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[deliverable/linux.git] / drivers / net / hyperv / netvsc.c
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 <asm/sync_bitops.h>
32
33 #include "hyperv_net.h"
34
35
36 static struct netvsc_device *alloc_net_device(struct hv_device *device)
37 {
38 struct netvsc_device *net_device;
39 struct net_device *ndev = hv_get_drvdata(device);
40
41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
42 if (!net_device)
43 return NULL;
44
45 init_waitqueue_head(&net_device->wait_drain);
46 net_device->start_remove = false;
47 net_device->destroy = false;
48 net_device->dev = device;
49 net_device->ndev = ndev;
50
51 hv_set_drvdata(device, net_device);
52 return net_device;
53 }
54
55 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
56 {
57 struct netvsc_device *net_device;
58
59 net_device = hv_get_drvdata(device);
60 if (net_device && net_device->destroy)
61 net_device = NULL;
62
63 return net_device;
64 }
65
66 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
67 {
68 struct netvsc_device *net_device;
69
70 net_device = hv_get_drvdata(device);
71
72 if (!net_device)
73 goto get_in_err;
74
75 if (net_device->destroy &&
76 atomic_read(&net_device->num_outstanding_sends) == 0)
77 net_device = NULL;
78
79 get_in_err:
80 return net_device;
81 }
82
83
84 static int netvsc_destroy_buf(struct netvsc_device *net_device)
85 {
86 struct nvsp_message *revoke_packet;
87 int ret = 0;
88 struct net_device *ndev = net_device->ndev;
89
90 /*
91 * If we got a section count, it means we received a
92 * SendReceiveBufferComplete msg (ie sent
93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
94 * to send a revoke msg here
95 */
96 if (net_device->recv_section_cnt) {
97 /* Send the revoke receive buffer */
98 revoke_packet = &net_device->revoke_packet;
99 memset(revoke_packet, 0, sizeof(struct nvsp_message));
100
101 revoke_packet->hdr.msg_type =
102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
103 revoke_packet->msg.v1_msg.
104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
105
106 ret = vmbus_sendpacket(net_device->dev->channel,
107 revoke_packet,
108 sizeof(struct nvsp_message),
109 (unsigned long)revoke_packet,
110 VM_PKT_DATA_INBAND, 0);
111 /*
112 * If we failed here, we might as well return and
113 * have a leak rather than continue and a bugchk
114 */
115 if (ret != 0) {
116 netdev_err(ndev, "unable to send "
117 "revoke receive buffer to netvsp\n");
118 return ret;
119 }
120 }
121
122 /* Teardown the gpadl on the vsp end */
123 if (net_device->recv_buf_gpadl_handle) {
124 ret = vmbus_teardown_gpadl(net_device->dev->channel,
125 net_device->recv_buf_gpadl_handle);
126
127 /* If we failed here, we might as well return and have a leak
128 * rather than continue and a bugchk
129 */
130 if (ret != 0) {
131 netdev_err(ndev,
132 "unable to teardown receive buffer's gpadl\n");
133 return ret;
134 }
135 net_device->recv_buf_gpadl_handle = 0;
136 }
137
138 if (net_device->recv_buf) {
139 /* Free up the receive buffer */
140 vfree(net_device->recv_buf);
141 net_device->recv_buf = NULL;
142 }
143
144 if (net_device->recv_section) {
145 net_device->recv_section_cnt = 0;
146 kfree(net_device->recv_section);
147 net_device->recv_section = NULL;
148 }
149
150 /* Deal with the send buffer we may have setup.
151 * If we got a send section size, it means we received a
152 * SendsendBufferComplete msg (ie sent
153 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
154 * to send a revoke msg here
155 */
156 if (net_device->send_section_size) {
157 /* Send the revoke receive buffer */
158 revoke_packet = &net_device->revoke_packet;
159 memset(revoke_packet, 0, sizeof(struct nvsp_message));
160
161 revoke_packet->hdr.msg_type =
162 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
163 revoke_packet->msg.v1_msg.revoke_recv_buf.id = 0;
164
165 ret = vmbus_sendpacket(net_device->dev->channel,
166 revoke_packet,
167 sizeof(struct nvsp_message),
168 (unsigned long)revoke_packet,
169 VM_PKT_DATA_INBAND, 0);
170 /* If we failed here, we might as well return and
171 * have a leak rather than continue and a bugchk
172 */
173 if (ret != 0) {
174 netdev_err(ndev, "unable to send "
175 "revoke send buffer to netvsp\n");
176 return ret;
177 }
178 }
179 /* Teardown the gpadl on the vsp end */
180 if (net_device->send_buf_gpadl_handle) {
181 ret = vmbus_teardown_gpadl(net_device->dev->channel,
182 net_device->send_buf_gpadl_handle);
183
184 /* If we failed here, we might as well return and have a leak
185 * rather than continue and a bugchk
186 */
187 if (ret != 0) {
188 netdev_err(ndev,
189 "unable to teardown send buffer's gpadl\n");
190 return ret;
191 }
192 net_device->send_buf_gpadl_handle = 0;
193 }
194 if (net_device->send_buf) {
195 /* Free up the receive buffer */
196 vfree(net_device->send_buf);
197 net_device->send_buf = NULL;
198 }
199 kfree(net_device->send_section_map);
200
201 return ret;
202 }
203
204 static int netvsc_init_buf(struct hv_device *device)
205 {
206 int ret = 0;
207 int t;
208 struct netvsc_device *net_device;
209 struct nvsp_message *init_packet;
210 struct net_device *ndev;
211
212 net_device = get_outbound_net_device(device);
213 if (!net_device)
214 return -ENODEV;
215 ndev = net_device->ndev;
216
217 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
218 if (!net_device->recv_buf) {
219 netdev_err(ndev, "unable to allocate receive "
220 "buffer of size %d\n", net_device->recv_buf_size);
221 ret = -ENOMEM;
222 goto cleanup;
223 }
224
225 /*
226 * Establish the gpadl handle for this buffer on this
227 * channel. Note: This call uses the vmbus connection rather
228 * than the channel to establish the gpadl handle.
229 */
230 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
231 net_device->recv_buf_size,
232 &net_device->recv_buf_gpadl_handle);
233 if (ret != 0) {
234 netdev_err(ndev,
235 "unable to establish receive buffer's gpadl\n");
236 goto cleanup;
237 }
238
239
240 /* Notify the NetVsp of the gpadl handle */
241 init_packet = &net_device->channel_init_pkt;
242
243 memset(init_packet, 0, sizeof(struct nvsp_message));
244
245 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
246 init_packet->msg.v1_msg.send_recv_buf.
247 gpadl_handle = net_device->recv_buf_gpadl_handle;
248 init_packet->msg.v1_msg.
249 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
250
251 /* Send the gpadl notification request */
252 ret = vmbus_sendpacket(device->channel, init_packet,
253 sizeof(struct nvsp_message),
254 (unsigned long)init_packet,
255 VM_PKT_DATA_INBAND,
256 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
257 if (ret != 0) {
258 netdev_err(ndev,
259 "unable to send receive buffer's gpadl to netvsp\n");
260 goto cleanup;
261 }
262
263 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
264 BUG_ON(t == 0);
265
266
267 /* Check the response */
268 if (init_packet->msg.v1_msg.
269 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
270 netdev_err(ndev, "Unable to complete receive buffer "
271 "initialization with NetVsp - status %d\n",
272 init_packet->msg.v1_msg.
273 send_recv_buf_complete.status);
274 ret = -EINVAL;
275 goto cleanup;
276 }
277
278 /* Parse the response */
279
280 net_device->recv_section_cnt = init_packet->msg.
281 v1_msg.send_recv_buf_complete.num_sections;
282
283 net_device->recv_section = kmemdup(
284 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
285 net_device->recv_section_cnt *
286 sizeof(struct nvsp_1_receive_buffer_section),
287 GFP_KERNEL);
288 if (net_device->recv_section == NULL) {
289 ret = -EINVAL;
290 goto cleanup;
291 }
292
293 /*
294 * For 1st release, there should only be 1 section that represents the
295 * entire receive buffer
296 */
297 if (net_device->recv_section_cnt != 1 ||
298 net_device->recv_section->offset != 0) {
299 ret = -EINVAL;
300 goto cleanup;
301 }
302
303 /* Now setup the send buffer.
304 */
305 net_device->send_buf = vzalloc(net_device->send_buf_size);
306 if (!net_device->send_buf) {
307 netdev_err(ndev, "unable to allocate send "
308 "buffer of size %d\n", net_device->send_buf_size);
309 ret = -ENOMEM;
310 goto cleanup;
311 }
312
313 /* Establish the gpadl handle for this buffer on this
314 * channel. Note: This call uses the vmbus connection rather
315 * than the channel to establish the gpadl handle.
316 */
317 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
318 net_device->send_buf_size,
319 &net_device->send_buf_gpadl_handle);
320 if (ret != 0) {
321 netdev_err(ndev,
322 "unable to establish send buffer's gpadl\n");
323 goto cleanup;
324 }
325
326 /* Notify the NetVsp of the gpadl handle */
327 init_packet = &net_device->channel_init_pkt;
328 memset(init_packet, 0, sizeof(struct nvsp_message));
329 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
330 init_packet->msg.v1_msg.send_recv_buf.gpadl_handle =
331 net_device->send_buf_gpadl_handle;
332 init_packet->msg.v1_msg.send_recv_buf.id = 0;
333
334 /* Send the gpadl notification request */
335 ret = vmbus_sendpacket(device->channel, init_packet,
336 sizeof(struct nvsp_message),
337 (unsigned long)init_packet,
338 VM_PKT_DATA_INBAND,
339 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
340 if (ret != 0) {
341 netdev_err(ndev,
342 "unable to send send buffer's gpadl to netvsp\n");
343 goto cleanup;
344 }
345
346 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
347 BUG_ON(t == 0);
348
349 /* Check the response */
350 if (init_packet->msg.v1_msg.
351 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
352 netdev_err(ndev, "Unable to complete send buffer "
353 "initialization with NetVsp - status %d\n",
354 init_packet->msg.v1_msg.
355 send_recv_buf_complete.status);
356 ret = -EINVAL;
357 goto cleanup;
358 }
359
360 /* Parse the response */
361 net_device->send_section_size = init_packet->msg.
362 v1_msg.send_send_buf_complete.section_size;
363
364 /* Section count is simply the size divided by the section size.
365 */
366 net_device->send_section_cnt =
367 net_device->send_buf_size/net_device->send_section_size;
368
369 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
370 net_device->send_section_size, net_device->send_section_cnt);
371
372 /* Setup state for managing the send buffer. */
373 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
374 BITS_PER_LONG);
375
376 net_device->send_section_map =
377 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
378 if (net_device->send_section_map == NULL) {
379 ret = -ENOMEM;
380 goto cleanup;
381 }
382
383 goto exit;
384
385 cleanup:
386 netvsc_destroy_buf(net_device);
387
388 exit:
389 return ret;
390 }
391
392
393 /* Negotiate NVSP protocol version */
394 static int negotiate_nvsp_ver(struct hv_device *device,
395 struct netvsc_device *net_device,
396 struct nvsp_message *init_packet,
397 u32 nvsp_ver)
398 {
399 int ret, t;
400
401 memset(init_packet, 0, sizeof(struct nvsp_message));
402 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
403 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
404 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
405
406 /* Send the init request */
407 ret = vmbus_sendpacket(device->channel, init_packet,
408 sizeof(struct nvsp_message),
409 (unsigned long)init_packet,
410 VM_PKT_DATA_INBAND,
411 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
412
413 if (ret != 0)
414 return ret;
415
416 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
417
418 if (t == 0)
419 return -ETIMEDOUT;
420
421 if (init_packet->msg.init_msg.init_complete.status !=
422 NVSP_STAT_SUCCESS)
423 return -EINVAL;
424
425 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
426 return 0;
427
428 /* NVSPv2 only: Send NDIS config */
429 memset(init_packet, 0, sizeof(struct nvsp_message));
430 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
431 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
432 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
433
434 ret = vmbus_sendpacket(device->channel, init_packet,
435 sizeof(struct nvsp_message),
436 (unsigned long)init_packet,
437 VM_PKT_DATA_INBAND, 0);
438
439 return ret;
440 }
441
442 static int netvsc_connect_vsp(struct hv_device *device)
443 {
444 int ret;
445 struct netvsc_device *net_device;
446 struct nvsp_message *init_packet;
447 int ndis_version;
448 struct net_device *ndev;
449 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
450 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
451 int i, num_ver = 4; /* number of different NVSP versions */
452
453 net_device = get_outbound_net_device(device);
454 if (!net_device)
455 return -ENODEV;
456 ndev = net_device->ndev;
457
458 init_packet = &net_device->channel_init_pkt;
459
460 /* Negotiate the latest NVSP protocol supported */
461 for (i = num_ver - 1; i >= 0; i--)
462 if (negotiate_nvsp_ver(device, net_device, init_packet,
463 ver_list[i]) == 0) {
464 net_device->nvsp_version = ver_list[i];
465 break;
466 }
467
468 if (i < 0) {
469 ret = -EPROTO;
470 goto cleanup;
471 }
472
473 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
474
475 /* Send the ndis version */
476 memset(init_packet, 0, sizeof(struct nvsp_message));
477
478 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
479 ndis_version = 0x00060001;
480 else
481 ndis_version = 0x0006001e;
482
483 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
484 init_packet->msg.v1_msg.
485 send_ndis_ver.ndis_major_ver =
486 (ndis_version & 0xFFFF0000) >> 16;
487 init_packet->msg.v1_msg.
488 send_ndis_ver.ndis_minor_ver =
489 ndis_version & 0xFFFF;
490
491 /* Send the init request */
492 ret = vmbus_sendpacket(device->channel, init_packet,
493 sizeof(struct nvsp_message),
494 (unsigned long)init_packet,
495 VM_PKT_DATA_INBAND, 0);
496 if (ret != 0)
497 goto cleanup;
498
499 /* Post the big receive buffer to NetVSP */
500 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
501 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
502 else
503 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
504 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
505
506 ret = netvsc_init_buf(device);
507
508 cleanup:
509 return ret;
510 }
511
512 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
513 {
514 netvsc_destroy_buf(net_device);
515 }
516
517 /*
518 * netvsc_device_remove - Callback when the root bus device is removed
519 */
520 int netvsc_device_remove(struct hv_device *device)
521 {
522 struct netvsc_device *net_device;
523 unsigned long flags;
524
525 net_device = hv_get_drvdata(device);
526
527 netvsc_disconnect_vsp(net_device);
528
529 /*
530 * Since we have already drained, we don't need to busy wait
531 * as was done in final_release_stor_device()
532 * Note that we cannot set the ext pointer to NULL until
533 * we have drained - to drain the outgoing packets, we need to
534 * allow incoming packets.
535 */
536
537 spin_lock_irqsave(&device->channel->inbound_lock, flags);
538 hv_set_drvdata(device, NULL);
539 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
540
541 /*
542 * At this point, no one should be accessing net_device
543 * except in here
544 */
545 dev_notice(&device->device, "net device safe to remove\n");
546
547 /* Now, we can close the channel safely */
548 vmbus_close(device->channel);
549
550 /* Release all resources */
551 if (net_device->sub_cb_buf)
552 vfree(net_device->sub_cb_buf);
553
554 kfree(net_device);
555 return 0;
556 }
557
558
559 #define RING_AVAIL_PERCENT_HIWATER 20
560 #define RING_AVAIL_PERCENT_LOWATER 10
561
562 /*
563 * Get the percentage of available bytes to write in the ring.
564 * The return value is in range from 0 to 100.
565 */
566 static inline u32 hv_ringbuf_avail_percent(
567 struct hv_ring_buffer_info *ring_info)
568 {
569 u32 avail_read, avail_write;
570
571 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
572
573 return avail_write * 100 / ring_info->ring_datasize;
574 }
575
576 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
577 u32 index)
578 {
579 sync_change_bit(index, net_device->send_section_map);
580 }
581
582 static void netvsc_send_completion(struct netvsc_device *net_device,
583 struct hv_device *device,
584 struct vmpacket_descriptor *packet)
585 {
586 struct nvsp_message *nvsp_packet;
587 struct hv_netvsc_packet *nvsc_packet;
588 struct net_device *ndev;
589 u32 send_index;
590
591 ndev = net_device->ndev;
592
593 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
594 (packet->offset8 << 3));
595
596 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
597 (nvsp_packet->hdr.msg_type ==
598 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
599 (nvsp_packet->hdr.msg_type ==
600 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
601 (nvsp_packet->hdr.msg_type ==
602 NVSP_MSG5_TYPE_SUBCHANNEL)) {
603 /* Copy the response back */
604 memcpy(&net_device->channel_init_pkt, nvsp_packet,
605 sizeof(struct nvsp_message));
606 complete(&net_device->channel_init_wait);
607 } else if (nvsp_packet->hdr.msg_type ==
608 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
609 int num_outstanding_sends;
610 u16 q_idx = 0;
611 struct vmbus_channel *channel = device->channel;
612 int queue_sends;
613
614 /* Get the send context */
615 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
616 packet->trans_id;
617
618 /* Notify the layer above us */
619 if (nvsc_packet) {
620 send_index = nvsc_packet->send_buf_index;
621 if (send_index != NETVSC_INVALID_INDEX)
622 netvsc_free_send_slot(net_device, send_index);
623 q_idx = nvsc_packet->q_idx;
624 channel = nvsc_packet->channel;
625 nvsc_packet->send_completion(nvsc_packet->
626 send_completion_ctx);
627 }
628
629 num_outstanding_sends =
630 atomic_dec_return(&net_device->num_outstanding_sends);
631 queue_sends = atomic_dec_return(&net_device->
632 queue_sends[q_idx]);
633
634 if (net_device->destroy && num_outstanding_sends == 0)
635 wake_up(&net_device->wait_drain);
636
637 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
638 !net_device->start_remove &&
639 (hv_ringbuf_avail_percent(&channel->outbound) >
640 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
641 netif_tx_wake_queue(netdev_get_tx_queue(
642 ndev, q_idx));
643 } else {
644 netdev_err(ndev, "Unknown send completion packet type- "
645 "%d received!!\n", nvsp_packet->hdr.msg_type);
646 }
647
648 }
649
650 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
651 {
652 unsigned long index;
653 u32 max_words = net_device->map_words;
654 unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
655 u32 section_cnt = net_device->send_section_cnt;
656 int ret_val = NETVSC_INVALID_INDEX;
657 int i;
658 int prev_val;
659
660 for (i = 0; i < max_words; i++) {
661 if (!~(map_addr[i]))
662 continue;
663 index = ffz(map_addr[i]);
664 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
665 if (prev_val)
666 continue;
667 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
668 break;
669 ret_val = (index + (i * BITS_PER_LONG));
670 break;
671 }
672 return ret_val;
673 }
674
675 u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
676 unsigned int section_index,
677 struct hv_netvsc_packet *packet)
678 {
679 char *start = net_device->send_buf;
680 char *dest = (start + (section_index * net_device->send_section_size));
681 int i;
682 u32 msg_size = 0;
683
684 for (i = 0; i < packet->page_buf_cnt; i++) {
685 char *src = phys_to_virt(packet->page_buf[i].pfn << PAGE_SHIFT);
686 u32 offset = packet->page_buf[i].offset;
687 u32 len = packet->page_buf[i].len;
688
689 memcpy(dest, (src + offset), len);
690 msg_size += len;
691 dest += len;
692 }
693 return msg_size;
694 }
695
696 int netvsc_send(struct hv_device *device,
697 struct hv_netvsc_packet *packet)
698 {
699 struct netvsc_device *net_device;
700 int ret = 0;
701 struct nvsp_message sendMessage;
702 struct net_device *ndev;
703 struct vmbus_channel *out_channel = NULL;
704 u64 req_id;
705 unsigned int section_index = NETVSC_INVALID_INDEX;
706 u32 msg_size = 0;
707 struct sk_buff *skb;
708
709
710 net_device = get_outbound_net_device(device);
711 if (!net_device)
712 return -ENODEV;
713 ndev = net_device->ndev;
714
715 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
716 if (packet->is_data_pkt) {
717 /* 0 is RMC_DATA; */
718 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
719 } else {
720 /* 1 is RMC_CONTROL; */
721 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
722 }
723
724 /* Attempt to send via sendbuf */
725 if (packet->total_data_buflen < net_device->send_section_size) {
726 section_index = netvsc_get_next_send_section(net_device);
727 if (section_index != NETVSC_INVALID_INDEX) {
728 msg_size = netvsc_copy_to_send_buf(net_device,
729 section_index,
730 packet);
731 skb = (struct sk_buff *)
732 (unsigned long)packet->send_completion_tid;
733 if (skb)
734 dev_kfree_skb_any(skb);
735 packet->page_buf_cnt = 0;
736 }
737 }
738 packet->send_buf_index = section_index;
739
740
741 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
742 section_index;
743 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = msg_size;
744
745 if (packet->send_completion)
746 req_id = (ulong)packet;
747 else
748 req_id = 0;
749
750 out_channel = net_device->chn_table[packet->q_idx];
751 if (out_channel == NULL)
752 out_channel = device->channel;
753 packet->channel = out_channel;
754
755 if (packet->page_buf_cnt) {
756 ret = vmbus_sendpacket_pagebuffer(out_channel,
757 packet->page_buf,
758 packet->page_buf_cnt,
759 &sendMessage,
760 sizeof(struct nvsp_message),
761 req_id);
762 } else {
763 ret = vmbus_sendpacket(out_channel, &sendMessage,
764 sizeof(struct nvsp_message),
765 req_id,
766 VM_PKT_DATA_INBAND,
767 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
768 }
769
770 if (ret == 0) {
771 atomic_inc(&net_device->num_outstanding_sends);
772 atomic_inc(&net_device->queue_sends[packet->q_idx]);
773
774 if (hv_ringbuf_avail_percent(&out_channel->outbound) <
775 RING_AVAIL_PERCENT_LOWATER) {
776 netif_tx_stop_queue(netdev_get_tx_queue(
777 ndev, packet->q_idx));
778
779 if (atomic_read(&net_device->
780 queue_sends[packet->q_idx]) < 1)
781 netif_tx_wake_queue(netdev_get_tx_queue(
782 ndev, packet->q_idx));
783 }
784 } else if (ret == -EAGAIN) {
785 netif_tx_stop_queue(netdev_get_tx_queue(
786 ndev, packet->q_idx));
787 if (atomic_read(&net_device->queue_sends[packet->q_idx]) < 1) {
788 netif_tx_wake_queue(netdev_get_tx_queue(
789 ndev, packet->q_idx));
790 ret = -ENOSPC;
791 }
792 } else {
793 netdev_err(ndev, "Unable to send packet %p ret %d\n",
794 packet, ret);
795 }
796
797 return ret;
798 }
799
800 static void netvsc_send_recv_completion(struct hv_device *device,
801 struct vmbus_channel *channel,
802 struct netvsc_device *net_device,
803 u64 transaction_id, u32 status)
804 {
805 struct nvsp_message recvcompMessage;
806 int retries = 0;
807 int ret;
808 struct net_device *ndev;
809
810 ndev = net_device->ndev;
811
812 recvcompMessage.hdr.msg_type =
813 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
814
815 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
816
817 retry_send_cmplt:
818 /* Send the completion */
819 ret = vmbus_sendpacket(channel, &recvcompMessage,
820 sizeof(struct nvsp_message), transaction_id,
821 VM_PKT_COMP, 0);
822 if (ret == 0) {
823 /* success */
824 /* no-op */
825 } else if (ret == -EAGAIN) {
826 /* no more room...wait a bit and attempt to retry 3 times */
827 retries++;
828 netdev_err(ndev, "unable to send receive completion pkt"
829 " (tid %llx)...retrying %d\n", transaction_id, retries);
830
831 if (retries < 4) {
832 udelay(100);
833 goto retry_send_cmplt;
834 } else {
835 netdev_err(ndev, "unable to send receive "
836 "completion pkt (tid %llx)...give up retrying\n",
837 transaction_id);
838 }
839 } else {
840 netdev_err(ndev, "unable to send receive "
841 "completion pkt - %llx\n", transaction_id);
842 }
843 }
844
845 static void netvsc_receive(struct netvsc_device *net_device,
846 struct vmbus_channel *channel,
847 struct hv_device *device,
848 struct vmpacket_descriptor *packet)
849 {
850 struct vmtransfer_page_packet_header *vmxferpage_packet;
851 struct nvsp_message *nvsp_packet;
852 struct hv_netvsc_packet nv_pkt;
853 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
854 u32 status = NVSP_STAT_SUCCESS;
855 int i;
856 int count = 0;
857 struct net_device *ndev;
858
859 ndev = net_device->ndev;
860
861 /*
862 * All inbound packets other than send completion should be xfer page
863 * packet
864 */
865 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
866 netdev_err(ndev, "Unknown packet type received - %d\n",
867 packet->type);
868 return;
869 }
870
871 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
872 (packet->offset8 << 3));
873
874 /* Make sure this is a valid nvsp packet */
875 if (nvsp_packet->hdr.msg_type !=
876 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
877 netdev_err(ndev, "Unknown nvsp packet type received-"
878 " %d\n", nvsp_packet->hdr.msg_type);
879 return;
880 }
881
882 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
883
884 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
885 netdev_err(ndev, "Invalid xfer page set id - "
886 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
887 vmxferpage_packet->xfer_pageset_id);
888 return;
889 }
890
891 count = vmxferpage_packet->range_cnt;
892 netvsc_packet->device = device;
893 netvsc_packet->channel = channel;
894
895 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
896 for (i = 0; i < count; i++) {
897 /* Initialize the netvsc packet */
898 netvsc_packet->status = NVSP_STAT_SUCCESS;
899 netvsc_packet->data = (void *)((unsigned long)net_device->
900 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
901 netvsc_packet->total_data_buflen =
902 vmxferpage_packet->ranges[i].byte_count;
903
904 /* Pass it to the upper layer */
905 rndis_filter_receive(device, netvsc_packet);
906
907 if (netvsc_packet->status != NVSP_STAT_SUCCESS)
908 status = NVSP_STAT_FAIL;
909 }
910
911 netvsc_send_recv_completion(device, channel, net_device,
912 vmxferpage_packet->d.trans_id, status);
913 }
914
915
916 static void netvsc_send_table(struct hv_device *hdev,
917 struct vmpacket_descriptor *vmpkt)
918 {
919 struct netvsc_device *nvscdev;
920 struct net_device *ndev;
921 struct nvsp_message *nvmsg;
922 int i;
923 u32 count, *tab;
924
925 nvscdev = get_outbound_net_device(hdev);
926 if (!nvscdev)
927 return;
928 ndev = nvscdev->ndev;
929
930 nvmsg = (struct nvsp_message *)((unsigned long)vmpkt +
931 (vmpkt->offset8 << 3));
932
933 if (nvmsg->hdr.msg_type != NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE)
934 return;
935
936 count = nvmsg->msg.v5_msg.send_table.count;
937 if (count != VRSS_SEND_TAB_SIZE) {
938 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
939 return;
940 }
941
942 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
943 nvmsg->msg.v5_msg.send_table.offset);
944
945 for (i = 0; i < count; i++)
946 nvscdev->send_table[i] = tab[i];
947 }
948
949 void netvsc_channel_cb(void *context)
950 {
951 int ret;
952 struct vmbus_channel *channel = (struct vmbus_channel *)context;
953 struct hv_device *device;
954 struct netvsc_device *net_device;
955 u32 bytes_recvd;
956 u64 request_id;
957 struct vmpacket_descriptor *desc;
958 unsigned char *buffer;
959 int bufferlen = NETVSC_PACKET_SIZE;
960 struct net_device *ndev;
961
962 if (channel->primary_channel != NULL)
963 device = channel->primary_channel->device_obj;
964 else
965 device = channel->device_obj;
966
967 net_device = get_inbound_net_device(device);
968 if (!net_device)
969 return;
970 ndev = net_device->ndev;
971 buffer = get_per_channel_state(channel);
972
973 do {
974 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
975 &bytes_recvd, &request_id);
976 if (ret == 0) {
977 if (bytes_recvd > 0) {
978 desc = (struct vmpacket_descriptor *)buffer;
979 switch (desc->type) {
980 case VM_PKT_COMP:
981 netvsc_send_completion(net_device,
982 device, desc);
983 break;
984
985 case VM_PKT_DATA_USING_XFER_PAGES:
986 netvsc_receive(net_device, channel,
987 device, desc);
988 break;
989
990 case VM_PKT_DATA_INBAND:
991 netvsc_send_table(device, desc);
992 break;
993
994 default:
995 netdev_err(ndev,
996 "unhandled packet type %d, "
997 "tid %llx len %d\n",
998 desc->type, request_id,
999 bytes_recvd);
1000 break;
1001 }
1002
1003 } else {
1004 /*
1005 * We are done for this pass.
1006 */
1007 break;
1008 }
1009
1010 } else if (ret == -ENOBUFS) {
1011 if (bufferlen > NETVSC_PACKET_SIZE)
1012 kfree(buffer);
1013 /* Handle large packet */
1014 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1015 if (buffer == NULL) {
1016 /* Try again next time around */
1017 netdev_err(ndev,
1018 "unable to allocate buffer of size "
1019 "(%d)!!\n", bytes_recvd);
1020 break;
1021 }
1022
1023 bufferlen = bytes_recvd;
1024 }
1025 } while (1);
1026
1027 if (bufferlen > NETVSC_PACKET_SIZE)
1028 kfree(buffer);
1029 return;
1030 }
1031
1032 /*
1033 * netvsc_device_add - Callback when the device belonging to this
1034 * driver is added
1035 */
1036 int netvsc_device_add(struct hv_device *device, void *additional_info)
1037 {
1038 int ret = 0;
1039 int ring_size =
1040 ((struct netvsc_device_info *)additional_info)->ring_size;
1041 struct netvsc_device *net_device;
1042 struct net_device *ndev;
1043
1044 net_device = alloc_net_device(device);
1045 if (!net_device) {
1046 ret = -ENOMEM;
1047 goto cleanup;
1048 }
1049
1050 net_device->ring_size = ring_size;
1051
1052 /*
1053 * Coming into this function, struct net_device * is
1054 * registered as the driver private data.
1055 * In alloc_net_device(), we register struct netvsc_device *
1056 * as the driver private data and stash away struct net_device *
1057 * in struct netvsc_device *.
1058 */
1059 ndev = net_device->ndev;
1060
1061 /* Initialize the NetVSC channel extension */
1062 init_completion(&net_device->channel_init_wait);
1063
1064 set_per_channel_state(device->channel, net_device->cb_buffer);
1065
1066 /* Open the channel */
1067 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1068 ring_size * PAGE_SIZE, NULL, 0,
1069 netvsc_channel_cb, device->channel);
1070
1071 if (ret != 0) {
1072 netdev_err(ndev, "unable to open channel: %d\n", ret);
1073 goto cleanup;
1074 }
1075
1076 /* Channel is opened */
1077 pr_info("hv_netvsc channel opened successfully\n");
1078
1079 net_device->chn_table[0] = device->channel;
1080
1081 /* Connect with the NetVsp */
1082 ret = netvsc_connect_vsp(device);
1083 if (ret != 0) {
1084 netdev_err(ndev,
1085 "unable to connect to NetVSP - %d\n", ret);
1086 goto close;
1087 }
1088
1089 return ret;
1090
1091 close:
1092 /* Now, we can close the channel safely */
1093 vmbus_close(device->channel);
1094
1095 cleanup:
1096 kfree(net_device);
1097
1098 return ret;
1099 }
Linux kernel - Deliverables
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