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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 <linux/vmalloc.h>
32 #include <asm/sync_bitops.h>
33
34 #include "hyperv_net.h"
35
36
37 static 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 int i;
42
43 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
44 if (!net_device)
45 return NULL;
46
47 net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL);
48 if (!net_device->cb_buffer) {
49 kfree(net_device);
50 return NULL;
51 }
52
53 init_waitqueue_head(&net_device->wait_drain);
54 net_device->start_remove = false;
55 net_device->destroy = false;
56 net_device->dev = device;
57 net_device->ndev = ndev;
58 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
59 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
60
61 for (i = 0; i < num_online_cpus(); i++)
62 spin_lock_init(&net_device->msd[i].lock);
63
64 hv_set_drvdata(device, net_device);
65 return net_device;
66 }
67
68 static void free_netvsc_device(struct netvsc_device *nvdev)
69 {
70 kfree(nvdev->cb_buffer);
71 kfree(nvdev);
72 }
73
74 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
75 {
76 struct netvsc_device *net_device;
77
78 net_device = hv_get_drvdata(device);
79 if (net_device && net_device->destroy)
80 net_device = NULL;
81
82 return net_device;
83 }
84
85 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
86 {
87 struct netvsc_device *net_device;
88
89 net_device = hv_get_drvdata(device);
90
91 if (!net_device)
92 goto get_in_err;
93
94 if (net_device->destroy &&
95 atomic_read(&net_device->num_outstanding_sends) == 0)
96 net_device = NULL;
97
98 get_in_err:
99 return net_device;
100 }
101
102
103 static int netvsc_destroy_buf(struct netvsc_device *net_device)
104 {
105 struct nvsp_message *revoke_packet;
106 int ret = 0;
107 struct net_device *ndev = net_device->ndev;
108
109 /*
110 * If we got a section count, it means we received a
111 * SendReceiveBufferComplete msg (ie sent
112 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
113 * to send a revoke msg here
114 */
115 if (net_device->recv_section_cnt) {
116 /* Send the revoke receive buffer */
117 revoke_packet = &net_device->revoke_packet;
118 memset(revoke_packet, 0, sizeof(struct nvsp_message));
119
120 revoke_packet->hdr.msg_type =
121 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
122 revoke_packet->msg.v1_msg.
123 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
124
125 ret = vmbus_sendpacket(net_device->dev->channel,
126 revoke_packet,
127 sizeof(struct nvsp_message),
128 (unsigned long)revoke_packet,
129 VM_PKT_DATA_INBAND, 0);
130 /*
131 * If we failed here, we might as well return and
132 * have a leak rather than continue and a bugchk
133 */
134 if (ret != 0) {
135 netdev_err(ndev, "unable to send "
136 "revoke receive buffer to netvsp\n");
137 return ret;
138 }
139 }
140
141 /* Teardown the gpadl on the vsp end */
142 if (net_device->recv_buf_gpadl_handle) {
143 ret = vmbus_teardown_gpadl(net_device->dev->channel,
144 net_device->recv_buf_gpadl_handle);
145
146 /* If we failed here, we might as well return and have a leak
147 * rather than continue and a bugchk
148 */
149 if (ret != 0) {
150 netdev_err(ndev,
151 "unable to teardown receive buffer's gpadl\n");
152 return ret;
153 }
154 net_device->recv_buf_gpadl_handle = 0;
155 }
156
157 if (net_device->recv_buf) {
158 /* Free up the receive buffer */
159 vfree(net_device->recv_buf);
160 net_device->recv_buf = NULL;
161 }
162
163 if (net_device->recv_section) {
164 net_device->recv_section_cnt = 0;
165 kfree(net_device->recv_section);
166 net_device->recv_section = NULL;
167 }
168
169 /* Deal with the send buffer we may have setup.
170 * If we got a send section size, it means we received a
171 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
172 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
173 * to send a revoke msg here
174 */
175 if (net_device->send_section_size) {
176 /* Send the revoke receive buffer */
177 revoke_packet = &net_device->revoke_packet;
178 memset(revoke_packet, 0, sizeof(struct nvsp_message));
179
180 revoke_packet->hdr.msg_type =
181 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
182 revoke_packet->msg.v1_msg.revoke_send_buf.id =
183 NETVSC_SEND_BUFFER_ID;
184
185 ret = vmbus_sendpacket(net_device->dev->channel,
186 revoke_packet,
187 sizeof(struct nvsp_message),
188 (unsigned long)revoke_packet,
189 VM_PKT_DATA_INBAND, 0);
190 /* If we failed here, we might as well return and
191 * have a leak rather than continue and a bugchk
192 */
193 if (ret != 0) {
194 netdev_err(ndev, "unable to send "
195 "revoke send buffer to netvsp\n");
196 return ret;
197 }
198 }
199 /* Teardown the gpadl on the vsp end */
200 if (net_device->send_buf_gpadl_handle) {
201 ret = vmbus_teardown_gpadl(net_device->dev->channel,
202 net_device->send_buf_gpadl_handle);
203
204 /* If we failed here, we might as well return and have a leak
205 * rather than continue and a bugchk
206 */
207 if (ret != 0) {
208 netdev_err(ndev,
209 "unable to teardown send buffer's gpadl\n");
210 return ret;
211 }
212 net_device->send_buf_gpadl_handle = 0;
213 }
214 if (net_device->send_buf) {
215 /* Free up the send buffer */
216 vfree(net_device->send_buf);
217 net_device->send_buf = NULL;
218 }
219 kfree(net_device->send_section_map);
220
221 return ret;
222 }
223
224 static int netvsc_init_buf(struct hv_device *device)
225 {
226 int ret = 0;
227 unsigned long t;
228 struct netvsc_device *net_device;
229 struct nvsp_message *init_packet;
230 struct net_device *ndev;
231 int node;
232
233 net_device = get_outbound_net_device(device);
234 if (!net_device)
235 return -ENODEV;
236 ndev = net_device->ndev;
237
238 node = cpu_to_node(device->channel->target_cpu);
239 net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node);
240 if (!net_device->recv_buf)
241 net_device->recv_buf = vzalloc(net_device->recv_buf_size);
242
243 if (!net_device->recv_buf) {
244 netdev_err(ndev, "unable to allocate receive "
245 "buffer of size %d\n", net_device->recv_buf_size);
246 ret = -ENOMEM;
247 goto cleanup;
248 }
249
250 /*
251 * Establish the gpadl handle for this buffer on this
252 * channel. Note: This call uses the vmbus connection rather
253 * than the channel to establish the gpadl handle.
254 */
255 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
256 net_device->recv_buf_size,
257 &net_device->recv_buf_gpadl_handle);
258 if (ret != 0) {
259 netdev_err(ndev,
260 "unable to establish receive buffer's gpadl\n");
261 goto cleanup;
262 }
263
264
265 /* Notify the NetVsp of the gpadl handle */
266 init_packet = &net_device->channel_init_pkt;
267
268 memset(init_packet, 0, sizeof(struct nvsp_message));
269
270 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
271 init_packet->msg.v1_msg.send_recv_buf.
272 gpadl_handle = net_device->recv_buf_gpadl_handle;
273 init_packet->msg.v1_msg.
274 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
275
276 /* Send the gpadl notification request */
277 ret = vmbus_sendpacket(device->channel, init_packet,
278 sizeof(struct nvsp_message),
279 (unsigned long)init_packet,
280 VM_PKT_DATA_INBAND,
281 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
282 if (ret != 0) {
283 netdev_err(ndev,
284 "unable to send receive buffer's gpadl to netvsp\n");
285 goto cleanup;
286 }
287
288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
289 BUG_ON(t == 0);
290
291
292 /* Check the response */
293 if (init_packet->msg.v1_msg.
294 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
295 netdev_err(ndev, "Unable to complete receive buffer "
296 "initialization with NetVsp - status %d\n",
297 init_packet->msg.v1_msg.
298 send_recv_buf_complete.status);
299 ret = -EINVAL;
300 goto cleanup;
301 }
302
303 /* Parse the response */
304
305 net_device->recv_section_cnt = init_packet->msg.
306 v1_msg.send_recv_buf_complete.num_sections;
307
308 net_device->recv_section = kmemdup(
309 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
310 net_device->recv_section_cnt *
311 sizeof(struct nvsp_1_receive_buffer_section),
312 GFP_KERNEL);
313 if (net_device->recv_section == NULL) {
314 ret = -EINVAL;
315 goto cleanup;
316 }
317
318 /*
319 * For 1st release, there should only be 1 section that represents the
320 * entire receive buffer
321 */
322 if (net_device->recv_section_cnt != 1 ||
323 net_device->recv_section->offset != 0) {
324 ret = -EINVAL;
325 goto cleanup;
326 }
327
328 /* Now setup the send buffer.
329 */
330 net_device->send_buf = vzalloc_node(net_device->send_buf_size, node);
331 if (!net_device->send_buf)
332 net_device->send_buf = vzalloc(net_device->send_buf_size);
333 if (!net_device->send_buf) {
334 netdev_err(ndev, "unable to allocate send "
335 "buffer of size %d\n", net_device->send_buf_size);
336 ret = -ENOMEM;
337 goto cleanup;
338 }
339
340 /* Establish the gpadl handle for this buffer on this
341 * channel. Note: This call uses the vmbus connection rather
342 * than the channel to establish the gpadl handle.
343 */
344 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
345 net_device->send_buf_size,
346 &net_device->send_buf_gpadl_handle);
347 if (ret != 0) {
348 netdev_err(ndev,
349 "unable to establish send buffer's gpadl\n");
350 goto cleanup;
351 }
352
353 /* Notify the NetVsp of the gpadl handle */
354 init_packet = &net_device->channel_init_pkt;
355 memset(init_packet, 0, sizeof(struct nvsp_message));
356 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
357 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
358 net_device->send_buf_gpadl_handle;
359 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
360
361 /* Send the gpadl notification request */
362 ret = vmbus_sendpacket(device->channel, init_packet,
363 sizeof(struct nvsp_message),
364 (unsigned long)init_packet,
365 VM_PKT_DATA_INBAND,
366 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
367 if (ret != 0) {
368 netdev_err(ndev,
369 "unable to send send buffer's gpadl to netvsp\n");
370 goto cleanup;
371 }
372
373 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
374 BUG_ON(t == 0);
375
376 /* Check the response */
377 if (init_packet->msg.v1_msg.
378 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
379 netdev_err(ndev, "Unable to complete send buffer "
380 "initialization with NetVsp - status %d\n",
381 init_packet->msg.v1_msg.
382 send_send_buf_complete.status);
383 ret = -EINVAL;
384 goto cleanup;
385 }
386
387 /* Parse the response */
388 net_device->send_section_size = init_packet->msg.
389 v1_msg.send_send_buf_complete.section_size;
390
391 /* Section count is simply the size divided by the section size.
392 */
393 net_device->send_section_cnt =
394 net_device->send_buf_size/net_device->send_section_size;
395
396 dev_info(&device->device, "Send section size: %d, Section count:%d\n",
397 net_device->send_section_size, net_device->send_section_cnt);
398
399 /* Setup state for managing the send buffer. */
400 net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt,
401 BITS_PER_LONG);
402
403 net_device->send_section_map =
404 kzalloc(net_device->map_words * sizeof(ulong), GFP_KERNEL);
405 if (net_device->send_section_map == NULL) {
406 ret = -ENOMEM;
407 goto cleanup;
408 }
409
410 goto exit;
411
412 cleanup:
413 netvsc_destroy_buf(net_device);
414
415 exit:
416 return ret;
417 }
418
419
420 /* Negotiate NVSP protocol version */
421 static int negotiate_nvsp_ver(struct hv_device *device,
422 struct netvsc_device *net_device,
423 struct nvsp_message *init_packet,
424 u32 nvsp_ver)
425 {
426 int ret;
427 unsigned long t;
428
429 memset(init_packet, 0, sizeof(struct nvsp_message));
430 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
431 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
432 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
433
434 /* Send the init request */
435 ret = vmbus_sendpacket(device->channel, init_packet,
436 sizeof(struct nvsp_message),
437 (unsigned long)init_packet,
438 VM_PKT_DATA_INBAND,
439 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
440
441 if (ret != 0)
442 return ret;
443
444 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
445
446 if (t == 0)
447 return -ETIMEDOUT;
448
449 if (init_packet->msg.init_msg.init_complete.status !=
450 NVSP_STAT_SUCCESS)
451 return -EINVAL;
452
453 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
454 return 0;
455
456 /* NVSPv2 or later: Send NDIS config */
457 memset(init_packet, 0, sizeof(struct nvsp_message));
458 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
459 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu +
460 ETH_HLEN;
461 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
462
463 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5)
464 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
465
466 ret = vmbus_sendpacket(device->channel, init_packet,
467 sizeof(struct nvsp_message),
468 (unsigned long)init_packet,
469 VM_PKT_DATA_INBAND, 0);
470
471 return ret;
472 }
473
474 static int netvsc_connect_vsp(struct hv_device *device)
475 {
476 int ret;
477 struct netvsc_device *net_device;
478 struct nvsp_message *init_packet;
479 int ndis_version;
480 struct net_device *ndev;
481 u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
482 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 };
483 int i, num_ver = 4; /* number of different NVSP versions */
484
485 net_device = get_outbound_net_device(device);
486 if (!net_device)
487 return -ENODEV;
488 ndev = net_device->ndev;
489
490 init_packet = &net_device->channel_init_pkt;
491
492 /* Negotiate the latest NVSP protocol supported */
493 for (i = num_ver - 1; i >= 0; i--)
494 if (negotiate_nvsp_ver(device, net_device, init_packet,
495 ver_list[i]) == 0) {
496 net_device->nvsp_version = ver_list[i];
497 break;
498 }
499
500 if (i < 0) {
501 ret = -EPROTO;
502 goto cleanup;
503 }
504
505 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
506
507 /* Send the ndis version */
508 memset(init_packet, 0, sizeof(struct nvsp_message));
509
510 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
511 ndis_version = 0x00060001;
512 else
513 ndis_version = 0x0006001e;
514
515 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
516 init_packet->msg.v1_msg.
517 send_ndis_ver.ndis_major_ver =
518 (ndis_version & 0xFFFF0000) >> 16;
519 init_packet->msg.v1_msg.
520 send_ndis_ver.ndis_minor_ver =
521 ndis_version & 0xFFFF;
522
523 /* Send the init request */
524 ret = vmbus_sendpacket(device->channel, init_packet,
525 sizeof(struct nvsp_message),
526 (unsigned long)init_packet,
527 VM_PKT_DATA_INBAND, 0);
528 if (ret != 0)
529 goto cleanup;
530
531 /* Post the big receive buffer to NetVSP */
532 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
533 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
534 else
535 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
536 net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE;
537
538 ret = netvsc_init_buf(device);
539
540 cleanup:
541 return ret;
542 }
543
544 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
545 {
546 netvsc_destroy_buf(net_device);
547 }
548
549 /*
550 * netvsc_device_remove - Callback when the root bus device is removed
551 */
552 int netvsc_device_remove(struct hv_device *device)
553 {
554 struct netvsc_device *net_device;
555 unsigned long flags;
556
557 net_device = hv_get_drvdata(device);
558
559 netvsc_disconnect_vsp(net_device);
560
561 /*
562 * Since we have already drained, we don't need to busy wait
563 * as was done in final_release_stor_device()
564 * Note that we cannot set the ext pointer to NULL until
565 * we have drained - to drain the outgoing packets, we need to
566 * allow incoming packets.
567 */
568
569 spin_lock_irqsave(&device->channel->inbound_lock, flags);
570 hv_set_drvdata(device, NULL);
571 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
572
573 /*
574 * At this point, no one should be accessing net_device
575 * except in here
576 */
577 dev_notice(&device->device, "net device safe to remove\n");
578
579 /* Now, we can close the channel safely */
580 vmbus_close(device->channel);
581
582 /* Release all resources */
583 vfree(net_device->sub_cb_buf);
584 free_netvsc_device(net_device);
585 return 0;
586 }
587
588
589 #define RING_AVAIL_PERCENT_HIWATER 20
590 #define RING_AVAIL_PERCENT_LOWATER 10
591
592 /*
593 * Get the percentage of available bytes to write in the ring.
594 * The return value is in range from 0 to 100.
595 */
596 static inline u32 hv_ringbuf_avail_percent(
597 struct hv_ring_buffer_info *ring_info)
598 {
599 u32 avail_read, avail_write;
600
601 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
602
603 return avail_write * 100 / ring_info->ring_datasize;
604 }
605
606 static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
607 u32 index)
608 {
609 sync_change_bit(index, net_device->send_section_map);
610 }
611
612 static void netvsc_send_completion(struct netvsc_device *net_device,
613 struct vmbus_channel *incoming_channel,
614 struct hv_device *device,
615 struct vmpacket_descriptor *packet)
616 {
617 struct nvsp_message *nvsp_packet;
618 struct hv_netvsc_packet *nvsc_packet;
619 struct net_device *ndev;
620 u32 send_index;
621
622 ndev = net_device->ndev;
623
624 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
625 (packet->offset8 << 3));
626
627 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
628 (nvsp_packet->hdr.msg_type ==
629 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
630 (nvsp_packet->hdr.msg_type ==
631 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) ||
632 (nvsp_packet->hdr.msg_type ==
633 NVSP_MSG5_TYPE_SUBCHANNEL)) {
634 /* Copy the response back */
635 memcpy(&net_device->channel_init_pkt, nvsp_packet,
636 sizeof(struct nvsp_message));
637 complete(&net_device->channel_init_wait);
638 } else if (nvsp_packet->hdr.msg_type ==
639 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
640 int num_outstanding_sends;
641 u16 q_idx = 0;
642 struct vmbus_channel *channel = device->channel;
643 int queue_sends;
644
645 /* Get the send context */
646 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
647 packet->trans_id;
648
649 /* Notify the layer above us */
650 if (nvsc_packet) {
651 send_index = nvsc_packet->send_buf_index;
652 if (send_index != NETVSC_INVALID_INDEX)
653 netvsc_free_send_slot(net_device, send_index);
654 q_idx = nvsc_packet->q_idx;
655 channel = incoming_channel;
656 nvsc_packet->send_completion(nvsc_packet->
657 send_completion_ctx);
658 }
659
660 num_outstanding_sends =
661 atomic_dec_return(&net_device->num_outstanding_sends);
662 queue_sends = atomic_dec_return(&net_device->
663 queue_sends[q_idx]);
664
665 if (net_device->destroy && num_outstanding_sends == 0)
666 wake_up(&net_device->wait_drain);
667
668 if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
669 !net_device->start_remove &&
670 (hv_ringbuf_avail_percent(&channel->outbound) >
671 RING_AVAIL_PERCENT_HIWATER || queue_sends < 1))
672 netif_tx_wake_queue(netdev_get_tx_queue(
673 ndev, q_idx));
674 } else {
675 netdev_err(ndev, "Unknown send completion packet type- "
676 "%d received!!\n", nvsp_packet->hdr.msg_type);
677 }
678
679 }
680
681 static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
682 {
683 unsigned long index;
684 u32 max_words = net_device->map_words;
685 unsigned long *map_addr = (unsigned long *)net_device->send_section_map;
686 u32 section_cnt = net_device->send_section_cnt;
687 int ret_val = NETVSC_INVALID_INDEX;
688 int i;
689 int prev_val;
690
691 for (i = 0; i < max_words; i++) {
692 if (!~(map_addr[i]))
693 continue;
694 index = ffz(map_addr[i]);
695 prev_val = sync_test_and_set_bit(index, &map_addr[i]);
696 if (prev_val)
697 continue;
698 if ((index + (i * BITS_PER_LONG)) >= section_cnt)
699 break;
700 ret_val = (index + (i * BITS_PER_LONG));
701 break;
702 }
703 return ret_val;
704 }
705
706 static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
707 unsigned int section_index,
708 u32 pend_size,
709 struct hv_netvsc_packet *packet,
710 struct rndis_message *rndis_msg)
711 {
712 char *start = net_device->send_buf;
713 char *dest = start + (section_index * net_device->send_section_size)
714 + pend_size;
715 int i;
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 (packet->is_data_pkt && packet->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(packet->page_buf[i].pfn << PAGE_SHIFT);
732 u32 offset = packet->page_buf[i].offset;
733 u32 len = packet->page_buf[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
748 static inline int netvsc_send_pkt(
749 struct hv_netvsc_packet *packet,
750 struct netvsc_device *net_device)
751 {
752 struct nvsp_message nvmsg;
753 struct vmbus_channel *out_channel = get_channel(packet, net_device);
754 u16 q_idx = packet->q_idx;
755 struct net_device *ndev = net_device->ndev;
756 u64 req_id;
757 int ret;
758 struct hv_page_buffer *pgbuf;
759 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
760
761 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
762 if (packet->is_data_pkt) {
763 /* 0 is RMC_DATA; */
764 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0;
765 } else {
766 /* 1 is RMC_CONTROL; */
767 nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1;
768 }
769
770 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
771 packet->send_buf_index;
772 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
773 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
774 else
775 nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size =
776 packet->total_data_buflen;
777
778 if (packet->send_completion)
779 req_id = (ulong)packet;
780 else
781 req_id = 0;
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 packet->xmit_more = false;
795
796 if (packet->page_buf_cnt) {
797 pgbuf = packet->cp_partial ? packet->page_buf +
798 packet->rmsg_pgcnt : packet->page_buf;
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 !packet->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 !packet->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 int netvsc_send(struct hv_device *device,
845 struct hv_netvsc_packet *packet,
846 struct rndis_message *rndis_msg)
847 {
848 struct netvsc_device *net_device;
849 int ret = 0, m_ret = 0;
850 struct vmbus_channel *out_channel;
851 u16 q_idx = packet->q_idx;
852 u32 pktlen = packet->total_data_buflen, msd_len = 0;
853 unsigned int section_index = NETVSC_INVALID_INDEX;
854 unsigned long flag;
855 struct multi_send_data *msdp;
856 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
857 bool try_batch;
858
859 net_device = get_outbound_net_device(device);
860 if (!net_device)
861 return -ENODEV;
862
863 out_channel = get_channel(packet, net_device);
864 q_idx = packet->q_idx;
865
866 packet->send_buf_index = NETVSC_INVALID_INDEX;
867 packet->cp_partial = false;
868
869 msdp = &net_device->msd[q_idx];
870
871 /* batch packets in send buffer if possible */
872 spin_lock_irqsave(&msdp->lock, flag);
873 if (msdp->pkt)
874 msd_len = msdp->pkt->total_data_buflen;
875
876 try_batch = packet->is_data_pkt && msd_len > 0 && msdp->count <
877 net_device->max_pkt;
878
879 if (try_batch && msd_len + pktlen + net_device->pkt_align <
880 net_device->send_section_size) {
881 section_index = msdp->pkt->send_buf_index;
882
883 } else if (try_batch && msd_len + packet->rmsg_size <
884 net_device->send_section_size) {
885 section_index = msdp->pkt->send_buf_index;
886 packet->cp_partial = true;
887
888 } else if (packet->is_data_pkt && pktlen + net_device->pkt_align <
889 net_device->send_section_size) {
890 section_index = netvsc_get_next_send_section(net_device);
891 if (section_index != NETVSC_INVALID_INDEX) {
892 msd_send = msdp->pkt;
893 msdp->pkt = NULL;
894 msdp->count = 0;
895 msd_len = 0;
896 }
897 }
898
899 if (section_index != NETVSC_INVALID_INDEX) {
900 netvsc_copy_to_send_buf(net_device,
901 section_index, msd_len,
902 packet, rndis_msg);
903
904 packet->send_buf_index = section_index;
905
906 if (packet->cp_partial) {
907 packet->page_buf_cnt -= packet->rmsg_pgcnt;
908 packet->total_data_buflen = msd_len + packet->rmsg_size;
909 } else {
910 packet->page_buf_cnt = 0;
911 packet->total_data_buflen += msd_len;
912 }
913
914 if (msdp->pkt)
915 netvsc_xmit_completion(msdp->pkt);
916
917 if (packet->xmit_more && !packet->cp_partial) {
918 msdp->pkt = packet;
919 msdp->count++;
920 } else {
921 cur_send = packet;
922 msdp->pkt = NULL;
923 msdp->count = 0;
924 }
925 } else {
926 msd_send = msdp->pkt;
927 msdp->pkt = NULL;
928 msdp->count = 0;
929 cur_send = packet;
930 }
931
932 spin_unlock_irqrestore(&msdp->lock, flag);
933
934 if (msd_send) {
935 m_ret = netvsc_send_pkt(msd_send, net_device);
936
937 if (m_ret != 0) {
938 netvsc_free_send_slot(net_device,
939 msd_send->send_buf_index);
940 netvsc_xmit_completion(msd_send);
941 }
942 }
943
944 if (cur_send)
945 ret = netvsc_send_pkt(cur_send, net_device);
946
947 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
948 netvsc_free_send_slot(net_device, section_index);
949
950 return ret;
951 }
952
953 static void netvsc_send_recv_completion(struct hv_device *device,
954 struct vmbus_channel *channel,
955 struct netvsc_device *net_device,
956 u64 transaction_id, u32 status)
957 {
958 struct nvsp_message recvcompMessage;
959 int retries = 0;
960 int ret;
961 struct net_device *ndev;
962
963 ndev = net_device->ndev;
964
965 recvcompMessage.hdr.msg_type =
966 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
967
968 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status;
969
970 retry_send_cmplt:
971 /* Send the completion */
972 ret = vmbus_sendpacket(channel, &recvcompMessage,
973 sizeof(struct nvsp_message), transaction_id,
974 VM_PKT_COMP, 0);
975 if (ret == 0) {
976 /* success */
977 /* no-op */
978 } else if (ret == -EAGAIN) {
979 /* no more room...wait a bit and attempt to retry 3 times */
980 retries++;
981 netdev_err(ndev, "unable to send receive completion pkt"
982 " (tid %llx)...retrying %d\n", transaction_id, retries);
983
984 if (retries < 4) {
985 udelay(100);
986 goto retry_send_cmplt;
987 } else {
988 netdev_err(ndev, "unable to send receive "
989 "completion pkt (tid %llx)...give up retrying\n",
990 transaction_id);
991 }
992 } else {
993 netdev_err(ndev, "unable to send receive "
994 "completion pkt - %llx\n", transaction_id);
995 }
996 }
997
998 static void netvsc_receive(struct netvsc_device *net_device,
999 struct vmbus_channel *channel,
1000 struct hv_device *device,
1001 struct vmpacket_descriptor *packet)
1002 {
1003 struct vmtransfer_page_packet_header *vmxferpage_packet;
1004 struct nvsp_message *nvsp_packet;
1005 struct hv_netvsc_packet nv_pkt;
1006 struct hv_netvsc_packet *netvsc_packet = &nv_pkt;
1007 u32 status = NVSP_STAT_SUCCESS;
1008 int i;
1009 int count = 0;
1010 struct net_device *ndev;
1011
1012 ndev = net_device->ndev;
1013
1014 /*
1015 * All inbound packets other than send completion should be xfer page
1016 * packet
1017 */
1018 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
1019 netdev_err(ndev, "Unknown packet type received - %d\n",
1020 packet->type);
1021 return;
1022 }
1023
1024 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
1025 (packet->offset8 << 3));
1026
1027 /* Make sure this is a valid nvsp packet */
1028 if (nvsp_packet->hdr.msg_type !=
1029 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
1030 netdev_err(ndev, "Unknown nvsp packet type received-"
1031 " %d\n", nvsp_packet->hdr.msg_type);
1032 return;
1033 }
1034
1035 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
1036
1037 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
1038 netdev_err(ndev, "Invalid xfer page set id - "
1039 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
1040 vmxferpage_packet->xfer_pageset_id);
1041 return;
1042 }
1043
1044 count = vmxferpage_packet->range_cnt;
1045
1046 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1047 for (i = 0; i < count; i++) {
1048 /* Initialize the netvsc packet */
1049 netvsc_packet->status = NVSP_STAT_SUCCESS;
1050 netvsc_packet->data = (void *)((unsigned long)net_device->
1051 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
1052 netvsc_packet->total_data_buflen =
1053 vmxferpage_packet->ranges[i].byte_count;
1054
1055 /* Pass it to the upper layer */
1056 rndis_filter_receive(device, netvsc_packet, channel);
1057
1058 if (netvsc_packet->status != NVSP_STAT_SUCCESS)
1059 status = NVSP_STAT_FAIL;
1060 }
1061
1062 netvsc_send_recv_completion(device, channel, net_device,
1063 vmxferpage_packet->d.trans_id, status);
1064 }
1065
1066
1067 static void netvsc_send_table(struct hv_device *hdev,
1068 struct nvsp_message *nvmsg)
1069 {
1070 struct netvsc_device *nvscdev;
1071 struct net_device *ndev;
1072 int i;
1073 u32 count, *tab;
1074
1075 nvscdev = get_outbound_net_device(hdev);
1076 if (!nvscdev)
1077 return;
1078 ndev = nvscdev->ndev;
1079
1080 count = nvmsg->msg.v5_msg.send_table.count;
1081 if (count != VRSS_SEND_TAB_SIZE) {
1082 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1083 return;
1084 }
1085
1086 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
1087 nvmsg->msg.v5_msg.send_table.offset);
1088
1089 for (i = 0; i < count; i++)
1090 nvscdev->send_table[i] = tab[i];
1091 }
1092
1093 static void netvsc_send_vf(struct netvsc_device *nvdev,
1094 struct nvsp_message *nvmsg)
1095 {
1096 nvdev->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1097 nvdev->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1098 }
1099
1100 static inline void netvsc_receive_inband(struct hv_device *hdev,
1101 struct netvsc_device *nvdev,
1102 struct nvsp_message *nvmsg)
1103 {
1104 switch (nvmsg->hdr.msg_type) {
1105 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1106 netvsc_send_table(hdev, nvmsg);
1107 break;
1108
1109 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1110 netvsc_send_vf(nvdev, nvmsg);
1111 break;
1112 }
1113 }
1114
1115 void netvsc_channel_cb(void *context)
1116 {
1117 int ret;
1118 struct vmbus_channel *channel = (struct vmbus_channel *)context;
1119 struct hv_device *device;
1120 struct netvsc_device *net_device;
1121 u32 bytes_recvd;
1122 u64 request_id;
1123 struct vmpacket_descriptor *desc;
1124 unsigned char *buffer;
1125 int bufferlen = NETVSC_PACKET_SIZE;
1126 struct net_device *ndev;
1127 struct nvsp_message *nvmsg;
1128
1129 if (channel->primary_channel != NULL)
1130 device = channel->primary_channel->device_obj;
1131 else
1132 device = channel->device_obj;
1133
1134 net_device = get_inbound_net_device(device);
1135 if (!net_device)
1136 return;
1137 ndev = net_device->ndev;
1138 buffer = get_per_channel_state(channel);
1139
1140 do {
1141 ret = vmbus_recvpacket_raw(channel, buffer, bufferlen,
1142 &bytes_recvd, &request_id);
1143 if (ret == 0) {
1144 if (bytes_recvd > 0) {
1145 desc = (struct vmpacket_descriptor *)buffer;
1146 nvmsg = (struct nvsp_message *)((unsigned long)
1147 desc + (desc->offset8 << 3));
1148 switch (desc->type) {
1149 case VM_PKT_COMP:
1150 netvsc_send_completion(net_device,
1151 channel,
1152 device, desc);
1153 break;
1154
1155 case VM_PKT_DATA_USING_XFER_PAGES:
1156 netvsc_receive(net_device, channel,
1157 device, desc);
1158 break;
1159
1160 case VM_PKT_DATA_INBAND:
1161 netvsc_receive_inband(device,
1162 net_device,
1163 nvmsg);
1164 break;
1165
1166 default:
1167 netdev_err(ndev,
1168 "unhandled packet type %d, "
1169 "tid %llx len %d\n",
1170 desc->type, request_id,
1171 bytes_recvd);
1172 break;
1173 }
1174
1175 } else {
1176 /*
1177 * We are done for this pass.
1178 */
1179 break;
1180 }
1181
1182 } else if (ret == -ENOBUFS) {
1183 if (bufferlen > NETVSC_PACKET_SIZE)
1184 kfree(buffer);
1185 /* Handle large packet */
1186 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
1187 if (buffer == NULL) {
1188 /* Try again next time around */
1189 netdev_err(ndev,
1190 "unable to allocate buffer of size "
1191 "(%d)!!\n", bytes_recvd);
1192 break;
1193 }
1194
1195 bufferlen = bytes_recvd;
1196 }
1197 } while (1);
1198
1199 if (bufferlen > NETVSC_PACKET_SIZE)
1200 kfree(buffer);
1201 return;
1202 }
1203
1204 /*
1205 * netvsc_device_add - Callback when the device belonging to this
1206 * driver is added
1207 */
1208 int netvsc_device_add(struct hv_device *device, void *additional_info)
1209 {
1210 int ret = 0;
1211 int ring_size =
1212 ((struct netvsc_device_info *)additional_info)->ring_size;
1213 struct netvsc_device *net_device;
1214 struct net_device *ndev;
1215
1216 net_device = alloc_net_device(device);
1217 if (!net_device)
1218 return -ENOMEM;
1219
1220 net_device->ring_size = ring_size;
1221
1222 /*
1223 * Coming into this function, struct net_device * is
1224 * registered as the driver private data.
1225 * In alloc_net_device(), we register struct netvsc_device *
1226 * as the driver private data and stash away struct net_device *
1227 * in struct netvsc_device *.
1228 */
1229 ndev = net_device->ndev;
1230
1231 /* Add netvsc_device context to netvsc_device */
1232 net_device->nd_ctx = netdev_priv(ndev);
1233
1234 /* Initialize the NetVSC channel extension */
1235 init_completion(&net_device->channel_init_wait);
1236
1237 set_per_channel_state(device->channel, net_device->cb_buffer);
1238
1239 /* Open the channel */
1240 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
1241 ring_size * PAGE_SIZE, NULL, 0,
1242 netvsc_channel_cb, device->channel);
1243
1244 if (ret != 0) {
1245 netdev_err(ndev, "unable to open channel: %d\n", ret);
1246 goto cleanup;
1247 }
1248
1249 /* Channel is opened */
1250 pr_info("hv_netvsc channel opened successfully\n");
1251
1252 net_device->chn_table[0] = device->channel;
1253
1254 /* Connect with the NetVsp */
1255 ret = netvsc_connect_vsp(device);
1256 if (ret != 0) {
1257 netdev_err(ndev,
1258 "unable to connect to NetVSP - %d\n", ret);
1259 goto close;
1260 }
1261
1262 return ret;
1263
1264 close:
1265 /* Now, we can close the channel safely */
1266 vmbus_close(device->channel);
1267
1268 cleanup:
1269 free_netvsc_device(net_device);
1270
1271 return ret;
1272 }
Linux kernel - Deliverables
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