Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
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> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
5654e932 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c88c4e4c | 28 | #include <linux/module.h> |
46a97191 | 29 | #include <linux/hyperv.h> |
011a7c3c | 30 | #include <linux/uio.h> |
3f335ea2 | 31 | |
0f2a6619 | 32 | #include "hyperv_vmbus.h" |
3e7ee490 | 33 | |
e3fe0bb6 S |
34 | #define NUM_PAGES_SPANNED(addr, len) \ |
35 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
36 | ||
3e189519 | 37 | /* |
fff41b2e | 38 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 39 | * channel. |
f4266e34 | 40 | */ |
fff41b2e | 41 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 42 | { |
39d70a4a | 43 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 44 | |
c50f7fb2 | 45 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 46 | /* Each u32 represents 32 channels */ |
22356585 | 47 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 48 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 49 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 50 | |
8681db44 GKH |
51 | /* Get the child to parent monitor page */ |
52 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 53 | |
22356585 | 54 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
55 | (unsigned long *)&monitorpage->trigger_group |
56 | [channel->monitor_grp].pending); | |
7c369f40 | 57 | |
f4266e34 | 58 | } else { |
21c3bef5 | 59 | vmbus_set_event(channel); |
3e7ee490 | 60 | } |
3e7ee490 HJ |
61 | } |
62 | ||
3e189519 | 63 | /* |
fff41b2e | 64 | * vmbus_open - Open the specified channel. |
f4266e34 | 65 | */ |
fff41b2e | 66 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
67 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
68 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 69 | { |
0987ff69 | 70 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 71 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 72 | void *in, *out; |
dd0813b6 | 73 | unsigned long flags; |
9568a193 | 74 | int ret, t, err = 0; |
3e7ee490 | 75 | |
e68d2971 S |
76 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
77 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
78 | newchannel->state = CHANNEL_OPENING_STATE; | |
79 | } else { | |
80 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
81 | return -EINVAL; | |
82 | } | |
83 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
84 | ||
c50f7fb2 HZ |
85 | newchannel->onchannel_callback = onchannelcallback; |
86 | newchannel->channel_callback_context = context; | |
3e7ee490 | 87 | |
454f18a9 | 88 | /* Allocate the ring buffer */ |
df3493e0 S |
89 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
90 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
91 | ||
7e052d98 BP |
92 | if (!out) |
93 | return -ENOMEM; | |
94 | ||
3e7ee490 | 95 | |
39d70a4a | 96 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 97 | |
c50f7fb2 HZ |
98 | newchannel->ringbuffer_pages = out; |
99 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 100 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 101 | |
72a95cbc S |
102 | ret = hv_ringbuffer_init( |
103 | &newchannel->outbound, out, send_ringbuffer_size); | |
104 | ||
fd4dc88e | 105 | if (ret != 0) { |
3324fb40 | 106 | err = ret; |
13925502 | 107 | goto error0; |
3324fb40 BP |
108 | } |
109 | ||
72a95cbc S |
110 | ret = hv_ringbuffer_init( |
111 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 112 | if (ret != 0) { |
3324fb40 | 113 | err = ret; |
13925502 | 114 | goto error0; |
3324fb40 | 115 | } |
3e7ee490 | 116 | |
3e7ee490 | 117 | |
454f18a9 | 118 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 119 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 120 | |
fff41b2e | 121 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 122 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
123 | send_ringbuffer_size + |
124 | recv_ringbuffer_size, | |
c50f7fb2 | 125 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 126 | |
fd4dc88e | 127 | if (ret != 0) { |
b94ef345 | 128 | err = ret; |
13925502 | 129 | goto error0; |
b94ef345 | 130 | } |
f4266e34 | 131 | |
454f18a9 | 132 | /* Create and init the channel open message */ |
176fb9e3 | 133 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
134 | sizeof(struct vmbus_channel_open_channel), |
135 | GFP_KERNEL); | |
176fb9e3 | 136 | if (!open_info) { |
c3bf2e26 | 137 | err = -ENOMEM; |
13925502 | 138 | goto error0; |
c3bf2e26 | 139 | } |
3e7ee490 | 140 | |
176fb9e3 | 141 | init_completion(&open_info->waitevent); |
3e7ee490 | 142 | |
176fb9e3 | 143 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
144 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
145 | open_msg->openid = newchannel->offermsg.child_relid; | |
146 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
147 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
148 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 149 | PAGE_SHIFT; |
abbf3b2a | 150 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 151 | |
39d70a4a | 152 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 153 | err = -EINVAL; |
13925502 | 154 | goto error0; |
c827f944 BP |
155 | } |
156 | ||
39d70a4a | 157 | if (userdatalen) |
0987ff69 | 158 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 159 | |
15b2f647 | 160 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 161 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 162 | &vmbus_connection.chn_msg_list); |
15b2f647 | 163 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 164 | |
0987ff69 | 165 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 166 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 167 | |
45d727ce S |
168 | if (ret != 0) { |
169 | err = ret; | |
13925502 | 170 | goto error1; |
45d727ce | 171 | } |
3e7ee490 | 172 | |
176fb9e3 | 173 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 174 | if (t == 0) { |
0c3b7b2f | 175 | err = -ETIMEDOUT; |
13925502 | 176 | goto error1; |
0c3b7b2f S |
177 | } |
178 | ||
3e7ee490 | 179 | |
176fb9e3 S |
180 | if (open_info->response.open_result.status) |
181 | err = open_info->response.open_result.status; | |
3e7ee490 | 182 | |
15b2f647 | 183 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 184 | list_del(&open_info->msglistentry); |
15b2f647 | 185 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 186 | |
e68d2971 S |
187 | if (err == 0) |
188 | newchannel->state = CHANNEL_OPENED_STATE; | |
189 | ||
176fb9e3 | 190 | kfree(open_info); |
98e08702 | 191 | return err; |
c3bf2e26 | 192 | |
13925502 S |
193 | error1: |
194 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
195 | list_del(&open_info->msglistentry); | |
196 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
197 | ||
198 | error0: | |
df3493e0 S |
199 | free_pages((unsigned long)out, |
200 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 201 | kfree(open_info); |
c3bf2e26 | 202 | return err; |
3e7ee490 | 203 | } |
36ceadfc | 204 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 205 | |
3e189519 | 206 | /* |
fff41b2e | 207 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 208 | */ |
fff41b2e | 209 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
210 | struct vmbus_channel_msginfo **msginfo, |
211 | u32 *messagecount) | |
3e7ee490 HJ |
212 | { |
213 | int i; | |
39d70a4a | 214 | int pagecount; |
39d70a4a HZ |
215 | struct vmbus_channel_gpadl_header *gpadl_header; |
216 | struct vmbus_channel_gpadl_body *gpadl_body; | |
217 | struct vmbus_channel_msginfo *msgheader; | |
218 | struct vmbus_channel_msginfo *msgbody = NULL; | |
219 | u32 msgsize; | |
3e7ee490 | 220 | |
39d70a4a | 221 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 222 | |
39d70a4a | 223 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 224 | |
454f18a9 | 225 | /* do we need a gpadl body msg */ |
39d70a4a | 226 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
227 | sizeof(struct vmbus_channel_gpadl_header) - |
228 | sizeof(struct gpa_range); | |
39d70a4a | 229 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 230 | |
39d70a4a | 231 | if (pagecount > pfncount) { |
f4266e34 | 232 | /* we need a gpadl body */ |
454f18a9 | 233 | /* fill in the header */ |
39d70a4a | 234 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 235 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
236 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
237 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
238 | if (!msgheader) | |
d1c250bb | 239 | goto nomem; |
3e7ee490 | 240 | |
c50f7fb2 HZ |
241 | INIT_LIST_HEAD(&msgheader->submsglist); |
242 | msgheader->msgsize = msgsize; | |
3e7ee490 | 243 | |
39d70a4a | 244 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
245 | msgheader->msg; |
246 | gpadl_header->rangecount = 1; | |
247 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 248 | pagecount * sizeof(u64); |
415f2287 HZ |
249 | gpadl_header->range[0].byte_offset = 0; |
250 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 251 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
252 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
253 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
254 | *msginfo = msgheader; |
255 | *messagecount = 1; | |
3e7ee490 | 256 | |
39d70a4a HZ |
257 | pfnsum = pfncount; |
258 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 259 | |
454f18a9 | 260 | /* how many pfns can we fit */ |
39d70a4a | 261 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 262 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 263 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 264 | |
454f18a9 | 265 | /* fill in the body */ |
39d70a4a HZ |
266 | while (pfnleft) { |
267 | if (pfnleft > pfncount) | |
268 | pfncurr = pfncount; | |
3e7ee490 | 269 | else |
39d70a4a | 270 | pfncurr = pfnleft; |
3e7ee490 | 271 | |
39d70a4a | 272 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 273 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
274 | pfncurr * sizeof(u64); |
275 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
276 | |
277 | if (!msgbody) { | |
278 | struct vmbus_channel_msginfo *pos = NULL; | |
279 | struct vmbus_channel_msginfo *tmp = NULL; | |
280 | /* | |
281 | * Free up all the allocated messages. | |
282 | */ | |
283 | list_for_each_entry_safe(pos, tmp, | |
284 | &msgheader->submsglist, | |
285 | msglistentry) { | |
286 | ||
287 | list_del(&pos->msglistentry); | |
288 | kfree(pos); | |
289 | } | |
290 | ||
d1c250bb | 291 | goto nomem; |
f38cf9cc S |
292 | } |
293 | ||
c50f7fb2 | 294 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
295 | (*messagecount)++; |
296 | gpadl_body = | |
c50f7fb2 | 297 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
298 | |
299 | /* | |
f4266e34 GKH |
300 | * Gpadl is u32 and we are using a pointer which could |
301 | * be 64-bit | |
f27df643 S |
302 | * This is governed by the guest/host protocol and |
303 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 304 | */ |
39d70a4a | 305 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
306 | gpadl_body->pfn[i] = slow_virt_to_phys( |
307 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
308 | PAGE_SHIFT; | |
3e7ee490 | 309 | |
454f18a9 | 310 | /* add to msg header */ |
c50f7fb2 HZ |
311 | list_add_tail(&msgbody->msglistentry, |
312 | &msgheader->submsglist); | |
39d70a4a HZ |
313 | pfnsum += pfncurr; |
314 | pfnleft -= pfncurr; | |
3e7ee490 | 315 | } |
f4266e34 | 316 | } else { |
454f18a9 | 317 | /* everything fits in a header */ |
39d70a4a | 318 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 319 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
320 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
321 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
322 | if (msgheader == NULL) | |
e3eb7cdd | 323 | goto nomem; |
c50f7fb2 | 324 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
325 | |
326 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
327 | msgheader->msg; |
328 | gpadl_header->rangecount = 1; | |
329 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 330 | pagecount * sizeof(u64); |
415f2287 HZ |
331 | gpadl_header->range[0].byte_offset = 0; |
332 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 333 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
334 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
335 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
336 | |
337 | *msginfo = msgheader; | |
338 | *messagecount = 1; | |
3e7ee490 HJ |
339 | } |
340 | ||
341 | return 0; | |
d1c250bb | 342 | nomem: |
39d70a4a HZ |
343 | kfree(msgheader); |
344 | kfree(msgbody); | |
d1c250bb | 345 | return -ENOMEM; |
3e7ee490 HJ |
346 | } |
347 | ||
3e189519 | 348 | /* |
fff41b2e | 349 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 350 | * |
39d70a4a | 351 | * @channel: a channel |
b679ef73 | 352 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
353 | * @size: page-size multiple |
354 | * @gpadl_handle: some funky thing | |
f4266e34 | 355 | */ |
fff41b2e | 356 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 357 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 358 | { |
39d70a4a HZ |
359 | struct vmbus_channel_gpadl_header *gpadlmsg; |
360 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
361 | struct vmbus_channel_msginfo *msginfo = NULL; |
362 | struct vmbus_channel_msginfo *submsginfo; | |
363 | u32 msgcount; | |
53af545b | 364 | struct list_head *curr; |
39d70a4a | 365 | u32 next_gpadl_handle; |
dd0813b6 | 366 | unsigned long flags; |
c3bf2e26 | 367 | int ret = 0; |
3e7ee490 | 368 | |
9f52a163 S |
369 | next_gpadl_handle = |
370 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 371 | |
fff41b2e | 372 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
373 | if (ret) |
374 | return ret; | |
3e7ee490 | 375 | |
9568a193 | 376 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 377 | |
c50f7fb2 HZ |
378 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
379 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
380 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
381 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 382 | |
3e7ee490 | 383 | |
15b2f647 | 384 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 385 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 386 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 387 | |
15b2f647 | 388 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 389 | |
c6977677 | 390 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 391 | sizeof(*msginfo)); |
98e08702 | 392 | if (ret != 0) |
00d760b0 | 393 | goto cleanup; |
3e7ee490 | 394 | |
39d70a4a | 395 | if (msgcount > 1) { |
c50f7fb2 | 396 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 397 | |
39d70a4a HZ |
398 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
399 | gpadl_body = | |
c50f7fb2 | 400 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 401 | |
c50f7fb2 HZ |
402 | gpadl_body->header.msgtype = |
403 | CHANNELMSG_GPADL_BODY; | |
404 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 405 | |
c6977677 | 406 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 407 | submsginfo->msgsize - |
39d70a4a | 408 | sizeof(*submsginfo)); |
fd4dc88e | 409 | if (ret != 0) |
00d760b0 | 410 | goto cleanup; |
99259159 | 411 | |
3e7ee490 HJ |
412 | } |
413 | } | |
72c6b71c | 414 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 415 | |
454f18a9 | 416 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 417 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 418 | |
00d760b0 | 419 | cleanup: |
15b2f647 | 420 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 421 | list_del(&msginfo->msglistentry); |
15b2f647 | 422 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 423 | |
39d70a4a | 424 | kfree(msginfo); |
3e7ee490 HJ |
425 | return ret; |
426 | } | |
98873724 | 427 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 428 | |
3e189519 | 429 | /* |
fff41b2e | 430 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 431 | */ |
fff41b2e | 432 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 433 | { |
82250213 | 434 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 435 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 436 | unsigned long flags; |
66be6530 | 437 | int ret; |
3e7ee490 | 438 | |
f4266e34 GKH |
439 | info = kmalloc(sizeof(*info) + |
440 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
441 | if (!info) |
442 | return -ENOMEM; | |
3e7ee490 | 443 | |
9568a193 | 444 | init_completion(&info->waitevent); |
3e7ee490 | 445 | |
c50f7fb2 | 446 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 447 | |
c50f7fb2 HZ |
448 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
449 | msg->child_relid = channel->offermsg.child_relid; | |
450 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 451 | |
15b2f647 | 452 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 453 | list_add_tail(&info->msglistentry, |
da9fcb72 | 454 | &vmbus_connection.chn_msg_list); |
15b2f647 | 455 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 456 | ret = vmbus_post_msg(msg, |
f4266e34 | 457 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 458 | |
66be6530 S |
459 | if (ret) |
460 | goto post_msg_err; | |
461 | ||
462 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 463 | |
66be6530 | 464 | post_msg_err: |
15b2f647 | 465 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 466 | list_del(&info->msglistentry); |
15b2f647 | 467 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 468 | |
8c69f52a | 469 | kfree(info); |
3e7ee490 HJ |
470 | return ret; |
471 | } | |
18726d7a | 472 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 473 | |
d3ba720d S |
474 | static void reset_channel_cb(void *arg) |
475 | { | |
476 | struct vmbus_channel *channel = arg; | |
477 | ||
478 | channel->onchannel_callback = NULL; | |
479 | } | |
480 | ||
98d731bb | 481 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 482 | { |
82250213 | 483 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 484 | int ret; |
3e7ee490 | 485 | |
e68d2971 S |
486 | channel->state = CHANNEL_OPEN_STATE; |
487 | channel->sc_creation_callback = NULL; | |
454f18a9 | 488 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
489 | if (channel->target_cpu != get_cpu()) { |
490 | put_cpu(); | |
d3ba720d S |
491 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
492 | channel, true); | |
2115b561 | 493 | } else { |
d3ba720d | 494 | reset_channel_cb(channel); |
2115b561 S |
495 | put_cpu(); |
496 | } | |
3e7ee490 | 497 | |
454f18a9 | 498 | /* Send a closing message */ |
3e7ee490 | 499 | |
e9a27a9f | 500 | msg = &channel->close_msg.msg; |
3e7ee490 | 501 | |
c50f7fb2 HZ |
502 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
503 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 504 | |
c6977677 | 505 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 506 | |
98d731bb S |
507 | if (ret) { |
508 | pr_err("Close failed: close post msg return is %d\n", ret); | |
509 | /* | |
510 | * If we failed to post the close msg, | |
511 | * it is perhaps better to leak memory. | |
512 | */ | |
513 | return ret; | |
514 | } | |
515 | ||
454f18a9 | 516 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
517 | if (channel->ringbuffer_gpadlhandle) { |
518 | ret = vmbus_teardown_gpadl(channel, | |
519 | channel->ringbuffer_gpadlhandle); | |
520 | if (ret) { | |
521 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
522 | /* | |
523 | * If we failed to teardown gpadl, | |
524 | * it is perhaps better to leak memory. | |
525 | */ | |
526 | return ret; | |
527 | } | |
528 | } | |
3e7ee490 | 529 | |
454f18a9 | 530 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
531 | hv_ringbuffer_cleanup(&channel->outbound); |
532 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 533 | |
df3493e0 S |
534 | free_pages((unsigned long)channel->ringbuffer_pages, |
535 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 536 | |
98d731bb | 537 | return ret; |
3e7ee490 | 538 | } |
e68d2971 S |
539 | |
540 | /* | |
541 | * vmbus_close - Close the specified channel | |
542 | */ | |
543 | void vmbus_close(struct vmbus_channel *channel) | |
544 | { | |
545 | struct list_head *cur, *tmp; | |
546 | struct vmbus_channel *cur_channel; | |
547 | ||
548 | if (channel->primary_channel != NULL) { | |
549 | /* | |
550 | * We will only close sub-channels when | |
551 | * the primary is closed. | |
552 | */ | |
553 | return; | |
554 | } | |
555 | /* | |
556 | * Close all the sub-channels first and then close the | |
557 | * primary channel. | |
558 | */ | |
559 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
560 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
561 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
562 | continue; | |
563 | vmbus_close_internal(cur_channel); | |
564 | } | |
565 | /* | |
566 | * Now close the primary. | |
567 | */ | |
568 | vmbus_close_internal(channel); | |
569 | } | |
70bfa307 | 570 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 571 | |
c88c4e4c | 572 | /** |
fff41b2e | 573 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
574 | * @channel: Pointer to vmbus_channel structure. |
575 | * @buffer: Pointer to the buffer you want to receive the data into. | |
576 | * @bufferlen: Maximum size of what the the buffer will hold | |
577 | * @requestid: Identifier of the request | |
578 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
579 | * packet etc. |
580 | * | |
39d70a4a | 581 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
582 | * This will send the data unparsed to hyper-v. |
583 | * | |
584 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 585 | */ |
011a7c3c | 586 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
587 | u32 bufferlen, u64 requestid, |
588 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 589 | { |
8dc0a06a | 590 | struct vmpacket_descriptor desc; |
39d70a4a | 591 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 592 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 593 | struct kvec bufferlist[3]; |
39d70a4a | 594 | u64 aligned_data = 0; |
f4266e34 | 595 | int ret; |
98fa8cf4 | 596 | bool signal = false; |
3e7ee490 | 597 | |
3e7ee490 | 598 | |
454f18a9 | 599 | /* Setup the descriptor */ |
415f2287 HZ |
600 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
601 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 602 | /* in 8-bytes granularity */ |
415f2287 HZ |
603 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
604 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
605 | desc.trans_id = requestid; | |
3e7ee490 | 606 | |
011a7c3c S |
607 | bufferlist[0].iov_base = &desc; |
608 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
609 | bufferlist[1].iov_base = buffer; | |
610 | bufferlist[1].iov_len = bufferlen; | |
611 | bufferlist[2].iov_base = &aligned_data; | |
612 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 613 | |
98fa8cf4 | 614 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 615 | |
98fa8cf4 | 616 | if (ret == 0 && signal) |
fff41b2e | 617 | vmbus_setevent(channel); |
3e7ee490 | 618 | |
3e7ee490 HJ |
619 | return ret; |
620 | } | |
fff41b2e | 621 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 622 | |
3e189519 | 623 | /* |
fff41b2e | 624 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 625 | * packets using a GPADL Direct packet type. |
f4266e34 | 626 | */ |
fff41b2e | 627 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
628 | struct hv_page_buffer pagebuffers[], |
629 | u32 pagecount, void *buffer, u32 bufferlen, | |
630 | u64 requestid) | |
3e7ee490 | 631 | { |
f4266e34 GKH |
632 | int ret; |
633 | int i; | |
430a8e9a | 634 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
635 | u32 descsize; |
636 | u32 packetlen; | |
637 | u32 packetlen_aligned; | |
011a7c3c | 638 | struct kvec bufferlist[3]; |
39d70a4a | 639 | u64 aligned_data = 0; |
98fa8cf4 | 640 | bool signal = false; |
3e7ee490 | 641 | |
39d70a4a | 642 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 643 | return -EINVAL; |
3e7ee490 | 644 | |
3e7ee490 | 645 | |
f4266e34 | 646 | /* |
430a8e9a | 647 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
648 | * largest size we support |
649 | */ | |
39d70a4a HZ |
650 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
651 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 652 | sizeof(struct hv_page_buffer)); |
39d70a4a | 653 | packetlen = descsize + bufferlen; |
73509681 | 654 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 655 | |
454f18a9 | 656 | /* Setup the descriptor */ |
415f2287 | 657 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 658 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
659 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
660 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
661 | desc.transactionid = requestid; | |
662 | desc.rangecount = pagecount; | |
663 | ||
664 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
665 | desc.range[i].len = pagebuffers[i].len; |
666 | desc.range[i].offset = pagebuffers[i].offset; | |
667 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
668 | } |
669 | ||
011a7c3c S |
670 | bufferlist[0].iov_base = &desc; |
671 | bufferlist[0].iov_len = descsize; | |
672 | bufferlist[1].iov_base = buffer; | |
673 | bufferlist[1].iov_len = bufferlen; | |
674 | bufferlist[2].iov_base = &aligned_data; | |
675 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 676 | |
98fa8cf4 | 677 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 678 | |
98fa8cf4 | 679 | if (ret == 0 && signal) |
fff41b2e | 680 | vmbus_setevent(channel); |
3e7ee490 | 681 | |
3e7ee490 HJ |
682 | return ret; |
683 | } | |
713efeb4 | 684 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 685 | |
d61031ee S |
686 | /* |
687 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
688 | * using a GPADL Direct packet type. | |
689 | * The buffer includes the vmbus descriptor. | |
690 | */ | |
691 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
692 | struct vmbus_packet_mpb_array *desc, | |
693 | u32 desc_size, | |
694 | void *buffer, u32 bufferlen, u64 requestid) | |
695 | { | |
696 | int ret; | |
697 | u32 packetlen; | |
698 | u32 packetlen_aligned; | |
699 | struct kvec bufferlist[3]; | |
700 | u64 aligned_data = 0; | |
701 | bool signal = false; | |
702 | ||
703 | packetlen = desc_size + bufferlen; | |
704 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
705 | ||
706 | /* Setup the descriptor */ | |
707 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
708 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
709 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
710 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
711 | desc->transactionid = requestid; | |
712 | desc->rangecount = 1; | |
713 | ||
714 | bufferlist[0].iov_base = desc; | |
715 | bufferlist[0].iov_len = desc_size; | |
716 | bufferlist[1].iov_base = buffer; | |
717 | bufferlist[1].iov_len = bufferlen; | |
718 | bufferlist[2].iov_base = &aligned_data; | |
719 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
720 | ||
721 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
722 | ||
723 | if (ret == 0 && signal) | |
724 | vmbus_setevent(channel); | |
725 | ||
726 | return ret; | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
729 | ||
3e189519 | 730 | /* |
fff41b2e | 731 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 732 | * using a GPADL Direct packet type. |
f4266e34 | 733 | */ |
fff41b2e | 734 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
735 | struct hv_multipage_buffer *multi_pagebuffer, |
736 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 737 | { |
f4266e34 | 738 | int ret; |
430a8e9a | 739 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
740 | u32 descsize; |
741 | u32 packetlen; | |
742 | u32 packetlen_aligned; | |
011a7c3c | 743 | struct kvec bufferlist[3]; |
39d70a4a | 744 | u64 aligned_data = 0; |
98fa8cf4 | 745 | bool signal = false; |
ca623ad3 HZ |
746 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
747 | multi_pagebuffer->len); | |
3e7ee490 | 748 | |
24b8a406 | 749 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 750 | return -EINVAL; |
3e7ee490 | 751 | |
f4266e34 | 752 | /* |
430a8e9a | 753 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
754 | * the largest size we support |
755 | */ | |
39d70a4a HZ |
756 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
757 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 758 | sizeof(u64)); |
39d70a4a | 759 | packetlen = descsize + bufferlen; |
73509681 | 760 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 761 | |
3e7ee490 | 762 | |
454f18a9 | 763 | /* Setup the descriptor */ |
415f2287 | 764 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 765 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
766 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
767 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
768 | desc.transactionid = requestid; | |
430a8e9a | 769 | desc.rangecount = 1; |
3e7ee490 | 770 | |
ca623ad3 HZ |
771 | desc.range.len = multi_pagebuffer->len; |
772 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 773 | |
ca623ad3 | 774 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 775 | pfncount * sizeof(u64)); |
3e7ee490 | 776 | |
011a7c3c S |
777 | bufferlist[0].iov_base = &desc; |
778 | bufferlist[0].iov_len = descsize; | |
779 | bufferlist[1].iov_base = buffer; | |
780 | bufferlist[1].iov_len = bufferlen; | |
781 | bufferlist[2].iov_base = &aligned_data; | |
782 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 783 | |
98fa8cf4 | 784 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 785 | |
98fa8cf4 | 786 | if (ret == 0 && signal) |
fff41b2e | 787 | vmbus_setevent(channel); |
3e7ee490 | 788 | |
3e7ee490 HJ |
789 | return ret; |
790 | } | |
4cb106fa | 791 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
792 | |
793 | /** | |
fff41b2e | 794 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
795 | * @channel: Pointer to vmbus_channel structure. |
796 | * @buffer: Pointer to the buffer you want to receive the data into. | |
797 | * @bufferlen: Maximum size of what the the buffer will hold | |
798 | * @buffer_actual_len: The actual size of the data after it was received | |
799 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
800 | * |
801 | * Receives directly from the hyper-v vmbus and puts the data it received | |
802 | * into Buffer. This will receive the data unparsed from hyper-v. | |
803 | * | |
804 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 805 | */ |
fff41b2e | 806 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 807 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 808 | { |
8dc0a06a | 809 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
810 | u32 packetlen; |
811 | u32 userlen; | |
3e7ee490 | 812 | int ret; |
c2b8e520 | 813 | bool signal = false; |
3e7ee490 | 814 | |
39d70a4a HZ |
815 | *buffer_actual_len = 0; |
816 | *requestid = 0; | |
3e7ee490 | 817 | |
3e7ee490 | 818 | |
a89186c2 | 819 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 820 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 821 | if (ret != 0) |
3e7ee490 | 822 | return 0; |
3e7ee490 | 823 | |
415f2287 HZ |
824 | packetlen = desc.len8 << 3; |
825 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 826 | |
39d70a4a | 827 | *buffer_actual_len = userlen; |
3e7ee490 | 828 | |
39d70a4a | 829 | if (userlen > bufferlen) { |
3e7ee490 | 830 | |
0a46618d | 831 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 832 | bufferlen, userlen); |
926ae526 | 833 | return -ETOOSMALL; |
3e7ee490 HJ |
834 | } |
835 | ||
415f2287 | 836 | *requestid = desc.trans_id; |
3e7ee490 | 837 | |
454f18a9 | 838 | /* Copy over the packet to the user buffer */ |
38397c8a | 839 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 840 | (desc.offset8 << 3), &signal); |
3e7ee490 | 841 | |
c2b8e520 S |
842 | if (signal) |
843 | vmbus_setevent(channel); | |
3e7ee490 | 844 | |
3e7ee490 HJ |
845 | return 0; |
846 | } | |
fff41b2e | 847 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 848 | |
3e189519 | 849 | /* |
fff41b2e | 850 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 851 | */ |
fff41b2e | 852 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
853 | u32 bufferlen, u32 *buffer_actual_len, |
854 | u64 *requestid) | |
3e7ee490 | 855 | { |
8dc0a06a | 856 | struct vmpacket_descriptor desc; |
39d70a4a | 857 | u32 packetlen; |
3e7ee490 | 858 | int ret; |
c2b8e520 | 859 | bool signal = false; |
3e7ee490 | 860 | |
39d70a4a HZ |
861 | *buffer_actual_len = 0; |
862 | *requestid = 0; | |
3e7ee490 | 863 | |
3e7ee490 | 864 | |
a89186c2 | 865 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 866 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 867 | if (ret != 0) |
3e7ee490 | 868 | return 0; |
3e7ee490 | 869 | |
3e7ee490 | 870 | |
415f2287 | 871 | packetlen = desc.len8 << 3; |
3e7ee490 | 872 | |
39d70a4a | 873 | *buffer_actual_len = packetlen; |
3e7ee490 | 874 | |
7a446d63 | 875 | if (packetlen > bufferlen) |
3d5cad97 | 876 | return -ENOBUFS; |
3e7ee490 | 877 | |
415f2287 | 878 | *requestid = desc.trans_id; |
3e7ee490 | 879 | |
454f18a9 | 880 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
881 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
882 | &signal); | |
883 | ||
884 | if (signal) | |
885 | vmbus_setevent(channel); | |
3e7ee490 | 886 | |
33b06938 | 887 | return ret; |
3e7ee490 | 888 | } |
adaee6bd | 889 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |