]>
Commit | Line | Data |
---|---|---|
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 | ||
36 | static struct netvsc_device *alloc_net_device(struct hv_device *device) | |
37 | { | |
38 | struct netvsc_device *net_device; | |
39 | struct net_device *ndev = hv_get_drvdata(device); | |
40 | ||
41 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); | |
42 | if (!net_device) | |
43 | return NULL; | |
44 | ||
45 | init_waitqueue_head(&net_device->wait_drain); | |
46 | net_device->start_remove = false; | |
47 | net_device->destroy = false; | |
48 | net_device->dev = device; | |
49 | net_device->ndev = ndev; | |
50 | ||
51 | hv_set_drvdata(device, net_device); | |
52 | return net_device; | |
53 | } | |
54 | ||
55 | static struct netvsc_device *get_outbound_net_device(struct hv_device *device) | |
56 | { | |
57 | struct netvsc_device *net_device; | |
58 | ||
59 | net_device = hv_get_drvdata(device); | |
60 | if (net_device && net_device->destroy) | |
61 | net_device = NULL; | |
62 | ||
63 | return net_device; | |
64 | } | |
65 | ||
66 | static struct netvsc_device *get_inbound_net_device(struct hv_device *device) | |
67 | { | |
68 | struct netvsc_device *net_device; | |
69 | ||
70 | net_device = hv_get_drvdata(device); | |
71 | ||
72 | if (!net_device) | |
73 | goto get_in_err; | |
74 | ||
75 | if (net_device->destroy && | |
76 | atomic_read(&net_device->num_outstanding_sends) == 0) | |
77 | net_device = NULL; | |
78 | ||
79 | get_in_err: | |
80 | return net_device; | |
81 | } | |
82 | ||
83 | ||
84 | static int netvsc_destroy_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 | ||
154 | static 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 | ||
257 | cleanup: | |
258 | netvsc_destroy_recv_buf(net_device); | |
259 | ||
260 | exit: | |
261 | return ret; | |
262 | } | |
263 | ||
264 | ||
265 | /* Negotiate NVSP protocol version */ | |
266 | static 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 | ||
314 | static 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 | ||
367 | cleanup: | |
368 | return ret; | |
369 | } | |
370 | ||
371 | static 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 | */ | |
379 | int 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 | ||
387 | netvsc_disconnect_vsp(net_device); | |
388 | ||
389 | /* | |
390 | * Since we have already drained, we don't need to busy wait | |
391 | * as was done in final_release_stor_device() | |
392 | * Note that we cannot set the ext pointer to NULL until | |
393 | * we have drained - to drain the outgoing packets, we need to | |
394 | * allow incoming packets. | |
395 | */ | |
396 | ||
397 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
398 | hv_set_drvdata(device, NULL); | |
399 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
400 | ||
401 | /* | |
402 | * At this point, no one should be accessing net_device | |
403 | * except in here | |
404 | */ | |
405 | dev_notice(&device->device, "net device safe to remove\n"); | |
406 | ||
407 | /* Now, we can close the channel safely */ | |
408 | vmbus_close(device->channel); | |
409 | ||
410 | /* Release all resources */ | |
411 | list_for_each_entry_safe(netvsc_packet, pos, | |
412 | &net_device->recv_pkt_list, list_ent) { | |
413 | list_del(&netvsc_packet->list_ent); | |
414 | kfree(netvsc_packet); | |
415 | } | |
416 | ||
417 | kfree(net_device); | |
418 | return 0; | |
419 | } | |
420 | ||
421 | ||
422 | #define RING_AVAIL_PERCENT_HIWATER 20 | |
423 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
424 | ||
425 | /* | |
426 | * Get the percentage of available bytes to write in the ring. | |
427 | * The return value is in range from 0 to 100. | |
428 | */ | |
429 | static inline u32 hv_ringbuf_avail_percent( | |
430 | struct hv_ring_buffer_info *ring_info) | |
431 | { | |
432 | u32 avail_read, avail_write; | |
433 | ||
434 | hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); | |
435 | ||
436 | return avail_write * 100 / ring_info->ring_datasize; | |
437 | } | |
438 | ||
439 | static void netvsc_send_completion(struct hv_device *device, | |
440 | struct vmpacket_descriptor *packet) | |
441 | { | |
442 | struct netvsc_device *net_device; | |
443 | struct nvsp_message *nvsp_packet; | |
444 | struct hv_netvsc_packet *nvsc_packet; | |
445 | struct net_device *ndev; | |
446 | ||
447 | net_device = get_inbound_net_device(device); | |
448 | if (!net_device) | |
449 | return; | |
450 | ndev = net_device->ndev; | |
451 | ||
452 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + | |
453 | (packet->offset8 << 3)); | |
454 | ||
455 | if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || | |
456 | (nvsp_packet->hdr.msg_type == | |
457 | NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || | |
458 | (nvsp_packet->hdr.msg_type == | |
459 | NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { | |
460 | /* Copy the response back */ | |
461 | memcpy(&net_device->channel_init_pkt, nvsp_packet, | |
462 | sizeof(struct nvsp_message)); | |
463 | complete(&net_device->channel_init_wait); | |
464 | } else if (nvsp_packet->hdr.msg_type == | |
465 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { | |
466 | int num_outstanding_sends; | |
467 | ||
468 | /* Get the send context */ | |
469 | nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) | |
470 | packet->trans_id; | |
471 | ||
472 | /* Notify the layer above us */ | |
473 | if (nvsc_packet) | |
474 | nvsc_packet->completion.send.send_completion( | |
475 | nvsc_packet->completion.send. | |
476 | send_completion_ctx); | |
477 | ||
478 | num_outstanding_sends = | |
479 | atomic_dec_return(&net_device->num_outstanding_sends); | |
480 | ||
481 | if (net_device->destroy && num_outstanding_sends == 0) | |
482 | wake_up(&net_device->wait_drain); | |
483 | ||
484 | if (netif_queue_stopped(ndev) && !net_device->start_remove && | |
485 | (hv_ringbuf_avail_percent(&device->channel->outbound) | |
486 | > RING_AVAIL_PERCENT_HIWATER || | |
487 | num_outstanding_sends < 1)) | |
488 | netif_wake_queue(ndev); | |
489 | } else { | |
490 | netdev_err(ndev, "Unknown send completion packet type- " | |
491 | "%d received!!\n", nvsp_packet->hdr.msg_type); | |
492 | } | |
493 | ||
494 | } | |
495 | ||
496 | int netvsc_send(struct hv_device *device, | |
497 | struct hv_netvsc_packet *packet) | |
498 | { | |
499 | struct netvsc_device *net_device; | |
500 | int ret = 0; | |
501 | struct nvsp_message sendMessage; | |
502 | struct net_device *ndev; | |
503 | u64 req_id; | |
504 | ||
505 | net_device = get_outbound_net_device(device); | |
506 | if (!net_device) | |
507 | return -ENODEV; | |
508 | ndev = net_device->ndev; | |
509 | ||
510 | sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; | |
511 | if (packet->is_data_pkt) { | |
512 | /* 0 is RMC_DATA; */ | |
513 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; | |
514 | } else { | |
515 | /* 1 is RMC_CONTROL; */ | |
516 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; | |
517 | } | |
518 | ||
519 | /* Not using send buffer section */ | |
520 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = | |
521 | 0xFFFFFFFF; | |
522 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; | |
523 | ||
524 | if (packet->completion.send.send_completion) | |
525 | req_id = (ulong)packet; | |
526 | else | |
527 | req_id = 0; | |
528 | ||
529 | if (packet->page_buf_cnt) { | |
530 | ret = vmbus_sendpacket_pagebuffer(device->channel, | |
531 | packet->page_buf, | |
532 | packet->page_buf_cnt, | |
533 | &sendMessage, | |
534 | sizeof(struct nvsp_message), | |
535 | req_id); | |
536 | } else { | |
537 | ret = vmbus_sendpacket(device->channel, &sendMessage, | |
538 | sizeof(struct nvsp_message), | |
539 | req_id, | |
540 | VM_PKT_DATA_INBAND, | |
541 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
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 | ||
567 | static void netvsc_send_recv_completion(struct hv_device *device, | |
568 | u64 transaction_id, u32 status) | |
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 | recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; | |
582 | ||
583 | retry_send_cmplt: | |
584 | /* Send the completion */ | |
585 | ret = vmbus_sendpacket(device->channel, &recvcompMessage, | |
586 | sizeof(struct nvsp_message), transaction_id, | |
587 | VM_PKT_COMP, 0); | |
588 | if (ret == 0) { | |
589 | /* success */ | |
590 | /* no-op */ | |
591 | } else if (ret == -EAGAIN) { | |
592 | /* no more room...wait a bit and attempt to retry 3 times */ | |
593 | retries++; | |
594 | netdev_err(ndev, "unable to send receive completion pkt" | |
595 | " (tid %llx)...retrying %d\n", transaction_id, retries); | |
596 | ||
597 | if (retries < 4) { | |
598 | udelay(100); | |
599 | goto retry_send_cmplt; | |
600 | } else { | |
601 | netdev_err(ndev, "unable to send receive " | |
602 | "completion pkt (tid %llx)...give up retrying\n", | |
603 | transaction_id); | |
604 | } | |
605 | } else { | |
606 | netdev_err(ndev, "unable to send receive " | |
607 | "completion pkt - %llx\n", transaction_id); | |
608 | } | |
609 | } | |
610 | ||
611 | /* Send a receive completion packet to RNDIS device (ie NetVsp) */ | |
612 | static void netvsc_receive_completion(void *context) | |
613 | { | |
614 | struct hv_netvsc_packet *packet = context; | |
615 | struct hv_device *device = packet->device; | |
616 | struct netvsc_device *net_device; | |
617 | u64 transaction_id = 0; | |
618 | bool fsend_receive_comp = false; | |
619 | unsigned long flags; | |
620 | struct net_device *ndev; | |
621 | u32 status = NVSP_STAT_NONE; | |
622 | ||
623 | /* | |
624 | * Even though it seems logical to do a GetOutboundNetDevice() here to | |
625 | * send out receive completion, we are using GetInboundNetDevice() | |
626 | * since we may have disable outbound traffic already. | |
627 | */ | |
628 | net_device = get_inbound_net_device(device); | |
629 | if (!net_device) | |
630 | return; | |
631 | ndev = net_device->ndev; | |
632 | ||
633 | /* Overloading use of the lock. */ | |
634 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
635 | ||
636 | if (packet->status != NVSP_STAT_SUCCESS) | |
637 | packet->xfer_page_pkt->status = NVSP_STAT_FAIL; | |
638 | ||
639 | packet->xfer_page_pkt->count--; | |
640 | ||
641 | /* | |
642 | * Last one in the line that represent 1 xfer page packet. | |
643 | * Return the xfer page packet itself to the freelist | |
644 | */ | |
645 | if (packet->xfer_page_pkt->count == 0) { | |
646 | fsend_receive_comp = true; | |
647 | transaction_id = packet->completion.recv.recv_completion_tid; | |
648 | status = packet->xfer_page_pkt->status; | |
649 | list_add_tail(&packet->xfer_page_pkt->list_ent, | |
650 | &net_device->recv_pkt_list); | |
651 | ||
652 | } | |
653 | ||
654 | /* Put the packet back */ | |
655 | list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); | |
656 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); | |
657 | ||
658 | /* Send a receive completion for the xfer page packet */ | |
659 | if (fsend_receive_comp) | |
660 | netvsc_send_recv_completion(device, transaction_id, status); | |
661 | ||
662 | } | |
663 | ||
664 | static void netvsc_receive(struct hv_device *device, | |
665 | struct vmpacket_descriptor *packet) | |
666 | { | |
667 | struct netvsc_device *net_device; | |
668 | struct vmtransfer_page_packet_header *vmxferpage_packet; | |
669 | struct nvsp_message *nvsp_packet; | |
670 | struct hv_netvsc_packet *netvsc_packet = NULL; | |
671 | /* struct netvsc_driver *netvscDriver; */ | |
672 | struct xferpage_packet *xferpage_packet = NULL; | |
673 | int i; | |
674 | int count = 0; | |
675 | unsigned long flags; | |
676 | struct net_device *ndev; | |
677 | ||
678 | LIST_HEAD(listHead); | |
679 | ||
680 | net_device = get_inbound_net_device(device); | |
681 | if (!net_device) | |
682 | return; | |
683 | ndev = net_device->ndev; | |
684 | ||
685 | /* | |
686 | * All inbound packets other than send completion should be xfer page | |
687 | * packet | |
688 | */ | |
689 | if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { | |
690 | netdev_err(ndev, "Unknown packet type received - %d\n", | |
691 | packet->type); | |
692 | return; | |
693 | } | |
694 | ||
695 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + | |
696 | (packet->offset8 << 3)); | |
697 | ||
698 | /* Make sure this is a valid nvsp packet */ | |
699 | if (nvsp_packet->hdr.msg_type != | |
700 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { | |
701 | netdev_err(ndev, "Unknown nvsp packet type received-" | |
702 | " %d\n", nvsp_packet->hdr.msg_type); | |
703 | return; | |
704 | } | |
705 | ||
706 | vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; | |
707 | ||
708 | if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { | |
709 | netdev_err(ndev, "Invalid xfer page set id - " | |
710 | "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, | |
711 | vmxferpage_packet->xfer_pageset_id); | |
712 | return; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Grab free packets (range count + 1) to represent this xfer | |
717 | * page packet. +1 to represent the xfer page packet itself. | |
718 | * We grab it here so that we know exactly how many we can | |
719 | * fulfil | |
720 | */ | |
721 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
722 | while (!list_empty(&net_device->recv_pkt_list)) { | |
723 | list_move_tail(net_device->recv_pkt_list.next, &listHead); | |
724 | if (++count == vmxferpage_packet->range_cnt + 1) | |
725 | break; | |
726 | } | |
727 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); | |
728 | ||
729 | /* | |
730 | * We need at least 2 netvsc pkts (1 to represent the xfer | |
731 | * page and at least 1 for the range) i.e. we can handled | |
732 | * some of the xfer page packet ranges... | |
733 | */ | |
734 | if (count < 2) { | |
735 | netdev_err(ndev, "Got only %d netvsc pkt...needed " | |
736 | "%d pkts. Dropping this xfer page packet completely!\n", | |
737 | count, vmxferpage_packet->range_cnt + 1); | |
738 | ||
739 | /* Return it to the freelist */ | |
740 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
741 | for (i = count; i != 0; i--) { | |
742 | list_move_tail(listHead.next, | |
743 | &net_device->recv_pkt_list); | |
744 | } | |
745 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, | |
746 | flags); | |
747 | ||
748 | netvsc_send_recv_completion(device, | |
749 | vmxferpage_packet->d.trans_id, | |
750 | NVSP_STAT_FAIL); | |
751 | ||
752 | return; | |
753 | } | |
754 | ||
755 | /* Remove the 1st packet to represent the xfer page packet itself */ | |
756 | xferpage_packet = (struct xferpage_packet *)listHead.next; | |
757 | list_del(&xferpage_packet->list_ent); | |
758 | xferpage_packet->status = NVSP_STAT_SUCCESS; | |
759 | ||
760 | /* This is how much we can satisfy */ | |
761 | xferpage_packet->count = count - 1; | |
762 | ||
763 | if (xferpage_packet->count != vmxferpage_packet->range_cnt) { | |
764 | netdev_err(ndev, "Needed %d netvsc pkts to satisfy " | |
765 | "this xfer page...got %d\n", | |
766 | vmxferpage_packet->range_cnt, xferpage_packet->count); | |
767 | } | |
768 | ||
769 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ | |
770 | for (i = 0; i < (count - 1); i++) { | |
771 | netvsc_packet = (struct hv_netvsc_packet *)listHead.next; | |
772 | list_del(&netvsc_packet->list_ent); | |
773 | ||
774 | /* Initialize the netvsc packet */ | |
775 | netvsc_packet->status = NVSP_STAT_SUCCESS; | |
776 | netvsc_packet->xfer_page_pkt = xferpage_packet; | |
777 | netvsc_packet->completion.recv.recv_completion = | |
778 | netvsc_receive_completion; | |
779 | netvsc_packet->completion.recv.recv_completion_ctx = | |
780 | netvsc_packet; | |
781 | netvsc_packet->device = device; | |
782 | /* Save this so that we can send it back */ | |
783 | netvsc_packet->completion.recv.recv_completion_tid = | |
784 | vmxferpage_packet->d.trans_id; | |
785 | ||
786 | netvsc_packet->data = (void *)((unsigned long)net_device-> | |
787 | recv_buf + vmxferpage_packet->ranges[i].byte_offset); | |
788 | netvsc_packet->total_data_buflen = | |
789 | vmxferpage_packet->ranges[i].byte_count; | |
790 | ||
791 | /* Pass it to the upper layer */ | |
792 | rndis_filter_receive(device, netvsc_packet); | |
793 | ||
794 | netvsc_receive_completion(netvsc_packet-> | |
795 | completion.recv.recv_completion_ctx); | |
796 | } | |
797 | ||
798 | } | |
799 | ||
800 | static void netvsc_channel_cb(void *context) | |
801 | { | |
802 | int ret; | |
803 | struct hv_device *device = context; | |
804 | struct netvsc_device *net_device; | |
805 | u32 bytes_recvd; | |
806 | u64 request_id; | |
807 | unsigned char *packet; | |
808 | struct vmpacket_descriptor *desc; | |
809 | unsigned char *buffer; | |
810 | int bufferlen = NETVSC_PACKET_SIZE; | |
811 | struct net_device *ndev; | |
812 | ||
813 | packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), | |
814 | GFP_ATOMIC); | |
815 | if (!packet) | |
816 | return; | |
817 | buffer = packet; | |
818 | ||
819 | net_device = get_inbound_net_device(device); | |
820 | if (!net_device) | |
821 | goto out; | |
822 | ndev = net_device->ndev; | |
823 | ||
824 | do { | |
825 | ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, | |
826 | &bytes_recvd, &request_id); | |
827 | if (ret == 0) { | |
828 | if (bytes_recvd > 0) { | |
829 | desc = (struct vmpacket_descriptor *)buffer; | |
830 | switch (desc->type) { | |
831 | case VM_PKT_COMP: | |
832 | netvsc_send_completion(device, desc); | |
833 | break; | |
834 | ||
835 | case VM_PKT_DATA_USING_XFER_PAGES: | |
836 | netvsc_receive(device, desc); | |
837 | break; | |
838 | ||
839 | default: | |
840 | netdev_err(ndev, | |
841 | "unhandled packet type %d, " | |
842 | "tid %llx len %d\n", | |
843 | desc->type, request_id, | |
844 | bytes_recvd); | |
845 | break; | |
846 | } | |
847 | ||
848 | /* reset */ | |
849 | if (bufferlen > NETVSC_PACKET_SIZE) { | |
850 | kfree(buffer); | |
851 | buffer = packet; | |
852 | bufferlen = NETVSC_PACKET_SIZE; | |
853 | } | |
854 | } else { | |
855 | /* reset */ | |
856 | if (bufferlen > NETVSC_PACKET_SIZE) { | |
857 | kfree(buffer); | |
858 | buffer = packet; | |
859 | bufferlen = NETVSC_PACKET_SIZE; | |
860 | } | |
861 | ||
862 | break; | |
863 | } | |
864 | } else if (ret == -ENOBUFS) { | |
865 | /* Handle large packet */ | |
866 | buffer = kmalloc(bytes_recvd, GFP_ATOMIC); | |
867 | if (buffer == NULL) { | |
868 | /* Try again next time around */ | |
869 | netdev_err(ndev, | |
870 | "unable to allocate buffer of size " | |
871 | "(%d)!!\n", bytes_recvd); | |
872 | break; | |
873 | } | |
874 | ||
875 | bufferlen = bytes_recvd; | |
876 | } | |
877 | } while (1); | |
878 | ||
879 | out: | |
880 | kfree(buffer); | |
881 | return; | |
882 | } | |
883 | ||
884 | /* | |
885 | * netvsc_device_add - Callback when the device belonging to this | |
886 | * driver is added | |
887 | */ | |
888 | int netvsc_device_add(struct hv_device *device, void *additional_info) | |
889 | { | |
890 | int ret = 0; | |
891 | int i; | |
892 | int ring_size = | |
893 | ((struct netvsc_device_info *)additional_info)->ring_size; | |
894 | struct netvsc_device *net_device; | |
895 | struct hv_netvsc_packet *packet, *pos; | |
896 | struct net_device *ndev; | |
897 | ||
898 | net_device = alloc_net_device(device); | |
899 | if (!net_device) { | |
900 | ret = -ENOMEM; | |
901 | goto cleanup; | |
902 | } | |
903 | ||
904 | /* | |
905 | * Coming into this function, struct net_device * is | |
906 | * registered as the driver private data. | |
907 | * In alloc_net_device(), we register struct netvsc_device * | |
908 | * as the driver private data and stash away struct net_device * | |
909 | * in struct netvsc_device *. | |
910 | */ | |
911 | ndev = net_device->ndev; | |
912 | ||
913 | /* Initialize the NetVSC channel extension */ | |
914 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; | |
915 | spin_lock_init(&net_device->recv_pkt_list_lock); | |
916 | ||
917 | INIT_LIST_HEAD(&net_device->recv_pkt_list); | |
918 | ||
919 | for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { | |
920 | packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL); | |
921 | if (!packet) | |
922 | break; | |
923 | ||
924 | list_add_tail(&packet->list_ent, | |
925 | &net_device->recv_pkt_list); | |
926 | } | |
927 | init_completion(&net_device->channel_init_wait); | |
928 | ||
929 | /* Open the channel */ | |
930 | ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, | |
931 | ring_size * PAGE_SIZE, NULL, 0, | |
932 | netvsc_channel_cb, device); | |
933 | ||
934 | if (ret != 0) { | |
935 | netdev_err(ndev, "unable to open channel: %d\n", ret); | |
936 | goto cleanup; | |
937 | } | |
938 | ||
939 | /* Channel is opened */ | |
940 | pr_info("hv_netvsc channel opened successfully\n"); | |
941 | ||
942 | /* Connect with the NetVsp */ | |
943 | ret = netvsc_connect_vsp(device); | |
944 | if (ret != 0) { | |
945 | netdev_err(ndev, | |
946 | "unable to connect to NetVSP - %d\n", ret); | |
947 | goto close; | |
948 | } | |
949 | ||
950 | return ret; | |
951 | ||
952 | close: | |
953 | /* Now, we can close the channel safely */ | |
954 | vmbus_close(device->channel); | |
955 | ||
956 | cleanup: | |
957 | ||
958 | if (net_device) { | |
959 | list_for_each_entry_safe(packet, pos, | |
960 | &net_device->recv_pkt_list, | |
961 | list_ent) { | |
962 | list_del(&packet->list_ent); | |
963 | kfree(packet); | |
964 | } | |
965 | ||
966 | kfree(net_device); | |
967 | } | |
968 | ||
969 | return ret; | |
970 | } |