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 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
304
305 ret = vmbus_sendpacket(device->channel, init_packet,
306 sizeof(struct nvsp_message),
307 (unsigned long)init_packet,
308 VM_PKT_DATA_INBAND, 0);
309
310 return ret;
311 }
312
netvsc_connect_vsp(struct hv_device * device)313 static int netvsc_connect_vsp(struct hv_device *device)
314 {
315 int ret;
316 struct netvsc_device *net_device;
317 struct nvsp_message *init_packet;
318 int ndis_version;
319 struct net_device *ndev;
320
321 net_device = get_outbound_net_device(device);
322 if (!net_device)
323 return -ENODEV;
324 ndev = net_device->ndev;
325
326 init_packet = &net_device->channel_init_pkt;
327
328 /* Negotiate the latest NVSP protocol supported */
329 if (negotiate_nvsp_ver(device, net_device, init_packet,
330 NVSP_PROTOCOL_VERSION_2) == 0) {
331 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
332 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
333 NVSP_PROTOCOL_VERSION_1) == 0) {
334 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
335 } else {
336 ret = -EPROTO;
337 goto cleanup;
338 }
339
340 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
341
342 /* Send the ndis version */
343 memset(init_packet, 0, sizeof(struct nvsp_message));
344
345 ndis_version = 0x00050001;
346
347 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
348 init_packet->msg.v1_msg.
349 send_ndis_ver.ndis_major_ver =
350 (ndis_version & 0xFFFF0000) >> 16;
351 init_packet->msg.v1_msg.
352 send_ndis_ver.ndis_minor_ver =
353 ndis_version & 0xFFFF;
354
355 /* Send the init request */
356 ret = vmbus_sendpacket(device->channel, init_packet,
357 sizeof(struct nvsp_message),
358 (unsigned long)init_packet,
359 VM_PKT_DATA_INBAND, 0);
360 if (ret != 0)
361 goto cleanup;
362
363 /* Post the big receive buffer to NetVSP */
364 ret = netvsc_init_recv_buf(device);
365
366 cleanup:
367 return ret;
368 }
369
netvsc_disconnect_vsp(struct netvsc_device * net_device)370 static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
371 {
372 netvsc_destroy_recv_buf(net_device);
373 }
374
375 /*
376 * netvsc_device_remove - Callback when the root bus device is removed
377 */
netvsc_device_remove(struct hv_device * device)378 int netvsc_device_remove(struct hv_device *device)
379 {
380 struct netvsc_device *net_device;
381 struct hv_netvsc_packet *netvsc_packet, *pos;
382 unsigned long flags;
383
384 net_device = hv_get_drvdata(device);
385 spin_lock_irqsave(&device->channel->inbound_lock, flags);
386 net_device->destroy = true;
387 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
388
389 /* Wait for all send completions */
390 while (atomic_read(&net_device->num_outstanding_sends)) {
391 dev_info(&device->device,
392 "waiting for %d requests to complete...\n",
393 atomic_read(&net_device->num_outstanding_sends));
394 udelay(100);
395 }
396
397 netvsc_disconnect_vsp(net_device);
398
399 /*
400 * Since we have already drained, we don't need to busy wait
401 * as was done in final_release_stor_device()
402 * Note that we cannot set the ext pointer to NULL until
403 * we have drained - to drain the outgoing packets, we need to
404 * allow incoming packets.
405 */
406
407 spin_lock_irqsave(&device->channel->inbound_lock, flags);
408 hv_set_drvdata(device, NULL);
409 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
410
411 /*
412 * At this point, no one should be accessing net_device
413 * except in here
414 */
415 dev_notice(&device->device, "net device safe to remove\n");
416
417 /* Now, we can close the channel safely */
418 vmbus_close(device->channel);
419
420 /* Release all resources */
421 list_for_each_entry_safe(netvsc_packet, pos,
422 &net_device->recv_pkt_list, list_ent) {
423 list_del(&netvsc_packet->list_ent);
424 kfree(netvsc_packet);
425 }
426
427 kfree(net_device);
428 return 0;
429 }
430
netvsc_send_completion(struct hv_device * device,struct vmpacket_descriptor * packet)431 static void netvsc_send_completion(struct hv_device *device,
432 struct vmpacket_descriptor *packet)
433 {
434 struct netvsc_device *net_device;
435 struct nvsp_message *nvsp_packet;
436 struct hv_netvsc_packet *nvsc_packet;
437 struct net_device *ndev;
438
439 net_device = get_inbound_net_device(device);
440 if (!net_device)
441 return;
442 ndev = net_device->ndev;
443
444 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
445 (packet->offset8 << 3));
446
447 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
448 (nvsp_packet->hdr.msg_type ==
449 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
450 (nvsp_packet->hdr.msg_type ==
451 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
452 /* Copy the response back */
453 memcpy(&net_device->channel_init_pkt, nvsp_packet,
454 sizeof(struct nvsp_message));
455 complete(&net_device->channel_init_wait);
456 } else if (nvsp_packet->hdr.msg_type ==
457 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
458 /* Get the send context */
459 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
460 packet->trans_id;
461
462 /* Notify the layer above us */
463 nvsc_packet->completion.send.send_completion(
464 nvsc_packet->completion.send.send_completion_ctx);
465
466 atomic_dec(&net_device->num_outstanding_sends);
467
468 if (netif_queue_stopped(ndev) && !net_device->start_remove)
469 netif_wake_queue(ndev);
470 } else {
471 netdev_err(ndev, "Unknown send completion packet type- "
472 "%d received!!\n", nvsp_packet->hdr.msg_type);
473 }
474
475 }
476
netvsc_send(struct hv_device * device,struct hv_netvsc_packet * packet)477 int netvsc_send(struct hv_device *device,
478 struct hv_netvsc_packet *packet)
479 {
480 struct netvsc_device *net_device;
481 int ret = 0;
482 struct nvsp_message sendMessage;
483 struct net_device *ndev;
484
485 net_device = get_outbound_net_device(device);
486 if (!net_device)
487 return -ENODEV;
488 ndev = net_device->ndev;
489
490 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
491 if (packet->is_data_pkt) {
492 /* 0 is RMC_DATA; */
493 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
494 } else {
495 /* 1 is RMC_CONTROL; */
496 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
497 }
498
499 /* Not using send buffer section */
500 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
501 0xFFFFFFFF;
502 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
503
504 if (packet->page_buf_cnt) {
505 ret = vmbus_sendpacket_pagebuffer(device->channel,
506 packet->page_buf,
507 packet->page_buf_cnt,
508 &sendMessage,
509 sizeof(struct nvsp_message),
510 (unsigned long)packet);
511 } else {
512 ret = vmbus_sendpacket(device->channel, &sendMessage,
513 sizeof(struct nvsp_message),
514 (unsigned long)packet,
515 VM_PKT_DATA_INBAND,
516 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
517
518 }
519
520 if (ret == 0) {
521 atomic_inc(&net_device->num_outstanding_sends);
522 } else if (ret == -EAGAIN) {
523 netif_stop_queue(ndev);
524 if (atomic_read(&net_device->num_outstanding_sends) < 1)
525 netif_wake_queue(ndev);
526 } else {
527 netdev_err(ndev, "Unable to send packet %p ret %d\n",
528 packet, ret);
529 }
530
531 return ret;
532 }
533
netvsc_send_recv_completion(struct hv_device * device,u64 transaction_id)534 static void netvsc_send_recv_completion(struct hv_device *device,
535 u64 transaction_id)
536 {
537 struct nvsp_message recvcompMessage;
538 int retries = 0;
539 int ret;
540 struct net_device *ndev;
541 struct netvsc_device *net_device = hv_get_drvdata(device);
542
543 ndev = net_device->ndev;
544
545 recvcompMessage.hdr.msg_type =
546 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
547
548 /* FIXME: Pass in the status */
549 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
550 NVSP_STAT_SUCCESS;
551
552 retry_send_cmplt:
553 /* Send the completion */
554 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
555 sizeof(struct nvsp_message), transaction_id,
556 VM_PKT_COMP, 0);
557 if (ret == 0) {
558 /* success */
559 /* no-op */
560 } else if (ret == -EAGAIN) {
561 /* no more room...wait a bit and attempt to retry 3 times */
562 retries++;
563 netdev_err(ndev, "unable to send receive completion pkt"
564 " (tid %llx)...retrying %d\n", transaction_id, retries);
565
566 if (retries < 4) {
567 udelay(100);
568 goto retry_send_cmplt;
569 } else {
570 netdev_err(ndev, "unable to send receive "
571 "completion pkt (tid %llx)...give up retrying\n",
572 transaction_id);
573 }
574 } else {
575 netdev_err(ndev, "unable to send receive "
576 "completion pkt - %llx\n", transaction_id);
577 }
578 }
579
580 /* Send a receive completion packet to RNDIS device (ie NetVsp) */
netvsc_receive_completion(void * context)581 static void netvsc_receive_completion(void *context)
582 {
583 struct hv_netvsc_packet *packet = context;
584 struct hv_device *device = (struct hv_device *)packet->device;
585 struct netvsc_device *net_device;
586 u64 transaction_id = 0;
587 bool fsend_receive_comp = false;
588 unsigned long flags;
589 struct net_device *ndev;
590
591 /*
592 * Even though it seems logical to do a GetOutboundNetDevice() here to
593 * send out receive completion, we are using GetInboundNetDevice()
594 * since we may have disable outbound traffic already.
595 */
596 net_device = get_inbound_net_device(device);
597 if (!net_device)
598 return;
599 ndev = net_device->ndev;
600
601 /* Overloading use of the lock. */
602 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
603
604 packet->xfer_page_pkt->count--;
605
606 /*
607 * Last one in the line that represent 1 xfer page packet.
608 * Return the xfer page packet itself to the freelist
609 */
610 if (packet->xfer_page_pkt->count == 0) {
611 fsend_receive_comp = true;
612 transaction_id = packet->completion.recv.recv_completion_tid;
613 list_add_tail(&packet->xfer_page_pkt->list_ent,
614 &net_device->recv_pkt_list);
615
616 }
617
618 /* Put the packet back */
619 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
620 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
621
622 /* Send a receive completion for the xfer page packet */
623 if (fsend_receive_comp)
624 netvsc_send_recv_completion(device, transaction_id);
625
626 }
627
netvsc_receive(struct hv_device * device,struct vmpacket_descriptor * packet)628 static void netvsc_receive(struct hv_device *device,
629 struct vmpacket_descriptor *packet)
630 {
631 struct netvsc_device *net_device;
632 struct vmtransfer_page_packet_header *vmxferpage_packet;
633 struct nvsp_message *nvsp_packet;
634 struct hv_netvsc_packet *netvsc_packet = NULL;
635 /* struct netvsc_driver *netvscDriver; */
636 struct xferpage_packet *xferpage_packet = NULL;
637 int i;
638 int count = 0;
639 unsigned long flags;
640 struct net_device *ndev;
641
642 LIST_HEAD(listHead);
643
644 net_device = get_inbound_net_device(device);
645 if (!net_device)
646 return;
647 ndev = net_device->ndev;
648
649 /*
650 * All inbound packets other than send completion should be xfer page
651 * packet
652 */
653 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
654 netdev_err(ndev, "Unknown packet type received - %d\n",
655 packet->type);
656 return;
657 }
658
659 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
660 (packet->offset8 << 3));
661
662 /* Make sure this is a valid nvsp packet */
663 if (nvsp_packet->hdr.msg_type !=
664 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
665 netdev_err(ndev, "Unknown nvsp packet type received-"
666 " %d\n", nvsp_packet->hdr.msg_type);
667 return;
668 }
669
670 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
671
672 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
673 netdev_err(ndev, "Invalid xfer page set id - "
674 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
675 vmxferpage_packet->xfer_pageset_id);
676 return;
677 }
678
679 /*
680 * Grab free packets (range count + 1) to represent this xfer
681 * page packet. +1 to represent the xfer page packet itself.
682 * We grab it here so that we know exactly how many we can
683 * fulfil
684 */
685 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
686 while (!list_empty(&net_device->recv_pkt_list)) {
687 list_move_tail(net_device->recv_pkt_list.next, &listHead);
688 if (++count == vmxferpage_packet->range_cnt + 1)
689 break;
690 }
691 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
692
693 /*
694 * We need at least 2 netvsc pkts (1 to represent the xfer
695 * page and at least 1 for the range) i.e. we can handled
696 * some of the xfer page packet ranges...
697 */
698 if (count < 2) {
699 netdev_err(ndev, "Got only %d netvsc pkt...needed "
700 "%d pkts. Dropping this xfer page packet completely!\n",
701 count, vmxferpage_packet->range_cnt + 1);
702
703 /* Return it to the freelist */
704 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
705 for (i = count; i != 0; i--) {
706 list_move_tail(listHead.next,
707 &net_device->recv_pkt_list);
708 }
709 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
710 flags);
711
712 netvsc_send_recv_completion(device,
713 vmxferpage_packet->d.trans_id);
714
715 return;
716 }
717
718 /* Remove the 1st packet to represent the xfer page packet itself */
719 xferpage_packet = (struct xferpage_packet *)listHead.next;
720 list_del(&xferpage_packet->list_ent);
721
722 /* This is how much we can satisfy */
723 xferpage_packet->count = count - 1;
724
725 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
726 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
727 "this xfer page...got %d\n",
728 vmxferpage_packet->range_cnt, xferpage_packet->count);
729 }
730
731 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
732 for (i = 0; i < (count - 1); i++) {
733 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
734 list_del(&netvsc_packet->list_ent);
735
736 /* Initialize the netvsc packet */
737 netvsc_packet->xfer_page_pkt = xferpage_packet;
738 netvsc_packet->completion.recv.recv_completion =
739 netvsc_receive_completion;
740 netvsc_packet->completion.recv.recv_completion_ctx =
741 netvsc_packet;
742 netvsc_packet->device = device;
743 /* Save this so that we can send it back */
744 netvsc_packet->completion.recv.recv_completion_tid =
745 vmxferpage_packet->d.trans_id;
746
747 netvsc_packet->data = (void *)((unsigned long)net_device->
748 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
749 netvsc_packet->total_data_buflen =
750 vmxferpage_packet->ranges[i].byte_count;
751
752 /* Pass it to the upper layer */
753 rndis_filter_receive(device, netvsc_packet);
754
755 netvsc_receive_completion(netvsc_packet->
756 completion.recv.recv_completion_ctx);
757 }
758
759 }
760
netvsc_channel_cb(void * context)761 static void netvsc_channel_cb(void *context)
762 {
763 int ret;
764 struct hv_device *device = context;
765 struct netvsc_device *net_device;
766 u32 bytes_recvd;
767 u64 request_id;
768 unsigned char *packet;
769 struct vmpacket_descriptor *desc;
770 unsigned char *buffer;
771 int bufferlen = NETVSC_PACKET_SIZE;
772 struct net_device *ndev;
773
774 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
775 GFP_ATOMIC);
776 if (!packet)
777 return;
778 buffer = packet;
779
780 net_device = get_inbound_net_device(device);
781 if (!net_device)
782 goto out;
783 ndev = net_device->ndev;
784
785 do {
786 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
787 &bytes_recvd, &request_id);
788 if (ret == 0) {
789 if (bytes_recvd > 0) {
790 desc = (struct vmpacket_descriptor *)buffer;
791 switch (desc->type) {
792 case VM_PKT_COMP:
793 netvsc_send_completion(device, desc);
794 break;
795
796 case VM_PKT_DATA_USING_XFER_PAGES:
797 netvsc_receive(device, desc);
798 break;
799
800 default:
801 netdev_err(ndev,
802 "unhandled packet type %d, "
803 "tid %llx len %d\n",
804 desc->type, request_id,
805 bytes_recvd);
806 break;
807 }
808
809 /* reset */
810 if (bufferlen > NETVSC_PACKET_SIZE) {
811 kfree(buffer);
812 buffer = packet;
813 bufferlen = NETVSC_PACKET_SIZE;
814 }
815 } else {
816 /* reset */
817 if (bufferlen > NETVSC_PACKET_SIZE) {
818 kfree(buffer);
819 buffer = packet;
820 bufferlen = NETVSC_PACKET_SIZE;
821 }
822
823 break;
824 }
825 } else if (ret == -ENOBUFS) {
826 /* Handle large packet */
827 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
828 if (buffer == NULL) {
829 /* Try again next time around */
830 netdev_err(ndev,
831 "unable to allocate buffer of size "
832 "(%d)!!\n", bytes_recvd);
833 break;
834 }
835
836 bufferlen = bytes_recvd;
837 }
838 } while (1);
839
840 out:
841 kfree(buffer);
842 return;
843 }
844
845 /*
846 * netvsc_device_add - Callback when the device belonging to this
847 * driver is added
848 */
netvsc_device_add(struct hv_device * device,void * additional_info)849 int netvsc_device_add(struct hv_device *device, void *additional_info)
850 {
851 int ret = 0;
852 int i;
853 int ring_size =
854 ((struct netvsc_device_info *)additional_info)->ring_size;
855 struct netvsc_device *net_device;
856 struct hv_netvsc_packet *packet, *pos;
857 struct net_device *ndev;
858
859 net_device = alloc_net_device(device);
860 if (!net_device) {
861 ret = -ENOMEM;
862 goto cleanup;
863 }
864
865 /*
866 * Coming into this function, struct net_device * is
867 * registered as the driver private data.
868 * In alloc_net_device(), we register struct netvsc_device *
869 * as the driver private data and stash away struct net_device *
870 * in struct netvsc_device *.
871 */
872 ndev = net_device->ndev;
873
874 /* Initialize the NetVSC channel extension */
875 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
876 spin_lock_init(&net_device->recv_pkt_list_lock);
877
878 INIT_LIST_HEAD(&net_device->recv_pkt_list);
879
880 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
881 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
882 (NETVSC_RECEIVE_SG_COUNT *
883 sizeof(struct hv_page_buffer)), GFP_KERNEL);
884 if (!packet)
885 break;
886
887 list_add_tail(&packet->list_ent,
888 &net_device->recv_pkt_list);
889 }
890 init_completion(&net_device->channel_init_wait);
891
892 /* Open the channel */
893 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
894 ring_size * PAGE_SIZE, NULL, 0,
895 netvsc_channel_cb, device);
896
897 if (ret != 0) {
898 netdev_err(ndev, "unable to open channel: %d\n", ret);
899 goto cleanup;
900 }
901
902 /* Channel is opened */
903 pr_info("hv_netvsc channel opened successfully\n");
904
905 /* Connect with the NetVsp */
906 ret = netvsc_connect_vsp(device);
907 if (ret != 0) {
908 netdev_err(ndev,
909 "unable to connect to NetVSP - %d\n", ret);
910 goto close;
911 }
912
913 return ret;
914
915 close:
916 /* Now, we can close the channel safely */
917 vmbus_close(device->channel);
918
919 cleanup:
920
921 if (net_device) {
922 list_for_each_entry_safe(packet, pos,
923 &net_device->recv_pkt_list,
924 list_ent) {
925 list_del(&packet->list_ent);
926 kfree(packet);
927 }
928
929 kfree(net_device);
930 }
931
932 return ret;
933 }
934