Commit | Line | Data |
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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 | |
adf8d3ff | 14 | * this program; if not, see <http://www.gnu.org/licenses/>. |
fceaf24a HJ |
15 | * |
16 | * Authors: | |
d0e94d17 | 17 | * Haiyang Zhang <haiyangz@microsoft.com> |
fceaf24a | 18 | * Hank Janssen <hjanssen@microsoft.com> |
fceaf24a | 19 | */ |
eb335bc4 HJ |
20 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
21 | ||
5654e932 | 22 | #include <linux/kernel.h> |
0c3b7b2f S |
23 | #include <linux/sched.h> |
24 | #include <linux/wait.h> | |
0ffa63b0 | 25 | #include <linux/mm.h> |
b4362c9c | 26 | #include <linux/delay.h> |
21a80820 | 27 | #include <linux/io.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
d9871158 | 29 | #include <linux/netdevice.h> |
f157e78d | 30 | #include <linux/if_ether.h> |
d6472302 | 31 | #include <linux/vmalloc.h> |
c25aaf81 | 32 | #include <asm/sync_bitops.h> |
3f335ea2 | 33 | |
5ca7252a | 34 | #include "hyperv_net.h" |
fceaf24a | 35 | |
30d1de08 SH |
36 | /* |
37 | * An API to support in-place processing of incoming VMBUS packets. | |
38 | */ | |
39 | #define VMBUS_PKT_TRAILER 8 | |
40 | ||
41 | static struct vmpacket_descriptor * | |
42 | get_next_pkt_raw(struct vmbus_channel *channel) | |
43 | { | |
44 | struct hv_ring_buffer_info *ring_info = &channel->inbound; | |
45 | u32 read_loc = ring_info->priv_read_index; | |
46 | void *ring_buffer = hv_get_ring_buffer(ring_info); | |
47 | struct vmpacket_descriptor *cur_desc; | |
48 | u32 packetlen; | |
49 | u32 dsize = ring_info->ring_datasize; | |
50 | u32 delta = read_loc - ring_info->ring_buffer->read_index; | |
51 | u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta); | |
52 | ||
53 | if (bytes_avail_toread < sizeof(struct vmpacket_descriptor)) | |
54 | return NULL; | |
55 | ||
56 | if ((read_loc + sizeof(*cur_desc)) > dsize) | |
57 | return NULL; | |
58 | ||
59 | cur_desc = ring_buffer + read_loc; | |
60 | packetlen = cur_desc->len8 << 3; | |
61 | ||
62 | /* | |
63 | * If the packet under consideration is wrapping around, | |
64 | * return failure. | |
65 | */ | |
66 | if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > (dsize - 1)) | |
67 | return NULL; | |
68 | ||
69 | return cur_desc; | |
70 | } | |
71 | ||
72 | /* | |
73 | * A helper function to step through packets "in-place" | |
74 | * This API is to be called after each successful call | |
75 | * get_next_pkt_raw(). | |
76 | */ | |
77 | static void put_pkt_raw(struct vmbus_channel *channel, | |
78 | struct vmpacket_descriptor *desc) | |
79 | { | |
80 | struct hv_ring_buffer_info *ring_info = &channel->inbound; | |
81 | u32 read_loc = ring_info->priv_read_index; | |
82 | u32 packetlen = desc->len8 << 3; | |
83 | u32 dsize = ring_info->ring_datasize; | |
84 | ||
85 | BUG_ON((read_loc + packetlen + VMBUS_PKT_TRAILER) > dsize); | |
86 | ||
87 | /* | |
88 | * Include the packet trailer. | |
89 | */ | |
90 | ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER; | |
91 | } | |
92 | ||
93 | /* | |
94 | * This call commits the read index and potentially signals the host. | |
95 | * Here is the pattern for using the "in-place" consumption APIs: | |
96 | * | |
97 | * while (get_next_pkt_raw() { | |
98 | * process the packet "in-place"; | |
99 | * put_pkt_raw(); | |
100 | * } | |
101 | * if (packets processed in place) | |
102 | * commit_rd_index(); | |
103 | */ | |
104 | static void commit_rd_index(struct vmbus_channel *channel) | |
105 | { | |
106 | struct hv_ring_buffer_info *ring_info = &channel->inbound; | |
107 | /* | |
108 | * Make sure all reads are done before we update the read index since | |
109 | * the writer may start writing to the read area once the read index | |
110 | * is updated. | |
111 | */ | |
112 | virt_rmb(); | |
113 | ring_info->ring_buffer->read_index = ring_info->priv_read_index; | |
114 | ||
115 | if (hv_need_to_signal_on_read(ring_info)) | |
116 | vmbus_set_event(channel); | |
117 | } | |
118 | ||
84bf9cef KS |
119 | /* |
120 | * Switch the data path from the synthetic interface to the VF | |
121 | * interface. | |
122 | */ | |
0a1275ca | 123 | void netvsc_switch_datapath(struct net_device *ndev, bool vf) |
84bf9cef | 124 | { |
3d541ac5 VK |
125 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
126 | struct hv_device *dev = net_device_ctx->device_ctx; | |
0a1275ca VK |
127 | struct netvsc_device *nv_dev = net_device_ctx->nvdev; |
128 | struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; | |
84bf9cef KS |
129 | |
130 | memset(init_pkt, 0, sizeof(struct nvsp_message)); | |
131 | init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; | |
132 | if (vf) | |
133 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
134 | NVSP_DATAPATH_VF; | |
135 | else | |
136 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
137 | NVSP_DATAPATH_SYNTHETIC; | |
138 | ||
139 | vmbus_sendpacket(dev->channel, init_pkt, | |
140 | sizeof(struct nvsp_message), | |
141 | (unsigned long)init_pkt, | |
142 | VM_PKT_DATA_INBAND, 0); | |
143 | } | |
144 | ||
88098834 | 145 | static struct netvsc_device *alloc_net_device(void) |
fceaf24a | 146 | { |
85799a37 | 147 | struct netvsc_device *net_device; |
fceaf24a | 148 | |
85799a37 HZ |
149 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
150 | if (!net_device) | |
fceaf24a HJ |
151 | return NULL; |
152 | ||
f90251c8 HZ |
153 | net_device->cb_buffer = kzalloc(NETVSC_PACKET_SIZE, GFP_KERNEL); |
154 | if (!net_device->cb_buffer) { | |
155 | kfree(net_device); | |
156 | return NULL; | |
157 | } | |
158 | ||
c0b558e5 HZ |
159 | net_device->mrc[0].buf = vzalloc(NETVSC_RECVSLOT_MAX * |
160 | sizeof(struct recv_comp_data)); | |
161 | ||
dc5cd894 | 162 | init_waitqueue_head(&net_device->wait_drain); |
c38b9c71 | 163 | net_device->destroy = false; |
84bf9cef | 164 | atomic_set(&net_device->open_cnt, 0); |
7c3877f2 HZ |
165 | net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; |
166 | net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; | |
167 | ||
85799a37 | 168 | return net_device; |
fceaf24a HJ |
169 | } |
170 | ||
f90251c8 HZ |
171 | static void free_netvsc_device(struct netvsc_device *nvdev) |
172 | { | |
c0b558e5 HZ |
173 | int i; |
174 | ||
175 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) | |
176 | vfree(nvdev->mrc[i].buf); | |
177 | ||
f90251c8 HZ |
178 | kfree(nvdev->cb_buffer); |
179 | kfree(nvdev); | |
180 | } | |
181 | ||
5a71ae30 | 182 | static struct netvsc_device *get_outbound_net_device(struct hv_device *device) |
fceaf24a | 183 | { |
2625466d | 184 | struct netvsc_device *net_device = hv_device_to_netvsc_device(device); |
fceaf24a | 185 | |
9d88f33a | 186 | if (net_device && net_device->destroy) |
85799a37 | 187 | net_device = NULL; |
fceaf24a | 188 | |
85799a37 | 189 | return net_device; |
fceaf24a HJ |
190 | } |
191 | ||
5a71ae30 | 192 | static struct netvsc_device *get_inbound_net_device(struct hv_device *device) |
fceaf24a | 193 | { |
2625466d | 194 | struct netvsc_device *net_device = hv_device_to_netvsc_device(device); |
9d88f33a S |
195 | |
196 | if (!net_device) | |
197 | goto get_in_err; | |
198 | ||
199 | if (net_device->destroy && | |
c0b558e5 HZ |
200 | atomic_read(&net_device->num_outstanding_sends) == 0 && |
201 | atomic_read(&net_device->num_outstanding_recvs) == 0) | |
85799a37 | 202 | net_device = NULL; |
fceaf24a | 203 | |
9d88f33a | 204 | get_in_err: |
85799a37 | 205 | return net_device; |
fceaf24a HJ |
206 | } |
207 | ||
3d541ac5 | 208 | static int netvsc_destroy_buf(struct hv_device *device) |
ec91cd09 HZ |
209 | { |
210 | struct nvsp_message *revoke_packet; | |
211 | int ret = 0; | |
3d541ac5 | 212 | struct net_device *ndev = hv_get_drvdata(device); |
2625466d | 213 | struct netvsc_device *net_device = net_device_to_netvsc_device(ndev); |
ec91cd09 HZ |
214 | |
215 | /* | |
216 | * If we got a section count, it means we received a | |
217 | * SendReceiveBufferComplete msg (ie sent | |
218 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
219 | * to send a revoke msg here | |
220 | */ | |
221 | if (net_device->recv_section_cnt) { | |
222 | /* Send the revoke receive buffer */ | |
223 | revoke_packet = &net_device->revoke_packet; | |
224 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
225 | ||
226 | revoke_packet->hdr.msg_type = | |
227 | NVSP_MSG1_TYPE_REVOKE_RECV_BUF; | |
228 | revoke_packet->msg.v1_msg. | |
229 | revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
230 | ||
3d541ac5 | 231 | ret = vmbus_sendpacket(device->channel, |
ec91cd09 HZ |
232 | revoke_packet, |
233 | sizeof(struct nvsp_message), | |
234 | (unsigned long)revoke_packet, | |
235 | VM_PKT_DATA_INBAND, 0); | |
236 | /* | |
237 | * If we failed here, we might as well return and | |
238 | * have a leak rather than continue and a bugchk | |
239 | */ | |
240 | if (ret != 0) { | |
d9871158 | 241 | netdev_err(ndev, "unable to send " |
c909ebbd | 242 | "revoke receive buffer to netvsp\n"); |
a3e00530 | 243 | return ret; |
ec91cd09 HZ |
244 | } |
245 | } | |
246 | ||
247 | /* Teardown the gpadl on the vsp end */ | |
248 | if (net_device->recv_buf_gpadl_handle) { | |
3d541ac5 VK |
249 | ret = vmbus_teardown_gpadl(device->channel, |
250 | net_device->recv_buf_gpadl_handle); | |
ec91cd09 HZ |
251 | |
252 | /* If we failed here, we might as well return and have a leak | |
253 | * rather than continue and a bugchk | |
254 | */ | |
255 | if (ret != 0) { | |
d9871158 | 256 | netdev_err(ndev, |
c909ebbd | 257 | "unable to teardown receive buffer's gpadl\n"); |
7f9615e6 | 258 | return ret; |
ec91cd09 HZ |
259 | } |
260 | net_device->recv_buf_gpadl_handle = 0; | |
261 | } | |
262 | ||
263 | if (net_device->recv_buf) { | |
264 | /* Free up the receive buffer */ | |
b679ef73 | 265 | vfree(net_device->recv_buf); |
ec91cd09 HZ |
266 | net_device->recv_buf = NULL; |
267 | } | |
268 | ||
269 | if (net_device->recv_section) { | |
270 | net_device->recv_section_cnt = 0; | |
271 | kfree(net_device->recv_section); | |
272 | net_device->recv_section = NULL; | |
273 | } | |
274 | ||
c25aaf81 KS |
275 | /* Deal with the send buffer we may have setup. |
276 | * If we got a send section size, it means we received a | |
c51ed182 HZ |
277 | * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent |
278 | * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need | |
c25aaf81 KS |
279 | * to send a revoke msg here |
280 | */ | |
281 | if (net_device->send_section_size) { | |
282 | /* Send the revoke receive buffer */ | |
283 | revoke_packet = &net_device->revoke_packet; | |
284 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
285 | ||
286 | revoke_packet->hdr.msg_type = | |
287 | NVSP_MSG1_TYPE_REVOKE_SEND_BUF; | |
c51ed182 HZ |
288 | revoke_packet->msg.v1_msg.revoke_send_buf.id = |
289 | NETVSC_SEND_BUFFER_ID; | |
c25aaf81 | 290 | |
3d541ac5 | 291 | ret = vmbus_sendpacket(device->channel, |
c25aaf81 KS |
292 | revoke_packet, |
293 | sizeof(struct nvsp_message), | |
294 | (unsigned long)revoke_packet, | |
295 | VM_PKT_DATA_INBAND, 0); | |
296 | /* If we failed here, we might as well return and | |
297 | * have a leak rather than continue and a bugchk | |
298 | */ | |
299 | if (ret != 0) { | |
300 | netdev_err(ndev, "unable to send " | |
301 | "revoke send buffer to netvsp\n"); | |
302 | return ret; | |
303 | } | |
304 | } | |
305 | /* Teardown the gpadl on the vsp end */ | |
306 | if (net_device->send_buf_gpadl_handle) { | |
3d541ac5 | 307 | ret = vmbus_teardown_gpadl(device->channel, |
c25aaf81 KS |
308 | net_device->send_buf_gpadl_handle); |
309 | ||
310 | /* If we failed here, we might as well return and have a leak | |
311 | * rather than continue and a bugchk | |
312 | */ | |
313 | if (ret != 0) { | |
314 | netdev_err(ndev, | |
315 | "unable to teardown send buffer's gpadl\n"); | |
316 | return ret; | |
317 | } | |
2f18423d | 318 | net_device->send_buf_gpadl_handle = 0; |
c25aaf81 KS |
319 | } |
320 | if (net_device->send_buf) { | |
c51ed182 | 321 | /* Free up the send buffer */ |
06b47aac | 322 | vfree(net_device->send_buf); |
c25aaf81 KS |
323 | net_device->send_buf = NULL; |
324 | } | |
325 | kfree(net_device->send_section_map); | |
326 | ||
ec91cd09 HZ |
327 | return ret; |
328 | } | |
329 | ||
c25aaf81 | 330 | static int netvsc_init_buf(struct hv_device *device) |
fceaf24a | 331 | { |
21a80820 | 332 | int ret = 0; |
85799a37 HZ |
333 | struct netvsc_device *net_device; |
334 | struct nvsp_message *init_packet; | |
2ddd5e5f | 335 | struct net_device *ndev; |
0a726c2b | 336 | int node; |
fceaf24a | 337 | |
5a71ae30 | 338 | net_device = get_outbound_net_device(device); |
2ddd5e5f | 339 | if (!net_device) |
927bc33c | 340 | return -ENODEV; |
0a1275ca | 341 | ndev = hv_get_drvdata(device); |
fceaf24a | 342 | |
0a726c2b S |
343 | node = cpu_to_node(device->channel->target_cpu); |
344 | net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); | |
345 | if (!net_device->recv_buf) | |
346 | net_device->recv_buf = vzalloc(net_device->recv_buf_size); | |
347 | ||
53d21fdb | 348 | if (!net_device->recv_buf) { |
d9871158 | 349 | netdev_err(ndev, "unable to allocate receive " |
c909ebbd | 350 | "buffer of size %d\n", net_device->recv_buf_size); |
927bc33c | 351 | ret = -ENOMEM; |
0c3b7b2f | 352 | goto cleanup; |
fceaf24a | 353 | } |
fceaf24a | 354 | |
454f18a9 BP |
355 | /* |
356 | * Establish the gpadl handle for this buffer on this | |
357 | * channel. Note: This call uses the vmbus connection rather | |
358 | * than the channel to establish the gpadl handle. | |
359 | */ | |
53d21fdb HZ |
360 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
361 | net_device->recv_buf_size, | |
362 | &net_device->recv_buf_gpadl_handle); | |
21a80820 | 363 | if (ret != 0) { |
d9871158 | 364 | netdev_err(ndev, |
c909ebbd | 365 | "unable to establish receive buffer's gpadl\n"); |
0c3b7b2f | 366 | goto cleanup; |
fceaf24a HJ |
367 | } |
368 | ||
454f18a9 | 369 | /* Notify the NetVsp of the gpadl handle */ |
53d21fdb | 370 | init_packet = &net_device->channel_init_pkt; |
fceaf24a | 371 | |
85799a37 | 372 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 373 | |
53d21fdb HZ |
374 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
375 | init_packet->msg.v1_msg.send_recv_buf. | |
376 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
377 | init_packet->msg.v1_msg. | |
378 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 379 | |
454f18a9 | 380 | /* Send the gpadl notification request */ |
85799a37 | 381 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 382 | sizeof(struct nvsp_message), |
85799a37 | 383 | (unsigned long)init_packet, |
415f2287 | 384 | VM_PKT_DATA_INBAND, |
5a4df290 | 385 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 386 | if (ret != 0) { |
d9871158 | 387 | netdev_err(ndev, |
c909ebbd | 388 | "unable to send receive buffer's gpadl to netvsp\n"); |
0c3b7b2f | 389 | goto cleanup; |
fceaf24a HJ |
390 | } |
391 | ||
5362855a | 392 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 393 | |
454f18a9 | 394 | /* Check the response */ |
53d21fdb HZ |
395 | if (init_packet->msg.v1_msg. |
396 | send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { | |
d9871158 | 397 | netdev_err(ndev, "Unable to complete receive buffer " |
8bff33ab | 398 | "initialization with NetVsp - status %d\n", |
53d21fdb HZ |
399 | init_packet->msg.v1_msg. |
400 | send_recv_buf_complete.status); | |
927bc33c | 401 | ret = -EINVAL; |
0c3b7b2f | 402 | goto cleanup; |
fceaf24a HJ |
403 | } |
404 | ||
454f18a9 | 405 | /* Parse the response */ |
fceaf24a | 406 | |
53d21fdb HZ |
407 | net_device->recv_section_cnt = init_packet->msg. |
408 | v1_msg.send_recv_buf_complete.num_sections; | |
fceaf24a | 409 | |
c1813200 HZ |
410 | net_device->recv_section = kmemdup( |
411 | init_packet->msg.v1_msg.send_recv_buf_complete.sections, | |
412 | net_device->recv_section_cnt * | |
413 | sizeof(struct nvsp_1_receive_buffer_section), | |
414 | GFP_KERNEL); | |
53d21fdb | 415 | if (net_device->recv_section == NULL) { |
927bc33c | 416 | ret = -EINVAL; |
0c3b7b2f | 417 | goto cleanup; |
fceaf24a HJ |
418 | } |
419 | ||
21a80820 GKH |
420 | /* |
421 | * For 1st release, there should only be 1 section that represents the | |
422 | * entire receive buffer | |
423 | */ | |
53d21fdb HZ |
424 | if (net_device->recv_section_cnt != 1 || |
425 | net_device->recv_section->offset != 0) { | |
927bc33c | 426 | ret = -EINVAL; |
0c3b7b2f | 427 | goto cleanup; |
fceaf24a HJ |
428 | } |
429 | ||
c25aaf81 KS |
430 | /* Now setup the send buffer. |
431 | */ | |
5defde59 S |
432 | net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); |
433 | if (!net_device->send_buf) | |
434 | net_device->send_buf = vzalloc(net_device->send_buf_size); | |
c25aaf81 KS |
435 | if (!net_device->send_buf) { |
436 | netdev_err(ndev, "unable to allocate send " | |
437 | "buffer of size %d\n", net_device->send_buf_size); | |
438 | ret = -ENOMEM; | |
439 | goto cleanup; | |
440 | } | |
441 | ||
442 | /* Establish the gpadl handle for this buffer on this | |
443 | * channel. Note: This call uses the vmbus connection rather | |
444 | * than the channel to establish the gpadl handle. | |
445 | */ | |
446 | ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, | |
447 | net_device->send_buf_size, | |
448 | &net_device->send_buf_gpadl_handle); | |
449 | if (ret != 0) { | |
450 | netdev_err(ndev, | |
451 | "unable to establish send buffer's gpadl\n"); | |
452 | goto cleanup; | |
453 | } | |
454 | ||
455 | /* Notify the NetVsp of the gpadl handle */ | |
456 | init_packet = &net_device->channel_init_pkt; | |
457 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
458 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; | |
c51ed182 | 459 | init_packet->msg.v1_msg.send_send_buf.gpadl_handle = |
c25aaf81 | 460 | net_device->send_buf_gpadl_handle; |
c51ed182 | 461 | init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; |
c25aaf81 KS |
462 | |
463 | /* Send the gpadl notification request */ | |
464 | ret = vmbus_sendpacket(device->channel, init_packet, | |
465 | sizeof(struct nvsp_message), | |
466 | (unsigned long)init_packet, | |
467 | VM_PKT_DATA_INBAND, | |
468 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
469 | if (ret != 0) { | |
470 | netdev_err(ndev, | |
471 | "unable to send send buffer's gpadl to netvsp\n"); | |
472 | goto cleanup; | |
473 | } | |
474 | ||
5362855a | 475 | wait_for_completion(&net_device->channel_init_wait); |
c25aaf81 KS |
476 | |
477 | /* Check the response */ | |
478 | if (init_packet->msg.v1_msg. | |
479 | send_send_buf_complete.status != NVSP_STAT_SUCCESS) { | |
480 | netdev_err(ndev, "Unable to complete send buffer " | |
481 | "initialization with NetVsp - status %d\n", | |
482 | init_packet->msg.v1_msg. | |
c51ed182 | 483 | send_send_buf_complete.status); |
c25aaf81 KS |
484 | ret = -EINVAL; |
485 | goto cleanup; | |
486 | } | |
487 | ||
488 | /* Parse the response */ | |
489 | net_device->send_section_size = init_packet->msg. | |
490 | v1_msg.send_send_buf_complete.section_size; | |
491 | ||
492 | /* Section count is simply the size divided by the section size. | |
493 | */ | |
494 | net_device->send_section_cnt = | |
796cc88c | 495 | net_device->send_buf_size / net_device->send_section_size; |
c25aaf81 KS |
496 | |
497 | dev_info(&device->device, "Send section size: %d, Section count:%d\n", | |
498 | net_device->send_section_size, net_device->send_section_cnt); | |
499 | ||
500 | /* Setup state for managing the send buffer. */ | |
501 | net_device->map_words = DIV_ROUND_UP(net_device->send_section_cnt, | |
502 | BITS_PER_LONG); | |
503 | ||
e53a9c2a SH |
504 | net_device->send_section_map = kcalloc(net_device->map_words, |
505 | sizeof(ulong), GFP_KERNEL); | |
dd1d3f8f WY |
506 | if (net_device->send_section_map == NULL) { |
507 | ret = -ENOMEM; | |
c25aaf81 | 508 | goto cleanup; |
dd1d3f8f | 509 | } |
c25aaf81 | 510 | |
0c3b7b2f | 511 | goto exit; |
fceaf24a | 512 | |
0c3b7b2f | 513 | cleanup: |
3d541ac5 | 514 | netvsc_destroy_buf(device); |
fceaf24a | 515 | |
0c3b7b2f | 516 | exit: |
fceaf24a HJ |
517 | return ret; |
518 | } | |
519 | ||
f157e78d HZ |
520 | /* Negotiate NVSP protocol version */ |
521 | static int negotiate_nvsp_ver(struct hv_device *device, | |
522 | struct netvsc_device *net_device, | |
523 | struct nvsp_message *init_packet, | |
524 | u32 nvsp_ver) | |
fceaf24a | 525 | { |
0a1275ca | 526 | struct net_device *ndev = hv_get_drvdata(device); |
7390fe9c | 527 | int ret; |
fceaf24a | 528 | |
85799a37 | 529 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb | 530 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
f157e78d HZ |
531 | init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; |
532 | init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; | |
fceaf24a | 533 | |
454f18a9 | 534 | /* Send the init request */ |
85799a37 | 535 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 536 | sizeof(struct nvsp_message), |
85799a37 | 537 | (unsigned long)init_packet, |
415f2287 | 538 | VM_PKT_DATA_INBAND, |
5a4df290 | 539 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 540 | |
b8a3d52b | 541 | if (ret != 0) |
f157e78d | 542 | return ret; |
fceaf24a | 543 | |
5362855a | 544 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 545 | |
53d21fdb | 546 | if (init_packet->msg.init_msg.init_complete.status != |
f157e78d HZ |
547 | NVSP_STAT_SUCCESS) |
548 | return -EINVAL; | |
fceaf24a | 549 | |
a1eabb01 | 550 | if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
f157e78d HZ |
551 | return 0; |
552 | ||
71790a27 | 553 | /* NVSPv2 or later: Send NDIS config */ |
f157e78d HZ |
554 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
555 | init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; | |
0a1275ca | 556 | init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; |
1f5f3a75 | 557 | init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
f157e78d | 558 | |
7f5d5af0 | 559 | if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { |
71790a27 HZ |
560 | init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; |
561 | ||
7f5d5af0 HZ |
562 | /* Teaming bit is needed to receive link speed updates */ |
563 | init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; | |
564 | } | |
565 | ||
f157e78d HZ |
566 | ret = vmbus_sendpacket(device->channel, init_packet, |
567 | sizeof(struct nvsp_message), | |
568 | (unsigned long)init_packet, | |
569 | VM_PKT_DATA_INBAND, 0); | |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
574 | static int netvsc_connect_vsp(struct hv_device *device) | |
575 | { | |
576 | int ret; | |
577 | struct netvsc_device *net_device; | |
578 | struct nvsp_message *init_packet; | |
579 | int ndis_version; | |
a1eabb01 HZ |
580 | u32 ver_list[] = { NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, |
581 | NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 }; | |
582 | int i, num_ver = 4; /* number of different NVSP versions */ | |
f157e78d HZ |
583 | |
584 | net_device = get_outbound_net_device(device); | |
585 | if (!net_device) | |
586 | return -ENODEV; | |
f157e78d HZ |
587 | |
588 | init_packet = &net_device->channel_init_pkt; | |
589 | ||
590 | /* Negotiate the latest NVSP protocol supported */ | |
a1eabb01 HZ |
591 | for (i = num_ver - 1; i >= 0; i--) |
592 | if (negotiate_nvsp_ver(device, net_device, init_packet, | |
593 | ver_list[i]) == 0) { | |
594 | net_device->nvsp_version = ver_list[i]; | |
595 | break; | |
596 | } | |
597 | ||
598 | if (i < 0) { | |
0f48c72c | 599 | ret = -EPROTO; |
0c3b7b2f | 600 | goto cleanup; |
fceaf24a | 601 | } |
f157e78d HZ |
602 | |
603 | pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); | |
604 | ||
454f18a9 | 605 | /* Send the ndis version */ |
85799a37 | 606 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 607 | |
a1eabb01 | 608 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) |
1f73db49 | 609 | ndis_version = 0x00060001; |
a1eabb01 HZ |
610 | else |
611 | ndis_version = 0x0006001e; | |
fceaf24a | 612 | |
53d21fdb HZ |
613 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
614 | init_packet->msg.v1_msg. | |
615 | send_ndis_ver.ndis_major_ver = | |
85799a37 | 616 | (ndis_version & 0xFFFF0000) >> 16; |
53d21fdb HZ |
617 | init_packet->msg.v1_msg. |
618 | send_ndis_ver.ndis_minor_ver = | |
85799a37 | 619 | ndis_version & 0xFFFF; |
fceaf24a | 620 | |
454f18a9 | 621 | /* Send the init request */ |
85799a37 | 622 | ret = vmbus_sendpacket(device->channel, init_packet, |
0c3b7b2f S |
623 | sizeof(struct nvsp_message), |
624 | (unsigned long)init_packet, | |
625 | VM_PKT_DATA_INBAND, 0); | |
0f48c72c | 626 | if (ret != 0) |
0c3b7b2f | 627 | goto cleanup; |
454f18a9 BP |
628 | |
629 | /* Post the big receive buffer to NetVSP */ | |
99d3016d HZ |
630 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) |
631 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; | |
632 | else | |
633 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; | |
c25aaf81 | 634 | net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; |
99d3016d | 635 | |
c25aaf81 | 636 | ret = netvsc_init_buf(device); |
fceaf24a | 637 | |
0c3b7b2f | 638 | cleanup: |
fceaf24a HJ |
639 | return ret; |
640 | } | |
641 | ||
3d541ac5 | 642 | static void netvsc_disconnect_vsp(struct hv_device *device) |
fceaf24a | 643 | { |
3d541ac5 | 644 | netvsc_destroy_buf(device); |
fceaf24a HJ |
645 | } |
646 | ||
3e189519 | 647 | /* |
5a71ae30 | 648 | * netvsc_device_remove - Callback when the root bus device is removed |
21a80820 | 649 | */ |
905620d1 | 650 | int netvsc_device_remove(struct hv_device *device) |
fceaf24a | 651 | { |
3d541ac5 VK |
652 | struct net_device *ndev = hv_get_drvdata(device); |
653 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
654 | struct netvsc_device *net_device = net_device_ctx->nvdev; | |
fceaf24a | 655 | |
3d541ac5 | 656 | netvsc_disconnect_vsp(device); |
9d88f33a | 657 | |
3d541ac5 | 658 | net_device_ctx->nvdev = NULL; |
3852409b | 659 | |
86c921af S |
660 | /* |
661 | * At this point, no one should be accessing net_device | |
662 | * except in here | |
663 | */ | |
c909ebbd | 664 | dev_notice(&device->device, "net device safe to remove\n"); |
fceaf24a | 665 | |
454f18a9 | 666 | /* Now, we can close the channel safely */ |
85799a37 | 667 | vmbus_close(device->channel); |
fceaf24a | 668 | |
454f18a9 | 669 | /* Release all resources */ |
aa99c479 | 670 | vfree(net_device->sub_cb_buf); |
f90251c8 | 671 | free_netvsc_device(net_device); |
21a80820 | 672 | return 0; |
fceaf24a HJ |
673 | } |
674 | ||
33be96e4 HZ |
675 | #define RING_AVAIL_PERCENT_HIWATER 20 |
676 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
677 | ||
678 | /* | |
679 | * Get the percentage of available bytes to write in the ring. | |
680 | * The return value is in range from 0 to 100. | |
681 | */ | |
682 | static inline u32 hv_ringbuf_avail_percent( | |
683 | struct hv_ring_buffer_info *ring_info) | |
684 | { | |
685 | u32 avail_read, avail_write; | |
686 | ||
687 | hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); | |
688 | ||
689 | return avail_write * 100 / ring_info->ring_datasize; | |
690 | } | |
691 | ||
c25aaf81 KS |
692 | static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
693 | u32 index) | |
694 | { | |
695 | sync_change_bit(index, net_device->send_section_map); | |
696 | } | |
697 | ||
97c1723a | 698 | static void netvsc_send_completion(struct netvsc_device *net_device, |
25b85ee8 | 699 | struct vmbus_channel *incoming_channel, |
97c1723a | 700 | struct hv_device *device, |
85799a37 | 701 | struct vmpacket_descriptor *packet) |
fceaf24a | 702 | { |
85799a37 HZ |
703 | struct nvsp_message *nvsp_packet; |
704 | struct hv_netvsc_packet *nvsc_packet; | |
3d541ac5 VK |
705 | struct net_device *ndev = hv_get_drvdata(device); |
706 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
c25aaf81 | 707 | u32 send_index; |
3a3d9a0a | 708 | struct sk_buff *skb; |
fceaf24a | 709 | |
85799a37 | 710 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
415f2287 | 711 | (packet->offset8 << 3)); |
fceaf24a | 712 | |
53d21fdb HZ |
713 | if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) || |
714 | (nvsp_packet->hdr.msg_type == | |
715 | NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) || | |
716 | (nvsp_packet->hdr.msg_type == | |
5b54dac8 HZ |
717 | NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE) || |
718 | (nvsp_packet->hdr.msg_type == | |
719 | NVSP_MSG5_TYPE_SUBCHANNEL)) { | |
454f18a9 | 720 | /* Copy the response back */ |
53d21fdb | 721 | memcpy(&net_device->channel_init_pkt, nvsp_packet, |
21a80820 | 722 | sizeof(struct nvsp_message)); |
35abb21a | 723 | complete(&net_device->channel_init_wait); |
53d21fdb HZ |
724 | } else if (nvsp_packet->hdr.msg_type == |
725 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) { | |
33be96e4 | 726 | int num_outstanding_sends; |
5b54dac8 HZ |
727 | u16 q_idx = 0; |
728 | struct vmbus_channel *channel = device->channel; | |
729 | int queue_sends; | |
33be96e4 | 730 | |
454f18a9 | 731 | /* Get the send context */ |
3a3d9a0a | 732 | skb = (struct sk_buff *)(unsigned long)packet->trans_id; |
fceaf24a | 733 | |
454f18a9 | 734 | /* Notify the layer above us */ |
3a3d9a0a KS |
735 | if (skb) { |
736 | nvsc_packet = (struct hv_netvsc_packet *) skb->cb; | |
c25aaf81 KS |
737 | send_index = nvsc_packet->send_buf_index; |
738 | if (send_index != NETVSC_INVALID_INDEX) | |
739 | netvsc_free_send_slot(net_device, send_index); | |
5b54dac8 | 740 | q_idx = nvsc_packet->q_idx; |
25b85ee8 | 741 | channel = incoming_channel; |
3a3d9a0a | 742 | dev_kfree_skb_any(skb); |
5b54dac8 | 743 | } |
fceaf24a | 744 | |
33be96e4 HZ |
745 | num_outstanding_sends = |
746 | atomic_dec_return(&net_device->num_outstanding_sends); | |
5b54dac8 HZ |
747 | queue_sends = atomic_dec_return(&net_device-> |
748 | queue_sends[q_idx]); | |
1d06825b | 749 | |
dc5cd894 HZ |
750 | if (net_device->destroy && num_outstanding_sends == 0) |
751 | wake_up(&net_device->wait_drain); | |
752 | ||
5b54dac8 | 753 | if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && |
3d541ac5 | 754 | !net_device_ctx->start_remove && |
5b54dac8 HZ |
755 | (hv_ringbuf_avail_percent(&channel->outbound) > |
756 | RING_AVAIL_PERCENT_HIWATER || queue_sends < 1)) | |
796cc88c | 757 | netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx)); |
21a80820 | 758 | } else { |
d9871158 | 759 | netdev_err(ndev, "Unknown send completion packet type- " |
c909ebbd | 760 | "%d received!!\n", nvsp_packet->hdr.msg_type); |
fceaf24a | 761 | } |
fceaf24a HJ |
762 | } |
763 | ||
c25aaf81 KS |
764 | static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
765 | { | |
766 | unsigned long index; | |
767 | u32 max_words = net_device->map_words; | |
768 | unsigned long *map_addr = (unsigned long *)net_device->send_section_map; | |
769 | u32 section_cnt = net_device->send_section_cnt; | |
770 | int ret_val = NETVSC_INVALID_INDEX; | |
771 | int i; | |
772 | int prev_val; | |
773 | ||
774 | for (i = 0; i < max_words; i++) { | |
775 | if (!~(map_addr[i])) | |
776 | continue; | |
777 | index = ffz(map_addr[i]); | |
778 | prev_val = sync_test_and_set_bit(index, &map_addr[i]); | |
779 | if (prev_val) | |
780 | continue; | |
781 | if ((index + (i * BITS_PER_LONG)) >= section_cnt) | |
782 | break; | |
783 | ret_val = (index + (i * BITS_PER_LONG)); | |
784 | break; | |
785 | } | |
786 | return ret_val; | |
787 | } | |
788 | ||
da19fcd0 LP |
789 | static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
790 | unsigned int section_index, | |
7c3877f2 | 791 | u32 pend_size, |
24476760 | 792 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 793 | struct rndis_message *rndis_msg, |
694a9fb0 KS |
794 | struct hv_page_buffer **pb, |
795 | struct sk_buff *skb) | |
c25aaf81 KS |
796 | { |
797 | char *start = net_device->send_buf; | |
7c3877f2 HZ |
798 | char *dest = start + (section_index * net_device->send_section_size) |
799 | + pend_size; | |
c25aaf81 | 800 | int i; |
694a9fb0 | 801 | bool is_data_pkt = (skb != NULL) ? true : false; |
bde79be5 | 802 | bool xmit_more = (skb != NULL) ? skb->xmit_more : false; |
c25aaf81 | 803 | u32 msg_size = 0; |
7c3877f2 HZ |
804 | u32 padding = 0; |
805 | u32 remain = packet->total_data_buflen % net_device->pkt_align; | |
aa0a34be HZ |
806 | u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : |
807 | packet->page_buf_cnt; | |
7c3877f2 HZ |
808 | |
809 | /* Add padding */ | |
bde79be5 | 810 | if (is_data_pkt && xmit_more && remain && |
aa0a34be | 811 | !packet->cp_partial) { |
7c3877f2 | 812 | padding = net_device->pkt_align - remain; |
24476760 | 813 | rndis_msg->msg_len += padding; |
7c3877f2 HZ |
814 | packet->total_data_buflen += padding; |
815 | } | |
c25aaf81 | 816 | |
aa0a34be | 817 | for (i = 0; i < page_count; i++) { |
a9f2e2d6 KS |
818 | char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT); |
819 | u32 offset = (*pb)[i].offset; | |
820 | u32 len = (*pb)[i].len; | |
c25aaf81 KS |
821 | |
822 | memcpy(dest, (src + offset), len); | |
823 | msg_size += len; | |
824 | dest += len; | |
825 | } | |
7c3877f2 HZ |
826 | |
827 | if (padding) { | |
828 | memset(dest, 0, padding); | |
829 | msg_size += padding; | |
830 | } | |
831 | ||
c25aaf81 KS |
832 | return msg_size; |
833 | } | |
834 | ||
30d1de08 | 835 | static int netvsc_send_pkt( |
0a1275ca | 836 | struct hv_device *device, |
7c3877f2 | 837 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 838 | struct netvsc_device *net_device, |
3a3d9a0a KS |
839 | struct hv_page_buffer **pb, |
840 | struct sk_buff *skb) | |
fceaf24a | 841 | { |
7c3877f2 | 842 | struct nvsp_message nvmsg; |
3a67c9cc | 843 | u16 q_idx = packet->q_idx; |
8b9fbe1a | 844 | struct vmbus_channel *out_channel = net_device->chn_table[q_idx]; |
0a1275ca | 845 | struct net_device *ndev = hv_get_drvdata(device); |
7c3877f2 HZ |
846 | u64 req_id; |
847 | int ret; | |
aa0a34be | 848 | struct hv_page_buffer *pgbuf; |
82fa3c77 | 849 | u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); |
bde79be5 | 850 | bool xmit_more = (skb != NULL) ? skb->xmit_more : false; |
c25aaf81 | 851 | |
7c3877f2 | 852 | nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
694a9fb0 | 853 | if (skb != NULL) { |
21a80820 | 854 | /* 0 is RMC_DATA; */ |
7c3877f2 | 855 | nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; |
21a80820 GKH |
856 | } else { |
857 | /* 1 is RMC_CONTROL; */ | |
7c3877f2 | 858 | nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; |
21a80820 | 859 | } |
fceaf24a | 860 | |
7c3877f2 HZ |
861 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = |
862 | packet->send_buf_index; | |
863 | if (packet->send_buf_index == NETVSC_INVALID_INDEX) | |
864 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; | |
865 | else | |
866 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = | |
867 | packet->total_data_buflen; | |
21a80820 | 868 | |
3a3d9a0a | 869 | req_id = (ulong)skb; |
f1ea3cd7 | 870 | |
c3582a2c HZ |
871 | if (out_channel->rescind) |
872 | return -ENODEV; | |
873 | ||
82fa3c77 KS |
874 | /* |
875 | * It is possible that once we successfully place this packet | |
876 | * on the ringbuffer, we may stop the queue. In that case, we want | |
877 | * to notify the host independent of the xmit_more flag. We don't | |
878 | * need to be precise here; in the worst case we may signal the host | |
879 | * unnecessarily. | |
880 | */ | |
881 | if (ring_avail < (RING_AVAIL_PERCENT_LOWATER + 1)) | |
bde79be5 | 882 | xmit_more = false; |
82fa3c77 | 883 | |
72a2f5bd | 884 | if (packet->page_buf_cnt) { |
a9f2e2d6 KS |
885 | pgbuf = packet->cp_partial ? (*pb) + |
886 | packet->rmsg_pgcnt : (*pb); | |
82fa3c77 KS |
887 | ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, |
888 | pgbuf, | |
889 | packet->page_buf_cnt, | |
890 | &nvmsg, | |
891 | sizeof(struct nvsp_message), | |
892 | req_id, | |
893 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, | |
bde79be5 | 894 | !xmit_more); |
21a80820 | 895 | } else { |
82fa3c77 KS |
896 | ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, |
897 | sizeof(struct nvsp_message), | |
898 | req_id, | |
899 | VM_PKT_DATA_INBAND, | |
900 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED, | |
bde79be5 | 901 | !xmit_more); |
fceaf24a HJ |
902 | } |
903 | ||
1d06825b HZ |
904 | if (ret == 0) { |
905 | atomic_inc(&net_device->num_outstanding_sends); | |
3a67c9cc | 906 | atomic_inc(&net_device->queue_sends[q_idx]); |
5b54dac8 | 907 | |
82fa3c77 KS |
908 | if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { |
909 | netif_tx_stop_queue(netdev_get_tx_queue(ndev, q_idx)); | |
5b54dac8 | 910 | |
33be96e4 | 911 | if (atomic_read(&net_device-> |
3a67c9cc | 912 | queue_sends[q_idx]) < 1) |
5b54dac8 | 913 | netif_tx_wake_queue(netdev_get_tx_queue( |
3a67c9cc | 914 | ndev, q_idx)); |
33be96e4 | 915 | } |
1d06825b | 916 | } else if (ret == -EAGAIN) { |
5b54dac8 | 917 | netif_tx_stop_queue(netdev_get_tx_queue( |
3a67c9cc KS |
918 | ndev, q_idx)); |
919 | if (atomic_read(&net_device->queue_sends[q_idx]) < 1) { | |
5b54dac8 | 920 | netif_tx_wake_queue(netdev_get_tx_queue( |
3a67c9cc | 921 | ndev, q_idx)); |
33be96e4 HZ |
922 | ret = -ENOSPC; |
923 | } | |
1d06825b | 924 | } else { |
d9871158 | 925 | netdev_err(ndev, "Unable to send packet %p ret %d\n", |
85799a37 | 926 | packet, ret); |
1d06825b | 927 | } |
fceaf24a | 928 | |
7c3877f2 HZ |
929 | return ret; |
930 | } | |
931 | ||
c85e4924 HZ |
932 | /* Move packet out of multi send data (msd), and clear msd */ |
933 | static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, | |
934 | struct sk_buff **msd_skb, | |
935 | struct multi_send_data *msdp) | |
936 | { | |
937 | *msd_skb = msdp->skb; | |
938 | *msd_send = msdp->pkt; | |
939 | msdp->skb = NULL; | |
940 | msdp->pkt = NULL; | |
941 | msdp->count = 0; | |
942 | } | |
943 | ||
7c3877f2 | 944 | int netvsc_send(struct hv_device *device, |
24476760 | 945 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 946 | struct rndis_message *rndis_msg, |
3a3d9a0a KS |
947 | struct hv_page_buffer **pb, |
948 | struct sk_buff *skb) | |
7c3877f2 HZ |
949 | { |
950 | struct netvsc_device *net_device; | |
951 | int ret = 0, m_ret = 0; | |
952 | struct vmbus_channel *out_channel; | |
953 | u16 q_idx = packet->q_idx; | |
954 | u32 pktlen = packet->total_data_buflen, msd_len = 0; | |
955 | unsigned int section_index = NETVSC_INVALID_INDEX; | |
7c3877f2 HZ |
956 | struct multi_send_data *msdp; |
957 | struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; | |
c85e4924 | 958 | struct sk_buff *msd_skb = NULL; |
aa0a34be | 959 | bool try_batch; |
bde79be5 | 960 | bool xmit_more = (skb != NULL) ? skb->xmit_more : false; |
7c3877f2 HZ |
961 | |
962 | net_device = get_outbound_net_device(device); | |
963 | if (!net_device) | |
964 | return -ENODEV; | |
965 | ||
8b9fbe1a | 966 | out_channel = net_device->chn_table[q_idx]; |
25b85ee8 | 967 | |
7c3877f2 | 968 | packet->send_buf_index = NETVSC_INVALID_INDEX; |
aa0a34be | 969 | packet->cp_partial = false; |
7c3877f2 | 970 | |
cf8190e4 HZ |
971 | /* Send control message directly without accessing msd (Multi-Send |
972 | * Data) field which may be changed during data packet processing. | |
973 | */ | |
974 | if (!skb) { | |
975 | cur_send = packet; | |
976 | goto send_now; | |
977 | } | |
978 | ||
7c3877f2 HZ |
979 | msdp = &net_device->msd[q_idx]; |
980 | ||
981 | /* batch packets in send buffer if possible */ | |
7c3877f2 HZ |
982 | if (msdp->pkt) |
983 | msd_len = msdp->pkt->total_data_buflen; | |
984 | ||
694a9fb0 | 985 | try_batch = (skb != NULL) && msd_len > 0 && msdp->count < |
aa0a34be HZ |
986 | net_device->max_pkt; |
987 | ||
988 | if (try_batch && msd_len + pktlen + net_device->pkt_align < | |
7c3877f2 HZ |
989 | net_device->send_section_size) { |
990 | section_index = msdp->pkt->send_buf_index; | |
991 | ||
aa0a34be HZ |
992 | } else if (try_batch && msd_len + packet->rmsg_size < |
993 | net_device->send_section_size) { | |
994 | section_index = msdp->pkt->send_buf_index; | |
995 | packet->cp_partial = true; | |
996 | ||
694a9fb0 | 997 | } else if ((skb != NULL) && pktlen + net_device->pkt_align < |
7c3877f2 HZ |
998 | net_device->send_section_size) { |
999 | section_index = netvsc_get_next_send_section(net_device); | |
1000 | if (section_index != NETVSC_INVALID_INDEX) { | |
c85e4924 HZ |
1001 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
1002 | msd_len = 0; | |
7c3877f2 HZ |
1003 | } |
1004 | } | |
1005 | ||
1006 | if (section_index != NETVSC_INVALID_INDEX) { | |
1007 | netvsc_copy_to_send_buf(net_device, | |
1008 | section_index, msd_len, | |
694a9fb0 | 1009 | packet, rndis_msg, pb, skb); |
b08cc791 | 1010 | |
7c3877f2 | 1011 | packet->send_buf_index = section_index; |
aa0a34be HZ |
1012 | |
1013 | if (packet->cp_partial) { | |
1014 | packet->page_buf_cnt -= packet->rmsg_pgcnt; | |
1015 | packet->total_data_buflen = msd_len + packet->rmsg_size; | |
1016 | } else { | |
1017 | packet->page_buf_cnt = 0; | |
1018 | packet->total_data_buflen += msd_len; | |
aa0a34be | 1019 | } |
7c3877f2 | 1020 | |
c85e4924 HZ |
1021 | if (msdp->skb) |
1022 | dev_kfree_skb_any(msdp->skb); | |
ee90b812 | 1023 | |
bde79be5 | 1024 | if (xmit_more && !packet->cp_partial) { |
c85e4924 | 1025 | msdp->skb = skb; |
7c3877f2 HZ |
1026 | msdp->pkt = packet; |
1027 | msdp->count++; | |
1028 | } else { | |
1029 | cur_send = packet; | |
c85e4924 | 1030 | msdp->skb = NULL; |
7c3877f2 HZ |
1031 | msdp->pkt = NULL; |
1032 | msdp->count = 0; | |
1033 | } | |
1034 | } else { | |
c85e4924 | 1035 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
7c3877f2 HZ |
1036 | cur_send = packet; |
1037 | } | |
1038 | ||
7c3877f2 | 1039 | if (msd_send) { |
0a1275ca VK |
1040 | m_ret = netvsc_send_pkt(device, msd_send, net_device, |
1041 | NULL, msd_skb); | |
7c3877f2 HZ |
1042 | |
1043 | if (m_ret != 0) { | |
1044 | netvsc_free_send_slot(net_device, | |
1045 | msd_send->send_buf_index); | |
c85e4924 | 1046 | dev_kfree_skb_any(msd_skb); |
7c3877f2 HZ |
1047 | } |
1048 | } | |
1049 | ||
cf8190e4 | 1050 | send_now: |
7c3877f2 | 1051 | if (cur_send) |
0a1275ca | 1052 | ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); |
7c3877f2 | 1053 | |
7aab5159 JS |
1054 | if (ret != 0 && section_index != NETVSC_INVALID_INDEX) |
1055 | netvsc_free_send_slot(net_device, section_index); | |
d953ca4d | 1056 | |
fceaf24a HJ |
1057 | return ret; |
1058 | } | |
1059 | ||
c0b558e5 HZ |
1060 | static int netvsc_send_recv_completion(struct vmbus_channel *channel, |
1061 | u64 transaction_id, u32 status) | |
5fa9d3c5 HZ |
1062 | { |
1063 | struct nvsp_message recvcompMessage; | |
5fa9d3c5 HZ |
1064 | int ret; |
1065 | ||
1066 | recvcompMessage.hdr.msg_type = | |
1067 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; | |
1068 | ||
63f6921d | 1069 | recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; |
5fa9d3c5 | 1070 | |
5fa9d3c5 | 1071 | /* Send the completion */ |
5b54dac8 | 1072 | ret = vmbus_sendpacket(channel, &recvcompMessage, |
c0b558e5 HZ |
1073 | sizeof(struct nvsp_message_header) + sizeof(u32), |
1074 | transaction_id, VM_PKT_COMP, 0); | |
1075 | ||
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx, | |
1080 | u32 *filled, u32 *avail) | |
1081 | { | |
1082 | u32 first = nvdev->mrc[q_idx].first; | |
1083 | u32 next = nvdev->mrc[q_idx].next; | |
1084 | ||
1085 | *filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next : | |
1086 | next - first; | |
1087 | ||
1088 | *avail = NETVSC_RECVSLOT_MAX - *filled - 1; | |
1089 | } | |
1090 | ||
1091 | /* Read the first filled slot, no change to index */ | |
1092 | static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device | |
1093 | *nvdev, u16 q_idx) | |
1094 | { | |
1095 | u32 filled, avail; | |
1096 | ||
1097 | if (!nvdev->mrc[q_idx].buf) | |
1098 | return NULL; | |
1099 | ||
1100 | count_recv_comp_slot(nvdev, q_idx, &filled, &avail); | |
1101 | if (!filled) | |
1102 | return NULL; | |
1103 | ||
1104 | return nvdev->mrc[q_idx].buf + nvdev->mrc[q_idx].first * | |
1105 | sizeof(struct recv_comp_data); | |
1106 | } | |
1107 | ||
1108 | /* Put the first filled slot back to available pool */ | |
1109 | static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx) | |
1110 | { | |
1111 | int num_recv; | |
1112 | ||
1113 | nvdev->mrc[q_idx].first = (nvdev->mrc[q_idx].first + 1) % | |
1114 | NETVSC_RECVSLOT_MAX; | |
1115 | ||
1116 | num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs); | |
1117 | ||
1118 | if (nvdev->destroy && num_recv == 0) | |
1119 | wake_up(&nvdev->wait_drain); | |
1120 | } | |
1121 | ||
1122 | /* Check and send pending recv completions */ | |
1123 | static void netvsc_chk_recv_comp(struct netvsc_device *nvdev, | |
1124 | struct vmbus_channel *channel, u16 q_idx) | |
1125 | { | |
1126 | struct recv_comp_data *rcd; | |
1127 | int ret; | |
1128 | ||
1129 | while (true) { | |
1130 | rcd = read_recv_comp_slot(nvdev, q_idx); | |
1131 | if (!rcd) | |
1132 | break; | |
1133 | ||
1134 | ret = netvsc_send_recv_completion(channel, rcd->tid, | |
1135 | rcd->status); | |
1136 | if (ret) | |
1137 | break; | |
1138 | ||
1139 | put_recv_comp_slot(nvdev, q_idx); | |
5fa9d3c5 HZ |
1140 | } |
1141 | } | |
1142 | ||
c0b558e5 HZ |
1143 | #define NETVSC_RCD_WATERMARK 80 |
1144 | ||
1145 | /* Get next available slot */ | |
1146 | static inline struct recv_comp_data *get_recv_comp_slot( | |
1147 | struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx) | |
1148 | { | |
1149 | u32 filled, avail, next; | |
1150 | struct recv_comp_data *rcd; | |
1151 | ||
1152 | if (!nvdev->recv_section) | |
1153 | return NULL; | |
1154 | ||
1155 | if (!nvdev->mrc[q_idx].buf) | |
1156 | return NULL; | |
1157 | ||
1158 | if (atomic_read(&nvdev->num_outstanding_recvs) > | |
1159 | nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100) | |
1160 | netvsc_chk_recv_comp(nvdev, channel, q_idx); | |
1161 | ||
1162 | count_recv_comp_slot(nvdev, q_idx, &filled, &avail); | |
1163 | if (!avail) | |
1164 | return NULL; | |
1165 | ||
1166 | next = nvdev->mrc[q_idx].next; | |
1167 | rcd = nvdev->mrc[q_idx].buf + next * sizeof(struct recv_comp_data); | |
1168 | nvdev->mrc[q_idx].next = (next + 1) % NETVSC_RECVSLOT_MAX; | |
1169 | ||
1170 | atomic_inc(&nvdev->num_outstanding_recvs); | |
1171 | ||
1172 | return rcd; | |
1173 | } | |
1174 | ||
97c1723a | 1175 | static void netvsc_receive(struct netvsc_device *net_device, |
5b54dac8 | 1176 | struct vmbus_channel *channel, |
97c1723a KS |
1177 | struct hv_device *device, |
1178 | struct vmpacket_descriptor *packet) | |
fceaf24a | 1179 | { |
85799a37 HZ |
1180 | struct vmtransfer_page_packet_header *vmxferpage_packet; |
1181 | struct nvsp_message *nvsp_packet; | |
4baab261 HZ |
1182 | struct hv_netvsc_packet nv_pkt; |
1183 | struct hv_netvsc_packet *netvsc_packet = &nv_pkt; | |
1184 | u32 status = NVSP_STAT_SUCCESS; | |
45326342 HZ |
1185 | int i; |
1186 | int count = 0; | |
0a1275ca | 1187 | struct net_device *ndev = hv_get_drvdata(device); |
c4b20c63 | 1188 | void *data; |
c0b558e5 HZ |
1189 | int ret; |
1190 | struct recv_comp_data *rcd; | |
1191 | u16 q_idx = channel->offermsg.offer.sub_channel_index; | |
779b4d17 | 1192 | |
21a80820 GKH |
1193 | /* |
1194 | * All inbound packets other than send completion should be xfer page | |
1195 | * packet | |
1196 | */ | |
415f2287 | 1197 | if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) { |
d9871158 | 1198 | netdev_err(ndev, "Unknown packet type received - %d\n", |
415f2287 | 1199 | packet->type); |
fceaf24a HJ |
1200 | return; |
1201 | } | |
1202 | ||
85799a37 | 1203 | nvsp_packet = (struct nvsp_message *)((unsigned long)packet + |
415f2287 | 1204 | (packet->offset8 << 3)); |
fceaf24a | 1205 | |
454f18a9 | 1206 | /* Make sure this is a valid nvsp packet */ |
53d21fdb HZ |
1207 | if (nvsp_packet->hdr.msg_type != |
1208 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT) { | |
d9871158 | 1209 | netdev_err(ndev, "Unknown nvsp packet type received-" |
c909ebbd | 1210 | " %d\n", nvsp_packet->hdr.msg_type); |
fceaf24a HJ |
1211 | return; |
1212 | } | |
1213 | ||
85799a37 | 1214 | vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet; |
fceaf24a | 1215 | |
415f2287 | 1216 | if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) { |
d9871158 | 1217 | netdev_err(ndev, "Invalid xfer page set id - " |
c909ebbd | 1218 | "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID, |
415f2287 | 1219 | vmxferpage_packet->xfer_pageset_id); |
fceaf24a HJ |
1220 | return; |
1221 | } | |
1222 | ||
4baab261 | 1223 | count = vmxferpage_packet->range_cnt; |
fceaf24a | 1224 | |
454f18a9 | 1225 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
4baab261 | 1226 | for (i = 0; i < count; i++) { |
454f18a9 | 1227 | /* Initialize the netvsc packet */ |
c4b20c63 | 1228 | data = (void *)((unsigned long)net_device-> |
45326342 | 1229 | recv_buf + vmxferpage_packet->ranges[i].byte_offset); |
72a2f5bd | 1230 | netvsc_packet->total_data_buflen = |
415f2287 | 1231 | vmxferpage_packet->ranges[i].byte_count; |
fceaf24a | 1232 | |
454f18a9 | 1233 | /* Pass it to the upper layer */ |
10082f98 KS |
1234 | status = rndis_filter_receive(device, netvsc_packet, &data, |
1235 | channel); | |
fceaf24a HJ |
1236 | } |
1237 | ||
c0b558e5 HZ |
1238 | if (!net_device->mrc[q_idx].buf) { |
1239 | ret = netvsc_send_recv_completion(channel, | |
1240 | vmxferpage_packet->d.trans_id, | |
1241 | status); | |
1242 | if (ret) | |
1243 | netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n", | |
1244 | q_idx, vmxferpage_packet->d.trans_id, ret); | |
1245 | return; | |
1246 | } | |
1247 | ||
1248 | rcd = get_recv_comp_slot(net_device, channel, q_idx); | |
1249 | ||
1250 | if (!rcd) { | |
1251 | netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", | |
1252 | q_idx, vmxferpage_packet->d.trans_id); | |
1253 | return; | |
1254 | } | |
1255 | ||
1256 | rcd->tid = vmxferpage_packet->d.trans_id; | |
1257 | rcd->status = status; | |
fceaf24a HJ |
1258 | } |
1259 | ||
5b54dac8 | 1260 | static void netvsc_send_table(struct hv_device *hdev, |
71790a27 | 1261 | struct nvsp_message *nvmsg) |
5b54dac8 HZ |
1262 | { |
1263 | struct netvsc_device *nvscdev; | |
0a1275ca | 1264 | struct net_device *ndev = hv_get_drvdata(hdev); |
5b54dac8 HZ |
1265 | int i; |
1266 | u32 count, *tab; | |
1267 | ||
1268 | nvscdev = get_outbound_net_device(hdev); | |
1269 | if (!nvscdev) | |
1270 | return; | |
5b54dac8 | 1271 | |
5b54dac8 HZ |
1272 | count = nvmsg->msg.v5_msg.send_table.count; |
1273 | if (count != VRSS_SEND_TAB_SIZE) { | |
1274 | netdev_err(ndev, "Received wrong send-table size:%u\n", count); | |
1275 | return; | |
1276 | } | |
1277 | ||
1278 | tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + | |
1279 | nvmsg->msg.v5_msg.send_table.offset); | |
1280 | ||
1281 | for (i = 0; i < count; i++) | |
1282 | nvscdev->send_table[i] = tab[i]; | |
1283 | } | |
1284 | ||
f9a7da91 | 1285 | static void netvsc_send_vf(struct net_device_context *net_device_ctx, |
71790a27 HZ |
1286 | struct nvsp_message *nvmsg) |
1287 | { | |
f9a7da91 VK |
1288 | net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; |
1289 | net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; | |
71790a27 HZ |
1290 | } |
1291 | ||
1292 | static inline void netvsc_receive_inband(struct hv_device *hdev, | |
f9a7da91 VK |
1293 | struct net_device_context *net_device_ctx, |
1294 | struct nvsp_message *nvmsg) | |
71790a27 HZ |
1295 | { |
1296 | switch (nvmsg->hdr.msg_type) { | |
1297 | case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: | |
1298 | netvsc_send_table(hdev, nvmsg); | |
1299 | break; | |
1300 | ||
1301 | case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: | |
f9a7da91 | 1302 | netvsc_send_vf(net_device_ctx, nvmsg); |
71790a27 HZ |
1303 | break; |
1304 | } | |
1305 | } | |
1306 | ||
99a50bb1 S |
1307 | static void netvsc_process_raw_pkt(struct hv_device *device, |
1308 | struct vmbus_channel *channel, | |
1309 | struct netvsc_device *net_device, | |
1310 | struct net_device *ndev, | |
1311 | u64 request_id, | |
1312 | struct vmpacket_descriptor *desc) | |
1313 | { | |
1314 | struct nvsp_message *nvmsg; | |
f9a7da91 | 1315 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
99a50bb1 S |
1316 | |
1317 | nvmsg = (struct nvsp_message *)((unsigned long) | |
1318 | desc + (desc->offset8 << 3)); | |
1319 | ||
1320 | switch (desc->type) { | |
1321 | case VM_PKT_COMP: | |
1322 | netvsc_send_completion(net_device, channel, device, desc); | |
1323 | break; | |
1324 | ||
1325 | case VM_PKT_DATA_USING_XFER_PAGES: | |
1326 | netvsc_receive(net_device, channel, device, desc); | |
1327 | break; | |
1328 | ||
1329 | case VM_PKT_DATA_INBAND: | |
f9a7da91 | 1330 | netvsc_receive_inband(device, net_device_ctx, nvmsg); |
99a50bb1 S |
1331 | break; |
1332 | ||
1333 | default: | |
1334 | netdev_err(ndev, "unhandled packet type %d, tid %llx\n", | |
1335 | desc->type, request_id); | |
1336 | break; | |
1337 | } | |
1338 | } | |
1339 | ||
5b54dac8 | 1340 | void netvsc_channel_cb(void *context) |
fceaf24a | 1341 | { |
21a80820 | 1342 | int ret; |
5b54dac8 | 1343 | struct vmbus_channel *channel = (struct vmbus_channel *)context; |
c0b558e5 | 1344 | u16 q_idx = channel->offermsg.offer.sub_channel_index; |
5b54dac8 | 1345 | struct hv_device *device; |
85799a37 HZ |
1346 | struct netvsc_device *net_device; |
1347 | u32 bytes_recvd; | |
1348 | u64 request_id; | |
8dc0a06a | 1349 | struct vmpacket_descriptor *desc; |
c6fcf0ba BP |
1350 | unsigned char *buffer; |
1351 | int bufferlen = NETVSC_PACKET_SIZE; | |
2ddd5e5f | 1352 | struct net_device *ndev; |
99a50bb1 | 1353 | bool need_to_commit = false; |
fceaf24a | 1354 | |
5b54dac8 HZ |
1355 | if (channel->primary_channel != NULL) |
1356 | device = channel->primary_channel->device_obj; | |
1357 | else | |
1358 | device = channel->device_obj; | |
1359 | ||
5a71ae30 | 1360 | net_device = get_inbound_net_device(device); |
2ddd5e5f | 1361 | if (!net_device) |
ee0c4c39 | 1362 | return; |
0a1275ca | 1363 | ndev = hv_get_drvdata(device); |
5b54dac8 | 1364 | buffer = get_per_channel_state(channel); |
fceaf24a | 1365 | |
21a80820 | 1366 | do { |
99a50bb1 S |
1367 | desc = get_next_pkt_raw(channel); |
1368 | if (desc != NULL) { | |
1369 | netvsc_process_raw_pkt(device, | |
1370 | channel, | |
1371 | net_device, | |
1372 | ndev, | |
1373 | desc->trans_id, | |
1374 | desc); | |
1375 | ||
1376 | put_pkt_raw(channel, desc); | |
1377 | need_to_commit = true; | |
1378 | continue; | |
1379 | } | |
1380 | if (need_to_commit) { | |
1381 | need_to_commit = false; | |
1382 | commit_rd_index(channel); | |
1383 | } | |
1384 | ||
5b54dac8 | 1385 | ret = vmbus_recvpacket_raw(channel, buffer, bufferlen, |
85799a37 | 1386 | &bytes_recvd, &request_id); |
21a80820 | 1387 | if (ret == 0) { |
85799a37 | 1388 | if (bytes_recvd > 0) { |
21a80820 | 1389 | desc = (struct vmpacket_descriptor *)buffer; |
99a50bb1 S |
1390 | netvsc_process_raw_pkt(device, |
1391 | channel, | |
1392 | net_device, | |
1393 | ndev, | |
1394 | request_id, | |
1395 | desc); | |
21a80820 | 1396 | } else { |
ee0c4c39 KS |
1397 | /* |
1398 | * We are done for this pass. | |
1399 | */ | |
fceaf24a HJ |
1400 | break; |
1401 | } | |
ee0c4c39 | 1402 | |
3d5cad97 | 1403 | } else if (ret == -ENOBUFS) { |
ee0c4c39 KS |
1404 | if (bufferlen > NETVSC_PACKET_SIZE) |
1405 | kfree(buffer); | |
21a80820 | 1406 | /* Handle large packet */ |
85799a37 | 1407 | buffer = kmalloc(bytes_recvd, GFP_ATOMIC); |
21a80820 | 1408 | if (buffer == NULL) { |
454f18a9 | 1409 | /* Try again next time around */ |
d9871158 | 1410 | netdev_err(ndev, |
21a80820 | 1411 | "unable to allocate buffer of size " |
c909ebbd | 1412 | "(%d)!!\n", bytes_recvd); |
fceaf24a HJ |
1413 | break; |
1414 | } | |
1415 | ||
85799a37 | 1416 | bufferlen = bytes_recvd; |
fceaf24a HJ |
1417 | } |
1418 | } while (1); | |
1419 | ||
ee0c4c39 KS |
1420 | if (bufferlen > NETVSC_PACKET_SIZE) |
1421 | kfree(buffer); | |
c0b558e5 HZ |
1422 | |
1423 | netvsc_chk_recv_comp(net_device, channel, q_idx); | |
fceaf24a | 1424 | } |
af24ce42 | 1425 | |
b637e023 HZ |
1426 | /* |
1427 | * netvsc_device_add - Callback when the device belonging to this | |
1428 | * driver is added | |
1429 | */ | |
7bd23a4d | 1430 | int netvsc_device_add(struct hv_device *device, void *additional_info) |
b637e023 | 1431 | { |
88098834 | 1432 | int i, ret = 0; |
aae23986 S |
1433 | int ring_size = |
1434 | ((struct netvsc_device_info *)additional_info)->ring_size; | |
b637e023 | 1435 | struct netvsc_device *net_device; |
88098834 VK |
1436 | struct net_device *ndev = hv_get_drvdata(device); |
1437 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
b637e023 | 1438 | |
88098834 | 1439 | net_device = alloc_net_device(); |
b1c84927 DC |
1440 | if (!net_device) |
1441 | return -ENOMEM; | |
b637e023 | 1442 | |
5b54dac8 HZ |
1443 | net_device->ring_size = ring_size; |
1444 | ||
b637e023 | 1445 | /* Initialize the NetVSC channel extension */ |
35abb21a | 1446 | init_completion(&net_device->channel_init_wait); |
b637e023 | 1447 | |
5b54dac8 HZ |
1448 | set_per_channel_state(device->channel, net_device->cb_buffer); |
1449 | ||
b637e023 | 1450 | /* Open the channel */ |
aae23986 S |
1451 | ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, |
1452 | ring_size * PAGE_SIZE, NULL, 0, | |
5b54dac8 | 1453 | netvsc_channel_cb, device->channel); |
b637e023 HZ |
1454 | |
1455 | if (ret != 0) { | |
d9871158 | 1456 | netdev_err(ndev, "unable to open channel: %d\n", ret); |
b637e023 HZ |
1457 | goto cleanup; |
1458 | } | |
1459 | ||
1460 | /* Channel is opened */ | |
c909ebbd | 1461 | pr_info("hv_netvsc channel opened successfully\n"); |
b637e023 | 1462 | |
88098834 VK |
1463 | /* If we're reopening the device we may have multiple queues, fill the |
1464 | * chn_table with the default channel to use it before subchannels are | |
1465 | * opened. | |
1466 | */ | |
1467 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) | |
1468 | net_device->chn_table[i] = device->channel; | |
1469 | ||
1470 | /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is | |
1471 | * populated. | |
1472 | */ | |
1473 | wmb(); | |
1474 | ||
1475 | net_device_ctx->nvdev = net_device; | |
5b54dac8 | 1476 | |
b637e023 HZ |
1477 | /* Connect with the NetVsp */ |
1478 | ret = netvsc_connect_vsp(device); | |
1479 | if (ret != 0) { | |
d9871158 | 1480 | netdev_err(ndev, |
c909ebbd | 1481 | "unable to connect to NetVSP - %d\n", ret); |
b637e023 HZ |
1482 | goto close; |
1483 | } | |
1484 | ||
1485 | return ret; | |
1486 | ||
1487 | close: | |
1488 | /* Now, we can close the channel safely */ | |
1489 | vmbus_close(device->channel); | |
1490 | ||
1491 | cleanup: | |
f90251c8 | 1492 | free_netvsc_device(net_device); |
b637e023 HZ |
1493 | |
1494 | return ret; | |
1495 | } |