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, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/wait.h>
26 #include <linux/mm.h>
27 #include <linux/delay.h>
28 #include <linux/io.h>
29 #include <linux/slab.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_ether.h>
32
33 #include "hyperv_net.h"
34
35
alloc_net_device(struct hv_device * device)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 net_device->start_remove = false;
46 net_device->destroy = false;
47 net_device->dev = device;
48 net_device->ndev = ndev;
49
50 hv_set_drvdata(device, net_device);
51 return net_device;
52 }
53
get_outbound_net_device(struct hv_device * device)54 static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
55 {
56 struct netvsc_device *net_device;
57
58 net_device = hv_get_drvdata(device);
59 if (net_device && net_device->destroy)
60 net_device = NULL;
61
62 return net_device;
63 }
64
get_inbound_net_device(struct hv_device * device)65 static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
66 {
67 struct netvsc_device *net_device;
68
69 net_device = hv_get_drvdata(device);
70
71 if (!net_device)
72 goto get_in_err;
73
74 if (net_device->destroy &&
75 atomic_read(&net_device->num_outstanding_sends) == 0)
76 net_device = NULL;
77
78 get_in_err:
79 return net_device;
80 }
81
82
netvsc_destroy_recv_buf(struct netvsc_device * net_device)83 static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
84 {
85 struct nvsp_message *revoke_packet;
86 int ret = 0;
87 struct net_device *ndev = net_device->ndev;
88
89 /*
90 * If we got a section count, it means we received a
91 * SendReceiveBufferComplete msg (ie sent
92 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
93 * to send a revoke msg here
94 */
95 if (net_device->recv_section_cnt) {
96 /* Send the revoke receive buffer */
97 revoke_packet = &net_device->revoke_packet;
98 memset(revoke_packet, 0, sizeof(struct nvsp_message));
99
100 revoke_packet->hdr.msg_type =
101 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
102 revoke_packet->msg.v1_msg.
103 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
104
105 ret = vmbus_sendpacket(net_device->dev->channel,
106 revoke_packet,
107 sizeof(struct nvsp_message),
108 (unsigned long)revoke_packet,
109 VM_PKT_DATA_INBAND, 0);
110 /*
111 * If we failed here, we might as well return and
112 * have a leak rather than continue and a bugchk
113 */
114 if (ret != 0) {
115 netdev_err(ndev, "unable to send "
116 "revoke receive buffer to netvsp\n");
117 return ret;
118 }
119 }
120
121 /* Teardown the gpadl on the vsp end */
122 if (net_device->recv_buf_gpadl_handle) {
123 ret = vmbus_teardown_gpadl(net_device->dev->channel,
124 net_device->recv_buf_gpadl_handle);
125
126 /* If we failed here, we might as well return and have a leak
127 * rather than continue and a bugchk
128 */
129 if (ret != 0) {
130 netdev_err(ndev,
131 "unable to teardown receive buffer's gpadl\n");
132 return ret;
133 }
134 net_device->recv_buf_gpadl_handle = 0;
135 }
136
137 if (net_device->recv_buf) {
138 /* Free up the receive buffer */
139 free_pages((unsigned long)net_device->recv_buf,
140 get_order(net_device->recv_buf_size));
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 return ret;
151 }
152
netvsc_init_recv_buf(struct hv_device * device)153 static int netvsc_init_recv_buf(struct hv_device *device)
154 {
155 int ret = 0;
156 int t;
157 struct netvsc_device *net_device;
158 struct nvsp_message *init_packet;
159 struct net_device *ndev;
160
161 net_device = get_outbound_net_device(device);
162 if (!net_device)
163 return -ENODEV;
164 ndev = net_device->ndev;
165
166 net_device->recv_buf =
167 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
168 get_order(net_device->recv_buf_size));
169 if (!net_device->recv_buf) {
170 netdev_err(ndev, "unable to allocate receive "
171 "buffer of size %d\n", net_device->recv_buf_size);
172 ret = -ENOMEM;
173 goto cleanup;
174 }
175
176 /*
177 * Establish the gpadl handle for this buffer on this
178 * channel. Note: This call uses the vmbus connection rather
179 * than the channel to establish the gpadl handle.
180 */
181 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
182 net_device->recv_buf_size,
183 &net_device->recv_buf_gpadl_handle);
184 if (ret != 0) {
185 netdev_err(ndev,
186 "unable to establish receive buffer's gpadl\n");
187 goto cleanup;
188 }
189
190
191 /* Notify the NetVsp of the gpadl handle */
192 init_packet = &net_device->channel_init_pkt;
193
194 memset(init_packet, 0, sizeof(struct nvsp_message));
195
196 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
197 init_packet->msg.v1_msg.send_recv_buf.
198 gpadl_handle = net_device->recv_buf_gpadl_handle;
199 init_packet->msg.v1_msg.
200 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
201
202 /* Send the gpadl notification request */
203 ret = vmbus_sendpacket(device->channel, init_packet,
204 sizeof(struct nvsp_message),
205 (unsigned long)init_packet,
206 VM_PKT_DATA_INBAND,
207 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
208 if (ret != 0) {
209 netdev_err(ndev,
210 "unable to send receive buffer's gpadl to netvsp\n");
211 goto cleanup;
212 }
213
214 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
215 BUG_ON(t == 0);
216
217
218 /* Check the response */
219 if (init_packet->msg.v1_msg.
220 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
221 netdev_err(ndev, "Unable to complete receive buffer "
222 "initialization with NetVsp - status %d\n",
223 init_packet->msg.v1_msg.
224 send_recv_buf_complete.status);
225 ret = -EINVAL;
226 goto cleanup;
227 }
228
229 /* Parse the response */
230
231 net_device->recv_section_cnt = init_packet->msg.
232 v1_msg.send_recv_buf_complete.num_sections;
233
234 net_device->recv_section = kmemdup(
235 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
236 net_device->recv_section_cnt *
237 sizeof(struct nvsp_1_receive_buffer_section),
238 GFP_KERNEL);
239 if (net_device->recv_section == NULL) {
240 ret = -EINVAL;
241 goto cleanup;
242 }
243
244 /*
245 * For 1st release, there should only be 1 section that represents the
246 * entire receive buffer
247 */
248 if (net_device->recv_section_cnt != 1 ||
249 net_device->recv_section->offset != 0) {
250 ret = -EINVAL;
251 goto cleanup;
252 }
253
254 goto exit;
255
256 cleanup:
257 netvsc_destroy_recv_buf(net_device);
258
259 exit:
260 return ret;
261 }
262
263
264 /* Negotiate NVSP protocol version */
negotiate_nvsp_ver(struct hv_device * device,struct netvsc_device * net_device,struct nvsp_message * init_packet,u32 nvsp_ver)265 static int negotiate_nvsp_ver(struct hv_device *device,
266 struct netvsc_device *net_device,
267 struct nvsp_message *init_packet,
268 u32 nvsp_ver)
269 {
270 int ret, t;
271
272 memset(init_packet, 0, sizeof(struct nvsp_message));
273 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
274 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
275 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
276
277 /* Send the init request */
278 ret = vmbus_sendpacket(device->channel, init_packet,
279 sizeof(struct nvsp_message),
280 (unsigned long)init_packet,
281 VM_PKT_DATA_INBAND,
282 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
283
284 if (ret != 0)
285 return ret;
286
287 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
288
289 if (t == 0)
290 return -ETIMEDOUT;
291
292 if (init_packet->msg.init_msg.init_complete.status !=
293 NVSP_STAT_SUCCESS)
294 return -EINVAL;
295
296 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
297 return 0;
298
299 /* NVSPv2 only: Send NDIS config */
300 memset(init_packet, 0, sizeof(struct nvsp_message));
301 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
302 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
303
304 ret = vmbus_sendpacket(device->channel, init_packet,
305 sizeof(struct nvsp_message),
306 (unsigned long)init_packet,
307 VM_PKT_DATA_INBAND, 0);
308
309 return ret;
310 }
311
netvsc_connect_vsp(struct hv_device * device)312 static int netvsc_connect_vsp(struct hv_device *device)
313 {
314 int ret;
315 struct netvsc_device *net_device;
316 struct nvsp_message *init_packet;
317 int ndis_version;
318 struct net_device *ndev;
319
320 net_device = get_outbound_net_device(device);
321 if (!net_device)
322 return -ENODEV;
323 ndev = net_device->ndev;
324
325 init_packet = &net_device->channel_init_pkt;
326
327 /* Negotiate the latest NVSP protocol supported */
328 if (negotiate_nvsp_ver(device, net_device, init_packet,
329 NVSP_PROTOCOL_VERSION_2) == 0) {
330 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
331 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
332 NVSP_PROTOCOL_VERSION_1) == 0) {
333 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
334 } else {
335 ret = -EPROTO;
336 goto cleanup;
337 }
338
339 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
340
341 /* Send the ndis version */
342 memset(init_packet, 0, sizeof(struct nvsp_message));
343
344 ndis_version = 0x00050000;
345
346 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
347 init_packet->msg.v1_msg.
348 send_ndis_ver.ndis_major_ver =
349 (ndis_version & 0xFFFF0000) >> 16;
350 init_packet->msg.v1_msg.
351 send_ndis_ver.ndis_minor_ver =
352 ndis_version & 0xFFFF;
353
354 /* Send the init request */
355 ret = vmbus_sendpacket(device->channel, init_packet,
356 sizeof(struct nvsp_message),
357 (unsigned long)init_packet,
358 VM_PKT_DATA_INBAND, 0);
359 if (ret != 0)
360 goto cleanup;
361
362 /* Post the big receive buffer to NetVSP */
363 ret = netvsc_init_recv_buf(device);
364
365 cleanup:
366 return ret;
367 }
368
netvsc_disconnect_vsp(struct netvsc_device * net_device)369 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
370 {
371 netvsc_destroy_recv_buf(net_device);
372 }
373
374 /*
375 * netvsc_device_remove - Callback when the root bus device is removed
376 */
netvsc_device_remove(struct hv_device * device)377 int netvsc_device_remove(struct hv_device *device)
378 {
379 struct netvsc_device *net_device;
380 struct hv_netvsc_packet *netvsc_packet, *pos;
381 unsigned long flags;
382
383 net_device = hv_get_drvdata(device);
384 spin_lock_irqsave(&device->channel->inbound_lock, flags);
385 net_device->destroy = true;
386 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
387
388 /* Wait for all send completions */
389 while (atomic_read(&net_device->num_outstanding_sends)) {
390 dev_info(&device->device,
391 "waiting for %d requests to complete...\n",
392 atomic_read(&net_device->num_outstanding_sends));
393 udelay(100);
394 }
395
396 netvsc_disconnect_vsp(net_device);
397
398 /*
399 * Since we have already drained, we don't need to busy wait
400 * as was done in final_release_stor_device()
401 * Note that we cannot set the ext pointer to NULL until
402 * we have drained - to drain the outgoing packets, we need to
403 * allow incoming packets.
404 */
405
406 spin_lock_irqsave(&device->channel->inbound_lock, flags);
407 hv_set_drvdata(device, NULL);
408 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
409
410 /*
411 * At this point, no one should be accessing net_device
412 * except in here
413 */
414 dev_notice(&device->device, "net device safe to remove\n");
415
416 /* Now, we can close the channel safely */
417 vmbus_close(device->channel);
418
419 /* Release all resources */
420 list_for_each_entry_safe(netvsc_packet, pos,
421 &net_device->recv_pkt_list, list_ent) {
422 list_del(&netvsc_packet->list_ent);
423 kfree(netvsc_packet);
424 }
425
426 kfree(net_device);
427 return 0;
428 }
429
netvsc_send_completion(struct hv_device * device,struct vmpacket_descriptor * packet)430 static void netvsc_send_completion(struct hv_device *device,
431 struct vmpacket_descriptor *packet)
432 {
433 struct netvsc_device *net_device;
434 struct nvsp_message *nvsp_packet;
435 struct hv_netvsc_packet *nvsc_packet;
436 struct net_device *ndev;
437
438 net_device = get_inbound_net_device(device);
439 if (!net_device)
440 return;
441 ndev = net_device->ndev;
442
443 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
444 (packet->offset8 << 3));
445
446 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
447 (nvsp_packet->hdr.msg_type ==
448 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
449 (nvsp_packet->hdr.msg_type ==
450 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
451 /* Copy the response back */
452 memcpy(&net_device->channel_init_pkt, nvsp_packet,
453 sizeof(struct nvsp_message));
454 complete(&net_device->channel_init_wait);
455 } else if (nvsp_packet->hdr.msg_type ==
456 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
457 /* Get the send context */
458 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
459 packet->trans_id;
460
461 /* Notify the layer above us */
462 nvsc_packet->completion.send.send_completion(
463 nvsc_packet->completion.send.send_completion_ctx);
464
465 atomic_dec(&net_device->num_outstanding_sends);
466
467 if (netif_queue_stopped(ndev) && !net_device->start_remove)
468 netif_wake_queue(ndev);
469 } else {
470 netdev_err(ndev, "Unknown send completion packet type- "
471 "%d received!!\n", nvsp_packet->hdr.msg_type);
472 }
473
474 }
475
netvsc_send(struct hv_device * device,struct hv_netvsc_packet * packet)476 int netvsc_send(struct hv_device *device,
477 struct hv_netvsc_packet *packet)
478 {
479 struct netvsc_device *net_device;
480 int ret = 0;
481 struct nvsp_message sendMessage;
482 struct net_device *ndev;
483
484 net_device = get_outbound_net_device(device);
485 if (!net_device)
486 return -ENODEV;
487 ndev = net_device->ndev;
488
489 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
490 if (packet->is_data_pkt) {
491 /* 0 is RMC_DATA; */
492 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
493 } else {
494 /* 1 is RMC_CONTROL; */
495 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
496 }
497
498 /* Not using send buffer section */
499 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
500 0xFFFFFFFF;
501 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
502
503 if (packet->page_buf_cnt) {
504 ret = vmbus_sendpacket_pagebuffer(device->channel,
505 packet->page_buf,
506 packet->page_buf_cnt,
507 &sendMessage,
508 sizeof(struct nvsp_message),
509 (unsigned long)packet);
510 } else {
511 ret = vmbus_sendpacket(device->channel, &sendMessage,
512 sizeof(struct nvsp_message),
513 (unsigned long)packet,
514 VM_PKT_DATA_INBAND,
515 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
516
517 }
518
519 if (ret == 0) {
520 atomic_inc(&net_device->num_outstanding_sends);
521 } else if (ret == -EAGAIN) {
522 netif_stop_queue(ndev);
523 if (atomic_read(&net_device->num_outstanding_sends) < 1)
524 netif_wake_queue(ndev);
525 } else {
526 netdev_err(ndev, "Unable to send packet %p ret %d\n",
527 packet, ret);
528 }
529
530 return ret;
531 }
532
netvsc_send_recv_completion(struct hv_device * device,u64 transaction_id)533 static void netvsc_send_recv_completion(struct hv_device *device,
534 u64 transaction_id)
535 {
536 struct nvsp_message recvcompMessage;
537 int retries = 0;
538 int ret;
539 struct net_device *ndev;
540 struct netvsc_device *net_device = hv_get_drvdata(device);
541
542 ndev = net_device->ndev;
543
544 recvcompMessage.hdr.msg_type =
545 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
546
547 /* FIXME: Pass in the status */
548 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
549 NVSP_STAT_SUCCESS;
550
551 retry_send_cmplt:
552 /* Send the completion */
553 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
554 sizeof(struct nvsp_message), transaction_id,
555 VM_PKT_COMP, 0);
556 if (ret == 0) {
557 /* success */
558 /* no-op */
559 } else if (ret == -EAGAIN) {
560 /* no more room...wait a bit and attempt to retry 3 times */
561 retries++;
562 netdev_err(ndev, "unable to send receive completion pkt"
563 " (tid %llx)...retrying %d\n", transaction_id, retries);
564
565 if (retries < 4) {
566 udelay(100);
567 goto retry_send_cmplt;
568 } else {
569 netdev_err(ndev, "unable to send receive "
570 "completion pkt (tid %llx)...give up retrying\n",
571 transaction_id);
572 }
573 } else {
574 netdev_err(ndev, "unable to send receive "
575 "completion pkt - %llx\n", transaction_id);
576 }
577 }
578
579 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
netvsc_receive_completion(void * context)580 static void netvsc_receive_completion(void *context)
581 {
582 struct hv_netvsc_packet *packet = context;
583 struct hv_device *device = (struct hv_device *)packet->device;
584 struct netvsc_device *net_device;
585 u64 transaction_id = 0;
586 bool fsend_receive_comp = false;
587 unsigned long flags;
588 struct net_device *ndev;
589
590 /*
591 * Even though it seems logical to do a GetOutboundNetDevice() here to
592 * send out receive completion, we are using GetInboundNetDevice()
593 * since we may have disable outbound traffic already.
594 */
595 net_device = get_inbound_net_device(device);
596 if (!net_device)
597 return;
598 ndev = net_device->ndev;
599
600 /* Overloading use of the lock. */
601 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
602
603 packet->xfer_page_pkt->count--;
604
605 /*
606 * Last one in the line that represent 1 xfer page packet.
607 * Return the xfer page packet itself to the freelist
608 */
609 if (packet->xfer_page_pkt->count == 0) {
610 fsend_receive_comp = true;
611 transaction_id = packet->completion.recv.recv_completion_tid;
612 list_add_tail(&packet->xfer_page_pkt->list_ent,
613 &net_device->recv_pkt_list);
614
615 }
616
617 /* Put the packet back */
618 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
619 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
620
621 /* Send a receive completion for the xfer page packet */
622 if (fsend_receive_comp)
623 netvsc_send_recv_completion(device, transaction_id);
624
625 }
626
netvsc_receive(struct hv_device * device,struct vmpacket_descriptor * packet)627 static void netvsc_receive(struct hv_device *device,
628 struct vmpacket_descriptor *packet)
629 {
630 struct netvsc_device *net_device;
631 struct vmtransfer_page_packet_header *vmxferpage_packet;
632 struct nvsp_message *nvsp_packet;
633 struct hv_netvsc_packet *netvsc_packet = NULL;
634 /* struct netvsc_driver *netvscDriver; */
635 struct xferpage_packet *xferpage_packet = NULL;
636 int i;
637 int count = 0;
638 unsigned long flags;
639 struct net_device *ndev;
640
641 LIST_HEAD(listHead);
642
643 net_device = get_inbound_net_device(device);
644 if (!net_device)
645 return;
646 ndev = net_device->ndev;
647
648 /*
649 * All inbound packets other than send completion should be xfer page
650 * packet
651 */
652 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
653 netdev_err(ndev, "Unknown packet type received - %d\n",
654 packet->type);
655 return;
656 }
657
658 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
659 (packet->offset8 << 3));
660
661 /* Make sure this is a valid nvsp packet */
662 if (nvsp_packet->hdr.msg_type !=
663 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
664 netdev_err(ndev, "Unknown nvsp packet type received-"
665 " %d\n", nvsp_packet->hdr.msg_type);
666 return;
667 }
668
669 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
670
671 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
672 netdev_err(ndev, "Invalid xfer page set id - "
673 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
674 vmxferpage_packet->xfer_pageset_id);
675 return;
676 }
677
678 /*
679 * Grab free packets (range count + 1) to represent this xfer
680 * page packet. +1 to represent the xfer page packet itself.
681 * We grab it here so that we know exactly how many we can
682 * fulfil
683 */
684 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
685 while (!list_empty(&net_device->recv_pkt_list)) {
686 list_move_tail(net_device->recv_pkt_list.next, &listHead);
687 if (++count == vmxferpage_packet->range_cnt + 1)
688 break;
689 }
690 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
691
692 /*
693 * We need at least 2 netvsc pkts (1 to represent the xfer
694 * page and at least 1 for the range) i.e. we can handled
695 * some of the xfer page packet ranges...
696 */
697 if (count < 2) {
698 netdev_err(ndev, "Got only %d netvsc pkt...needed "
699 "%d pkts. Dropping this xfer page packet completely!\n",
700 count, vmxferpage_packet->range_cnt + 1);
701
702 /* Return it to the freelist */
703 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
704 for (i = count; i != 0; i--) {
705 list_move_tail(listHead.next,
706 &net_device->recv_pkt_list);
707 }
708 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
709 flags);
710
711 netvsc_send_recv_completion(device,
712 vmxferpage_packet->d.trans_id);
713
714 return;
715 }
716
717 /* Remove the 1st packet to represent the xfer page packet itself */
718 xferpage_packet = (struct xferpage_packet *)listHead.next;
719 list_del(&xferpage_packet->list_ent);
720
721 /* This is how much we can satisfy */
722 xferpage_packet->count = count - 1;
723
724 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
725 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
726 "this xfer page...got %d\n",
727 vmxferpage_packet->range_cnt, xferpage_packet->count);
728 }
729
730 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
731 for (i = 0; i < (count - 1); i++) {
732 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
733 list_del(&netvsc_packet->list_ent);
734
735 /* Initialize the netvsc packet */
736 netvsc_packet->xfer_page_pkt = xferpage_packet;
737 netvsc_packet->completion.recv.recv_completion =
738 netvsc_receive_completion;
739 netvsc_packet->completion.recv.recv_completion_ctx =
740 netvsc_packet;
741 netvsc_packet->device = device;
742 /* Save this so that we can send it back */
743 netvsc_packet->completion.recv.recv_completion_tid =
744 vmxferpage_packet->d.trans_id;
745
746 netvsc_packet->data = (void *)((unsigned long)net_device->
747 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
748 netvsc_packet->total_data_buflen =
749 vmxferpage_packet->ranges[i].byte_count;
750
751 /* Pass it to the upper layer */
752 rndis_filter_receive(device, netvsc_packet);
753
754 netvsc_receive_completion(netvsc_packet->
755 completion.recv.recv_completion_ctx);
756 }
757
758 }
759
netvsc_channel_cb(void * context)760 static void netvsc_channel_cb(void *context)
761 {
762 int ret;
763 struct hv_device *device = context;
764 struct netvsc_device *net_device;
765 u32 bytes_recvd;
766 u64 request_id;
767 unsigned char *packet;
768 struct vmpacket_descriptor *desc;
769 unsigned char *buffer;
770 int bufferlen = NETVSC_PACKET_SIZE;
771 struct net_device *ndev;
772
773 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
774 GFP_ATOMIC);
775 if (!packet)
776 return;
777 buffer = packet;
778
779 net_device = get_inbound_net_device(device);
780 if (!net_device)
781 goto out;
782 ndev = net_device->ndev;
783
784 do {
785 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
786 &bytes_recvd, &request_id);
787 if (ret == 0) {
788 if (bytes_recvd > 0) {
789 desc = (struct vmpacket_descriptor *)buffer;
790 switch (desc->type) {
791 case VM_PKT_COMP:
792 netvsc_send_completion(device, desc);
793 break;
794
795 case VM_PKT_DATA_USING_XFER_PAGES:
796 netvsc_receive(device, desc);
797 break;
798
799 default:
800 netdev_err(ndev,
801 "unhandled packet type %d, "
802 "tid %llx len %d\n",
803 desc->type, request_id,
804 bytes_recvd);
805 break;
806 }
807
808 /* reset */
809 if (bufferlen > NETVSC_PACKET_SIZE) {
810 kfree(buffer);
811 buffer = packet;
812 bufferlen = NETVSC_PACKET_SIZE;
813 }
814 } else {
815 /* reset */
816 if (bufferlen > NETVSC_PACKET_SIZE) {
817 kfree(buffer);
818 buffer = packet;
819 bufferlen = NETVSC_PACKET_SIZE;
820 }
821
822 break;
823 }
824 } else if (ret == -ENOBUFS) {
825 /* Handle large packet */
826 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
827 if (buffer == NULL) {
828 /* Try again next time around */
829 netdev_err(ndev,
830 "unable to allocate buffer of size "
831 "(%d)!!\n", bytes_recvd);
832 break;
833 }
834
835 bufferlen = bytes_recvd;
836 }
837 } while (1);
838
839 out:
840 kfree(buffer);
841 return;
842 }
843
844 /*
845 * netvsc_device_add - Callback when the device belonging to this
846 * driver is added
847 */
netvsc_device_add(struct hv_device * device,void * additional_info)848 int netvsc_device_add(struct hv_device *device, void *additional_info)
849 {
850 int ret = 0;
851 int i;
852 int ring_size =
853 ((struct netvsc_device_info *)additional_info)->ring_size;
854 struct netvsc_device *net_device;
855 struct hv_netvsc_packet *packet, *pos;
856 struct net_device *ndev;
857
858 net_device = alloc_net_device(device);
859 if (!net_device) {
860 ret = -ENOMEM;
861 goto cleanup;
862 }
863
864 /*
865 * Coming into this function, struct net_device * is
866 * registered as the driver private data.
867 * In alloc_net_device(), we register struct netvsc_device *
868 * as the driver private data and stash away struct net_device *
869 * in struct netvsc_device *.
870 */
871 ndev = net_device->ndev;
872
873 /* Initialize the NetVSC channel extension */
874 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
875 spin_lock_init(&net_device->recv_pkt_list_lock);
876
877 INIT_LIST_HEAD(&net_device->recv_pkt_list);
878
879 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
880 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
881 (NETVSC_RECEIVE_SG_COUNT *
882 sizeof(struct hv_page_buffer)), GFP_KERNEL);
883 if (!packet)
884 break;
885
886 list_add_tail(&packet->list_ent,
887 &net_device->recv_pkt_list);
888 }
889 init_completion(&net_device->channel_init_wait);
890
891 /* Open the channel */
892 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
893 ring_size * PAGE_SIZE, NULL, 0,
894 netvsc_channel_cb, device);
895
896 if (ret != 0) {
897 netdev_err(ndev, "unable to open channel: %d\n", ret);
898 goto cleanup;
899 }
900
901 /* Channel is opened */
902 pr_info("hv_netvsc channel opened successfully\n");
903
904 /* Connect with the NetVsp */
905 ret = netvsc_connect_vsp(device);
906 if (ret != 0) {
907 netdev_err(ndev,
908 "unable to connect to NetVSP - %d\n", ret);
909 goto close;
910 }
911
912 return ret;
913
914 close:
915 /* Now, we can close the channel safely */
916 vmbus_close(device->channel);
917
918 cleanup:
919
920 if (net_device) {
921 list_for_each_entry_safe(packet, pos,
922 &net_device->recv_pkt_list,
923 list_ent) {
924 list_del(&packet->list_ent);
925 kfree(packet);
926 }
927
928 kfree(net_device);
929 }
930
931 return ret;
932 }
933