Commit | Line | Data |
---|---|---|
fceaf24a | 1 | /* |
fceaf24a 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: | |
d0e94d17 | 18 | * Haiyang Zhang <haiyangz@microsoft.com> |
fceaf24a | 19 | * Hank Janssen <hjanssen@microsoft.com> |
fceaf24a | 20 | */ |
5654e932 | 21 | #include <linux/kernel.h> |
0c3b7b2f S |
22 | #include <linux/sched.h> |
23 | #include <linux/wait.h> | |
0ffa63b0 | 24 | #include <linux/mm.h> |
b4362c9c | 25 | #include <linux/delay.h> |
21a80820 | 26 | #include <linux/io.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
e3fe0bb6 | 28 | #include "hv_api.h" |
645954c5 | 29 | #include "logging.h" |
af167ae9 | 30 | #include "netvsc.h" |
043efcc3 | 31 | #include "rndis_filter.h" |
314bf1d1 | 32 | #include "channel.h" |
fceaf24a HJ |
33 | |
34 | ||
454f18a9 | 35 | /* Globals */ |
85799a37 | 36 | static const char *driver_name = "netvsc"; |
fceaf24a | 37 | |
454f18a9 | 38 | /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */ |
85799a37 | 39 | static const struct hv_guid netvsc_device_type = { |
caf26a31 GKH |
40 | .data = { |
41 | 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, | |
42 | 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E | |
43 | } | |
fceaf24a HJ |
44 | }; |
45 | ||
5a71ae30 | 46 | static int netvsc_device_add(struct hv_device *device, void *additional_info); |
21a80820 | 47 | |
5a71ae30 | 48 | static int netvsc_device_remove(struct hv_device *device); |
21a80820 | 49 | |
5a71ae30 | 50 | static void netvsc_cleanup(struct hv_driver *driver); |
21a80820 | 51 | |
5a71ae30 | 52 | static void netvsc_channel_cb(void *context); |
21a80820 | 53 | |
5a71ae30 | 54 | static int netvsc_init_send_buf(struct hv_device *device); |
21a80820 | 55 | |
5a71ae30 | 56 | static int netvsc_init_recv_buf(struct hv_device *device); |
21a80820 | 57 | |
5a71ae30 | 58 | static int netvsc_destroy_send_buf(struct netvsc_device *net_device); |
21a80820 | 59 | |
5a71ae30 | 60 | static int netvsc_destroy_recv_buf(struct netvsc_device *net_device); |
21a80820 | 61 | |
5a71ae30 | 62 | static int netvsc_connect_vsp(struct hv_device *device); |
21a80820 | 63 | |
5a71ae30 | 64 | static void netvsc_send_completion(struct hv_device *device, |
85799a37 | 65 | struct vmpacket_descriptor *packet); |
21a80820 | 66 | |
5a71ae30 | 67 | static int netvsc_send(struct hv_device *device, |
85799a37 | 68 | struct hv_netvsc_packet *packet); |
21a80820 | 69 | |
5a71ae30 | 70 | static void netvsc_receive(struct hv_device *device, |
85799a37 | 71 | struct vmpacket_descriptor *packet); |
21a80820 | 72 | |
5a71ae30 | 73 | static void netvsc_receive_completion(void *context); |
21a80820 | 74 | |
5a71ae30 | 75 | static void netvsc_send_recv_completion(struct hv_device *device, |
85799a37 | 76 | u64 transaction_id); |
21a80820 | 77 | |
fceaf24a | 78 | |
5a71ae30 | 79 | static struct netvsc_device *alloc_net_device(struct hv_device *device) |
fceaf24a | 80 | { |
85799a37 | 81 | struct netvsc_device *net_device; |
fceaf24a | 82 | |
85799a37 HZ |
83 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
84 | if (!net_device) | |
fceaf24a HJ |
85 | return NULL; |
86 | ||
454f18a9 | 87 | /* Set to 2 to allow both inbound and outbound traffic */ |
53d21fdb | 88 | atomic_cmpxchg(&net_device->refcnt, 0, 2); |
fceaf24a | 89 | |
53d21fdb | 90 | net_device->dev = device; |
ca623ad3 | 91 | device->ext = net_device; |
fceaf24a | 92 | |
85799a37 | 93 | return net_device; |
fceaf24a HJ |
94 | } |
95 | ||
5a71ae30 | 96 | static void free_net_device(struct netvsc_device *device) |
fceaf24a | 97 | { |
31acaa50 | 98 | WARN_ON(atomic_read(&device->refcnt) != 0); |
ca623ad3 | 99 | device->dev->ext = NULL; |
85799a37 | 100 | kfree(device); |
fceaf24a HJ |
101 | } |
102 | ||
103 | ||
454f18a9 | 104 | /* Get the net device object iff exists and its refcount > 1 */ |
5a71ae30 | 105 | static struct netvsc_device *get_outbound_net_device(struct hv_device *device) |
fceaf24a | 106 | { |
85799a37 | 107 | struct netvsc_device *net_device; |
fceaf24a | 108 | |
ca623ad3 | 109 | net_device = device->ext; |
53d21fdb HZ |
110 | if (net_device && atomic_read(&net_device->refcnt) > 1) |
111 | atomic_inc(&net_device->refcnt); | |
fceaf24a | 112 | else |
85799a37 | 113 | net_device = NULL; |
fceaf24a | 114 | |
85799a37 | 115 | return net_device; |
fceaf24a HJ |
116 | } |
117 | ||
454f18a9 | 118 | /* Get the net device object iff exists and its refcount > 0 */ |
5a71ae30 | 119 | static struct netvsc_device *get_inbound_net_device(struct hv_device *device) |
fceaf24a | 120 | { |
85799a37 | 121 | struct netvsc_device *net_device; |
fceaf24a | 122 | |
ca623ad3 | 123 | net_device = device->ext; |
53d21fdb HZ |
124 | if (net_device && atomic_read(&net_device->refcnt)) |
125 | atomic_inc(&net_device->refcnt); | |
fceaf24a | 126 | else |
85799a37 | 127 | net_device = NULL; |
fceaf24a | 128 | |
85799a37 | 129 | return net_device; |
fceaf24a HJ |
130 | } |
131 | ||
5a71ae30 | 132 | static void put_net_device(struct hv_device *device) |
fceaf24a | 133 | { |
85799a37 | 134 | struct netvsc_device *net_device; |
fceaf24a | 135 | |
ca623ad3 | 136 | net_device = device->ext; |
fceaf24a | 137 | |
53d21fdb | 138 | atomic_dec(&net_device->refcnt); |
fceaf24a HJ |
139 | } |
140 | ||
5a71ae30 HZ |
141 | static struct netvsc_device *release_outbound_net_device( |
142 | struct hv_device *device) | |
fceaf24a | 143 | { |
85799a37 | 144 | struct netvsc_device *net_device; |
fceaf24a | 145 | |
ca623ad3 | 146 | net_device = device->ext; |
85799a37 | 147 | if (net_device == NULL) |
fceaf24a HJ |
148 | return NULL; |
149 | ||
454f18a9 | 150 | /* Busy wait until the ref drop to 2, then set it to 1 */ |
53d21fdb | 151 | while (atomic_cmpxchg(&net_device->refcnt, 2, 1) != 2) |
b4362c9c | 152 | udelay(100); |
fceaf24a | 153 | |
85799a37 | 154 | return net_device; |
fceaf24a HJ |
155 | } |
156 | ||
5a71ae30 HZ |
157 | static struct netvsc_device *release_inbound_net_device( |
158 | struct hv_device *device) | |
fceaf24a | 159 | { |
85799a37 | 160 | struct netvsc_device *net_device; |
fceaf24a | 161 | |
ca623ad3 | 162 | net_device = device->ext; |
85799a37 | 163 | if (net_device == NULL) |
fceaf24a HJ |
164 | return NULL; |
165 | ||
454f18a9 | 166 | /* Busy wait until the ref drop to 1, then set it to 0 */ |
53d21fdb | 167 | while (atomic_cmpxchg(&net_device->refcnt, 1, 0) != 1) |
b4362c9c | 168 | udelay(100); |
fceaf24a | 169 | |
ca623ad3 | 170 | device->ext = NULL; |
85799a37 | 171 | return net_device; |
fceaf24a HJ |
172 | } |
173 | ||
3e189519 | 174 | /* |
5a71ae30 | 175 | * netvsc_initialize - Main entry point |
21a80820 | 176 | */ |
5a71ae30 | 177 | int netvsc_initialize(struct hv_driver *drv) |
fceaf24a | 178 | { |
7e23a6e9 | 179 | struct netvsc_driver *driver = (struct netvsc_driver *)drv; |
fceaf24a | 180 | |
21a80820 GKH |
181 | DPRINT_DBG(NETVSC, "sizeof(struct hv_netvsc_packet)=%zd, " |
182 | "sizeof(struct nvsp_message)=%zd, " | |
183 | "sizeof(struct vmtransfer_page_packet_header)=%zd", | |
184 | sizeof(struct hv_netvsc_packet), | |
185 | sizeof(struct nvsp_message), | |
186 | sizeof(struct vmtransfer_page_packet_header)); | |
fceaf24a | 187 | |
85799a37 | 188 | drv->name = driver_name; |
ca623ad3 | 189 | memcpy(&drv->dev_type, &netvsc_device_type, sizeof(struct hv_guid)); |
fceaf24a | 190 | |
454f18a9 | 191 | /* Setup the dispatch table */ |
ca623ad3 HZ |
192 | driver->base.dev_add = netvsc_device_add; |
193 | driver->base.dev_rm = netvsc_device_remove; | |
194 | driver->base.cleanup = netvsc_cleanup; | |
fceaf24a | 195 | |
72a2f5bd | 196 | driver->send = netvsc_send; |
fceaf24a | 197 | |
9c26aa0d | 198 | rndis_filter_init(driver); |
21a80820 | 199 | return 0; |
fceaf24a HJ |
200 | } |
201 | ||
5a71ae30 | 202 | static int netvsc_init_recv_buf(struct hv_device *device) |
fceaf24a | 203 | { |
21a80820 | 204 | int ret = 0; |
85799a37 HZ |
205 | struct netvsc_device *net_device; |
206 | struct nvsp_message *init_packet; | |
fceaf24a | 207 | |
5a71ae30 | 208 | net_device = get_outbound_net_device(device); |
85799a37 | 209 | if (!net_device) { |
21a80820 GKH |
210 | DPRINT_ERR(NETVSC, "unable to get net device..." |
211 | "device being destroyed?"); | |
fceaf24a HJ |
212 | return -1; |
213 | } | |
fceaf24a | 214 | |
53d21fdb | 215 | net_device->recv_buf = |
df3493e0 S |
216 | (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
217 | get_order(net_device->recv_buf_size)); | |
53d21fdb | 218 | if (!net_device->recv_buf) { |
21a80820 GKH |
219 | DPRINT_ERR(NETVSC, |
220 | "unable to allocate receive buffer of size %d", | |
53d21fdb | 221 | net_device->recv_buf_size); |
fceaf24a | 222 | ret = -1; |
0c3b7b2f | 223 | goto cleanup; |
fceaf24a | 224 | } |
fceaf24a HJ |
225 | |
226 | DPRINT_INFO(NETVSC, "Establishing receive buffer's GPADL..."); | |
227 | ||
454f18a9 BP |
228 | /* |
229 | * Establish the gpadl handle for this buffer on this | |
230 | * channel. Note: This call uses the vmbus connection rather | |
231 | * than the channel to establish the gpadl handle. | |
232 | */ | |
53d21fdb HZ |
233 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
234 | net_device->recv_buf_size, | |
235 | &net_device->recv_buf_gpadl_handle); | |
21a80820 GKH |
236 | if (ret != 0) { |
237 | DPRINT_ERR(NETVSC, | |
238 | "unable to establish receive buffer's gpadl"); | |
0c3b7b2f | 239 | goto cleanup; |
fceaf24a HJ |
240 | } |
241 | ||
fceaf24a | 242 | |
454f18a9 | 243 | /* Notify the NetVsp of the gpadl handle */ |
fceaf24a HJ |
244 | DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendReceiveBuffer..."); |
245 | ||
53d21fdb | 246 | init_packet = &net_device->channel_init_pkt; |
fceaf24a | 247 | |
85799a37 | 248 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 249 | |
53d21fdb HZ |
250 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
251 | init_packet->msg.v1_msg.send_recv_buf. | |
252 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
253 | init_packet->msg.v1_msg. | |
254 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 255 | |
454f18a9 | 256 | /* Send the gpadl notification request */ |
0c3b7b2f | 257 | net_device->wait_condition = 0; |
85799a37 | 258 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 259 | sizeof(struct nvsp_message), |
85799a37 | 260 | (unsigned long)init_packet, |
415f2287 | 261 | VM_PKT_DATA_INBAND, |
5a4df290 | 262 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 GKH |
263 | if (ret != 0) { |
264 | DPRINT_ERR(NETVSC, | |
265 | "unable to send receive buffer's gpadl to netvsp"); | |
0c3b7b2f | 266 | goto cleanup; |
fceaf24a HJ |
267 | } |
268 | ||
0c3b7b2f S |
269 | wait_event_timeout(net_device->channel_init_wait, |
270 | net_device->wait_condition, | |
271 | msecs_to_jiffies(1000)); | |
272 | BUG_ON(net_device->wait_condition == 0); | |
273 | ||
fceaf24a | 274 | |
454f18a9 | 275 | /* Check the response */ |
53d21fdb HZ |
276 | if (init_packet->msg.v1_msg. |
277 | send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { | |
21a80820 GKH |
278 | DPRINT_ERR(NETVSC, "Unable to complete receive buffer " |
279 | "initialzation with NetVsp - status %d", | |
53d21fdb HZ |
280 | init_packet->msg.v1_msg. |
281 | send_recv_buf_complete.status); | |
fceaf24a | 282 | ret = -1; |
0c3b7b2f | 283 | goto cleanup; |
fceaf24a HJ |
284 | } |
285 | ||
454f18a9 | 286 | /* Parse the response */ |
fceaf24a | 287 | |
53d21fdb HZ |
288 | net_device->recv_section_cnt = init_packet->msg. |
289 | v1_msg.send_recv_buf_complete.num_sections; | |
fceaf24a | 290 | |
53d21fdb | 291 | net_device->recv_section = kmalloc(net_device->recv_section_cnt |
85799a37 | 292 | * sizeof(struct nvsp_1_receive_buffer_section), GFP_KERNEL); |
53d21fdb | 293 | if (net_device->recv_section == NULL) { |
fceaf24a | 294 | ret = -1; |
0c3b7b2f | 295 | goto cleanup; |
fceaf24a HJ |
296 | } |
297 | ||
53d21fdb HZ |
298 | memcpy(net_device->recv_section, |
299 | init_packet->msg.v1_msg. | |
300 | send_recv_buf_complete.sections, | |
301 | net_device->recv_section_cnt * | |
85799a37 | 302 | sizeof(struct nvsp_1_receive_buffer_section)); |
fceaf24a | 303 | |
21a80820 GKH |
304 | DPRINT_INFO(NETVSC, "Receive sections info (count %d, offset %d, " |
305 | "endoffset %d, suballoc size %d, num suballocs %d)", | |
53d21fdb HZ |
306 | net_device->recv_section_cnt, |
307 | net_device->recv_section[0].offset, | |
308 | net_device->recv_section[0].end_offset, | |
309 | net_device->recv_section[0].sub_alloc_size, | |
310 | net_device->recv_section[0].num_sub_allocs); | |
fceaf24a | 311 | |
21a80820 GKH |
312 | /* |
313 | * For 1st release, there should only be 1 section that represents the | |
314 | * entire receive buffer | |
315 | */ | |
53d21fdb HZ |
316 | if (net_device->recv_section_cnt != 1 || |
317 | net_device->recv_section->offset != 0) { | |
fceaf24a | 318 | ret = -1; |
0c3b7b2f | 319 | goto cleanup; |
fceaf24a HJ |
320 | } |
321 | ||
0c3b7b2f | 322 | goto exit; |
fceaf24a | 323 | |
0c3b7b2f | 324 | cleanup: |
5a71ae30 | 325 | netvsc_destroy_recv_buf(net_device); |
fceaf24a | 326 | |
0c3b7b2f | 327 | exit: |
5a71ae30 | 328 | put_net_device(device); |
fceaf24a HJ |
329 | return ret; |
330 | } | |
331 | ||
5a71ae30 | 332 | static int netvsc_init_send_buf(struct hv_device *device) |
fceaf24a | 333 | { |
21a80820 | 334 | int ret = 0; |
85799a37 HZ |
335 | struct netvsc_device *net_device; |
336 | struct nvsp_message *init_packet; | |
fceaf24a | 337 | |
5a71ae30 | 338 | net_device = get_outbound_net_device(device); |
85799a37 | 339 | if (!net_device) { |
21a80820 GKH |
340 | DPRINT_ERR(NETVSC, "unable to get net device..." |
341 | "device being destroyed?"); | |
fceaf24a HJ |
342 | return -1; |
343 | } | |
53d21fdb | 344 | if (net_device->send_buf_size <= 0) { |
79069684 | 345 | ret = -EINVAL; |
0c3b7b2f | 346 | goto cleanup; |
79069684 BP |
347 | } |
348 | ||
53d21fdb | 349 | net_device->send_buf = |
df3493e0 S |
350 | (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
351 | get_order(net_device->send_buf_size)); | |
53d21fdb | 352 | if (!net_device->send_buf) { |
21a80820 | 353 | DPRINT_ERR(NETVSC, "unable to allocate send buffer of size %d", |
53d21fdb | 354 | net_device->send_buf_size); |
fceaf24a | 355 | ret = -1; |
0c3b7b2f | 356 | goto cleanup; |
fceaf24a | 357 | } |
fceaf24a HJ |
358 | |
359 | DPRINT_INFO(NETVSC, "Establishing send buffer's GPADL..."); | |
360 | ||
454f18a9 BP |
361 | /* |
362 | * Establish the gpadl handle for this buffer on this | |
363 | * channel. Note: This call uses the vmbus connection rather | |
364 | * than the channel to establish the gpadl handle. | |
365 | */ | |
53d21fdb HZ |
366 | ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, |
367 | net_device->send_buf_size, | |
368 | &net_device->send_buf_gpadl_handle); | |
21a80820 | 369 | if (ret != 0) { |
fceaf24a | 370 | DPRINT_ERR(NETVSC, "unable to establish send buffer's gpadl"); |
0c3b7b2f | 371 | goto cleanup; |
fceaf24a HJ |
372 | } |
373 | ||
454f18a9 | 374 | /* Notify the NetVsp of the gpadl handle */ |
fceaf24a HJ |
375 | DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendSendBuffer..."); |
376 | ||
53d21fdb | 377 | init_packet = &net_device->channel_init_pkt; |
fceaf24a | 378 | |
85799a37 | 379 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 380 | |
53d21fdb HZ |
381 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; |
382 | init_packet->msg.v1_msg.send_recv_buf. | |
383 | gpadl_handle = net_device->send_buf_gpadl_handle; | |
384 | init_packet->msg.v1_msg.send_recv_buf.id = | |
85799a37 | 385 | NETVSC_SEND_BUFFER_ID; |
fceaf24a | 386 | |
454f18a9 | 387 | /* Send the gpadl notification request */ |
0c3b7b2f | 388 | net_device->wait_condition = 0; |
85799a37 | 389 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 390 | sizeof(struct nvsp_message), |
85799a37 | 391 | (unsigned long)init_packet, |
415f2287 | 392 | VM_PKT_DATA_INBAND, |
5a4df290 | 393 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 GKH |
394 | if (ret != 0) { |
395 | DPRINT_ERR(NETVSC, | |
396 | "unable to send receive buffer's gpadl to netvsp"); | |
0c3b7b2f | 397 | goto cleanup; |
fceaf24a HJ |
398 | } |
399 | ||
0c3b7b2f S |
400 | wait_event_timeout(net_device->channel_init_wait, |
401 | net_device->wait_condition, | |
402 | msecs_to_jiffies(1000)); | |
403 | BUG_ON(net_device->wait_condition == 0); | |
fceaf24a | 404 | |
454f18a9 | 405 | /* Check the response */ |
53d21fdb HZ |
406 | if (init_packet->msg.v1_msg. |
407 | send_send_buf_complete.status != NVSP_STAT_SUCCESS) { | |
21a80820 GKH |
408 | DPRINT_ERR(NETVSC, "Unable to complete send buffer " |
409 | "initialzation with NetVsp - status %d", | |
53d21fdb HZ |
410 | init_packet->msg.v1_msg. |
411 | send_send_buf_complete.status); | |
fceaf24a | 412 | ret = -1; |
0c3b7b2f | 413 | goto cleanup; |
fceaf24a HJ |
414 | } |
415 | ||
53d21fdb HZ |
416 | net_device->send_section_size = init_packet-> |
417 | msg.v1_msg.send_send_buf_complete.section_size; | |
fceaf24a | 418 | |
0c3b7b2f | 419 | goto exit; |
fceaf24a | 420 | |
0c3b7b2f | 421 | cleanup: |
5a71ae30 | 422 | netvsc_destroy_send_buf(net_device); |
fceaf24a | 423 | |
0c3b7b2f | 424 | exit: |
5a71ae30 | 425 | put_net_device(device); |
fceaf24a HJ |
426 | return ret; |
427 | } | |
428 | ||
5a71ae30 | 429 | static int netvsc_destroy_recv_buf(struct netvsc_device *net_device) |
fceaf24a | 430 | { |
85799a37 | 431 | struct nvsp_message *revoke_packet; |
21a80820 | 432 | int ret = 0; |
fceaf24a | 433 | |
454f18a9 BP |
434 | /* |
435 | * If we got a section count, it means we received a | |
436 | * SendReceiveBufferComplete msg (ie sent | |
437 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
438 | * to send a revoke msg here | |
439 | */ | |
53d21fdb | 440 | if (net_device->recv_section_cnt) { |
21a80820 GKH |
441 | DPRINT_INFO(NETVSC, |
442 | "Sending NvspMessage1TypeRevokeReceiveBuffer..."); | |
fceaf24a | 443 | |
454f18a9 | 444 | /* Send the revoke receive buffer */ |
53d21fdb | 445 | revoke_packet = &net_device->revoke_packet; |
85799a37 | 446 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 447 | |
53d21fdb HZ |
448 | revoke_packet->hdr.msg_type = |
449 | NVSP_MSG1_TYPE_REVOKE_RECV_BUF; | |
450 | revoke_packet->msg.v1_msg. | |
451 | revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 452 | |
53d21fdb | 453 | ret = vmbus_sendpacket(net_device->dev->channel, |
85799a37 | 454 | revoke_packet, |
5a4df290 | 455 | sizeof(struct nvsp_message), |
85799a37 | 456 | (unsigned long)revoke_packet, |
415f2287 | 457 | VM_PKT_DATA_INBAND, 0); |
454f18a9 BP |
458 | /* |
459 | * If we failed here, we might as well return and | |
460 | * have a leak rather than continue and a bugchk | |
461 | */ | |
21a80820 GKH |
462 | if (ret != 0) { |
463 | DPRINT_ERR(NETVSC, "unable to send revoke receive " | |
464 | "buffer to netvsp"); | |
fceaf24a HJ |
465 | return -1; |
466 | } | |
467 | } | |
468 | ||
454f18a9 | 469 | /* Teardown the gpadl on the vsp end */ |
53d21fdb | 470 | if (net_device->recv_buf_gpadl_handle) { |
fceaf24a HJ |
471 | DPRINT_INFO(NETVSC, "Tearing down receive buffer's GPADL..."); |
472 | ||
53d21fdb HZ |
473 | ret = vmbus_teardown_gpadl(net_device->dev->channel, |
474 | net_device->recv_buf_gpadl_handle); | |
fceaf24a | 475 | |
454f18a9 | 476 | /* If we failed here, we might as well return and have a leak rather than continue and a bugchk */ |
21a80820 GKH |
477 | if (ret != 0) { |
478 | DPRINT_ERR(NETVSC, | |
479 | "unable to teardown receive buffer's gpadl"); | |
fceaf24a HJ |
480 | return -1; |
481 | } | |
53d21fdb | 482 | net_device->recv_buf_gpadl_handle = 0; |
fceaf24a HJ |
483 | } |
484 | ||
53d21fdb | 485 | if (net_device->recv_buf) { |
fceaf24a HJ |
486 | DPRINT_INFO(NETVSC, "Freeing up receive buffer..."); |
487 | ||
454f18a9 | 488 | /* Free up the receive buffer */ |
df3493e0 S |
489 | free_pages((unsigned long)net_device->recv_buf, |
490 | get_order(net_device->recv_buf_size)); | |
53d21fdb | 491 | net_device->recv_buf = NULL; |
fceaf24a HJ |
492 | } |
493 | ||
53d21fdb HZ |
494 | if (net_device->recv_section) { |
495 | net_device->recv_section_cnt = 0; | |
496 | kfree(net_device->recv_section); | |
497 | net_device->recv_section = NULL; | |
fceaf24a HJ |
498 | } |
499 | ||
fceaf24a HJ |
500 | return ret; |
501 | } | |
502 | ||
5a71ae30 | 503 | static int netvsc_destroy_send_buf(struct netvsc_device *net_device) |
fceaf24a | 504 | { |
85799a37 | 505 | struct nvsp_message *revoke_packet; |
21a80820 | 506 | int ret = 0; |
fceaf24a | 507 | |
454f18a9 BP |
508 | /* |
509 | * If we got a section count, it means we received a | |
510 | * SendReceiveBufferComplete msg (ie sent | |
511 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
512 | * to send a revoke msg here | |
513 | */ | |
53d21fdb | 514 | if (net_device->send_section_size) { |
21a80820 GKH |
515 | DPRINT_INFO(NETVSC, |
516 | "Sending NvspMessage1TypeRevokeSendBuffer..."); | |
fceaf24a | 517 | |
454f18a9 | 518 | /* Send the revoke send buffer */ |
53d21fdb | 519 | revoke_packet = &net_device->revoke_packet; |
85799a37 | 520 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 521 | |
53d21fdb HZ |
522 | revoke_packet->hdr.msg_type = |
523 | NVSP_MSG1_TYPE_REVOKE_SEND_BUF; | |
524 | revoke_packet->msg.v1_msg. | |
525 | revoke_send_buf.id = NETVSC_SEND_BUFFER_ID; | |
fceaf24a | 526 | |
53d21fdb | 527 | ret = vmbus_sendpacket(net_device->dev->channel, |
85799a37 | 528 | revoke_packet, |
5a4df290 | 529 | sizeof(struct nvsp_message), |
85799a37 | 530 | (unsigned long)revoke_packet, |
415f2287 | 531 | VM_PKT_DATA_INBAND, 0); |
21a80820 GKH |
532 | /* |
533 | * If we failed here, we might as well return and have a leak | |
534 | * rather than continue and a bugchk | |
535 | */ | |
536 | if (ret != 0) { | |
537 | DPRINT_ERR(NETVSC, "unable to send revoke send buffer " | |
538 | "to netvsp"); | |
fceaf24a HJ |
539 | return -1; |
540 | } | |
541 | } | |
542 | ||
454f18a9 | 543 | /* Teardown the gpadl on the vsp end */ |
53d21fdb | 544 | if (net_device->send_buf_gpadl_handle) { |
fceaf24a | 545 | DPRINT_INFO(NETVSC, "Tearing down send buffer's GPADL..."); |
53d21fdb HZ |
546 | ret = vmbus_teardown_gpadl(net_device->dev->channel, |
547 | net_device->send_buf_gpadl_handle); | |
fceaf24a | 548 | |
21a80820 GKH |
549 | /* |
550 | * If we failed here, we might as well return and have a leak | |
551 | * rather than continue and a bugchk | |
552 | */ | |
553 | if (ret != 0) { | |
554 | DPRINT_ERR(NETVSC, "unable to teardown send buffer's " | |
555 | "gpadl"); | |
fceaf24a HJ |
556 | return -1; |
557 | } | |
53d21fdb | 558 | net_device->send_buf_gpadl_handle = 0; |
fceaf24a HJ |
559 | } |
560 | ||
53d21fdb | 561 | if (net_device->send_buf) { |
fceaf24a HJ |
562 | DPRINT_INFO(NETVSC, "Freeing up send buffer..."); |
563 | ||
454f18a9 | 564 | /* Free up the receive buffer */ |
df3493e0 S |
565 | free_pages((unsigned long)net_device->send_buf, |
566 | get_order(net_device->send_buf_size)); | |
53d21fdb | 567 | net_device->send_buf = NULL; |
fceaf24a HJ |
568 | } |
569 | ||
fceaf24a HJ |
570 | return ret; |
571 | } | |
572 | ||
573 | ||
5a71ae30 | 574 | static int netvsc_connect_vsp(struct hv_device *device) |
fceaf24a | 575 | { |
21a80820 | 576 | int ret; |
85799a37 HZ |
577 | struct netvsc_device *net_device; |
578 | struct nvsp_message *init_packet; | |
579 | int ndis_version; | |
fceaf24a | 580 | |
5a71ae30 | 581 | net_device = get_outbound_net_device(device); |
85799a37 | 582 | if (!net_device) { |
21a80820 GKH |
583 | DPRINT_ERR(NETVSC, "unable to get net device..." |
584 | "device being destroyed?"); | |
fceaf24a HJ |
585 | return -1; |
586 | } | |
587 | ||
53d21fdb | 588 | init_packet = &net_device->channel_init_pkt; |
fceaf24a | 589 | |
85799a37 | 590 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb HZ |
591 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
592 | init_packet->msg.init_msg.init.min_protocol_ver = | |
85799a37 | 593 | NVSP_MIN_PROTOCOL_VERSION; |
53d21fdb | 594 | init_packet->msg.init_msg.init.max_protocol_ver = |
85799a37 | 595 | NVSP_MAX_PROTOCOL_VERSION; |
fceaf24a HJ |
596 | |
597 | DPRINT_INFO(NETVSC, "Sending NvspMessageTypeInit..."); | |
598 | ||
454f18a9 | 599 | /* Send the init request */ |
0c3b7b2f | 600 | net_device->wait_condition = 0; |
85799a37 | 601 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 602 | sizeof(struct nvsp_message), |
85799a37 | 603 | (unsigned long)init_packet, |
415f2287 | 604 | VM_PKT_DATA_INBAND, |
5a4df290 | 605 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 GKH |
606 | |
607 | if (ret != 0) { | |
fceaf24a | 608 | DPRINT_ERR(NETVSC, "unable to send NvspMessageTypeInit"); |
0c3b7b2f | 609 | goto cleanup; |
fceaf24a HJ |
610 | } |
611 | ||
0c3b7b2f S |
612 | wait_event_timeout(net_device->channel_init_wait, |
613 | net_device->wait_condition, | |
614 | msecs_to_jiffies(1000)); | |
615 | if (net_device->wait_condition == 0) { | |
616 | ret = -ETIMEDOUT; | |
617 | goto cleanup; | |
618 | } | |
fceaf24a | 619 | |
fceaf24a | 620 | DPRINT_INFO(NETVSC, "NvspMessageTypeInit status(%d) max mdl chain (%d)", |
53d21fdb HZ |
621 | init_packet->msg.init_msg.init_complete.status, |
622 | init_packet->msg.init_msg. | |
623 | init_complete.max_mdl_chain_len); | |
fceaf24a | 624 | |
53d21fdb HZ |
625 | if (init_packet->msg.init_msg.init_complete.status != |
626 | NVSP_STAT_SUCCESS) { | |
21a80820 GKH |
627 | DPRINT_ERR(NETVSC, |
628 | "unable to initialize with netvsp (status 0x%x)", | |
53d21fdb | 629 | init_packet->msg.init_msg.init_complete.status); |
fceaf24a | 630 | ret = -1; |
0c3b7b2f | 631 | goto cleanup; |
fceaf24a HJ |
632 | } |
633 | ||
53d21fdb HZ |
634 | if (init_packet->msg.init_msg.init_complete. |
635 | negotiated_protocol_ver != NVSP_PROTOCOL_VERSION_1) { | |
21a80820 GKH |
636 | DPRINT_ERR(NETVSC, "unable to initialize with netvsp " |
637 | "(version expected 1 got %d)", | |
53d21fdb HZ |
638 | init_packet->msg.init_msg. |
639 | init_complete.negotiated_protocol_ver); | |
fceaf24a | 640 | ret = -1; |
0c3b7b2f | 641 | goto cleanup; |
fceaf24a HJ |
642 | } |
643 | DPRINT_INFO(NETVSC, "Sending NvspMessage1TypeSendNdisVersion..."); | |
644 | ||
454f18a9 | 645 | /* Send the ndis version */ |
85799a37 | 646 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 647 | |
85799a37 | 648 | ndis_version = 0x00050000; |
fceaf24a | 649 | |
53d21fdb HZ |
650 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
651 | init_packet->msg.v1_msg. | |
652 | send_ndis_ver.ndis_major_ver = | |
85799a37 | 653 | (ndis_version & 0xFFFF0000) >> 16; |
53d21fdb HZ |
654 | init_packet->msg.v1_msg. |
655 | send_ndis_ver.ndis_minor_ver = | |
85799a37 | 656 | ndis_version & 0xFFFF; |
fceaf24a | 657 | |
454f18a9 | 658 | /* Send the init request */ |
85799a37 | 659 | ret = vmbus_sendpacket(device->channel, init_packet, |
0c3b7b2f S |
660 | sizeof(struct nvsp_message), |
661 | (unsigned long)init_packet, | |
662 | VM_PKT_DATA_INBAND, 0); | |
21a80820 GKH |
663 | if (ret != 0) { |
664 | DPRINT_ERR(NETVSC, | |
665 | "unable to send NvspMessage1TypeSendNdisVersion"); | |
fceaf24a | 666 | ret = -1; |
0c3b7b2f | 667 | goto cleanup; |
fceaf24a | 668 | } |
454f18a9 BP |
669 | |
670 | /* Post the big receive buffer to NetVSP */ | |
5a71ae30 | 671 | ret = netvsc_init_recv_buf(device); |
fceaf24a | 672 | if (ret == 0) |
5a71ae30 | 673 | ret = netvsc_init_send_buf(device); |
fceaf24a | 674 | |
0c3b7b2f | 675 | cleanup: |
5a71ae30 | 676 | put_net_device(device); |
fceaf24a HJ |
677 | return ret; |
678 | } | |
679 | ||
85799a37 | 680 | static void NetVscDisconnectFromVsp(struct netvsc_device *net_device) |
fceaf24a | 681 | { |
5a71ae30 HZ |
682 | netvsc_destroy_recv_buf(net_device); |
683 | netvsc_destroy_send_buf(net_device); | |
fceaf24a HJ |
684 | } |
685 | ||
3e189519 | 686 | /* |
5a71ae30 HZ |
687 | * netvsc_device_add - Callback when the device belonging to this |
688 | * driver is added | |
21a80820 | 689 | */ |
5a71ae30 | 690 | static int netvsc_device_add(struct hv_device *device, void *additional_info) |
fceaf24a | 691 | { |
21a80820 | 692 | int ret = 0; |
fceaf24a | 693 | int i; |
85799a37 | 694 | struct netvsc_device *net_device; |
d29274ef | 695 | struct hv_netvsc_packet *packet, *pos; |
85799a37 | 696 | struct netvsc_driver *net_driver = |
ca623ad3 | 697 | (struct netvsc_driver *)device->drv; |
fceaf24a | 698 | |
5a71ae30 | 699 | net_device = alloc_net_device(device); |
85799a37 | 700 | if (!net_device) { |
fceaf24a | 701 | ret = -1; |
0c3b7b2f | 702 | goto cleanup; |
fceaf24a HJ |
703 | } |
704 | ||
85799a37 | 705 | DPRINT_DBG(NETVSC, "netvsc channel object allocated - %p", net_device); |
fceaf24a | 706 | |
454f18a9 | 707 | /* Initialize the NetVSC channel extension */ |
53d21fdb HZ |
708 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; |
709 | spin_lock_init(&net_device->recv_pkt_list_lock); | |
fceaf24a | 710 | |
53d21fdb | 711 | net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; |
fceaf24a | 712 | |
53d21fdb | 713 | INIT_LIST_HEAD(&net_device->recv_pkt_list); |
fceaf24a | 714 | |
21a80820 GKH |
715 | for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) { |
716 | packet = kzalloc(sizeof(struct hv_netvsc_packet) + | |
717 | (NETVSC_RECEIVE_SG_COUNT * | |
718 | sizeof(struct hv_page_buffer)), GFP_KERNEL); | |
719 | if (!packet) { | |
720 | DPRINT_DBG(NETVSC, "unable to allocate netvsc pkts " | |
721 | "for receive pool (wanted %d got %d)", | |
722 | NETVSC_RECEIVE_PACKETLIST_COUNT, i); | |
fceaf24a HJ |
723 | break; |
724 | } | |
72a2f5bd | 725 | list_add_tail(&packet->list_ent, |
53d21fdb | 726 | &net_device->recv_pkt_list); |
fceaf24a | 727 | } |
0c3b7b2f | 728 | init_waitqueue_head(&net_device->channel_init_wait); |
fceaf24a | 729 | |
454f18a9 | 730 | /* Open the channel */ |
72a2f5bd HZ |
731 | ret = vmbus_open(device->channel, net_driver->ring_buf_size, |
732 | net_driver->ring_buf_size, NULL, 0, | |
5a71ae30 | 733 | netvsc_channel_cb, device); |
fceaf24a | 734 | |
21a80820 | 735 | if (ret != 0) { |
fceaf24a HJ |
736 | DPRINT_ERR(NETVSC, "unable to open channel: %d", ret); |
737 | ret = -1; | |
0c3b7b2f | 738 | goto cleanup; |
fceaf24a HJ |
739 | } |
740 | ||
454f18a9 | 741 | /* Channel is opened */ |
fceaf24a HJ |
742 | DPRINT_INFO(NETVSC, "*** NetVSC channel opened successfully! ***"); |
743 | ||
454f18a9 | 744 | /* Connect with the NetVsp */ |
5a71ae30 | 745 | ret = netvsc_connect_vsp(device); |
21a80820 | 746 | if (ret != 0) { |
fceaf24a HJ |
747 | DPRINT_ERR(NETVSC, "unable to connect to NetVSP - %d", ret); |
748 | ret = -1; | |
1fb9dff0 | 749 | goto close; |
fceaf24a HJ |
750 | } |
751 | ||
21a80820 GKH |
752 | DPRINT_INFO(NETVSC, "*** NetVSC channel handshake result - %d ***", |
753 | ret); | |
fceaf24a | 754 | |
fceaf24a HJ |
755 | return ret; |
756 | ||
1fb9dff0 | 757 | close: |
454f18a9 | 758 | /* Now, we can close the channel safely */ |
85799a37 | 759 | vmbus_close(device->channel); |
fceaf24a | 760 | |
0c3b7b2f | 761 | cleanup: |
fceaf24a | 762 | |
85799a37 | 763 | if (net_device) { |
d29274ef | 764 | list_for_each_entry_safe(packet, pos, |
53d21fdb | 765 | &net_device->recv_pkt_list, |
72a2f5bd HZ |
766 | list_ent) { |
767 | list_del(&packet->list_ent); | |
8c69f52a | 768 | kfree(packet); |
fceaf24a HJ |
769 | } |
770 | ||
5a71ae30 HZ |
771 | release_outbound_net_device(device); |
772 | release_inbound_net_device(device); | |
fceaf24a | 773 | |
5a71ae30 | 774 | free_net_device(net_device); |
fceaf24a HJ |
775 | } |
776 | ||
fceaf24a HJ |
777 | return ret; |
778 | } | |
779 | ||
3e189519 | 780 | /* |
5a71ae30 | 781 | * netvsc_device_remove - Callback when the root bus device is removed |
21a80820 | 782 | */ |
5a71ae30 | 783 | static int netvsc_device_remove(struct hv_device *device) |
fceaf24a | 784 | { |
85799a37 HZ |
785 | struct netvsc_device *net_device; |
786 | struct hv_netvsc_packet *netvsc_packet, *pos; | |
fceaf24a | 787 | |
21a80820 | 788 | DPRINT_INFO(NETVSC, "Disabling outbound traffic on net device (%p)...", |
ca623ad3 | 789 | device->ext); |
fceaf24a | 790 | |
454f18a9 | 791 | /* Stop outbound traffic ie sends and receives completions */ |
5a71ae30 | 792 | net_device = release_outbound_net_device(device); |
85799a37 | 793 | if (!net_device) { |
fceaf24a HJ |
794 | DPRINT_ERR(NETVSC, "No net device present!!"); |
795 | return -1; | |
796 | } | |
797 | ||
454f18a9 | 798 | /* Wait for all send completions */ |
53d21fdb | 799 | while (atomic_read(&net_device->num_outstanding_sends)) { |
21a80820 | 800 | DPRINT_INFO(NETVSC, "waiting for %d requests to complete...", |
53d21fdb | 801 | atomic_read(&net_device->num_outstanding_sends)); |
b4362c9c | 802 | udelay(100); |
fceaf24a HJ |
803 | } |
804 | ||
805 | DPRINT_INFO(NETVSC, "Disconnecting from netvsp..."); | |
806 | ||
85799a37 | 807 | NetVscDisconnectFromVsp(net_device); |
fceaf24a | 808 | |
21a80820 | 809 | DPRINT_INFO(NETVSC, "Disabling inbound traffic on net device (%p)...", |
ca623ad3 | 810 | device->ext); |
fceaf24a | 811 | |
454f18a9 | 812 | /* Stop inbound traffic ie receives and sends completions */ |
5a71ae30 | 813 | net_device = release_inbound_net_device(device); |
fceaf24a | 814 | |
454f18a9 | 815 | /* At this point, no one should be accessing netDevice except in here */ |
85799a37 | 816 | DPRINT_INFO(NETVSC, "net device (%p) safe to remove", net_device); |
fceaf24a | 817 | |
454f18a9 | 818 | /* Now, we can close the channel safely */ |
85799a37 | 819 | vmbus_close(device->channel); |
fceaf24a | 820 | |
454f18a9 | 821 | /* Release all resources */ |
85799a37 | 822 | list_for_each_entry_safe(netvsc_packet, pos, |
53d21fdb | 823 | &net_device->recv_pkt_list, list_ent) { |
72a2f5bd | 824 | list_del(&netvsc_packet->list_ent); |
85799a37 | 825 | kfree(netvsc_packet); |
fceaf24a HJ |
826 | } |
827 | ||
5a71ae30 | 828 | free_net_device(net_device); |
21a80820 | 829 | return 0; |
fceaf24a HJ |
830 | } |
831 | ||
3e189519 | 832 | /* |
5a71ae30 | 833 | * netvsc_cleanup - Perform any cleanup when the driver is removed |
21a80820 | 834 | */ |
5a71ae30 | 835 | static void netvsc_cleanup(struct hv_driver *drv) |
fceaf24a | 836 | { |
fceaf24a HJ |
837 | } |
838 | ||
5a71ae30 | 839 | static void netvsc_send_completion(struct hv_device *device, |
85799a37 | 840 | struct vmpacket_descriptor *packet) |
fceaf24a | 841 | { |
85799a37 HZ |
842 | struct netvsc_device *net_device; |
843 | struct nvsp_message *nvsp_packet; | |
844 | struct hv_netvsc_packet *nvsc_packet; | |
fceaf24a | 845 | |
5a71ae30 | 846 | net_device = get_inbound_net_device(device); |
85799a37 | 847 | if (!net_device) { |
21a80820 GKH |
848 | DPRINT_ERR(NETVSC, "unable to get net device..." |
849 | "device being destroyed?"); | |
fceaf24a HJ |
850 | return; |
851 | } | |
852 | ||
85799a37 | 853 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
415f2287 | 854 | (packet->offset8 << 3)); |
fceaf24a | 855 | |
21a80820 | 856 | DPRINT_DBG(NETVSC, "send completion packet - type %d", |
53d21fdb | 857 | nvsp_packet->hdr.msg_type); |
fceaf24a | 858 | |
53d21fdb HZ |
859 | if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || |
860 | (nvsp_packet->hdr.msg_type == | |
861 | NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || | |
862 | (nvsp_packet->hdr.msg_type == | |
863 | NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) { | |
454f18a9 | 864 | /* Copy the response back */ |
53d21fdb | 865 | memcpy(&net_device->channel_init_pkt, nvsp_packet, |
21a80820 | 866 | sizeof(struct nvsp_message)); |
0c3b7b2f S |
867 | net_device->wait_condition = 1; |
868 | wake_up(&net_device->channel_init_wait); | |
53d21fdb HZ |
869 | } else if (nvsp_packet->hdr.msg_type == |
870 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { | |
454f18a9 | 871 | /* Get the send context */ |
85799a37 | 872 | nvsc_packet = (struct hv_netvsc_packet *)(unsigned long) |
415f2287 | 873 | packet->trans_id; |
fceaf24a | 874 | |
454f18a9 | 875 | /* Notify the layer above us */ |
72a2f5bd HZ |
876 | nvsc_packet->completion.send.send_completion( |
877 | nvsc_packet->completion.send.send_completion_ctx); | |
fceaf24a | 878 | |
53d21fdb | 879 | atomic_dec(&net_device->num_outstanding_sends); |
21a80820 GKH |
880 | } else { |
881 | DPRINT_ERR(NETVSC, "Unknown send completion packet type - " | |
53d21fdb | 882 | "%d received!!", nvsp_packet->hdr.msg_type); |
fceaf24a HJ |
883 | } |
884 | ||
5a71ae30 | 885 | put_net_device(device); |
fceaf24a HJ |
886 | } |
887 | ||
5a71ae30 | 888 | static int netvsc_send(struct hv_device *device, |
85799a37 | 889 | struct hv_netvsc_packet *packet) |
fceaf24a | 890 | { |
85799a37 | 891 | struct netvsc_device *net_device; |
21a80820 | 892 | int ret = 0; |
fceaf24a | 893 | |
223c1aa6 | 894 | struct nvsp_message sendMessage; |
fceaf24a | 895 | |
5a71ae30 | 896 | net_device = get_outbound_net_device(device); |
85799a37 | 897 | if (!net_device) { |
21a80820 | 898 | DPRINT_ERR(NETVSC, "net device (%p) shutting down..." |
85799a37 | 899 | "ignoring outbound packets", net_device); |
fceaf24a HJ |
900 | return -2; |
901 | } | |
902 | ||
53d21fdb | 903 | sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
72a2f5bd | 904 | if (packet->is_data_pkt) { |
21a80820 | 905 | /* 0 is RMC_DATA; */ |
53d21fdb | 906 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0; |
21a80820 GKH |
907 | } else { |
908 | /* 1 is RMC_CONTROL; */ | |
53d21fdb | 909 | sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1; |
21a80820 | 910 | } |
fceaf24a | 911 | |
454f18a9 | 912 | /* Not using send buffer section */ |
53d21fdb HZ |
913 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index = |
914 | 0xFFFFFFFF; | |
915 | sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; | |
21a80820 | 916 | |
72a2f5bd | 917 | if (packet->page_buf_cnt) { |
85799a37 | 918 | ret = vmbus_sendpacket_pagebuffer(device->channel, |
72a2f5bd HZ |
919 | packet->page_buf, |
920 | packet->page_buf_cnt, | |
ff3f8eec GKH |
921 | &sendMessage, |
922 | sizeof(struct nvsp_message), | |
85799a37 | 923 | (unsigned long)packet); |
21a80820 | 924 | } else { |
85799a37 | 925 | ret = vmbus_sendpacket(device->channel, &sendMessage, |
5a4df290 | 926 | sizeof(struct nvsp_message), |
85799a37 | 927 | (unsigned long)packet, |
415f2287 | 928 | VM_PKT_DATA_INBAND, |
5a4df290 | 929 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
fceaf24a HJ |
930 | |
931 | } | |
932 | ||
933 | if (ret != 0) | |
21a80820 | 934 | DPRINT_ERR(NETVSC, "Unable to send packet %p ret %d", |
85799a37 | 935 | packet, ret); |
fceaf24a | 936 | |
53d21fdb | 937 | atomic_inc(&net_device->num_outstanding_sends); |
5a71ae30 | 938 | put_net_device(device); |
fceaf24a HJ |
939 | return ret; |
940 | } | |
941 | ||
5a71ae30 | 942 | static void netvsc_receive(struct hv_device *device, |
85799a37 | 943 | struct vmpacket_descriptor *packet) |
fceaf24a | 944 | { |
85799a37 HZ |
945 | struct netvsc_device *net_device; |
946 | struct vmtransfer_page_packet_header *vmxferpage_packet; | |
947 | struct nvsp_message *nvsp_packet; | |
948 | struct hv_netvsc_packet *netvsc_packet = NULL; | |
c4b0bc94 | 949 | unsigned long start; |
85799a37 | 950 | unsigned long end, end_virtual; |
7e23a6e9 | 951 | /* struct netvsc_driver *netvscDriver; */ |
85799a37 | 952 | struct xferpage_packet *xferpage_packet = NULL; |
21a80820 | 953 | int i, j; |
85799a37 | 954 | int count = 0, bytes_remain = 0; |
6436873a | 955 | unsigned long flags; |
d29274ef | 956 | LIST_HEAD(listHead); |
fceaf24a | 957 | |
5a71ae30 | 958 | net_device = get_inbound_net_device(device); |
85799a37 | 959 | if (!net_device) { |
21a80820 GKH |
960 | DPRINT_ERR(NETVSC, "unable to get net device..." |
961 | "device being destroyed?"); | |
fceaf24a HJ |
962 | return; |
963 | } | |
964 | ||
21a80820 GKH |
965 | /* |
966 | * All inbound packets other than send completion should be xfer page | |
967 | * packet | |
968 | */ | |
415f2287 | 969 | if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { |
21a80820 | 970 | DPRINT_ERR(NETVSC, "Unknown packet type received - %d", |
415f2287 | 971 | packet->type); |
5a71ae30 | 972 | put_net_device(device); |
fceaf24a HJ |
973 | return; |
974 | } | |
975 | ||
85799a37 | 976 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
415f2287 | 977 | (packet->offset8 << 3)); |
fceaf24a | 978 | |
454f18a9 | 979 | /* Make sure this is a valid nvsp packet */ |
53d21fdb HZ |
980 | if (nvsp_packet->hdr.msg_type != |
981 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { | |
21a80820 | 982 | DPRINT_ERR(NETVSC, "Unknown nvsp packet type received - %d", |
53d21fdb | 983 | nvsp_packet->hdr.msg_type); |
5a71ae30 | 984 | put_net_device(device); |
fceaf24a HJ |
985 | return; |
986 | } | |
987 | ||
21a80820 | 988 | DPRINT_DBG(NETVSC, "NVSP packet received - type %d", |
53d21fdb | 989 | nvsp_packet->hdr.msg_type); |
fceaf24a | 990 | |
85799a37 | 991 | vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; |
fceaf24a | 992 | |
415f2287 | 993 | if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { |
21a80820 GKH |
994 | DPRINT_ERR(NETVSC, "Invalid xfer page set id - " |
995 | "expecting %x got %x", NETVSC_RECEIVE_BUFFER_ID, | |
415f2287 | 996 | vmxferpage_packet->xfer_pageset_id); |
5a71ae30 | 997 | put_net_device(device); |
fceaf24a HJ |
998 | return; |
999 | } | |
1000 | ||
21a80820 | 1001 | DPRINT_DBG(NETVSC, "xfer page - range count %d", |
415f2287 | 1002 | vmxferpage_packet->range_cnt); |
fceaf24a | 1003 | |
454f18a9 BP |
1004 | /* |
1005 | * Grab free packets (range count + 1) to represent this xfer | |
1006 | * page packet. +1 to represent the xfer page packet itself. | |
1007 | * We grab it here so that we know exactly how many we can | |
1008 | * fulfil | |
1009 | */ | |
53d21fdb HZ |
1010 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
1011 | while (!list_empty(&net_device->recv_pkt_list)) { | |
1012 | list_move_tail(net_device->recv_pkt_list.next, &listHead); | |
415f2287 | 1013 | if (++count == vmxferpage_packet->range_cnt + 1) |
fceaf24a HJ |
1014 | break; |
1015 | } | |
53d21fdb | 1016 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); |
fceaf24a | 1017 | |
454f18a9 BP |
1018 | /* |
1019 | * We need at least 2 netvsc pkts (1 to represent the xfer | |
1020 | * page and at least 1 for the range) i.e. we can handled | |
1021 | * some of the xfer page packet ranges... | |
1022 | */ | |
21a80820 GKH |
1023 | if (count < 2) { |
1024 | DPRINT_ERR(NETVSC, "Got only %d netvsc pkt...needed %d pkts. " | |
1025 | "Dropping this xfer page packet completely!", | |
415f2287 | 1026 | count, vmxferpage_packet->range_cnt + 1); |
fceaf24a | 1027 | |
454f18a9 | 1028 | /* Return it to the freelist */ |
53d21fdb | 1029 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
21a80820 | 1030 | for (i = count; i != 0; i--) { |
92ec0893 | 1031 | list_move_tail(listHead.next, |
53d21fdb | 1032 | &net_device->recv_pkt_list); |
fceaf24a | 1033 | } |
53d21fdb | 1034 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, |
21a80820 | 1035 | flags); |
fceaf24a | 1036 | |
5a71ae30 | 1037 | netvsc_send_recv_completion(device, |
415f2287 | 1038 | vmxferpage_packet->d.trans_id); |
fceaf24a | 1039 | |
5a71ae30 | 1040 | put_net_device(device); |
fceaf24a HJ |
1041 | return; |
1042 | } | |
1043 | ||
454f18a9 | 1044 | /* Remove the 1st packet to represent the xfer page packet itself */ |
85799a37 | 1045 | xferpage_packet = (struct xferpage_packet *)listHead.next; |
72a2f5bd | 1046 | list_del(&xferpage_packet->list_ent); |
d29274ef | 1047 | |
21a80820 | 1048 | /* This is how much we can satisfy */ |
72a2f5bd | 1049 | xferpage_packet->count = count - 1; |
21a80820 | 1050 | |
415f2287 | 1051 | if (xferpage_packet->count != vmxferpage_packet->range_cnt) { |
21a80820 | 1052 | DPRINT_INFO(NETVSC, "Needed %d netvsc pkts to satisy this xfer " |
415f2287 | 1053 | "page...got %d", vmxferpage_packet->range_cnt, |
72a2f5bd | 1054 | xferpage_packet->count); |
fceaf24a HJ |
1055 | } |
1056 | ||
454f18a9 | 1057 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
21a80820 | 1058 | for (i = 0; i < (count - 1); i++) { |
85799a37 | 1059 | netvsc_packet = (struct hv_netvsc_packet *)listHead.next; |
72a2f5bd | 1060 | list_del(&netvsc_packet->list_ent); |
fceaf24a | 1061 | |
454f18a9 | 1062 | /* Initialize the netvsc packet */ |
72a2f5bd HZ |
1063 | netvsc_packet->xfer_page_pkt = xferpage_packet; |
1064 | netvsc_packet->completion.recv.recv_completion = | |
5a71ae30 | 1065 | netvsc_receive_completion; |
72a2f5bd | 1066 | netvsc_packet->completion.recv.recv_completion_ctx = |
85799a37 | 1067 | netvsc_packet; |
72a2f5bd | 1068 | netvsc_packet->device = device; |
21a80820 | 1069 | /* Save this so that we can send it back */ |
72a2f5bd | 1070 | netvsc_packet->completion.recv.recv_completion_tid = |
415f2287 | 1071 | vmxferpage_packet->d.trans_id; |
fceaf24a | 1072 | |
72a2f5bd | 1073 | netvsc_packet->total_data_buflen = |
415f2287 | 1074 | vmxferpage_packet->ranges[i].byte_count; |
72a2f5bd | 1075 | netvsc_packet->page_buf_cnt = 1; |
fceaf24a | 1076 | |
ca623ad3 | 1077 | netvsc_packet->page_buf[0].len = |
415f2287 | 1078 | vmxferpage_packet->ranges[i].byte_count; |
fceaf24a | 1079 | |
85799a37 | 1080 | start = virt_to_phys((void *)((unsigned long)net_device-> |
415f2287 | 1081 | recv_buf + vmxferpage_packet->ranges[i].byte_offset)); |
fceaf24a | 1082 | |
ca623ad3 | 1083 | netvsc_packet->page_buf[0].pfn = start >> PAGE_SHIFT; |
53d21fdb | 1084 | end_virtual = (unsigned long)net_device->recv_buf |
415f2287 HZ |
1085 | + vmxferpage_packet->ranges[i].byte_offset |
1086 | + vmxferpage_packet->ranges[i].byte_count - 1; | |
85799a37 | 1087 | end = virt_to_phys((void *)end_virtual); |
fceaf24a | 1088 | |
454f18a9 | 1089 | /* Calculate the page relative offset */ |
ca623ad3 | 1090 | netvsc_packet->page_buf[0].offset = |
415f2287 | 1091 | vmxferpage_packet->ranges[i].byte_offset & |
85799a37 | 1092 | (PAGE_SIZE - 1); |
21a80820 GKH |
1093 | if ((end >> PAGE_SHIFT) != (start >> PAGE_SHIFT)) { |
1094 | /* Handle frame across multiple pages: */ | |
ca623ad3 HZ |
1095 | netvsc_packet->page_buf[0].len = |
1096 | (netvsc_packet->page_buf[0].pfn << | |
85799a37 | 1097 | PAGE_SHIFT) |
21a80820 | 1098 | + PAGE_SIZE - start; |
72a2f5bd | 1099 | bytes_remain = netvsc_packet->total_data_buflen - |
ca623ad3 | 1100 | netvsc_packet->page_buf[0].len; |
21a80820 | 1101 | for (j = 1; j < NETVSC_PACKET_MAXPAGE; j++) { |
ca623ad3 | 1102 | netvsc_packet->page_buf[j].offset = 0; |
85799a37 | 1103 | if (bytes_remain <= PAGE_SIZE) { |
ca623ad3 | 1104 | netvsc_packet->page_buf[j].len = |
85799a37 HZ |
1105 | bytes_remain; |
1106 | bytes_remain = 0; | |
21a80820 | 1107 | } else { |
ca623ad3 | 1108 | netvsc_packet->page_buf[j].len = |
85799a37 HZ |
1109 | PAGE_SIZE; |
1110 | bytes_remain -= PAGE_SIZE; | |
21a80820 | 1111 | } |
ca623ad3 | 1112 | netvsc_packet->page_buf[j].pfn = |
85799a37 HZ |
1113 | virt_to_phys((void *)(end_virtual - |
1114 | bytes_remain)) >> PAGE_SHIFT; | |
72a2f5bd | 1115 | netvsc_packet->page_buf_cnt++; |
85799a37 | 1116 | if (bytes_remain == 0) |
21a80820 | 1117 | break; |
fceaf24a | 1118 | } |
fceaf24a | 1119 | } |
21a80820 GKH |
1120 | DPRINT_DBG(NETVSC, "[%d] - (abs offset %u len %u) => " |
1121 | "(pfn %llx, offset %u, len %u)", i, | |
415f2287 HZ |
1122 | vmxferpage_packet->ranges[i].byte_offset, |
1123 | vmxferpage_packet->ranges[i].byte_count, | |
ca623ad3 HZ |
1124 | netvsc_packet->page_buf[0].pfn, |
1125 | netvsc_packet->page_buf[0].offset, | |
1126 | netvsc_packet->page_buf[0].len); | |
fceaf24a | 1127 | |
454f18a9 | 1128 | /* Pass it to the upper layer */ |
ca623ad3 | 1129 | ((struct netvsc_driver *)device->drv)-> |
72a2f5bd | 1130 | recv_cb(device, netvsc_packet); |
fceaf24a | 1131 | |
5a71ae30 | 1132 | netvsc_receive_completion(netvsc_packet-> |
72a2f5bd | 1133 | completion.recv.recv_completion_ctx); |
fceaf24a HJ |
1134 | } |
1135 | ||
5a71ae30 | 1136 | put_net_device(device); |
fceaf24a HJ |
1137 | } |
1138 | ||
5a71ae30 | 1139 | static void netvsc_send_recv_completion(struct hv_device *device, |
85799a37 | 1140 | u64 transaction_id) |
fceaf24a | 1141 | { |
223c1aa6 | 1142 | struct nvsp_message recvcompMessage; |
21a80820 GKH |
1143 | int retries = 0; |
1144 | int ret; | |
fceaf24a | 1145 | |
21a80820 | 1146 | DPRINT_DBG(NETVSC, "Sending receive completion pkt - %llx", |
85799a37 | 1147 | transaction_id); |
fceaf24a | 1148 | |
53d21fdb HZ |
1149 | recvcompMessage.hdr.msg_type = |
1150 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; | |
fceaf24a | 1151 | |
454f18a9 | 1152 | /* FIXME: Pass in the status */ |
53d21fdb HZ |
1153 | recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = |
1154 | NVSP_STAT_SUCCESS; | |
fceaf24a HJ |
1155 | |
1156 | retry_send_cmplt: | |
454f18a9 | 1157 | /* Send the completion */ |
85799a37 HZ |
1158 | ret = vmbus_sendpacket(device->channel, &recvcompMessage, |
1159 | sizeof(struct nvsp_message), transaction_id, | |
415f2287 | 1160 | VM_PKT_COMP, 0); |
21a80820 GKH |
1161 | if (ret == 0) { |
1162 | /* success */ | |
454f18a9 | 1163 | /* no-op */ |
21a80820 GKH |
1164 | } else if (ret == -1) { |
1165 | /* no more room...wait a bit and attempt to retry 3 times */ | |
fceaf24a | 1166 | retries++; |
21a80820 | 1167 | DPRINT_ERR(NETVSC, "unable to send receive completion pkt " |
85799a37 | 1168 | "(tid %llx)...retrying %d", transaction_id, retries); |
fceaf24a | 1169 | |
21a80820 | 1170 | if (retries < 4) { |
b4362c9c | 1171 | udelay(100); |
fceaf24a | 1172 | goto retry_send_cmplt; |
21a80820 GKH |
1173 | } else { |
1174 | DPRINT_ERR(NETVSC, "unable to send receive completion " | |
1175 | "pkt (tid %llx)...give up retrying", | |
85799a37 | 1176 | transaction_id); |
fceaf24a | 1177 | } |
21a80820 GKH |
1178 | } else { |
1179 | DPRINT_ERR(NETVSC, "unable to send receive completion pkt - " | |
85799a37 | 1180 | "%llx", transaction_id); |
fceaf24a HJ |
1181 | } |
1182 | } | |
1183 | ||
454f18a9 | 1184 | /* Send a receive completion packet to RNDIS device (ie NetVsp) */ |
5a71ae30 | 1185 | static void netvsc_receive_completion(void *context) |
fceaf24a | 1186 | { |
85799a37 | 1187 | struct hv_netvsc_packet *packet = context; |
72a2f5bd | 1188 | struct hv_device *device = (struct hv_device *)packet->device; |
85799a37 HZ |
1189 | struct netvsc_device *net_device; |
1190 | u64 transaction_id = 0; | |
1191 | bool fsend_receive_comp = false; | |
6436873a | 1192 | unsigned long flags; |
fceaf24a | 1193 | |
21a80820 GKH |
1194 | /* |
1195 | * Even though it seems logical to do a GetOutboundNetDevice() here to | |
1196 | * send out receive completion, we are using GetInboundNetDevice() | |
1197 | * since we may have disable outbound traffic already. | |
1198 | */ | |
5a71ae30 | 1199 | net_device = get_inbound_net_device(device); |
85799a37 | 1200 | if (!net_device) { |
21a80820 GKH |
1201 | DPRINT_ERR(NETVSC, "unable to get net device..." |
1202 | "device being destroyed?"); | |
fceaf24a HJ |
1203 | return; |
1204 | } | |
1205 | ||
454f18a9 | 1206 | /* Overloading use of the lock. */ |
53d21fdb | 1207 | spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags); |
fceaf24a | 1208 | |
72a2f5bd | 1209 | packet->xfer_page_pkt->count--; |
fceaf24a | 1210 | |
21a80820 GKH |
1211 | /* |
1212 | * Last one in the line that represent 1 xfer page packet. | |
1213 | * Return the xfer page packet itself to the freelist | |
1214 | */ | |
72a2f5bd | 1215 | if (packet->xfer_page_pkt->count == 0) { |
85799a37 | 1216 | fsend_receive_comp = true; |
72a2f5bd HZ |
1217 | transaction_id = packet->completion.recv.recv_completion_tid; |
1218 | list_add_tail(&packet->xfer_page_pkt->list_ent, | |
53d21fdb | 1219 | &net_device->recv_pkt_list); |
fceaf24a | 1220 | |
fceaf24a HJ |
1221 | } |
1222 | ||
454f18a9 | 1223 | /* Put the packet back */ |
53d21fdb HZ |
1224 | list_add_tail(&packet->list_ent, &net_device->recv_pkt_list); |
1225 | spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags); | |
fceaf24a | 1226 | |
454f18a9 | 1227 | /* Send a receive completion for the xfer page packet */ |
85799a37 | 1228 | if (fsend_receive_comp) |
5a71ae30 | 1229 | netvsc_send_recv_completion(device, transaction_id); |
fceaf24a | 1230 | |
5a71ae30 | 1231 | put_net_device(device); |
fceaf24a HJ |
1232 | } |
1233 | ||
5a71ae30 | 1234 | static void netvsc_channel_cb(void *context) |
fceaf24a | 1235 | { |
21a80820 | 1236 | int ret; |
85799a37 HZ |
1237 | struct hv_device *device = context; |
1238 | struct netvsc_device *net_device; | |
1239 | u32 bytes_recvd; | |
1240 | u64 request_id; | |
c6fcf0ba | 1241 | unsigned char *packet; |
8dc0a06a | 1242 | struct vmpacket_descriptor *desc; |
c6fcf0ba BP |
1243 | unsigned char *buffer; |
1244 | int bufferlen = NETVSC_PACKET_SIZE; | |
fceaf24a | 1245 | |
c6fcf0ba | 1246 | packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char), |
d70c6731 | 1247 | GFP_ATOMIC); |
c6fcf0ba BP |
1248 | if (!packet) |
1249 | return; | |
1250 | buffer = packet; | |
1251 | ||
5a71ae30 | 1252 | net_device = get_inbound_net_device(device); |
85799a37 | 1253 | if (!net_device) { |
21a80820 | 1254 | DPRINT_ERR(NETVSC, "net device (%p) shutting down..." |
85799a37 | 1255 | "ignoring inbound packets", net_device); |
c6fcf0ba | 1256 | goto out; |
fceaf24a HJ |
1257 | } |
1258 | ||
21a80820 | 1259 | do { |
9f630068 | 1260 | ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen, |
85799a37 | 1261 | &bytes_recvd, &request_id); |
21a80820 | 1262 | if (ret == 0) { |
85799a37 | 1263 | if (bytes_recvd > 0) { |
21a80820 | 1264 | DPRINT_DBG(NETVSC, "receive %d bytes, tid %llx", |
85799a37 | 1265 | bytes_recvd, request_id); |
21a80820 GKH |
1266 | |
1267 | desc = (struct vmpacket_descriptor *)buffer; | |
415f2287 HZ |
1268 | switch (desc->type) { |
1269 | case VM_PKT_COMP: | |
5a71ae30 | 1270 | netvsc_send_completion(device, desc); |
21a80820 GKH |
1271 | break; |
1272 | ||
415f2287 | 1273 | case VM_PKT_DATA_USING_XFER_PAGES: |
5a71ae30 | 1274 | netvsc_receive(device, desc); |
21a80820 GKH |
1275 | break; |
1276 | ||
1277 | default: | |
1278 | DPRINT_ERR(NETVSC, | |
1279 | "unhandled packet type %d, " | |
1280 | "tid %llx len %d\n", | |
415f2287 | 1281 | desc->type, request_id, |
85799a37 | 1282 | bytes_recvd); |
21a80820 | 1283 | break; |
fceaf24a HJ |
1284 | } |
1285 | ||
454f18a9 | 1286 | /* reset */ |
c6fcf0ba | 1287 | if (bufferlen > NETVSC_PACKET_SIZE) { |
8c69f52a | 1288 | kfree(buffer); |
fceaf24a | 1289 | buffer = packet; |
c6fcf0ba | 1290 | bufferlen = NETVSC_PACKET_SIZE; |
fceaf24a | 1291 | } |
21a80820 | 1292 | } else { |
454f18a9 | 1293 | /* reset */ |
c6fcf0ba | 1294 | if (bufferlen > NETVSC_PACKET_SIZE) { |
8c69f52a | 1295 | kfree(buffer); |
fceaf24a | 1296 | buffer = packet; |
c6fcf0ba | 1297 | bufferlen = NETVSC_PACKET_SIZE; |
fceaf24a HJ |
1298 | } |
1299 | ||
1300 | break; | |
1301 | } | |
21a80820 GKH |
1302 | } else if (ret == -2) { |
1303 | /* Handle large packet */ | |
85799a37 | 1304 | buffer = kmalloc(bytes_recvd, GFP_ATOMIC); |
21a80820 | 1305 | if (buffer == NULL) { |
454f18a9 | 1306 | /* Try again next time around */ |
21a80820 GKH |
1307 | DPRINT_ERR(NETVSC, |
1308 | "unable to allocate buffer of size " | |
85799a37 | 1309 | "(%d)!!", bytes_recvd); |
fceaf24a HJ |
1310 | break; |
1311 | } | |
1312 | ||
85799a37 | 1313 | bufferlen = bytes_recvd; |
fceaf24a HJ |
1314 | } |
1315 | } while (1); | |
1316 | ||
5a71ae30 | 1317 | put_net_device(device); |
c6fcf0ba BP |
1318 | out: |
1319 | kfree(buffer); | |
fceaf24a HJ |
1320 | return; |
1321 | } |