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> |
43bf99ce | 33 | #include <linux/prefetch.h> |
a7f99d0f | 34 | #include <linux/reciprocal_div.h> |
9749fed5 | 35 | |
c25aaf81 | 36 | #include <asm/sync_bitops.h> |
3f335ea2 | 37 | |
5ca7252a | 38 | #include "hyperv_net.h" |
ec966381 | 39 | #include "netvsc_trace.h" |
fceaf24a | 40 | |
84bf9cef KS |
41 | /* |
42 | * Switch the data path from the synthetic interface to the VF | |
43 | * interface. | |
44 | */ | |
0a1275ca | 45 | void netvsc_switch_datapath(struct net_device *ndev, bool vf) |
84bf9cef | 46 | { |
3d541ac5 VK |
47 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
48 | struct hv_device *dev = net_device_ctx->device_ctx; | |
79e8cbe7 | 49 | struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); |
0a1275ca | 50 | struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; |
84bf9cef KS |
51 | |
52 | memset(init_pkt, 0, sizeof(struct nvsp_message)); | |
53 | init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; | |
54 | if (vf) | |
55 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
56 | NVSP_DATAPATH_VF; | |
57 | else | |
58 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
59 | NVSP_DATAPATH_SYNTHETIC; | |
60 | ||
ec966381 SH |
61 | trace_nvsp_send(ndev, init_pkt); |
62 | ||
84bf9cef KS |
63 | vmbus_sendpacket(dev->channel, init_pkt, |
64 | sizeof(struct nvsp_message), | |
65 | (unsigned long)init_pkt, | |
66 | VM_PKT_DATA_INBAND, 0); | |
67 | } | |
68 | ||
88098834 | 69 | static struct netvsc_device *alloc_net_device(void) |
fceaf24a | 70 | { |
85799a37 | 71 | struct netvsc_device *net_device; |
fceaf24a | 72 | |
85799a37 HZ |
73 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
74 | if (!net_device) | |
fceaf24a HJ |
75 | return NULL; |
76 | ||
dc5cd894 | 77 | init_waitqueue_head(&net_device->wait_drain); |
c38b9c71 | 78 | net_device->destroy = false; |
0da6edbd | 79 | |
7c3877f2 HZ |
80 | net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; |
81 | net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; | |
8b532797 | 82 | |
fd612602 | 83 | init_completion(&net_device->channel_init_wait); |
732e4985 | 84 | init_waitqueue_head(&net_device->subchan_open); |
8195b139 | 85 | INIT_WORK(&net_device->subchan_work, rndis_set_subchannel); |
7c3877f2 | 86 | |
85799a37 | 87 | return net_device; |
fceaf24a HJ |
88 | } |
89 | ||
545a8e79 | 90 | static void free_netvsc_device(struct rcu_head *head) |
f90251c8 | 91 | { |
545a8e79 | 92 | struct netvsc_device *nvdev |
93 | = container_of(head, struct netvsc_device, rcu); | |
c0b558e5 HZ |
94 | int i; |
95 | ||
02400fce SH |
96 | kfree(nvdev->extension); |
97 | vfree(nvdev->recv_buf); | |
98 | vfree(nvdev->send_buf); | |
99 | kfree(nvdev->send_section_map); | |
100 | ||
c0b558e5 | 101 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) |
7426b1a5 | 102 | vfree(nvdev->chan_table[i].mrc.slots); |
c0b558e5 | 103 | |
f90251c8 HZ |
104 | kfree(nvdev); |
105 | } | |
106 | ||
545a8e79 | 107 | static void free_netvsc_device_rcu(struct netvsc_device *nvdev) |
108 | { | |
109 | call_rcu(&nvdev->rcu, free_netvsc_device); | |
110 | } | |
fceaf24a | 111 | |
7992894c | 112 | static void netvsc_revoke_recv_buf(struct hv_device *device, |
3f076eff MG |
113 | struct netvsc_device *net_device, |
114 | struct net_device *ndev) | |
ec91cd09 | 115 | { |
7992894c | 116 | struct nvsp_message *revoke_packet; |
7a2a0a84 | 117 | int ret; |
ec91cd09 HZ |
118 | |
119 | /* | |
120 | * If we got a section count, it means we received a | |
121 | * SendReceiveBufferComplete msg (ie sent | |
122 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
123 | * to send a revoke msg here | |
124 | */ | |
125 | if (net_device->recv_section_cnt) { | |
126 | /* Send the revoke receive buffer */ | |
127 | revoke_packet = &net_device->revoke_packet; | |
128 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
129 | ||
130 | revoke_packet->hdr.msg_type = | |
131 | NVSP_MSG1_TYPE_REVOKE_RECV_BUF; | |
132 | revoke_packet->msg.v1_msg. | |
133 | revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
134 | ||
ec966381 SH |
135 | trace_nvsp_send(ndev, revoke_packet); |
136 | ||
3d541ac5 | 137 | ret = vmbus_sendpacket(device->channel, |
ec91cd09 HZ |
138 | revoke_packet, |
139 | sizeof(struct nvsp_message), | |
140 | (unsigned long)revoke_packet, | |
141 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
142 | /* If the failure is because the channel is rescinded; |
143 | * ignore the failure since we cannot send on a rescinded | |
144 | * channel. This would allow us to properly cleanup | |
145 | * even when the channel is rescinded. | |
146 | */ | |
147 | if (device->channel->rescind) | |
148 | ret = 0; | |
ec91cd09 HZ |
149 | /* |
150 | * If we failed here, we might as well return and | |
151 | * have a leak rather than continue and a bugchk | |
152 | */ | |
153 | if (ret != 0) { | |
d9871158 | 154 | netdev_err(ndev, "unable to send " |
c909ebbd | 155 | "revoke receive buffer to netvsp\n"); |
7a2a0a84 | 156 | return; |
ec91cd09 | 157 | } |
8b532797 | 158 | net_device->recv_section_cnt = 0; |
ec91cd09 | 159 | } |
7992894c MG |
160 | } |
161 | ||
162 | static void netvsc_revoke_send_buf(struct hv_device *device, | |
3f076eff MG |
163 | struct netvsc_device *net_device, |
164 | struct net_device *ndev) | |
7992894c | 165 | { |
7992894c MG |
166 | struct nvsp_message *revoke_packet; |
167 | int ret; | |
ec91cd09 | 168 | |
c25aaf81 KS |
169 | /* Deal with the send buffer we may have setup. |
170 | * If we got a send section size, it means we received a | |
c51ed182 HZ |
171 | * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent |
172 | * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need | |
c25aaf81 KS |
173 | * to send a revoke msg here |
174 | */ | |
8b532797 | 175 | if (net_device->send_section_cnt) { |
c25aaf81 KS |
176 | /* Send the revoke receive buffer */ |
177 | revoke_packet = &net_device->revoke_packet; | |
178 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
179 | ||
180 | revoke_packet->hdr.msg_type = | |
181 | NVSP_MSG1_TYPE_REVOKE_SEND_BUF; | |
c51ed182 HZ |
182 | revoke_packet->msg.v1_msg.revoke_send_buf.id = |
183 | NETVSC_SEND_BUFFER_ID; | |
c25aaf81 | 184 | |
ec966381 SH |
185 | trace_nvsp_send(ndev, revoke_packet); |
186 | ||
3d541ac5 | 187 | ret = vmbus_sendpacket(device->channel, |
c25aaf81 KS |
188 | revoke_packet, |
189 | sizeof(struct nvsp_message), | |
190 | (unsigned long)revoke_packet, | |
191 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
192 | |
193 | /* If the failure is because the channel is rescinded; | |
194 | * ignore the failure since we cannot send on a rescinded | |
195 | * channel. This would allow us to properly cleanup | |
196 | * even when the channel is rescinded. | |
197 | */ | |
198 | if (device->channel->rescind) | |
199 | ret = 0; | |
200 | ||
c25aaf81 KS |
201 | /* If we failed here, we might as well return and |
202 | * have a leak rather than continue and a bugchk | |
203 | */ | |
204 | if (ret != 0) { | |
205 | netdev_err(ndev, "unable to send " | |
206 | "revoke send buffer to netvsp\n"); | |
7a2a0a84 | 207 | return; |
c25aaf81 | 208 | } |
8b532797 | 209 | net_device->send_section_cnt = 0; |
c25aaf81 | 210 | } |
0cf73780 VK |
211 | } |
212 | ||
7992894c | 213 | static void netvsc_teardown_recv_gpadl(struct hv_device *device, |
3f076eff MG |
214 | struct netvsc_device *net_device, |
215 | struct net_device *ndev) | |
0cf73780 | 216 | { |
0cf73780 VK |
217 | int ret; |
218 | ||
219 | if (net_device->recv_buf_gpadl_handle) { | |
220 | ret = vmbus_teardown_gpadl(device->channel, | |
221 | net_device->recv_buf_gpadl_handle); | |
222 | ||
223 | /* If we failed here, we might as well return and have a leak | |
224 | * rather than continue and a bugchk | |
225 | */ | |
226 | if (ret != 0) { | |
227 | netdev_err(ndev, | |
228 | "unable to teardown receive buffer's gpadl\n"); | |
229 | return; | |
230 | } | |
231 | net_device->recv_buf_gpadl_handle = 0; | |
232 | } | |
7992894c MG |
233 | } |
234 | ||
235 | static void netvsc_teardown_send_gpadl(struct hv_device *device, | |
3f076eff MG |
236 | struct netvsc_device *net_device, |
237 | struct net_device *ndev) | |
7992894c | 238 | { |
7992894c | 239 | int ret; |
0cf73780 | 240 | |
c25aaf81 | 241 | if (net_device->send_buf_gpadl_handle) { |
3d541ac5 | 242 | ret = vmbus_teardown_gpadl(device->channel, |
c25aaf81 KS |
243 | net_device->send_buf_gpadl_handle); |
244 | ||
245 | /* If we failed here, we might as well return and have a leak | |
246 | * rather than continue and a bugchk | |
247 | */ | |
248 | if (ret != 0) { | |
249 | netdev_err(ndev, | |
250 | "unable to teardown send buffer's gpadl\n"); | |
7a2a0a84 | 251 | return; |
c25aaf81 | 252 | } |
2f18423d | 253 | net_device->send_buf_gpadl_handle = 0; |
c25aaf81 | 254 | } |
ec91cd09 HZ |
255 | } |
256 | ||
7426b1a5 | 257 | int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) |
258 | { | |
259 | struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; | |
260 | int node = cpu_to_node(nvchan->channel->target_cpu); | |
261 | size_t size; | |
262 | ||
263 | size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); | |
264 | nvchan->mrc.slots = vzalloc_node(size, node); | |
265 | if (!nvchan->mrc.slots) | |
266 | nvchan->mrc.slots = vzalloc(size); | |
267 | ||
268 | return nvchan->mrc.slots ? 0 : -ENOMEM; | |
269 | } | |
270 | ||
95790837 | 271 | static int netvsc_init_buf(struct hv_device *device, |
8b532797 | 272 | struct netvsc_device *net_device, |
273 | const struct netvsc_device_info *device_info) | |
fceaf24a | 274 | { |
7426b1a5 | 275 | struct nvsp_1_message_send_receive_buffer_complete *resp; |
95833370 | 276 | struct net_device *ndev = hv_get_drvdata(device); |
277 | struct nvsp_message *init_packet; | |
8b532797 | 278 | unsigned int buf_size; |
fdfb70d2 | 279 | size_t map_words; |
95833370 | 280 | int ret = 0; |
0a726c2b | 281 | |
8b532797 | 282 | /* Get receive buffer area. */ |
0ab09bef | 283 | buf_size = device_info->recv_sections * device_info->recv_section_size; |
8b532797 | 284 | buf_size = roundup(buf_size, PAGE_SIZE); |
285 | ||
11b2b653 HZ |
286 | /* Legacy hosts only allow smaller receive buffer */ |
287 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) | |
288 | buf_size = min_t(unsigned int, buf_size, | |
289 | NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); | |
290 | ||
8b532797 | 291 | net_device->recv_buf = vzalloc(buf_size); |
53d21fdb | 292 | if (!net_device->recv_buf) { |
8b532797 | 293 | netdev_err(ndev, |
294 | "unable to allocate receive buffer of size %u\n", | |
295 | buf_size); | |
927bc33c | 296 | ret = -ENOMEM; |
0c3b7b2f | 297 | goto cleanup; |
fceaf24a | 298 | } |
fceaf24a | 299 | |
c5d24bdd HZ |
300 | net_device->recv_buf_size = buf_size; |
301 | ||
454f18a9 BP |
302 | /* |
303 | * Establish the gpadl handle for this buffer on this | |
304 | * channel. Note: This call uses the vmbus connection rather | |
305 | * than the channel to establish the gpadl handle. | |
306 | */ | |
53d21fdb | 307 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
8b532797 | 308 | buf_size, |
53d21fdb | 309 | &net_device->recv_buf_gpadl_handle); |
21a80820 | 310 | if (ret != 0) { |
d9871158 | 311 | netdev_err(ndev, |
c909ebbd | 312 | "unable to establish receive buffer's gpadl\n"); |
0c3b7b2f | 313 | goto cleanup; |
fceaf24a HJ |
314 | } |
315 | ||
454f18a9 | 316 | /* Notify the NetVsp of the gpadl handle */ |
53d21fdb | 317 | init_packet = &net_device->channel_init_pkt; |
85799a37 | 318 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb HZ |
319 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
320 | init_packet->msg.v1_msg.send_recv_buf. | |
321 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
322 | init_packet->msg.v1_msg. | |
323 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 324 | |
ec966381 SH |
325 | trace_nvsp_send(ndev, init_packet); |
326 | ||
454f18a9 | 327 | /* Send the gpadl notification request */ |
85799a37 | 328 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 329 | sizeof(struct nvsp_message), |
85799a37 | 330 | (unsigned long)init_packet, |
415f2287 | 331 | VM_PKT_DATA_INBAND, |
5a4df290 | 332 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 333 | if (ret != 0) { |
d9871158 | 334 | netdev_err(ndev, |
c909ebbd | 335 | "unable to send receive buffer's gpadl to netvsp\n"); |
0c3b7b2f | 336 | goto cleanup; |
fceaf24a HJ |
337 | } |
338 | ||
5362855a | 339 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 340 | |
454f18a9 | 341 | /* Check the response */ |
7426b1a5 | 342 | resp = &init_packet->msg.v1_msg.send_recv_buf_complete; |
343 | if (resp->status != NVSP_STAT_SUCCESS) { | |
344 | netdev_err(ndev, | |
345 | "Unable to complete receive buffer initialization with NetVsp - status %d\n", | |
346 | resp->status); | |
927bc33c | 347 | ret = -EINVAL; |
0c3b7b2f | 348 | goto cleanup; |
fceaf24a HJ |
349 | } |
350 | ||
454f18a9 | 351 | /* Parse the response */ |
7426b1a5 | 352 | netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", |
353 | resp->num_sections, resp->sections[0].sub_alloc_size, | |
354 | resp->sections[0].num_sub_allocs); | |
fceaf24a | 355 | |
8b532797 | 356 | /* There should only be one section for the entire receive buffer */ |
357 | if (resp->num_sections != 1 || resp->sections[0].offset != 0) { | |
927bc33c | 358 | ret = -EINVAL; |
0c3b7b2f | 359 | goto cleanup; |
fceaf24a HJ |
360 | } |
361 | ||
8b532797 | 362 | net_device->recv_section_size = resp->sections[0].sub_alloc_size; |
363 | net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; | |
364 | ||
7426b1a5 | 365 | /* Setup receive completion ring */ |
366 | net_device->recv_completion_cnt | |
8b532797 | 367 | = round_up(net_device->recv_section_cnt + 1, |
7426b1a5 | 368 | PAGE_SIZE / sizeof(u64)); |
369 | ret = netvsc_alloc_recv_comp_ring(net_device, 0); | |
370 | if (ret) | |
371 | goto cleanup; | |
372 | ||
373 | /* Now setup the send buffer. */ | |
0ab09bef | 374 | buf_size = device_info->send_sections * device_info->send_section_size; |
8b532797 | 375 | buf_size = round_up(buf_size, PAGE_SIZE); |
376 | ||
377 | net_device->send_buf = vzalloc(buf_size); | |
c25aaf81 | 378 | if (!net_device->send_buf) { |
8b532797 | 379 | netdev_err(ndev, "unable to allocate send buffer of size %u\n", |
380 | buf_size); | |
c25aaf81 KS |
381 | ret = -ENOMEM; |
382 | goto cleanup; | |
383 | } | |
384 | ||
385 | /* Establish the gpadl handle for this buffer on this | |
386 | * channel. Note: This call uses the vmbus connection rather | |
387 | * than the channel to establish the gpadl handle. | |
388 | */ | |
389 | ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, | |
8b532797 | 390 | buf_size, |
c25aaf81 KS |
391 | &net_device->send_buf_gpadl_handle); |
392 | if (ret != 0) { | |
393 | netdev_err(ndev, | |
394 | "unable to establish send buffer's gpadl\n"); | |
395 | goto cleanup; | |
396 | } | |
397 | ||
398 | /* Notify the NetVsp of the gpadl handle */ | |
399 | init_packet = &net_device->channel_init_pkt; | |
400 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
401 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; | |
c51ed182 | 402 | init_packet->msg.v1_msg.send_send_buf.gpadl_handle = |
c25aaf81 | 403 | net_device->send_buf_gpadl_handle; |
c51ed182 | 404 | init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; |
c25aaf81 | 405 | |
ec966381 SH |
406 | trace_nvsp_send(ndev, init_packet); |
407 | ||
c25aaf81 KS |
408 | /* Send the gpadl notification request */ |
409 | ret = vmbus_sendpacket(device->channel, init_packet, | |
410 | sizeof(struct nvsp_message), | |
411 | (unsigned long)init_packet, | |
412 | VM_PKT_DATA_INBAND, | |
413 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
414 | if (ret != 0) { | |
415 | netdev_err(ndev, | |
416 | "unable to send send buffer's gpadl to netvsp\n"); | |
417 | goto cleanup; | |
418 | } | |
419 | ||
5362855a | 420 | wait_for_completion(&net_device->channel_init_wait); |
c25aaf81 KS |
421 | |
422 | /* Check the response */ | |
423 | if (init_packet->msg.v1_msg. | |
424 | send_send_buf_complete.status != NVSP_STAT_SUCCESS) { | |
425 | netdev_err(ndev, "Unable to complete send buffer " | |
426 | "initialization with NetVsp - status %d\n", | |
427 | init_packet->msg.v1_msg. | |
c51ed182 | 428 | send_send_buf_complete.status); |
c25aaf81 KS |
429 | ret = -EINVAL; |
430 | goto cleanup; | |
431 | } | |
432 | ||
433 | /* Parse the response */ | |
434 | net_device->send_section_size = init_packet->msg. | |
435 | v1_msg.send_send_buf_complete.section_size; | |
436 | ||
8b532797 | 437 | /* Section count is simply the size divided by the section size. */ |
438 | net_device->send_section_cnt = buf_size / net_device->send_section_size; | |
c25aaf81 | 439 | |
93ba2222 VK |
440 | netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", |
441 | net_device->send_section_size, net_device->send_section_cnt); | |
c25aaf81 KS |
442 | |
443 | /* Setup state for managing the send buffer. */ | |
fdfb70d2 | 444 | map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); |
c25aaf81 | 445 | |
fdfb70d2 | 446 | net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); |
dd1d3f8f WY |
447 | if (net_device->send_section_map == NULL) { |
448 | ret = -ENOMEM; | |
c25aaf81 | 449 | goto cleanup; |
dd1d3f8f | 450 | } |
c25aaf81 | 451 | |
0c3b7b2f | 452 | goto exit; |
fceaf24a | 453 | |
0c3b7b2f | 454 | cleanup: |
3f076eff MG |
455 | netvsc_revoke_recv_buf(device, net_device, ndev); |
456 | netvsc_revoke_send_buf(device, net_device, ndev); | |
457 | netvsc_teardown_recv_gpadl(device, net_device, ndev); | |
458 | netvsc_teardown_send_gpadl(device, net_device, ndev); | |
fceaf24a | 459 | |
0c3b7b2f | 460 | exit: |
fceaf24a HJ |
461 | return ret; |
462 | } | |
463 | ||
f157e78d HZ |
464 | /* Negotiate NVSP protocol version */ |
465 | static int negotiate_nvsp_ver(struct hv_device *device, | |
466 | struct netvsc_device *net_device, | |
467 | struct nvsp_message *init_packet, | |
468 | u32 nvsp_ver) | |
fceaf24a | 469 | { |
0a1275ca | 470 | struct net_device *ndev = hv_get_drvdata(device); |
7390fe9c | 471 | int ret; |
fceaf24a | 472 | |
85799a37 | 473 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb | 474 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
f157e78d HZ |
475 | init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; |
476 | init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; | |
ec966381 SH |
477 | trace_nvsp_send(ndev, init_packet); |
478 | ||
454f18a9 | 479 | /* Send the init request */ |
85799a37 | 480 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 481 | sizeof(struct nvsp_message), |
85799a37 | 482 | (unsigned long)init_packet, |
415f2287 | 483 | VM_PKT_DATA_INBAND, |
5a4df290 | 484 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 485 | |
b8a3d52b | 486 | if (ret != 0) |
f157e78d | 487 | return ret; |
fceaf24a | 488 | |
5362855a | 489 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 490 | |
53d21fdb | 491 | if (init_packet->msg.init_msg.init_complete.status != |
f157e78d HZ |
492 | NVSP_STAT_SUCCESS) |
493 | return -EINVAL; | |
fceaf24a | 494 | |
a1eabb01 | 495 | if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
f157e78d HZ |
496 | return 0; |
497 | ||
71790a27 | 498 | /* NVSPv2 or later: Send NDIS config */ |
f157e78d HZ |
499 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
500 | init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; | |
0a1275ca | 501 | init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; |
1f5f3a75 | 502 | init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
f157e78d | 503 | |
7f5d5af0 | 504 | if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { |
71790a27 HZ |
505 | init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; |
506 | ||
7f5d5af0 HZ |
507 | /* Teaming bit is needed to receive link speed updates */ |
508 | init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; | |
509 | } | |
510 | ||
ec966381 SH |
511 | trace_nvsp_send(ndev, init_packet); |
512 | ||
f157e78d HZ |
513 | ret = vmbus_sendpacket(device->channel, init_packet, |
514 | sizeof(struct nvsp_message), | |
515 | (unsigned long)init_packet, | |
516 | VM_PKT_DATA_INBAND, 0); | |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
95790837 | 521 | static int netvsc_connect_vsp(struct hv_device *device, |
8b532797 | 522 | struct netvsc_device *net_device, |
523 | const struct netvsc_device_info *device_info) | |
f157e78d | 524 | { |
ec966381 | 525 | struct net_device *ndev = hv_get_drvdata(device); |
1b17ca04 | 526 | static const u32 ver_list[] = { |
e5a78fad | 527 | NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, |
95790837 | 528 | NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 |
529 | }; | |
530 | struct nvsp_message *init_packet; | |
531 | int ndis_version, i, ret; | |
f157e78d HZ |
532 | |
533 | init_packet = &net_device->channel_init_pkt; | |
534 | ||
535 | /* Negotiate the latest NVSP protocol supported */ | |
e5a78fad | 536 | for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) |
a1eabb01 HZ |
537 | if (negotiate_nvsp_ver(device, net_device, init_packet, |
538 | ver_list[i]) == 0) { | |
539 | net_device->nvsp_version = ver_list[i]; | |
540 | break; | |
541 | } | |
542 | ||
543 | if (i < 0) { | |
0f48c72c | 544 | ret = -EPROTO; |
0c3b7b2f | 545 | goto cleanup; |
fceaf24a | 546 | } |
f157e78d HZ |
547 | |
548 | pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); | |
549 | ||
454f18a9 | 550 | /* Send the ndis version */ |
85799a37 | 551 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 552 | |
a1eabb01 | 553 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) |
1f73db49 | 554 | ndis_version = 0x00060001; |
a1eabb01 HZ |
555 | else |
556 | ndis_version = 0x0006001e; | |
fceaf24a | 557 | |
53d21fdb HZ |
558 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
559 | init_packet->msg.v1_msg. | |
560 | send_ndis_ver.ndis_major_ver = | |
85799a37 | 561 | (ndis_version & 0xFFFF0000) >> 16; |
53d21fdb HZ |
562 | init_packet->msg.v1_msg. |
563 | send_ndis_ver.ndis_minor_ver = | |
85799a37 | 564 | ndis_version & 0xFFFF; |
fceaf24a | 565 | |
ec966381 SH |
566 | trace_nvsp_send(ndev, init_packet); |
567 | ||
454f18a9 | 568 | /* Send the init request */ |
85799a37 | 569 | ret = vmbus_sendpacket(device->channel, init_packet, |
0c3b7b2f S |
570 | sizeof(struct nvsp_message), |
571 | (unsigned long)init_packet, | |
572 | VM_PKT_DATA_INBAND, 0); | |
0f48c72c | 573 | if (ret != 0) |
0c3b7b2f | 574 | goto cleanup; |
454f18a9 | 575 | |
99d3016d | 576 | |
8b532797 | 577 | ret = netvsc_init_buf(device, net_device, device_info); |
fceaf24a | 578 | |
0c3b7b2f | 579 | cleanup: |
fceaf24a HJ |
580 | return ret; |
581 | } | |
582 | ||
3e189519 | 583 | /* |
5a71ae30 | 584 | * netvsc_device_remove - Callback when the root bus device is removed |
21a80820 | 585 | */ |
e08f3ea5 | 586 | void netvsc_device_remove(struct hv_device *device) |
fceaf24a | 587 | { |
3d541ac5 VK |
588 | struct net_device *ndev = hv_get_drvdata(device); |
589 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
79e8cbe7 | 590 | struct netvsc_device *net_device |
591 | = rtnl_dereference(net_device_ctx->nvdev); | |
15a863bf | 592 | int i; |
fceaf24a | 593 | |
a56d99d7 MG |
594 | /* |
595 | * Revoke receive buffer. If host is pre-Win2016 then tear down | |
596 | * receive buffer GPADL. Do the same for send buffer. | |
597 | */ | |
3f076eff | 598 | netvsc_revoke_recv_buf(device, net_device, ndev); |
a56d99d7 | 599 | if (vmbus_proto_version < VERSION_WIN10) |
3f076eff | 600 | netvsc_teardown_recv_gpadl(device, net_device, ndev); |
a56d99d7 | 601 | |
3f076eff | 602 | netvsc_revoke_send_buf(device, net_device, ndev); |
a56d99d7 | 603 | if (vmbus_proto_version < VERSION_WIN10) |
3f076eff | 604 | netvsc_teardown_send_gpadl(device, net_device, ndev); |
9d88f33a | 605 | |
545a8e79 | 606 | RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
3852409b | 607 | |
8348e046 SH |
608 | /* And disassociate NAPI context from device */ |
609 | for (i = 0; i < net_device->num_chn; i++) | |
610 | netif_napi_del(&net_device->chan_table[i].napi); | |
611 | ||
86c921af S |
612 | /* |
613 | * At this point, no one should be accessing net_device | |
614 | * except in here | |
615 | */ | |
93ba2222 | 616 | netdev_dbg(ndev, "net device safe to remove\n"); |
fceaf24a | 617 | |
454f18a9 | 618 | /* Now, we can close the channel safely */ |
85799a37 | 619 | vmbus_close(device->channel); |
fceaf24a | 620 | |
a56d99d7 MG |
621 | /* |
622 | * If host is Win2016 or higher then we do the GPADL tear down | |
623 | * here after VMBus is closed. | |
624 | */ | |
7992894c | 625 | if (vmbus_proto_version >= VERSION_WIN10) { |
3f076eff MG |
626 | netvsc_teardown_recv_gpadl(device, net_device, ndev); |
627 | netvsc_teardown_send_gpadl(device, net_device, ndev); | |
7992894c | 628 | } |
15a863bf | 629 | |
454f18a9 | 630 | /* Release all resources */ |
545a8e79 | 631 | free_netvsc_device_rcu(net_device); |
fceaf24a HJ |
632 | } |
633 | ||
33be96e4 HZ |
634 | #define RING_AVAIL_PERCENT_HIWATER 20 |
635 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
636 | ||
637 | /* | |
638 | * Get the percentage of available bytes to write in the ring. | |
639 | * The return value is in range from 0 to 100. | |
640 | */ | |
a7f99d0f | 641 | static u32 hv_ringbuf_avail_percent(const struct hv_ring_buffer_info *ring_info) |
33be96e4 | 642 | { |
a7f99d0f | 643 | u32 avail_write = hv_get_bytes_to_write(ring_info); |
33be96e4 | 644 | |
a7f99d0f | 645 | return reciprocal_divide(avail_write * 100, netvsc_ring_reciprocal); |
33be96e4 HZ |
646 | } |
647 | ||
c25aaf81 KS |
648 | static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
649 | u32 index) | |
650 | { | |
651 | sync_change_bit(index, net_device->send_section_map); | |
652 | } | |
653 | ||
bc304dd3 SH |
654 | static void netvsc_send_tx_complete(struct netvsc_device *net_device, |
655 | struct vmbus_channel *incoming_channel, | |
656 | struct hv_device *device, | |
f9645430 | 657 | const struct vmpacket_descriptor *desc, |
658 | int budget) | |
bc304dd3 | 659 | { |
50698d80 | 660 | struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id; |
bc304dd3 | 661 | struct net_device *ndev = hv_get_drvdata(device); |
09af87d1 | 662 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
bc304dd3 | 663 | struct vmbus_channel *channel = device->channel; |
bc304dd3 SH |
664 | u16 q_idx = 0; |
665 | int queue_sends; | |
666 | ||
667 | /* Notify the layer above us */ | |
668 | if (likely(skb)) { | |
793e3955 | 669 | const struct hv_netvsc_packet *packet |
bc304dd3 | 670 | = (struct hv_netvsc_packet *)skb->cb; |
793e3955 | 671 | u32 send_index = packet->send_buf_index; |
672 | struct netvsc_stats *tx_stats; | |
bc304dd3 SH |
673 | |
674 | if (send_index != NETVSC_INVALID_INDEX) | |
675 | netvsc_free_send_slot(net_device, send_index); | |
793e3955 | 676 | q_idx = packet->q_idx; |
bc304dd3 SH |
677 | channel = incoming_channel; |
678 | ||
6c80f3fc | 679 | tx_stats = &net_device->chan_table[q_idx].tx_stats; |
793e3955 | 680 | |
681 | u64_stats_update_begin(&tx_stats->syncp); | |
682 | tx_stats->packets += packet->total_packets; | |
683 | tx_stats->bytes += packet->total_bytes; | |
684 | u64_stats_update_end(&tx_stats->syncp); | |
685 | ||
f9645430 | 686 | napi_consume_skb(skb, budget); |
bc304dd3 SH |
687 | } |
688 | ||
b8b835a8 | 689 | queue_sends = |
690 | atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); | |
bc304dd3 | 691 | |
7b2ee50c SH |
692 | if (unlikely(net_device->destroy)) { |
693 | if (queue_sends == 0) | |
694 | wake_up(&net_device->wait_drain); | |
695 | } else { | |
696 | struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); | |
697 | ||
698 | if (netif_tx_queue_stopped(txq) && | |
699 | (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER || | |
700 | queue_sends < 1)) { | |
701 | netif_tx_wake_queue(txq); | |
702 | ndev_ctx->eth_stats.wake_queue++; | |
703 | } | |
09af87d1 | 704 | } |
bc304dd3 SH |
705 | } |
706 | ||
97c1723a | 707 | static void netvsc_send_completion(struct netvsc_device *net_device, |
25b85ee8 | 708 | struct vmbus_channel *incoming_channel, |
97c1723a | 709 | struct hv_device *device, |
f9645430 | 710 | const struct vmpacket_descriptor *desc, |
711 | int budget) | |
fceaf24a | 712 | { |
f3dd3f47 | 713 | struct nvsp_message *nvsp_packet = hv_pkt_data(desc); |
3d541ac5 | 714 | struct net_device *ndev = hv_get_drvdata(device); |
fceaf24a | 715 | |
bc304dd3 SH |
716 | switch (nvsp_packet->hdr.msg_type) { |
717 | case NVSP_MSG_TYPE_INIT_COMPLETE: | |
718 | case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: | |
719 | case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: | |
720 | case NVSP_MSG5_TYPE_SUBCHANNEL: | |
454f18a9 | 721 | /* Copy the response back */ |
53d21fdb | 722 | memcpy(&net_device->channel_init_pkt, nvsp_packet, |
21a80820 | 723 | sizeof(struct nvsp_message)); |
35abb21a | 724 | complete(&net_device->channel_init_wait); |
bc304dd3 SH |
725 | break; |
726 | ||
727 | case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: | |
728 | netvsc_send_tx_complete(net_device, incoming_channel, | |
f9645430 | 729 | device, desc, budget); |
bc304dd3 | 730 | break; |
fceaf24a | 731 | |
bc304dd3 SH |
732 | default: |
733 | netdev_err(ndev, | |
734 | "Unknown send completion type %d received!!\n", | |
735 | nvsp_packet->hdr.msg_type); | |
fceaf24a | 736 | } |
fceaf24a HJ |
737 | } |
738 | ||
c25aaf81 KS |
739 | static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
740 | { | |
b58a1858 | 741 | unsigned long *map_addr = net_device->send_section_map; |
742 | unsigned int i; | |
743 | ||
fdfb70d2 | 744 | for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { |
b58a1858 | 745 | if (sync_test_and_set_bit(i, map_addr) == 0) |
746 | return i; | |
c25aaf81 | 747 | } |
b58a1858 | 748 | |
749 | return NETVSC_INVALID_INDEX; | |
c25aaf81 KS |
750 | } |
751 | ||
26a11262 SH |
752 | static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
753 | unsigned int section_index, | |
754 | u32 pend_size, | |
755 | struct hv_netvsc_packet *packet, | |
756 | struct rndis_message *rndis_msg, | |
757 | struct hv_page_buffer *pb, | |
cfd8afd9 | 758 | bool xmit_more) |
c25aaf81 KS |
759 | { |
760 | char *start = net_device->send_buf; | |
7c3877f2 HZ |
761 | char *dest = start + (section_index * net_device->send_section_size) |
762 | + pend_size; | |
c25aaf81 | 763 | int i; |
7c3877f2 | 764 | u32 padding = 0; |
aa0a34be HZ |
765 | u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : |
766 | packet->page_buf_cnt; | |
b85e06f7 | 767 | u32 remain; |
7c3877f2 HZ |
768 | |
769 | /* Add padding */ | |
b85e06f7 | 770 | remain = packet->total_data_buflen & (net_device->pkt_align - 1); |
cfd8afd9 | 771 | if (xmit_more && remain) { |
7c3877f2 | 772 | padding = net_device->pkt_align - remain; |
24476760 | 773 | rndis_msg->msg_len += padding; |
7c3877f2 HZ |
774 | packet->total_data_buflen += padding; |
775 | } | |
c25aaf81 | 776 | |
aa0a34be | 777 | for (i = 0; i < page_count; i++) { |
02b6de01 | 778 | char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT); |
779 | u32 offset = pb[i].offset; | |
780 | u32 len = pb[i].len; | |
c25aaf81 KS |
781 | |
782 | memcpy(dest, (src + offset), len); | |
c25aaf81 KS |
783 | dest += len; |
784 | } | |
7c3877f2 | 785 | |
26a11262 | 786 | if (padding) |
7c3877f2 | 787 | memset(dest, 0, padding); |
c25aaf81 KS |
788 | } |
789 | ||
3a8963ac | 790 | static inline int netvsc_send_pkt( |
0a1275ca | 791 | struct hv_device *device, |
7c3877f2 | 792 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 793 | struct netvsc_device *net_device, |
02b6de01 | 794 | struct hv_page_buffer *pb, |
3a3d9a0a | 795 | struct sk_buff *skb) |
fceaf24a | 796 | { |
7c3877f2 | 797 | struct nvsp_message nvmsg; |
ec966381 | 798 | struct nvsp_1_message_send_rndis_packet *rpkt = |
956a25c9 JP |
799 | &nvmsg.msg.v1_msg.send_rndis_pkt; |
800 | struct netvsc_channel * const nvchan = | |
801 | &net_device->chan_table[packet->q_idx]; | |
b8b835a8 | 802 | struct vmbus_channel *out_channel = nvchan->channel; |
0a1275ca | 803 | struct net_device *ndev = hv_get_drvdata(device); |
09af87d1 | 804 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
b8b835a8 | 805 | struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); |
7c3877f2 HZ |
806 | u64 req_id; |
807 | int ret; | |
82fa3c77 | 808 | u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); |
c25aaf81 | 809 | |
7c3877f2 | 810 | nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
956a25c9 JP |
811 | if (skb) |
812 | rpkt->channel_type = 0; /* 0 is RMC_DATA */ | |
813 | else | |
814 | rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ | |
fceaf24a | 815 | |
956a25c9 | 816 | rpkt->send_buf_section_index = packet->send_buf_index; |
7c3877f2 | 817 | if (packet->send_buf_index == NETVSC_INVALID_INDEX) |
956a25c9 | 818 | rpkt->send_buf_section_size = 0; |
7c3877f2 | 819 | else |
956a25c9 | 820 | rpkt->send_buf_section_size = packet->total_data_buflen; |
21a80820 | 821 | |
3a3d9a0a | 822 | req_id = (ulong)skb; |
f1ea3cd7 | 823 | |
c3582a2c HZ |
824 | if (out_channel->rescind) |
825 | return -ENODEV; | |
826 | ||
ec966381 SH |
827 | trace_nvsp_send_pkt(ndev, out_channel, rpkt); |
828 | ||
72a2f5bd | 829 | if (packet->page_buf_cnt) { |
02b6de01 | 830 | if (packet->cp_partial) |
831 | pb += packet->rmsg_pgcnt; | |
832 | ||
5a668d8c | 833 | ret = vmbus_sendpacket_pagebuffer(out_channel, |
834 | pb, packet->page_buf_cnt, | |
835 | &nvmsg, sizeof(nvmsg), | |
836 | req_id); | |
21a80820 | 837 | } else { |
5dd0fb9b | 838 | ret = vmbus_sendpacket(out_channel, |
839 | &nvmsg, sizeof(nvmsg), | |
840 | req_id, VM_PKT_DATA_INBAND, | |
841 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
fceaf24a HJ |
842 | } |
843 | ||
1d06825b | 844 | if (ret == 0) { |
b8b835a8 | 845 | atomic_inc_return(&nvchan->queue_sends); |
5b54dac8 | 846 | |
09af87d1 | 847 | if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { |
b8b835a8 | 848 | netif_tx_stop_queue(txq); |
09af87d1 SX |
849 | ndev_ctx->eth_stats.stop_queue++; |
850 | } | |
1d06825b | 851 | } else if (ret == -EAGAIN) { |
b8b835a8 | 852 | netif_tx_stop_queue(txq); |
09af87d1 | 853 | ndev_ctx->eth_stats.stop_queue++; |
b8b835a8 | 854 | if (atomic_read(&nvchan->queue_sends) < 1) { |
855 | netif_tx_wake_queue(txq); | |
09af87d1 | 856 | ndev_ctx->eth_stats.wake_queue++; |
33be96e4 HZ |
857 | ret = -ENOSPC; |
858 | } | |
1d06825b | 859 | } else { |
4a2176c6 | 860 | netdev_err(ndev, |
861 | "Unable to send packet pages %u len %u, ret %d\n", | |
862 | packet->page_buf_cnt, packet->total_data_buflen, | |
863 | ret); | |
1d06825b | 864 | } |
fceaf24a | 865 | |
7c3877f2 HZ |
866 | return ret; |
867 | } | |
868 | ||
c85e4924 HZ |
869 | /* Move packet out of multi send data (msd), and clear msd */ |
870 | static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, | |
871 | struct sk_buff **msd_skb, | |
872 | struct multi_send_data *msdp) | |
873 | { | |
874 | *msd_skb = msdp->skb; | |
875 | *msd_send = msdp->pkt; | |
876 | msdp->skb = NULL; | |
877 | msdp->pkt = NULL; | |
878 | msdp->count = 0; | |
879 | } | |
880 | ||
2a926f79 | 881 | /* RCU already held by caller */ |
cfd8afd9 | 882 | int netvsc_send(struct net_device *ndev, |
24476760 | 883 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 884 | struct rndis_message *rndis_msg, |
02b6de01 | 885 | struct hv_page_buffer *pb, |
3a3d9a0a | 886 | struct sk_buff *skb) |
7c3877f2 | 887 | { |
cfd8afd9 | 888 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
3962981f | 889 | struct netvsc_device *net_device |
867047c4 | 890 | = rcu_dereference_bh(ndev_ctx->nvdev); |
2a926f79 | 891 | struct hv_device *device = ndev_ctx->device_ctx; |
6c4c137e | 892 | int ret = 0; |
b8b835a8 | 893 | struct netvsc_channel *nvchan; |
7c3877f2 HZ |
894 | u32 pktlen = packet->total_data_buflen, msd_len = 0; |
895 | unsigned int section_index = NETVSC_INVALID_INDEX; | |
7c3877f2 HZ |
896 | struct multi_send_data *msdp; |
897 | struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; | |
c85e4924 | 898 | struct sk_buff *msd_skb = NULL; |
cfd8afd9 | 899 | bool try_batch, xmit_more; |
7c3877f2 | 900 | |
592b4fe8 | 901 | /* If device is rescinded, return error and packet will get dropped. */ |
2a926f79 | 902 | if (unlikely(!net_device || net_device->destroy)) |
7c3877f2 HZ |
903 | return -ENODEV; |
904 | ||
b8b835a8 | 905 | nvchan = &net_device->chan_table[packet->q_idx]; |
7c3877f2 | 906 | packet->send_buf_index = NETVSC_INVALID_INDEX; |
aa0a34be | 907 | packet->cp_partial = false; |
7c3877f2 | 908 | |
cf8190e4 HZ |
909 | /* Send control message directly without accessing msd (Multi-Send |
910 | * Data) field which may be changed during data packet processing. | |
911 | */ | |
12f69661 SH |
912 | if (!skb) |
913 | return netvsc_send_pkt(device, packet, net_device, pb, skb); | |
cf8190e4 | 914 | |
7c3877f2 | 915 | /* batch packets in send buffer if possible */ |
b8b835a8 | 916 | msdp = &nvchan->msd; |
7c3877f2 HZ |
917 | if (msdp->pkt) |
918 | msd_len = msdp->pkt->total_data_buflen; | |
919 | ||
ebc1dcf6 | 920 | try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; |
aa0a34be | 921 | if (try_batch && msd_len + pktlen + net_device->pkt_align < |
7c3877f2 HZ |
922 | net_device->send_section_size) { |
923 | section_index = msdp->pkt->send_buf_index; | |
924 | ||
aa0a34be HZ |
925 | } else if (try_batch && msd_len + packet->rmsg_size < |
926 | net_device->send_section_size) { | |
927 | section_index = msdp->pkt->send_buf_index; | |
928 | packet->cp_partial = true; | |
929 | ||
ebc1dcf6 | 930 | } else if (pktlen + net_device->pkt_align < |
7c3877f2 HZ |
931 | net_device->send_section_size) { |
932 | section_index = netvsc_get_next_send_section(net_device); | |
cad5c197 | 933 | if (unlikely(section_index == NETVSC_INVALID_INDEX)) { |
934 | ++ndev_ctx->eth_stats.tx_send_full; | |
935 | } else { | |
c85e4924 HZ |
936 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
937 | msd_len = 0; | |
7c3877f2 HZ |
938 | } |
939 | } | |
940 | ||
cfd8afd9 SH |
941 | /* Keep aggregating only if stack says more data is coming |
942 | * and not doing mixed modes send and not flow blocked | |
943 | */ | |
944 | xmit_more = skb->xmit_more && | |
945 | !packet->cp_partial && | |
946 | !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); | |
947 | ||
7c3877f2 HZ |
948 | if (section_index != NETVSC_INVALID_INDEX) { |
949 | netvsc_copy_to_send_buf(net_device, | |
950 | section_index, msd_len, | |
cfd8afd9 | 951 | packet, rndis_msg, pb, xmit_more); |
b08cc791 | 952 | |
7c3877f2 | 953 | packet->send_buf_index = section_index; |
aa0a34be HZ |
954 | |
955 | if (packet->cp_partial) { | |
956 | packet->page_buf_cnt -= packet->rmsg_pgcnt; | |
957 | packet->total_data_buflen = msd_len + packet->rmsg_size; | |
958 | } else { | |
959 | packet->page_buf_cnt = 0; | |
960 | packet->total_data_buflen += msd_len; | |
aa0a34be | 961 | } |
7c3877f2 | 962 | |
793e3955 | 963 | if (msdp->pkt) { |
964 | packet->total_packets += msdp->pkt->total_packets; | |
965 | packet->total_bytes += msdp->pkt->total_bytes; | |
966 | } | |
967 | ||
c85e4924 | 968 | if (msdp->skb) |
17db4bce | 969 | dev_consume_skb_any(msdp->skb); |
ee90b812 | 970 | |
cfd8afd9 | 971 | if (xmit_more) { |
c85e4924 | 972 | msdp->skb = skb; |
7c3877f2 HZ |
973 | msdp->pkt = packet; |
974 | msdp->count++; | |
975 | } else { | |
976 | cur_send = packet; | |
c85e4924 | 977 | msdp->skb = NULL; |
7c3877f2 HZ |
978 | msdp->pkt = NULL; |
979 | msdp->count = 0; | |
980 | } | |
981 | } else { | |
c85e4924 | 982 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
7c3877f2 HZ |
983 | cur_send = packet; |
984 | } | |
985 | ||
7c3877f2 | 986 | if (msd_send) { |
6c4c137e SH |
987 | int m_ret = netvsc_send_pkt(device, msd_send, net_device, |
988 | NULL, msd_skb); | |
7c3877f2 HZ |
989 | |
990 | if (m_ret != 0) { | |
991 | netvsc_free_send_slot(net_device, | |
992 | msd_send->send_buf_index); | |
c85e4924 | 993 | dev_kfree_skb_any(msd_skb); |
7c3877f2 HZ |
994 | } |
995 | } | |
996 | ||
997 | if (cur_send) | |
0a1275ca | 998 | ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); |
7c3877f2 | 999 | |
7aab5159 JS |
1000 | if (ret != 0 && section_index != NETVSC_INVALID_INDEX) |
1001 | netvsc_free_send_slot(net_device, section_index); | |
d953ca4d | 1002 | |
fceaf24a HJ |
1003 | return ret; |
1004 | } | |
1005 | ||
7426b1a5 | 1006 | /* Send pending recv completions */ |
cad5c197 | 1007 | static int send_recv_completions(struct net_device *ndev, |
1008 | struct netvsc_device *nvdev, | |
1009 | struct netvsc_channel *nvchan) | |
5fa9d3c5 | 1010 | { |
7426b1a5 | 1011 | struct multi_recv_comp *mrc = &nvchan->mrc; |
1012 | struct recv_comp_msg { | |
1013 | struct nvsp_message_header hdr; | |
1014 | u32 status; | |
1015 | } __packed; | |
1016 | struct recv_comp_msg msg = { | |
1017 | .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, | |
1018 | }; | |
5fa9d3c5 HZ |
1019 | int ret; |
1020 | ||
7426b1a5 | 1021 | while (mrc->first != mrc->next) { |
1022 | const struct recv_comp_data *rcd | |
1023 | = mrc->slots + mrc->first; | |
c0b558e5 | 1024 | |
7426b1a5 | 1025 | msg.status = rcd->status; |
1026 | ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), | |
1027 | rcd->tid, VM_PKT_COMP, 0); | |
cad5c197 | 1028 | if (unlikely(ret)) { |
1029 | struct net_device_context *ndev_ctx = netdev_priv(ndev); | |
1030 | ||
1031 | ++ndev_ctx->eth_stats.rx_comp_busy; | |
7426b1a5 | 1032 | return ret; |
cad5c197 | 1033 | } |
c0b558e5 | 1034 | |
7426b1a5 | 1035 | if (++mrc->first == nvdev->recv_completion_cnt) |
1036 | mrc->first = 0; | |
1037 | } | |
c0b558e5 | 1038 | |
7426b1a5 | 1039 | /* receive completion ring has been emptied */ |
1040 | if (unlikely(nvdev->destroy)) | |
1041 | wake_up(&nvdev->wait_drain); | |
c0b558e5 | 1042 | |
7426b1a5 | 1043 | return 0; |
c0b558e5 HZ |
1044 | } |
1045 | ||
7426b1a5 | 1046 | /* Count how many receive completions are outstanding */ |
1047 | static void recv_comp_slot_avail(const struct netvsc_device *nvdev, | |
1048 | const struct multi_recv_comp *mrc, | |
1049 | u32 *filled, u32 *avail) | |
c0b558e5 | 1050 | { |
7426b1a5 | 1051 | u32 count = nvdev->recv_completion_cnt; |
c0b558e5 | 1052 | |
7426b1a5 | 1053 | if (mrc->next >= mrc->first) |
1054 | *filled = mrc->next - mrc->first; | |
1055 | else | |
1056 | *filled = (count - mrc->first) + mrc->next; | |
c0b558e5 | 1057 | |
7426b1a5 | 1058 | *avail = count - *filled - 1; |
c0b558e5 HZ |
1059 | } |
1060 | ||
7426b1a5 | 1061 | /* Add receive complete to ring to send to host. */ |
1062 | static void enq_receive_complete(struct net_device *ndev, | |
1063 | struct netvsc_device *nvdev, u16 q_idx, | |
1064 | u64 tid, u32 status) | |
c0b558e5 | 1065 | { |
7426b1a5 | 1066 | struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; |
1067 | struct multi_recv_comp *mrc = &nvchan->mrc; | |
c0b558e5 | 1068 | struct recv_comp_data *rcd; |
7426b1a5 | 1069 | u32 filled, avail; |
c0b558e5 | 1070 | |
7426b1a5 | 1071 | recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
c0b558e5 | 1072 | |
7426b1a5 | 1073 | if (unlikely(filled > NAPI_POLL_WEIGHT)) { |
cad5c197 | 1074 | send_recv_completions(ndev, nvdev, nvchan); |
7426b1a5 | 1075 | recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
5fa9d3c5 | 1076 | } |
c0b558e5 | 1077 | |
7426b1a5 | 1078 | if (unlikely(!avail)) { |
1079 | netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", | |
1080 | q_idx, tid); | |
1081 | return; | |
1082 | } | |
c0b558e5 | 1083 | |
7426b1a5 | 1084 | rcd = mrc->slots + mrc->next; |
1085 | rcd->tid = tid; | |
1086 | rcd->status = status; | |
c0b558e5 | 1087 | |
7426b1a5 | 1088 | if (++mrc->next == nvdev->recv_completion_cnt) |
1089 | mrc->next = 0; | |
c0b558e5 HZ |
1090 | } |
1091 | ||
15a863bf | 1092 | static int netvsc_receive(struct net_device *ndev, |
7426b1a5 | 1093 | struct netvsc_device *net_device, |
1094 | struct net_device_context *net_device_ctx, | |
1095 | struct hv_device *device, | |
1096 | struct vmbus_channel *channel, | |
1097 | const struct vmpacket_descriptor *desc, | |
1098 | struct nvsp_message *nvsp) | |
fceaf24a | 1099 | { |
f3dd3f47 | 1100 | const struct vmtransfer_page_packet_header *vmxferpage_packet |
1101 | = container_of(desc, const struct vmtransfer_page_packet_header, d); | |
15a863bf | 1102 | u16 q_idx = channel->offermsg.offer.sub_channel_index; |
dc54a08c | 1103 | char *recv_buf = net_device->recv_buf; |
4baab261 | 1104 | u32 status = NVSP_STAT_SUCCESS; |
45326342 HZ |
1105 | int i; |
1106 | int count = 0; | |
779b4d17 | 1107 | |
454f18a9 | 1108 | /* Make sure this is a valid nvsp packet */ |
dc54a08c | 1109 | if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { |
1110 | netif_err(net_device_ctx, rx_err, ndev, | |
1111 | "Unknown nvsp packet type received %u\n", | |
1112 | nvsp->hdr.msg_type); | |
15a863bf | 1113 | return 0; |
fceaf24a HJ |
1114 | } |
1115 | ||
dc54a08c | 1116 | if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { |
1117 | netif_err(net_device_ctx, rx_err, ndev, | |
1118 | "Invalid xfer page set id - expecting %x got %x\n", | |
1119 | NETVSC_RECEIVE_BUFFER_ID, | |
1120 | vmxferpage_packet->xfer_pageset_id); | |
15a863bf | 1121 | return 0; |
fceaf24a HJ |
1122 | } |
1123 | ||
4baab261 | 1124 | count = vmxferpage_packet->range_cnt; |
fceaf24a | 1125 | |
454f18a9 | 1126 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
4baab261 | 1127 | for (i = 0; i < count; i++) { |
c5d24bdd | 1128 | u32 offset = vmxferpage_packet->ranges[i].byte_offset; |
dc54a08c | 1129 | u32 buflen = vmxferpage_packet->ranges[i].byte_count; |
c5d24bdd | 1130 | void *data; |
5c71dadb | 1131 | int ret; |
fceaf24a | 1132 | |
c5d24bdd HZ |
1133 | if (unlikely(offset + buflen > net_device->recv_buf_size)) { |
1134 | status = NVSP_STAT_FAIL; | |
1135 | netif_err(net_device_ctx, rx_err, ndev, | |
1136 | "Packet offset:%u + len:%u too big\n", | |
1137 | offset, buflen); | |
1138 | ||
1139 | continue; | |
1140 | } | |
1141 | ||
1142 | data = recv_buf + offset; | |
1143 | ||
ec966381 SH |
1144 | trace_rndis_recv(ndev, q_idx, data); |
1145 | ||
454f18a9 | 1146 | /* Pass it to the upper layer */ |
5c71dadb HZ |
1147 | ret = rndis_filter_receive(ndev, net_device, |
1148 | channel, data, buflen); | |
1149 | ||
1150 | if (unlikely(ret != NVSP_STAT_SUCCESS)) | |
1151 | status = NVSP_STAT_FAIL; | |
fceaf24a HJ |
1152 | } |
1153 | ||
7426b1a5 | 1154 | enq_receive_complete(ndev, net_device, q_idx, |
1155 | vmxferpage_packet->d.trans_id, status); | |
15a863bf | 1156 | |
15a863bf | 1157 | return count; |
fceaf24a HJ |
1158 | } |
1159 | ||
5b54dac8 | 1160 | static void netvsc_send_table(struct hv_device *hdev, |
71790a27 | 1161 | struct nvsp_message *nvmsg) |
5b54dac8 | 1162 | { |
0a1275ca | 1163 | struct net_device *ndev = hv_get_drvdata(hdev); |
7ce10124 | 1164 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
5b54dac8 HZ |
1165 | int i; |
1166 | u32 count, *tab; | |
1167 | ||
5b54dac8 HZ |
1168 | count = nvmsg->msg.v5_msg.send_table.count; |
1169 | if (count != VRSS_SEND_TAB_SIZE) { | |
1170 | netdev_err(ndev, "Received wrong send-table size:%u\n", count); | |
1171 | return; | |
1172 | } | |
1173 | ||
1174 | tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + | |
1175 | nvmsg->msg.v5_msg.send_table.offset); | |
1176 | ||
1177 | for (i = 0; i < count; i++) | |
39e91cfb | 1178 | net_device_ctx->tx_table[i] = tab[i]; |
5b54dac8 HZ |
1179 | } |
1180 | ||
f9a7da91 | 1181 | static void netvsc_send_vf(struct net_device_context *net_device_ctx, |
71790a27 HZ |
1182 | struct nvsp_message *nvmsg) |
1183 | { | |
f9a7da91 VK |
1184 | net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; |
1185 | net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; | |
71790a27 HZ |
1186 | } |
1187 | ||
1188 | static inline void netvsc_receive_inband(struct hv_device *hdev, | |
f9a7da91 VK |
1189 | struct net_device_context *net_device_ctx, |
1190 | struct nvsp_message *nvmsg) | |
71790a27 HZ |
1191 | { |
1192 | switch (nvmsg->hdr.msg_type) { | |
1193 | case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: | |
1194 | netvsc_send_table(hdev, nvmsg); | |
1195 | break; | |
1196 | ||
1197 | case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: | |
f9a7da91 | 1198 | netvsc_send_vf(net_device_ctx, nvmsg); |
71790a27 HZ |
1199 | break; |
1200 | } | |
1201 | } | |
1202 | ||
15a863bf | 1203 | static int netvsc_process_raw_pkt(struct hv_device *device, |
1204 | struct vmbus_channel *channel, | |
1205 | struct netvsc_device *net_device, | |
1206 | struct net_device *ndev, | |
f9645430 | 1207 | const struct vmpacket_descriptor *desc, |
1208 | int budget) | |
99a50bb1 | 1209 | { |
f9a7da91 | 1210 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
f3dd3f47 | 1211 | struct nvsp_message *nvmsg = hv_pkt_data(desc); |
99a50bb1 | 1212 | |
ec966381 SH |
1213 | trace_nvsp_recv(ndev, channel, nvmsg); |
1214 | ||
99a50bb1 S |
1215 | switch (desc->type) { |
1216 | case VM_PKT_COMP: | |
f9645430 | 1217 | netvsc_send_completion(net_device, channel, device, |
1218 | desc, budget); | |
99a50bb1 S |
1219 | break; |
1220 | ||
1221 | case VM_PKT_DATA_USING_XFER_PAGES: | |
15a863bf | 1222 | return netvsc_receive(ndev, net_device, net_device_ctx, |
1223 | device, channel, desc, nvmsg); | |
99a50bb1 S |
1224 | break; |
1225 | ||
1226 | case VM_PKT_DATA_INBAND: | |
f9a7da91 | 1227 | netvsc_receive_inband(device, net_device_ctx, nvmsg); |
99a50bb1 S |
1228 | break; |
1229 | ||
1230 | default: | |
1231 | netdev_err(ndev, "unhandled packet type %d, tid %llx\n", | |
f4f1c23d | 1232 | desc->type, desc->trans_id); |
99a50bb1 S |
1233 | break; |
1234 | } | |
15a863bf | 1235 | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) | |
1240 | { | |
1241 | struct vmbus_channel *primary = channel->primary_channel; | |
1242 | ||
1243 | return primary ? primary->device_obj : channel->device_obj; | |
1244 | } | |
1245 | ||
262b7f14 | 1246 | /* Network processing softirq |
1247 | * Process data in incoming ring buffer from host | |
1248 | * Stops when ring is empty or budget is met or exceeded. | |
1249 | */ | |
15a863bf | 1250 | int netvsc_poll(struct napi_struct *napi, int budget) |
1251 | { | |
1252 | struct netvsc_channel *nvchan | |
1253 | = container_of(napi, struct netvsc_channel, napi); | |
35fbbccf | 1254 | struct netvsc_device *net_device = nvchan->net_device; |
15a863bf | 1255 | struct vmbus_channel *channel = nvchan->channel; |
1256 | struct hv_device *device = netvsc_channel_to_device(channel); | |
15a863bf | 1257 | struct net_device *ndev = hv_get_drvdata(device); |
15a863bf | 1258 | int work_done = 0; |
1259 | ||
f4f1c23d | 1260 | /* If starting a new interval */ |
1261 | if (!nvchan->desc) | |
1262 | nvchan->desc = hv_pkt_iter_first(channel); | |
15a863bf | 1263 | |
f4f1c23d | 1264 | while (nvchan->desc && work_done < budget) { |
1265 | work_done += netvsc_process_raw_pkt(device, channel, net_device, | |
f9645430 | 1266 | ndev, nvchan->desc, budget); |
f4f1c23d | 1267 | nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); |
15a863bf | 1268 | } |
15a863bf | 1269 | |
f4e40363 | 1270 | /* If send of pending receive completions suceeded |
1271 | * and did not exhaust NAPI budget this time | |
7426b1a5 | 1272 | * and not doing busy poll |
f4e40363 | 1273 | * then re-enable host interrupts |
1274 | * and reschedule if ring is not empty. | |
262b7f14 | 1275 | */ |
cad5c197 | 1276 | if (send_recv_completions(ndev, net_device, nvchan) == 0 && |
7426b1a5 | 1277 | work_done < budget && |
15a863bf | 1278 | napi_complete_done(napi, work_done) && |
d64e38ae SH |
1279 | hv_end_read(&channel->inbound) && |
1280 | napi_schedule_prep(napi)) { | |
7426b1a5 | 1281 | hv_begin_read(&channel->inbound); |
d64e38ae | 1282 | __napi_schedule(napi); |
7426b1a5 | 1283 | } |
f4f1c23d | 1284 | |
1285 | /* Driver may overshoot since multiple packets per descriptor */ | |
1286 | return min(work_done, budget); | |
99a50bb1 S |
1287 | } |
1288 | ||
262b7f14 | 1289 | /* Call back when data is available in host ring buffer. |
1290 | * Processing is deferred until network softirq (NAPI) | |
1291 | */ | |
5b54dac8 | 1292 | void netvsc_channel_cb(void *context) |
fceaf24a | 1293 | { |
6de38af6 | 1294 | struct netvsc_channel *nvchan = context; |
43bf99ce | 1295 | struct vmbus_channel *channel = nvchan->channel; |
1296 | struct hv_ring_buffer_info *rbi = &channel->inbound; | |
1297 | ||
1298 | /* preload first vmpacket descriptor */ | |
1299 | prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); | |
0b307ebd | 1300 | |
f4f1c23d | 1301 | if (napi_schedule_prep(&nvchan->napi)) { |
1302 | /* disable interupts from host */ | |
43bf99ce | 1303 | hv_begin_read(rbi); |
0d6dd357 | 1304 | |
68633eda | 1305 | __napi_schedule_irqoff(&nvchan->napi); |
f4f1c23d | 1306 | } |
fceaf24a | 1307 | } |
af24ce42 | 1308 | |
b637e023 HZ |
1309 | /* |
1310 | * netvsc_device_add - Callback when the device belonging to this | |
1311 | * driver is added | |
1312 | */ | |
9749fed5 | 1313 | struct netvsc_device *netvsc_device_add(struct hv_device *device, |
1314 | const struct netvsc_device_info *device_info) | |
b637e023 | 1315 | { |
88098834 | 1316 | int i, ret = 0; |
b637e023 | 1317 | struct netvsc_device *net_device; |
88098834 VK |
1318 | struct net_device *ndev = hv_get_drvdata(device); |
1319 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
b637e023 | 1320 | |
88098834 | 1321 | net_device = alloc_net_device(); |
b1c84927 | 1322 | if (!net_device) |
9749fed5 | 1323 | return ERR_PTR(-ENOMEM); |
b637e023 | 1324 | |
6b0cbe31 HZ |
1325 | for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) |
1326 | net_device_ctx->tx_table[i] = 0; | |
1327 | ||
15a863bf | 1328 | /* Because the device uses NAPI, all the interrupt batching and |
1329 | * control is done via Net softirq, not the channel handling | |
1330 | */ | |
1331 | set_channel_read_mode(device->channel, HV_CALL_ISR); | |
1332 | ||
bffb1842 S |
1333 | /* If we're reopening the device we may have multiple queues, fill the |
1334 | * chn_table with the default channel to use it before subchannels are | |
1335 | * opened. | |
1336 | * Initialize the channel state before we open; | |
1337 | * we can be interrupted as soon as we open the channel. | |
1338 | */ | |
1339 | ||
1340 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) { | |
1341 | struct netvsc_channel *nvchan = &net_device->chan_table[i]; | |
1342 | ||
1343 | nvchan->channel = device->channel; | |
35fbbccf | 1344 | nvchan->net_device = net_device; |
4a0dee1f FF |
1345 | u64_stats_init(&nvchan->tx_stats.syncp); |
1346 | u64_stats_init(&nvchan->rx_stats.syncp); | |
bffb1842 S |
1347 | } |
1348 | ||
2be0f264 | 1349 | /* Enable NAPI handler before init callbacks */ |
1350 | netif_napi_add(ndev, &net_device->chan_table[0].napi, | |
1351 | netvsc_poll, NAPI_POLL_WEIGHT); | |
1352 | ||
b637e023 | 1353 | /* Open the channel */ |
a7f99d0f SH |
1354 | ret = vmbus_open(device->channel, netvsc_ring_bytes, |
1355 | netvsc_ring_bytes, NULL, 0, | |
1356 | netvsc_channel_cb, net_device->chan_table); | |
b637e023 HZ |
1357 | |
1358 | if (ret != 0) { | |
d9871158 | 1359 | netdev_err(ndev, "unable to open channel: %d\n", ret); |
b637e023 HZ |
1360 | goto cleanup; |
1361 | } | |
1362 | ||
1363 | /* Channel is opened */ | |
93ba2222 | 1364 | netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); |
b637e023 | 1365 | |
15a863bf | 1366 | napi_enable(&net_device->chan_table[0].napi); |
88098834 | 1367 | |
b637e023 | 1368 | /* Connect with the NetVsp */ |
8b532797 | 1369 | ret = netvsc_connect_vsp(device, net_device, device_info); |
b637e023 | 1370 | if (ret != 0) { |
d9871158 | 1371 | netdev_err(ndev, |
c909ebbd | 1372 | "unable to connect to NetVSP - %d\n", ret); |
b637e023 HZ |
1373 | goto close; |
1374 | } | |
1375 | ||
12f69661 SH |
1376 | /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is |
1377 | * populated. | |
1378 | */ | |
1379 | rcu_assign_pointer(net_device_ctx->nvdev, net_device); | |
1380 | ||
9749fed5 | 1381 | return net_device; |
b637e023 HZ |
1382 | |
1383 | close: | |
49393347 | 1384 | RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
1385 | napi_disable(&net_device->chan_table[0].napi); | |
15a863bf | 1386 | |
b637e023 HZ |
1387 | /* Now, we can close the channel safely */ |
1388 | vmbus_close(device->channel); | |
1389 | ||
1390 | cleanup: | |
fcfb4a00 | 1391 | netif_napi_del(&net_device->chan_table[0].napi); |
545a8e79 | 1392 | free_netvsc_device(&net_device->rcu); |
b637e023 | 1393 | |
9749fed5 | 1394 | return ERR_PTR(ret); |
b637e023 | 1395 | } |