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166 /* If the failure is because the channel is rescinded;
167 * ignore the failure since we cannot send on a rescinded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169 * even when the channel is rescinded.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