]>
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 | |
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> |
9749fed5 | 32 | #include <linux/rtnetlink.h> |
33 | ||
c25aaf81 | 34 | #include <asm/sync_bitops.h> |
3f335ea2 | 35 | |
5ca7252a | 36 | #include "hyperv_net.h" |
fceaf24a | 37 | |
84bf9cef KS |
38 | /* |
39 | * Switch the data path from the synthetic interface to the VF | |
40 | * interface. | |
41 | */ | |
0a1275ca | 42 | void netvsc_switch_datapath(struct net_device *ndev, bool vf) |
84bf9cef | 43 | { |
3d541ac5 VK |
44 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
45 | struct hv_device *dev = net_device_ctx->device_ctx; | |
79e8cbe7 | 46 | struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); |
0a1275ca | 47 | struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; |
84bf9cef KS |
48 | |
49 | memset(init_pkt, 0, sizeof(struct nvsp_message)); | |
50 | init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; | |
51 | if (vf) | |
52 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
53 | NVSP_DATAPATH_VF; | |
54 | else | |
55 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
56 | NVSP_DATAPATH_SYNTHETIC; | |
57 | ||
58 | vmbus_sendpacket(dev->channel, init_pkt, | |
59 | sizeof(struct nvsp_message), | |
60 | (unsigned long)init_pkt, | |
61 | VM_PKT_DATA_INBAND, 0); | |
53fa1a6f HZ |
62 | |
63 | net_device_ctx->datapath = vf; | |
84bf9cef KS |
64 | } |
65 | ||
88098834 | 66 | static struct netvsc_device *alloc_net_device(void) |
fceaf24a | 67 | { |
85799a37 | 68 | struct netvsc_device *net_device; |
fceaf24a | 69 | |
85799a37 HZ |
70 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
71 | if (!net_device) | |
fceaf24a HJ |
72 | return NULL; |
73 | ||
b8b835a8 | 74 | net_device->chan_table[0].mrc.buf |
75 | = vzalloc(NETVSC_RECVSLOT_MAX * sizeof(struct recv_comp_data)); | |
c0b558e5 | 76 | |
dc5cd894 | 77 | init_waitqueue_head(&net_device->wait_drain); |
c38b9c71 | 78 | net_device->destroy = false; |
84bf9cef | 79 | atomic_set(&net_device->open_cnt, 0); |
7c3877f2 HZ |
80 | net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; |
81 | net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; | |
fd612602 | 82 | init_completion(&net_device->channel_init_wait); |
7c3877f2 | 83 | |
85799a37 | 84 | return net_device; |
fceaf24a HJ |
85 | } |
86 | ||
545a8e79 | 87 | static void free_netvsc_device(struct rcu_head *head) |
f90251c8 | 88 | { |
545a8e79 | 89 | struct netvsc_device *nvdev |
90 | = container_of(head, struct netvsc_device, rcu); | |
c0b558e5 HZ |
91 | int i; |
92 | ||
93 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) | |
b8b835a8 | 94 | vfree(nvdev->chan_table[i].mrc.buf); |
c0b558e5 | 95 | |
f90251c8 HZ |
96 | kfree(nvdev); |
97 | } | |
98 | ||
545a8e79 | 99 | static void free_netvsc_device_rcu(struct netvsc_device *nvdev) |
100 | { | |
101 | call_rcu(&nvdev->rcu, free_netvsc_device); | |
102 | } | |
fceaf24a | 103 | |
7a2a0a84 | 104 | static void netvsc_destroy_buf(struct hv_device *device) |
ec91cd09 HZ |
105 | { |
106 | struct nvsp_message *revoke_packet; | |
3d541ac5 | 107 | struct net_device *ndev = hv_get_drvdata(device); |
2625466d | 108 | struct netvsc_device *net_device = net_device_to_netvsc_device(ndev); |
7a2a0a84 | 109 | int ret; |
ec91cd09 HZ |
110 | |
111 | /* | |
112 | * If we got a section count, it means we received a | |
113 | * SendReceiveBufferComplete msg (ie sent | |
114 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
115 | * to send a revoke msg here | |
116 | */ | |
117 | if (net_device->recv_section_cnt) { | |
118 | /* Send the revoke receive buffer */ | |
119 | revoke_packet = &net_device->revoke_packet; | |
120 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
121 | ||
122 | revoke_packet->hdr.msg_type = | |
123 | NVSP_MSG1_TYPE_REVOKE_RECV_BUF; | |
124 | revoke_packet->msg.v1_msg. | |
125 | revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
126 | ||
3d541ac5 | 127 | ret = vmbus_sendpacket(device->channel, |
ec91cd09 HZ |
128 | revoke_packet, |
129 | sizeof(struct nvsp_message), | |
130 | (unsigned long)revoke_packet, | |
131 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
132 | /* If the failure is because the channel is rescinded; |
133 | * ignore the failure since we cannot send on a rescinded | |
134 | * channel. This would allow us to properly cleanup | |
135 | * even when the channel is rescinded. | |
136 | */ | |
137 | if (device->channel->rescind) | |
138 | ret = 0; | |
ec91cd09 HZ |
139 | /* |
140 | * If we failed here, we might as well return and | |
141 | * have a leak rather than continue and a bugchk | |
142 | */ | |
143 | if (ret != 0) { | |
d9871158 | 144 | netdev_err(ndev, "unable to send " |
c909ebbd | 145 | "revoke receive buffer to netvsp\n"); |
7a2a0a84 | 146 | return; |
ec91cd09 HZ |
147 | } |
148 | } | |
149 | ||
150 | /* Teardown the gpadl on the vsp end */ | |
151 | if (net_device->recv_buf_gpadl_handle) { | |
3d541ac5 VK |
152 | ret = vmbus_teardown_gpadl(device->channel, |
153 | net_device->recv_buf_gpadl_handle); | |
ec91cd09 HZ |
154 | |
155 | /* If we failed here, we might as well return and have a leak | |
156 | * rather than continue and a bugchk | |
157 | */ | |
158 | if (ret != 0) { | |
d9871158 | 159 | netdev_err(ndev, |
c909ebbd | 160 | "unable to teardown receive buffer's gpadl\n"); |
7a2a0a84 | 161 | return; |
ec91cd09 HZ |
162 | } |
163 | net_device->recv_buf_gpadl_handle = 0; | |
164 | } | |
165 | ||
166 | if (net_device->recv_buf) { | |
167 | /* Free up the receive buffer */ | |
b679ef73 | 168 | vfree(net_device->recv_buf); |
ec91cd09 HZ |
169 | net_device->recv_buf = NULL; |
170 | } | |
171 | ||
172 | if (net_device->recv_section) { | |
173 | net_device->recv_section_cnt = 0; | |
174 | kfree(net_device->recv_section); | |
175 | net_device->recv_section = NULL; | |
176 | } | |
177 | ||
c25aaf81 KS |
178 | /* Deal with the send buffer we may have setup. |
179 | * If we got a send section size, it means we received a | |
c51ed182 HZ |
180 | * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent |
181 | * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need | |
c25aaf81 KS |
182 | * to send a revoke msg here |
183 | */ | |
184 | if (net_device->send_section_size) { | |
185 | /* Send the revoke receive buffer */ | |
186 | revoke_packet = &net_device->revoke_packet; | |
187 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
188 | ||
189 | revoke_packet->hdr.msg_type = | |
190 | NVSP_MSG1_TYPE_REVOKE_SEND_BUF; | |
c51ed182 HZ |
191 | revoke_packet->msg.v1_msg.revoke_send_buf.id = |
192 | NETVSC_SEND_BUFFER_ID; | |
c25aaf81 | 193 | |
3d541ac5 | 194 | ret = vmbus_sendpacket(device->channel, |
c25aaf81 KS |
195 | revoke_packet, |
196 | sizeof(struct nvsp_message), | |
197 | (unsigned long)revoke_packet, | |
198 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
199 | |
200 | /* If the failure is because the channel is rescinded; | |
201 | * ignore the failure since we cannot send on a rescinded | |
202 | * channel. This would allow us to properly cleanup | |
203 | * even when the channel is rescinded. | |
204 | */ | |
205 | if (device->channel->rescind) | |
206 | ret = 0; | |
207 | ||
c25aaf81 KS |
208 | /* If we failed here, we might as well return and |
209 | * have a leak rather than continue and a bugchk | |
210 | */ | |
211 | if (ret != 0) { | |
212 | netdev_err(ndev, "unable to send " | |
213 | "revoke send buffer to netvsp\n"); | |
7a2a0a84 | 214 | return; |
c25aaf81 KS |
215 | } |
216 | } | |
217 | /* Teardown the gpadl on the vsp end */ | |
218 | if (net_device->send_buf_gpadl_handle) { | |
3d541ac5 | 219 | ret = vmbus_teardown_gpadl(device->channel, |
c25aaf81 KS |
220 | net_device->send_buf_gpadl_handle); |
221 | ||
222 | /* If we failed here, we might as well return and have a leak | |
223 | * rather than continue and a bugchk | |
224 | */ | |
225 | if (ret != 0) { | |
226 | netdev_err(ndev, | |
227 | "unable to teardown send buffer's gpadl\n"); | |
7a2a0a84 | 228 | return; |
c25aaf81 | 229 | } |
2f18423d | 230 | net_device->send_buf_gpadl_handle = 0; |
c25aaf81 KS |
231 | } |
232 | if (net_device->send_buf) { | |
c51ed182 | 233 | /* Free up the send buffer */ |
06b47aac | 234 | vfree(net_device->send_buf); |
c25aaf81 KS |
235 | net_device->send_buf = NULL; |
236 | } | |
237 | kfree(net_device->send_section_map); | |
ec91cd09 HZ |
238 | } |
239 | ||
95790837 | 240 | static int netvsc_init_buf(struct hv_device *device, |
241 | struct netvsc_device *net_device) | |
fceaf24a | 242 | { |
21a80820 | 243 | int ret = 0; |
85799a37 | 244 | struct nvsp_message *init_packet; |
2ddd5e5f | 245 | struct net_device *ndev; |
fdfb70d2 | 246 | size_t map_words; |
0a726c2b | 247 | int node; |
fceaf24a | 248 | |
0a1275ca | 249 | ndev = hv_get_drvdata(device); |
fceaf24a | 250 | |
0a726c2b S |
251 | node = cpu_to_node(device->channel->target_cpu); |
252 | net_device->recv_buf = vzalloc_node(net_device->recv_buf_size, node); | |
253 | if (!net_device->recv_buf) | |
254 | net_device->recv_buf = vzalloc(net_device->recv_buf_size); | |
255 | ||
53d21fdb | 256 | if (!net_device->recv_buf) { |
d9871158 | 257 | netdev_err(ndev, "unable to allocate receive " |
c909ebbd | 258 | "buffer of size %d\n", net_device->recv_buf_size); |
927bc33c | 259 | ret = -ENOMEM; |
0c3b7b2f | 260 | goto cleanup; |
fceaf24a | 261 | } |
fceaf24a | 262 | |
454f18a9 BP |
263 | /* |
264 | * Establish the gpadl handle for this buffer on this | |
265 | * channel. Note: This call uses the vmbus connection rather | |
266 | * than the channel to establish the gpadl handle. | |
267 | */ | |
53d21fdb HZ |
268 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
269 | net_device->recv_buf_size, | |
270 | &net_device->recv_buf_gpadl_handle); | |
21a80820 | 271 | if (ret != 0) { |
d9871158 | 272 | netdev_err(ndev, |
c909ebbd | 273 | "unable to establish receive buffer's gpadl\n"); |
0c3b7b2f | 274 | goto cleanup; |
fceaf24a HJ |
275 | } |
276 | ||
454f18a9 | 277 | /* Notify the NetVsp of the gpadl handle */ |
53d21fdb | 278 | init_packet = &net_device->channel_init_pkt; |
85799a37 | 279 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb HZ |
280 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
281 | init_packet->msg.v1_msg.send_recv_buf. | |
282 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
283 | init_packet->msg.v1_msg. | |
284 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 285 | |
454f18a9 | 286 | /* Send the gpadl notification request */ |
85799a37 | 287 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 288 | sizeof(struct nvsp_message), |
85799a37 | 289 | (unsigned long)init_packet, |
415f2287 | 290 | VM_PKT_DATA_INBAND, |
5a4df290 | 291 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 292 | if (ret != 0) { |
d9871158 | 293 | netdev_err(ndev, |
c909ebbd | 294 | "unable to send receive buffer's gpadl to netvsp\n"); |
0c3b7b2f | 295 | goto cleanup; |
fceaf24a HJ |
296 | } |
297 | ||
5362855a | 298 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 299 | |
454f18a9 | 300 | /* Check the response */ |
53d21fdb HZ |
301 | if (init_packet->msg.v1_msg. |
302 | send_recv_buf_complete.status != NVSP_STAT_SUCCESS) { | |
d9871158 | 303 | netdev_err(ndev, "Unable to complete receive buffer " |
8bff33ab | 304 | "initialization with NetVsp - status %d\n", |
53d21fdb HZ |
305 | init_packet->msg.v1_msg. |
306 | send_recv_buf_complete.status); | |
927bc33c | 307 | ret = -EINVAL; |
0c3b7b2f | 308 | goto cleanup; |
fceaf24a HJ |
309 | } |
310 | ||
454f18a9 | 311 | /* Parse the response */ |
fceaf24a | 312 | |
53d21fdb HZ |
313 | net_device->recv_section_cnt = init_packet->msg. |
314 | v1_msg.send_recv_buf_complete.num_sections; | |
fceaf24a | 315 | |
c1813200 HZ |
316 | net_device->recv_section = kmemdup( |
317 | init_packet->msg.v1_msg.send_recv_buf_complete.sections, | |
318 | net_device->recv_section_cnt * | |
319 | sizeof(struct nvsp_1_receive_buffer_section), | |
320 | GFP_KERNEL); | |
53d21fdb | 321 | if (net_device->recv_section == NULL) { |
927bc33c | 322 | ret = -EINVAL; |
0c3b7b2f | 323 | goto cleanup; |
fceaf24a HJ |
324 | } |
325 | ||
21a80820 GKH |
326 | /* |
327 | * For 1st release, there should only be 1 section that represents the | |
328 | * entire receive buffer | |
329 | */ | |
53d21fdb HZ |
330 | if (net_device->recv_section_cnt != 1 || |
331 | net_device->recv_section->offset != 0) { | |
927bc33c | 332 | ret = -EINVAL; |
0c3b7b2f | 333 | goto cleanup; |
fceaf24a HJ |
334 | } |
335 | ||
c25aaf81 KS |
336 | /* Now setup the send buffer. |
337 | */ | |
5defde59 S |
338 | net_device->send_buf = vzalloc_node(net_device->send_buf_size, node); |
339 | if (!net_device->send_buf) | |
340 | net_device->send_buf = vzalloc(net_device->send_buf_size); | |
c25aaf81 KS |
341 | if (!net_device->send_buf) { |
342 | netdev_err(ndev, "unable to allocate send " | |
343 | "buffer of size %d\n", net_device->send_buf_size); | |
344 | ret = -ENOMEM; | |
345 | goto cleanup; | |
346 | } | |
347 | ||
348 | /* Establish the gpadl handle for this buffer on this | |
349 | * channel. Note: This call uses the vmbus connection rather | |
350 | * than the channel to establish the gpadl handle. | |
351 | */ | |
352 | ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, | |
353 | net_device->send_buf_size, | |
354 | &net_device->send_buf_gpadl_handle); | |
355 | if (ret != 0) { | |
356 | netdev_err(ndev, | |
357 | "unable to establish send buffer's gpadl\n"); | |
358 | goto cleanup; | |
359 | } | |
360 | ||
361 | /* Notify the NetVsp of the gpadl handle */ | |
362 | init_packet = &net_device->channel_init_pkt; | |
363 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
364 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; | |
c51ed182 | 365 | init_packet->msg.v1_msg.send_send_buf.gpadl_handle = |
c25aaf81 | 366 | net_device->send_buf_gpadl_handle; |
c51ed182 | 367 | init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; |
c25aaf81 KS |
368 | |
369 | /* Send the gpadl notification request */ | |
370 | ret = vmbus_sendpacket(device->channel, init_packet, | |
371 | sizeof(struct nvsp_message), | |
372 | (unsigned long)init_packet, | |
373 | VM_PKT_DATA_INBAND, | |
374 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
375 | if (ret != 0) { | |
376 | netdev_err(ndev, | |
377 | "unable to send send buffer's gpadl to netvsp\n"); | |
378 | goto cleanup; | |
379 | } | |
380 | ||
5362855a | 381 | wait_for_completion(&net_device->channel_init_wait); |
c25aaf81 KS |
382 | |
383 | /* Check the response */ | |
384 | if (init_packet->msg.v1_msg. | |
385 | send_send_buf_complete.status != NVSP_STAT_SUCCESS) { | |
386 | netdev_err(ndev, "Unable to complete send buffer " | |
387 | "initialization with NetVsp - status %d\n", | |
388 | init_packet->msg.v1_msg. | |
c51ed182 | 389 | send_send_buf_complete.status); |
c25aaf81 KS |
390 | ret = -EINVAL; |
391 | goto cleanup; | |
392 | } | |
393 | ||
394 | /* Parse the response */ | |
395 | net_device->send_section_size = init_packet->msg. | |
396 | v1_msg.send_send_buf_complete.section_size; | |
397 | ||
398 | /* Section count is simply the size divided by the section size. | |
399 | */ | |
400 | net_device->send_section_cnt = | |
796cc88c | 401 | net_device->send_buf_size / net_device->send_section_size; |
c25aaf81 | 402 | |
93ba2222 VK |
403 | netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", |
404 | net_device->send_section_size, net_device->send_section_cnt); | |
c25aaf81 KS |
405 | |
406 | /* Setup state for managing the send buffer. */ | |
fdfb70d2 | 407 | map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); |
c25aaf81 | 408 | |
fdfb70d2 | 409 | net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); |
dd1d3f8f WY |
410 | if (net_device->send_section_map == NULL) { |
411 | ret = -ENOMEM; | |
c25aaf81 | 412 | goto cleanup; |
dd1d3f8f | 413 | } |
c25aaf81 | 414 | |
0c3b7b2f | 415 | goto exit; |
fceaf24a | 416 | |
0c3b7b2f | 417 | cleanup: |
3d541ac5 | 418 | netvsc_destroy_buf(device); |
fceaf24a | 419 | |
0c3b7b2f | 420 | exit: |
fceaf24a HJ |
421 | return ret; |
422 | } | |
423 | ||
f157e78d HZ |
424 | /* Negotiate NVSP protocol version */ |
425 | static int negotiate_nvsp_ver(struct hv_device *device, | |
426 | struct netvsc_device *net_device, | |
427 | struct nvsp_message *init_packet, | |
428 | u32 nvsp_ver) | |
fceaf24a | 429 | { |
0a1275ca | 430 | struct net_device *ndev = hv_get_drvdata(device); |
7390fe9c | 431 | int ret; |
fceaf24a | 432 | |
85799a37 | 433 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb | 434 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
f157e78d HZ |
435 | init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; |
436 | init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; | |
fceaf24a | 437 | |
454f18a9 | 438 | /* Send the init request */ |
85799a37 | 439 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 440 | sizeof(struct nvsp_message), |
85799a37 | 441 | (unsigned long)init_packet, |
415f2287 | 442 | VM_PKT_DATA_INBAND, |
5a4df290 | 443 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 444 | |
b8a3d52b | 445 | if (ret != 0) |
f157e78d | 446 | return ret; |
fceaf24a | 447 | |
5362855a | 448 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 449 | |
53d21fdb | 450 | if (init_packet->msg.init_msg.init_complete.status != |
f157e78d HZ |
451 | NVSP_STAT_SUCCESS) |
452 | return -EINVAL; | |
fceaf24a | 453 | |
a1eabb01 | 454 | if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
f157e78d HZ |
455 | return 0; |
456 | ||
71790a27 | 457 | /* NVSPv2 or later: Send NDIS config */ |
f157e78d HZ |
458 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
459 | init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; | |
0a1275ca | 460 | init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; |
1f5f3a75 | 461 | init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
f157e78d | 462 | |
7f5d5af0 | 463 | if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { |
71790a27 HZ |
464 | init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; |
465 | ||
7f5d5af0 HZ |
466 | /* Teaming bit is needed to receive link speed updates */ |
467 | init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; | |
468 | } | |
469 | ||
f157e78d HZ |
470 | ret = vmbus_sendpacket(device->channel, init_packet, |
471 | sizeof(struct nvsp_message), | |
472 | (unsigned long)init_packet, | |
473 | VM_PKT_DATA_INBAND, 0); | |
474 | ||
475 | return ret; | |
476 | } | |
477 | ||
95790837 | 478 | static int netvsc_connect_vsp(struct hv_device *device, |
479 | struct netvsc_device *net_device) | |
f157e78d | 480 | { |
e5a78fad SH |
481 | const u32 ver_list[] = { |
482 | NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, | |
95790837 | 483 | NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 |
484 | }; | |
485 | struct nvsp_message *init_packet; | |
486 | int ndis_version, i, ret; | |
f157e78d HZ |
487 | |
488 | init_packet = &net_device->channel_init_pkt; | |
489 | ||
490 | /* Negotiate the latest NVSP protocol supported */ | |
e5a78fad | 491 | for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) |
a1eabb01 HZ |
492 | if (negotiate_nvsp_ver(device, net_device, init_packet, |
493 | ver_list[i]) == 0) { | |
494 | net_device->nvsp_version = ver_list[i]; | |
495 | break; | |
496 | } | |
497 | ||
498 | if (i < 0) { | |
0f48c72c | 499 | ret = -EPROTO; |
0c3b7b2f | 500 | goto cleanup; |
fceaf24a | 501 | } |
f157e78d HZ |
502 | |
503 | pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); | |
504 | ||
454f18a9 | 505 | /* Send the ndis version */ |
85799a37 | 506 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 507 | |
a1eabb01 | 508 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) |
1f73db49 | 509 | ndis_version = 0x00060001; |
a1eabb01 HZ |
510 | else |
511 | ndis_version = 0x0006001e; | |
fceaf24a | 512 | |
53d21fdb HZ |
513 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
514 | init_packet->msg.v1_msg. | |
515 | send_ndis_ver.ndis_major_ver = | |
85799a37 | 516 | (ndis_version & 0xFFFF0000) >> 16; |
53d21fdb HZ |
517 | init_packet->msg.v1_msg. |
518 | send_ndis_ver.ndis_minor_ver = | |
85799a37 | 519 | ndis_version & 0xFFFF; |
fceaf24a | 520 | |
454f18a9 | 521 | /* Send the init request */ |
85799a37 | 522 | ret = vmbus_sendpacket(device->channel, init_packet, |
0c3b7b2f S |
523 | sizeof(struct nvsp_message), |
524 | (unsigned long)init_packet, | |
525 | VM_PKT_DATA_INBAND, 0); | |
0f48c72c | 526 | if (ret != 0) |
0c3b7b2f | 527 | goto cleanup; |
454f18a9 BP |
528 | |
529 | /* Post the big receive buffer to NetVSP */ | |
99d3016d HZ |
530 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) |
531 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY; | |
532 | else | |
533 | net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE; | |
c25aaf81 | 534 | net_device->send_buf_size = NETVSC_SEND_BUFFER_SIZE; |
99d3016d | 535 | |
95790837 | 536 | ret = netvsc_init_buf(device, net_device); |
fceaf24a | 537 | |
0c3b7b2f | 538 | cleanup: |
fceaf24a HJ |
539 | return ret; |
540 | } | |
541 | ||
3d541ac5 | 542 | static void netvsc_disconnect_vsp(struct hv_device *device) |
fceaf24a | 543 | { |
3d541ac5 | 544 | netvsc_destroy_buf(device); |
fceaf24a HJ |
545 | } |
546 | ||
3e189519 | 547 | /* |
5a71ae30 | 548 | * netvsc_device_remove - Callback when the root bus device is removed |
21a80820 | 549 | */ |
e08f3ea5 | 550 | void netvsc_device_remove(struct hv_device *device) |
fceaf24a | 551 | { |
3d541ac5 VK |
552 | struct net_device *ndev = hv_get_drvdata(device); |
553 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
79e8cbe7 | 554 | struct netvsc_device *net_device |
555 | = rtnl_dereference(net_device_ctx->nvdev); | |
15a863bf | 556 | int i; |
fceaf24a | 557 | |
3d541ac5 | 558 | netvsc_disconnect_vsp(device); |
9d88f33a | 559 | |
545a8e79 | 560 | RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
3852409b | 561 | |
86c921af S |
562 | /* |
563 | * At this point, no one should be accessing net_device | |
564 | * except in here | |
565 | */ | |
93ba2222 | 566 | netdev_dbg(ndev, "net device safe to remove\n"); |
fceaf24a | 567 | |
454f18a9 | 568 | /* Now, we can close the channel safely */ |
85799a37 | 569 | vmbus_close(device->channel); |
fceaf24a | 570 | |
76bb5db5 | 571 | /* And dissassociate NAPI context from device */ |
79cd874c | 572 | for (i = 0; i < net_device->num_chn; i++) |
76bb5db5 | 573 | netif_napi_del(&net_device->chan_table[i].napi); |
15a863bf | 574 | |
454f18a9 | 575 | /* Release all resources */ |
545a8e79 | 576 | free_netvsc_device_rcu(net_device); |
fceaf24a HJ |
577 | } |
578 | ||
33be96e4 HZ |
579 | #define RING_AVAIL_PERCENT_HIWATER 20 |
580 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
581 | ||
582 | /* | |
583 | * Get the percentage of available bytes to write in the ring. | |
584 | * The return value is in range from 0 to 100. | |
585 | */ | |
586 | static inline u32 hv_ringbuf_avail_percent( | |
587 | struct hv_ring_buffer_info *ring_info) | |
588 | { | |
589 | u32 avail_read, avail_write; | |
590 | ||
591 | hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); | |
592 | ||
593 | return avail_write * 100 / ring_info->ring_datasize; | |
594 | } | |
595 | ||
c25aaf81 KS |
596 | static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
597 | u32 index) | |
598 | { | |
599 | sync_change_bit(index, net_device->send_section_map); | |
600 | } | |
601 | ||
bc304dd3 SH |
602 | static void netvsc_send_tx_complete(struct netvsc_device *net_device, |
603 | struct vmbus_channel *incoming_channel, | |
604 | struct hv_device *device, | |
f9645430 | 605 | const struct vmpacket_descriptor *desc, |
606 | int budget) | |
bc304dd3 | 607 | { |
50698d80 | 608 | struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id; |
bc304dd3 | 609 | struct net_device *ndev = hv_get_drvdata(device); |
bc304dd3 | 610 | struct vmbus_channel *channel = device->channel; |
bc304dd3 SH |
611 | u16 q_idx = 0; |
612 | int queue_sends; | |
613 | ||
614 | /* Notify the layer above us */ | |
615 | if (likely(skb)) { | |
793e3955 | 616 | const struct hv_netvsc_packet *packet |
bc304dd3 | 617 | = (struct hv_netvsc_packet *)skb->cb; |
793e3955 | 618 | u32 send_index = packet->send_buf_index; |
619 | struct netvsc_stats *tx_stats; | |
bc304dd3 SH |
620 | |
621 | if (send_index != NETVSC_INVALID_INDEX) | |
622 | netvsc_free_send_slot(net_device, send_index); | |
793e3955 | 623 | q_idx = packet->q_idx; |
bc304dd3 SH |
624 | channel = incoming_channel; |
625 | ||
6c80f3fc | 626 | tx_stats = &net_device->chan_table[q_idx].tx_stats; |
793e3955 | 627 | |
628 | u64_stats_update_begin(&tx_stats->syncp); | |
629 | tx_stats->packets += packet->total_packets; | |
630 | tx_stats->bytes += packet->total_bytes; | |
631 | u64_stats_update_end(&tx_stats->syncp); | |
632 | ||
f9645430 | 633 | napi_consume_skb(skb, budget); |
bc304dd3 SH |
634 | } |
635 | ||
b8b835a8 | 636 | queue_sends = |
637 | atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); | |
bc304dd3 | 638 | |
46b4f7f5 | 639 | if (net_device->destroy && queue_sends == 0) |
bc304dd3 SH |
640 | wake_up(&net_device->wait_drain); |
641 | ||
642 | if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) && | |
bc304dd3 SH |
643 | (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER || |
644 | queue_sends < 1)) | |
645 | netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx)); | |
646 | } | |
647 | ||
97c1723a | 648 | static void netvsc_send_completion(struct netvsc_device *net_device, |
25b85ee8 | 649 | struct vmbus_channel *incoming_channel, |
97c1723a | 650 | struct hv_device *device, |
f9645430 | 651 | const struct vmpacket_descriptor *desc, |
652 | int budget) | |
fceaf24a | 653 | { |
f3dd3f47 | 654 | struct nvsp_message *nvsp_packet = hv_pkt_data(desc); |
3d541ac5 | 655 | struct net_device *ndev = hv_get_drvdata(device); |
fceaf24a | 656 | |
bc304dd3 SH |
657 | switch (nvsp_packet->hdr.msg_type) { |
658 | case NVSP_MSG_TYPE_INIT_COMPLETE: | |
659 | case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: | |
660 | case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: | |
661 | case NVSP_MSG5_TYPE_SUBCHANNEL: | |
454f18a9 | 662 | /* Copy the response back */ |
53d21fdb | 663 | memcpy(&net_device->channel_init_pkt, nvsp_packet, |
21a80820 | 664 | sizeof(struct nvsp_message)); |
35abb21a | 665 | complete(&net_device->channel_init_wait); |
bc304dd3 SH |
666 | break; |
667 | ||
668 | case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: | |
669 | netvsc_send_tx_complete(net_device, incoming_channel, | |
f9645430 | 670 | device, desc, budget); |
bc304dd3 | 671 | break; |
fceaf24a | 672 | |
bc304dd3 SH |
673 | default: |
674 | netdev_err(ndev, | |
675 | "Unknown send completion type %d received!!\n", | |
676 | nvsp_packet->hdr.msg_type); | |
fceaf24a | 677 | } |
fceaf24a HJ |
678 | } |
679 | ||
c25aaf81 KS |
680 | static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
681 | { | |
b58a1858 | 682 | unsigned long *map_addr = net_device->send_section_map; |
683 | unsigned int i; | |
684 | ||
fdfb70d2 | 685 | for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { |
b58a1858 | 686 | if (sync_test_and_set_bit(i, map_addr) == 0) |
687 | return i; | |
c25aaf81 | 688 | } |
b58a1858 | 689 | |
690 | return NETVSC_INVALID_INDEX; | |
c25aaf81 KS |
691 | } |
692 | ||
da19fcd0 LP |
693 | static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
694 | unsigned int section_index, | |
7c3877f2 | 695 | u32 pend_size, |
24476760 | 696 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 697 | struct rndis_message *rndis_msg, |
694a9fb0 KS |
698 | struct hv_page_buffer **pb, |
699 | struct sk_buff *skb) | |
c25aaf81 KS |
700 | { |
701 | char *start = net_device->send_buf; | |
7c3877f2 HZ |
702 | char *dest = start + (section_index * net_device->send_section_size) |
703 | + pend_size; | |
c25aaf81 KS |
704 | int i; |
705 | u32 msg_size = 0; | |
7c3877f2 HZ |
706 | u32 padding = 0; |
707 | u32 remain = packet->total_data_buflen % net_device->pkt_align; | |
aa0a34be HZ |
708 | u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : |
709 | packet->page_buf_cnt; | |
7c3877f2 HZ |
710 | |
711 | /* Add padding */ | |
ebc1dcf6 | 712 | if (skb->xmit_more && remain && !packet->cp_partial) { |
7c3877f2 | 713 | padding = net_device->pkt_align - remain; |
24476760 | 714 | rndis_msg->msg_len += padding; |
7c3877f2 HZ |
715 | packet->total_data_buflen += padding; |
716 | } | |
c25aaf81 | 717 | |
aa0a34be | 718 | for (i = 0; i < page_count; i++) { |
a9f2e2d6 KS |
719 | char *src = phys_to_virt((*pb)[i].pfn << PAGE_SHIFT); |
720 | u32 offset = (*pb)[i].offset; | |
721 | u32 len = (*pb)[i].len; | |
c25aaf81 KS |
722 | |
723 | memcpy(dest, (src + offset), len); | |
724 | msg_size += len; | |
725 | dest += len; | |
726 | } | |
7c3877f2 HZ |
727 | |
728 | if (padding) { | |
729 | memset(dest, 0, padding); | |
730 | msg_size += padding; | |
731 | } | |
732 | ||
c25aaf81 KS |
733 | return msg_size; |
734 | } | |
735 | ||
3a8963ac | 736 | static inline int netvsc_send_pkt( |
0a1275ca | 737 | struct hv_device *device, |
7c3877f2 | 738 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 739 | struct netvsc_device *net_device, |
3a3d9a0a KS |
740 | struct hv_page_buffer **pb, |
741 | struct sk_buff *skb) | |
fceaf24a | 742 | { |
7c3877f2 | 743 | struct nvsp_message nvmsg; |
b8b835a8 | 744 | struct netvsc_channel *nvchan |
745 | = &net_device->chan_table[packet->q_idx]; | |
746 | struct vmbus_channel *out_channel = nvchan->channel; | |
0a1275ca | 747 | struct net_device *ndev = hv_get_drvdata(device); |
b8b835a8 | 748 | struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); |
7c3877f2 HZ |
749 | u64 req_id; |
750 | int ret; | |
aa0a34be | 751 | struct hv_page_buffer *pgbuf; |
82fa3c77 | 752 | u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); |
c25aaf81 | 753 | |
7c3877f2 | 754 | nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
694a9fb0 | 755 | if (skb != NULL) { |
21a80820 | 756 | /* 0 is RMC_DATA; */ |
7c3877f2 | 757 | nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 0; |
21a80820 GKH |
758 | } else { |
759 | /* 1 is RMC_CONTROL; */ | |
7c3877f2 | 760 | nvmsg.msg.v1_msg.send_rndis_pkt.channel_type = 1; |
21a80820 | 761 | } |
fceaf24a | 762 | |
7c3877f2 HZ |
763 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_index = |
764 | packet->send_buf_index; | |
765 | if (packet->send_buf_index == NETVSC_INVALID_INDEX) | |
766 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0; | |
767 | else | |
768 | nvmsg.msg.v1_msg.send_rndis_pkt.send_buf_section_size = | |
769 | packet->total_data_buflen; | |
21a80820 | 770 | |
3a3d9a0a | 771 | req_id = (ulong)skb; |
f1ea3cd7 | 772 | |
c3582a2c HZ |
773 | if (out_channel->rescind) |
774 | return -ENODEV; | |
775 | ||
72a2f5bd | 776 | if (packet->page_buf_cnt) { |
a9f2e2d6 KS |
777 | pgbuf = packet->cp_partial ? (*pb) + |
778 | packet->rmsg_pgcnt : (*pb); | |
82fa3c77 KS |
779 | ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, |
780 | pgbuf, | |
781 | packet->page_buf_cnt, | |
782 | &nvmsg, | |
783 | sizeof(struct nvsp_message), | |
784 | req_id, | |
3454323c | 785 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 786 | } else { |
82fa3c77 KS |
787 | ret = vmbus_sendpacket_ctl(out_channel, &nvmsg, |
788 | sizeof(struct nvsp_message), | |
789 | req_id, | |
790 | VM_PKT_DATA_INBAND, | |
3454323c | 791 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
fceaf24a HJ |
792 | } |
793 | ||
1d06825b | 794 | if (ret == 0) { |
b8b835a8 | 795 | atomic_inc_return(&nvchan->queue_sends); |
5b54dac8 | 796 | |
46b4f7f5 | 797 | if (ring_avail < RING_AVAIL_PERCENT_LOWATER) |
b8b835a8 | 798 | netif_tx_stop_queue(txq); |
1d06825b | 799 | } else if (ret == -EAGAIN) { |
b8b835a8 | 800 | netif_tx_stop_queue(txq); |
801 | if (atomic_read(&nvchan->queue_sends) < 1) { | |
802 | netif_tx_wake_queue(txq); | |
33be96e4 HZ |
803 | ret = -ENOSPC; |
804 | } | |
1d06825b | 805 | } else { |
d9871158 | 806 | netdev_err(ndev, "Unable to send packet %p ret %d\n", |
85799a37 | 807 | packet, ret); |
1d06825b | 808 | } |
fceaf24a | 809 | |
7c3877f2 HZ |
810 | return ret; |
811 | } | |
812 | ||
c85e4924 HZ |
813 | /* Move packet out of multi send data (msd), and clear msd */ |
814 | static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, | |
815 | struct sk_buff **msd_skb, | |
816 | struct multi_send_data *msdp) | |
817 | { | |
818 | *msd_skb = msdp->skb; | |
819 | *msd_send = msdp->pkt; | |
820 | msdp->skb = NULL; | |
821 | msdp->pkt = NULL; | |
822 | msdp->count = 0; | |
823 | } | |
824 | ||
7c3877f2 | 825 | int netvsc_send(struct hv_device *device, |
24476760 | 826 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 827 | struct rndis_message *rndis_msg, |
3a3d9a0a KS |
828 | struct hv_page_buffer **pb, |
829 | struct sk_buff *skb) | |
7c3877f2 | 830 | { |
592b4fe8 | 831 | struct netvsc_device *net_device = hv_device_to_netvsc_device(device); |
6c4c137e | 832 | int ret = 0; |
b8b835a8 | 833 | struct netvsc_channel *nvchan; |
7c3877f2 HZ |
834 | u32 pktlen = packet->total_data_buflen, msd_len = 0; |
835 | unsigned int section_index = NETVSC_INVALID_INDEX; | |
7c3877f2 HZ |
836 | struct multi_send_data *msdp; |
837 | struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; | |
c85e4924 | 838 | struct sk_buff *msd_skb = NULL; |
aa0a34be | 839 | bool try_batch; |
bde79be5 | 840 | bool xmit_more = (skb != NULL) ? skb->xmit_more : false; |
7c3877f2 | 841 | |
592b4fe8 | 842 | /* If device is rescinded, return error and packet will get dropped. */ |
843 | if (unlikely(net_device->destroy)) | |
7c3877f2 HZ |
844 | return -ENODEV; |
845 | ||
e8f0a89c VK |
846 | /* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get |
847 | * here before the negotiation with the host is finished and | |
848 | * send_section_map may not be allocated yet. | |
849 | */ | |
2d694d2a | 850 | if (unlikely(!net_device->send_section_map)) |
e8f0a89c VK |
851 | return -EAGAIN; |
852 | ||
b8b835a8 | 853 | nvchan = &net_device->chan_table[packet->q_idx]; |
7c3877f2 | 854 | packet->send_buf_index = NETVSC_INVALID_INDEX; |
aa0a34be | 855 | packet->cp_partial = false; |
7c3877f2 | 856 | |
cf8190e4 HZ |
857 | /* Send control message directly without accessing msd (Multi-Send |
858 | * Data) field which may be changed during data packet processing. | |
859 | */ | |
860 | if (!skb) { | |
861 | cur_send = packet; | |
862 | goto send_now; | |
863 | } | |
864 | ||
7c3877f2 | 865 | /* batch packets in send buffer if possible */ |
b8b835a8 | 866 | msdp = &nvchan->msd; |
7c3877f2 HZ |
867 | if (msdp->pkt) |
868 | msd_len = msdp->pkt->total_data_buflen; | |
869 | ||
ebc1dcf6 | 870 | try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; |
aa0a34be | 871 | if (try_batch && msd_len + pktlen + net_device->pkt_align < |
7c3877f2 HZ |
872 | net_device->send_section_size) { |
873 | section_index = msdp->pkt->send_buf_index; | |
874 | ||
aa0a34be HZ |
875 | } else if (try_batch && msd_len + packet->rmsg_size < |
876 | net_device->send_section_size) { | |
877 | section_index = msdp->pkt->send_buf_index; | |
878 | packet->cp_partial = true; | |
879 | ||
ebc1dcf6 | 880 | } else if (pktlen + net_device->pkt_align < |
7c3877f2 HZ |
881 | net_device->send_section_size) { |
882 | section_index = netvsc_get_next_send_section(net_device); | |
883 | if (section_index != NETVSC_INVALID_INDEX) { | |
c85e4924 HZ |
884 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
885 | msd_len = 0; | |
7c3877f2 HZ |
886 | } |
887 | } | |
888 | ||
889 | if (section_index != NETVSC_INVALID_INDEX) { | |
890 | netvsc_copy_to_send_buf(net_device, | |
891 | section_index, msd_len, | |
694a9fb0 | 892 | packet, rndis_msg, pb, skb); |
b08cc791 | 893 | |
7c3877f2 | 894 | packet->send_buf_index = section_index; |
aa0a34be HZ |
895 | |
896 | if (packet->cp_partial) { | |
897 | packet->page_buf_cnt -= packet->rmsg_pgcnt; | |
898 | packet->total_data_buflen = msd_len + packet->rmsg_size; | |
899 | } else { | |
900 | packet->page_buf_cnt = 0; | |
901 | packet->total_data_buflen += msd_len; | |
aa0a34be | 902 | } |
7c3877f2 | 903 | |
793e3955 | 904 | if (msdp->pkt) { |
905 | packet->total_packets += msdp->pkt->total_packets; | |
906 | packet->total_bytes += msdp->pkt->total_bytes; | |
907 | } | |
908 | ||
c85e4924 | 909 | if (msdp->skb) |
17db4bce | 910 | dev_consume_skb_any(msdp->skb); |
ee90b812 | 911 | |
bde79be5 | 912 | if (xmit_more && !packet->cp_partial) { |
c85e4924 | 913 | msdp->skb = skb; |
7c3877f2 HZ |
914 | msdp->pkt = packet; |
915 | msdp->count++; | |
916 | } else { | |
917 | cur_send = packet; | |
c85e4924 | 918 | msdp->skb = NULL; |
7c3877f2 HZ |
919 | msdp->pkt = NULL; |
920 | msdp->count = 0; | |
921 | } | |
922 | } else { | |
c85e4924 | 923 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
7c3877f2 HZ |
924 | cur_send = packet; |
925 | } | |
926 | ||
7c3877f2 | 927 | if (msd_send) { |
6c4c137e SH |
928 | int m_ret = netvsc_send_pkt(device, msd_send, net_device, |
929 | NULL, msd_skb); | |
7c3877f2 HZ |
930 | |
931 | if (m_ret != 0) { | |
932 | netvsc_free_send_slot(net_device, | |
933 | msd_send->send_buf_index); | |
c85e4924 | 934 | dev_kfree_skb_any(msd_skb); |
7c3877f2 HZ |
935 | } |
936 | } | |
937 | ||
cf8190e4 | 938 | send_now: |
7c3877f2 | 939 | if (cur_send) |
0a1275ca | 940 | ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); |
7c3877f2 | 941 | |
7aab5159 JS |
942 | if (ret != 0 && section_index != NETVSC_INVALID_INDEX) |
943 | netvsc_free_send_slot(net_device, section_index); | |
d953ca4d | 944 | |
fceaf24a HJ |
945 | return ret; |
946 | } | |
947 | ||
c0b558e5 HZ |
948 | static int netvsc_send_recv_completion(struct vmbus_channel *channel, |
949 | u64 transaction_id, u32 status) | |
5fa9d3c5 HZ |
950 | { |
951 | struct nvsp_message recvcompMessage; | |
5fa9d3c5 HZ |
952 | int ret; |
953 | ||
954 | recvcompMessage.hdr.msg_type = | |
955 | NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE; | |
956 | ||
63f6921d | 957 | recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status = status; |
5fa9d3c5 | 958 | |
5fa9d3c5 | 959 | /* Send the completion */ |
5b54dac8 | 960 | ret = vmbus_sendpacket(channel, &recvcompMessage, |
c0b558e5 HZ |
961 | sizeof(struct nvsp_message_header) + sizeof(u32), |
962 | transaction_id, VM_PKT_COMP, 0); | |
963 | ||
964 | return ret; | |
965 | } | |
966 | ||
967 | static inline void count_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx, | |
968 | u32 *filled, u32 *avail) | |
969 | { | |
b8b835a8 | 970 | struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc; |
971 | u32 first = mrc->first; | |
972 | u32 next = mrc->next; | |
c0b558e5 HZ |
973 | |
974 | *filled = (first > next) ? NETVSC_RECVSLOT_MAX - first + next : | |
975 | next - first; | |
976 | ||
977 | *avail = NETVSC_RECVSLOT_MAX - *filled - 1; | |
978 | } | |
979 | ||
980 | /* Read the first filled slot, no change to index */ | |
981 | static inline struct recv_comp_data *read_recv_comp_slot(struct netvsc_device | |
982 | *nvdev, u16 q_idx) | |
983 | { | |
b8b835a8 | 984 | struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc; |
c0b558e5 HZ |
985 | u32 filled, avail; |
986 | ||
b8b835a8 | 987 | if (unlikely(!mrc->buf)) |
c0b558e5 HZ |
988 | return NULL; |
989 | ||
990 | count_recv_comp_slot(nvdev, q_idx, &filled, &avail); | |
991 | if (!filled) | |
992 | return NULL; | |
993 | ||
b8b835a8 | 994 | return mrc->buf + mrc->first * sizeof(struct recv_comp_data); |
c0b558e5 HZ |
995 | } |
996 | ||
997 | /* Put the first filled slot back to available pool */ | |
998 | static inline void put_recv_comp_slot(struct netvsc_device *nvdev, u16 q_idx) | |
999 | { | |
b8b835a8 | 1000 | struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc; |
c0b558e5 HZ |
1001 | int num_recv; |
1002 | ||
b8b835a8 | 1003 | mrc->first = (mrc->first + 1) % NETVSC_RECVSLOT_MAX; |
c0b558e5 HZ |
1004 | |
1005 | num_recv = atomic_dec_return(&nvdev->num_outstanding_recvs); | |
1006 | ||
1007 | if (nvdev->destroy && num_recv == 0) | |
1008 | wake_up(&nvdev->wait_drain); | |
1009 | } | |
1010 | ||
1011 | /* Check and send pending recv completions */ | |
1012 | static void netvsc_chk_recv_comp(struct netvsc_device *nvdev, | |
1013 | struct vmbus_channel *channel, u16 q_idx) | |
1014 | { | |
1015 | struct recv_comp_data *rcd; | |
1016 | int ret; | |
1017 | ||
1018 | while (true) { | |
1019 | rcd = read_recv_comp_slot(nvdev, q_idx); | |
1020 | if (!rcd) | |
1021 | break; | |
1022 | ||
1023 | ret = netvsc_send_recv_completion(channel, rcd->tid, | |
1024 | rcd->status); | |
1025 | if (ret) | |
1026 | break; | |
1027 | ||
1028 | put_recv_comp_slot(nvdev, q_idx); | |
5fa9d3c5 HZ |
1029 | } |
1030 | } | |
1031 | ||
c0b558e5 HZ |
1032 | #define NETVSC_RCD_WATERMARK 80 |
1033 | ||
1034 | /* Get next available slot */ | |
1035 | static inline struct recv_comp_data *get_recv_comp_slot( | |
1036 | struct netvsc_device *nvdev, struct vmbus_channel *channel, u16 q_idx) | |
1037 | { | |
b8b835a8 | 1038 | struct multi_recv_comp *mrc = &nvdev->chan_table[q_idx].mrc; |
c0b558e5 HZ |
1039 | u32 filled, avail, next; |
1040 | struct recv_comp_data *rcd; | |
1041 | ||
b8b835a8 | 1042 | if (unlikely(!nvdev->recv_section)) |
c0b558e5 HZ |
1043 | return NULL; |
1044 | ||
b8b835a8 | 1045 | if (unlikely(!mrc->buf)) |
c0b558e5 HZ |
1046 | return NULL; |
1047 | ||
1048 | if (atomic_read(&nvdev->num_outstanding_recvs) > | |
1049 | nvdev->recv_section->num_sub_allocs * NETVSC_RCD_WATERMARK / 100) | |
1050 | netvsc_chk_recv_comp(nvdev, channel, q_idx); | |
1051 | ||
1052 | count_recv_comp_slot(nvdev, q_idx, &filled, &avail); | |
1053 | if (!avail) | |
1054 | return NULL; | |
1055 | ||
b8b835a8 | 1056 | next = mrc->next; |
1057 | rcd = mrc->buf + next * sizeof(struct recv_comp_data); | |
1058 | mrc->next = (next + 1) % NETVSC_RECVSLOT_MAX; | |
c0b558e5 HZ |
1059 | |
1060 | atomic_inc(&nvdev->num_outstanding_recvs); | |
1061 | ||
1062 | return rcd; | |
1063 | } | |
1064 | ||
15a863bf | 1065 | static int netvsc_receive(struct net_device *ndev, |
dc54a08c | 1066 | struct netvsc_device *net_device, |
1067 | struct net_device_context *net_device_ctx, | |
1068 | struct hv_device *device, | |
1069 | struct vmbus_channel *channel, | |
f3dd3f47 | 1070 | const struct vmpacket_descriptor *desc, |
dc54a08c | 1071 | struct nvsp_message *nvsp) |
fceaf24a | 1072 | { |
f3dd3f47 | 1073 | const struct vmtransfer_page_packet_header *vmxferpage_packet |
1074 | = container_of(desc, const struct vmtransfer_page_packet_header, d); | |
15a863bf | 1075 | u16 q_idx = channel->offermsg.offer.sub_channel_index; |
dc54a08c | 1076 | char *recv_buf = net_device->recv_buf; |
4baab261 | 1077 | u32 status = NVSP_STAT_SUCCESS; |
45326342 HZ |
1078 | int i; |
1079 | int count = 0; | |
c0b558e5 | 1080 | int ret; |
779b4d17 | 1081 | |
454f18a9 | 1082 | /* Make sure this is a valid nvsp packet */ |
dc54a08c | 1083 | if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { |
1084 | netif_err(net_device_ctx, rx_err, ndev, | |
1085 | "Unknown nvsp packet type received %u\n", | |
1086 | nvsp->hdr.msg_type); | |
15a863bf | 1087 | return 0; |
fceaf24a HJ |
1088 | } |
1089 | ||
dc54a08c | 1090 | if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { |
1091 | netif_err(net_device_ctx, rx_err, ndev, | |
1092 | "Invalid xfer page set id - expecting %x got %x\n", | |
1093 | NETVSC_RECEIVE_BUFFER_ID, | |
1094 | vmxferpage_packet->xfer_pageset_id); | |
15a863bf | 1095 | return 0; |
fceaf24a HJ |
1096 | } |
1097 | ||
4baab261 | 1098 | count = vmxferpage_packet->range_cnt; |
fceaf24a | 1099 | |
454f18a9 | 1100 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
4baab261 | 1101 | for (i = 0; i < count; i++) { |
dc54a08c | 1102 | void *data = recv_buf |
1103 | + vmxferpage_packet->ranges[i].byte_offset; | |
1104 | u32 buflen = vmxferpage_packet->ranges[i].byte_count; | |
fceaf24a | 1105 | |
454f18a9 | 1106 | /* Pass it to the upper layer */ |
dc54a08c | 1107 | status = rndis_filter_receive(ndev, net_device, device, |
1108 | channel, data, buflen); | |
fceaf24a HJ |
1109 | } |
1110 | ||
15a863bf | 1111 | if (net_device->chan_table[q_idx].mrc.buf) { |
1112 | struct recv_comp_data *rcd; | |
1113 | ||
1114 | rcd = get_recv_comp_slot(net_device, channel, q_idx); | |
1115 | if (rcd) { | |
1116 | rcd->tid = vmxferpage_packet->d.trans_id; | |
1117 | rcd->status = status; | |
1118 | } else { | |
1119 | netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", | |
1120 | q_idx, vmxferpage_packet->d.trans_id); | |
1121 | } | |
1122 | } else { | |
c0b558e5 HZ |
1123 | ret = netvsc_send_recv_completion(channel, |
1124 | vmxferpage_packet->d.trans_id, | |
1125 | status); | |
1126 | if (ret) | |
1127 | netdev_err(ndev, "Recv_comp q:%hd, tid:%llx, err:%d\n", | |
1128 | q_idx, vmxferpage_packet->d.trans_id, ret); | |
c0b558e5 | 1129 | } |
15a863bf | 1130 | return count; |
fceaf24a HJ |
1131 | } |
1132 | ||
5b54dac8 | 1133 | static void netvsc_send_table(struct hv_device *hdev, |
71790a27 | 1134 | struct nvsp_message *nvmsg) |
5b54dac8 | 1135 | { |
0a1275ca | 1136 | struct net_device *ndev = hv_get_drvdata(hdev); |
7ce10124 | 1137 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
5b54dac8 HZ |
1138 | int i; |
1139 | u32 count, *tab; | |
1140 | ||
5b54dac8 HZ |
1141 | count = nvmsg->msg.v5_msg.send_table.count; |
1142 | if (count != VRSS_SEND_TAB_SIZE) { | |
1143 | netdev_err(ndev, "Received wrong send-table size:%u\n", count); | |
1144 | return; | |
1145 | } | |
1146 | ||
1147 | tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + | |
1148 | nvmsg->msg.v5_msg.send_table.offset); | |
1149 | ||
1150 | for (i = 0; i < count; i++) | |
7ce10124 | 1151 | net_device_ctx->tx_send_table[i] = tab[i]; |
5b54dac8 HZ |
1152 | } |
1153 | ||
f9a7da91 | 1154 | static void netvsc_send_vf(struct net_device_context *net_device_ctx, |
71790a27 HZ |
1155 | struct nvsp_message *nvmsg) |
1156 | { | |
f9a7da91 VK |
1157 | net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; |
1158 | net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; | |
71790a27 HZ |
1159 | } |
1160 | ||
1161 | static inline void netvsc_receive_inband(struct hv_device *hdev, | |
f9a7da91 VK |
1162 | struct net_device_context *net_device_ctx, |
1163 | struct nvsp_message *nvmsg) | |
71790a27 HZ |
1164 | { |
1165 | switch (nvmsg->hdr.msg_type) { | |
1166 | case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: | |
1167 | netvsc_send_table(hdev, nvmsg); | |
1168 | break; | |
1169 | ||
1170 | case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: | |
f9a7da91 | 1171 | netvsc_send_vf(net_device_ctx, nvmsg); |
71790a27 HZ |
1172 | break; |
1173 | } | |
1174 | } | |
1175 | ||
15a863bf | 1176 | static int netvsc_process_raw_pkt(struct hv_device *device, |
1177 | struct vmbus_channel *channel, | |
1178 | struct netvsc_device *net_device, | |
1179 | struct net_device *ndev, | |
f9645430 | 1180 | const struct vmpacket_descriptor *desc, |
1181 | int budget) | |
99a50bb1 | 1182 | { |
f9a7da91 | 1183 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
f3dd3f47 | 1184 | struct nvsp_message *nvmsg = hv_pkt_data(desc); |
99a50bb1 S |
1185 | |
1186 | switch (desc->type) { | |
1187 | case VM_PKT_COMP: | |
f9645430 | 1188 | netvsc_send_completion(net_device, channel, device, |
1189 | desc, budget); | |
99a50bb1 S |
1190 | break; |
1191 | ||
1192 | case VM_PKT_DATA_USING_XFER_PAGES: | |
15a863bf | 1193 | return netvsc_receive(ndev, net_device, net_device_ctx, |
1194 | device, channel, desc, nvmsg); | |
99a50bb1 S |
1195 | break; |
1196 | ||
1197 | case VM_PKT_DATA_INBAND: | |
f9a7da91 | 1198 | netvsc_receive_inband(device, net_device_ctx, nvmsg); |
99a50bb1 S |
1199 | break; |
1200 | ||
1201 | default: | |
1202 | netdev_err(ndev, "unhandled packet type %d, tid %llx\n", | |
f4f1c23d | 1203 | desc->type, desc->trans_id); |
99a50bb1 S |
1204 | break; |
1205 | } | |
15a863bf | 1206 | |
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) | |
1211 | { | |
1212 | struct vmbus_channel *primary = channel->primary_channel; | |
1213 | ||
1214 | return primary ? primary->device_obj : channel->device_obj; | |
1215 | } | |
1216 | ||
262b7f14 | 1217 | /* Network processing softirq |
1218 | * Process data in incoming ring buffer from host | |
1219 | * Stops when ring is empty or budget is met or exceeded. | |
1220 | */ | |
15a863bf | 1221 | int netvsc_poll(struct napi_struct *napi, int budget) |
1222 | { | |
1223 | struct netvsc_channel *nvchan | |
1224 | = container_of(napi, struct netvsc_channel, napi); | |
1225 | struct vmbus_channel *channel = nvchan->channel; | |
1226 | struct hv_device *device = netvsc_channel_to_device(channel); | |
1227 | u16 q_idx = channel->offermsg.offer.sub_channel_index; | |
1228 | struct net_device *ndev = hv_get_drvdata(device); | |
1229 | struct netvsc_device *net_device = net_device_to_netvsc_device(ndev); | |
15a863bf | 1230 | int work_done = 0; |
1231 | ||
f4f1c23d | 1232 | /* If starting a new interval */ |
1233 | if (!nvchan->desc) | |
1234 | nvchan->desc = hv_pkt_iter_first(channel); | |
15a863bf | 1235 | |
f4f1c23d | 1236 | while (nvchan->desc && work_done < budget) { |
1237 | work_done += netvsc_process_raw_pkt(device, channel, net_device, | |
f9645430 | 1238 | ndev, nvchan->desc, budget); |
f4f1c23d | 1239 | nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); |
15a863bf | 1240 | } |
15a863bf | 1241 | |
f4f1c23d | 1242 | /* If receive ring was exhausted |
1243 | * and not doing busy poll | |
262b7f14 | 1244 | * then re-enable host interrupts |
1245 | * and reschedule if ring is not empty. | |
1246 | */ | |
15a863bf | 1247 | if (work_done < budget && |
1248 | napi_complete_done(napi, work_done) && | |
1249 | hv_end_read(&channel->inbound) != 0) | |
1250 | napi_reschedule(napi); | |
1251 | ||
1252 | netvsc_chk_recv_comp(net_device, channel, q_idx); | |
f4f1c23d | 1253 | |
1254 | /* Driver may overshoot since multiple packets per descriptor */ | |
1255 | return min(work_done, budget); | |
99a50bb1 S |
1256 | } |
1257 | ||
262b7f14 | 1258 | /* Call back when data is available in host ring buffer. |
1259 | * Processing is deferred until network softirq (NAPI) | |
1260 | */ | |
5b54dac8 | 1261 | void netvsc_channel_cb(void *context) |
fceaf24a | 1262 | { |
6de38af6 | 1263 | struct netvsc_channel *nvchan = context; |
0b307ebd | 1264 | |
f4f1c23d | 1265 | if (napi_schedule_prep(&nvchan->napi)) { |
1266 | /* disable interupts from host */ | |
1267 | hv_begin_read(&nvchan->channel->inbound); | |
0d6dd357 | 1268 | |
f4f1c23d | 1269 | __napi_schedule(&nvchan->napi); |
1270 | } | |
fceaf24a | 1271 | } |
af24ce42 | 1272 | |
b637e023 HZ |
1273 | /* |
1274 | * netvsc_device_add - Callback when the device belonging to this | |
1275 | * driver is added | |
1276 | */ | |
9749fed5 | 1277 | struct netvsc_device *netvsc_device_add(struct hv_device *device, |
1278 | const struct netvsc_device_info *device_info) | |
b637e023 | 1279 | { |
88098834 | 1280 | int i, ret = 0; |
2c7f83ca | 1281 | int ring_size = device_info->ring_size; |
b637e023 | 1282 | struct netvsc_device *net_device; |
88098834 VK |
1283 | struct net_device *ndev = hv_get_drvdata(device); |
1284 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
b637e023 | 1285 | |
88098834 | 1286 | net_device = alloc_net_device(); |
b1c84927 | 1287 | if (!net_device) |
9749fed5 | 1288 | return ERR_PTR(-ENOMEM); |
b637e023 | 1289 | |
5b54dac8 HZ |
1290 | net_device->ring_size = ring_size; |
1291 | ||
15a863bf | 1292 | /* Because the device uses NAPI, all the interrupt batching and |
1293 | * control is done via Net softirq, not the channel handling | |
1294 | */ | |
1295 | set_channel_read_mode(device->channel, HV_CALL_ISR); | |
1296 | ||
bffb1842 S |
1297 | /* If we're reopening the device we may have multiple queues, fill the |
1298 | * chn_table with the default channel to use it before subchannels are | |
1299 | * opened. | |
1300 | * Initialize the channel state before we open; | |
1301 | * we can be interrupted as soon as we open the channel. | |
1302 | */ | |
1303 | ||
1304 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) { | |
1305 | struct netvsc_channel *nvchan = &net_device->chan_table[i]; | |
1306 | ||
1307 | nvchan->channel = device->channel; | |
bffb1842 S |
1308 | } |
1309 | ||
2be0f264 | 1310 | /* Enable NAPI handler before init callbacks */ |
1311 | netif_napi_add(ndev, &net_device->chan_table[0].napi, | |
1312 | netvsc_poll, NAPI_POLL_WEIGHT); | |
1313 | ||
b637e023 | 1314 | /* Open the channel */ |
aae23986 S |
1315 | ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, |
1316 | ring_size * PAGE_SIZE, NULL, 0, | |
6de38af6 | 1317 | netvsc_channel_cb, |
1318 | net_device->chan_table); | |
b637e023 HZ |
1319 | |
1320 | if (ret != 0) { | |
2be0f264 | 1321 | netif_napi_del(&net_device->chan_table[0].napi); |
d9871158 | 1322 | netdev_err(ndev, "unable to open channel: %d\n", ret); |
b637e023 HZ |
1323 | goto cleanup; |
1324 | } | |
1325 | ||
1326 | /* Channel is opened */ | |
93ba2222 | 1327 | netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); |
b637e023 | 1328 | |
15a863bf | 1329 | napi_enable(&net_device->chan_table[0].napi); |
88098834 VK |
1330 | |
1331 | /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is | |
1332 | * populated. | |
1333 | */ | |
545a8e79 | 1334 | rcu_assign_pointer(net_device_ctx->nvdev, net_device); |
5b54dac8 | 1335 | |
b637e023 | 1336 | /* Connect with the NetVsp */ |
95790837 | 1337 | ret = netvsc_connect_vsp(device, net_device); |
b637e023 | 1338 | if (ret != 0) { |
d9871158 | 1339 | netdev_err(ndev, |
c909ebbd | 1340 | "unable to connect to NetVSP - %d\n", ret); |
b637e023 HZ |
1341 | goto close; |
1342 | } | |
1343 | ||
9749fed5 | 1344 | return net_device; |
b637e023 HZ |
1345 | |
1346 | close: | |
76bb5db5 | 1347 | netif_napi_del(&net_device->chan_table[0].napi); |
15a863bf | 1348 | |
b637e023 HZ |
1349 | /* Now, we can close the channel safely */ |
1350 | vmbus_close(device->channel); | |
1351 | ||
1352 | cleanup: | |
545a8e79 | 1353 | free_netvsc_device(&net_device->rcu); |
b637e023 | 1354 | |
9749fed5 | 1355 | return ERR_PTR(ret); |
b637e023 | 1356 | } |