else {
1059 move_pkt_msd(&msd_send, &msd_skb, msdp);
1060 cur_send = packet;
1061 }
1062
1063 if (msd_send) {
1064 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1065 NULL, msd_skb);
1066
1067 if (m_ret != 0) {
1068 netvsc_free_send_slot(net_device,
1069 msd_send->send_buf_index);
1070 dev_kfree_skb_any(msd_skb);
1071 }
1072 }
1073
1074 if (cur_send)
1075 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1076
1077 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1078 netvsc_free_send_slot(net_device, section_index);
1079
1080 return ret;
1081}
1082
1083/* Send pending recv completions */
1084static int send_recv_completions(struct net_device *ndev,
1085 struct netvsc_device *nvdev,
1086 struct netvsc_channel *nvchan)
1087{
1088 struct multi_recv_comp *mrc = &nvchan->mrc;
1089 struct recv_comp_msg {
1090 struct nvsp_message_header hdr;
1091 u32 status;
1092 } __packed;
1093 struct recv_comp_msg msg = {
1094 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1095 };
1096 int ret;
1097
1098 while (mrc->first != mrc->next) {
1099 const struct recv_comp_data *rcd
1100 = mrc->slots + mrc->first;
1101
1102 msg.status = rcd->status;
1103 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1104 rcd->tid, VM_PKT_COMP, 0);
1105 if (unlikely(ret)) {
1106 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1107
1108 ++ndev_ctx->eth_stats.rx_comp_busy;
1109 return ret;
1110 }
1111
1112 if (++mrc->first == nvdev->recv_completion_cnt)
1113 mrc->first = 0;
1114 }
1115
1116 /* receive completion ring has been emptied */
1117 if (unlikely(nvdev->destroy))
1118 wake_up(&nvdev->wait_drain);
1119
1120 return 0;
1121}
1122
1123/* Count how many receive completions are outstanding */
1124static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1125 const struct multi_recv_comp *mrc,
1126 u32 *filled, u32 *avail)
1127{
1128 u32 count = nvdev->recv_completion_cnt;
1129
1130 if (mrc->next >= mrc->first)
1131 *filled = mrc->next - mrc->first;
1132 else
1133 *filled = (count - mrc->first) + mrc->next;
1134
1135 *avail = count - *filled - 1;
1136}
1137
1138/* Add receive complete to ring to send to host. */
1139static void enq_receive_complete(struct net_device *ndev,
1140 struct netvsc_device *nvdev, u16 q_idx,
1141 u64 tid, u32 status)
1142{
1143 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1144 struct multi_recv_comp *mrc = &nvchan->mrc;
1145 struct recv_comp_data *rcd;
1146 u32 filled, avail;
1147
1148 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1149
1150 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1151 send_recv_completions(ndev, nvdev, nvchan);
1152 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1153 }
1154
1155 if (unlikely(!avail)) {
1156 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1157 q_idx, tid);
1158 return;
1159 }
1160
1161 rcd = mrc->slots + mrc->next;
1162 rcd->tid = tid;
1163 rcd->status = status;
1164
1165 if (++mrc->next == nvdev->recv_completion_cnt)
1166 mrc->next = 0;
1167}
1168
1169static int netvsc_receive(struct net_device *ndev,
1170 struct netvsc_device *net_device,
1171 struct netvsc_channel *nvchan,
1172 const struct vmpacket_descriptor *desc)
1173{
1174 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1175 struct vmbus_channel *channel = nvchan->channel;
1176 const struct vmtransfer_page_packet_header *vmxferpage_packet
1177 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1178 const struct nvsp_message *nvsp = hv_pkt_data(desc);
1179 u32 msglen = hv_pkt_datalen(desc);
1180 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1181 char *recv_buf = net_device->recv_buf;
1182 u32 status = NVSP_STAT_SUCCESS;
1183 int i;
1184 int count = 0;
1185
1186 /* Ensure packet is big enough to read header fields */
1187 if (msglen < sizeof(struct nvsp_message_header)) {
1188 netif_err(net_device_ctx, rx_err, ndev,
1189 "invalid nvsp header, length too small: %u\n",
1190 msglen);
1191 return 0;
1192 }
1193
1194 /* Make sure this is a valid nvsp packet */
1195 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1196 netif_err(net_device_ctx, rx_err, ndev,
1197 "Unknown nvsp packet type received %u\n",
1198 nvsp->hdr.msg_type);
1199 return 0;
1200 }
1201
1202 /* Validate xfer page pkt header */
1203 if ((desc->offset8 << 3) < sizeof(struct vmtransfer_page_packet_header)) {
1204 netif_err(net_device_ctx, rx_err, ndev,
1205 "Invalid xfer page pkt, offset too small: %u\n",
1206 desc->offset8 << 3);
1207 return 0;
1208 }
1209
1210 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1211 netif_err(net_device_ctx, rx_err, ndev,
1212 "Invalid xfer page set id - expecting %x got %x\n",
1213 NETVSC_RECEIVE_BUFFER_ID,
1214 vmxferpage_packet->xfer_pageset_id);
1215 return 0;
1216 }
1217
1218 count = vmxferpage_packet->range_cnt;
1219
1220 /* Check count for a valid value */
1221 if (NETVSC_XFER_HEADER_SIZE(count) > desc->offset8 << 3) {
1222 netif_err(net_device_ctx, rx_err, ndev,
1223 "Range count is not valid: %d\n",
1224 count);
1225 return 0;
1226 }
1227
1228 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1229 for (i = 0; i < count; i++) {
1230 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1231 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1232 void *data;
1233 int ret;
1234
1235 if (unlikely(offset > net_device->recv_buf_size ||
1236 buflen > net_device->recv_buf_size - offset)) {
1237 nvchan->rsc.cnt = 0;
1238 status = NVSP_STAT_FAIL;
1239 netif_err(net_device_ctx, rx_err, ndev,
1240 "Packet offset:%u + len:%u too big\n",
1241 offset, buflen);
1242
1243 continue;
1244 }
1245
1246 data = recv_buf + offset;
1247
1248 nvchan->rsc.is_last = (i == count - 1);
1249
1250 trace_rndis_recv(ndev, q_idx, data);
1251
1252 /* Pass it to the upper layer */
1253 ret = rndis_filter_receive(ndev, net_device,
1254 nvchan, data, buflen);
1255
1256 if (unlikely(ret != NVSP_STAT_SUCCESS))
1257 status = NVSP_STAT_FAIL;
1258 }
1259
1260 enq_receive_complete(ndev, net_device, q_idx,
1261 vmxferpage_packet->d.trans_id, status);
1262
1263 return count;
1264}
1265
1266static void netvsc_send_table(struct net_device *ndev,
1267 struct netvsc_device *nvscdev,
1268 const struct nvsp_message *nvmsg,
1269 u32 msglen)
1270{
1271 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1272 u32 count, offset, *tab;
1273 int i;
1274
1275 /* Ensure packet is big enough to read send_table fields */
1276 if (msglen < sizeof(struct nvsp_message_header) +
1277 sizeof(struct nvsp_5_send_indirect_table)) {
1278 netdev_err(ndev, "nvsp_v5_msg length too small: %u\n", msglen);
1279 return;
1280 }
1281
1282 count = nvmsg->msg.v5_msg.send_table.count;
1283 offset = nvmsg->msg.v5_msg.send_table.offset;
1284
1285 if (count != VRSS_SEND_TAB_SIZE) {
1286 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1287 return;
1288 }
1289
1290 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1291 * wrong due to a host bug. So fix the offset here.
1292 */
1293 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1294 msglen >= sizeof(struct nvsp_message_header) +
1295 sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1296 offset = sizeof(struct nvsp_message_header) +
1297 sizeof(union nvsp_6_message_uber);
1298
1299 /* Boundary check for all versions */
1300 if (offset > msglen - count * sizeof(u32)) {
1301 netdev_err(ndev, "Received send-table offset too big:%u\n",
1302 offset);
1303 return;
1304 }
1305
1306 tab = (void *)nvmsg + offset;
1307
1308 for (i = 0; i < count; i++)
1309 net_device_ctx->tx_table[i] = tab[i];
1310}
1311
1312static void netvsc_send_vf(struct net_device *ndev,
1313 const struct nvsp_message *nvmsg,
1314 u32 msglen)
1315{
1316 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1317
1318 /* Ensure packet is big enough to read its fields */
1319 if (msglen < sizeof(struct nvsp_message_header) +
1320 sizeof(struct nvsp_4_send_vf_association)) {
1321 netdev_err(ndev, "nvsp_v4_msg length too small: %u\n", msglen);
1322 return;
1323 }
1324
1325 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1326 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1327 netdev_info(ndev, "VF slot %u %s\n",
1328 net_device_ctx->vf_serial,
1329 net_device_ctx->vf_alloc ? "added" : "removed");
1330}
1331
1332static void netvsc_receive_inband(struct net_device *ndev,
1333 struct netvsc_device *nvscdev,
1334 const struct vmpacket_descriptor *desc)
1335{
1336 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1337 u32 msglen = hv_pkt_datalen(desc);
1338
1339 /* Ensure packet is big enough to read header fields */
1340 if (msglen < sizeof(struct nvsp_message_header)) {
1341 netdev_err(ndev, "inband nvsp_message length too small: %u\n", msglen);
1342 return;
1343 }
1344
1345 switch (nvmsg->hdr.msg_type) {
1346 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1347 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1348 break;
1349
1350 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1351 netvsc_send_vf(ndev, nvmsg, msglen);
1352 break;
1353 }
1354}
1355
1356static int netvsc_process_raw_pkt(struct hv_device *device,
1357 struct netvsc_channel *nvchan,
1358 struct netvsc_device *net_device,
1359 struct net_device *ndev,
1360 const struct vmpacket_descriptor *desc,
1361 int budget)
1362{
1363 struct vmbus_channel *channel = nvchan->channel;
1364 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1365
1366 trace_nvsp_recv(ndev, channel, nvmsg);
1367
1368 switch (desc->type) {
1369 case VM_PKT_COMP:
1370 netvsc_send_completion(ndev, net_device, channel, desc, budget);
1371 break;
1372
1373 case VM_PKT_DATA_USING_XFER_PAGES:
1374 return netvsc_receive(ndev, net_device, nvchan, desc);
1375 break;
1376
1377 case VM_PKT_DATA_INBAND:
1378 netvsc_receive_inband(ndev, net_device, desc);
1379 break;
1380
1381 default:
1382 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1383 desc->type, desc->trans_id);
1384 break;
1385 }
1386
1387 return 0;
1388}
1389
1390static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1391{
1392 struct vmbus_channel *primary = channel->primary_channel;
1393
1394 return primary ? primary->device_obj : channel->device_obj;
1395}
1396
1397/* Network processing softirq
1398 * Process data in incoming ring buffer from host
1399 * Stops when ring is empty or budget is met or exceeded.
1400 */
1401int netvsc_poll(struct napi_struct *napi, int budget)
1402{
1403 struct netvsc_channel *nvchan
1404 = container_of(napi, struct netvsc_channel, napi);
1405 struct netvsc_device *net_device = nvchan->net_device;
1406 struct vmbus_channel *channel = nvchan->channel;
1407 struct hv_device *device = netvsc_channel_to_device(channel);
1408 struct net_device *ndev = hv_get_drvdata(device);
1409 int work_done = 0;
1410 int ret;
1411
1412 /* If starting a new interval */
1413 if (!nvchan->desc)
1414 nvchan->desc = hv_pkt_iter_first(channel);
1415
1416 while (nvchan->desc && work_done < budget) {
1417 work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1418 ndev, nvchan->desc, budget);
1419 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1420 }
1421
1422 /* Send any pending receive completions */
1423 ret = send_recv_completions(ndev, net_device, nvchan);
1424
1425 /* If it did not exhaust NAPI budget this time
1426 * and not doing busy poll
1427 * then re-enable host interrupts
1428 * and reschedule if ring is not empty
1429 * or sending receive completion failed.
1430 */
1431 if (work_done < budget &&
1432 napi_complete_done(napi, work_done) &&
1433 (ret || hv_end_read(&channel->inbound)) &&
1434 napi_schedule_prep(napi)) {
1435 hv_begin_read(&channel->inbound);
1436 __napi_schedule(napi);
1437 }
1438
1439 /* Driver may overshoot since multiple packets per descriptor */
1440 return min(work_done, budget);
1441}
1442
1443/* Call back when data is available in host ring buffer.
1444 * Processing is deferred until network softirq (NAPI)
1445 */
1446void netvsc_channel_cb(void *context)
1447{
1448 struct netvsc_channel *nvchan = context;
1449 struct vmbus_channel *channel = nvchan->channel;
1450 struct hv_ring_buffer_info *rbi = &channel->inbound;
1451
1452 /* preload first vmpacket descriptor */
1453 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1454
1455 if (napi_schedule_prep(&nvchan->napi)) {
1456 /* disable interrupts from host */
1457 hv_begin_read(rbi);
1458
1459 __napi_schedule_irqoff(&nvchan->napi);
1460 }
1461}
1462
1463/*
1464 * netvsc_device_add - Callback when the device belonging to this
1465 * driver is added
1466 */
1467struct netvsc_device *netvsc_device_add(struct hv_device *device,
1468 const struct netvsc_device_info *device_info)
1469{
1470 int i, ret = 0;
1471 struct netvsc_device *net_device;
1472 struct net_device *ndev = hv_get_drvdata(device);
1473 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1474
1475 net_device = alloc_net_device();
1476 if (!net_device)
1477 return ERR_PTR(-ENOMEM);
1478
1479 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1480 net_device_ctx->tx_table[i] = 0;
1481
1482 /* Because the device uses NAPI, all the interrupt batching and
1483 * control is done via Net softirq, not the channel handling
1484 */
1485 set_channel_read_mode(device->channel, HV_CALL_ISR);
1486
1487 /* If we're reopening the device we may have multiple queues, fill the
1488 * chn_table with the default channel to use it before subchannels are
1489 * opened.
1490 * Initialize the channel state before we open;
1491 * we can be interrupted as soon as we open the channel.
1492 */
1493
1494 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1495 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1496
1497 nvchan->channel = device->channel;
1498 nvchan->net_device = net_device;
1499 u64_stats_init(&nvchan->tx_stats.syncp);
1500 u64_stats_init(&nvchan->rx_stats.syncp);
1501
1502 ret = xdp_rxq_info_reg(&nvchan->xdp_rxq, ndev, i);
1503
1504 if (ret) {
1505 netdev_err(ndev, "xdp_rxq_info_reg fail: %d\n", ret);
1506 goto cleanup2;
1507 }
1508
1509 ret = xdp_rxq_info_reg_mem_model(&nvchan->xdp_rxq,
1510 MEM_TYPE_PAGE_SHARED, NULL);
1511
1512 if (ret) {
1513 netdev_err(ndev, "xdp reg_mem_model fail: %d\n", ret);
1514 goto cleanup2;
1515 }
1516 }
1517
1518 /* Enable NAPI handler before init callbacks */
1519 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1520 netvsc_poll, NAPI_POLL_WEIGHT);
1521
1522 /* Open the channel */
1523 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1524 netvsc_ring_bytes, NULL, 0,
1525 netvsc_channel_cb, net_device->chan_table);
1526
1527 if (ret != 0) {
1528 netdev_err(ndev, "unable to open channel: %d\n", ret);
1529 goto cleanup;
1530 }
1531
1532 /* Channel is opened */
1533 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1534
1535 napi_enable(&net_device->chan_table[0].napi);
1536
1537 /* Connect with the NetVsp */
1538 ret = netvsc_connect_vsp(device, net_device, device_info);
1539 if (ret != 0) {
1540 netdev_err(ndev,
1541 "unable to connect to NetVSP - %d\n", ret);
1542 goto close;
1543 }
1544
1545 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1546 * populated.
1547 */
1548 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1549
1550 return net_device;
1551
1552close:
1553 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1554 napi_disable(&net_device->chan_table[0].napi);
1555
1556 /* Now, we can close the channel safely */
1557 vmbus_close(device->channel);
1558
1559cleanup:
1560 netif_napi_del(&net_device->chan_table[0].napi);
1561
1562cleanup2:
1563 free_netvsc_device(&net_device->rcu);
1564
1565 return ERR_PTR(ret);
1566}