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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 <asm/sync_bitops.h>
33
34#include "hyperv_net.h"
35
36
37static struct netvsc_device *alloc_net_device(struct hv_device *device)
38{
39 struct netvsc_device *net_device;
40 struct net_device *ndev = hv_get_drvdata(device);
41
42 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
43 if (!net_device)
44 return NULL;
45
46 net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
47 if (!net_device->cb_buffer) {
48 kfree(net_device);
49 return NULL;
50 }
51
52 init_waitqueue_head(&net_device->wait_drain);
53 net_device->start_remove = false;
54 net_device->destroy = false;
55 net_device->dev = device;
56 net_device->ndev = ndev;
57 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
58 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
59
60 hv_set_drvdata(device, net_device);
61 return net_device;
62}
63
64static void free_netvsc_device(struct netvsc_device *nvdev)
65{
66 kfree(nvdev->cb_buffer);
67 kfree(nvdev);
68}
69
70static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
71{
72 struct netvsc_device *net_device;
73
74 net_device = hv_get_drvdata(device);
75 if (net_device && net_device->destroy)
76 net_device = NULL;
77
78 return net_device;
79}
80
81static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
82{
83 struct netvsc_device *net_device;
84
85 net_device = hv_get_drvdata(device);
86
87 if (!net_device)
88 goto get_in_err;
89
90 if (net_device->destroy &&
91 atomic_read(&net_device->num_outstanding_sends) == 0)
92 net_device = NULL;
93
94get_in_err:
95 return net_device;
96}
97
98
99static int netvsc_destroy_buf(struct netvsc_device *net_device)
100{
101 struct nvsp_message *revoke_packet;
102 int ret = 0;
103 struct net_device *ndev = net_device->ndev;
104
105 /*
106 * If we got a section count, it means we received a
107 * SendReceiveBufferComplete msg (ie sent
108 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
109 * to send a revoke msg here
110 */
111 if (net_device->recv_section_cnt) {
112 /* Send the revoke receive buffer */
113 revoke_packet = &net_device->revoke_packet;
114 memset(revoke_packet, 0, sizeof(struct nvsp_message));
115
116 revoke_packet->hdr.msg_type =
117 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
118 revoke_packet->msg.v1_msg.
119 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
120
121 ret = vmbus_sendpacket(net_device->dev->channel,
122 revoke_packet,
123 sizeof(struct nvsp_message),
124 (unsigned long)revoke_packet,
125 VM_PKT_DATA_INBAND, 0);
126 /*
127 * If we failed here, we might as well return and
128 * have a leak rather than continue and a bugchk
129 */
130 if (ret != 0) {
131 netdev_err(ndev, "unable to send "
132 "revoke receive buffer to netvsp\n");
133 return ret;
134 }
135 }
136
137 /* Teardown the gpadl on the vsp end */
138 if (net_device->recv_buf_gpadl_handle) {
139 ret = vmbus_teardown_gpadl(net_device->dev->channel,
140 net_device->recv_buf_gpadl_handle);
141
142 /* If we failed here, we might as well return and have a leak
143 * rather than continue and a bugchk
144 */
145 if (ret != 0) {
146 netdev_err(ndev,
147 "unable to teardown receive buffer's gpadl\n");
148 return ret;
149 }
150 net_device->recv_buf_gpadl_handle = 0;
151 }
152
153 if (net_device->recv_buf) {
154 /* Free up the receive buffer */
155 vfree(net_device->recv_buf);
156 net_device->recv_buf = NULL;
157 }
158
159 if (net_device->recv_section) {
160 net_device->recv_section_cnt = 0;
161 kfree(net_device->recv_section);
162 net_device->recv_section = NULL;
163 }
164
165 /* Deal with the send buffer we may have setup.
166 * If we got a send section size, it means we received a
167 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
168 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
169 * to send a revoke msg here
170 */
171 if (net_device->send_section_size) {
172 /* Send the revoke receive buffer */
173 revoke_packet = &net_device->revoke_packet;
174 memset(revoke_packet, 0, sizeof(struct nvsp_message));
175
176 revoke_packet->hdr.msg_type =
177 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
178 revoke_packet->msg.v1_msg.revoke_send_buf.id =
179 NETVSC_SEND_BUFFER_ID;
180
181 ret = vmbus_sendpacket(net_device->dev->channel,
182 revoke_packet,
183 sizeof(struct nvsp_message),
184 (unsigned long)revoke_packet,
185 VM_PKT_DATA_INBAND, 0);
186 /* If we failed here, we might as well return and
187 * have a leak rather than continue and a bugchk
188 */
189 if (ret != 0) {
190 netdev_err(ndev, "unable to send "
191 "revoke send buffer to netvsp\n");
192 return ret;
193 }
194 }
195 /* Teardown the gpadl on the vsp end */
196 if (net_device->send_buf_gpadl_handle) {
197 ret = vmbus_teardown_gpadl(net_device->dev->channel,
198 net_device->send_buf_gpadl_handle);
199
200 /* If we failed here, we might as well return and have a leak
201 * rather than continue and a bugchk
202 */
203 if (ret != 0) {
204 netdev_err(ndev,
205 "unable to teardown send buffer's gpadl\n");
206 return ret;
207 }
208 net_device->send_buf_gpadl_handle = 0;
209 }
210 if (net_device->send_buf) {
211 /* Free up the send buffer */
212 vfree(net_device->send_buf);
213 net_device->send_buf = NULL;
214 }
215 kfree(net_device->send_section_map);
216
217 return ret;
218}
219
220static int netvsc_init_buf(struct hv_device *device)
221{
222 int ret = 0;
223 unsigned long t;
224 struct netvsc_device *net_device;
225 struct nvsp_message *init_packet;
226 struct net_device *ndev;
227 int node;
228
229 net_device = get_outbound_net_device(device);
230 if (!net_device)
231 return -ENODEV;
232 ndev = net_device->ndev;
233
234 node = cpu_to_node(device->channel->target_cpu);
235 net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
236 if (!net_device->recv_buf)
237 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
238
239 if (!net_device->recv_buf) {
240 netdev_err(ndev, "unable to allocate receive "
241 "buffer of size %d\n", net_device->recv_buf_size);
242 ret = -ENOMEM;
243 goto cleanup;
244 }
245
246 /*
247 * Establish the gpadl handle for this buffer on this
248 * channel. Note: This call uses the vmbus connection rather
249 * than the channel to establish the gpadl handle.
250 */
251 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
252 net_device->recv_buf_size,
253 &net_device->recv_buf_gpadl_handle);
254 if (ret != 0) {
255 netdev_err(ndev,
256 "unable to establish receive buffer's gpadl\n");
257 goto cleanup;
258 }
259
260
261 /* Notify the NetVsp of the gpadl handle */
262 init_packet = &net_device->channel_init_pkt;
263
264 memset(init_packet, 0, sizeof(struct nvsp_message));
265
266 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
267 init_packet->msg.v1_msg.send_recv_buf.
268 gpadl_handle = net_device->recv_buf_gpadl_handle;
269 init_packet->msg.v1_msg.
270 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
271
272 /* Send the gpadl notification request */
273 ret = vmbus_sendpacket(device->channel, init_packet,
274 sizeof(struct nvsp_message),
275 (unsigned long)init_packet,
276 VM_PKT_DATA_INBAND,
277 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
278 if (ret != 0) {
279 netdev_err(ndev,
280 "unable to send receive buffer's gpadl to netvsp\n");
281 goto cleanup;
282 }
283
284 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
285 BUG_ON(t == 0);
286
287
288 /* Check the response */
289 if (init_packet->msg.v1_msg.
290 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
291 netdev_err(ndev, "Unable to complete receive buffer "
292 "initialization with NetVsp - status %d\n",
293 init_packet->msg.v1_msg.
294 send_recv_buf_complete.status);
295 ret = -EINVAL;
296 goto cleanup;
297 }
298
299 /* Parse the response */
300
301 net_device->recv_section_cnt = init_packet->msg.
302 v1_msg.send_recv_buf_complete.num_sections;
303
304 net_device->recv_section = kmemdup(
305 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
306 net_device->recv_section_cnt *
307 sizeof(struct nvsp_1_receive_buffer_section),
308 GFP_KERNEL);
309 if (net_device->recv_section == NULL) {
310 ret = -EINVAL;
311 goto cleanup;
312 }
313
314 /*
315 * For 1st release, there should only be 1 section that represents the
316 * entire receive buffer
317 */
318 if (net_device->recv_section_cnt != 1 ||
319 net_device->recv_section->offset != 0) {
320 ret = -EINVAL;
321 goto cleanup;
322 }
323
324 /* Now setup the send buffer.
325 */
326 net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
327 if (!net_device->send_buf)
328 net_device->send_buf = vzalloc(net_device->send_buf_size);
329 if (!net_device->send_buf) {
330 netdev_err(ndev, "unable to allocate send "
331 "buffer of size %d\n", net_device->send_buf_size);
332 ret = -ENOMEM;
333 goto cleanup;
334 }
335
336 /* Establish the gpadl handle for this buffer on this
337 * channel. Note: This call uses the vmbus connection rather
338 * than the channel to establish the gpadl handle.
339 */
340 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
341 net_device->send_buf_size,
342 &net_device->send_buf_gpadl_handle);
343 if (ret != 0) {
344 netdev_err(ndev,
345 "unable to establish send buffer's gpadl\n");
346 goto cleanup;
347 }
348
349 /* Notify the NetVsp of the gpadl handle */
350 init_packet = &net_device->channel_init_pkt;
351 memset(init_packet, 0, sizeof(struct nvsp_message));
352 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
353 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
354 net_device->send_buf_gpadl_handle;
355 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
356
357 /* Send the gpadl notification request */
358 ret = vmbus_sendpacket(device->channel, init_packet,
359 sizeof(struct nvsp_message),
360 (unsigned long)init_packet,
361 VM_PKT_DATA_INBAND,
362 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
363 if (ret != 0) {
364 netdev_err(ndev,
365 "unable to send send buffer's gpadl to netvsp\n");
366 goto cleanup;
367 }
368
369 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
370 BUG_ON(t == 0);
371
372 /* Check the response */
373 if (init_packet->msg.v1_msg.
374 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
375 netdev_err(ndev, "Unable to complete send buffer "
376 "initialization with NetVsp - status %d\n",
377 init_packet->msg.v1_msg.
378 send_send_buf_complete.status);
379 ret = -EINVAL;
380 goto cleanup;
381 }
382
383 /* Parse the response */
384 net_device->send_section_size = init_packet->msg.
385 v1_msg.send_send_buf_complete.section_size;
386
387 /* Section count is simply the size divided by the section size.
388 */
389 net_device->send_section_cnt =
390 net_device->send_buf_size/net_device->send_section_size;
391
392 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
393 net_device->send_section_size, net_device->send_section_cnt);
394
395 /* Setup state for managing the send buffer. */
396 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
397 BITS_PER_LONG);
398
399 net_device->send_section_map =
400 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
401 if (net_device->send_section_map == NULL) {
402 ret = -ENOMEM;
403 goto cleanup;
404 }
405
406 goto exit;
407
408cleanup:
409 netvsc_destroy_buf(net_device);
410
411exit:
412 return ret;
413}
414
415
416/* Negotiate NVSP protocol version */
417static int negotiate_nvsp_ver(struct hv_device *device,
418 struct netvsc_device *net_device,
419 struct nvsp_message *init_packet,
420 u32 nvsp_ver)
421{
422 int ret;
423 unsigned long t;
424
425 memset(init_packet, 0, sizeof(struct nvsp_message));
426 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
427 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
428 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
429
430 /* Send the init request */
431 ret = vmbus_sendpacket(device->channel, init_packet,
432 sizeof(struct nvsp_message),
433 (unsigned long)init_packet,
434 VM_PKT_DATA_INBAND,
435 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
436
437 if (ret != 0)
438 return ret;
439
440 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
441
442 if (t == 0)
443 return -ETIMEDOUT;
444
445 if (init_packet->msg.init_msg.init_complete.status !=
446 NVSP_STAT_SUCCESS)
447 return -EINVAL;
448
449 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
450 return 0;
451
452 /* NVSPv2 or later: Send NDIS config */
453 memset(init_packet, 0, sizeof(struct nvsp_message));
454 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
455 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu +
456 ETH_HLEN;
457 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
458
459 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5)
460 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
461
462 ret = vmbus_sendpacket(device->channel, init_packet,
463 sizeof(struct nvsp_message),
464 (unsigned long)init_packet,
465 VM_PKT_DATA_INBAND, 0);
466
467 return ret;
468}
469
470static int netvsc_connect_vsp(struct hv_device *device)
471{
472 int ret;
473 struct netvsc_device *net_device;
474 struct nvsp_message *init_packet;
475 int ndis_version;
476 struct net_device *ndev;
477 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
478 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
479 int i, num_ver = 4; /* number of different NVSP versions */
480
481 net_device = get_outbound_net_device(device);
482 if (!net_device)
483 return -ENODEV;
484 ndev = net_device->ndev;
485
486 init_packet = &net_device->channel_init_pkt;
487
488 /* Negotiate the latest NVSP protocol supported */
489 for (i = num_ver - 1; i >= 0; i--)
490 if (negotiate_nvsp_ver(device, net_device, init_packet,
491 ver_list[i]) == 0) {
492 net_device->nvsp_version = ver_list[i];
493 break;
494 }
495
496 if (i < 0) {
497 ret = -EPROTO;
498 goto cleanup;
499 }
500
501 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
502
503 /* Send the ndis version */
504 memset(init_packet, 0, sizeof(struct nvsp_message));
505
506 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
507 ndis_version = 0x00060001;
508 else
509 ndis_version = 0x0006001e;
510
511 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
512 init_packet->msg.v1_msg.
513 send_ndis_ver.ndis_major_ver =
514 (ndis_version & 0xFFFF0000) >> 16;
515 init_packet->msg.v1_msg.
516 send_ndis_ver.ndis_minor_ver =
517 ndis_version & 0xFFFF;
518
519 /* Send the init request */
520 ret = vmbus_sendpacket(device->channel, init_packet,
521 sizeof(struct nvsp_message),
522 (unsigned long)init_packet,
523 VM_PKT_DATA_INBAND, 0);
524 if (ret != 0)
525 goto cleanup;
526
527 /* Post the big receive buffer to NetVSP */
528 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
529 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
530 else
531 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
532 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
533
534 ret = netvsc_init_buf(device);
535
536cleanup:
537 return ret;
538}
539
540static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
541{
542 netvsc_destroy_buf(net_device);
543}
544
545/*
546 * netvsc_device_remove - Callback when the root bus device is removed
547 */
548int netvsc_device_remove(struct hv_device *device)
549{
550 struct netvsc_device *net_device;
551 unsigned long flags;
552
553 net_device = hv_get_drvdata(device);
554
555 netvsc_disconnect_vsp(net_device);
556
557 /*
558 * Since we have already drained, we don't need to busy wait
559 * as was done in final_release_stor_device()
560 * Note that we cannot set the ext pointer to NULL until
561 * we have drained - to drain the outgoing packets, we need to
562 * allow incoming packets.
563 */
564
565 spin_lock_irqsave(&device->channel->inbound_lock, flags);
566 hv_set_drvdata(device, NULL);
567 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
568
569 /*
570 * At this point, no one should be accessing net_device
571 * except in here
572 */
573 dev_notice(&device->device, "net device safe to remove\n");
574
575 /* Now, we can close the channel safely */
576 vmbus_close(device->channel);
577
578 /* Release all resources */
579 vfree(net_device->sub_cb_buf);
580 free_netvsc_device(net_device);
581 return 0;
582}
583
584
585#define RING_AVAIL_PERCENT_HIWATER 20
586#define RING_AVAIL_PERCENT_LOWATER 10
587
588/*
589 * Get the percentage of available bytes to write in the ring.
590 * The return value is in range from 0 to 100.
591 */
592static inline u32 hv_ringbuf_avail_percent(
593 struct hv_ring_buffer_info *ring_info)
594{
595 u32 avail_read, avail_write;
596
597 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
598
599 return avail_write * 100 / ring_info->ring_datasize;
600}
601
602static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
603 u32 index)
604{
605 sync_change_bit(index, net_device->send_section_map);
606}
607
608static void netvsc_send_completion(struct netvsc_device *net_device,
609 struct vmbus_channel *incoming_channel,
610 struct hv_device *device,
611 struct vmpacket_descriptor *packet)
612{
613 struct nvsp_message *nvsp_packet;
614 struct hv_netvsc_packet *nvsc_packet;
615 struct net_device *ndev;
616 u32 send_index;
617 struct sk_buff *skb;
618
619 ndev = net_device->ndev;
620
621 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
622 (packet->offset8 << 3));
623
624 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
625 (nvsp_packet->hdr.msg_type ==
626 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
627 (nvsp_packet->hdr.msg_type ==
628 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
629 (nvsp_packet->hdr.msg_type ==
630 NVSP_MSG5_TYPE_SUBCHANNEL)) {
631 /* Copy the response back */
632 memcpy(&net_device->channel_init_pkt, nvsp_packet,
633 sizeof(struct nvsp_message));
634 complete(&net_device->channel_init_wait);
635 } else if (nvsp_packet->hdr.msg_type ==
636 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
637 int num_outstanding_sends;
638 u16 q_idx = 0;
639 struct vmbus_channel *channel = device->channel;
640 int queue_sends;
641
642 /* Get the send context */
643 skb = (struct sk_buff *)(unsigned long)packet->trans_id;
644
645 /* Notify the layer above us */
646 if (skb) {
647 nvsc_packet = (struct hv_netvsc_packet *) skb->cb;
648 send_index = nvsc_packet->send_buf_index;
649 if (send_index != NETVSC_INVALID_INDEX)
650 netvsc_free_send_slot(net_device, send_index);
651 q_idx = nvsc_packet->q_idx;
652 channel = incoming_channel;
653 dev_kfree_skb_any(skb);
654 }
655
656 num_outstanding_sends =
657 atomic_dec_return(&net_device->num_outstanding_sends);
658 queue_sends = atomic_dec_return(&net_device->
659 queue_sends[q_idx]);
660
661 if (net_device->destroy && num_outstanding_sends == 0)
662 wake_up(&net_device->wait_drain);
663
664 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
665 !net_device->start_remove &&
666 (hv_ringbuf_avail_percent(&channel->outbound) >
667 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
668 netif_tx_wake_queue(netdev_get_tx_queue(
669 ndev, q_idx));
670 } else {
671 netdev_err(ndev, "Unknown send completion packet type- "
672 "%d received!!\n", nvsp_packet->hdr.msg_type);
673 }
674
675}
676
677static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
678{
679 unsigned long index;
680 u32 max_words = net_device->map_words;
681 unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
682 u32 section_cnt = net_device->send_section_cnt;
683 int ret_val = NETVSC_INVALID_INDEX;
684 int i;
685 int prev_val;
686
687 for (i = 0; i < max_words; i++) {
688 if (!~(map_addr[i]))
689 continue;
690 index = ffz(map_addr[i]);
691 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
692 if (prev_val)
693 continue;
694 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
695 break;
696 ret_val = (index + (i * BITS_PER_LONG));
697 break;
698 }
699 return ret_val;
700}
701
702static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
703 unsigned int section_index,
704 u32 pend_size,
705 struct hv_netvsc_packet *packet,
706 struct rndis_message *rndis_msg,
707 struct hv_page_buffer **pb,
708 struct sk_buff *skb)
709{
710 char *start = net_device->send_buf;
711 char *dest = start + (section_index * net_device->send_section_size)
712 + pend_size;
713 int i;
714 bool is_data_pkt = (skb != NULL) ? true : false;
715 bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
716 u32 msg_size = 0;
717 u32 padding = 0;
718 u32 remain = packet->total_data_buflen % net_device->pkt_align;
719 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
720 packet->page_buf_cnt;
721
722 /* Add padding */
723 if (is_data_pkt && xmit_more && remain &&
724 !packet->cp_partial) {
725 padding = net_device->pkt_align - remain;
726 rndis_msg->msg_len += padding;
727 packet->total_data_buflen += padding;
728 }
729
730 for (i = 0; i < page_count; i++) {
731 char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT);
732 u32 offset = (*pb)[i].offset;
733 u32 len = (*pb)[i].len;
734
735 memcpy(dest, (src + offset), len);
736 msg_size += len;
737 dest += len;
738 }
739
740 if (padding) {
741 memset(dest, 0, padding);
742 msg_size += padding;
743 }
744
745 return msg_size;
746}
747
748static inline int netvsc_send_pkt(
749 struct hv_netvsc_packet *packet,
750 struct netvsc_device *net_device,
751 struct hv_page_buffer **pb,
752 struct sk_buff *skb)
753{
754 struct nvsp_message nvmsg;
755 u16 q_idx = packet->q_idx;
756 struct vmbus_channel *out_channel = net_device->chn_table[q_idx];
757 struct net_device *ndev = net_device->ndev;
758 u64 req_id;
759 int ret;
760 struct hv_page_buffer *pgbuf;
761 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
762 bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
763
764 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
765 if (skb != NULL) {
766 /* 0 is RMC_DATA; */
767 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
768 } else {
769 /* 1 is RMC_CONTROL; */
770 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
771 }
772
773 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
774 packet->send_buf_index;
775 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
776 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
777 else
778 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
779 packet->total_data_buflen;
780
781 req_id = (ulong)skb;
782
783 if (out_channel->rescind)
784 return -ENODEV;
785
786 /*
787 * It is possible that once we successfully place this packet
788 * on the ringbuffer, we may stop the queue. In that case, we want
789 * to notify the host independent of the xmit_more flag. We don't
790 * need to be precise here; in the worst case we may signal the host
791 * unnecessarily.
792 */
793 if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1))
794 xmit_more = false;
795
796 if (packet->page_buf_cnt) {
797 pgbuf = packet->cp_partial ? (*pb) +
798 packet->rmsg_pgcnt : (*pb);
799 ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
800 pgbuf,
801 packet->page_buf_cnt,
802 &nvmsg,
803 sizeof(struct nvsp_message),
804 req_id,
805 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
806 !xmit_more);
807 } else {
808 ret = vmbus_sendpacket_ctl(out_channel, &nvmsg,
809 sizeof(struct nvsp_message),
810 req_id,
811 VM_PKT_DATA_INBAND,
812 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED,
813 !xmit_more);
814 }
815
816 if (ret == 0) {
817 atomic_inc(&net_device->num_outstanding_sends);
818 atomic_inc(&net_device->queue_sends[q_idx]);
819
820 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
821 netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx));
822
823 if (atomic_read(&net_device->
824 queue_sends[q_idx]) < 1)
825 netif_tx_wake_queue(netdev_get_tx_queue(
826 ndev, q_idx));
827 }
828 } else if (ret == -EAGAIN) {
829 netif_tx_stop_queue(netdev_get_tx_queue(
830 ndev, q_idx));
831 if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
832 netif_tx_wake_queue(netdev_get_tx_queue(
833 ndev, q_idx));
834 ret = -ENOSPC;
835 }
836 } else {
837 netdev_err(ndev, "Unable to send packet %p ret %d\n",
838 packet, ret);
839 }
840
841 return ret;
842}
843
844/* Move packet out of multi send data (msd), and clear msd */
845static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
846 struct sk_buff **msd_skb,
847 struct multi_send_data *msdp)
848{
849 *msd_skb = msdp->skb;
850 *msd_send = msdp->pkt;
851 msdp->skb = NULL;
852 msdp->pkt = NULL;
853 msdp->count = 0;
854}
855
856int netvsc_send(struct hv_device *device,
857 struct hv_netvsc_packet *packet,
858 struct rndis_message *rndis_msg,
859 struct hv_page_buffer **pb,
860 struct sk_buff *skb)
861{
862 struct netvsc_device *net_device;
863 int ret = 0, m_ret = 0;
864 struct vmbus_channel *out_channel;
865 u16 q_idx = packet->q_idx;
866 u32 pktlen = packet->total_data_buflen, msd_len = 0;
867 unsigned int section_index = NETVSC_INVALID_INDEX;
868 struct multi_send_data *msdp;
869 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
870 struct sk_buff *msd_skb = NULL;
871 bool try_batch;
872 bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
873
874 net_device = get_outbound_net_device(device);
875 if (!net_device)
876 return -ENODEV;
877
878 out_channel = net_device->chn_table[q_idx];
879
880 packet->send_buf_index = NETVSC_INVALID_INDEX;
881 packet->cp_partial = false;
882
883 /* Send control message directly without accessing msd (Multi-Send
884 * Data) field which may be changed during data packet processing.
885 */
886 if (!skb) {
887 cur_send = packet;
888 goto send_now;
889 }
890
891 msdp = &net_device->msd[q_idx];
892
893 /* batch packets in send buffer if possible */
894 if (msdp->pkt)
895 msd_len = msdp->pkt->total_data_buflen;
896
897 try_batch = (skb != NULL) && msd_len > 0 && msdp->count <
898 net_device->max_pkt;
899
900 if (try_batch && msd_len + pktlen + net_device->pkt_align <
901 net_device->send_section_size) {
902 section_index = msdp->pkt->send_buf_index;
903
904 } else if (try_batch && msd_len + packet->rmsg_size <
905 net_device->send_section_size) {
906 section_index = msdp->pkt->send_buf_index;
907 packet->cp_partial = true;
908
909 } else if ((skb != NULL) && pktlen + net_device->pkt_align <
910 net_device->send_section_size) {
911 section_index = netvsc_get_next_send_section(net_device);
912 if (section_index != NETVSC_INVALID_INDEX) {
913 move_pkt_msd(&msd_send, &msd_skb, msdp);
914 msd_len = 0;
915 }
916 }
917
918 if (section_index != NETVSC_INVALID_INDEX) {
919 netvsc_copy_to_send_buf(net_device,
920 section_index, msd_len,
921 packet, rndis_msg, pb, skb);
922
923 packet->send_buf_index = section_index;
924
925 if (packet->cp_partial) {
926 packet->page_buf_cnt -= packet->rmsg_pgcnt;
927 packet->total_data_buflen = msd_len + packet->rmsg_size;
928 } else {
929 packet->page_buf_cnt = 0;
930 packet->total_data_buflen += msd_len;
931 }
932
933 if (msdp->skb)
934 dev_kfree_skb_any(msdp->skb);
935
936 if (xmit_more && !packet->cp_partial) {
937 msdp->skb = skb;
938 msdp->pkt = packet;
939 msdp->count++;
940 } else {
941 cur_send = packet;
942 msdp->skb = NULL;
943 msdp->pkt = NULL;
944 msdp->count = 0;
945 }
946 } else {
947 move_pkt_msd(&msd_send, &msd_skb, msdp);
948 cur_send = packet;
949 }
950
951 if (msd_send) {
952 m_ret = netvsc_send_pkt(msd_send, net_device, NULL, msd_skb);
953
954 if (m_ret != 0) {
955 netvsc_free_send_slot(net_device,
956 msd_send->send_buf_index);
957 dev_kfree_skb_any(msd_skb);
958 }
959 }
960
961send_now:
962 if (cur_send)
963 ret = netvsc_send_pkt(cur_send, net_device, pb, skb);
964
965 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
966 netvsc_free_send_slot(net_device, section_index);
967
968 return ret;
969}
970
971static void netvsc_send_recv_completion(struct hv_device *device,
972 struct vmbus_channel *channel,
973 struct netvsc_device *net_device,
974 u64 transaction_id, u32 status)
975{
976 struct nvsp_message recvcompMessage;
977 int retries = 0;
978 int ret;
979 struct net_device *ndev;
980
981 ndev = net_device->ndev;
982
983 recvcompMessage.hdr.msg_type =
984 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
985
986 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
987
988retry_send_cmplt:
989 /* Send the completion */
990 ret = vmbus_sendpacket(channel, &recvcompMessage,
991 sizeof(struct nvsp_message), transaction_id,
992 VM_PKT_COMP, 0);
993 if (ret == 0) {
994 /* success */
995 /* no-op */
996 } else if (ret == -EAGAIN) {
997 /* no more room...wait a bit and attempt to retry 3 times */
998 retries++;
999 netdev_err(ndev, "unable to send receive completion pkt"
1000 " (tid %llx)...retrying %d\n", transaction_id, retries);
1001
1002 if (retries < 4) {
1003 udelay(100);
1004 goto retry_send_cmplt;
1005 } else {
1006 netdev_err(ndev, "unable to send receive "
1007 "completion pkt (tid %llx)...give up retrying\n",
1008 transaction_id);
1009 }
1010 } else {
1011 netdev_err(ndev, "unable to send receive "
1012 "completion pkt - %llx\n", transaction_id);
1013 }
1014}
1015
1016static void netvsc_receive(struct netvsc_device *net_device,
1017 struct vmbus_channel *channel,
1018 struct hv_device *device,
1019 struct vmpacket_descriptor *packet)
1020{
1021 struct vmtransfer_page_packet_header *vmxferpage_packet;
1022 struct nvsp_message *nvsp_packet;
1023 struct hv_netvsc_packet nv_pkt;
1024 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
1025 u32 status = NVSP_STAT_SUCCESS;
1026 int i;
1027 int count = 0;
1028 struct net_device *ndev;
1029 void *data;
1030
1031 ndev = net_device->ndev;
1032
1033 /*
1034 * All inbound packets other than send completion should be xfer page
1035 * packet
1036 */
1037 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
1038 netdev_err(ndev, "Unknown packet type received - %d\n",
1039 packet->type);
1040 return;
1041 }
1042
1043 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
1044 (packet->offset8 << 3));
1045
1046 /* Make sure this is a valid nvsp packet */
1047 if (nvsp_packet->hdr.msg_type !=
1048 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
1049 netdev_err(ndev, "Unknown nvsp packet type received-"
1050 " %d\n", nvsp_packet->hdr.msg_type);
1051 return;
1052 }
1053
1054 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
1055
1056 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
1057 netdev_err(ndev, "Invalid xfer page set id - "
1058 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
1059 vmxferpage_packet->xfer_pageset_id);
1060 return;
1061 }
1062
1063 count = vmxferpage_packet->range_cnt;
1064
1065 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1066 for (i = 0; i < count; i++) {
1067 /* Initialize the netvsc packet */
1068 data = (void *)((unsigned long)net_device->
1069 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
1070 netvsc_packet->total_data_buflen =
1071 vmxferpage_packet->ranges[i].byte_count;
1072
1073 /* Pass it to the upper layer */
1074 status = rndis_filter_receive(device, netvsc_packet, &data,
1075 channel);
1076
1077 }
1078
1079 netvsc_send_recv_completion(device, channel, net_device,
1080 vmxferpage_packet->d.trans_id, status);
1081}
1082
1083
1084static void netvsc_send_table(struct hv_device *hdev,
1085 struct nvsp_message *nvmsg)
1086{
1087 struct netvsc_device *nvscdev;
1088 struct net_device *ndev;
1089 int i;
1090 u32 count, *tab;
1091
1092 nvscdev = get_outbound_net_device(hdev);
1093 if (!nvscdev)
1094 return;
1095 ndev = nvscdev->ndev;
1096
1097 count = nvmsg->msg.v5_msg.send_table.count;
1098 if (count != VRSS_SEND_TAB_SIZE) {
1099 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1100 return;
1101 }
1102
1103 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
1104 nvmsg->msg.v5_msg.send_table.offset);
1105
1106 for (i = 0; i < count; i++)
1107 nvscdev->send_table[i] = tab[i];
1108}
1109
1110static void netvsc_send_vf(struct netvsc_device *nvdev,
1111 struct nvsp_message *nvmsg)
1112{
1113 nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1114 nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1115}
1116
1117static inline void netvsc_receive_inband(struct hv_device *hdev,
1118 struct netvsc_device *nvdev,
1119 struct nvsp_message *nvmsg)
1120{
1121 switch (nvmsg->hdr.msg_type) {
1122 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1123 netvsc_send_table(hdev, nvmsg);
1124 break;
1125
1126 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1127 netvsc_send_vf(nvdev, nvmsg);
1128 break;
1129 }
1130}
1131
1132void netvsc_channel_cb(void *context)
1133{
1134 int ret;
1135 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1136 struct hv_device *device;
1137 struct netvsc_device *net_device;
1138 u32 bytes_recvd;
1139 u64 request_id;
1140 struct vmpacket_descriptor *desc;
1141 unsigned char *buffer;
1142 int bufferlen = NETVSC_PACKET_SIZE;
1143 struct net_device *ndev;
1144 struct nvsp_message *nvmsg;
1145
1146 if (channel->primary_channel != NULL)
1147 device = channel->primary_channel->device_obj;
1148 else
1149 device = channel->device_obj;
1150
1151 net_device = get_inbound_net_device(device);
1152 if (!net_device)
1153 return;
1154 ndev = net_device->ndev;
1155 buffer = get_per_channel_state(channel);
1156
1157 do {
1158 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
1159 &bytes_recvd, &request_id);
1160 if (ret == 0) {
1161 if (bytes_recvd > 0) {
1162 desc = (struct vmpacket_descriptor *)buffer;
1163 nvmsg = (struct nvsp_message *)((unsigned long)
1164 desc + (desc->offset8 << 3));
1165 switch (desc->type) {
1166 case VM_PKT_COMP:
1167 netvsc_send_completion(net_device,
1168 channel,
1169 device, desc);
1170 break;
1171
1172 case VM_PKT_DATA_USING_XFER_PAGES:
1173 netvsc_receive(net_device, channel,
1174 device, desc);
1175 break;
1176
1177 case VM_PKT_DATA_INBAND:
1178 netvsc_receive_inband(device,
1179 net_device,
1180 nvmsg);
1181 break;
1182
1183 default:
1184 netdev_err(ndev,
1185 "unhandled packet type %d, "
1186 "tid %llx len %d\n",
1187 desc->type, request_id,
1188 bytes_recvd);
1189 break;
1190 }
1191
1192 } else {
1193 /*
1194 * We are done for this pass.
1195 */
1196 break;
1197 }
1198
1199 } else if (ret == -ENOBUFS) {
1200 if (bufferlen > NETVSC_PACKET_SIZE)
1201 kfree(buffer);
1202 /* Handle large packet */
1203 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1204 if (buffer == NULL) {
1205 /* Try again next time around */
1206 netdev_err(ndev,
1207 "unable to allocate buffer of size "
1208 "(%d)!!\n", bytes_recvd);
1209 break;
1210 }
1211
1212 bufferlen = bytes_recvd;
1213 }
1214 } while (1);
1215
1216 if (bufferlen > NETVSC_PACKET_SIZE)
1217 kfree(buffer);
1218 return;
1219}
1220
1221/*
1222 * netvsc_device_add - Callback when the device belonging to this
1223 * driver is added
1224 */
1225int netvsc_device_add(struct hv_device *device, void *additional_info)
1226{
1227 int ret = 0;
1228 int ring_size =
1229 ((struct netvsc_device_info *)additional_info)->ring_size;
1230 struct netvsc_device *net_device;
1231 struct net_device *ndev;
1232
1233 net_device = alloc_net_device(device);
1234 if (!net_device)
1235 return -ENOMEM;
1236
1237 net_device->ring_size = ring_size;
1238
1239 /*
1240 * Coming into this function, struct net_device * is
1241 * registered as the driver private data.
1242 * In alloc_net_device(), we register struct netvsc_device *
1243 * as the driver private data and stash away struct net_device *
1244 * in struct netvsc_device *.
1245 */
1246 ndev = net_device->ndev;
1247
1248 /* Add netvsc_device context to netvsc_device */
1249 net_device->nd_ctx = netdev_priv(ndev);
1250
1251 /* Initialize the NetVSC channel extension */
1252 init_completion(&net_device->channel_init_wait);
1253
1254 set_per_channel_state(device->channel, net_device->cb_buffer);
1255
1256 /* Open the channel */
1257 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1258 ring_size * PAGE_SIZE, NULL, 0,
1259 netvsc_channel_cb, device->channel);
1260
1261 if (ret != 0) {
1262 netdev_err(ndev, "unable to open channel: %d\n", ret);
1263 goto cleanup;
1264 }
1265
1266 /* Channel is opened */
1267 pr_info("hv_netvsc channel opened successfully\n");
1268
1269 net_device->chn_table[0] = device->channel;
1270
1271 /* Connect with the NetVsp */
1272 ret = netvsc_connect_vsp(device);
1273 if (ret != 0) {
1274 netdev_err(ndev,
1275 "unable to connect to NetVSP - %d\n", ret);
1276 goto close;
1277 }
1278
1279 return ret;
1280
1281close:
1282 /* Now, we can close the channel safely */
1283 vmbus_close(device->channel);
1284
1285cleanup:
1286 free_netvsc_device(net_device);
1287
1288 return ret;
1289}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2009, Microsoft Corporation.
4 *
5 * Authors:
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
8 */
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/wait.h>
14#include <linux/mm.h>
15#include <linux/delay.h>
16#include <linux/io.h>
17#include <linux/slab.h>
18#include <linux/netdevice.h>
19#include <linux/if_ether.h>
20#include <linux/vmalloc.h>
21#include <linux/rtnetlink.h>
22#include <linux/prefetch.h>
23
24#include <asm/sync_bitops.h>
25
26#include "hyperv_net.h"
27#include "netvsc_trace.h"
28
29/*
30 * Switch the data path from the synthetic interface to the VF
31 * interface.
32 */
33void netvsc_switch_datapath(struct net_device *ndev, bool vf)
34{
35 struct net_device_context *net_device_ctx = netdev_priv(ndev);
36 struct hv_device *dev = net_device_ctx->device_ctx;
37 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
38 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
39
40 memset(init_pkt, 0, sizeof(struct nvsp_message));
41 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
42 if (vf)
43 init_pkt->msg.v4_msg.active_dp.active_datapath =
44 NVSP_DATAPATH_VF;
45 else
46 init_pkt->msg.v4_msg.active_dp.active_datapath =
47 NVSP_DATAPATH_SYNTHETIC;
48
49 trace_nvsp_send(ndev, init_pkt);
50
51 vmbus_sendpacket(dev->channel, init_pkt,
52 sizeof(struct nvsp_message),
53 (unsigned long)init_pkt,
54 VM_PKT_DATA_INBAND, 0);
55}
56
57/* Worker to setup sub channels on initial setup
58 * Initial hotplug event occurs in softirq context
59 * and can't wait for channels.
60 */
61static void netvsc_subchan_work(struct work_struct *w)
62{
63 struct netvsc_device *nvdev =
64 container_of(w, struct netvsc_device, subchan_work);
65 struct rndis_device *rdev;
66 int i, ret;
67
68 /* Avoid deadlock with device removal already under RTNL */
69 if (!rtnl_trylock()) {
70 schedule_work(w);
71 return;
72 }
73
74 rdev = nvdev->extension;
75 if (rdev) {
76 ret = rndis_set_subchannel(rdev->ndev, nvdev, NULL);
77 if (ret == 0) {
78 netif_device_attach(rdev->ndev);
79 } else {
80 /* fallback to only primary channel */
81 for (i = 1; i < nvdev->num_chn; i++)
82 netif_napi_del(&nvdev->chan_table[i].napi);
83
84 nvdev->max_chn = 1;
85 nvdev->num_chn = 1;
86 }
87 }
88
89 rtnl_unlock();
90}
91
92static struct netvsc_device *alloc_net_device(void)
93{
94 struct netvsc_device *net_device;
95
96 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
97 if (!net_device)
98 return NULL;
99
100 init_waitqueue_head(&net_device->wait_drain);
101 net_device->destroy = false;
102 net_device->tx_disable = false;
103
104 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
105 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
106
107 init_completion(&net_device->channel_init_wait);
108 init_waitqueue_head(&net_device->subchan_open);
109 INIT_WORK(&net_device->subchan_work, netvsc_subchan_work);
110
111 return net_device;
112}
113
114static void free_netvsc_device(struct rcu_head *head)
115{
116 struct netvsc_device *nvdev
117 = container_of(head, struct netvsc_device, rcu);
118 int i;
119
120 kfree(nvdev->extension);
121 vfree(nvdev->recv_buf);
122 vfree(nvdev->send_buf);
123 kfree(nvdev->send_section_map);
124
125 for (i = 0; i < VRSS_CHANNEL_MAX; i++)
126 vfree(nvdev->chan_table[i].mrc.slots);
127
128 kfree(nvdev);
129}
130
131static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
132{
133 call_rcu(&nvdev->rcu, free_netvsc_device);
134}
135
136static void netvsc_revoke_recv_buf(struct hv_device *device,
137 struct netvsc_device *net_device,
138 struct net_device *ndev)
139{
140 struct nvsp_message *revoke_packet;
141 int ret;
142
143 /*
144 * If we got a section count, it means we received a
145 * SendReceiveBufferComplete msg (ie sent
146 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
147 * to send a revoke msg here
148 */
149 if (net_device->recv_section_cnt) {
150 /* Send the revoke receive buffer */
151 revoke_packet = &net_device->revoke_packet;
152 memset(revoke_packet, 0, sizeof(struct nvsp_message));
153
154 revoke_packet->hdr.msg_type =
155 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
156 revoke_packet->msg.v1_msg.
157 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
158
159 trace_nvsp_send(ndev, revoke_packet);
160
161 ret = vmbus_sendpacket(device->channel,
162 revoke_packet,
163 sizeof(struct nvsp_message),
164 (unsigned long)revoke_packet,
165 VM_PKT_DATA_INBAND, 0);
166 /* If the failure is because the channel is rescinded;
167 * ignore the failure since we cannot send on a rescinded
168 * channel. This would allow us to properly cleanup
169 * even when the channel is rescinded.
170 */
171 if (device->channel->rescind)
172 ret = 0;
173 /*
174 * If we failed here, we might as well return and
175 * have a leak rather than continue and a bugchk
176 */
177 if (ret != 0) {
178 netdev_err(ndev, "unable to send "
179 "revoke receive buffer to netvsp\n");
180 return;
181 }
182 net_device->recv_section_cnt = 0;
183 }
184}
185
186static void netvsc_revoke_send_buf(struct hv_device *device,
187 struct netvsc_device *net_device,
188 struct net_device *ndev)
189{
190 struct nvsp_message *revoke_packet;
191 int ret;
192
193 /* Deal with the send buffer we may have setup.
194 * If we got a send section size, it means we received a
195 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
196 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
197 * to send a revoke msg here
198 */
199 if (net_device->send_section_cnt) {
200 /* Send the revoke receive buffer */
201 revoke_packet = &net_device->revoke_packet;
202 memset(revoke_packet, 0, sizeof(struct nvsp_message));
203
204 revoke_packet->hdr.msg_type =
205 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
206 revoke_packet->msg.v1_msg.revoke_send_buf.id =
207 NETVSC_SEND_BUFFER_ID;
208
209 trace_nvsp_send(ndev, revoke_packet);
210
211 ret = vmbus_sendpacket(device->channel,
212 revoke_packet,
213 sizeof(struct nvsp_message),
214 (unsigned long)revoke_packet,
215 VM_PKT_DATA_INBAND, 0);
216
217 /* If the failure is because the channel is rescinded;
218 * ignore the failure since we cannot send on a rescinded
219 * channel. This would allow us to properly cleanup
220 * even when the channel is rescinded.
221 */
222 if (device->channel->rescind)
223 ret = 0;
224
225 /* If we failed here, we might as well return and
226 * have a leak rather than continue and a bugchk
227 */
228 if (ret != 0) {
229 netdev_err(ndev, "unable to send "
230 "revoke send buffer to netvsp\n");
231 return;
232 }
233 net_device->send_section_cnt = 0;
234 }
235}
236
237static void netvsc_teardown_recv_gpadl(struct hv_device *device,
238 struct netvsc_device *net_device,
239 struct net_device *ndev)
240{
241 int ret;
242
243 if (net_device->recv_buf_gpadl_handle) {
244 ret = vmbus_teardown_gpadl(device->channel,
245 net_device->recv_buf_gpadl_handle);
246
247 /* If we failed here, we might as well return and have a leak
248 * rather than continue and a bugchk
249 */
250 if (ret != 0) {
251 netdev_err(ndev,
252 "unable to teardown receive buffer's gpadl\n");
253 return;
254 }
255 net_device->recv_buf_gpadl_handle = 0;
256 }
257}
258
259static void netvsc_teardown_send_gpadl(struct hv_device *device,
260 struct netvsc_device *net_device,
261 struct net_device *ndev)
262{
263 int ret;
264
265 if (net_device->send_buf_gpadl_handle) {
266 ret = vmbus_teardown_gpadl(device->channel,
267 net_device->send_buf_gpadl_handle);
268
269 /* If we failed here, we might as well return and have a leak
270 * rather than continue and a bugchk
271 */
272 if (ret != 0) {
273 netdev_err(ndev,
274 "unable to teardown send buffer's gpadl\n");
275 return;
276 }
277 net_device->send_buf_gpadl_handle = 0;
278 }
279}
280
281int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
282{
283 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
284 int node = cpu_to_node(nvchan->channel->target_cpu);
285 size_t size;
286
287 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
288 nvchan->mrc.slots = vzalloc_node(size, node);
289 if (!nvchan->mrc.slots)
290 nvchan->mrc.slots = vzalloc(size);
291
292 return nvchan->mrc.slots ? 0 : -ENOMEM;
293}
294
295static int netvsc_init_buf(struct hv_device *device,
296 struct netvsc_device *net_device,
297 const struct netvsc_device_info *device_info)
298{
299 struct nvsp_1_message_send_receive_buffer_complete *resp;
300 struct net_device *ndev = hv_get_drvdata(device);
301 struct nvsp_message *init_packet;
302 unsigned int buf_size;
303 size_t map_words;
304 int ret = 0;
305
306 /* Get receive buffer area. */
307 buf_size = device_info->recv_sections * device_info->recv_section_size;
308 buf_size = roundup(buf_size, PAGE_SIZE);
309
310 /* Legacy hosts only allow smaller receive buffer */
311 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
312 buf_size = min_t(unsigned int, buf_size,
313 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
314
315 net_device->recv_buf = vzalloc(buf_size);
316 if (!net_device->recv_buf) {
317 netdev_err(ndev,
318 "unable to allocate receive buffer of size %u\n",
319 buf_size);
320 ret = -ENOMEM;
321 goto cleanup;
322 }
323
324 net_device->recv_buf_size = buf_size;
325
326 /*
327 * Establish the gpadl handle for this buffer on this
328 * channel. Note: This call uses the vmbus connection rather
329 * than the channel to establish the gpadl handle.
330 */
331 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
332 buf_size,
333 &net_device->recv_buf_gpadl_handle);
334 if (ret != 0) {
335 netdev_err(ndev,
336 "unable to establish receive buffer's gpadl\n");
337 goto cleanup;
338 }
339
340 /* Notify the NetVsp of the gpadl handle */
341 init_packet = &net_device->channel_init_pkt;
342 memset(init_packet, 0, sizeof(struct nvsp_message));
343 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
344 init_packet->msg.v1_msg.send_recv_buf.
345 gpadl_handle = net_device->recv_buf_gpadl_handle;
346 init_packet->msg.v1_msg.
347 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
348
349 trace_nvsp_send(ndev, init_packet);
350
351 /* Send the gpadl notification request */
352 ret = vmbus_sendpacket(device->channel, init_packet,
353 sizeof(struct nvsp_message),
354 (unsigned long)init_packet,
355 VM_PKT_DATA_INBAND,
356 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
357 if (ret != 0) {
358 netdev_err(ndev,
359 "unable to send receive buffer's gpadl to netvsp\n");
360 goto cleanup;
361 }
362
363 wait_for_completion(&net_device->channel_init_wait);
364
365 /* Check the response */
366 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
367 if (resp->status != NVSP_STAT_SUCCESS) {
368 netdev_err(ndev,
369 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
370 resp->status);
371 ret = -EINVAL;
372 goto cleanup;
373 }
374
375 /* Parse the response */
376 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
377 resp->num_sections, resp->sections[0].sub_alloc_size,
378 resp->sections[0].num_sub_allocs);
379
380 /* There should only be one section for the entire receive buffer */
381 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
382 ret = -EINVAL;
383 goto cleanup;
384 }
385
386 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
387 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
388
389 /* Setup receive completion ring */
390 net_device->recv_completion_cnt
391 = round_up(net_device->recv_section_cnt + 1,
392 PAGE_SIZE / sizeof(u64));
393 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
394 if (ret)
395 goto cleanup;
396
397 /* Now setup the send buffer. */
398 buf_size = device_info->send_sections * device_info->send_section_size;
399 buf_size = round_up(buf_size, PAGE_SIZE);
400
401 net_device->send_buf = vzalloc(buf_size);
402 if (!net_device->send_buf) {
403 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
404 buf_size);
405 ret = -ENOMEM;
406 goto cleanup;
407 }
408
409 /* Establish the gpadl handle for this buffer on this
410 * channel. Note: This call uses the vmbus connection rather
411 * than the channel to establish the gpadl handle.
412 */
413 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
414 buf_size,
415 &net_device->send_buf_gpadl_handle);
416 if (ret != 0) {
417 netdev_err(ndev,
418 "unable to establish send buffer's gpadl\n");
419 goto cleanup;
420 }
421
422 /* Notify the NetVsp of the gpadl handle */
423 init_packet = &net_device->channel_init_pkt;
424 memset(init_packet, 0, sizeof(struct nvsp_message));
425 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
426 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
427 net_device->send_buf_gpadl_handle;
428 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
429
430 trace_nvsp_send(ndev, init_packet);
431
432 /* Send the gpadl notification request */
433 ret = vmbus_sendpacket(device->channel, init_packet,
434 sizeof(struct nvsp_message),
435 (unsigned long)init_packet,
436 VM_PKT_DATA_INBAND,
437 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
438 if (ret != 0) {
439 netdev_err(ndev,
440 "unable to send send buffer's gpadl to netvsp\n");
441 goto cleanup;
442 }
443
444 wait_for_completion(&net_device->channel_init_wait);
445
446 /* Check the response */
447 if (init_packet->msg.v1_msg.
448 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
449 netdev_err(ndev, "Unable to complete send buffer "
450 "initialization with NetVsp - status %d\n",
451 init_packet->msg.v1_msg.
452 send_send_buf_complete.status);
453 ret = -EINVAL;
454 goto cleanup;
455 }
456
457 /* Parse the response */
458 net_device->send_section_size = init_packet->msg.
459 v1_msg.send_send_buf_complete.section_size;
460
461 /* Section count is simply the size divided by the section size. */
462 net_device->send_section_cnt = buf_size / net_device->send_section_size;
463
464 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
465 net_device->send_section_size, net_device->send_section_cnt);
466
467 /* Setup state for managing the send buffer. */
468 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
469
470 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
471 if (net_device->send_section_map == NULL) {
472 ret = -ENOMEM;
473 goto cleanup;
474 }
475
476 goto exit;
477
478cleanup:
479 netvsc_revoke_recv_buf(device, net_device, ndev);
480 netvsc_revoke_send_buf(device, net_device, ndev);
481 netvsc_teardown_recv_gpadl(device, net_device, ndev);
482 netvsc_teardown_send_gpadl(device, net_device, ndev);
483
484exit:
485 return ret;
486}
487
488/* Negotiate NVSP protocol version */
489static int negotiate_nvsp_ver(struct hv_device *device,
490 struct netvsc_device *net_device,
491 struct nvsp_message *init_packet,
492 u32 nvsp_ver)
493{
494 struct net_device *ndev = hv_get_drvdata(device);
495 int ret;
496
497 memset(init_packet, 0, sizeof(struct nvsp_message));
498 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
499 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
500 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
501 trace_nvsp_send(ndev, init_packet);
502
503 /* Send the init request */
504 ret = vmbus_sendpacket(device->channel, init_packet,
505 sizeof(struct nvsp_message),
506 (unsigned long)init_packet,
507 VM_PKT_DATA_INBAND,
508 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
509
510 if (ret != 0)
511 return ret;
512
513 wait_for_completion(&net_device->channel_init_wait);
514
515 if (init_packet->msg.init_msg.init_complete.status !=
516 NVSP_STAT_SUCCESS)
517 return -EINVAL;
518
519 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
520 return 0;
521
522 /* NVSPv2 or later: Send NDIS config */
523 memset(init_packet, 0, sizeof(struct nvsp_message));
524 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
525 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
526 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
527
528 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
529 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
530
531 /* Teaming bit is needed to receive link speed updates */
532 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
533 }
534
535 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_61)
536 init_packet->msg.v2_msg.send_ndis_config.capability.rsc = 1;
537
538 trace_nvsp_send(ndev, init_packet);
539
540 ret = vmbus_sendpacket(device->channel, init_packet,
541 sizeof(struct nvsp_message),
542 (unsigned long)init_packet,
543 VM_PKT_DATA_INBAND, 0);
544
545 return ret;
546}
547
548static int netvsc_connect_vsp(struct hv_device *device,
549 struct netvsc_device *net_device,
550 const struct netvsc_device_info *device_info)
551{
552 struct net_device *ndev = hv_get_drvdata(device);
553 static const u32 ver_list[] = {
554 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
555 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5,
556 NVSP_PROTOCOL_VERSION_6, NVSP_PROTOCOL_VERSION_61
557 };
558 struct nvsp_message *init_packet;
559 int ndis_version, i, ret;
560
561 init_packet = &net_device->channel_init_pkt;
562
563 /* Negotiate the latest NVSP protocol supported */
564 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
565 if (negotiate_nvsp_ver(device, net_device, init_packet,
566 ver_list[i]) == 0) {
567 net_device->nvsp_version = ver_list[i];
568 break;
569 }
570
571 if (i < 0) {
572 ret = -EPROTO;
573 goto cleanup;
574 }
575
576 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
577
578 /* Send the ndis version */
579 memset(init_packet, 0, sizeof(struct nvsp_message));
580
581 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
582 ndis_version = 0x00060001;
583 else
584 ndis_version = 0x0006001e;
585
586 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
587 init_packet->msg.v1_msg.
588 send_ndis_ver.ndis_major_ver =
589 (ndis_version & 0xFFFF0000) >> 16;
590 init_packet->msg.v1_msg.
591 send_ndis_ver.ndis_minor_ver =
592 ndis_version & 0xFFFF;
593
594 trace_nvsp_send(ndev, init_packet);
595
596 /* Send the init request */
597 ret = vmbus_sendpacket(device->channel, init_packet,
598 sizeof(struct nvsp_message),
599 (unsigned long)init_packet,
600 VM_PKT_DATA_INBAND, 0);
601 if (ret != 0)
602 goto cleanup;
603
604
605 ret = netvsc_init_buf(device, net_device, device_info);
606
607cleanup:
608 return ret;
609}
610
611/*
612 * netvsc_device_remove - Callback when the root bus device is removed
613 */
614void netvsc_device_remove(struct hv_device *device)
615{
616 struct net_device *ndev = hv_get_drvdata(device);
617 struct net_device_context *net_device_ctx = netdev_priv(ndev);
618 struct netvsc_device *net_device
619 = rtnl_dereference(net_device_ctx->nvdev);
620 int i;
621
622 /*
623 * Revoke receive buffer. If host is pre-Win2016 then tear down
624 * receive buffer GPADL. Do the same for send buffer.
625 */
626 netvsc_revoke_recv_buf(device, net_device, ndev);
627 if (vmbus_proto_version < VERSION_WIN10)
628 netvsc_teardown_recv_gpadl(device, net_device, ndev);
629
630 netvsc_revoke_send_buf(device, net_device, ndev);
631 if (vmbus_proto_version < VERSION_WIN10)
632 netvsc_teardown_send_gpadl(device, net_device, ndev);
633
634 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
635
636 /* And disassociate NAPI context from device */
637 for (i = 0; i < net_device->num_chn; i++)
638 netif_napi_del(&net_device->chan_table[i].napi);
639
640 /*
641 * At this point, no one should be accessing net_device
642 * except in here
643 */
644 netdev_dbg(ndev, "net device safe to remove\n");
645
646 /* Now, we can close the channel safely */
647 vmbus_close(device->channel);
648
649 /*
650 * If host is Win2016 or higher then we do the GPADL tear down
651 * here after VMBus is closed.
652 */
653 if (vmbus_proto_version >= VERSION_WIN10) {
654 netvsc_teardown_recv_gpadl(device, net_device, ndev);
655 netvsc_teardown_send_gpadl(device, net_device, ndev);
656 }
657
658 /* Release all resources */
659 free_netvsc_device_rcu(net_device);
660}
661
662#define RING_AVAIL_PERCENT_HIWATER 20
663#define RING_AVAIL_PERCENT_LOWATER 10
664
665static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
666 u32 index)
667{
668 sync_change_bit(index, net_device->send_section_map);
669}
670
671static void netvsc_send_tx_complete(struct net_device *ndev,
672 struct netvsc_device *net_device,
673 struct vmbus_channel *channel,
674 const struct vmpacket_descriptor *desc,
675 int budget)
676{
677 struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
678 struct net_device_context *ndev_ctx = netdev_priv(ndev);
679 u16 q_idx = 0;
680 int queue_sends;
681
682 /* Notify the layer above us */
683 if (likely(skb)) {
684 const struct hv_netvsc_packet *packet
685 = (struct hv_netvsc_packet *)skb->cb;
686 u32 send_index = packet->send_buf_index;
687 struct netvsc_stats *tx_stats;
688
689 if (send_index != NETVSC_INVALID_INDEX)
690 netvsc_free_send_slot(net_device, send_index);
691 q_idx = packet->q_idx;
692
693 tx_stats = &net_device->chan_table[q_idx].tx_stats;
694
695 u64_stats_update_begin(&tx_stats->syncp);
696 tx_stats->packets += packet->total_packets;
697 tx_stats->bytes += packet->total_bytes;
698 u64_stats_update_end(&tx_stats->syncp);
699
700 napi_consume_skb(skb, budget);
701 }
702
703 queue_sends =
704 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
705
706 if (unlikely(net_device->destroy)) {
707 if (queue_sends == 0)
708 wake_up(&net_device->wait_drain);
709 } else {
710 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
711
712 if (netif_tx_queue_stopped(txq) && !net_device->tx_disable &&
713 (hv_get_avail_to_write_percent(&channel->outbound) >
714 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) {
715 netif_tx_wake_queue(txq);
716 ndev_ctx->eth_stats.wake_queue++;
717 }
718 }
719}
720
721static void netvsc_send_completion(struct net_device *ndev,
722 struct netvsc_device *net_device,
723 struct vmbus_channel *incoming_channel,
724 const struct vmpacket_descriptor *desc,
725 int budget)
726{
727 const struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
728
729 switch (nvsp_packet->hdr.msg_type) {
730 case NVSP_MSG_TYPE_INIT_COMPLETE:
731 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
732 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
733 case NVSP_MSG5_TYPE_SUBCHANNEL:
734 /* Copy the response back */
735 memcpy(&net_device->channel_init_pkt, nvsp_packet,
736 sizeof(struct nvsp_message));
737 complete(&net_device->channel_init_wait);
738 break;
739
740 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
741 netvsc_send_tx_complete(ndev, net_device, incoming_channel,
742 desc, budget);
743 break;
744
745 default:
746 netdev_err(ndev,
747 "Unknown send completion type %d received!!\n",
748 nvsp_packet->hdr.msg_type);
749 }
750}
751
752static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
753{
754 unsigned long *map_addr = net_device->send_section_map;
755 unsigned int i;
756
757 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
758 if (sync_test_and_set_bit(i, map_addr) == 0)
759 return i;
760 }
761
762 return NETVSC_INVALID_INDEX;
763}
764
765static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
766 unsigned int section_index,
767 u32 pend_size,
768 struct hv_netvsc_packet *packet,
769 struct rndis_message *rndis_msg,
770 struct hv_page_buffer *pb,
771 bool xmit_more)
772{
773 char *start = net_device->send_buf;
774 char *dest = start + (section_index * net_device->send_section_size)
775 + pend_size;
776 int i;
777 u32 padding = 0;
778 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
779 packet->page_buf_cnt;
780 u32 remain;
781
782 /* Add padding */
783 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
784 if (xmit_more && remain) {
785 padding = net_device->pkt_align - remain;
786 rndis_msg->msg_len += padding;
787 packet->total_data_buflen += padding;
788 }
789
790 for (i = 0; i < page_count; i++) {
791 char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT);
792 u32 offset = pb[i].offset;
793 u32 len = pb[i].len;
794
795 memcpy(dest, (src + offset), len);
796 dest += len;
797 }
798
799 if (padding)
800 memset(dest, 0, padding);
801}
802
803static inline int netvsc_send_pkt(
804 struct hv_device *device,
805 struct hv_netvsc_packet *packet,
806 struct netvsc_device *net_device,
807 struct hv_page_buffer *pb,
808 struct sk_buff *skb)
809{
810 struct nvsp_message nvmsg;
811 struct nvsp_1_message_send_rndis_packet *rpkt =
812 &nvmsg.msg.v1_msg.send_rndis_pkt;
813 struct netvsc_channel * const nvchan =
814 &net_device->chan_table[packet->q_idx];
815 struct vmbus_channel *out_channel = nvchan->channel;
816 struct net_device *ndev = hv_get_drvdata(device);
817 struct net_device_context *ndev_ctx = netdev_priv(ndev);
818 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
819 u64 req_id;
820 int ret;
821 u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);
822
823 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
824 if (skb)
825 rpkt->channel_type = 0; /* 0 is RMC_DATA */
826 else
827 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
828
829 rpkt->send_buf_section_index = packet->send_buf_index;
830 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
831 rpkt->send_buf_section_size = 0;
832 else
833 rpkt->send_buf_section_size = packet->total_data_buflen;
834
835 req_id = (ulong)skb;
836
837 if (out_channel->rescind)
838 return -ENODEV;
839
840 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
841
842 if (packet->page_buf_cnt) {
843 if (packet->cp_partial)
844 pb += packet->rmsg_pgcnt;
845
846 ret = vmbus_sendpacket_pagebuffer(out_channel,
847 pb, packet->page_buf_cnt,
848 &nvmsg, sizeof(nvmsg),
849 req_id);
850 } else {
851 ret = vmbus_sendpacket(out_channel,
852 &nvmsg, sizeof(nvmsg),
853 req_id, VM_PKT_DATA_INBAND,
854 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
855 }
856
857 if (ret == 0) {
858 atomic_inc_return(&nvchan->queue_sends);
859
860 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
861 netif_tx_stop_queue(txq);
862 ndev_ctx->eth_stats.stop_queue++;
863 }
864 } else if (ret == -EAGAIN) {
865 netif_tx_stop_queue(txq);
866 ndev_ctx->eth_stats.stop_queue++;
867 } else {
868 netdev_err(ndev,
869 "Unable to send packet pages %u len %u, ret %d\n",
870 packet->page_buf_cnt, packet->total_data_buflen,
871 ret);
872 }
873
874 if (netif_tx_queue_stopped(txq) &&
875 atomic_read(&nvchan->queue_sends) < 1 &&
876 !net_device->tx_disable) {
877 netif_tx_wake_queue(txq);
878 ndev_ctx->eth_stats.wake_queue++;
879 if (ret == -EAGAIN)
880 ret = -ENOSPC;
881 }
882
883 return ret;
884}
885
886/* Move packet out of multi send data (msd), and clear msd */
887static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
888 struct sk_buff **msd_skb,
889 struct multi_send_data *msdp)
890{
891 *msd_skb = msdp->skb;
892 *msd_send = msdp->pkt;
893 msdp->skb = NULL;
894 msdp->pkt = NULL;
895 msdp->count = 0;
896}
897
898/* RCU already held by caller */
899int netvsc_send(struct net_device *ndev,
900 struct hv_netvsc_packet *packet,
901 struct rndis_message *rndis_msg,
902 struct hv_page_buffer *pb,
903 struct sk_buff *skb)
904{
905 struct net_device_context *ndev_ctx = netdev_priv(ndev);
906 struct netvsc_device *net_device
907 = rcu_dereference_bh(ndev_ctx->nvdev);
908 struct hv_device *device = ndev_ctx->device_ctx;
909 int ret = 0;
910 struct netvsc_channel *nvchan;
911 u32 pktlen = packet->total_data_buflen, msd_len = 0;
912 unsigned int section_index = NETVSC_INVALID_INDEX;
913 struct multi_send_data *msdp;
914 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
915 struct sk_buff *msd_skb = NULL;
916 bool try_batch, xmit_more;
917
918 /* If device is rescinded, return error and packet will get dropped. */
919 if (unlikely(!net_device || net_device->destroy))
920 return -ENODEV;
921
922 nvchan = &net_device->chan_table[packet->q_idx];
923 packet->send_buf_index = NETVSC_INVALID_INDEX;
924 packet->cp_partial = false;
925
926 /* Send control message directly without accessing msd (Multi-Send
927 * Data) field which may be changed during data packet processing.
928 */
929 if (!skb)
930 return netvsc_send_pkt(device, packet, net_device, pb, skb);
931
932 /* batch packets in send buffer if possible */
933 msdp = &nvchan->msd;
934 if (msdp->pkt)
935 msd_len = msdp->pkt->total_data_buflen;
936
937 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
938 if (try_batch && msd_len + pktlen + net_device->pkt_align <
939 net_device->send_section_size) {
940 section_index = msdp->pkt->send_buf_index;
941
942 } else if (try_batch && msd_len + packet->rmsg_size <
943 net_device->send_section_size) {
944 section_index = msdp->pkt->send_buf_index;
945 packet->cp_partial = true;
946
947 } else if (pktlen + net_device->pkt_align <
948 net_device->send_section_size) {
949 section_index = netvsc_get_next_send_section(net_device);
950 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
951 ++ndev_ctx->eth_stats.tx_send_full;
952 } else {
953 move_pkt_msd(&msd_send, &msd_skb, msdp);
954 msd_len = 0;
955 }
956 }
957
958 /* Keep aggregating only if stack says more data is coming
959 * and not doing mixed modes send and not flow blocked
960 */
961 xmit_more = netdev_xmit_more() &&
962 !packet->cp_partial &&
963 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
964
965 if (section_index != NETVSC_INVALID_INDEX) {
966 netvsc_copy_to_send_buf(net_device,
967 section_index, msd_len,
968 packet, rndis_msg, pb, xmit_more);
969
970 packet->send_buf_index = section_index;
971
972 if (packet->cp_partial) {
973 packet->page_buf_cnt -= packet->rmsg_pgcnt;
974 packet->total_data_buflen = msd_len + packet->rmsg_size;
975 } else {
976 packet->page_buf_cnt = 0;
977 packet->total_data_buflen += msd_len;
978 }
979
980 if (msdp->pkt) {
981 packet->total_packets += msdp->pkt->total_packets;
982 packet->total_bytes += msdp->pkt->total_bytes;
983 }
984
985 if (msdp->skb)
986 dev_consume_skb_any(msdp->skb);
987
988 if (xmit_more) {
989 msdp->skb = skb;
990 msdp->pkt = packet;
991 msdp->count++;
992 } else {
993 cur_send = packet;
994 msdp->skb = NULL;
995 msdp->pkt = NULL;
996 msdp->count = 0;
997 }
998 } else {
999 move_pkt_msd(&msd_send, &msd_skb, msdp);
1000 cur_send = packet;
1001 }
1002
1003 if (msd_send) {
1004 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
1005 NULL, msd_skb);
1006
1007 if (m_ret != 0) {
1008 netvsc_free_send_slot(net_device,
1009 msd_send->send_buf_index);
1010 dev_kfree_skb_any(msd_skb);
1011 }
1012 }
1013
1014 if (cur_send)
1015 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
1016
1017 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1018 netvsc_free_send_slot(net_device, section_index);
1019
1020 return ret;
1021}
1022
1023/* Send pending recv completions */
1024static int send_recv_completions(struct net_device *ndev,
1025 struct netvsc_device *nvdev,
1026 struct netvsc_channel *nvchan)
1027{
1028 struct multi_recv_comp *mrc = &nvchan->mrc;
1029 struct recv_comp_msg {
1030 struct nvsp_message_header hdr;
1031 u32 status;
1032 } __packed;
1033 struct recv_comp_msg msg = {
1034 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1035 };
1036 int ret;
1037
1038 while (mrc->first != mrc->next) {
1039 const struct recv_comp_data *rcd
1040 = mrc->slots + mrc->first;
1041
1042 msg.status = rcd->status;
1043 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1044 rcd->tid, VM_PKT_COMP, 0);
1045 if (unlikely(ret)) {
1046 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1047
1048 ++ndev_ctx->eth_stats.rx_comp_busy;
1049 return ret;
1050 }
1051
1052 if (++mrc->first == nvdev->recv_completion_cnt)
1053 mrc->first = 0;
1054 }
1055
1056 /* receive completion ring has been emptied */
1057 if (unlikely(nvdev->destroy))
1058 wake_up(&nvdev->wait_drain);
1059
1060 return 0;
1061}
1062
1063/* Count how many receive completions are outstanding */
1064static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1065 const struct multi_recv_comp *mrc,
1066 u32 *filled, u32 *avail)
1067{
1068 u32 count = nvdev->recv_completion_cnt;
1069
1070 if (mrc->next >= mrc->first)
1071 *filled = mrc->next - mrc->first;
1072 else
1073 *filled = (count - mrc->first) + mrc->next;
1074
1075 *avail = count - *filled - 1;
1076}
1077
1078/* Add receive complete to ring to send to host. */
1079static void enq_receive_complete(struct net_device *ndev,
1080 struct netvsc_device *nvdev, u16 q_idx,
1081 u64 tid, u32 status)
1082{
1083 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1084 struct multi_recv_comp *mrc = &nvchan->mrc;
1085 struct recv_comp_data *rcd;
1086 u32 filled, avail;
1087
1088 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1089
1090 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1091 send_recv_completions(ndev, nvdev, nvchan);
1092 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1093 }
1094
1095 if (unlikely(!avail)) {
1096 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1097 q_idx, tid);
1098 return;
1099 }
1100
1101 rcd = mrc->slots + mrc->next;
1102 rcd->tid = tid;
1103 rcd->status = status;
1104
1105 if (++mrc->next == nvdev->recv_completion_cnt)
1106 mrc->next = 0;
1107}
1108
1109static int netvsc_receive(struct net_device *ndev,
1110 struct netvsc_device *net_device,
1111 struct netvsc_channel *nvchan,
1112 const struct vmpacket_descriptor *desc,
1113 const struct nvsp_message *nvsp)
1114{
1115 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1116 struct vmbus_channel *channel = nvchan->channel;
1117 const struct vmtransfer_page_packet_header *vmxferpage_packet
1118 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1119 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1120 char *recv_buf = net_device->recv_buf;
1121 u32 status = NVSP_STAT_SUCCESS;
1122 int i;
1123 int count = 0;
1124
1125 /* Make sure this is a valid nvsp packet */
1126 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1127 netif_err(net_device_ctx, rx_err, ndev,
1128 "Unknown nvsp packet type received %u\n",
1129 nvsp->hdr.msg_type);
1130 return 0;
1131 }
1132
1133 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1134 netif_err(net_device_ctx, rx_err, ndev,
1135 "Invalid xfer page set id - expecting %x got %x\n",
1136 NETVSC_RECEIVE_BUFFER_ID,
1137 vmxferpage_packet->xfer_pageset_id);
1138 return 0;
1139 }
1140
1141 count = vmxferpage_packet->range_cnt;
1142
1143 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1144 for (i = 0; i < count; i++) {
1145 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1146 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1147 void *data;
1148 int ret;
1149
1150 if (unlikely(offset + buflen > net_device->recv_buf_size)) {
1151 nvchan->rsc.cnt = 0;
1152 status = NVSP_STAT_FAIL;
1153 netif_err(net_device_ctx, rx_err, ndev,
1154 "Packet offset:%u + len:%u too big\n",
1155 offset, buflen);
1156
1157 continue;
1158 }
1159
1160 data = recv_buf + offset;
1161
1162 nvchan->rsc.is_last = (i == count - 1);
1163
1164 trace_rndis_recv(ndev, q_idx, data);
1165
1166 /* Pass it to the upper layer */
1167 ret = rndis_filter_receive(ndev, net_device,
1168 nvchan, data, buflen);
1169
1170 if (unlikely(ret != NVSP_STAT_SUCCESS))
1171 status = NVSP_STAT_FAIL;
1172 }
1173
1174 enq_receive_complete(ndev, net_device, q_idx,
1175 vmxferpage_packet->d.trans_id, status);
1176
1177 return count;
1178}
1179
1180static void netvsc_send_table(struct net_device *ndev,
1181 struct netvsc_device *nvscdev,
1182 const struct nvsp_message *nvmsg,
1183 u32 msglen)
1184{
1185 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1186 u32 count, offset, *tab;
1187 int i;
1188
1189 count = nvmsg->msg.v5_msg.send_table.count;
1190 offset = nvmsg->msg.v5_msg.send_table.offset;
1191
1192 if (count != VRSS_SEND_TAB_SIZE) {
1193 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1194 return;
1195 }
1196
1197 /* If negotiated version <= NVSP_PROTOCOL_VERSION_6, the offset may be
1198 * wrong due to a host bug. So fix the offset here.
1199 */
1200 if (nvscdev->nvsp_version <= NVSP_PROTOCOL_VERSION_6 &&
1201 msglen >= sizeof(struct nvsp_message_header) +
1202 sizeof(union nvsp_6_message_uber) + count * sizeof(u32))
1203 offset = sizeof(struct nvsp_message_header) +
1204 sizeof(union nvsp_6_message_uber);
1205
1206 /* Boundary check for all versions */
1207 if (offset > msglen - count * sizeof(u32)) {
1208 netdev_err(ndev, "Received send-table offset too big:%u\n",
1209 offset);
1210 return;
1211 }
1212
1213 tab = (void *)nvmsg + offset;
1214
1215 for (i = 0; i < count; i++)
1216 net_device_ctx->tx_table[i] = tab[i];
1217}
1218
1219static void netvsc_send_vf(struct net_device *ndev,
1220 const struct nvsp_message *nvmsg)
1221{
1222 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1223
1224 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1225 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1226 netdev_info(ndev, "VF slot %u %s\n",
1227 net_device_ctx->vf_serial,
1228 net_device_ctx->vf_alloc ? "added" : "removed");
1229}
1230
1231static void netvsc_receive_inband(struct net_device *ndev,
1232 struct netvsc_device *nvscdev,
1233 const struct nvsp_message *nvmsg,
1234 u32 msglen)
1235{
1236 switch (nvmsg->hdr.msg_type) {
1237 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1238 netvsc_send_table(ndev, nvscdev, nvmsg, msglen);
1239 break;
1240
1241 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1242 netvsc_send_vf(ndev, nvmsg);
1243 break;
1244 }
1245}
1246
1247static int netvsc_process_raw_pkt(struct hv_device *device,
1248 struct netvsc_channel *nvchan,
1249 struct netvsc_device *net_device,
1250 struct net_device *ndev,
1251 const struct vmpacket_descriptor *desc,
1252 int budget)
1253{
1254 struct vmbus_channel *channel = nvchan->channel;
1255 const struct nvsp_message *nvmsg = hv_pkt_data(desc);
1256 u32 msglen = hv_pkt_datalen(desc);
1257
1258 trace_nvsp_recv(ndev, channel, nvmsg);
1259
1260 switch (desc->type) {
1261 case VM_PKT_COMP:
1262 netvsc_send_completion(ndev, net_device, channel,
1263 desc, budget);
1264 break;
1265
1266 case VM_PKT_DATA_USING_XFER_PAGES:
1267 return netvsc_receive(ndev, net_device, nvchan,
1268 desc, nvmsg);
1269 break;
1270
1271 case VM_PKT_DATA_INBAND:
1272 netvsc_receive_inband(ndev, net_device, nvmsg, msglen);
1273 break;
1274
1275 default:
1276 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1277 desc->type, desc->trans_id);
1278 break;
1279 }
1280
1281 return 0;
1282}
1283
1284static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1285{
1286 struct vmbus_channel *primary = channel->primary_channel;
1287
1288 return primary ? primary->device_obj : channel->device_obj;
1289}
1290
1291/* Network processing softirq
1292 * Process data in incoming ring buffer from host
1293 * Stops when ring is empty or budget is met or exceeded.
1294 */
1295int netvsc_poll(struct napi_struct *napi, int budget)
1296{
1297 struct netvsc_channel *nvchan
1298 = container_of(napi, struct netvsc_channel, napi);
1299 struct netvsc_device *net_device = nvchan->net_device;
1300 struct vmbus_channel *channel = nvchan->channel;
1301 struct hv_device *device = netvsc_channel_to_device(channel);
1302 struct net_device *ndev = hv_get_drvdata(device);
1303 int work_done = 0;
1304 int ret;
1305
1306 /* If starting a new interval */
1307 if (!nvchan->desc)
1308 nvchan->desc = hv_pkt_iter_first(channel);
1309
1310 while (nvchan->desc && work_done < budget) {
1311 work_done += netvsc_process_raw_pkt(device, nvchan, net_device,
1312 ndev, nvchan->desc, budget);
1313 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1314 }
1315
1316 /* Send any pending receive completions */
1317 ret = send_recv_completions(ndev, net_device, nvchan);
1318
1319 /* If it did not exhaust NAPI budget this time
1320 * and not doing busy poll
1321 * then re-enable host interrupts
1322 * and reschedule if ring is not empty
1323 * or sending receive completion failed.
1324 */
1325 if (work_done < budget &&
1326 napi_complete_done(napi, work_done) &&
1327 (ret || hv_end_read(&channel->inbound)) &&
1328 napi_schedule_prep(napi)) {
1329 hv_begin_read(&channel->inbound);
1330 __napi_schedule(napi);
1331 }
1332
1333 /* Driver may overshoot since multiple packets per descriptor */
1334 return min(work_done, budget);
1335}
1336
1337/* Call back when data is available in host ring buffer.
1338 * Processing is deferred until network softirq (NAPI)
1339 */
1340void netvsc_channel_cb(void *context)
1341{
1342 struct netvsc_channel *nvchan = context;
1343 struct vmbus_channel *channel = nvchan->channel;
1344 struct hv_ring_buffer_info *rbi = &channel->inbound;
1345
1346 /* preload first vmpacket descriptor */
1347 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1348
1349 if (napi_schedule_prep(&nvchan->napi)) {
1350 /* disable interrupts from host */
1351 hv_begin_read(rbi);
1352
1353 __napi_schedule_irqoff(&nvchan->napi);
1354 }
1355}
1356
1357/*
1358 * netvsc_device_add - Callback when the device belonging to this
1359 * driver is added
1360 */
1361struct netvsc_device *netvsc_device_add(struct hv_device *device,
1362 const struct netvsc_device_info *device_info)
1363{
1364 int i, ret = 0;
1365 struct netvsc_device *net_device;
1366 struct net_device *ndev = hv_get_drvdata(device);
1367 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1368
1369 net_device = alloc_net_device();
1370 if (!net_device)
1371 return ERR_PTR(-ENOMEM);
1372
1373 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1374 net_device_ctx->tx_table[i] = 0;
1375
1376 /* Because the device uses NAPI, all the interrupt batching and
1377 * control is done via Net softirq, not the channel handling
1378 */
1379 set_channel_read_mode(device->channel, HV_CALL_ISR);
1380
1381 /* If we're reopening the device we may have multiple queues, fill the
1382 * chn_table with the default channel to use it before subchannels are
1383 * opened.
1384 * Initialize the channel state before we open;
1385 * we can be interrupted as soon as we open the channel.
1386 */
1387
1388 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1389 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1390
1391 nvchan->channel = device->channel;
1392 nvchan->net_device = net_device;
1393 u64_stats_init(&nvchan->tx_stats.syncp);
1394 u64_stats_init(&nvchan->rx_stats.syncp);
1395 }
1396
1397 /* Enable NAPI handler before init callbacks */
1398 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1399 netvsc_poll, NAPI_POLL_WEIGHT);
1400
1401 /* Open the channel */
1402 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1403 netvsc_ring_bytes, NULL, 0,
1404 netvsc_channel_cb, net_device->chan_table);
1405
1406 if (ret != 0) {
1407 netdev_err(ndev, "unable to open channel: %d\n", ret);
1408 goto cleanup;
1409 }
1410
1411 /* Channel is opened */
1412 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1413
1414 napi_enable(&net_device->chan_table[0].napi);
1415
1416 /* Connect with the NetVsp */
1417 ret = netvsc_connect_vsp(device, net_device, device_info);
1418 if (ret != 0) {
1419 netdev_err(ndev,
1420 "unable to connect to NetVSP - %d\n", ret);
1421 goto close;
1422 }
1423
1424 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1425 * populated.
1426 */
1427 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1428
1429 return net_device;
1430
1431close:
1432 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1433 napi_disable(&net_device->chan_table[0].napi);
1434
1435 /* Now, we can close the channel safely */
1436 vmbus_close(device->channel);
1437
1438cleanup:
1439 netif_napi_del(&net_device->chan_table[0].napi);
1440 free_netvsc_device(&net_device->rcu);
1441
1442 return ERR_PTR(ret);
1443}