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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, see <http://www.gnu.org/licenses/>. | |
15 | * | |
16 | * Authors: | |
17 | * Haiyang Zhang <haiyangz@microsoft.com> | |
18 | * Hank Janssen <hjanssen@microsoft.com> | |
19 | */ | |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/wait.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/io.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/if_ether.h> | |
31 | ||
32 | #include "hyperv_net.h" | |
33 | ||
34 | ||
35 | static struct netvsc_device *alloc_net_device(struct hv_device *device) | |
36 | { | |
37 | struct netvsc_device *net_device; | |
38 | struct net_device *ndev = hv_get_drvdata(device); | |
39 | ||
40 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); | |
41 | if (!net_device) | |
42 | return NULL; | |
43 | ||
44 | init_waitqueue_head(&net_device->wait_drain); | |
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 | ||
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 | ||
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 | ||
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 | vfree(net_device->recv_buf); | |
140 | net_device->recv_buf = NULL; | |
141 | } | |
142 | ||
143 | if (net_device->recv_section) { | |
144 | net_device->recv_section_cnt = 0; | |
145 | kfree(net_device->recv_section); | |
146 | net_device->recv_section = NULL; | |
147 | } | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
152 | static int netvsc_init_recv_buf(struct hv_device *device) | |
153 | { | |
154 | int ret = 0; | |
155 | int t; | |
156 | struct netvsc_device *net_device; | |
157 | struct nvsp_message *init_packet; | |
158 | struct net_device *ndev; | |
159 | ||
160 | net_device = get_outbound_net_device(device); | |
161 | if (!net_device) | |
162 | return -ENODEV; | |
163 | ndev = net_device->ndev; | |
164 | ||
165 | net_device->recv_buf = vzalloc(net_device->recv_buf_size); | |
166 | if (!net_device->recv_buf) { | |
167 | netdev_err(ndev, "unable to allocate receive " | |
168 | "buffer of size %d\n", net_device->recv_buf_size); | |
169 | ret = -ENOMEM; | |
170 | goto cleanup; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Establish the gpadl handle for this buffer on this | |
175 | * channel. Note: This call uses the vmbus connection rather | |
176 | * than the channel to establish the gpadl handle. | |
177 | */ | |
178 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, | |
179 | net_device->recv_buf_size, | |
180 | &net_device->recv_buf_gpadl_handle); | |
181 | if (ret != 0) { | |
182 | netdev_err(ndev, | |
183 | "unable to establish receive buffer's gpadl\n"); | |
184 | goto cleanup; | |
185 | } | |
186 | ||
187 | ||
188 | /* Notify the NetVsp of the gpadl handle */ | |
189 | init_packet = &net_device->channel_init_pkt; | |
190 | ||
191 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
192 | ||
193 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; | |
194 | init_packet->msg.v1_msg.send_recv_buf. | |
195 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
196 | init_packet->msg.v1_msg. | |
197 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
198 | ||
199 | /* Send the gpadl notification request */ | |
200 | ret = vmbus_sendpacket(device->channel, init_packet, | |
201 | sizeof(struct nvsp_message), | |
202 | (unsigned long)init_packet, | |
203 | VM_PKT_DATA_INBAND, | |
204 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
205 | if (ret != 0) { | |
206 | netdev_err(ndev, | |
207 | "unable to send receive buffer's gpadl to netvsp\n"); | |
208 | goto cleanup; | |
209 | } | |
210 | ||
211 | t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); | |
212 | BUG_ON(t == 0); | |
213 | ||
214 | ||
215 | /* Check the response */ | |
216 | if (init_packet->msg.v1_msg. | |
217 | send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { | |
218 | netdev_err(ndev, "Unable to complete receive buffer " | |
219 | "initialization with NetVsp - status %d\n", | |
220 | init_packet->msg.v1_msg. | |
221 | send_recv_buf_complete.status); | |
222 | ret = -EINVAL; | |
223 | goto cleanup; | |
224 | } | |
225 | ||
226 | /* Parse the response */ | |
227 | ||
228 | net_device->recv_section_cnt = init_packet->msg. | |
229 | v1_msg.send_recv_buf_complete.num_sections; | |
230 | ||
231 | net_device->recv_section = kmemdup( | |
232 | init_packet->msg.v1_msg.send_recv_buf_complete.sections, | |
233 | net_device->recv_section_cnt * | |
234 | sizeof(struct nvsp_1_receive_buffer_section), | |
235 | GFP_KERNEL); | |
236 | if (net_device->recv_section == NULL) { | |
237 | ret = -EINVAL; | |
238 | goto cleanup; | |
239 | } | |
240 | ||
241 | /* | |
242 | * For 1st release, there should only be 1 section that represents the | |
243 | * entire receive buffer | |
244 | */ | |
245 | if (net_device->recv_section_cnt != 1 || | |
246 | net_device->recv_section->offset != 0) { | |
247 | ret = -EINVAL; | |
248 | goto cleanup; | |
249 | } | |
250 | ||
251 | goto exit; | |
252 | ||
253 | cleanup: | |
254 | netvsc_destroy_recv_buf(net_device); | |
255 | ||
256 | exit: | |
257 | return ret; | |
258 | } | |
259 | ||
260 | ||
261 | /* Negotiate NVSP protocol version */ | |
262 | static int negotiate_nvsp_ver(struct hv_device *device, | |
263 | struct netvsc_device *net_device, | |
264 | struct nvsp_message *init_packet, | |
265 | u32 nvsp_ver) | |
266 | { | |
267 | int ret, t; | |
268 | ||
269 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
270 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; | |
271 | init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; | |
272 | init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; | |
273 | ||
274 | /* Send the init request */ | |
275 | ret = vmbus_sendpacket(device->channel, init_packet, | |
276 | sizeof(struct nvsp_message), | |
277 | (unsigned long)init_packet, | |
278 | VM_PKT_DATA_INBAND, | |
279 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
280 | ||
281 | if (ret != 0) | |
282 | return ret; | |
283 | ||
284 | t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ); | |
285 | ||
286 | if (t == 0) | |
287 | return -ETIMEDOUT; | |
288 | ||
289 | if (init_packet->msg.init_msg.init_complete.status != | |
290 | NVSP_STAT_SUCCESS) | |
291 | return -EINVAL; | |
292 | ||
293 | if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) | |
294 | return 0; | |
295 | ||
296 | /* NVSPv2 only: Send NDIS config */ | |
297 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
298 | init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; | |
299 | init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu; | |
300 | init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; | |
301 | ||
302 | ret = vmbus_sendpacket(device->channel, init_packet, | |
303 | sizeof(struct nvsp_message), | |
304 | (unsigned long)init_packet, | |
305 | VM_PKT_DATA_INBAND, 0); | |
306 | ||
307 | return ret; | |
308 | } | |
309 | ||
310 | static int netvsc_connect_vsp(struct hv_device *device) | |
311 | { | |
312 | int ret; | |
313 | struct netvsc_device *net_device; | |
314 | struct nvsp_message *init_packet; | |
315 | int ndis_version; | |
316 | struct net_device *ndev; | |
317 | u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, | |
318 | NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; | |
319 | int i, num_ver = 4; /* number of different NVSP versions */ | |
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 | for (i = num_ver - 1; i >= 0; i--) | |
330 | if (negotiate_nvsp_ver(device, net_device, init_packet, | |
331 | ver_list[i]) == 0) { | |
332 | net_device->nvsp_version = ver_list[i]; | |
333 | break; | |
334 | } | |
335 | ||
336 | if (i < 0) { | |
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 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) | |
347 | ndis_version = 0x00060001; | |
348 | else | |
349 | ndis_version = 0x0006001e; | |
350 | ||
351 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; | |
352 | init_packet->msg.v1_msg. | |
353 | send_ndis_ver.ndis_major_ver = | |
354 | (ndis_version & 0xFFFF0000) >> 16; | |
355 | init_packet->msg.v1_msg. | |
356 | send_ndis_ver.ndis_minor_ver = | |
357 | ndis_version & 0xFFFF; | |
358 | ||
359 | /* Send the init request */ | |
360 | ret = vmbus_sendpacket(device->channel, init_packet, | |
361 | sizeof(struct nvsp_message), | |
362 | (unsigned long)init_packet, | |
363 | VM_PKT_DATA_INBAND, 0); | |
364 | if (ret != 0) | |
365 | goto cleanup; | |
366 | ||
367 | /* Post the big receive buffer to NetVSP */ | |
368 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) | |
369 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; | |
370 | else | |
371 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; | |
372 | ||
373 | ret = netvsc_init_recv_buf(device); | |
374 | ||
375 | cleanup: | |
376 | return ret; | |
377 | } | |
378 | ||
379 | static void netvsc_disconnect_vsp(struct netvsc_device *net_device) | |
380 | { | |
381 | netvsc_destroy_recv_buf(net_device); | |
382 | } | |
383 | ||
384 | /* | |
385 | * netvsc_device_remove - Callback when the root bus device is removed | |
386 | */ | |
387 | int netvsc_device_remove(struct hv_device *device) | |
388 | { | |
389 | struct netvsc_device *net_device; | |
390 | struct hv_netvsc_packet *netvsc_packet, *pos; | |
391 | unsigned long flags; | |
392 | ||
393 | net_device = hv_get_drvdata(device); | |
394 | ||
395 | netvsc_disconnect_vsp(net_device); | |
396 | ||
397 | /* | |
398 | * Since we have already drained, we don't need to busy wait | |
399 | * as was done in final_release_stor_device() | |
400 | * Note that we cannot set the ext pointer to NULL until | |
401 | * we have drained - to drain the outgoing packets, we need to | |
402 | * allow incoming packets. | |
403 | */ | |
404 | ||
405 | spin_lock_irqsave(&device->channel->inbound_lock, flags); | |
406 | hv_set_drvdata(device, NULL); | |
407 | spin_unlock_irqrestore(&device->channel->inbound_lock, flags); | |
408 | ||
409 | /* | |
410 | * At this point, no one should be accessing net_device | |
411 | * except in here | |
412 | */ | |
413 | dev_notice(&device->device, "net device safe to remove\n"); | |
414 | ||
415 | /* Now, we can close the channel safely */ | |
416 | vmbus_close(device->channel); | |
417 | ||
418 | /* Release all resources */ | |
419 | list_for_each_entry_safe(netvsc_packet, pos, | |
420 | &net_device->recv_pkt_list, list_ent) { | |
421 | list_del(&netvsc_packet->list_ent); | |
422 | kfree(netvsc_packet); | |
423 | } | |
424 | ||
425 | kfree(net_device); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | ||
430 | #define RING_AVAIL_PERCENT_HIWATER 20 | |
431 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
432 | ||
433 | /* | |
434 | * Get the percentage of available bytes to write in the ring. | |
435 | * The return value is in range from 0 to 100. | |
436 | */ | |
437 | static inline u32 hv_ringbuf_avail_percent( | |
438 | struct hv_ring_buffer_info *ring_info) | |
439 | { | |
440 | u32 avail_read, avail_write; | |
441 | ||
442 | hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); | |
443 | ||
444 | return avail_write * 100 / ring_info->ring_datasize; | |
445 | } | |
446 | ||
447 | static void netvsc_send_completion(struct netvsc_device *net_device, | |
448 | struct hv_device *device, | |
449 | struct vmpacket_descriptor *packet) | |
450 | { | |
451 | struct nvsp_message *nvsp_packet; | |
452 | struct hv_netvsc_packet *nvsc_packet; | |
453 | struct net_device *ndev; | |
454 | ||
455 | ndev = net_device->ndev; | |
456 | ||
457 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + | |
458 | (packet->offset8 << 3)); | |
459 | ||
460 | if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || | |
461 | (nvsp_packet->hdr.msg_type == | |
462 | NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || | |
463 | (nvsp_packet->hdr.msg_type == | |
464 | NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { | |
465 | /* Copy the response back */ | |
466 | memcpy(&net_device->channel_init_pkt, nvsp_packet, | |
467 | sizeof(struct nvsp_message)); | |
468 | complete(&net_device->channel_init_wait); | |
469 | } else if (nvsp_packet->hdr.msg_type == | |
470 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { | |
471 | int num_outstanding_sends; | |
472 | ||
473 | /* Get the send context */ | |
474 | nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) | |
475 | packet->trans_id; | |
476 | ||
477 | /* Notify the layer above us */ | |
478 | if (nvsc_packet) | |
479 | nvsc_packet->completion.send.send_completion( | |
480 | nvsc_packet->completion.send. | |
481 | 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 | ||
501 | int 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 | u64 req_id; | |
509 | ||
510 | net_device = get_outbound_net_device(device); | |
511 | if (!net_device) | |
512 | return -ENODEV; | |
513 | ndev = net_device->ndev; | |
514 | ||
515 | sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; | |
516 | if (packet->is_data_pkt) { | |
517 | /* 0 is RMC_DATA; */ | |
518 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; | |
519 | } else { | |
520 | /* 1 is RMC_CONTROL; */ | |
521 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; | |
522 | } | |
523 | ||
524 | /* Not using send buffer section */ | |
525 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = | |
526 | 0xFFFFFFFF; | |
527 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; | |
528 | ||
529 | if (packet->completion.send.send_completion) | |
530 | req_id = (ulong)packet; | |
531 | else | |
532 | req_id = 0; | |
533 | ||
534 | if (packet->page_buf_cnt) { | |
535 | ret = vmbus_sendpacket_pagebuffer(device->channel, | |
536 | packet->page_buf, | |
537 | packet->page_buf_cnt, | |
538 | &sendMessage, | |
539 | sizeof(struct nvsp_message), | |
540 | req_id); | |
541 | } else { | |
542 | ret = vmbus_sendpacket(device->channel, &sendMessage, | |
543 | sizeof(struct nvsp_message), | |
544 | req_id, | |
545 | VM_PKT_DATA_INBAND, | |
546 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
547 | } | |
548 | ||
549 | if (ret == 0) { | |
550 | atomic_inc(&net_device->num_outstanding_sends); | |
551 | if (hv_ringbuf_avail_percent(&device->channel->outbound) < | |
552 | RING_AVAIL_PERCENT_LOWATER) { | |
553 | netif_stop_queue(ndev); | |
554 | if (atomic_read(&net_device-> | |
555 | num_outstanding_sends) < 1) | |
556 | netif_wake_queue(ndev); | |
557 | } | |
558 | } else if (ret == -EAGAIN) { | |
559 | netif_stop_queue(ndev); | |
560 | if (atomic_read(&net_device->num_outstanding_sends) < 1) { | |
561 | netif_wake_queue(ndev); | |
562 | ret = -ENOSPC; | |
563 | } | |
564 | } else { | |
565 | netdev_err(ndev, "Unable to send packet %p ret %d\n", | |
566 | packet, ret); | |
567 | } | |
568 | ||
569 | return ret; | |
570 | } | |
571 | ||
572 | static void netvsc_send_recv_completion(struct hv_device *device, | |
573 | struct netvsc_device *net_device, | |
574 | u64 transaction_id, u32 status) | |
575 | { | |
576 | struct nvsp_message recvcompMessage; | |
577 | int retries = 0; | |
578 | int ret; | |
579 | struct net_device *ndev; | |
580 | ||
581 | ndev = net_device->ndev; | |
582 | ||
583 | recvcompMessage.hdr.msg_type = | |
584 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; | |
585 | ||
586 | recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; | |
587 | ||
588 | retry_send_cmplt: | |
589 | /* Send the completion */ | |
590 | ret = vmbus_sendpacket(device->channel, &recvcompMessage, | |
591 | sizeof(struct nvsp_message), transaction_id, | |
592 | VM_PKT_COMP, 0); | |
593 | if (ret == 0) { | |
594 | /* success */ | |
595 | /* no-op */ | |
596 | } else if (ret == -EAGAIN) { | |
597 | /* no more room...wait a bit and attempt to retry 3 times */ | |
598 | retries++; | |
599 | netdev_err(ndev, "unable to send receive completion pkt" | |
600 | " (tid %llx)...retrying %d\n", transaction_id, retries); | |
601 | ||
602 | if (retries < 4) { | |
603 | udelay(100); | |
604 | goto retry_send_cmplt; | |
605 | } else { | |
606 | netdev_err(ndev, "unable to send receive " | |
607 | "completion pkt (tid %llx)...give up retrying\n", | |
608 | transaction_id); | |
609 | } | |
610 | } else { | |
611 | netdev_err(ndev, "unable to send receive " | |
612 | "completion pkt - %llx\n", transaction_id); | |
613 | } | |
614 | } | |
615 | ||
616 | /* Send a receive completion packet to RNDIS device (ie NetVsp) */ | |
617 | static void netvsc_receive_completion(void *context) | |
618 | { | |
619 | struct hv_netvsc_packet *packet = context; | |
620 | struct hv_device *device = packet->device; | |
621 | struct netvsc_device *net_device; | |
622 | u64 transaction_id = 0; | |
623 | bool fsend_receive_comp = false; | |
624 | unsigned long flags; | |
625 | struct net_device *ndev; | |
626 | u32 status = NVSP_STAT_NONE; | |
627 | ||
628 | /* | |
629 | * Even though it seems logical to do a GetOutboundNetDevice() here to | |
630 | * send out receive completion, we are using GetInboundNetDevice() | |
631 | * since we may have disable outbound traffic already. | |
632 | */ | |
633 | net_device = get_inbound_net_device(device); | |
634 | if (!net_device) | |
635 | return; | |
636 | ndev = net_device->ndev; | |
637 | ||
638 | /* Overloading use of the lock. */ | |
639 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
640 | ||
641 | if (packet->status != NVSP_STAT_SUCCESS) | |
642 | packet->xfer_page_pkt->status = NVSP_STAT_FAIL; | |
643 | ||
644 | packet->xfer_page_pkt->count--; | |
645 | ||
646 | /* | |
647 | * Last one in the line that represent 1 xfer page packet. | |
648 | * Return the xfer page packet itself to the freelist | |
649 | */ | |
650 | if (packet->xfer_page_pkt->count == 0) { | |
651 | fsend_receive_comp = true; | |
652 | transaction_id = packet->completion.recv.recv_completion_tid; | |
653 | status = packet->xfer_page_pkt->status; | |
654 | list_add_tail(&packet->xfer_page_pkt->list_ent, | |
655 | &net_device->recv_pkt_list); | |
656 | ||
657 | } | |
658 | ||
659 | /* Put the packet back */ | |
660 | list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); | |
661 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); | |
662 | ||
663 | /* Send a receive completion for the xfer page packet */ | |
664 | if (fsend_receive_comp) | |
665 | netvsc_send_recv_completion(device, net_device, transaction_id, | |
666 | status); | |
667 | ||
668 | } | |
669 | ||
670 | static void netvsc_receive(struct netvsc_device *net_device, | |
671 | struct hv_device *device, | |
672 | struct vmpacket_descriptor *packet) | |
673 | { | |
674 | struct vmtransfer_page_packet_header *vmxferpage_packet; | |
675 | struct nvsp_message *nvsp_packet; | |
676 | struct hv_netvsc_packet *netvsc_packet = NULL; | |
677 | /* struct netvsc_driver *netvscDriver; */ | |
678 | struct xferpage_packet *xferpage_packet = NULL; | |
679 | int i; | |
680 | int count = 0; | |
681 | unsigned long flags; | |
682 | struct net_device *ndev; | |
683 | ||
684 | LIST_HEAD(listHead); | |
685 | ||
686 | ndev = net_device->ndev; | |
687 | ||
688 | /* | |
689 | * All inbound packets other than send completion should be xfer page | |
690 | * packet | |
691 | */ | |
692 | if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { | |
693 | netdev_err(ndev, "Unknown packet type received - %d\n", | |
694 | packet->type); | |
695 | return; | |
696 | } | |
697 | ||
698 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + | |
699 | (packet->offset8 << 3)); | |
700 | ||
701 | /* Make sure this is a valid nvsp packet */ | |
702 | if (nvsp_packet->hdr.msg_type != | |
703 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { | |
704 | netdev_err(ndev, "Unknown nvsp packet type received-" | |
705 | " %d\n", nvsp_packet->hdr.msg_type); | |
706 | return; | |
707 | } | |
708 | ||
709 | vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; | |
710 | ||
711 | if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { | |
712 | netdev_err(ndev, "Invalid xfer page set id - " | |
713 | "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, | |
714 | vmxferpage_packet->xfer_pageset_id); | |
715 | return; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Grab free packets (range count + 1) to represent this xfer | |
720 | * page packet. +1 to represent the xfer page packet itself. | |
721 | * We grab it here so that we know exactly how many we can | |
722 | * fulfil | |
723 | */ | |
724 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
725 | while (!list_empty(&net_device->recv_pkt_list)) { | |
726 | list_move_tail(net_device->recv_pkt_list.next, &listHead); | |
727 | if (++count == vmxferpage_packet->range_cnt + 1) | |
728 | break; | |
729 | } | |
730 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); | |
731 | ||
732 | /* | |
733 | * We need at least 2 netvsc pkts (1 to represent the xfer | |
734 | * page and at least 1 for the range) i.e. we can handled | |
735 | * some of the xfer page packet ranges... | |
736 | */ | |
737 | if (count < 2) { | |
738 | netdev_err(ndev, "Got only %d netvsc pkt...needed " | |
739 | "%d pkts. Dropping this xfer page packet completely!\n", | |
740 | count, vmxferpage_packet->range_cnt + 1); | |
741 | ||
742 | /* Return it to the freelist */ | |
743 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); | |
744 | for (i = count; i != 0; i--) { | |
745 | list_move_tail(listHead.next, | |
746 | &net_device->recv_pkt_list); | |
747 | } | |
748 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, | |
749 | flags); | |
750 | ||
751 | netvsc_send_recv_completion(device, net_device, | |
752 | vmxferpage_packet->d.trans_id, | |
753 | NVSP_STAT_FAIL); | |
754 | ||
755 | return; | |
756 | } | |
757 | ||
758 | /* Remove the 1st packet to represent the xfer page packet itself */ | |
759 | xferpage_packet = (struct xferpage_packet *)listHead.next; | |
760 | list_del(&xferpage_packet->list_ent); | |
761 | xferpage_packet->status = NVSP_STAT_SUCCESS; | |
762 | ||
763 | /* This is how much we can satisfy */ | |
764 | xferpage_packet->count = count - 1; | |
765 | ||
766 | if (xferpage_packet->count != vmxferpage_packet->range_cnt) { | |
767 | netdev_err(ndev, "Needed %d netvsc pkts to satisfy " | |
768 | "this xfer page...got %d\n", | |
769 | vmxferpage_packet->range_cnt, xferpage_packet->count); | |
770 | } | |
771 | ||
772 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ | |
773 | for (i = 0; i < (count - 1); i++) { | |
774 | netvsc_packet = (struct hv_netvsc_packet *)listHead.next; | |
775 | list_del(&netvsc_packet->list_ent); | |
776 | ||
777 | /* Initialize the netvsc packet */ | |
778 | netvsc_packet->status = NVSP_STAT_SUCCESS; | |
779 | netvsc_packet->xfer_page_pkt = xferpage_packet; | |
780 | netvsc_packet->completion.recv.recv_completion = | |
781 | netvsc_receive_completion; | |
782 | netvsc_packet->completion.recv.recv_completion_ctx = | |
783 | netvsc_packet; | |
784 | netvsc_packet->device = device; | |
785 | /* Save this so that we can send it back */ | |
786 | netvsc_packet->completion.recv.recv_completion_tid = | |
787 | vmxferpage_packet->d.trans_id; | |
788 | ||
789 | netvsc_packet->data = (void *)((unsigned long)net_device-> | |
790 | recv_buf + vmxferpage_packet->ranges[i].byte_offset); | |
791 | netvsc_packet->total_data_buflen = | |
792 | vmxferpage_packet->ranges[i].byte_count; | |
793 | ||
794 | /* Pass it to the upper layer */ | |
795 | rndis_filter_receive(device, netvsc_packet); | |
796 | ||
797 | netvsc_receive_completion(netvsc_packet-> | |
798 | completion.recv.recv_completion_ctx); | |
799 | } | |
800 | ||
801 | } | |
802 | ||
803 | static void netvsc_channel_cb(void *context) | |
804 | { | |
805 | int ret; | |
806 | struct hv_device *device = context; | |
807 | struct netvsc_device *net_device; | |
808 | u32 bytes_recvd; | |
809 | u64 request_id; | |
810 | struct vmpacket_descriptor *desc; | |
811 | unsigned char *buffer; | |
812 | int bufferlen = NETVSC_PACKET_SIZE; | |
813 | struct net_device *ndev; | |
814 | ||
815 | net_device = get_inbound_net_device(device); | |
816 | if (!net_device) | |
817 | return; | |
818 | ndev = net_device->ndev; | |
819 | buffer = net_device->cb_buffer; | |
820 | ||
821 | do { | |
822 | ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, | |
823 | &bytes_recvd, &request_id); | |
824 | if (ret == 0) { | |
825 | if (bytes_recvd > 0) { | |
826 | desc = (struct vmpacket_descriptor *)buffer; | |
827 | switch (desc->type) { | |
828 | case VM_PKT_COMP: | |
829 | netvsc_send_completion(net_device, | |
830 | device, desc); | |
831 | break; | |
832 | ||
833 | case VM_PKT_DATA_USING_XFER_PAGES: | |
834 | netvsc_receive(net_device, | |
835 | device, desc); | |
836 | break; | |
837 | ||
838 | default: | |
839 | netdev_err(ndev, | |
840 | "unhandled packet type %d, " | |
841 | "tid %llx len %d\n", | |
842 | desc->type, request_id, | |
843 | bytes_recvd); | |
844 | break; | |
845 | } | |
846 | ||
847 | } else { | |
848 | /* | |
849 | * We are done for this pass. | |
850 | */ | |
851 | break; | |
852 | } | |
853 | ||
854 | } else if (ret == -ENOBUFS) { | |
855 | if (bufferlen > NETVSC_PACKET_SIZE) | |
856 | kfree(buffer); | |
857 | /* Handle large packet */ | |
858 | buffer = kmalloc(bytes_recvd, GFP_ATOMIC); | |
859 | if (buffer == NULL) { | |
860 | /* Try again next time around */ | |
861 | netdev_err(ndev, | |
862 | "unable to allocate buffer of size " | |
863 | "(%d)!!\n", bytes_recvd); | |
864 | break; | |
865 | } | |
866 | ||
867 | bufferlen = bytes_recvd; | |
868 | } | |
869 | } while (1); | |
870 | ||
871 | if (bufferlen > NETVSC_PACKET_SIZE) | |
872 | kfree(buffer); | |
873 | return; | |
874 | } | |
875 | ||
876 | /* | |
877 | * netvsc_device_add - Callback when the device belonging to this | |
878 | * driver is added | |
879 | */ | |
880 | int netvsc_device_add(struct hv_device *device, void *additional_info) | |
881 | { | |
882 | int ret = 0; | |
883 | int i; | |
884 | int ring_size = | |
885 | ((struct netvsc_device_info *)additional_info)->ring_size; | |
886 | struct netvsc_device *net_device; | |
887 | struct hv_netvsc_packet *packet, *pos; | |
888 | struct net_device *ndev; | |
889 | ||
890 | net_device = alloc_net_device(device); | |
891 | if (!net_device) { | |
892 | ret = -ENOMEM; | |
893 | goto cleanup; | |
894 | } | |
895 | ||
896 | /* | |
897 | * Coming into this function, struct net_device * is | |
898 | * registered as the driver private data. | |
899 | * In alloc_net_device(), we register struct netvsc_device * | |
900 | * as the driver private data and stash away struct net_device * | |
901 | * in struct netvsc_device *. | |
902 | */ | |
903 | ndev = net_device->ndev; | |
904 | ||
905 | /* Initialize the NetVSC channel extension */ | |
906 | spin_lock_init(&net_device->recv_pkt_list_lock); | |
907 | ||
908 | INIT_LIST_HEAD(&net_device->recv_pkt_list); | |
909 | ||
910 | for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { | |
911 | packet = kzalloc(sizeof(struct hv_netvsc_packet), GFP_KERNEL); | |
912 | if (!packet) | |
913 | break; | |
914 | ||
915 | list_add_tail(&packet->list_ent, | |
916 | &net_device->recv_pkt_list); | |
917 | } | |
918 | init_completion(&net_device->channel_init_wait); | |
919 | ||
920 | /* Open the channel */ | |
921 | ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, | |
922 | ring_size * PAGE_SIZE, NULL, 0, | |
923 | netvsc_channel_cb, device); | |
924 | ||
925 | if (ret != 0) { | |
926 | netdev_err(ndev, "unable to open channel: %d\n", ret); | |
927 | goto cleanup; | |
928 | } | |
929 | ||
930 | /* Channel is opened */ | |
931 | pr_info("hv_netvsc channel opened successfully\n"); | |
932 | ||
933 | /* Connect with the NetVsp */ | |
934 | ret = netvsc_connect_vsp(device); | |
935 | if (ret != 0) { | |
936 | netdev_err(ndev, | |
937 | "unable to connect to NetVSP - %d\n", ret); | |
938 | goto close; | |
939 | } | |
940 | ||
941 | return ret; | |
942 | ||
943 | close: | |
944 | /* Now, we can close the channel safely */ | |
945 | vmbus_close(device->channel); | |
946 | ||
947 | cleanup: | |
948 | ||
949 | if (net_device) { | |
950 | list_for_each_entry_safe(packet, pos, | |
951 | &net_device->recv_pkt_list, | |
952 | list_ent) { | |
953 | list_del(&packet->list_ent); | |
954 | kfree(packet); | |
955 | } | |
956 | ||
957 | kfree(net_device); | |
958 | } | |
959 | ||
960 | return ret; | |
961 | } |