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> |
3f335ea2 S |
29 | |
30 | #include "hyperv.h" | |
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 | ||
454f18a9 | 36 | /* Internal routines */ |
fff41b2e | 37 | static int create_gpadl_header( |
39d70a4a HZ |
38 | void *kbuffer, /* must be phys and virt contiguous */ |
39 | u32 size, /* page-size multiple */ | |
40 | struct vmbus_channel_msginfo **msginfo, | |
41 | u32 *messagecount); | |
fff41b2e | 42 | static void vmbus_setevent(struct vmbus_channel *channel); |
3e7ee490 | 43 | |
3e189519 | 44 | /* |
fff41b2e | 45 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 46 | * channel. |
f4266e34 | 47 | */ |
fff41b2e | 48 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 49 | { |
39d70a4a | 50 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 51 | |
c50f7fb2 | 52 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 53 | /* Each u32 represents 32 channels */ |
22356585 | 54 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 55 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 56 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 57 | |
da9fcb72 | 58 | monitorpage = vmbus_connection.monitor_pages; |
39d70a4a | 59 | monitorpage++; /* Get the child to parent monitor page */ |
3e7ee490 | 60 | |
22356585 | 61 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
62 | (unsigned long *)&monitorpage->trigger_group |
63 | [channel->monitor_grp].pending); | |
7c369f40 | 64 | |
f4266e34 | 65 | } else { |
c6977677 | 66 | vmbus_set_event(channel->offermsg.child_relid); |
3e7ee490 | 67 | } |
3e7ee490 HJ |
68 | } |
69 | ||
3e189519 | 70 | /* |
fff41b2e | 71 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 72 | */ |
fff41b2e | 73 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 74 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 75 | { |
39d70a4a | 76 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
77 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
78 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
454f18a9 | 79 | /* u32 monitorBit = 1 << monitorOffset; */ |
3e7ee490 | 80 | |
c50f7fb2 HZ |
81 | debuginfo->relid = channel->offermsg.child_relid; |
82 | debuginfo->state = channel->state; | |
83 | memcpy(&debuginfo->interfacetype, | |
358d2ee2 | 84 | &channel->offermsg.offer.if_type, sizeof(uuid_le)); |
c50f7fb2 | 85 | memcpy(&debuginfo->interface_instance, |
767dff68 | 86 | &channel->offermsg.offer.if_instance, |
358d2ee2 | 87 | sizeof(uuid_le)); |
3e7ee490 | 88 | |
da9fcb72 | 89 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 90 | |
c50f7fb2 | 91 | debuginfo->monitorid = channel->offermsg.monitorid; |
3e7ee490 | 92 | |
c50f7fb2 | 93 | debuginfo->servermonitor_pending = |
f6feebe0 | 94 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 95 | debuginfo->servermonitor_latency = |
f6feebe0 | 96 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 97 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
98 | monitorpage->parameter[monitor_group] |
99 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 100 | |
39d70a4a | 101 | monitorpage++; |
3e7ee490 | 102 | |
c50f7fb2 | 103 | debuginfo->clientmonitor_pending = |
f6feebe0 | 104 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 105 | debuginfo->clientmonitor_latency = |
f6feebe0 | 106 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 107 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
108 | monitorpage->parameter[monitor_group] |
109 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 110 | |
a75b61d5 S |
111 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
112 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
113 | } |
114 | ||
3e189519 | 115 | /* |
fff41b2e | 116 | * vmbus_open - Open the specified channel. |
f4266e34 | 117 | */ |
fff41b2e | 118 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
119 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
120 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 121 | { |
82250213 | 122 | struct vmbus_channel_open_channel *openMsg; |
b94ef345 | 123 | struct vmbus_channel_msginfo *openInfo = NULL; |
3e7ee490 | 124 | void *in, *out; |
dd0813b6 | 125 | unsigned long flags; |
9568a193 | 126 | int ret, t, err = 0; |
3e7ee490 | 127 | |
c50f7fb2 HZ |
128 | newchannel->onchannel_callback = onchannelcallback; |
129 | newchannel->channel_callback_context = context; | |
3e7ee490 | 130 | |
454f18a9 | 131 | /* Allocate the ring buffer */ |
df3493e0 S |
132 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
133 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
134 | ||
7e052d98 BP |
135 | if (!out) |
136 | return -ENOMEM; | |
137 | ||
3e7ee490 | 138 | |
39d70a4a | 139 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 140 | |
c50f7fb2 HZ |
141 | newchannel->ringbuffer_pages = out; |
142 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 143 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 144 | |
72a95cbc S |
145 | ret = hv_ringbuffer_init( |
146 | &newchannel->outbound, out, send_ringbuffer_size); | |
147 | ||
fd4dc88e | 148 | if (ret != 0) { |
3324fb40 BP |
149 | err = ret; |
150 | goto errorout; | |
151 | } | |
152 | ||
72a95cbc S |
153 | ret = hv_ringbuffer_init( |
154 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 155 | if (ret != 0) { |
3324fb40 BP |
156 | err = ret; |
157 | goto errorout; | |
158 | } | |
3e7ee490 | 159 | |
3e7ee490 | 160 | |
454f18a9 | 161 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 162 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 163 | |
fff41b2e | 164 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 165 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
166 | send_ringbuffer_size + |
167 | recv_ringbuffer_size, | |
c50f7fb2 | 168 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 169 | |
fd4dc88e | 170 | if (ret != 0) { |
b94ef345 BP |
171 | err = ret; |
172 | goto errorout; | |
173 | } | |
f4266e34 | 174 | |
454f18a9 | 175 | /* Create and init the channel open message */ |
f4266e34 GKH |
176 | openInfo = kmalloc(sizeof(*openInfo) + |
177 | sizeof(struct vmbus_channel_open_channel), | |
178 | GFP_KERNEL); | |
c3bf2e26 BP |
179 | if (!openInfo) { |
180 | err = -ENOMEM; | |
181 | goto errorout; | |
182 | } | |
3e7ee490 | 183 | |
9568a193 | 184 | init_completion(&openInfo->waitevent); |
3e7ee490 | 185 | |
c50f7fb2 HZ |
186 | openMsg = (struct vmbus_channel_open_channel *)openInfo->msg; |
187 | openMsg->header.msgtype = CHANNELMSG_OPENCHANNEL; | |
f27df643 | 188 | openMsg->openid = newchannel->offermsg.child_relid; |
c50f7fb2 HZ |
189 | openMsg->child_relid = newchannel->offermsg.child_relid; |
190 | openMsg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
191 | openMsg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 192 | PAGE_SHIFT; |
f27df643 | 193 | openMsg->server_contextarea_gpadlhandle = 0; |
3e7ee490 | 194 | |
39d70a4a | 195 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 BP |
196 | err = -EINVAL; |
197 | goto errorout; | |
198 | } | |
199 | ||
39d70a4a | 200 | if (userdatalen) |
c50f7fb2 | 201 | memcpy(openMsg->userdata, userdata, userdatalen); |
3e7ee490 | 202 | |
15b2f647 | 203 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 204 | list_add_tail(&openInfo->msglistentry, |
da9fcb72 | 205 | &vmbus_connection.chn_msg_list); |
15b2f647 | 206 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 207 | |
c6977677 | 208 | ret = vmbus_post_msg(openMsg, |
f4266e34 | 209 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
210 | |
211 | if (ret != 0) | |
00d760b0 | 212 | goto cleanup; |
3e7ee490 | 213 | |
2dfde964 | 214 | t = wait_for_completion_timeout(&openInfo->waitevent, 5*HZ); |
9568a193 | 215 | if (t == 0) { |
0c3b7b2f S |
216 | err = -ETIMEDOUT; |
217 | goto errorout; | |
218 | } | |
219 | ||
3e7ee490 | 220 | |
98e08702 HJ |
221 | if (openInfo->response.open_result.status) |
222 | err = openInfo->response.open_result.status; | |
3e7ee490 | 223 | |
00d760b0 | 224 | cleanup: |
15b2f647 | 225 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 226 | list_del(&openInfo->msglistentry); |
15b2f647 | 227 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 228 | |
8c69f52a | 229 | kfree(openInfo); |
98e08702 | 230 | return err; |
c3bf2e26 BP |
231 | |
232 | errorout: | |
2dba688b S |
233 | hv_ringbuffer_cleanup(&newchannel->outbound); |
234 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
df3493e0 S |
235 | free_pages((unsigned long)out, |
236 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
c3bf2e26 BP |
237 | kfree(openInfo); |
238 | return err; | |
3e7ee490 | 239 | } |
36ceadfc | 240 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 241 | |
3e189519 | 242 | /* |
fff41b2e | 243 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 244 | */ |
fff41b2e | 245 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
246 | struct vmbus_channel_msginfo **msginfo, |
247 | u32 *messagecount) | |
3e7ee490 HJ |
248 | { |
249 | int i; | |
39d70a4a | 250 | int pagecount; |
f4266e34 | 251 | unsigned long long pfn; |
39d70a4a HZ |
252 | struct vmbus_channel_gpadl_header *gpadl_header; |
253 | struct vmbus_channel_gpadl_body *gpadl_body; | |
254 | struct vmbus_channel_msginfo *msgheader; | |
255 | struct vmbus_channel_msginfo *msgbody = NULL; | |
256 | u32 msgsize; | |
3e7ee490 | 257 | |
39d70a4a | 258 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 259 | |
39d70a4a HZ |
260 | pagecount = size >> PAGE_SHIFT; |
261 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 262 | |
454f18a9 | 263 | /* do we need a gpadl body msg */ |
39d70a4a | 264 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
265 | sizeof(struct vmbus_channel_gpadl_header) - |
266 | sizeof(struct gpa_range); | |
39d70a4a | 267 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 268 | |
39d70a4a | 269 | if (pagecount > pfncount) { |
f4266e34 | 270 | /* we need a gpadl body */ |
454f18a9 | 271 | /* fill in the header */ |
39d70a4a | 272 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 273 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
274 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
275 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
276 | if (!msgheader) | |
d1c250bb | 277 | goto nomem; |
3e7ee490 | 278 | |
c50f7fb2 HZ |
279 | INIT_LIST_HEAD(&msgheader->submsglist); |
280 | msgheader->msgsize = msgsize; | |
3e7ee490 | 281 | |
39d70a4a | 282 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
283 | msgheader->msg; |
284 | gpadl_header->rangecount = 1; | |
285 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 286 | pagecount * sizeof(u64); |
415f2287 HZ |
287 | gpadl_header->range[0].byte_offset = 0; |
288 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 289 | for (i = 0; i < pfncount; i++) |
415f2287 | 290 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
291 | *msginfo = msgheader; |
292 | *messagecount = 1; | |
3e7ee490 | 293 | |
39d70a4a HZ |
294 | pfnsum = pfncount; |
295 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 296 | |
454f18a9 | 297 | /* how many pfns can we fit */ |
39d70a4a | 298 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 299 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 300 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 301 | |
454f18a9 | 302 | /* fill in the body */ |
39d70a4a HZ |
303 | while (pfnleft) { |
304 | if (pfnleft > pfncount) | |
305 | pfncurr = pfncount; | |
3e7ee490 | 306 | else |
39d70a4a | 307 | pfncurr = pfnleft; |
3e7ee490 | 308 | |
39d70a4a | 309 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 310 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
311 | pfncurr * sizeof(u64); |
312 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
313 | |
314 | if (!msgbody) { | |
315 | struct vmbus_channel_msginfo *pos = NULL; | |
316 | struct vmbus_channel_msginfo *tmp = NULL; | |
317 | /* | |
318 | * Free up all the allocated messages. | |
319 | */ | |
320 | list_for_each_entry_safe(pos, tmp, | |
321 | &msgheader->submsglist, | |
322 | msglistentry) { | |
323 | ||
324 | list_del(&pos->msglistentry); | |
325 | kfree(pos); | |
326 | } | |
327 | ||
d1c250bb | 328 | goto nomem; |
f38cf9cc S |
329 | } |
330 | ||
c50f7fb2 | 331 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
332 | (*messagecount)++; |
333 | gpadl_body = | |
c50f7fb2 | 334 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
335 | |
336 | /* | |
f4266e34 GKH |
337 | * Gpadl is u32 and we are using a pointer which could |
338 | * be 64-bit | |
f27df643 S |
339 | * This is governed by the guest/host protocol and |
340 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 341 | */ |
39d70a4a | 342 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 343 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 344 | |
454f18a9 | 345 | /* add to msg header */ |
c50f7fb2 HZ |
346 | list_add_tail(&msgbody->msglistentry, |
347 | &msgheader->submsglist); | |
39d70a4a HZ |
348 | pfnsum += pfncurr; |
349 | pfnleft -= pfncurr; | |
3e7ee490 | 350 | } |
f4266e34 | 351 | } else { |
454f18a9 | 352 | /* everything fits in a header */ |
39d70a4a | 353 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 354 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
355 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
356 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
357 | if (msgheader == NULL) | |
e3eb7cdd | 358 | goto nomem; |
c50f7fb2 | 359 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
360 | |
361 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
362 | msgheader->msg; |
363 | gpadl_header->rangecount = 1; | |
364 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 365 | pagecount * sizeof(u64); |
415f2287 HZ |
366 | gpadl_header->range[0].byte_offset = 0; |
367 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 368 | for (i = 0; i < pagecount; i++) |
415f2287 | 369 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
370 | |
371 | *msginfo = msgheader; | |
372 | *messagecount = 1; | |
3e7ee490 HJ |
373 | } |
374 | ||
375 | return 0; | |
d1c250bb | 376 | nomem: |
39d70a4a HZ |
377 | kfree(msgheader); |
378 | kfree(msgbody); | |
d1c250bb | 379 | return -ENOMEM; |
3e7ee490 HJ |
380 | } |
381 | ||
3e189519 | 382 | /* |
fff41b2e | 383 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 384 | * |
39d70a4a HZ |
385 | * @channel: a channel |
386 | * @kbuffer: from kmalloc | |
387 | * @size: page-size multiple | |
388 | * @gpadl_handle: some funky thing | |
f4266e34 | 389 | */ |
fff41b2e | 390 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 391 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 392 | { |
39d70a4a HZ |
393 | struct vmbus_channel_gpadl_header *gpadlmsg; |
394 | struct vmbus_channel_gpadl_body *gpadl_body; | |
82250213 | 395 | /* struct vmbus_channel_gpadl_created *gpadlCreated; */ |
39d70a4a HZ |
396 | struct vmbus_channel_msginfo *msginfo = NULL; |
397 | struct vmbus_channel_msginfo *submsginfo; | |
398 | u32 msgcount; | |
53af545b | 399 | struct list_head *curr; |
39d70a4a | 400 | u32 next_gpadl_handle; |
dd0813b6 | 401 | unsigned long flags; |
c3bf2e26 | 402 | int ret = 0; |
9568a193 | 403 | int t; |
3e7ee490 | 404 | |
da9fcb72 HZ |
405 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
406 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 407 | |
fff41b2e | 408 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
409 | if (ret) |
410 | return ret; | |
3e7ee490 | 411 | |
9568a193 | 412 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 413 | |
c50f7fb2 HZ |
414 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
415 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
416 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
417 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 418 | |
3e7ee490 | 419 | |
15b2f647 | 420 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 421 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 422 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 423 | |
15b2f647 | 424 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 425 | |
c6977677 | 426 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 427 | sizeof(*msginfo)); |
98e08702 | 428 | if (ret != 0) |
00d760b0 | 429 | goto cleanup; |
3e7ee490 | 430 | |
39d70a4a | 431 | if (msgcount > 1) { |
c50f7fb2 | 432 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 433 | |
39d70a4a HZ |
434 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
435 | gpadl_body = | |
c50f7fb2 | 436 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 437 | |
c50f7fb2 HZ |
438 | gpadl_body->header.msgtype = |
439 | CHANNELMSG_GPADL_BODY; | |
440 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 441 | |
c6977677 | 442 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 443 | submsginfo->msgsize - |
39d70a4a | 444 | sizeof(*submsginfo)); |
fd4dc88e | 445 | if (ret != 0) |
00d760b0 | 446 | goto cleanup; |
99259159 | 447 | |
3e7ee490 HJ |
448 | } |
449 | } | |
40961de3 | 450 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 451 | BUG_ON(t == 0); |
0c3b7b2f | 452 | |
3e7ee490 | 453 | |
454f18a9 | 454 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 455 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 456 | |
00d760b0 | 457 | cleanup: |
15b2f647 | 458 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 459 | list_del(&msginfo->msglistentry); |
15b2f647 | 460 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 461 | |
39d70a4a | 462 | kfree(msginfo); |
3e7ee490 HJ |
463 | return ret; |
464 | } | |
98873724 | 465 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 466 | |
3e189519 | 467 | /* |
fff41b2e | 468 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 469 | */ |
fff41b2e | 470 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 471 | { |
82250213 | 472 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 473 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 474 | unsigned long flags; |
9568a193 | 475 | int ret, t; |
3e7ee490 | 476 | |
39d70a4a | 477 | /* ASSERT(gpadl_handle != 0); */ |
3e7ee490 | 478 | |
f4266e34 GKH |
479 | info = kmalloc(sizeof(*info) + |
480 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
481 | if (!info) |
482 | return -ENOMEM; | |
3e7ee490 | 483 | |
9568a193 | 484 | init_completion(&info->waitevent); |
3e7ee490 | 485 | |
c50f7fb2 | 486 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 487 | |
c50f7fb2 HZ |
488 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
489 | msg->child_relid = channel->offermsg.child_relid; | |
490 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 491 | |
15b2f647 | 492 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 493 | list_add_tail(&info->msglistentry, |
da9fcb72 | 494 | &vmbus_connection.chn_msg_list); |
15b2f647 | 495 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 496 | ret = vmbus_post_msg(msg, |
f4266e34 | 497 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 498 | |
0c3b7b2f | 499 | BUG_ON(ret != 0); |
40961de3 | 500 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 501 | BUG_ON(t == 0); |
3e7ee490 | 502 | |
454f18a9 | 503 | /* Received a torndown response */ |
15b2f647 | 504 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 505 | list_del(&info->msglistentry); |
15b2f647 | 506 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 507 | |
8c69f52a | 508 | kfree(info); |
3e7ee490 HJ |
509 | return ret; |
510 | } | |
18726d7a | 511 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 512 | |
3e189519 | 513 | /* |
fff41b2e | 514 | * vmbus_close - Close the specified channel |
f4266e34 | 515 | */ |
fff41b2e | 516 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 517 | { |
82250213 | 518 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 519 | int ret; |
3e7ee490 | 520 | |
454f18a9 | 521 | /* Stop callback and cancel the timer asap */ |
c50f7fb2 | 522 | channel->onchannel_callback = NULL; |
3e7ee490 | 523 | |
454f18a9 | 524 | /* Send a closing message */ |
3e7ee490 | 525 | |
e9a27a9f | 526 | msg = &channel->close_msg.msg; |
3e7ee490 | 527 | |
c50f7fb2 HZ |
528 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
529 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 530 | |
c6977677 | 531 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 532 | |
0c3b7b2f | 533 | BUG_ON(ret != 0); |
454f18a9 | 534 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 535 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 536 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 537 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 538 | |
454f18a9 | 539 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
540 | hv_ringbuffer_cleanup(&channel->outbound); |
541 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 542 | |
df3493e0 S |
543 | free_pages((unsigned long)channel->ringbuffer_pages, |
544 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 545 | |
3e7ee490 | 546 | |
3e7ee490 | 547 | } |
70bfa307 | 548 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 549 | |
c88c4e4c | 550 | /** |
fff41b2e | 551 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
552 | * @channel: Pointer to vmbus_channel structure. |
553 | * @buffer: Pointer to the buffer you want to receive the data into. | |
554 | * @bufferlen: Maximum size of what the the buffer will hold | |
555 | * @requestid: Identifier of the request | |
556 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
557 | * packet etc. |
558 | * | |
39d70a4a | 559 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
560 | * This will send the data unparsed to hyper-v. |
561 | * | |
562 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 563 | */ |
fff41b2e | 564 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
565 | u32 bufferlen, u64 requestid, |
566 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 567 | { |
8dc0a06a | 568 | struct vmpacket_descriptor desc; |
39d70a4a | 569 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 570 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
571 | struct scatterlist bufferlist[3]; |
572 | u64 aligned_data = 0; | |
f4266e34 | 573 | int ret; |
3e7ee490 | 574 | |
3e7ee490 | 575 | |
454f18a9 | 576 | /* Setup the descriptor */ |
415f2287 HZ |
577 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
578 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 579 | /* in 8-bytes granularity */ |
415f2287 HZ |
580 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
581 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
582 | desc.trans_id = requestid; | |
3e7ee490 | 583 | |
39d70a4a HZ |
584 | sg_init_table(bufferlist, 3); |
585 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
586 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
587 | sg_set_buf(&bufferlist[2], &aligned_data, | |
588 | packetlen_aligned - packetlen); | |
3e7ee490 | 589 | |
633c4dce | 590 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 591 | |
decc49da | 592 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 593 | vmbus_setevent(channel); |
3e7ee490 | 594 | |
3e7ee490 HJ |
595 | return ret; |
596 | } | |
fff41b2e | 597 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 598 | |
3e189519 | 599 | /* |
fff41b2e | 600 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 601 | * packets using a GPADL Direct packet type. |
f4266e34 | 602 | */ |
fff41b2e | 603 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
604 | struct hv_page_buffer pagebuffers[], |
605 | u32 pagecount, void *buffer, u32 bufferlen, | |
606 | u64 requestid) | |
3e7ee490 | 607 | { |
f4266e34 GKH |
608 | int ret; |
609 | int i; | |
430a8e9a | 610 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
611 | u32 descsize; |
612 | u32 packetlen; | |
613 | u32 packetlen_aligned; | |
614 | struct scatterlist bufferlist[3]; | |
615 | u64 aligned_data = 0; | |
3e7ee490 | 616 | |
39d70a4a | 617 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 618 | return -EINVAL; |
3e7ee490 | 619 | |
3e7ee490 | 620 | |
f4266e34 | 621 | /* |
430a8e9a | 622 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
623 | * largest size we support |
624 | */ | |
39d70a4a HZ |
625 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
626 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 627 | sizeof(struct hv_page_buffer)); |
39d70a4a | 628 | packetlen = descsize + bufferlen; |
73509681 | 629 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 630 | |
454f18a9 | 631 | /* Setup the descriptor */ |
415f2287 | 632 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 633 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
634 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
635 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
636 | desc.transactionid = requestid; | |
637 | desc.rangecount = pagecount; | |
638 | ||
639 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
640 | desc.range[i].len = pagebuffers[i].len; |
641 | desc.range[i].offset = pagebuffers[i].offset; | |
642 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
643 | } |
644 | ||
39d70a4a HZ |
645 | sg_init_table(bufferlist, 3); |
646 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
647 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
648 | sg_set_buf(&bufferlist[2], &aligned_data, | |
649 | packetlen_aligned - packetlen); | |
3e7ee490 | 650 | |
633c4dce | 651 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 652 | |
decc49da | 653 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 654 | vmbus_setevent(channel); |
3e7ee490 | 655 | |
3e7ee490 HJ |
656 | return ret; |
657 | } | |
713efeb4 | 658 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 659 | |
3e189519 | 660 | /* |
fff41b2e | 661 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 662 | * using a GPADL Direct packet type. |
f4266e34 | 663 | */ |
fff41b2e | 664 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
665 | struct hv_multipage_buffer *multi_pagebuffer, |
666 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 667 | { |
f4266e34 | 668 | int ret; |
430a8e9a | 669 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
670 | u32 descsize; |
671 | u32 packetlen; | |
672 | u32 packetlen_aligned; | |
673 | struct scatterlist bufferlist[3]; | |
674 | u64 aligned_data = 0; | |
ca623ad3 HZ |
675 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
676 | multi_pagebuffer->len); | |
3e7ee490 | 677 | |
3e7ee490 | 678 | |
39d70a4a | 679 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 680 | return -EINVAL; |
3e7ee490 | 681 | |
f4266e34 | 682 | /* |
430a8e9a | 683 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
684 | * the largest size we support |
685 | */ | |
39d70a4a HZ |
686 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
687 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 688 | sizeof(u64)); |
39d70a4a | 689 | packetlen = descsize + bufferlen; |
73509681 | 690 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 691 | |
3e7ee490 | 692 | |
454f18a9 | 693 | /* Setup the descriptor */ |
415f2287 | 694 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 695 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
696 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
697 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
698 | desc.transactionid = requestid; | |
430a8e9a | 699 | desc.rangecount = 1; |
3e7ee490 | 700 | |
ca623ad3 HZ |
701 | desc.range.len = multi_pagebuffer->len; |
702 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 703 | |
ca623ad3 | 704 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 705 | pfncount * sizeof(u64)); |
3e7ee490 | 706 | |
39d70a4a HZ |
707 | sg_init_table(bufferlist, 3); |
708 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
709 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
710 | sg_set_buf(&bufferlist[2], &aligned_data, | |
711 | packetlen_aligned - packetlen); | |
3e7ee490 | 712 | |
633c4dce | 713 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 714 | |
decc49da | 715 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 716 | vmbus_setevent(channel); |
3e7ee490 | 717 | |
3e7ee490 HJ |
718 | return ret; |
719 | } | |
4cb106fa | 720 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
721 | |
722 | /** | |
fff41b2e | 723 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
724 | * @channel: Pointer to vmbus_channel structure. |
725 | * @buffer: Pointer to the buffer you want to receive the data into. | |
726 | * @bufferlen: Maximum size of what the the buffer will hold | |
727 | * @buffer_actual_len: The actual size of the data after it was received | |
728 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
729 | * |
730 | * Receives directly from the hyper-v vmbus and puts the data it received | |
731 | * into Buffer. This will receive the data unparsed from hyper-v. | |
732 | * | |
733 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 734 | */ |
fff41b2e | 735 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 736 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 737 | { |
8dc0a06a | 738 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
739 | u32 packetlen; |
740 | u32 userlen; | |
3e7ee490 | 741 | int ret; |
54411c42 | 742 | unsigned long flags; |
3e7ee490 | 743 | |
39d70a4a HZ |
744 | *buffer_actual_len = 0; |
745 | *requestid = 0; | |
3e7ee490 | 746 | |
39d70a4a | 747 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 748 | |
a89186c2 | 749 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
750 | sizeof(struct vmpacket_descriptor)); |
751 | if (ret != 0) { | |
39d70a4a | 752 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
753 | return 0; |
754 | } | |
755 | ||
415f2287 HZ |
756 | packetlen = desc.len8 << 3; |
757 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 758 | |
39d70a4a | 759 | *buffer_actual_len = userlen; |
3e7ee490 | 760 | |
39d70a4a HZ |
761 | if (userlen > bufferlen) { |
762 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 763 | |
0a46618d | 764 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 765 | bufferlen, userlen); |
926ae526 | 766 | return -ETOOSMALL; |
3e7ee490 HJ |
767 | } |
768 | ||
415f2287 | 769 | *requestid = desc.trans_id; |
3e7ee490 | 770 | |
454f18a9 | 771 | /* Copy over the packet to the user buffer */ |
38397c8a | 772 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 773 | (desc.offset8 << 3)); |
3e7ee490 | 774 | |
39d70a4a | 775 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 776 | |
3e7ee490 HJ |
777 | return 0; |
778 | } | |
fff41b2e | 779 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 780 | |
3e189519 | 781 | /* |
fff41b2e | 782 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 783 | */ |
fff41b2e | 784 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
785 | u32 bufferlen, u32 *buffer_actual_len, |
786 | u64 *requestid) | |
3e7ee490 | 787 | { |
8dc0a06a | 788 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
789 | u32 packetlen; |
790 | u32 userlen; | |
3e7ee490 | 791 | int ret; |
54411c42 | 792 | unsigned long flags; |
3e7ee490 | 793 | |
39d70a4a HZ |
794 | *buffer_actual_len = 0; |
795 | *requestid = 0; | |
3e7ee490 | 796 | |
39d70a4a | 797 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 798 | |
a89186c2 | 799 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
800 | sizeof(struct vmpacket_descriptor)); |
801 | if (ret != 0) { | |
39d70a4a | 802 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
803 | return 0; |
804 | } | |
805 | ||
3e7ee490 | 806 | |
415f2287 HZ |
807 | packetlen = desc.len8 << 3; |
808 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 809 | |
39d70a4a | 810 | *buffer_actual_len = packetlen; |
3e7ee490 | 811 | |
39d70a4a HZ |
812 | if (packetlen > bufferlen) { |
813 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 814 | |
0a46618d HJ |
815 | pr_err("Buffer too small - needed %d bytes but " |
816 | "got space for only %d bytes\n", | |
817 | packetlen, bufferlen); | |
3e7ee490 HJ |
818 | return -2; |
819 | } | |
820 | ||
415f2287 | 821 | *requestid = desc.trans_id; |
3e7ee490 | 822 | |
454f18a9 | 823 | /* Copy over the entire packet to the user buffer */ |
38397c8a | 824 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 825 | |
39d70a4a | 826 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
827 | return 0; |
828 | } | |
adaee6bd | 829 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |