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