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> |
3f335ea2 | 30 | |
0f2a6619 | 31 | #include "hyperv_vmbus.h" |
3e7ee490 | 32 | |
e3fe0bb6 S |
33 | #define NUM_PAGES_SPANNED(addr, len) \ |
34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
35 | ||
3e189519 | 36 | /* |
fff41b2e | 37 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 38 | * channel. |
f4266e34 | 39 | */ |
fff41b2e | 40 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 41 | { |
39d70a4a | 42 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 43 | |
c50f7fb2 | 44 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 45 | /* Each u32 represents 32 channels */ |
22356585 | 46 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 47 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 48 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 49 | |
da9fcb72 | 50 | monitorpage = vmbus_connection.monitor_pages; |
39d70a4a | 51 | monitorpage++; /* Get the child to parent monitor page */ |
3e7ee490 | 52 | |
22356585 | 53 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
54 | (unsigned long *)&monitorpage->trigger_group |
55 | [channel->monitor_grp].pending); | |
7c369f40 | 56 | |
f4266e34 | 57 | } else { |
21c3bef5 | 58 | vmbus_set_event(channel); |
3e7ee490 | 59 | } |
3e7ee490 HJ |
60 | } |
61 | ||
3e189519 | 62 | /* |
fff41b2e | 63 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 64 | */ |
fff41b2e | 65 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 66 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 67 | { |
39d70a4a | 68 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
69 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
70 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
3e7ee490 | 71 | |
da9fcb72 | 72 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 73 | |
c50f7fb2 | 74 | debuginfo->servermonitor_pending = |
f6feebe0 | 75 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 76 | debuginfo->servermonitor_latency = |
f6feebe0 | 77 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 78 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
79 | monitorpage->parameter[monitor_group] |
80 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 81 | |
39d70a4a | 82 | monitorpage++; |
3e7ee490 | 83 | |
c50f7fb2 | 84 | debuginfo->clientmonitor_pending = |
f6feebe0 | 85 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 86 | debuginfo->clientmonitor_latency = |
f6feebe0 | 87 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 88 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
89 | monitorpage->parameter[monitor_group] |
90 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 91 | |
a75b61d5 S |
92 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
93 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
94 | } |
95 | ||
3e189519 | 96 | /* |
fff41b2e | 97 | * vmbus_open - Open the specified channel. |
f4266e34 | 98 | */ |
fff41b2e | 99 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
100 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
101 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 102 | { |
0987ff69 | 103 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 104 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 105 | void *in, *out; |
dd0813b6 | 106 | unsigned long flags; |
9568a193 | 107 | int ret, t, err = 0; |
3e7ee490 | 108 | |
e68d2971 S |
109 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
110 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
111 | newchannel->state = CHANNEL_OPENING_STATE; | |
112 | } else { | |
113 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
114 | return -EINVAL; | |
115 | } | |
116 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
117 | ||
c50f7fb2 HZ |
118 | newchannel->onchannel_callback = onchannelcallback; |
119 | newchannel->channel_callback_context = context; | |
3e7ee490 | 120 | |
454f18a9 | 121 | /* Allocate the ring buffer */ |
df3493e0 S |
122 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
123 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
124 | ||
7e052d98 BP |
125 | if (!out) |
126 | return -ENOMEM; | |
127 | ||
3e7ee490 | 128 | |
39d70a4a | 129 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 130 | |
c50f7fb2 HZ |
131 | newchannel->ringbuffer_pages = out; |
132 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 133 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 134 | |
72a95cbc S |
135 | ret = hv_ringbuffer_init( |
136 | &newchannel->outbound, out, send_ringbuffer_size); | |
137 | ||
fd4dc88e | 138 | if (ret != 0) { |
3324fb40 | 139 | err = ret; |
13925502 | 140 | goto error0; |
3324fb40 BP |
141 | } |
142 | ||
72a95cbc S |
143 | ret = hv_ringbuffer_init( |
144 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 145 | if (ret != 0) { |
3324fb40 | 146 | err = ret; |
13925502 | 147 | goto error0; |
3324fb40 | 148 | } |
3e7ee490 | 149 | |
3e7ee490 | 150 | |
454f18a9 | 151 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 152 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 153 | |
fff41b2e | 154 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 155 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
156 | send_ringbuffer_size + |
157 | recv_ringbuffer_size, | |
c50f7fb2 | 158 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 159 | |
fd4dc88e | 160 | if (ret != 0) { |
b94ef345 | 161 | err = ret; |
13925502 | 162 | goto error0; |
b94ef345 | 163 | } |
f4266e34 | 164 | |
454f18a9 | 165 | /* Create and init the channel open message */ |
176fb9e3 | 166 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
167 | sizeof(struct vmbus_channel_open_channel), |
168 | GFP_KERNEL); | |
176fb9e3 | 169 | if (!open_info) { |
c3bf2e26 | 170 | err = -ENOMEM; |
13925502 | 171 | goto error0; |
c3bf2e26 | 172 | } |
3e7ee490 | 173 | |
176fb9e3 | 174 | init_completion(&open_info->waitevent); |
3e7ee490 | 175 | |
176fb9e3 | 176 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
177 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
178 | open_msg->openid = newchannel->offermsg.child_relid; | |
179 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
180 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
181 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 182 | PAGE_SHIFT; |
abbf3b2a | 183 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 184 | |
39d70a4a | 185 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 186 | err = -EINVAL; |
13925502 | 187 | goto error0; |
c827f944 BP |
188 | } |
189 | ||
39d70a4a | 190 | if (userdatalen) |
0987ff69 | 191 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 192 | |
15b2f647 | 193 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 194 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 195 | &vmbus_connection.chn_msg_list); |
15b2f647 | 196 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 197 | |
0987ff69 | 198 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 199 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
200 | |
201 | if (ret != 0) | |
13925502 | 202 | goto error1; |
3e7ee490 | 203 | |
176fb9e3 | 204 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 205 | if (t == 0) { |
0c3b7b2f | 206 | err = -ETIMEDOUT; |
13925502 | 207 | goto error1; |
0c3b7b2f S |
208 | } |
209 | ||
3e7ee490 | 210 | |
176fb9e3 S |
211 | if (open_info->response.open_result.status) |
212 | err = open_info->response.open_result.status; | |
3e7ee490 | 213 | |
15b2f647 | 214 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 215 | list_del(&open_info->msglistentry); |
15b2f647 | 216 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 217 | |
e68d2971 S |
218 | if (err == 0) |
219 | newchannel->state = CHANNEL_OPENED_STATE; | |
220 | ||
176fb9e3 | 221 | kfree(open_info); |
98e08702 | 222 | return err; |
c3bf2e26 | 223 | |
13925502 S |
224 | error1: |
225 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
226 | list_del(&open_info->msglistentry); | |
227 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
228 | ||
229 | error0: | |
df3493e0 S |
230 | free_pages((unsigned long)out, |
231 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 232 | kfree(open_info); |
c3bf2e26 | 233 | return err; |
3e7ee490 | 234 | } |
36ceadfc | 235 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 236 | |
3e189519 | 237 | /* |
fff41b2e | 238 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 239 | */ |
fff41b2e | 240 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
241 | struct vmbus_channel_msginfo **msginfo, |
242 | u32 *messagecount) | |
3e7ee490 HJ |
243 | { |
244 | int i; | |
39d70a4a | 245 | int pagecount; |
f4266e34 | 246 | unsigned long long pfn; |
39d70a4a HZ |
247 | struct vmbus_channel_gpadl_header *gpadl_header; |
248 | struct vmbus_channel_gpadl_body *gpadl_body; | |
249 | struct vmbus_channel_msginfo *msgheader; | |
250 | struct vmbus_channel_msginfo *msgbody = NULL; | |
251 | u32 msgsize; | |
3e7ee490 | 252 | |
39d70a4a | 253 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 254 | |
39d70a4a HZ |
255 | pagecount = size >> PAGE_SHIFT; |
256 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 257 | |
454f18a9 | 258 | /* do we need a gpadl body msg */ |
39d70a4a | 259 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
260 | sizeof(struct vmbus_channel_gpadl_header) - |
261 | sizeof(struct gpa_range); | |
39d70a4a | 262 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 263 | |
39d70a4a | 264 | if (pagecount > pfncount) { |
f4266e34 | 265 | /* we need a gpadl body */ |
454f18a9 | 266 | /* fill in the header */ |
39d70a4a | 267 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 268 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
269 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
270 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
271 | if (!msgheader) | |
d1c250bb | 272 | goto nomem; |
3e7ee490 | 273 | |
c50f7fb2 HZ |
274 | INIT_LIST_HEAD(&msgheader->submsglist); |
275 | msgheader->msgsize = msgsize; | |
3e7ee490 | 276 | |
39d70a4a | 277 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
278 | msgheader->msg; |
279 | gpadl_header->rangecount = 1; | |
280 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 281 | pagecount * sizeof(u64); |
415f2287 HZ |
282 | gpadl_header->range[0].byte_offset = 0; |
283 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 284 | for (i = 0; i < pfncount; i++) |
415f2287 | 285 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
286 | *msginfo = msgheader; |
287 | *messagecount = 1; | |
3e7ee490 | 288 | |
39d70a4a HZ |
289 | pfnsum = pfncount; |
290 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 291 | |
454f18a9 | 292 | /* how many pfns can we fit */ |
39d70a4a | 293 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 294 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 295 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 296 | |
454f18a9 | 297 | /* fill in the body */ |
39d70a4a HZ |
298 | while (pfnleft) { |
299 | if (pfnleft > pfncount) | |
300 | pfncurr = pfncount; | |
3e7ee490 | 301 | else |
39d70a4a | 302 | pfncurr = pfnleft; |
3e7ee490 | 303 | |
39d70a4a | 304 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 305 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
306 | pfncurr * sizeof(u64); |
307 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
308 | |
309 | if (!msgbody) { | |
310 | struct vmbus_channel_msginfo *pos = NULL; | |
311 | struct vmbus_channel_msginfo *tmp = NULL; | |
312 | /* | |
313 | * Free up all the allocated messages. | |
314 | */ | |
315 | list_for_each_entry_safe(pos, tmp, | |
316 | &msgheader->submsglist, | |
317 | msglistentry) { | |
318 | ||
319 | list_del(&pos->msglistentry); | |
320 | kfree(pos); | |
321 | } | |
322 | ||
d1c250bb | 323 | goto nomem; |
f38cf9cc S |
324 | } |
325 | ||
c50f7fb2 | 326 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
327 | (*messagecount)++; |
328 | gpadl_body = | |
c50f7fb2 | 329 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
330 | |
331 | /* | |
f4266e34 GKH |
332 | * Gpadl is u32 and we are using a pointer which could |
333 | * be 64-bit | |
f27df643 S |
334 | * This is governed by the guest/host protocol and |
335 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 336 | */ |
39d70a4a | 337 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 338 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 339 | |
454f18a9 | 340 | /* add to msg header */ |
c50f7fb2 HZ |
341 | list_add_tail(&msgbody->msglistentry, |
342 | &msgheader->submsglist); | |
39d70a4a HZ |
343 | pfnsum += pfncurr; |
344 | pfnleft -= pfncurr; | |
3e7ee490 | 345 | } |
f4266e34 | 346 | } else { |
454f18a9 | 347 | /* everything fits in a header */ |
39d70a4a | 348 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 349 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
350 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
351 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
352 | if (msgheader == NULL) | |
e3eb7cdd | 353 | goto nomem; |
c50f7fb2 | 354 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
355 | |
356 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
357 | msgheader->msg; |
358 | gpadl_header->rangecount = 1; | |
359 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 360 | pagecount * sizeof(u64); |
415f2287 HZ |
361 | gpadl_header->range[0].byte_offset = 0; |
362 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 363 | for (i = 0; i < pagecount; i++) |
415f2287 | 364 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
365 | |
366 | *msginfo = msgheader; | |
367 | *messagecount = 1; | |
3e7ee490 HJ |
368 | } |
369 | ||
370 | return 0; | |
d1c250bb | 371 | nomem: |
39d70a4a HZ |
372 | kfree(msgheader); |
373 | kfree(msgbody); | |
d1c250bb | 374 | return -ENOMEM; |
3e7ee490 HJ |
375 | } |
376 | ||
3e189519 | 377 | /* |
fff41b2e | 378 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 379 | * |
39d70a4a HZ |
380 | * @channel: a channel |
381 | * @kbuffer: from kmalloc | |
382 | * @size: page-size multiple | |
383 | * @gpadl_handle: some funky thing | |
f4266e34 | 384 | */ |
fff41b2e | 385 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 386 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 387 | { |
39d70a4a HZ |
388 | struct vmbus_channel_gpadl_header *gpadlmsg; |
389 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
390 | struct vmbus_channel_msginfo *msginfo = NULL; |
391 | struct vmbus_channel_msginfo *submsginfo; | |
392 | u32 msgcount; | |
53af545b | 393 | struct list_head *curr; |
39d70a4a | 394 | u32 next_gpadl_handle; |
dd0813b6 | 395 | unsigned long flags; |
c3bf2e26 | 396 | int ret = 0; |
9568a193 | 397 | int t; |
3e7ee490 | 398 | |
da9fcb72 HZ |
399 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
400 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 401 | |
fff41b2e | 402 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
403 | if (ret) |
404 | return ret; | |
3e7ee490 | 405 | |
9568a193 | 406 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 407 | |
c50f7fb2 HZ |
408 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
409 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
410 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
411 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 412 | |
3e7ee490 | 413 | |
15b2f647 | 414 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 415 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 416 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 417 | |
15b2f647 | 418 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 419 | |
c6977677 | 420 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 421 | sizeof(*msginfo)); |
98e08702 | 422 | if (ret != 0) |
00d760b0 | 423 | goto cleanup; |
3e7ee490 | 424 | |
39d70a4a | 425 | if (msgcount > 1) { |
c50f7fb2 | 426 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 427 | |
39d70a4a HZ |
428 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
429 | gpadl_body = | |
c50f7fb2 | 430 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 431 | |
c50f7fb2 HZ |
432 | gpadl_body->header.msgtype = |
433 | CHANNELMSG_GPADL_BODY; | |
434 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 435 | |
c6977677 | 436 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 437 | submsginfo->msgsize - |
39d70a4a | 438 | sizeof(*submsginfo)); |
fd4dc88e | 439 | if (ret != 0) |
00d760b0 | 440 | goto cleanup; |
99259159 | 441 | |
3e7ee490 HJ |
442 | } |
443 | } | |
40961de3 | 444 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 445 | BUG_ON(t == 0); |
0c3b7b2f | 446 | |
3e7ee490 | 447 | |
454f18a9 | 448 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 449 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 450 | |
00d760b0 | 451 | cleanup: |
15b2f647 | 452 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 453 | list_del(&msginfo->msglistentry); |
15b2f647 | 454 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 455 | |
39d70a4a | 456 | kfree(msginfo); |
3e7ee490 HJ |
457 | return ret; |
458 | } | |
98873724 | 459 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 460 | |
3e189519 | 461 | /* |
fff41b2e | 462 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 463 | */ |
fff41b2e | 464 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 465 | { |
82250213 | 466 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 467 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 468 | unsigned long flags; |
9568a193 | 469 | int ret, t; |
3e7ee490 | 470 | |
f4266e34 GKH |
471 | info = kmalloc(sizeof(*info) + |
472 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
473 | if (!info) |
474 | return -ENOMEM; | |
3e7ee490 | 475 | |
9568a193 | 476 | init_completion(&info->waitevent); |
3e7ee490 | 477 | |
c50f7fb2 | 478 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 479 | |
c50f7fb2 HZ |
480 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
481 | msg->child_relid = channel->offermsg.child_relid; | |
482 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 483 | |
15b2f647 | 484 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 485 | list_add_tail(&info->msglistentry, |
da9fcb72 | 486 | &vmbus_connection.chn_msg_list); |
15b2f647 | 487 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 488 | ret = vmbus_post_msg(msg, |
f4266e34 | 489 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 490 | |
0c3b7b2f | 491 | BUG_ON(ret != 0); |
40961de3 | 492 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 493 | BUG_ON(t == 0); |
3e7ee490 | 494 | |
454f18a9 | 495 | /* Received a torndown response */ |
15b2f647 | 496 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 497 | list_del(&info->msglistentry); |
15b2f647 | 498 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 499 | |
8c69f52a | 500 | kfree(info); |
3e7ee490 HJ |
501 | return ret; |
502 | } | |
18726d7a | 503 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 504 | |
e68d2971 | 505 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 506 | { |
82250213 | 507 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 508 | int ret; |
dad76bf7 | 509 | unsigned long flags; |
3e7ee490 | 510 | |
e68d2971 S |
511 | channel->state = CHANNEL_OPEN_STATE; |
512 | channel->sc_creation_callback = NULL; | |
454f18a9 | 513 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 514 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 515 | channel->onchannel_callback = NULL; |
dad76bf7 | 516 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 517 | |
454f18a9 | 518 | /* Send a closing message */ |
3e7ee490 | 519 | |
e9a27a9f | 520 | msg = &channel->close_msg.msg; |
3e7ee490 | 521 | |
c50f7fb2 HZ |
522 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
523 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 524 | |
c6977677 | 525 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 526 | |
0c3b7b2f | 527 | BUG_ON(ret != 0); |
454f18a9 | 528 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 529 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 530 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 531 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 532 | |
454f18a9 | 533 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
534 | hv_ringbuffer_cleanup(&channel->outbound); |
535 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 536 | |
df3493e0 S |
537 | free_pages((unsigned long)channel->ringbuffer_pages, |
538 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 539 | |
3e7ee490 | 540 | |
3e7ee490 | 541 | } |
e68d2971 S |
542 | |
543 | /* | |
544 | * vmbus_close - Close the specified channel | |
545 | */ | |
546 | void vmbus_close(struct vmbus_channel *channel) | |
547 | { | |
548 | struct list_head *cur, *tmp; | |
549 | struct vmbus_channel *cur_channel; | |
550 | ||
551 | if (channel->primary_channel != NULL) { | |
552 | /* | |
553 | * We will only close sub-channels when | |
554 | * the primary is closed. | |
555 | */ | |
556 | return; | |
557 | } | |
558 | /* | |
559 | * Close all the sub-channels first and then close the | |
560 | * primary channel. | |
561 | */ | |
562 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
563 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
564 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
565 | continue; | |
566 | vmbus_close_internal(cur_channel); | |
567 | } | |
568 | /* | |
569 | * Now close the primary. | |
570 | */ | |
571 | vmbus_close_internal(channel); | |
572 | } | |
70bfa307 | 573 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 574 | |
c88c4e4c | 575 | /** |
fff41b2e | 576 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
577 | * @channel: Pointer to vmbus_channel structure. |
578 | * @buffer: Pointer to the buffer you want to receive the data into. | |
579 | * @bufferlen: Maximum size of what the the buffer will hold | |
580 | * @requestid: Identifier of the request | |
581 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
582 | * packet etc. |
583 | * | |
39d70a4a | 584 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
585 | * This will send the data unparsed to hyper-v. |
586 | * | |
587 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 588 | */ |
fff41b2e | 589 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
590 | u32 bufferlen, u64 requestid, |
591 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 592 | { |
8dc0a06a | 593 | struct vmpacket_descriptor desc; |
39d70a4a | 594 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 595 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
596 | struct scatterlist bufferlist[3]; |
597 | u64 aligned_data = 0; | |
f4266e34 | 598 | int ret; |
98fa8cf4 | 599 | bool signal = false; |
3e7ee490 | 600 | |
3e7ee490 | 601 | |
454f18a9 | 602 | /* Setup the descriptor */ |
415f2287 HZ |
603 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
604 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 605 | /* in 8-bytes granularity */ |
415f2287 HZ |
606 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
607 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
608 | desc.trans_id = requestid; | |
3e7ee490 | 609 | |
39d70a4a HZ |
610 | sg_init_table(bufferlist, 3); |
611 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
612 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
613 | sg_set_buf(&bufferlist[2], &aligned_data, | |
614 | packetlen_aligned - packetlen); | |
3e7ee490 | 615 | |
98fa8cf4 | 616 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 617 | |
98fa8cf4 | 618 | if (ret == 0 && signal) |
fff41b2e | 619 | vmbus_setevent(channel); |
3e7ee490 | 620 | |
3e7ee490 HJ |
621 | return ret; |
622 | } | |
fff41b2e | 623 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 624 | |
3e189519 | 625 | /* |
fff41b2e | 626 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 627 | * packets using a GPADL Direct packet type. |
f4266e34 | 628 | */ |
fff41b2e | 629 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
630 | struct hv_page_buffer pagebuffers[], |
631 | u32 pagecount, void *buffer, u32 bufferlen, | |
632 | u64 requestid) | |
3e7ee490 | 633 | { |
f4266e34 GKH |
634 | int ret; |
635 | int i; | |
430a8e9a | 636 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
637 | u32 descsize; |
638 | u32 packetlen; | |
639 | u32 packetlen_aligned; | |
640 | struct scatterlist bufferlist[3]; | |
641 | u64 aligned_data = 0; | |
98fa8cf4 | 642 | bool signal = false; |
3e7ee490 | 643 | |
39d70a4a | 644 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 645 | return -EINVAL; |
3e7ee490 | 646 | |
3e7ee490 | 647 | |
f4266e34 | 648 | /* |
430a8e9a | 649 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
650 | * largest size we support |
651 | */ | |
39d70a4a HZ |
652 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
653 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 654 | sizeof(struct hv_page_buffer)); |
39d70a4a | 655 | packetlen = descsize + bufferlen; |
73509681 | 656 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 657 | |
454f18a9 | 658 | /* Setup the descriptor */ |
415f2287 | 659 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 660 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
661 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
662 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
663 | desc.transactionid = requestid; | |
664 | desc.rangecount = pagecount; | |
665 | ||
666 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
667 | desc.range[i].len = pagebuffers[i].len; |
668 | desc.range[i].offset = pagebuffers[i].offset; | |
669 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
670 | } |
671 | ||
39d70a4a HZ |
672 | sg_init_table(bufferlist, 3); |
673 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
674 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
675 | sg_set_buf(&bufferlist[2], &aligned_data, | |
676 | packetlen_aligned - packetlen); | |
3e7ee490 | 677 | |
98fa8cf4 | 678 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 679 | |
98fa8cf4 | 680 | if (ret == 0 && signal) |
fff41b2e | 681 | vmbus_setevent(channel); |
3e7ee490 | 682 | |
3e7ee490 HJ |
683 | return ret; |
684 | } | |
713efeb4 | 685 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 686 | |
3e189519 | 687 | /* |
fff41b2e | 688 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 689 | * using a GPADL Direct packet type. |
f4266e34 | 690 | */ |
fff41b2e | 691 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
692 | struct hv_multipage_buffer *multi_pagebuffer, |
693 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 694 | { |
f4266e34 | 695 | int ret; |
430a8e9a | 696 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
697 | u32 descsize; |
698 | u32 packetlen; | |
699 | u32 packetlen_aligned; | |
700 | struct scatterlist bufferlist[3]; | |
701 | u64 aligned_data = 0; | |
98fa8cf4 | 702 | bool signal = false; |
ca623ad3 HZ |
703 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
704 | multi_pagebuffer->len); | |
3e7ee490 | 705 | |
3e7ee490 | 706 | |
39d70a4a | 707 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 708 | return -EINVAL; |
3e7ee490 | 709 | |
f4266e34 | 710 | /* |
430a8e9a | 711 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
712 | * the largest size we support |
713 | */ | |
39d70a4a HZ |
714 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
715 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 716 | sizeof(u64)); |
39d70a4a | 717 | packetlen = descsize + bufferlen; |
73509681 | 718 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 719 | |
3e7ee490 | 720 | |
454f18a9 | 721 | /* Setup the descriptor */ |
415f2287 | 722 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 723 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
724 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
725 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
726 | desc.transactionid = requestid; | |
430a8e9a | 727 | desc.rangecount = 1; |
3e7ee490 | 728 | |
ca623ad3 HZ |
729 | desc.range.len = multi_pagebuffer->len; |
730 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 731 | |
ca623ad3 | 732 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 733 | pfncount * sizeof(u64)); |
3e7ee490 | 734 | |
39d70a4a HZ |
735 | sg_init_table(bufferlist, 3); |
736 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
737 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
738 | sg_set_buf(&bufferlist[2], &aligned_data, | |
739 | packetlen_aligned - packetlen); | |
3e7ee490 | 740 | |
98fa8cf4 | 741 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 742 | |
98fa8cf4 | 743 | if (ret == 0 && signal) |
fff41b2e | 744 | vmbus_setevent(channel); |
3e7ee490 | 745 | |
3e7ee490 HJ |
746 | return ret; |
747 | } | |
4cb106fa | 748 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
749 | |
750 | /** | |
fff41b2e | 751 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
752 | * @channel: Pointer to vmbus_channel structure. |
753 | * @buffer: Pointer to the buffer you want to receive the data into. | |
754 | * @bufferlen: Maximum size of what the the buffer will hold | |
755 | * @buffer_actual_len: The actual size of the data after it was received | |
756 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
757 | * |
758 | * Receives directly from the hyper-v vmbus and puts the data it received | |
759 | * into Buffer. This will receive the data unparsed from hyper-v. | |
760 | * | |
761 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 762 | */ |
fff41b2e | 763 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 764 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 765 | { |
8dc0a06a | 766 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
767 | u32 packetlen; |
768 | u32 userlen; | |
3e7ee490 | 769 | int ret; |
c2b8e520 | 770 | bool signal = false; |
3e7ee490 | 771 | |
39d70a4a HZ |
772 | *buffer_actual_len = 0; |
773 | *requestid = 0; | |
3e7ee490 | 774 | |
3e7ee490 | 775 | |
a89186c2 | 776 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 777 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 778 | if (ret != 0) |
3e7ee490 | 779 | return 0; |
3e7ee490 | 780 | |
415f2287 HZ |
781 | packetlen = desc.len8 << 3; |
782 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 783 | |
39d70a4a | 784 | *buffer_actual_len = userlen; |
3e7ee490 | 785 | |
39d70a4a | 786 | if (userlen > bufferlen) { |
3e7ee490 | 787 | |
0a46618d | 788 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 789 | bufferlen, userlen); |
926ae526 | 790 | return -ETOOSMALL; |
3e7ee490 HJ |
791 | } |
792 | ||
415f2287 | 793 | *requestid = desc.trans_id; |
3e7ee490 | 794 | |
454f18a9 | 795 | /* Copy over the packet to the user buffer */ |
38397c8a | 796 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 797 | (desc.offset8 << 3), &signal); |
3e7ee490 | 798 | |
c2b8e520 S |
799 | if (signal) |
800 | vmbus_setevent(channel); | |
3e7ee490 | 801 | |
3e7ee490 HJ |
802 | return 0; |
803 | } | |
fff41b2e | 804 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 805 | |
3e189519 | 806 | /* |
fff41b2e | 807 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 808 | */ |
fff41b2e | 809 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
810 | u32 bufferlen, u32 *buffer_actual_len, |
811 | u64 *requestid) | |
3e7ee490 | 812 | { |
8dc0a06a | 813 | struct vmpacket_descriptor desc; |
39d70a4a | 814 | u32 packetlen; |
3e7ee490 | 815 | int ret; |
c2b8e520 | 816 | bool signal = false; |
3e7ee490 | 817 | |
39d70a4a HZ |
818 | *buffer_actual_len = 0; |
819 | *requestid = 0; | |
3e7ee490 | 820 | |
3e7ee490 | 821 | |
a89186c2 | 822 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 823 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 824 | if (ret != 0) |
3e7ee490 | 825 | return 0; |
3e7ee490 | 826 | |
3e7ee490 | 827 | |
415f2287 | 828 | packetlen = desc.len8 << 3; |
3e7ee490 | 829 | |
39d70a4a | 830 | *buffer_actual_len = packetlen; |
3e7ee490 | 831 | |
39d70a4a | 832 | if (packetlen > bufferlen) { |
0a46618d HJ |
833 | pr_err("Buffer too small - needed %d bytes but " |
834 | "got space for only %d bytes\n", | |
835 | packetlen, bufferlen); | |
3d5cad97 | 836 | return -ENOBUFS; |
3e7ee490 HJ |
837 | } |
838 | ||
415f2287 | 839 | *requestid = desc.trans_id; |
3e7ee490 | 840 | |
454f18a9 | 841 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
842 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
843 | &signal); | |
844 | ||
845 | if (signal) | |
846 | vmbus_setevent(channel); | |
3e7ee490 | 847 | |
3e7ee490 HJ |
848 | return 0; |
849 | } | |
adaee6bd | 850 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |