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Linux 4.19.133
[linux/fpc-iii.git] / drivers / net / hyperv / netvsc.c
blob77a9a753d9794ca6ee8c79079f0db6b3d7f5737d
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authors:
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
19 */
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/wait.h>
25 #include <linux/mm.h>
26 #include <linux/delay.h>
27 #include <linux/io.h>
28 #include <linux/slab.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/vmalloc.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/prefetch.h>
34
35 #include <asm/sync_bitops.h>
36
37 #include "hyperv_net.h"
38 #include "netvsc_trace.h"
39
40 /*
41 * Switch the data path from the synthetic interface to the VF
42 * interface.
43 */
44 void netvsc_switch_datapath(struct net_device *ndev, bool vf)
45 {
46 struct net_device_context *net_device_ctx = netdev_priv(ndev);
47 struct hv_device *dev = net_device_ctx->device_ctx;
48 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
49 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
50
51 memset(init_pkt, 0, sizeof(struct nvsp_message));
52 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
53 if (vf)
54 init_pkt->msg.v4_msg.active_dp.active_datapath =
55 NVSP_DATAPATH_VF;
56 else
57 init_pkt->msg.v4_msg.active_dp.active_datapath =
58 NVSP_DATAPATH_SYNTHETIC;
59
60 trace_nvsp_send(ndev, init_pkt);
61
62 vmbus_sendpacket(dev->channel, init_pkt,
63 sizeof(struct nvsp_message),
64 (unsigned long)init_pkt,
65 VM_PKT_DATA_INBAND, 0);
66 }
67
68 /* Worker to setup sub channels on initial setup
69 * Initial hotplug event occurs in softirq context
70 * and can't wait for channels.
71 */
72 static void netvsc_subchan_work(struct work_struct *w)
73 {
74 struct netvsc_device *nvdev =
75 container_of(w, struct netvsc_device, subchan_work);
76 struct rndis_device *rdev;
77 int i, ret;
78
79 /* Avoid deadlock with device removal already under RTNL */
80 if (!rtnl_trylock()) {
81 schedule_work(w);
82 return;
83 }
84
85 rdev = nvdev->extension;
86 if (rdev) {
87 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
88 if (ret == 0) {
89 netif_device_attach(rdev->ndev);
90 } else {
91 /* fallback to only primary channel */
92 for (i = 1; i < nvdev->num_chn; i++)
93 netif_napi_del(&nvdev->chan_table[i].napi);
94
95 nvdev->max_chn = 1;
96 nvdev->num_chn = 1;
97 }
98 }
99
100 rtnl_unlock();
101 }
102
103 static struct netvsc_device *alloc_net_device(void)
104 {
105 struct netvsc_device *net_device;
106
107 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
108 if (!net_device)
109 return NULL;
110
111 init_waitqueue_head(&net_device->wait_drain);
112 net_device->destroy = false;
113 net_device->tx_disable = true;
114
115 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
116 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
117
118 init_completion(&net_device->channel_init_wait);
119 init_waitqueue_head(&net_device->subchan_open);
120 INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
121
122 return net_device;
123 }
124
125 static void free_netvsc_device(struct rcu_head *head)
126 {
127 struct netvsc_device *nvdev
128 = container_of(head, struct netvsc_device, rcu);
129 int i;
130
131 kfree(nvdev->extension);
132 vfree(nvdev->recv_buf);
133 vfree(nvdev->send_buf);
134 kfree(nvdev->send_section_map);
135
136 for (i = 0; i < VRSS_CHANNEL_MAX; i++)
137 vfree(nvdev->chan_table[i].mrc.slots);
138
139 kfree(nvdev);
140 }
141
142 static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
143 {
144 call_rcu(&nvdev->rcu, free_netvsc_device);
145 }
146
147 static void netvsc_revoke_recv_buf(struct hv_device *device,
148 struct netvsc_device *net_device,
149 struct net_device *ndev)
150 {
151 struct nvsp_message *revoke_packet;
152 int ret;
153
154 /*
155 * If we got a section count, it means we received a
156 * SendReceiveBufferComplete msg (ie sent
157 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
158 * to send a revoke msg here
159 */
160 if (net_device->recv_section_cnt) {
161 /* Send the revoke receive buffer */
162 revoke_packet = &net_device->revoke_packet;
163 memset(revoke_packet, 0, sizeof(struct nvsp_message));
164
165 revoke_packet->hdr.msg_type =
166 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
167 revoke_packet->msg.v1_msg.
168 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
169
170 trace_nvsp_send(ndev, revoke_packet);
171
172 ret = vmbus_sendpacket(device->channel,
173 revoke_packet,
174 sizeof(struct nvsp_message),
175 (unsigned long)revoke_packet,
176 VM_PKT_DATA_INBAND, 0);
177 /* If the failure is because the channel is rescinded;
178 * ignore the failure since we cannot send on a rescinded
179 * channel. This would allow us to properly cleanup
180 * even when the channel is rescinded.
181 */
182 if (device->channel->rescind)
183 ret = 0;
184 /*
185 * If we failed here, we might as well return and
186 * have a leak rather than continue and a bugchk
187 */
188 if (ret != 0) {
189 netdev_err(ndev, "unable to send "
190 "revoke receive buffer to netvsp\n");
191 return;
192 }
193 net_device->recv_section_cnt = 0;
194 }
195 }
196
197 static void netvsc_revoke_send_buf(struct hv_device *device,
198 struct netvsc_device *net_device,
199 struct net_device *ndev)
200 {
201 struct nvsp_message *revoke_packet;
202 int ret;
203
204 /* Deal with the send buffer we may have setup.
205 * If we got a send section size, it means we received a
206 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
207 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
208 * to send a revoke msg here
209 */
210 if (net_device->send_section_cnt) {
211 /* Send the revoke receive buffer */
212 revoke_packet = &net_device->revoke_packet;
213 memset(revoke_packet, 0, sizeof(struct nvsp_message));
214
215 revoke_packet->hdr.msg_type =
216 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
217 revoke_packet->msg.v1_msg.revoke_send_buf.id =
218 NETVSC_SEND_BUFFER_ID;
219
220 trace_nvsp_send(ndev, revoke_packet);
221
222 ret = vmbus_sendpacket(device->channel,
223 revoke_packet,
224 sizeof(struct nvsp_message),
225 (unsigned long)revoke_packet,
226 VM_PKT_DATA_INBAND, 0);
227
228 /* If the failure is because the channel is rescinded;
229 * ignore the failure since we cannot send on a rescinded
230 * channel. This would allow us to properly cleanup
231 * even when the channel is rescinded.
232 */
233 if (device->channel->rescind)
234 ret = 0;
235
236 /* If we failed here, we might as well return and
237 * have a leak rather than continue and a bugchk
238 */
239 if (ret != 0) {
240 netdev_err(ndev, "unable to send "
241 "revoke send buffer to netvsp\n");
242 return;
243 }
244 net_device->send_section_cnt = 0;
245 }
246 }
247
248 static void netvsc_teardown_recv_gpadl(struct hv_device *device,
249 struct netvsc_device *net_device,
250 struct net_device *ndev)
251 {
252 int ret;
253
254 if (net_device->recv_buf_gpadl_handle) {
255 ret = vmbus_teardown_gpadl(device->channel,
256 net_device->recv_buf_gpadl_handle);
257
258 /* If we failed here, we might as well return and have a leak
259 * rather than continue and a bugchk
260 */
261 if (ret != 0) {
262 netdev_err(ndev,
263 "unable to teardown receive buffer's gpadl\n");
264 return;
265 }
266 net_device->recv_buf_gpadl_handle = 0;
267 }
268 }
269
270 static void netvsc_teardown_send_gpadl(struct hv_device *device,
271 struct netvsc_device *net_device,
272 struct net_device *ndev)
273 {
274 int ret;
275
276 if (net_device->send_buf_gpadl_handle) {
277 ret = vmbus_teardown_gpadl(device->channel,
278 net_device->send_buf_gpadl_handle);
279
280 /* If we failed here, we might as well return and have a leak
281 * rather than continue and a bugchk
282 */
283 if (ret != 0) {
284 netdev_err(ndev,
285 "unable to teardown send buffer's gpadl\n");
286 return;
287 }
288 net_device->send_buf_gpadl_handle = 0;
289 }
290 }
291
292 int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
293 {
294 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
295 int node = cpu_to_node(nvchan->channel->target_cpu);
296 size_t size;
297
298 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
299 nvchan->mrc.slots = vzalloc_node(size, node);
300 if (!nvchan->mrc.slots)
301 nvchan->mrc.slots = vzalloc(size);
302
303 return nvchan->mrc.slots ? 0 : -ENOMEM;
304 }
305
306 static int netvsc_init_buf(struct hv_device *device,
307 struct netvsc_device *net_device,
308 const struct netvsc_device_info *device_info)
309 {
310 struct nvsp_1_message_send_receive_buffer_complete *resp;
311 struct net_device *ndev = hv_get_drvdata(device);
312 struct nvsp_message *init_packet;
313 unsigned int buf_size;
314 size_t map_words;
315 int ret = 0;
316
317 /* Get receive buffer area. */
318 buf_size = device_info->recv_sections * device_info->recv_section_size;
319 buf_size = roundup(buf_size, PAGE_SIZE);
320
321 /* Legacy hosts only allow smaller receive buffer */
322 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
323 buf_size = min_t(unsigned int, buf_size,
324 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
325
326 net_device->recv_buf = vzalloc(buf_size);
327 if (!net_device->recv_buf) {
328 netdev_err(ndev,
329 "unable to allocate receive buffer of size %u\n",
330 buf_size);
331 ret = -ENOMEM;
332 goto cleanup;
333 }
334
335 net_device->recv_buf_size = buf_size;
336
337 /*
338 * Establish the gpadl handle for this buffer on this
339 * channel. Note: This call uses the vmbus connection rather
340 * than the channel to establish the gpadl handle.
341 */
342 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
343 buf_size,
344 &net_device->recv_buf_gpadl_handle);
345 if (ret != 0) {
346 netdev_err(ndev,
347 "unable to establish receive buffer's gpadl\n");
348 goto cleanup;
349 }
350
351 /* Notify the NetVsp of the gpadl handle */
352 init_packet = &net_device->channel_init_pkt;
353 memset(init_packet, 0, sizeof(struct nvsp_message));
354 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
355 init_packet->msg.v1_msg.send_recv_buf.
356 gpadl_handle = net_device->recv_buf_gpadl_handle;
357 init_packet->msg.v1_msg.
358 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
359
360 trace_nvsp_send(ndev, init_packet);
361
362 /* Send the gpadl notification request */
363 ret = vmbus_sendpacket(device->channel, init_packet,
364 sizeof(struct nvsp_message),
365 (unsigned long)init_packet,
366 VM_PKT_DATA_INBAND,
367 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
368 if (ret != 0) {
369 netdev_err(ndev,
370 "unable to send receive buffer's gpadl to netvsp\n");
371 goto cleanup;
372 }
373
374 wait_for_completion(&net_device->channel_init_wait);
375
376 /* Check the response */
377 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
378 if (resp->status != NVSP_STAT_SUCCESS) {
379 netdev_err(ndev,
380 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
381 resp->status);
382 ret = -EINVAL;
383 goto cleanup;
384 }
385
386 /* Parse the response */
387 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
388 resp->num_sections, resp->sections[0].sub_alloc_size,
389 resp->sections[0].num_sub_allocs);
390
391 /* There should only be one section for the entire receive buffer */
392 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
393 ret = -EINVAL;
394 goto cleanup;
395 }
396
397 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
398 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
399
400 /* Setup receive completion ring */
401 net_device->recv_completion_cnt
402 = round_up(net_device->recv_section_cnt + 1,
403 PAGE_SIZE / sizeof(u64));
404 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
405 if (ret)
406 goto cleanup;
407
408 /* Now setup the send buffer. */
409 buf_size = device_info->send_sections * device_info->send_section_size;
410 buf_size = round_up(buf_size, PAGE_SIZE);
411
412 net_device->send_buf = vzalloc(buf_size);
413 if (!net_device->send_buf) {
414 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
415 buf_size);
416 ret = -ENOMEM;
417 goto cleanup;
418 }
419
420 /* Establish the gpadl handle for this buffer on this
421 * channel. Note: This call uses the vmbus connection rather
422 * than the channel to establish the gpadl handle.
423 */
424 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
425 buf_size,
426 &net_device->send_buf_gpadl_handle);
427 if (ret != 0) {
428 netdev_err(ndev,
429 "unable to establish send buffer's gpadl\n");
430 goto cleanup;
431 }
432
433 /* Notify the NetVsp of the gpadl handle */
434 init_packet = &net_device->channel_init_pkt;
435 memset(init_packet, 0, sizeof(struct nvsp_message));
436 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
437 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
438 net_device->send_buf_gpadl_handle;
439 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
440
441 trace_nvsp_send(ndev, init_packet);
442
443 /* Send the gpadl notification request */
444 ret = vmbus_sendpacket(device->channel, init_packet,
445 sizeof(struct nvsp_message),
446 (unsigned long)init_packet,
447 VM_PKT_DATA_INBAND,
448 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
449 if (ret != 0) {
450 netdev_err(ndev,
451 "unable to send send buffer's gpadl to netvsp\n");
452 goto cleanup;
453 }
454
455 wait_for_completion(&net_device->channel_init_wait);
456
457 /* Check the response */
458 if (init_packet->msg.v1_msg.
459 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
460 netdev_err(ndev, "Unable to complete send buffer "
461 "initialization with NetVsp - status %d\n",
462 init_packet->msg.v1_msg.
463 send_send_buf_complete.status);
464 ret = -EINVAL;
465 goto cleanup;
466 }
467
468 /* Parse the response */
469 net_device->send_section_size = init_packet->msg.
470 v1_msg.send_send_buf_complete.section_size;
471
472 /* Section count is simply the size divided by the section size. */
473 net_device->send_section_cnt = buf_size / net_device->send_section_size;
474
475 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
476 net_device->send_section_size, net_device->send_section_cnt);
477
478 /* Setup state for managing the send buffer. */
479 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
480
481 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
482 if (net_device->send_section_map == NULL) {
483 ret = -ENOMEM;
484 goto cleanup;
485 }
486
487 goto exit;
488
489 cleanup:
490 netvsc_revoke_recv_buf(device, net_device, ndev);
491 netvsc_revoke_send_buf(device, net_device, ndev);
492 netvsc_teardown_recv_gpadl(device, net_device, ndev);
493 netvsc_teardown_send_gpadl(device, net_device, ndev);
494
495 exit:
496 return ret;
497 }
498
499 /* Negotiate NVSP protocol version */
500 static int negotiate_nvsp_ver(struct hv_device *device,
501 struct netvsc_device *net_device,
502 struct nvsp_message *init_packet,
503 u32 nvsp_ver)
504 {
505 struct net_device *ndev = hv_get_drvdata(device);
506 int ret;
507
508 memset(init_packet, 0, sizeof(struct nvsp_message));
509 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
510 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
511 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
512 trace_nvsp_send(ndev, init_packet);
513
514 /* Send the init request */
515 ret = vmbus_sendpacket(device->channel, init_packet,
516 sizeof(struct nvsp_message),
517 (unsigned long)init_packet,
518 VM_PKT_DATA_INBAND,
519 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
520
521 if (ret != 0)
522 return ret;
523
524 wait_for_completion(&net_device->channel_init_wait);
525
526 if (init_packet->msg.init_msg.init_complete.status !=
527 NVSP_STAT_SUCCESS)
528 return -EINVAL;
529
530 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
531 return 0;
532
533 /* NVSPv2 or later: Send NDIS config */
534 memset(init_packet, 0, sizeof(struct nvsp_message));
535 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
536 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
537 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
538
539 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
540 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
541
542 /* Teaming bit is needed to receive link speed updates */
543 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
544 }
545
546 trace_nvsp_send(ndev, init_packet);
547
548 ret = vmbus_sendpacket(device->channel, init_packet,
549 sizeof(struct nvsp_message),
550 (unsigned long)init_packet,
551 VM_PKT_DATA_INBAND, 0);
552
553 return ret;
554 }
555
556 static int netvsc_connect_vsp(struct hv_device *device,
557 struct netvsc_device *net_device,
558 const struct netvsc_device_info *device_info)
559 {
560 struct net_device *ndev = hv_get_drvdata(device);
561 static const u32 ver_list[] = {
562 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
563 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
564 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
565 };
566 struct nvsp_message *init_packet;
567 int ndis_version, i, ret;
568
569 init_packet = &net_device->channel_init_pkt;
570
571 /* Negotiate the latest NVSP protocol supported */
572 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
573 if (negotiate_nvsp_ver(device, net_device, init_packet,
574 ver_list[i]) == 0) {
575 net_device->nvsp_version = ver_list[i];
576 break;
577 }
578
579 if (i < 0) {
580 ret = -EPROTO;
581 goto cleanup;
582 }
583
584 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
585
586 /* Send the ndis version */
587 memset(init_packet, 0, sizeof(struct nvsp_message));
588
589 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
590 ndis_version = 0x00060001;
591 else
592 ndis_version = 0x0006001e;
593
594 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
595 init_packet->msg.v1_msg.
596 send_ndis_ver.ndis_major_ver =
597 (ndis_version & 0xFFFF0000) >> 16;
598 init_packet->msg.v1_msg.
599 send_ndis_ver.ndis_minor_ver =
600 ndis_version & 0xFFFF;
601
602 trace_nvsp_send(ndev, init_packet);
603
604 /* Send the init request */
605 ret = vmbus_sendpacket(device->channel, init_packet,
606 sizeof(struct nvsp_message),
607 (unsigned long)init_packet,
608 VM_PKT_DATA_INBAND, 0);
609 if (ret != 0)
610 goto cleanup;
611
612
613 ret = netvsc_init_buf(device, net_device, device_info);
614
615 cleanup:
616 return ret;
617 }
618
619 /*
620 * netvsc_device_remove - Callback when the root bus device is removed
621 */
622 void netvsc_device_remove(struct hv_device *device)
623 {
624 struct net_device *ndev = hv_get_drvdata(device);
625 struct net_device_context *net_device_ctx = netdev_priv(ndev);
626 struct netvsc_device *net_device
627 = rtnl_dereference(net_device_ctx->nvdev);
628 int i;
629
630 /*
631 * Revoke receive buffer. If host is pre-Win2016 then tear down
632 * receive buffer GPADL. Do the same for send buffer.
633 */
634 netvsc_revoke_recv_buf(device, net_device, ndev);
635 if (vmbus_proto_version < VERSION_WIN10)
636 netvsc_teardown_recv_gpadl(device, net_device, ndev);
637
638 netvsc_revoke_send_buf(device, net_device, ndev);
639 if (vmbus_proto_version < VERSION_WIN10)
640 netvsc_teardown_send_gpadl(device, net_device, ndev);
641
642 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
643
644 /* And disassociate NAPI context from device */
645 for (i = 0; i < net_device->num_chn; i++)
646 netif_napi_del(&net_device->chan_table[i].napi);
647
648 /*
649 * At this point, no one should be accessing net_device
650 * except in here
651 */
652 netdev_dbg(ndev, "net device safe to remove\n");
653
654 /* Now, we can close the channel safely */
655 vmbus_close(device->channel);
656
657 /*
658 * If host is Win2016 or higher then we do the GPADL tear down
659 * here after VMBus is closed.
660 */
661 if (vmbus_proto_version >= VERSION_WIN10) {
662 netvsc_teardown_recv_gpadl(device, net_device, ndev);
663 netvsc_teardown_send_gpadl(device, net_device, ndev);
664 }
665
666 /* Release all resources */
667 free_netvsc_device_rcu(net_device);
668 }
669
670 #define RING_AVAIL_PERCENT_HIWATER 20
671 #define RING_AVAIL_PERCENT_LOWATER 10
672
673 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
674 u32 index)
675 {
676 sync_change_bit(index, net_device->send_section_map);
677 }
678
679 static void netvsc_send_tx_complete(struct net_device *ndev,
680 struct netvsc_device *net_device,
681 struct vmbus_channel *channel,
682 const struct vmpacket_descriptor *desc,
683 int budget)
684 {
685 struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
686 struct net_device_context *ndev_ctx = netdev_priv(ndev);
687 u16 q_idx = 0;
688 int queue_sends;
689
690 /* Notify the layer above us */
691 if (likely(skb)) {
692 const struct hv_netvsc_packet *packet
693 = (struct hv_netvsc_packet *)skb->cb;
694 u32 send_index = packet->send_buf_index;
695 struct netvsc_stats *tx_stats;
696
697 if (send_index != NETVSC_INVALID_INDEX)
698 netvsc_free_send_slot(net_device, send_index);
699 q_idx = packet->q_idx;
700
701 tx_stats = &net_device->chan_table[q_idx].tx_stats;
702
703 u64_stats_update_begin(&tx_stats->syncp);
704 tx_stats->packets += packet->total_packets;
705 tx_stats->bytes += packet->total_bytes;
706 u64_stats_update_end(&tx_stats->syncp);
707
708 napi_consume_skb(skb, budget);
709 }
710
711 queue_sends =
712 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
713
714 if (unlikely(net_device->destroy)) {
715 if (queue_sends == 0)
716 wake_up(&net_device->wait_drain);
717 } else {
718 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
719
720 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
721 (hv_get_avail_to_write_percent(&channel->outbound) >
722 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
723 netif_tx_wake_queue(txq);
724 ndev_ctx->eth_stats.wake_queue++;
725 }
726 }
727 }
728
729 static void netvsc_send_completion(struct net_device *ndev,
730 struct netvsc_device *net_device,
731 struct vmbus_channel *incoming_channel,
732 const struct vmpacket_descriptor *desc,
733 int budget)
734 {
735 const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
736
737 switch (nvsp_packet->hdr.msg_type) {
738 case NVSP_MSG_TYPE_INIT_COMPLETE:
739 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
740 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
741 case NVSP_MSG5_TYPE_SUBCHANNEL:
742 /* Copy the response back */
743 memcpy(&net_device->channel_init_pkt, nvsp_packet,
744 sizeof(struct nvsp_message));
745 complete(&net_device->channel_init_wait);
746 break;
747
748 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
749 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
750 desc, budget);
751 break;
752
753 default:
754 netdev_err(ndev,
755 "Unknown send completion type %d received!!\n",
756 nvsp_packet->hdr.msg_type);
757 }
758 }
759
760 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
761 {
762 unsigned long *map_addr = net_device->send_section_map;
763 unsigned int i;
764
765 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
766 if (sync_test_and_set_bit(i, map_addr) == 0)
767 return i;
768 }
769
770 return NETVSC_INVALID_INDEX;
771 }
772
773 static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
774 unsigned int section_index,
775 u32 pend_size,
776 struct hv_netvsc_packet *packet,
777 struct rndis_message *rndis_msg,
778 struct hv_page_buffer *pb,
779 bool xmit_more)
780 {
781 char *start = net_device->send_buf;
782 char *dest = start + (section_index * net_device->send_section_size)
783 + pend_size;
784 int i;
785 u32 padding = 0;
786 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
787 packet->page_buf_cnt;
788 u32 remain;
789
790 /* Add padding */
791 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
792 if (xmit_more && remain) {
793 padding = net_device->pkt_align - remain;
794 rndis_msg->msg_len += padding;
795 packet->total_data_buflen += padding;
796 }
797
798 for (i = 0; i < page_count; i++) {
799 char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT);
800 u32 offset = pb[i].offset;
801 u32 len = pb[i].len;
802
803 memcpy(dest, (src + offset), len);
804 dest += len;
805 }
806
807 if (padding)
808 memset(dest, 0, padding);
809 }
810
811 static inline int netvsc_send_pkt(
812 struct hv_device *device,
813 struct hv_netvsc_packet *packet,
814 struct netvsc_device *net_device,
815 struct hv_page_buffer *pb,
816 struct sk_buff *skb)
817 {
818 struct nvsp_message nvmsg;
819 struct nvsp_1_message_send_rndis_packet *rpkt =
820 &nvmsg.msg.v1_msg.send_rndis_pkt;
821 struct netvsc_channel * const nvchan =
822 &net_device->chan_table[packet->q_idx];
823 struct vmbus_channel *out_channel = nvchan->channel;
824 struct net_device *ndev = hv_get_drvdata(device);
825 struct net_device_context *ndev_ctx = netdev_priv(ndev);
826 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
827 u64 req_id;
828 int ret;
829 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
830
831 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
832 if (skb)
833 rpkt->channel_type = 0; /* 0 is RMC_DATA */
834 else
835 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
836
837 rpkt->send_buf_section_index = packet->send_buf_index;
838 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
839 rpkt->send_buf_section_size = 0;
840 else
841 rpkt->send_buf_section_size = packet->total_data_buflen;
842
843 req_id = (ulong)skb;
844
845 if (out_channel->rescind)
846 return -ENODEV;
847
848 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
849
850 if (packet->page_buf_cnt) {
851 if (packet->cp_partial)
852 pb += packet->rmsg_pgcnt;
853
854 ret = vmbus_sendpacket_pagebuffer(out_channel,
855 pb, packet->page_buf_cnt,
856 &nvmsg, sizeof(nvmsg),
857 req_id);
858 } else {
859 ret = vmbus_sendpacket(out_channel,
860 &nvmsg, sizeof(nvmsg),
861 req_id, VM_PKT_DATA_INBAND,
862 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
863 }
864
865 if (ret == 0) {
866 atomic_inc_return(&nvchan->queue_sends);
867
868 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
869 netif_tx_stop_queue(txq);
870 ndev_ctx->eth_stats.stop_queue++;
871 }
872 } else if (ret == -EAGAIN) {
873 netif_tx_stop_queue(txq);
874 ndev_ctx->eth_stats.stop_queue++;
875 } else {
876 netdev_err(ndev,
877 "Unable to send packet pages %u len %u, ret %d\n",
878 packet->page_buf_cnt, packet->total_data_buflen,
879 ret);
880 }
881
882 if (netif_tx_queue_stopped(txq) &&
883 atomic_read(&nvchan->queue_sends) < 1 &&
884 !net_device->tx_disable) {
885 netif_tx_wake_queue(txq);
886 ndev_ctx->eth_stats.wake_queue++;
887 if (ret == -EAGAIN)
888 ret = -ENOSPC;
889 }
890
891 return ret;
892 }
893
894 /* Move packet out of multi send data (msd), and clear msd */
895 static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
896 struct sk_buff **msd_skb,
897 struct multi_send_data *msdp)
898 {
899 *msd_skb = msdp->skb;
900 *msd_send = msdp->pkt;
901 msdp->skb = NULL;
902 msdp->pkt = NULL;
903 msdp->count = 0;
904 }
905
906 /* RCU already held by caller */
907 int netvsc_send(struct net_device *ndev,
908 struct hv_netvsc_packet *packet,
909 struct rndis_message *rndis_msg,
910 struct hv_page_buffer *pb,
911 struct sk_buff *skb)
912 {
913 struct net_device_context *ndev_ctx = netdev_priv(ndev);
914 struct netvsc_device *net_device
915 = rcu_dereference_bh(ndev_ctx->nvdev);
916 struct hv_device *device = ndev_ctx->device_ctx;
917 int ret = 0;
918 struct netvsc_channel *nvchan;
919 u32 pktlen = packet->total_data_buflen, msd_len = 0;
920 unsigned int section_index = NETVSC_INVALID_INDEX;
921 struct multi_send_data *msdp;
922 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
923 struct sk_buff *msd_skb = NULL;
924 bool try_batch, xmit_more;
925
926 /* If device is rescinded, return error and packet will get dropped. */
927 if (unlikely(!net_device || net_device->destroy))
928 return -ENODEV;
929
930 nvchan = &net_device->chan_table[packet->q_idx];
931 packet->send_buf_index = NETVSC_INVALID_INDEX;
932 packet->cp_partial = false;
933
934 /* Send control message directly without accessing msd (Multi-Send
935 * Data) field which may be changed during data packet processing.
936 */
937 if (!skb)
938 return netvsc_send_pkt(device, packet, net_device, pb, skb);
939
940 /* batch packets in send buffer if possible */
941 msdp = &nvchan->msd;
942 if (msdp->pkt)
943 msd_len = msdp->pkt->total_data_buflen;
944
945 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
946 if (try_batch && msd_len + pktlen + net_device->pkt_align <
947 net_device->send_section_size) {
948 section_index = msdp->pkt->send_buf_index;
949
950 } else if (try_batch && msd_len + packet->rmsg_size <
951 net_device->send_section_size) {
952 section_index = msdp->pkt->send_buf_index;
953 packet->cp_partial = true;
954
955 } else if (pktlen + net_device->pkt_align <
956 net_device->send_section_size) {
957 section_index = netvsc_get_next_send_section(net_device);
958 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
959 ++ndev_ctx->eth_stats.tx_send_full;
960 } else {
961 move_pkt_msd(&msd_send, &msd_skb, msdp);
962 msd_len = 0;
963 }
964 }
965
966 /* Keep aggregating only if stack says more data is coming
967 * and not doing mixed modes send and not flow blocked
968 */
969 xmit_more = skb->xmit_more &&
970 !packet->cp_partial &&
971 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
972
973 if (section_index != NETVSC_INVALID_INDEX) {
974 netvsc_copy_to_send_buf(net_device,
975 section_index, msd_len,
976 packet, rndis_msg, pb, xmit_more);
977
978 packet->send_buf_index = section_index;
979
980 if (packet->cp_partial) {
981 packet->page_buf_cnt -= packet->rmsg_pgcnt;
982 packet->total_data_buflen = msd_len + packet->rmsg_size;
983 } else {
984 packet->page_buf_cnt = 0;
985 packet->total_data_buflen += msd_len;
986 }
987
988 if (msdp->pkt) {
989 packet->total_packets += msdp->pkt->total_packets;
990 packet->total_bytes += msdp->pkt->total_bytes;
991 }
992
993 if (msdp->skb)
994 dev_consume_skb_any(msdp->skb);
995
996 if (xmit_more) {
997 msdp->skb = skb;
998 msdp->pkt = packet;
999 msdp->count++;
1000 } else {
1001 cur_send = packet;
1002 msdp->skb = NULL;
1003 msdp->pkt = NULL;
1004 msdp->count = 0;
1005 }
1006 } else {
1007 move_pkt_msd(&msd_send, &msd_skb, msdp);
1008 cur_send = packet;
1009 }
1010
1011 if (msd_send) {
1012 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1013 NULL, msd_skb);
1014
1015 if (m_ret != 0) {
1016 netvsc_free_send_slot(net_device,
1017 msd_send->send_buf_index);
1018 dev_kfree_skb_any(msd_skb);
1019 }
1020 }
1021
1022 if (cur_send)
1023 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1024
1025 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1026 netvsc_free_send_slot(net_device, section_index);
1027
1028 return ret;
1029 }
1030
1031 /* Send pending recv completions */
1032 static int send_recv_completions(struct net_device *ndev,
1033 struct netvsc_device *nvdev,
1034 struct netvsc_channel *nvchan)
1035 {
1036 struct multi_recv_comp *mrc = &nvchan->mrc;
1037 struct recv_comp_msg {
1038 struct nvsp_message_header hdr;
1039 u32 status;
1040 } __packed;
1041 struct recv_comp_msg msg = {
1042 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1043 };
1044 int ret;
1045
1046 while (mrc->first != mrc->next) {
1047 const struct recv_comp_data *rcd
1048 = mrc->slots + mrc->first;
1049
1050 msg.status = rcd->status;
1051 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1052 rcd->tid, VM_PKT_COMP, 0);
1053 if (unlikely(ret)) {
1054 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1055
1056 ++ndev_ctx->eth_stats.rx_comp_busy;
1057 return ret;
1058 }
1059
1060 if (++mrc->first == nvdev->recv_completion_cnt)
1061 mrc->first = 0;
1062 }
1063
1064 /* receive completion ring has been emptied */
1065 if (unlikely(nvdev->destroy))
1066 wake_up(&nvdev->wait_drain);
1067
1068 return 0;
1069 }
1070
1071 /* Count how many receive completions are outstanding */
1072 static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1073 const struct multi_recv_comp *mrc,
1074 u32 *filled, u32 *avail)
1075 {
1076 u32 count = nvdev->recv_completion_cnt;
1077
1078 if (mrc->next >= mrc->first)
1079 *filled = mrc->next - mrc->first;
1080 else
1081 *filled = (count - mrc->first) + mrc->next;
1082
1083 *avail = count - *filled - 1;
1084 }
1085
1086 /* Add receive complete to ring to send to host. */
1087 static void enq_receive_complete(struct net_device *ndev,
1088 struct netvsc_device *nvdev, u16 q_idx,
1089 u64 tid, u32 status)
1090 {
1091 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1092 struct multi_recv_comp *mrc = &nvchan->mrc;
1093 struct recv_comp_data *rcd;
1094 u32 filled, avail;
1095
1096 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1097
1098 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1099 send_recv_completions(ndev, nvdev, nvchan);
1100 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1101 }
1102
1103 if (unlikely(!avail)) {
1104 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1105 q_idx, tid);
1106 return;
1107 }
1108
1109 rcd = mrc->slots + mrc->next;
1110 rcd->tid = tid;
1111 rcd->status = status;
1112
1113 if (++mrc->next == nvdev->recv_completion_cnt)
1114 mrc->next = 0;
1115 }
1116
1117 static int netvsc_receive(struct net_device *ndev,
1118 struct netvsc_device *net_device,
1119 struct vmbus_channel *channel,
1120 const struct vmpacket_descriptor *desc,
1121 const struct nvsp_message *nvsp)
1122 {
1123 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1124 const struct vmtransfer_page_packet_header *vmxferpage_packet
1125 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1126 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1127 char *recv_buf = net_device->recv_buf;
1128 u32 status = NVSP_STAT_SUCCESS;
1129 int i;
1130 int count = 0;
1131
1132 /* Make sure this is a valid nvsp packet */
1133 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1134 netif_err(net_device_ctx, rx_err, ndev,
1135 "Unknown nvsp packet type received %u\n",
1136 nvsp->hdr.msg_type);
1137 return 0;
1138 }
1139
1140 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1141 netif_err(net_device_ctx, rx_err, ndev,
1142 "Invalid xfer page set id - expecting %x got %x\n",
1143 NETVSC_RECEIVE_BUFFER_ID,
1144 vmxferpage_packet->xfer_pageset_id);
1145 return 0;
1146 }
1147
1148 count = vmxferpage_packet->range_cnt;
1149
1150 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1151 for (i = 0; i < count; i++) {
1152 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1153 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1154 void *data;
1155 int ret;
1156
1157 if (unlikely(offset + buflen > net_device->recv_buf_size)) {
1158 status = NVSP_STAT_FAIL;
1159 netif_err(net_device_ctx, rx_err, ndev,
1160 "Packet offset:%u + len:%u too big\n",
1161 offset, buflen);
1162
1163 continue;
1164 }
1165
1166 data = recv_buf + offset;
1167
1168 trace_rndis_recv(ndev, q_idx, data);
1169
1170 /* Pass it to the upper layer */
1171 ret = rndis_filter_receive(ndev, net_device,
1172 channel, data, buflen);
1173
1174 if (unlikely(ret != NVSP_STAT_SUCCESS))
1175 status = NVSP_STAT_FAIL;
1176 }
1177
1178 enq_receive_complete(ndev, net_device, q_idx,
1179 vmxferpage_packet->d.trans_id, status);
1180
1181 return count;
1182 }
1183
1184 static void netvsc_send_table(struct net_device *ndev,
1185 struct netvsc_device *nvscdev,
1186 const struct nvsp_message *nvmsg,
1187 u32 msglen)
1188 {
1189 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1190 u32 count, offset, *tab;
1191 int i;
1192
1193 count = nvmsg->msg.v5_msg.send_table.count;
1194 offset = nvmsg->msg.v5_msg.send_table.offset;
1195
1196 if (count != VRSS_SEND_TAB_SIZE) {
1197 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1198 return;
1199 }
1200
1201 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1202 * wrong due to a host bug. So fix the offset here.
1203 */
1204 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1205 msglen >= sizeof(struct nvsp_message_header) +
1206 sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1207 offset = sizeof(struct nvsp_message_header) +
1208 sizeof(union nvsp_6_message_uber);
1209
1210 /* Boundary check for all versions */
1211 if (offset > msglen - count * sizeof(u32)) {
1212 netdev_err(ndev, "Received send-table offset too big:%u\n",
1213 offset);
1214 return;
1215 }
1216
1217 tab = (void *)nvmsg + offset;
1218
1219 for (i = 0; i < count; i++)
1220 net_device_ctx->tx_table[i] = tab[i];
1221 }
1222
1223 static void netvsc_send_vf(struct net_device *ndev,
1224 const struct nvsp_message *nvmsg)
1225 {
1226 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1227
1228 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1229 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1230 netdev_info(ndev, "VF slot %u %s\n",
1231 net_device_ctx->vf_serial,
1232 net_device_ctx->vf_alloc ? "added" : "removed");
1233 }
1234
1235 static void netvsc_receive_inband(struct net_device *ndev,
1236 struct netvsc_device *nvscdev,
1237 const struct nvsp_message *nvmsg,
1238 u32 msglen)
1239 {
1240 switch (nvmsg->hdr.msg_type) {
1241 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1242 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1243 break;
1244
1245 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1246 netvsc_send_vf(ndev, nvmsg);
1247 break;
1248 }
1249 }
1250
1251 static int netvsc_process_raw_pkt(struct hv_device *device,
1252 struct vmbus_channel *channel,
1253 struct netvsc_device *net_device,
1254 struct net_device *ndev,
1255 const struct vmpacket_descriptor *desc,
1256 int budget)
1257 {
1258 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1259 u32 msglen = hv_pkt_datalen(desc);
1260
1261 trace_nvsp_recv(ndev, channel, nvmsg);
1262
1263 switch (desc->type) {
1264 case VM_PKT_COMP:
1265 netvsc_send_completion(ndev, net_device, channel,
1266 desc, budget);
1267 break;
1268
1269 case VM_PKT_DATA_USING_XFER_PAGES:
1270 return netvsc_receive(ndev, net_device, channel,
1271 desc, nvmsg);
1272 break;
1273
1274 case VM_PKT_DATA_INBAND:
1275 netvsc_receive_inband(ndev, net_device, nvmsg, msglen);
1276 break;
1277
1278 default:
1279 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1280 desc->type, desc->trans_id);
1281 break;
1282 }
1283
1284 return 0;
1285 }
1286
1287 static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1288 {
1289 struct vmbus_channel *primary = channel->primary_channel;
1290
1291 return primary ? primary->device_obj : channel->device_obj;
1292 }
1293
1294 /* Network processing softirq
1295 * Process data in incoming ring buffer from host
1296 * Stops when ring is empty or budget is met or exceeded.
1297 */
1298 int netvsc_poll(struct napi_struct *napi, int budget)
1299 {
1300 struct netvsc_channel *nvchan
1301 = container_of(napi, struct netvsc_channel, napi);
1302 struct netvsc_device *net_device = nvchan->net_device;
1303 struct vmbus_channel *channel = nvchan->channel;
1304 struct hv_device *device = netvsc_channel_to_device(channel);
1305 struct net_device *ndev = hv_get_drvdata(device);
1306 int work_done = 0;
1307 int ret;
1308
1309 /* If starting a new interval */
1310 if (!nvchan->desc)
1311 nvchan->desc = hv_pkt_iter_first(channel);
1312
1313 while (nvchan->desc && work_done < budget) {
1314 work_done += netvsc_process_raw_pkt(device, channel, net_device,
1315 ndev, nvchan->desc, budget);
1316 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1317 }
1318
1319 /* Send any pending receive completions */
1320 ret = send_recv_completions(ndev, net_device, nvchan);
1321
1322 /* If it did not exhaust NAPI budget this time
1323 * and not doing busy poll
1324 * then re-enable host interrupts
1325 * and reschedule if ring is not empty
1326 * or sending receive completion failed.
1327 */
1328 if (work_done < budget &&
1329 napi_complete_done(napi, work_done) &&
1330 (ret || hv_end_read(&channel->inbound)) &&
1331 napi_schedule_prep(napi)) {
1332 hv_begin_read(&channel->inbound);
1333 __napi_schedule(napi);
1334 }
1335
1336 /* Driver may overshoot since multiple packets per descriptor */
1337 return min(work_done, budget);
1338 }
1339
1340 /* Call back when data is available in host ring buffer.
1341 * Processing is deferred until network softirq (NAPI)
1342 */
1343 void netvsc_channel_cb(void *context)
1344 {
1345 struct netvsc_channel *nvchan = context;
1346 struct vmbus_channel *channel = nvchan->channel;
1347 struct hv_ring_buffer_info *rbi = &channel->inbound;
1348
1349 /* preload first vmpacket descriptor */
1350 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1351
1352 if (napi_schedule_prep(&nvchan->napi)) {
1353 /* disable interupts from host */
1354 hv_begin_read(rbi);
1355
1356 __napi_schedule_irqoff(&nvchan->napi);
1357 }
1358 }
1359
1360 /*
1361 * netvsc_device_add - Callback when the device belonging to this
1362 * driver is added
1363 */
1364 struct netvsc_device *netvsc_device_add(struct hv_device *device,
1365 const struct netvsc_device_info *device_info)
1366 {
1367 int i, ret = 0;
1368 struct netvsc_device *net_device;
1369 struct net_device *ndev = hv_get_drvdata(device);
1370 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1371
1372 net_device = alloc_net_device();
1373 if (!net_device)
1374 return ERR_PTR(-ENOMEM);
1375
1376 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1377 net_device_ctx->tx_table[i] = 0;
1378
1379 /* Because the device uses NAPI, all the interrupt batching and
1380 * control is done via Net softirq, not the channel handling
1381 */
1382 set_channel_read_mode(device->channel, HV_CALL_ISR);
1383
1384 /* If we're reopening the device we may have multiple queues, fill the
1385 * chn_table with the default channel to use it before subchannels are
1386 * opened.
1387 * Initialize the channel state before we open;
1388 * we can be interrupted as soon as we open the channel.
1389 */
1390
1391 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1392 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1393
1394 nvchan->channel = device->channel;
1395 nvchan->net_device = net_device;
1396 u64_stats_init(&nvchan->tx_stats.syncp);
1397 u64_stats_init(&nvchan->rx_stats.syncp);
1398 }
1399
1400 /* Enable NAPI handler before init callbacks */
1401 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1402 netvsc_poll, NAPI_POLL_WEIGHT);
1403
1404 /* Open the channel */
1405 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1406 netvsc_ring_bytes, NULL, 0,
1407 netvsc_channel_cb, net_device->chan_table);
1408
1409 if (ret != 0) {
1410 netdev_err(ndev, "unable to open channel: %d\n", ret);
1411 goto cleanup;
1412 }
1413
1414 /* Channel is opened */
1415 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1416
1417 napi_enable(&net_device->chan_table[0].napi);
1418
1419 /* Connect with the NetVsp */
1420 ret = netvsc_connect_vsp(device, net_device, device_info);
1421 if (ret != 0) {
1422 netdev_err(ndev,
1423 "unable to connect to NetVSP - %d\n", ret);
1424 goto close;
1425 }
1426
1427 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1428 * populated.
1429 */
1430 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1431
1432 return net_device;
1433
1434 close:
1435 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1436 napi_disable(&net_device->chan_table[0].napi);
1437
1438 /* Now, we can close the channel safely */
1439 vmbus_close(device->channel);
1440
1441 cleanup:
1442 netif_napi_del(&net_device->chan_table[0].napi);
1443 free_netvsc_device(&net_device->rcu);
1444
1445 return ERR_PTR(ret);
1446 }
Linux with added FPC-III support