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1/*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, 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
36static struct netvsc_device *alloc_net_device(struct hv_device *device)
37{
38 struct netvsc_device *net_device;
39 struct net_device *ndev = hv_get_drvdata(device);
40
41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
42 if (!net_device)
43 return NULL;
44
45 init_waitqueue_head(&net_device->wait_drain);
46 net_device->start_remove = false;
47 net_device->destroy = false;
48 net_device->dev = device;
49 net_device->ndev = ndev;
50
51 hv_set_drvdata(device, net_device);
52 return net_device;
53}
54
55static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
56{
57 struct netvsc_device *net_device;
58
59 net_device = hv_get_drvdata(device);
60 if (net_device && net_device->destroy)
61 net_device = NULL;
62
63 return net_device;
64}
65
66static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
67{
68 struct netvsc_device *net_device;
69
70 net_device = hv_get_drvdata(device);
71
72 if (!net_device)
73 goto get_in_err;
74
75 if (net_device->destroy &&
76 atomic_read(&net_device->num_outstanding_sends) == 0)
77 net_device = NULL;
78
79get_in_err:
80 return net_device;
81}
82
83
84static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
85{
86 struct nvsp_message *revoke_packet;
87 int ret = 0;
88 struct net_device *ndev = net_device->ndev;
89
90 /*
91 * If we got a section count, it means we received a
92 * SendReceiveBufferComplete msg (ie sent
93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
94 * to send a revoke msg here
95 */
96 if (net_device->recv_section_cnt) {
97 /* Send the revoke receive buffer */
98 revoke_packet = &net_device->revoke_packet;
99 memset(revoke_packet, 0, sizeof(struct nvsp_message));
100
101 revoke_packet->hdr.msg_type =
102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
103 revoke_packet->msg.v1_msg.
104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
105
106 ret = vmbus_sendpacket(net_device->dev->channel,
107 revoke_packet,
108 sizeof(struct nvsp_message),
109 (unsigned long)revoke_packet,
110 VM_PKT_DATA_INBAND, 0);
111 /*
112 * If we failed here, we might as well return and
113 * have a leak rather than continue and a bugchk
114 */
115 if (ret != 0) {
116 netdev_err(ndev, "unable to send "
117 "revoke receive buffer to netvsp\n");
118 return ret;
119 }
120 }
121
122 /* Teardown the gpadl on the vsp end */
123 if (net_device->recv_buf_gpadl_handle) {
124 ret = vmbus_teardown_gpadl(net_device->dev->channel,
125 net_device->recv_buf_gpadl_handle);
126
127 /* If we failed here, we might as well return and have a leak
128 * rather than continue and a bugchk
129 */
130 if (ret != 0) {
131 netdev_err(ndev,
132 "unable to teardown receive buffer's gpadl\n");
133 return ret;
134 }
135 net_device->recv_buf_gpadl_handle = 0;
136 }
137
138 if (net_device->recv_buf) {
139 /* Free up the receive buffer */
140 free_pages((unsigned long)net_device->recv_buf,
141 get_order(net_device->recv_buf_size));
142 net_device->recv_buf = NULL;
143 }
144
145 if (net_device->recv_section) {
146 net_device->recv_section_cnt = 0;
147 kfree(net_device->recv_section);
148 net_device->recv_section = NULL;
149 }
150
151 return ret;
152}
153
154static int netvsc_init_recv_buf(struct hv_device *device)
155{
156 int ret = 0;
157 int t;
158 struct netvsc_device *net_device;
159 struct nvsp_message *init_packet;
160 struct net_device *ndev;
161
162 net_device = get_outbound_net_device(device);
163 if (!net_device)
164 return -ENODEV;
165 ndev = net_device->ndev;
166
167 net_device->recv_buf =
168 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
169 get_order(net_device->recv_buf_size));
170 if (!net_device->recv_buf) {
171 netdev_err(ndev, "unable to allocate receive "
172 "buffer of size %d\n", net_device->recv_buf_size);
173 ret = -ENOMEM;
174 goto cleanup;
175 }
176
177 /*
178 * Establish the gpadl handle for this buffer on this
179 * channel. Note: This call uses the vmbus connection rather
180 * than the channel to establish the gpadl handle.
181 */
182 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
183 net_device->recv_buf_size,
184 &net_device->recv_buf_gpadl_handle);
185 if (ret != 0) {
186 netdev_err(ndev,
187 "unable to establish receive buffer's gpadl\n");
188 goto cleanup;
189 }
190
191
192 /* Notify the NetVsp of the gpadl handle */
193 init_packet = &net_device->channel_init_pkt;
194
195 memset(init_packet, 0, sizeof(struct nvsp_message));
196
197 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
198 init_packet->msg.v1_msg.send_recv_buf.
199 gpadl_handle = net_device->recv_buf_gpadl_handle;
200 init_packet->msg.v1_msg.
201 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
202
203 /* Send the gpadl notification request */
204 ret = vmbus_sendpacket(device->channel, init_packet,
205 sizeof(struct nvsp_message),
206 (unsigned long)init_packet,
207 VM_PKT_DATA_INBAND,
208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
209 if (ret != 0) {
210 netdev_err(ndev,
211 "unable to send receive buffer's gpadl to netvsp\n");
212 goto cleanup;
213 }
214
215 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
216 BUG_ON(t == 0);
217
218
219 /* Check the response */
220 if (init_packet->msg.v1_msg.
221 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
222 netdev_err(ndev, "Unable to complete receive buffer "
223 "initialization with NetVsp - status %d\n",
224 init_packet->msg.v1_msg.
225 send_recv_buf_complete.status);
226 ret = -EINVAL;
227 goto cleanup;
228 }
229
230 /* Parse the response */
231
232 net_device->recv_section_cnt = init_packet->msg.
233 v1_msg.send_recv_buf_complete.num_sections;
234
235 net_device->recv_section = kmemdup(
236 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
237 net_device->recv_section_cnt *
238 sizeof(struct nvsp_1_receive_buffer_section),
239 GFP_KERNEL);
240 if (net_device->recv_section == NULL) {
241 ret = -EINVAL;
242 goto cleanup;
243 }
244
245 /*
246 * For 1st release, there should only be 1 section that represents the
247 * entire receive buffer
248 */
249 if (net_device->recv_section_cnt != 1 ||
250 net_device->recv_section->offset != 0) {
251 ret = -EINVAL;
252 goto cleanup;
253 }
254
255 goto exit;
256
257cleanup:
258 netvsc_destroy_recv_buf(net_device);
259
260exit:
261 return ret;
262}
263
264
265/* Negotiate NVSP protocol version */
266static int negotiate_nvsp_ver(struct hv_device *device,
267 struct netvsc_device *net_device,
268 struct nvsp_message *init_packet,
269 u32 nvsp_ver)
270{
271 int ret, t;
272
273 memset(init_packet, 0, sizeof(struct nvsp_message));
274 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
275 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
276 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
277
278 /* Send the init request */
279 ret = vmbus_sendpacket(device->channel, init_packet,
280 sizeof(struct nvsp_message),
281 (unsigned long)init_packet,
282 VM_PKT_DATA_INBAND,
283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
284
285 if (ret != 0)
286 return ret;
287
288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
289
290 if (t == 0)
291 return -ETIMEDOUT;
292
293 if (init_packet->msg.init_msg.init_complete.status !=
294 NVSP_STAT_SUCCESS)
295 return -EINVAL;
296
297 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
298 return 0;
299
300 /* NVSPv2 only: Send NDIS config */
301 memset(init_packet, 0, sizeof(struct nvsp_message));
302 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
303 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
304 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
305
306 ret = vmbus_sendpacket(device->channel, init_packet,
307 sizeof(struct nvsp_message),
308 (unsigned long)init_packet,
309 VM_PKT_DATA_INBAND, 0);
310
311 return ret;
312}
313
314static int netvsc_connect_vsp(struct hv_device *device)
315{
316 int ret;
317 struct netvsc_device *net_device;
318 struct nvsp_message *init_packet;
319 int ndis_version;
320 struct net_device *ndev;
321
322 net_device = get_outbound_net_device(device);
323 if (!net_device)
324 return -ENODEV;
325 ndev = net_device->ndev;
326
327 init_packet = &net_device->channel_init_pkt;
328
329 /* Negotiate the latest NVSP protocol supported */
330 if (negotiate_nvsp_ver(device, net_device, init_packet,
331 NVSP_PROTOCOL_VERSION_2) == 0) {
332 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
333 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
334 NVSP_PROTOCOL_VERSION_1) == 0) {
335 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
336 } else {
337 ret = -EPROTO;
338 goto cleanup;
339 }
340
341 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
342
343 /* Send the ndis version */
344 memset(init_packet, 0, sizeof(struct nvsp_message));
345
346 ndis_version = 0x00050001;
347
348 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
349 init_packet->msg.v1_msg.
350 send_ndis_ver.ndis_major_ver =
351 (ndis_version & 0xFFFF0000) >> 16;
352 init_packet->msg.v1_msg.
353 send_ndis_ver.ndis_minor_ver =
354 ndis_version & 0xFFFF;
355
356 /* Send the init request */
357 ret = vmbus_sendpacket(device->channel, init_packet,
358 sizeof(struct nvsp_message),
359 (unsigned long)init_packet,
360 VM_PKT_DATA_INBAND, 0);
361 if (ret != 0)
362 goto cleanup;
363
364 /* Post the big receive buffer to NetVSP */
365 ret = netvsc_init_recv_buf(device);
366
367cleanup:
368 return ret;
369}
370
371static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
372{
373 netvsc_destroy_recv_buf(net_device);
374}
375
376/*
377 * netvsc_device_remove - Callback when the root bus device is removed
378 */
379int netvsc_device_remove(struct hv_device *device)
380{
381 struct netvsc_device *net_device;
382 struct hv_netvsc_packet *netvsc_packet, *pos;
383 unsigned long flags;
384
385 net_device = hv_get_drvdata(device);
386 spin_lock_irqsave(&device->channel->inbound_lock, flags);
387 net_device->destroy = true;
388 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
389
390 /* Wait for all send completions */
391 wait_event(net_device->wait_drain,
392 atomic_read(&net_device->num_outstanding_sends) == 0);
393
394 netvsc_disconnect_vsp(net_device);
395
396 /*
397 * Since we have already drained, we don't need to busy wait
398 * as was done in final_release_stor_device()
399 * Note that we cannot set the ext pointer to NULL until
400 * we have drained - to drain the outgoing packets, we need to
401 * allow incoming packets.
402 */
403
404 spin_lock_irqsave(&device->channel->inbound_lock, flags);
405 hv_set_drvdata(device, NULL);
406 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
407
408 /*
409 * At this point, no one should be accessing net_device
410 * except in here
411 */
412 dev_notice(&device->device, "net device safe to remove\n");
413
414 /* Now, we can close the channel safely */
415 vmbus_close(device->channel);
416
417 /* Release all resources */
418 list_for_each_entry_safe(netvsc_packet, pos,
419 &net_device->recv_pkt_list, list_ent) {
420 list_del(&netvsc_packet->list_ent);
421 kfree(netvsc_packet);
422 }
423
424 kfree(net_device);
425 return 0;
426}
427
428
429#define RING_AVAIL_PERCENT_HIWATER 20
430#define RING_AVAIL_PERCENT_LOWATER 10
431
432/*
433 * Get the percentage of available bytes to write in the ring.
434 * The return value is in range from 0 to 100.
435 */
436static inline u32 hv_ringbuf_avail_percent(
437 struct hv_ring_buffer_info *ring_info)
438{
439 u32 avail_read, avail_write;
440
441 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
442
443 return avail_write * 100 / ring_info->ring_datasize;
444}
445
446static void netvsc_send_completion(struct hv_device *device,
447 struct vmpacket_descriptor *packet)
448{
449 struct netvsc_device *net_device;
450 struct nvsp_message *nvsp_packet;
451 struct hv_netvsc_packet *nvsc_packet;
452 struct net_device *ndev;
453
454 net_device = get_inbound_net_device(device);
455 if (!net_device)
456 return;
457 ndev = net_device->ndev;
458
459 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
460 (packet->offset8 << 3));
461
462 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
463 (nvsp_packet->hdr.msg_type ==
464 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
465 (nvsp_packet->hdr.msg_type ==
466 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
467 /* Copy the response back */
468 memcpy(&net_device->channel_init_pkt, nvsp_packet,
469 sizeof(struct nvsp_message));
470 complete(&net_device->channel_init_wait);
471 } else if (nvsp_packet->hdr.msg_type ==
472 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
473 int num_outstanding_sends;
474
475 /* Get the send context */
476 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
477 packet->trans_id;
478
479 /* Notify the layer above us */
480 nvsc_packet->completion.send.send_completion(
481 nvsc_packet->completion.send.send_completion_ctx);
482
483 num_outstanding_sends =
484 atomic_dec_return(&net_device->num_outstanding_sends);
485
486 if (net_device->destroy && num_outstanding_sends == 0)
487 wake_up(&net_device->wait_drain);
488
489 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
490 (hv_ringbuf_avail_percent(&device->channel->outbound)
491 > RING_AVAIL_PERCENT_HIWATER ||
492 num_outstanding_sends < 1))
493 netif_wake_queue(ndev);
494 } else {
495 netdev_err(ndev, "Unknown send completion packet type- "
496 "%d received!!\n", nvsp_packet->hdr.msg_type);
497 }
498
499}
500
501int netvsc_send(struct hv_device *device,
502 struct hv_netvsc_packet *packet)
503{
504 struct netvsc_device *net_device;
505 int ret = 0;
506 struct nvsp_message sendMessage;
507 struct net_device *ndev;
508
509 net_device = get_outbound_net_device(device);
510 if (!net_device)
511 return -ENODEV;
512 ndev = net_device->ndev;
513
514 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
515 if (packet->is_data_pkt) {
516 /* 0 is RMC_DATA; */
517 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
518 } else {
519 /* 1 is RMC_CONTROL; */
520 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
521 }
522
523 /* Not using send buffer section */
524 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
525 0xFFFFFFFF;
526 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
527
528 if (packet->page_buf_cnt) {
529 ret = vmbus_sendpacket_pagebuffer(device->channel,
530 packet->page_buf,
531 packet->page_buf_cnt,
532 &sendMessage,
533 sizeof(struct nvsp_message),
534 (unsigned long)packet);
535 } else {
536 ret = vmbus_sendpacket(device->channel, &sendMessage,
537 sizeof(struct nvsp_message),
538 (unsigned long)packet,
539 VM_PKT_DATA_INBAND,
540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
541
542 }
543
544 if (ret == 0) {
545 atomic_inc(&net_device->num_outstanding_sends);
546 if (hv_ringbuf_avail_percent(&device->channel->outbound) <
547 RING_AVAIL_PERCENT_LOWATER) {
548 netif_stop_queue(ndev);
549 if (atomic_read(&net_device->
550 num_outstanding_sends) < 1)
551 netif_wake_queue(ndev);
552 }
553 } else if (ret == -EAGAIN) {
554 netif_stop_queue(ndev);
555 if (atomic_read(&net_device->num_outstanding_sends) < 1) {
556 netif_wake_queue(ndev);
557 ret = -ENOSPC;
558 }
559 } else {
560 netdev_err(ndev, "Unable to send packet %p ret %d\n",
561 packet, ret);
562 }
563
564 return ret;
565}
566
567static void netvsc_send_recv_completion(struct hv_device *device,
568 u64 transaction_id)
569{
570 struct nvsp_message recvcompMessage;
571 int retries = 0;
572 int ret;
573 struct net_device *ndev;
574 struct netvsc_device *net_device = hv_get_drvdata(device);
575
576 ndev = net_device->ndev;
577
578 recvcompMessage.hdr.msg_type =
579 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
580
581 /* FIXME: Pass in the status */
582 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
583 NVSP_STAT_SUCCESS;
584
585retry_send_cmplt:
586 /* Send the completion */
587 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
588 sizeof(struct nvsp_message), transaction_id,
589 VM_PKT_COMP, 0);
590 if (ret == 0) {
591 /* success */
592 /* no-op */
593 } else if (ret == -EAGAIN) {
594 /* no more room...wait a bit and attempt to retry 3 times */
595 retries++;
596 netdev_err(ndev, "unable to send receive completion pkt"
597 " (tid %llx)...retrying %d\n", transaction_id, retries);
598
599 if (retries < 4) {
600 udelay(100);
601 goto retry_send_cmplt;
602 } else {
603 netdev_err(ndev, "unable to send receive "
604 "completion pkt (tid %llx)...give up retrying\n",
605 transaction_id);
606 }
607 } else {
608 netdev_err(ndev, "unable to send receive "
609 "completion pkt - %llx\n", transaction_id);
610 }
611}
612
613/* Send a receive completion packet to RNDIS device (ie NetVsp) */
614static void netvsc_receive_completion(void *context)
615{
616 struct hv_netvsc_packet *packet = context;
617 struct hv_device *device = (struct hv_device *)packet->device;
618 struct netvsc_device *net_device;
619 u64 transaction_id = 0;
620 bool fsend_receive_comp = false;
621 unsigned long flags;
622 struct net_device *ndev;
623
624 /*
625 * Even though it seems logical to do a GetOutboundNetDevice() here to
626 * send out receive completion, we are using GetInboundNetDevice()
627 * since we may have disable outbound traffic already.
628 */
629 net_device = get_inbound_net_device(device);
630 if (!net_device)
631 return;
632 ndev = net_device->ndev;
633
634 /* Overloading use of the lock. */
635 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
636
637 packet->xfer_page_pkt->count--;
638
639 /*
640 * Last one in the line that represent 1 xfer page packet.
641 * Return the xfer page packet itself to the freelist
642 */
643 if (packet->xfer_page_pkt->count == 0) {
644 fsend_receive_comp = true;
645 transaction_id = packet->completion.recv.recv_completion_tid;
646 list_add_tail(&packet->xfer_page_pkt->list_ent,
647 &net_device->recv_pkt_list);
648
649 }
650
651 /* Put the packet back */
652 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
653 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
654
655 /* Send a receive completion for the xfer page packet */
656 if (fsend_receive_comp)
657 netvsc_send_recv_completion(device, transaction_id);
658
659}
660
661static void netvsc_receive(struct hv_device *device,
662 struct vmpacket_descriptor *packet)
663{
664 struct netvsc_device *net_device;
665 struct vmtransfer_page_packet_header *vmxferpage_packet;
666 struct nvsp_message *nvsp_packet;
667 struct hv_netvsc_packet *netvsc_packet = NULL;
668 /* struct netvsc_driver *netvscDriver; */
669 struct xferpage_packet *xferpage_packet = NULL;
670 int i;
671 int count = 0;
672 unsigned long flags;
673 struct net_device *ndev;
674
675 LIST_HEAD(listHead);
676
677 net_device = get_inbound_net_device(device);
678 if (!net_device)
679 return;
680 ndev = net_device->ndev;
681
682 /*
683 * All inbound packets other than send completion should be xfer page
684 * packet
685 */
686 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
687 netdev_err(ndev, "Unknown packet type received - %d\n",
688 packet->type);
689 return;
690 }
691
692 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
693 (packet->offset8 << 3));
694
695 /* Make sure this is a valid nvsp packet */
696 if (nvsp_packet->hdr.msg_type !=
697 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
698 netdev_err(ndev, "Unknown nvsp packet type received-"
699 " %d\n", nvsp_packet->hdr.msg_type);
700 return;
701 }
702
703 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
704
705 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
706 netdev_err(ndev, "Invalid xfer page set id - "
707 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
708 vmxferpage_packet->xfer_pageset_id);
709 return;
710 }
711
712 /*
713 * Grab free packets (range count + 1) to represent this xfer
714 * page packet. +1 to represent the xfer page packet itself.
715 * We grab it here so that we know exactly how many we can
716 * fulfil
717 */
718 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
719 while (!list_empty(&net_device->recv_pkt_list)) {
720 list_move_tail(net_device->recv_pkt_list.next, &listHead);
721 if (++count == vmxferpage_packet->range_cnt + 1)
722 break;
723 }
724 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
725
726 /*
727 * We need at least 2 netvsc pkts (1 to represent the xfer
728 * page and at least 1 for the range) i.e. we can handled
729 * some of the xfer page packet ranges...
730 */
731 if (count < 2) {
732 netdev_err(ndev, "Got only %d netvsc pkt...needed "
733 "%d pkts. Dropping this xfer page packet completely!\n",
734 count, vmxferpage_packet->range_cnt + 1);
735
736 /* Return it to the freelist */
737 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
738 for (i = count; i != 0; i--) {
739 list_move_tail(listHead.next,
740 &net_device->recv_pkt_list);
741 }
742 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
743 flags);
744
745 netvsc_send_recv_completion(device,
746 vmxferpage_packet->d.trans_id);
747
748 return;
749 }
750
751 /* Remove the 1st packet to represent the xfer page packet itself */
752 xferpage_packet = (struct xferpage_packet *)listHead.next;
753 list_del(&xferpage_packet->list_ent);
754
755 /* This is how much we can satisfy */
756 xferpage_packet->count = count - 1;
757
758 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
759 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
760 "this xfer page...got %d\n",
761 vmxferpage_packet->range_cnt, xferpage_packet->count);
762 }
763
764 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
765 for (i = 0; i < (count - 1); i++) {
766 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
767 list_del(&netvsc_packet->list_ent);
768
769 /* Initialize the netvsc packet */
770 netvsc_packet->xfer_page_pkt = xferpage_packet;
771 netvsc_packet->completion.recv.recv_completion =
772 netvsc_receive_completion;
773 netvsc_packet->completion.recv.recv_completion_ctx =
774 netvsc_packet;
775 netvsc_packet->device = device;
776 /* Save this so that we can send it back */
777 netvsc_packet->completion.recv.recv_completion_tid =
778 vmxferpage_packet->d.trans_id;
779
780 netvsc_packet->data = (void *)((unsigned long)net_device->
781 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
782 netvsc_packet->total_data_buflen =
783 vmxferpage_packet->ranges[i].byte_count;
784
785 /* Pass it to the upper layer */
786 rndis_filter_receive(device, netvsc_packet);
787
788 netvsc_receive_completion(netvsc_packet->
789 completion.recv.recv_completion_ctx);
790 }
791
792}
793
794static void netvsc_channel_cb(void *context)
795{
796 int ret;
797 struct hv_device *device = context;
798 struct netvsc_device *net_device;
799 u32 bytes_recvd;
800 u64 request_id;
801 unsigned char *packet;
802 struct vmpacket_descriptor *desc;
803 unsigned char *buffer;
804 int bufferlen = NETVSC_PACKET_SIZE;
805 struct net_device *ndev;
806
807 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
808 GFP_ATOMIC);
809 if (!packet)
810 return;
811 buffer = packet;
812
813 net_device = get_inbound_net_device(device);
814 if (!net_device)
815 goto out;
816 ndev = net_device->ndev;
817
818 do {
819 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
820 &bytes_recvd, &request_id);
821 if (ret == 0) {
822 if (bytes_recvd > 0) {
823 desc = (struct vmpacket_descriptor *)buffer;
824 switch (desc->type) {
825 case VM_PKT_COMP:
826 netvsc_send_completion(device, desc);
827 break;
828
829 case VM_PKT_DATA_USING_XFER_PAGES:
830 netvsc_receive(device, desc);
831 break;
832
833 default:
834 netdev_err(ndev,
835 "unhandled packet type %d, "
836 "tid %llx len %d\n",
837 desc->type, request_id,
838 bytes_recvd);
839 break;
840 }
841
842 /* reset */
843 if (bufferlen > NETVSC_PACKET_SIZE) {
844 kfree(buffer);
845 buffer = packet;
846 bufferlen = NETVSC_PACKET_SIZE;
847 }
848 } else {
849 /* reset */
850 if (bufferlen > NETVSC_PACKET_SIZE) {
851 kfree(buffer);
852 buffer = packet;
853 bufferlen = NETVSC_PACKET_SIZE;
854 }
855
856 break;
857 }
858 } else if (ret == -ENOBUFS) {
859 /* Handle large packet */
860 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
861 if (buffer == NULL) {
862 /* Try again next time around */
863 netdev_err(ndev,
864 "unable to allocate buffer of size "
865 "(%d)!!\n", bytes_recvd);
866 break;
867 }
868
869 bufferlen = bytes_recvd;
870 }
871 } while (1);
872
873out:
874 kfree(buffer);
875 return;
876}
877
878/*
879 * netvsc_device_add - Callback when the device belonging to this
880 * driver is added
881 */
882int netvsc_device_add(struct hv_device *device, void *additional_info)
883{
884 int ret = 0;
885 int i;
886 int ring_size =
887 ((struct netvsc_device_info *)additional_info)->ring_size;
888 struct netvsc_device *net_device;
889 struct hv_netvsc_packet *packet, *pos;
890 struct net_device *ndev;
891
892 net_device = alloc_net_device(device);
893 if (!net_device) {
894 ret = -ENOMEM;
895 goto cleanup;
896 }
897
898 /*
899 * Coming into this function, struct net_device * is
900 * registered as the driver private data.
901 * In alloc_net_device(), we register struct netvsc_device *
902 * as the driver private data and stash away struct net_device *
903 * in struct netvsc_device *.
904 */
905 ndev = net_device->ndev;
906
907 /* Initialize the NetVSC channel extension */
908 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
909 spin_lock_init(&net_device->recv_pkt_list_lock);
910
911 INIT_LIST_HEAD(&net_device->recv_pkt_list);
912
913 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
914 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
915 (NETVSC_RECEIVE_SG_COUNT *
916 sizeof(struct hv_page_buffer)), GFP_KERNEL);
917 if (!packet)
918 break;
919
920 list_add_tail(&packet->list_ent,
921 &net_device->recv_pkt_list);
922 }
923 init_completion(&net_device->channel_init_wait);
924
925 /* Open the channel */
926 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
927 ring_size * PAGE_SIZE, NULL, 0,
928 netvsc_channel_cb, device);
929
930 if (ret != 0) {
931 netdev_err(ndev, "unable to open channel: %d\n", ret);
932 goto cleanup;
933 }
934
935 /* Channel is opened */
936 pr_info("hv_netvsc channel opened successfully\n");
937
938 /* Connect with the NetVsp */
939 ret = netvsc_connect_vsp(device);
940 if (ret != 0) {
941 netdev_err(ndev,
942 "unable to connect to NetVSP - %d\n", ret);
943 goto close;
944 }
945
946 return ret;
947
948close:
949 /* Now, we can close the channel safely */
950 vmbus_close(device->channel);
951
952cleanup:
953
954 if (net_device) {
955 list_for_each_entry_safe(packet, pos,
956 &net_device->recv_pkt_list,
957 list_ent) {
958 list_del(&packet->list_ent);
959 kfree(packet);
960 }
961
962 kfree(net_device);
963 }
964
965 return ret;
966}