]>
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> |
9749fed5 | 34 | |
c25aaf81 | 35 | #include <asm/sync_bitops.h> |
3f335ea2 | 36 | |
5ca7252a | 37 | #include "hyperv_net.h" |
fceaf24a | 38 | |
84bf9cef KS |
39 | /* |
40 | * Switch the data path from the synthetic interface to the VF | |
41 | * interface. | |
42 | */ | |
0a1275ca | 43 | void netvsc_switch_datapath(struct net_device *ndev, bool vf) |
84bf9cef | 44 | { |
3d541ac5 VK |
45 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
46 | struct hv_device *dev = net_device_ctx->device_ctx; | |
79e8cbe7 | 47 | struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev); |
0a1275ca | 48 | struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt; |
84bf9cef KS |
49 | |
50 | memset(init_pkt, 0, sizeof(struct nvsp_message)); | |
51 | init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH; | |
52 | if (vf) | |
53 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
54 | NVSP_DATAPATH_VF; | |
55 | else | |
56 | init_pkt->msg.v4_msg.active_dp.active_datapath = | |
57 | NVSP_DATAPATH_SYNTHETIC; | |
58 | ||
59 | vmbus_sendpacket(dev->channel, init_pkt, | |
60 | sizeof(struct nvsp_message), | |
61 | (unsigned long)init_pkt, | |
62 | VM_PKT_DATA_INBAND, 0); | |
63 | } | |
64 | ||
2950481a SH |
65 | /* Worker to setup sub channels on initial setup |
66 | * Initial hotplug event occurs in softirq context | |
67 | * and can't wait for channels. | |
68 | */ | |
69 | static void netvsc_subchan_work(struct work_struct *w) | |
70 | { | |
71 | struct netvsc_device *nvdev = | |
72 | container_of(w, struct netvsc_device, subchan_work); | |
73 | struct rndis_device *rdev; | |
74 | int i, ret; | |
75 | ||
76 | /* Avoid deadlock with device removal already under RTNL */ | |
77 | if (!rtnl_trylock()) { | |
78 | schedule_work(w); | |
79 | return; | |
80 | } | |
81 | ||
82 | rdev = nvdev->extension; | |
83 | if (rdev) { | |
84 | ret = rndis_set_subchannel(rdev->ndev, nvdev); | |
85 | if (ret == 0) { | |
86 | netif_device_attach(rdev->ndev); | |
87 | } else { | |
88 | /* fallback to only primary channel */ | |
89 | for (i = 1; i < nvdev->num_chn; i++) | |
90 | netif_napi_del(&nvdev->chan_table[i].napi); | |
91 | ||
92 | nvdev->max_chn = 1; | |
93 | nvdev->num_chn = 1; | |
94 | } | |
95 | } | |
96 | ||
97 | rtnl_unlock(); | |
98 | } | |
99 | ||
88098834 | 100 | static struct netvsc_device *alloc_net_device(void) |
fceaf24a | 101 | { |
85799a37 | 102 | struct netvsc_device *net_device; |
fceaf24a | 103 | |
85799a37 HZ |
104 | net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL); |
105 | if (!net_device) | |
fceaf24a HJ |
106 | return NULL; |
107 | ||
dc5cd894 | 108 | init_waitqueue_head(&net_device->wait_drain); |
c38b9c71 | 109 | net_device->destroy = false; |
a1979526 | 110 | net_device->tx_disable = false; |
84bf9cef | 111 | atomic_set(&net_device->open_cnt, 0); |
7c3877f2 HZ |
112 | net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT; |
113 | net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT; | |
8b532797 | 114 | |
fd612602 | 115 | init_completion(&net_device->channel_init_wait); |
732e4985 | 116 | init_waitqueue_head(&net_device->subchan_open); |
2950481a | 117 | INIT_WORK(&net_device->subchan_work, netvsc_subchan_work); |
7c3877f2 | 118 | |
85799a37 | 119 | return net_device; |
fceaf24a HJ |
120 | } |
121 | ||
545a8e79 | 122 | static void free_netvsc_device(struct rcu_head *head) |
f90251c8 | 123 | { |
545a8e79 | 124 | struct netvsc_device *nvdev |
125 | = container_of(head, struct netvsc_device, rcu); | |
c0b558e5 HZ |
126 | int i; |
127 | ||
592de81e SH |
128 | kfree(nvdev->extension); |
129 | vfree(nvdev->recv_buf); | |
130 | vfree(nvdev->send_buf); | |
131 | kfree(nvdev->send_section_map); | |
132 | ||
c0b558e5 | 133 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) |
7426b1a5 | 134 | vfree(nvdev->chan_table[i].mrc.slots); |
c0b558e5 | 135 | |
f90251c8 HZ |
136 | kfree(nvdev); |
137 | } | |
138 | ||
545a8e79 | 139 | static void free_netvsc_device_rcu(struct netvsc_device *nvdev) |
140 | { | |
141 | call_rcu(&nvdev->rcu, free_netvsc_device); | |
142 | } | |
fceaf24a | 143 | |
caf13133 MG |
144 | static void netvsc_revoke_recv_buf(struct hv_device *device, |
145 | struct netvsc_device *net_device) | |
ec91cd09 | 146 | { |
3d541ac5 | 147 | struct net_device *ndev = hv_get_drvdata(device); |
caf13133 | 148 | struct nvsp_message *revoke_packet; |
7a2a0a84 | 149 | int ret; |
ec91cd09 HZ |
150 | |
151 | /* | |
152 | * If we got a section count, it means we received a | |
153 | * SendReceiveBufferComplete msg (ie sent | |
154 | * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need | |
155 | * to send a revoke msg here | |
156 | */ | |
157 | if (net_device->recv_section_cnt) { | |
158 | /* Send the revoke receive buffer */ | |
159 | revoke_packet = &net_device->revoke_packet; | |
160 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
161 | ||
162 | revoke_packet->hdr.msg_type = | |
163 | NVSP_MSG1_TYPE_REVOKE_RECV_BUF; | |
164 | revoke_packet->msg.v1_msg. | |
165 | revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
166 | ||
3d541ac5 | 167 | ret = vmbus_sendpacket(device->channel, |
ec91cd09 HZ |
168 | revoke_packet, |
169 | sizeof(struct nvsp_message), | |
170 | (unsigned long)revoke_packet, | |
171 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
172 | /* If the failure is because the channel is rescinded; |
173 | * ignore the failure since we cannot send on a rescinded | |
174 | * channel. This would allow us to properly cleanup | |
175 | * even when the channel is rescinded. | |
176 | */ | |
177 | if (device->channel->rescind) | |
178 | ret = 0; | |
ec91cd09 HZ |
179 | /* |
180 | * If we failed here, we might as well return and | |
181 | * have a leak rather than continue and a bugchk | |
182 | */ | |
183 | if (ret != 0) { | |
d9871158 | 184 | netdev_err(ndev, "unable to send " |
c909ebbd | 185 | "revoke receive buffer to netvsp\n"); |
7a2a0a84 | 186 | return; |
ec91cd09 | 187 | } |
8b532797 | 188 | net_device->recv_section_cnt = 0; |
ec91cd09 | 189 | } |
caf13133 MG |
190 | } |
191 | ||
192 | static void netvsc_revoke_send_buf(struct hv_device *device, | |
193 | struct netvsc_device *net_device) | |
194 | { | |
195 | struct net_device *ndev = hv_get_drvdata(device); | |
196 | struct nvsp_message *revoke_packet; | |
197 | int ret; | |
ec91cd09 | 198 | |
c25aaf81 KS |
199 | /* Deal with the send buffer we may have setup. |
200 | * If we got a send section size, it means we received a | |
c51ed182 HZ |
201 | * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent |
202 | * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need | |
c25aaf81 KS |
203 | * to send a revoke msg here |
204 | */ | |
8b532797 | 205 | if (net_device->send_section_cnt) { |
c25aaf81 KS |
206 | /* Send the revoke receive buffer */ |
207 | revoke_packet = &net_device->revoke_packet; | |
208 | memset(revoke_packet, 0, sizeof(struct nvsp_message)); | |
209 | ||
210 | revoke_packet->hdr.msg_type = | |
211 | NVSP_MSG1_TYPE_REVOKE_SEND_BUF; | |
c51ed182 HZ |
212 | revoke_packet->msg.v1_msg.revoke_send_buf.id = |
213 | NETVSC_SEND_BUFFER_ID; | |
c25aaf81 | 214 | |
3d541ac5 | 215 | ret = vmbus_sendpacket(device->channel, |
c25aaf81 KS |
216 | revoke_packet, |
217 | sizeof(struct nvsp_message), | |
218 | (unsigned long)revoke_packet, | |
219 | VM_PKT_DATA_INBAND, 0); | |
73e64fa4 S |
220 | |
221 | /* If the failure is because the channel is rescinded; | |
222 | * ignore the failure since we cannot send on a rescinded | |
223 | * channel. This would allow us to properly cleanup | |
224 | * even when the channel is rescinded. | |
225 | */ | |
226 | if (device->channel->rescind) | |
227 | ret = 0; | |
228 | ||
c25aaf81 KS |
229 | /* If we failed here, we might as well return and |
230 | * have a leak rather than continue and a bugchk | |
231 | */ | |
232 | if (ret != 0) { | |
233 | netdev_err(ndev, "unable to send " | |
234 | "revoke send buffer to netvsp\n"); | |
7a2a0a84 | 235 | return; |
c25aaf81 | 236 | } |
8b532797 | 237 | net_device->send_section_cnt = 0; |
c25aaf81 | 238 | } |
0cf73780 VK |
239 | } |
240 | ||
caf13133 MG |
241 | static void netvsc_teardown_recv_gpadl(struct hv_device *device, |
242 | struct netvsc_device *net_device) | |
0cf73780 VK |
243 | { |
244 | struct net_device *ndev = hv_get_drvdata(device); | |
245 | int ret; | |
246 | ||
247 | if (net_device->recv_buf_gpadl_handle) { | |
248 | ret = vmbus_teardown_gpadl(device->channel, | |
249 | net_device->recv_buf_gpadl_handle); | |
250 | ||
251 | /* If we failed here, we might as well return and have a leak | |
252 | * rather than continue and a bugchk | |
253 | */ | |
254 | if (ret != 0) { | |
255 | netdev_err(ndev, | |
256 | "unable to teardown receive buffer's gpadl\n"); | |
257 | return; | |
258 | } | |
259 | net_device->recv_buf_gpadl_handle = 0; | |
260 | } | |
caf13133 MG |
261 | } |
262 | ||
263 | static void netvsc_teardown_send_gpadl(struct hv_device *device, | |
264 | struct netvsc_device *net_device) | |
265 | { | |
266 | struct net_device *ndev = hv_get_drvdata(device); | |
267 | int ret; | |
0cf73780 | 268 | |
c25aaf81 | 269 | if (net_device->send_buf_gpadl_handle) { |
3d541ac5 | 270 | ret = vmbus_teardown_gpadl(device->channel, |
c25aaf81 KS |
271 | net_device->send_buf_gpadl_handle); |
272 | ||
273 | /* If we failed here, we might as well return and have a leak | |
274 | * rather than continue and a bugchk | |
275 | */ | |
276 | if (ret != 0) { | |
277 | netdev_err(ndev, | |
278 | "unable to teardown send buffer's gpadl\n"); | |
7a2a0a84 | 279 | return; |
c25aaf81 | 280 | } |
2f18423d | 281 | net_device->send_buf_gpadl_handle = 0; |
c25aaf81 | 282 | } |
ec91cd09 HZ |
283 | } |
284 | ||
7426b1a5 | 285 | int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx) |
286 | { | |
287 | struct netvsc_channel *nvchan = &net_device->chan_table[q_idx]; | |
288 | int node = cpu_to_node(nvchan->channel->target_cpu); | |
289 | size_t size; | |
290 | ||
291 | size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data); | |
292 | nvchan->mrc.slots = vzalloc_node(size, node); | |
293 | if (!nvchan->mrc.slots) | |
294 | nvchan->mrc.slots = vzalloc(size); | |
295 | ||
296 | return nvchan->mrc.slots ? 0 : -ENOMEM; | |
297 | } | |
298 | ||
95790837 | 299 | static int netvsc_init_buf(struct hv_device *device, |
8b532797 | 300 | struct netvsc_device *net_device, |
301 | const struct netvsc_device_info *device_info) | |
fceaf24a | 302 | { |
7426b1a5 | 303 | struct nvsp_1_message_send_receive_buffer_complete *resp; |
95833370 | 304 | struct net_device *ndev = hv_get_drvdata(device); |
305 | struct nvsp_message *init_packet; | |
8b532797 | 306 | unsigned int buf_size; |
fdfb70d2 | 307 | size_t map_words; |
95833370 | 308 | int ret = 0; |
0a726c2b | 309 | |
8b532797 | 310 | /* Get receive buffer area. */ |
0ab09bef | 311 | buf_size = device_info->recv_sections * device_info->recv_section_size; |
8b532797 | 312 | buf_size = roundup(buf_size, PAGE_SIZE); |
313 | ||
e776be25 HZ |
314 | /* Legacy hosts only allow smaller receive buffer */ |
315 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2) | |
316 | buf_size = min_t(unsigned int, buf_size, | |
317 | NETVSC_RECEIVE_BUFFER_SIZE_LEGACY); | |
318 | ||
8b532797 | 319 | net_device->recv_buf = vzalloc(buf_size); |
53d21fdb | 320 | if (!net_device->recv_buf) { |
8b532797 | 321 | netdev_err(ndev, |
322 | "unable to allocate receive buffer of size %u\n", | |
323 | buf_size); | |
927bc33c | 324 | ret = -ENOMEM; |
0c3b7b2f | 325 | goto cleanup; |
fceaf24a | 326 | } |
fceaf24a | 327 | |
454f18a9 BP |
328 | /* |
329 | * Establish the gpadl handle for this buffer on this | |
330 | * channel. Note: This call uses the vmbus connection rather | |
331 | * than the channel to establish the gpadl handle. | |
332 | */ | |
53d21fdb | 333 | ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf, |
8b532797 | 334 | buf_size, |
53d21fdb | 335 | &net_device->recv_buf_gpadl_handle); |
21a80820 | 336 | if (ret != 0) { |
d9871158 | 337 | netdev_err(ndev, |
c909ebbd | 338 | "unable to establish receive buffer's gpadl\n"); |
0c3b7b2f | 339 | goto cleanup; |
fceaf24a HJ |
340 | } |
341 | ||
454f18a9 | 342 | /* Notify the NetVsp of the gpadl handle */ |
53d21fdb | 343 | init_packet = &net_device->channel_init_pkt; |
85799a37 | 344 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb HZ |
345 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF; |
346 | init_packet->msg.v1_msg.send_recv_buf. | |
347 | gpadl_handle = net_device->recv_buf_gpadl_handle; | |
348 | init_packet->msg.v1_msg. | |
349 | send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID; | |
fceaf24a | 350 | |
454f18a9 | 351 | /* Send the gpadl notification request */ |
85799a37 | 352 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 353 | sizeof(struct nvsp_message), |
85799a37 | 354 | (unsigned long)init_packet, |
415f2287 | 355 | VM_PKT_DATA_INBAND, |
5a4df290 | 356 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 357 | if (ret != 0) { |
d9871158 | 358 | netdev_err(ndev, |
c909ebbd | 359 | "unable to send receive buffer's gpadl to netvsp\n"); |
0c3b7b2f | 360 | goto cleanup; |
fceaf24a HJ |
361 | } |
362 | ||
5362855a | 363 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 364 | |
454f18a9 | 365 | /* Check the response */ |
7426b1a5 | 366 | resp = &init_packet->msg.v1_msg.send_recv_buf_complete; |
367 | if (resp->status != NVSP_STAT_SUCCESS) { | |
368 | netdev_err(ndev, | |
369 | "Unable to complete receive buffer initialization with NetVsp - status %d\n", | |
370 | resp->status); | |
927bc33c | 371 | ret = -EINVAL; |
0c3b7b2f | 372 | goto cleanup; |
fceaf24a HJ |
373 | } |
374 | ||
454f18a9 | 375 | /* Parse the response */ |
7426b1a5 | 376 | netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n", |
377 | resp->num_sections, resp->sections[0].sub_alloc_size, | |
378 | resp->sections[0].num_sub_allocs); | |
fceaf24a | 379 | |
8b532797 | 380 | /* There should only be one section for the entire receive buffer */ |
381 | if (resp->num_sections != 1 || resp->sections[0].offset != 0) { | |
927bc33c | 382 | ret = -EINVAL; |
0c3b7b2f | 383 | goto cleanup; |
fceaf24a HJ |
384 | } |
385 | ||
8b532797 | 386 | net_device->recv_section_size = resp->sections[0].sub_alloc_size; |
387 | net_device->recv_section_cnt = resp->sections[0].num_sub_allocs; | |
388 | ||
7426b1a5 | 389 | /* Setup receive completion ring */ |
390 | net_device->recv_completion_cnt | |
8b532797 | 391 | = round_up(net_device->recv_section_cnt + 1, |
7426b1a5 | 392 | PAGE_SIZE / sizeof(u64)); |
393 | ret = netvsc_alloc_recv_comp_ring(net_device, 0); | |
394 | if (ret) | |
395 | goto cleanup; | |
396 | ||
397 | /* Now setup the send buffer. */ | |
0ab09bef | 398 | buf_size = device_info->send_sections * device_info->send_section_size; |
8b532797 | 399 | buf_size = round_up(buf_size, PAGE_SIZE); |
400 | ||
401 | net_device->send_buf = vzalloc(buf_size); | |
c25aaf81 | 402 | if (!net_device->send_buf) { |
8b532797 | 403 | netdev_err(ndev, "unable to allocate send buffer of size %u\n", |
404 | buf_size); | |
c25aaf81 KS |
405 | ret = -ENOMEM; |
406 | goto cleanup; | |
407 | } | |
408 | ||
409 | /* Establish the gpadl handle for this buffer on this | |
410 | * channel. Note: This call uses the vmbus connection rather | |
411 | * than the channel to establish the gpadl handle. | |
412 | */ | |
413 | ret = vmbus_establish_gpadl(device->channel, net_device->send_buf, | |
8b532797 | 414 | buf_size, |
c25aaf81 KS |
415 | &net_device->send_buf_gpadl_handle); |
416 | if (ret != 0) { | |
417 | netdev_err(ndev, | |
418 | "unable to establish send buffer's gpadl\n"); | |
419 | goto cleanup; | |
420 | } | |
421 | ||
422 | /* Notify the NetVsp of the gpadl handle */ | |
423 | init_packet = &net_device->channel_init_pkt; | |
424 | memset(init_packet, 0, sizeof(struct nvsp_message)); | |
425 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF; | |
c51ed182 | 426 | init_packet->msg.v1_msg.send_send_buf.gpadl_handle = |
c25aaf81 | 427 | net_device->send_buf_gpadl_handle; |
c51ed182 | 428 | init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID; |
c25aaf81 KS |
429 | |
430 | /* Send the gpadl notification request */ | |
431 | ret = vmbus_sendpacket(device->channel, init_packet, | |
432 | sizeof(struct nvsp_message), | |
433 | (unsigned long)init_packet, | |
434 | VM_PKT_DATA_INBAND, | |
435 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
436 | if (ret != 0) { | |
437 | netdev_err(ndev, | |
438 | "unable to send send buffer's gpadl to netvsp\n"); | |
439 | goto cleanup; | |
440 | } | |
441 | ||
5362855a | 442 | wait_for_completion(&net_device->channel_init_wait); |
c25aaf81 KS |
443 | |
444 | /* Check the response */ | |
445 | if (init_packet->msg.v1_msg. | |
446 | send_send_buf_complete.status != NVSP_STAT_SUCCESS) { | |
447 | netdev_err(ndev, "Unable to complete send buffer " | |
448 | "initialization with NetVsp - status %d\n", | |
449 | init_packet->msg.v1_msg. | |
c51ed182 | 450 | send_send_buf_complete.status); |
c25aaf81 KS |
451 | ret = -EINVAL; |
452 | goto cleanup; | |
453 | } | |
454 | ||
455 | /* Parse the response */ | |
456 | net_device->send_section_size = init_packet->msg. | |
457 | v1_msg.send_send_buf_complete.section_size; | |
458 | ||
8b532797 | 459 | /* Section count is simply the size divided by the section size. */ |
460 | net_device->send_section_cnt = buf_size / net_device->send_section_size; | |
c25aaf81 | 461 | |
93ba2222 VK |
462 | netdev_dbg(ndev, "Send section size: %d, Section count:%d\n", |
463 | net_device->send_section_size, net_device->send_section_cnt); | |
c25aaf81 KS |
464 | |
465 | /* Setup state for managing the send buffer. */ | |
fdfb70d2 | 466 | map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG); |
c25aaf81 | 467 | |
fdfb70d2 | 468 | net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL); |
dd1d3f8f WY |
469 | if (net_device->send_section_map == NULL) { |
470 | ret = -ENOMEM; | |
c25aaf81 | 471 | goto cleanup; |
dd1d3f8f | 472 | } |
c25aaf81 | 473 | |
0c3b7b2f | 474 | goto exit; |
fceaf24a | 475 | |
0c3b7b2f | 476 | cleanup: |
caf13133 MG |
477 | netvsc_revoke_recv_buf(device, net_device); |
478 | netvsc_revoke_send_buf(device, net_device); | |
479 | netvsc_teardown_recv_gpadl(device, net_device); | |
480 | netvsc_teardown_send_gpadl(device, net_device); | |
fceaf24a | 481 | |
0c3b7b2f | 482 | exit: |
fceaf24a HJ |
483 | return ret; |
484 | } | |
485 | ||
f157e78d HZ |
486 | /* Negotiate NVSP protocol version */ |
487 | static int negotiate_nvsp_ver(struct hv_device *device, | |
488 | struct netvsc_device *net_device, | |
489 | struct nvsp_message *init_packet, | |
490 | u32 nvsp_ver) | |
fceaf24a | 491 | { |
0a1275ca | 492 | struct net_device *ndev = hv_get_drvdata(device); |
7390fe9c | 493 | int ret; |
fceaf24a | 494 | |
85799a37 | 495 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
53d21fdb | 496 | init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT; |
f157e78d HZ |
497 | init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver; |
498 | init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver; | |
fceaf24a | 499 | |
454f18a9 | 500 | /* Send the init request */ |
85799a37 | 501 | ret = vmbus_sendpacket(device->channel, init_packet, |
5a4df290 | 502 | sizeof(struct nvsp_message), |
85799a37 | 503 | (unsigned long)init_packet, |
415f2287 | 504 | VM_PKT_DATA_INBAND, |
5a4df290 | 505 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); |
21a80820 | 506 | |
b8a3d52b | 507 | if (ret != 0) |
f157e78d | 508 | return ret; |
fceaf24a | 509 | |
5362855a | 510 | wait_for_completion(&net_device->channel_init_wait); |
fceaf24a | 511 | |
53d21fdb | 512 | if (init_packet->msg.init_msg.init_complete.status != |
f157e78d HZ |
513 | NVSP_STAT_SUCCESS) |
514 | return -EINVAL; | |
fceaf24a | 515 | |
a1eabb01 | 516 | if (nvsp_ver == NVSP_PROTOCOL_VERSION_1) |
f157e78d HZ |
517 | return 0; |
518 | ||
71790a27 | 519 | /* NVSPv2 or later: Send NDIS config */ |
f157e78d HZ |
520 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
521 | init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG; | |
0a1275ca | 522 | init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN; |
1f5f3a75 | 523 | init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1; |
f157e78d | 524 | |
7f5d5af0 | 525 | if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) { |
71790a27 HZ |
526 | init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1; |
527 | ||
7f5d5af0 HZ |
528 | /* Teaming bit is needed to receive link speed updates */ |
529 | init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1; | |
530 | } | |
531 | ||
f157e78d HZ |
532 | ret = vmbus_sendpacket(device->channel, init_packet, |
533 | sizeof(struct nvsp_message), | |
534 | (unsigned long)init_packet, | |
535 | VM_PKT_DATA_INBAND, 0); | |
536 | ||
537 | return ret; | |
538 | } | |
539 | ||
95790837 | 540 | static int netvsc_connect_vsp(struct hv_device *device, |
8b532797 | 541 | struct netvsc_device *net_device, |
542 | const struct netvsc_device_info *device_info) | |
f157e78d | 543 | { |
1b17ca04 | 544 | static const u32 ver_list[] = { |
e5a78fad | 545 | NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2, |
95790837 | 546 | NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5 |
547 | }; | |
548 | struct nvsp_message *init_packet; | |
549 | int ndis_version, i, ret; | |
f157e78d HZ |
550 | |
551 | init_packet = &net_device->channel_init_pkt; | |
552 | ||
553 | /* Negotiate the latest NVSP protocol supported */ | |
e5a78fad | 554 | for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--) |
a1eabb01 HZ |
555 | if (negotiate_nvsp_ver(device, net_device, init_packet, |
556 | ver_list[i]) == 0) { | |
557 | net_device->nvsp_version = ver_list[i]; | |
558 | break; | |
559 | } | |
560 | ||
561 | if (i < 0) { | |
0f48c72c | 562 | ret = -EPROTO; |
0c3b7b2f | 563 | goto cleanup; |
fceaf24a | 564 | } |
f157e78d HZ |
565 | |
566 | pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version); | |
567 | ||
454f18a9 | 568 | /* Send the ndis version */ |
85799a37 | 569 | memset(init_packet, 0, sizeof(struct nvsp_message)); |
fceaf24a | 570 | |
a1eabb01 | 571 | if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4) |
1f73db49 | 572 | ndis_version = 0x00060001; |
a1eabb01 HZ |
573 | else |
574 | ndis_version = 0x0006001e; | |
fceaf24a | 575 | |
53d21fdb HZ |
576 | init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER; |
577 | init_packet->msg.v1_msg. | |
578 | send_ndis_ver.ndis_major_ver = | |
85799a37 | 579 | (ndis_version & 0xFFFF0000) >> 16; |
53d21fdb HZ |
580 | init_packet->msg.v1_msg. |
581 | send_ndis_ver.ndis_minor_ver = | |
85799a37 | 582 | ndis_version & 0xFFFF; |
fceaf24a | 583 | |
454f18a9 | 584 | /* Send the init request */ |
85799a37 | 585 | ret = vmbus_sendpacket(device->channel, init_packet, |
0c3b7b2f S |
586 | sizeof(struct nvsp_message), |
587 | (unsigned long)init_packet, | |
588 | VM_PKT_DATA_INBAND, 0); | |
0f48c72c | 589 | if (ret != 0) |
0c3b7b2f | 590 | goto cleanup; |
454f18a9 | 591 | |
99d3016d | 592 | |
8b532797 | 593 | ret = netvsc_init_buf(device, net_device, device_info); |
fceaf24a | 594 | |
0c3b7b2f | 595 | cleanup: |
fceaf24a HJ |
596 | return ret; |
597 | } | |
598 | ||
3e189519 | 599 | /* |
5a71ae30 | 600 | * netvsc_device_remove - Callback when the root bus device is removed |
21a80820 | 601 | */ |
e08f3ea5 | 602 | void netvsc_device_remove(struct hv_device *device) |
fceaf24a | 603 | { |
3d541ac5 VK |
604 | struct net_device *ndev = hv_get_drvdata(device); |
605 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
79e8cbe7 | 606 | struct netvsc_device *net_device |
607 | = rtnl_dereference(net_device_ctx->nvdev); | |
15a863bf | 608 | int i; |
fceaf24a | 609 | |
db2b6498 MG |
610 | /* |
611 | * Revoke receive buffer. If host is pre-Win2016 then tear down | |
612 | * receive buffer GPADL. Do the same for send buffer. | |
613 | */ | |
caf13133 | 614 | netvsc_revoke_recv_buf(device, net_device); |
db2b6498 MG |
615 | if (vmbus_proto_version < VERSION_WIN10) |
616 | netvsc_teardown_recv_gpadl(device, net_device); | |
617 | ||
caf13133 | 618 | netvsc_revoke_send_buf(device, net_device); |
db2b6498 MG |
619 | if (vmbus_proto_version < VERSION_WIN10) |
620 | netvsc_teardown_send_gpadl(device, net_device); | |
9d88f33a | 621 | |
545a8e79 | 622 | RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
3852409b | 623 | |
c0ddcaa8 SH |
624 | /* And disassociate NAPI context from device */ |
625 | for (i = 0; i < net_device->num_chn; i++) | |
626 | netif_napi_del(&net_device->chan_table[i].napi); | |
627 | ||
86c921af S |
628 | /* |
629 | * At this point, no one should be accessing net_device | |
630 | * except in here | |
631 | */ | |
93ba2222 | 632 | netdev_dbg(ndev, "net device safe to remove\n"); |
fceaf24a | 633 | |
454f18a9 | 634 | /* Now, we can close the channel safely */ |
85799a37 | 635 | vmbus_close(device->channel); |
fceaf24a | 636 | |
db2b6498 MG |
637 | /* |
638 | * If host is Win2016 or higher then we do the GPADL tear down | |
639 | * here after VMBus is closed. | |
640 | */ | |
caf13133 MG |
641 | if (vmbus_proto_version >= VERSION_WIN10) { |
642 | netvsc_teardown_recv_gpadl(device, net_device); | |
643 | netvsc_teardown_send_gpadl(device, net_device); | |
644 | } | |
0cf73780 | 645 | |
454f18a9 | 646 | /* Release all resources */ |
545a8e79 | 647 | free_netvsc_device_rcu(net_device); |
fceaf24a HJ |
648 | } |
649 | ||
33be96e4 HZ |
650 | #define RING_AVAIL_PERCENT_HIWATER 20 |
651 | #define RING_AVAIL_PERCENT_LOWATER 10 | |
652 | ||
653 | /* | |
654 | * Get the percentage of available bytes to write in the ring. | |
655 | * The return value is in range from 0 to 100. | |
656 | */ | |
657 | static inline u32 hv_ringbuf_avail_percent( | |
658 | struct hv_ring_buffer_info *ring_info) | |
659 | { | |
660 | u32 avail_read, avail_write; | |
661 | ||
662 | hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write); | |
663 | ||
664 | return avail_write * 100 / ring_info->ring_datasize; | |
665 | } | |
666 | ||
c25aaf81 KS |
667 | static inline void netvsc_free_send_slot(struct netvsc_device *net_device, |
668 | u32 index) | |
669 | { | |
670 | sync_change_bit(index, net_device->send_section_map); | |
671 | } | |
672 | ||
bc304dd3 SH |
673 | static void netvsc_send_tx_complete(struct netvsc_device *net_device, |
674 | struct vmbus_channel *incoming_channel, | |
675 | struct hv_device *device, | |
f9645430 | 676 | const struct vmpacket_descriptor *desc, |
677 | int budget) | |
bc304dd3 | 678 | { |
50698d80 | 679 | struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id; |
bc304dd3 | 680 | struct net_device *ndev = hv_get_drvdata(device); |
09af87d1 | 681 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
bc304dd3 | 682 | struct vmbus_channel *channel = device->channel; |
bc304dd3 SH |
683 | u16 q_idx = 0; |
684 | int queue_sends; | |
685 | ||
686 | /* Notify the layer above us */ | |
687 | if (likely(skb)) { | |
793e3955 | 688 | const struct hv_netvsc_packet *packet |
bc304dd3 | 689 | = (struct hv_netvsc_packet *)skb->cb; |
793e3955 | 690 | u32 send_index = packet->send_buf_index; |
691 | struct netvsc_stats *tx_stats; | |
bc304dd3 SH |
692 | |
693 | if (send_index != NETVSC_INVALID_INDEX) | |
694 | netvsc_free_send_slot(net_device, send_index); | |
793e3955 | 695 | q_idx = packet->q_idx; |
bc304dd3 SH |
696 | channel = incoming_channel; |
697 | ||
6c80f3fc | 698 | tx_stats = &net_device->chan_table[q_idx].tx_stats; |
793e3955 | 699 | |
700 | u64_stats_update_begin(&tx_stats->syncp); | |
701 | tx_stats->packets += packet->total_packets; | |
702 | tx_stats->bytes += packet->total_bytes; | |
703 | u64_stats_update_end(&tx_stats->syncp); | |
704 | ||
f9645430 | 705 | napi_consume_skb(skb, budget); |
bc304dd3 SH |
706 | } |
707 | ||
b8b835a8 | 708 | queue_sends = |
709 | atomic_dec_return(&net_device->chan_table[q_idx].queue_sends); | |
bc304dd3 | 710 | |
cef03981 SH |
711 | if (unlikely(net_device->destroy)) { |
712 | if (queue_sends == 0) | |
713 | wake_up(&net_device->wait_drain); | |
714 | } else { | |
715 | struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx); | |
716 | ||
a1979526 | 717 | if (netif_tx_queue_stopped(txq) && !net_device->tx_disable && |
cef03981 SH |
718 | (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER || |
719 | queue_sends < 1)) { | |
720 | netif_tx_wake_queue(txq); | |
721 | ndev_ctx->eth_stats.wake_queue++; | |
722 | } | |
09af87d1 | 723 | } |
bc304dd3 SH |
724 | } |
725 | ||
97c1723a | 726 | static void netvsc_send_completion(struct netvsc_device *net_device, |
25b85ee8 | 727 | struct vmbus_channel *incoming_channel, |
97c1723a | 728 | struct hv_device *device, |
f9645430 | 729 | const struct vmpacket_descriptor *desc, |
730 | int budget) | |
fceaf24a | 731 | { |
f3dd3f47 | 732 | struct nvsp_message *nvsp_packet = hv_pkt_data(desc); |
3d541ac5 | 733 | struct net_device *ndev = hv_get_drvdata(device); |
fceaf24a | 734 | |
bc304dd3 SH |
735 | switch (nvsp_packet->hdr.msg_type) { |
736 | case NVSP_MSG_TYPE_INIT_COMPLETE: | |
737 | case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE: | |
738 | case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE: | |
739 | case NVSP_MSG5_TYPE_SUBCHANNEL: | |
454f18a9 | 740 | /* Copy the response back */ |
53d21fdb | 741 | memcpy(&net_device->channel_init_pkt, nvsp_packet, |
21a80820 | 742 | sizeof(struct nvsp_message)); |
35abb21a | 743 | complete(&net_device->channel_init_wait); |
bc304dd3 SH |
744 | break; |
745 | ||
746 | case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE: | |
747 | netvsc_send_tx_complete(net_device, incoming_channel, | |
f9645430 | 748 | device, desc, budget); |
bc304dd3 | 749 | break; |
fceaf24a | 750 | |
bc304dd3 SH |
751 | default: |
752 | netdev_err(ndev, | |
753 | "Unknown send completion type %d received!!\n", | |
754 | nvsp_packet->hdr.msg_type); | |
fceaf24a | 755 | } |
fceaf24a HJ |
756 | } |
757 | ||
c25aaf81 KS |
758 | static u32 netvsc_get_next_send_section(struct netvsc_device *net_device) |
759 | { | |
b58a1858 | 760 | unsigned long *map_addr = net_device->send_section_map; |
761 | unsigned int i; | |
762 | ||
fdfb70d2 | 763 | for_each_clear_bit(i, map_addr, net_device->send_section_cnt) { |
b58a1858 | 764 | if (sync_test_and_set_bit(i, map_addr) == 0) |
765 | return i; | |
c25aaf81 | 766 | } |
b58a1858 | 767 | |
768 | return NETVSC_INVALID_INDEX; | |
c25aaf81 KS |
769 | } |
770 | ||
706b71d5 SH |
771 | static void netvsc_copy_to_send_buf(struct netvsc_device *net_device, |
772 | unsigned int section_index, | |
773 | u32 pend_size, | |
774 | struct hv_netvsc_packet *packet, | |
775 | struct rndis_message *rndis_msg, | |
776 | struct hv_page_buffer *pb, | |
777 | bool xmit_more) | |
c25aaf81 KS |
778 | { |
779 | char *start = net_device->send_buf; | |
7c3877f2 HZ |
780 | char *dest = start + (section_index * net_device->send_section_size) |
781 | + pend_size; | |
c25aaf81 KS |
782 | int i; |
783 | u32 msg_size = 0; | |
7c3877f2 HZ |
784 | u32 padding = 0; |
785 | u32 remain = packet->total_data_buflen % net_device->pkt_align; | |
aa0a34be HZ |
786 | u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt : |
787 | packet->page_buf_cnt; | |
7c3877f2 HZ |
788 | |
789 | /* Add padding */ | |
706b71d5 SH |
790 | remain = packet->total_data_buflen & (net_device->pkt_align - 1); |
791 | if (xmit_more && remain) { | |
7c3877f2 | 792 | padding = net_device->pkt_align - remain; |
24476760 | 793 | rndis_msg->msg_len += padding; |
7c3877f2 HZ |
794 | packet->total_data_buflen += padding; |
795 | } | |
c25aaf81 | 796 | |
aa0a34be | 797 | for (i = 0; i < page_count; i++) { |
02b6de01 | 798 | char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT); |
799 | u32 offset = pb[i].offset; | |
800 | u32 len = pb[i].len; | |
c25aaf81 KS |
801 | |
802 | memcpy(dest, (src + offset), len); | |
803 | msg_size += len; | |
804 | dest += len; | |
805 | } | |
7c3877f2 HZ |
806 | |
807 | if (padding) { | |
808 | memset(dest, 0, padding); | |
809 | msg_size += padding; | |
810 | } | |
c25aaf81 KS |
811 | } |
812 | ||
3a8963ac | 813 | static inline int netvsc_send_pkt( |
0a1275ca | 814 | struct hv_device *device, |
7c3877f2 | 815 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 816 | struct netvsc_device *net_device, |
02b6de01 | 817 | struct hv_page_buffer *pb, |
3a3d9a0a | 818 | struct sk_buff *skb) |
fceaf24a | 819 | { |
7c3877f2 | 820 | struct nvsp_message nvmsg; |
956a25c9 JP |
821 | struct nvsp_1_message_send_rndis_packet * const rpkt = |
822 | &nvmsg.msg.v1_msg.send_rndis_pkt; | |
823 | struct netvsc_channel * const nvchan = | |
824 | &net_device->chan_table[packet->q_idx]; | |
b8b835a8 | 825 | struct vmbus_channel *out_channel = nvchan->channel; |
0a1275ca | 826 | struct net_device *ndev = hv_get_drvdata(device); |
09af87d1 | 827 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
b8b835a8 | 828 | struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx); |
7c3877f2 HZ |
829 | u64 req_id; |
830 | int ret; | |
82fa3c77 | 831 | u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound); |
c25aaf81 | 832 | |
7c3877f2 | 833 | nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; |
956a25c9 JP |
834 | if (skb) |
835 | rpkt->channel_type = 0; /* 0 is RMC_DATA */ | |
836 | else | |
837 | rpkt->channel_type = 1; /* 1 is RMC_CONTROL */ | |
fceaf24a | 838 | |
956a25c9 | 839 | rpkt->send_buf_section_index = packet->send_buf_index; |
7c3877f2 | 840 | if (packet->send_buf_index == NETVSC_INVALID_INDEX) |
956a25c9 | 841 | rpkt->send_buf_section_size = 0; |
7c3877f2 | 842 | else |
956a25c9 | 843 | rpkt->send_buf_section_size = packet->total_data_buflen; |
21a80820 | 844 | |
3a3d9a0a | 845 | req_id = (ulong)skb; |
f1ea3cd7 | 846 | |
c3582a2c HZ |
847 | if (out_channel->rescind) |
848 | return -ENODEV; | |
849 | ||
72a2f5bd | 850 | if (packet->page_buf_cnt) { |
02b6de01 | 851 | if (packet->cp_partial) |
852 | pb += packet->rmsg_pgcnt; | |
853 | ||
5a668d8c | 854 | ret = vmbus_sendpacket_pagebuffer(out_channel, |
855 | pb, packet->page_buf_cnt, | |
856 | &nvmsg, sizeof(nvmsg), | |
857 | req_id); | |
21a80820 | 858 | } else { |
5dd0fb9b | 859 | ret = vmbus_sendpacket(out_channel, |
860 | &nvmsg, sizeof(nvmsg), | |
861 | req_id, VM_PKT_DATA_INBAND, | |
862 | VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); | |
fceaf24a HJ |
863 | } |
864 | ||
1d06825b | 865 | if (ret == 0) { |
b8b835a8 | 866 | atomic_inc_return(&nvchan->queue_sends); |
5b54dac8 | 867 | |
09af87d1 | 868 | if (ring_avail < RING_AVAIL_PERCENT_LOWATER) { |
b8b835a8 | 869 | netif_tx_stop_queue(txq); |
09af87d1 SX |
870 | ndev_ctx->eth_stats.stop_queue++; |
871 | } | |
1d06825b | 872 | } else if (ret == -EAGAIN) { |
b8b835a8 | 873 | netif_tx_stop_queue(txq); |
09af87d1 | 874 | ndev_ctx->eth_stats.stop_queue++; |
1d06825b | 875 | } else { |
4a2176c6 | 876 | netdev_err(ndev, |
877 | "Unable to send packet pages %u len %u, ret %d\n", | |
878 | packet->page_buf_cnt, packet->total_data_buflen, | |
879 | ret); | |
1d06825b | 880 | } |
fceaf24a | 881 | |
878d937e HZ |
882 | if (netif_tx_queue_stopped(txq) && |
883 | atomic_read(&nvchan->queue_sends) < 1 && | |
884 | !net_device->tx_disable) { | |
885 | netif_tx_wake_queue(txq); | |
886 | ndev_ctx->eth_stats.wake_queue++; | |
887 | if (ret == -EAGAIN) | |
888 | ret = -ENOSPC; | |
889 | } | |
890 | ||
7c3877f2 HZ |
891 | return ret; |
892 | } | |
893 | ||
c85e4924 HZ |
894 | /* Move packet out of multi send data (msd), and clear msd */ |
895 | static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send, | |
896 | struct sk_buff **msd_skb, | |
897 | struct multi_send_data *msdp) | |
898 | { | |
899 | *msd_skb = msdp->skb; | |
900 | *msd_send = msdp->pkt; | |
901 | msdp->skb = NULL; | |
902 | msdp->pkt = NULL; | |
903 | msdp->count = 0; | |
904 | } | |
905 | ||
2a926f79 | 906 | /* RCU already held by caller */ |
706b71d5 | 907 | int netvsc_send(struct net_device *ndev, |
24476760 | 908 | struct hv_netvsc_packet *packet, |
a9f2e2d6 | 909 | struct rndis_message *rndis_msg, |
02b6de01 | 910 | struct hv_page_buffer *pb, |
3a3d9a0a | 911 | struct sk_buff *skb) |
7c3877f2 | 912 | { |
706b71d5 | 913 | struct net_device_context *ndev_ctx = netdev_priv(ndev); |
3962981f | 914 | struct netvsc_device *net_device |
867047c4 | 915 | = rcu_dereference_bh(ndev_ctx->nvdev); |
2a926f79 | 916 | struct hv_device *device = ndev_ctx->device_ctx; |
6c4c137e | 917 | int ret = 0; |
b8b835a8 | 918 | struct netvsc_channel *nvchan; |
7c3877f2 HZ |
919 | u32 pktlen = packet->total_data_buflen, msd_len = 0; |
920 | unsigned int section_index = NETVSC_INVALID_INDEX; | |
7c3877f2 HZ |
921 | struct multi_send_data *msdp; |
922 | struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL; | |
c85e4924 | 923 | struct sk_buff *msd_skb = NULL; |
706b71d5 | 924 | bool try_batch, xmit_more; |
7c3877f2 | 925 | |
592b4fe8 | 926 | /* If device is rescinded, return error and packet will get dropped. */ |
2a926f79 | 927 | if (unlikely(!net_device || net_device->destroy)) |
7c3877f2 HZ |
928 | return -ENODEV; |
929 | ||
b8b835a8 | 930 | nvchan = &net_device->chan_table[packet->q_idx]; |
7c3877f2 | 931 | packet->send_buf_index = NETVSC_INVALID_INDEX; |
aa0a34be | 932 | packet->cp_partial = false; |
7c3877f2 | 933 | |
cf8190e4 HZ |
934 | /* Send control message directly without accessing msd (Multi-Send |
935 | * Data) field which may be changed during data packet processing. | |
936 | */ | |
4d1060fe SH |
937 | if (!skb) |
938 | return netvsc_send_pkt(device, packet, net_device, pb, skb); | |
cf8190e4 | 939 | |
7c3877f2 | 940 | /* batch packets in send buffer if possible */ |
b8b835a8 | 941 | msdp = &nvchan->msd; |
7c3877f2 HZ |
942 | if (msdp->pkt) |
943 | msd_len = msdp->pkt->total_data_buflen; | |
944 | ||
ebc1dcf6 | 945 | try_batch = msd_len > 0 && msdp->count < net_device->max_pkt; |
aa0a34be | 946 | if (try_batch && msd_len + pktlen + net_device->pkt_align < |
7c3877f2 HZ |
947 | net_device->send_section_size) { |
948 | section_index = msdp->pkt->send_buf_index; | |
949 | ||
aa0a34be HZ |
950 | } else if (try_batch && msd_len + packet->rmsg_size < |
951 | net_device->send_section_size) { | |
952 | section_index = msdp->pkt->send_buf_index; | |
953 | packet->cp_partial = true; | |
954 | ||
ebc1dcf6 | 955 | } else if (pktlen + net_device->pkt_align < |
7c3877f2 HZ |
956 | net_device->send_section_size) { |
957 | section_index = netvsc_get_next_send_section(net_device); | |
cad5c197 | 958 | if (unlikely(section_index == NETVSC_INVALID_INDEX)) { |
959 | ++ndev_ctx->eth_stats.tx_send_full; | |
960 | } else { | |
c85e4924 HZ |
961 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
962 | msd_len = 0; | |
7c3877f2 HZ |
963 | } |
964 | } | |
965 | ||
706b71d5 SH |
966 | /* Keep aggregating only if stack says more data is coming |
967 | * and not doing mixed modes send and not flow blocked | |
968 | */ | |
969 | xmit_more = skb->xmit_more && | |
970 | !packet->cp_partial && | |
971 | !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx)); | |
972 | ||
7c3877f2 HZ |
973 | if (section_index != NETVSC_INVALID_INDEX) { |
974 | netvsc_copy_to_send_buf(net_device, | |
975 | section_index, msd_len, | |
706b71d5 | 976 | packet, rndis_msg, pb, xmit_more); |
b08cc791 | 977 | |
7c3877f2 | 978 | packet->send_buf_index = section_index; |
aa0a34be HZ |
979 | |
980 | if (packet->cp_partial) { | |
981 | packet->page_buf_cnt -= packet->rmsg_pgcnt; | |
982 | packet->total_data_buflen = msd_len + packet->rmsg_size; | |
983 | } else { | |
984 | packet->page_buf_cnt = 0; | |
985 | packet->total_data_buflen += msd_len; | |
aa0a34be | 986 | } |
7c3877f2 | 987 | |
793e3955 | 988 | if (msdp->pkt) { |
989 | packet->total_packets += msdp->pkt->total_packets; | |
990 | packet->total_bytes += msdp->pkt->total_bytes; | |
991 | } | |
992 | ||
c85e4924 | 993 | if (msdp->skb) |
17db4bce | 994 | dev_consume_skb_any(msdp->skb); |
ee90b812 | 995 | |
706b71d5 | 996 | if (xmit_more) { |
c85e4924 | 997 | msdp->skb = skb; |
7c3877f2 HZ |
998 | msdp->pkt = packet; |
999 | msdp->count++; | |
1000 | } else { | |
1001 | cur_send = packet; | |
c85e4924 | 1002 | msdp->skb = NULL; |
7c3877f2 HZ |
1003 | msdp->pkt = NULL; |
1004 | msdp->count = 0; | |
1005 | } | |
1006 | } else { | |
c85e4924 | 1007 | move_pkt_msd(&msd_send, &msd_skb, msdp); |
7c3877f2 HZ |
1008 | cur_send = packet; |
1009 | } | |
1010 | ||
7c3877f2 | 1011 | if (msd_send) { |
6c4c137e SH |
1012 | int m_ret = netvsc_send_pkt(device, msd_send, net_device, |
1013 | NULL, msd_skb); | |
7c3877f2 HZ |
1014 | |
1015 | if (m_ret != 0) { | |
1016 | netvsc_free_send_slot(net_device, | |
1017 | msd_send->send_buf_index); | |
c85e4924 | 1018 | dev_kfree_skb_any(msd_skb); |
7c3877f2 HZ |
1019 | } |
1020 | } | |
1021 | ||
1022 | if (cur_send) | |
0a1275ca | 1023 | ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb); |
7c3877f2 | 1024 | |
7aab5159 JS |
1025 | if (ret != 0 && section_index != NETVSC_INVALID_INDEX) |
1026 | netvsc_free_send_slot(net_device, section_index); | |
d953ca4d | 1027 | |
fceaf24a HJ |
1028 | return ret; |
1029 | } | |
1030 | ||
7426b1a5 | 1031 | /* Send pending recv completions */ |
cad5c197 | 1032 | static int send_recv_completions(struct net_device *ndev, |
1033 | struct netvsc_device *nvdev, | |
1034 | struct netvsc_channel *nvchan) | |
5fa9d3c5 | 1035 | { |
7426b1a5 | 1036 | struct multi_recv_comp *mrc = &nvchan->mrc; |
1037 | struct recv_comp_msg { | |
1038 | struct nvsp_message_header hdr; | |
1039 | u32 status; | |
1040 | } __packed; | |
1041 | struct recv_comp_msg msg = { | |
1042 | .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE, | |
1043 | }; | |
5fa9d3c5 HZ |
1044 | int ret; |
1045 | ||
7426b1a5 | 1046 | while (mrc->first != mrc->next) { |
1047 | const struct recv_comp_data *rcd | |
1048 | = mrc->slots + mrc->first; | |
c0b558e5 | 1049 | |
7426b1a5 | 1050 | msg.status = rcd->status; |
1051 | ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg), | |
1052 | rcd->tid, VM_PKT_COMP, 0); | |
cad5c197 | 1053 | if (unlikely(ret)) { |
1054 | struct net_device_context *ndev_ctx = netdev_priv(ndev); | |
1055 | ||
1056 | ++ndev_ctx->eth_stats.rx_comp_busy; | |
7426b1a5 | 1057 | return ret; |
cad5c197 | 1058 | } |
c0b558e5 | 1059 | |
7426b1a5 | 1060 | if (++mrc->first == nvdev->recv_completion_cnt) |
1061 | mrc->first = 0; | |
1062 | } | |
c0b558e5 | 1063 | |
7426b1a5 | 1064 | /* receive completion ring has been emptied */ |
1065 | if (unlikely(nvdev->destroy)) | |
1066 | wake_up(&nvdev->wait_drain); | |
c0b558e5 | 1067 | |
7426b1a5 | 1068 | return 0; |
c0b558e5 HZ |
1069 | } |
1070 | ||
7426b1a5 | 1071 | /* Count how many receive completions are outstanding */ |
1072 | static void recv_comp_slot_avail(const struct netvsc_device *nvdev, | |
1073 | const struct multi_recv_comp *mrc, | |
1074 | u32 *filled, u32 *avail) | |
c0b558e5 | 1075 | { |
7426b1a5 | 1076 | u32 count = nvdev->recv_completion_cnt; |
c0b558e5 | 1077 | |
7426b1a5 | 1078 | if (mrc->next >= mrc->first) |
1079 | *filled = mrc->next - mrc->first; | |
1080 | else | |
1081 | *filled = (count - mrc->first) + mrc->next; | |
c0b558e5 | 1082 | |
7426b1a5 | 1083 | *avail = count - *filled - 1; |
c0b558e5 HZ |
1084 | } |
1085 | ||
7426b1a5 | 1086 | /* Add receive complete to ring to send to host. */ |
1087 | static void enq_receive_complete(struct net_device *ndev, | |
1088 | struct netvsc_device *nvdev, u16 q_idx, | |
1089 | u64 tid, u32 status) | |
c0b558e5 | 1090 | { |
7426b1a5 | 1091 | struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx]; |
1092 | struct multi_recv_comp *mrc = &nvchan->mrc; | |
c0b558e5 | 1093 | struct recv_comp_data *rcd; |
7426b1a5 | 1094 | u32 filled, avail; |
c0b558e5 | 1095 | |
7426b1a5 | 1096 | recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
c0b558e5 | 1097 | |
7426b1a5 | 1098 | if (unlikely(filled > NAPI_POLL_WEIGHT)) { |
cad5c197 | 1099 | send_recv_completions(ndev, nvdev, nvchan); |
7426b1a5 | 1100 | recv_comp_slot_avail(nvdev, mrc, &filled, &avail); |
5fa9d3c5 | 1101 | } |
c0b558e5 | 1102 | |
7426b1a5 | 1103 | if (unlikely(!avail)) { |
1104 | netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n", | |
1105 | q_idx, tid); | |
1106 | return; | |
1107 | } | |
c0b558e5 | 1108 | |
7426b1a5 | 1109 | rcd = mrc->slots + mrc->next; |
1110 | rcd->tid = tid; | |
1111 | rcd->status = status; | |
c0b558e5 | 1112 | |
7426b1a5 | 1113 | if (++mrc->next == nvdev->recv_completion_cnt) |
1114 | mrc->next = 0; | |
c0b558e5 HZ |
1115 | } |
1116 | ||
15a863bf | 1117 | static int netvsc_receive(struct net_device *ndev, |
7426b1a5 | 1118 | struct netvsc_device *net_device, |
1119 | struct net_device_context *net_device_ctx, | |
1120 | struct hv_device *device, | |
1121 | struct vmbus_channel *channel, | |
1122 | const struct vmpacket_descriptor *desc, | |
1123 | struct nvsp_message *nvsp) | |
fceaf24a | 1124 | { |
f3dd3f47 | 1125 | const struct vmtransfer_page_packet_header *vmxferpage_packet |
1126 | = container_of(desc, const struct vmtransfer_page_packet_header, d); | |
15a863bf | 1127 | u16 q_idx = channel->offermsg.offer.sub_channel_index; |
dc54a08c | 1128 | char *recv_buf = net_device->recv_buf; |
4baab261 | 1129 | u32 status = NVSP_STAT_SUCCESS; |
45326342 HZ |
1130 | int i; |
1131 | int count = 0; | |
779b4d17 | 1132 | |
454f18a9 | 1133 | /* Make sure this is a valid nvsp packet */ |
dc54a08c | 1134 | if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) { |
1135 | netif_err(net_device_ctx, rx_err, ndev, | |
1136 | "Unknown nvsp packet type received %u\n", | |
1137 | nvsp->hdr.msg_type); | |
15a863bf | 1138 | return 0; |
fceaf24a HJ |
1139 | } |
1140 | ||
dc54a08c | 1141 | if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) { |
1142 | netif_err(net_device_ctx, rx_err, ndev, | |
1143 | "Invalid xfer page set id - expecting %x got %x\n", | |
1144 | NETVSC_RECEIVE_BUFFER_ID, | |
1145 | vmxferpage_packet->xfer_pageset_id); | |
15a863bf | 1146 | return 0; |
fceaf24a HJ |
1147 | } |
1148 | ||
4baab261 | 1149 | count = vmxferpage_packet->range_cnt; |
fceaf24a | 1150 | |
454f18a9 | 1151 | /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */ |
4baab261 | 1152 | for (i = 0; i < count; i++) { |
dc54a08c | 1153 | void *data = recv_buf |
1154 | + vmxferpage_packet->ranges[i].byte_offset; | |
1155 | u32 buflen = vmxferpage_packet->ranges[i].byte_count; | |
8139bb20 | 1156 | int ret; |
fceaf24a | 1157 | |
454f18a9 | 1158 | /* Pass it to the upper layer */ |
8139bb20 | 1159 | ret = rndis_filter_receive(ndev, net_device, device, |
dc54a08c | 1160 | channel, data, buflen); |
8139bb20 HZ |
1161 | |
1162 | if (unlikely(ret != NVSP_STAT_SUCCESS)) | |
1163 | status = NVSP_STAT_FAIL; | |
fceaf24a HJ |
1164 | } |
1165 | ||
7426b1a5 | 1166 | enq_receive_complete(ndev, net_device, q_idx, |
1167 | vmxferpage_packet->d.trans_id, status); | |
15a863bf | 1168 | |
15a863bf | 1169 | return count; |
fceaf24a HJ |
1170 | } |
1171 | ||
5b54dac8 | 1172 | static void netvsc_send_table(struct hv_device *hdev, |
71790a27 | 1173 | struct nvsp_message *nvmsg) |
5b54dac8 | 1174 | { |
0a1275ca | 1175 | struct net_device *ndev = hv_get_drvdata(hdev); |
7ce10124 | 1176 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
5b54dac8 HZ |
1177 | int i; |
1178 | u32 count, *tab; | |
1179 | ||
5b54dac8 HZ |
1180 | count = nvmsg->msg.v5_msg.send_table.count; |
1181 | if (count != VRSS_SEND_TAB_SIZE) { | |
1182 | netdev_err(ndev, "Received wrong send-table size:%u\n", count); | |
1183 | return; | |
1184 | } | |
1185 | ||
1186 | tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table + | |
1187 | nvmsg->msg.v5_msg.send_table.offset); | |
1188 | ||
1189 | for (i = 0; i < count; i++) | |
39e91cfb | 1190 | net_device_ctx->tx_table[i] = tab[i]; |
5b54dac8 HZ |
1191 | } |
1192 | ||
f9a7da91 | 1193 | static void netvsc_send_vf(struct net_device_context *net_device_ctx, |
71790a27 HZ |
1194 | struct nvsp_message *nvmsg) |
1195 | { | |
f9a7da91 VK |
1196 | net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; |
1197 | net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; | |
71790a27 HZ |
1198 | } |
1199 | ||
1200 | static inline void netvsc_receive_inband(struct hv_device *hdev, | |
f9a7da91 VK |
1201 | struct net_device_context *net_device_ctx, |
1202 | struct nvsp_message *nvmsg) | |
71790a27 HZ |
1203 | { |
1204 | switch (nvmsg->hdr.msg_type) { | |
1205 | case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE: | |
1206 | netvsc_send_table(hdev, nvmsg); | |
1207 | break; | |
1208 | ||
1209 | case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION: | |
f9a7da91 | 1210 | netvsc_send_vf(net_device_ctx, nvmsg); |
71790a27 HZ |
1211 | break; |
1212 | } | |
1213 | } | |
1214 | ||
15a863bf | 1215 | static int netvsc_process_raw_pkt(struct hv_device *device, |
1216 | struct vmbus_channel *channel, | |
1217 | struct netvsc_device *net_device, | |
1218 | struct net_device *ndev, | |
f9645430 | 1219 | const struct vmpacket_descriptor *desc, |
1220 | int budget) | |
99a50bb1 | 1221 | { |
f9a7da91 | 1222 | struct net_device_context *net_device_ctx = netdev_priv(ndev); |
f3dd3f47 | 1223 | struct nvsp_message *nvmsg = hv_pkt_data(desc); |
99a50bb1 S |
1224 | |
1225 | switch (desc->type) { | |
1226 | case VM_PKT_COMP: | |
f9645430 | 1227 | netvsc_send_completion(net_device, channel, device, |
1228 | desc, budget); | |
99a50bb1 S |
1229 | break; |
1230 | ||
1231 | case VM_PKT_DATA_USING_XFER_PAGES: | |
15a863bf | 1232 | return netvsc_receive(ndev, net_device, net_device_ctx, |
1233 | device, channel, desc, nvmsg); | |
99a50bb1 S |
1234 | break; |
1235 | ||
1236 | case VM_PKT_DATA_INBAND: | |
f9a7da91 | 1237 | netvsc_receive_inband(device, net_device_ctx, nvmsg); |
99a50bb1 S |
1238 | break; |
1239 | ||
1240 | default: | |
1241 | netdev_err(ndev, "unhandled packet type %d, tid %llx\n", | |
f4f1c23d | 1242 | desc->type, desc->trans_id); |
99a50bb1 S |
1243 | break; |
1244 | } | |
15a863bf | 1245 | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel) | |
1250 | { | |
1251 | struct vmbus_channel *primary = channel->primary_channel; | |
1252 | ||
1253 | return primary ? primary->device_obj : channel->device_obj; | |
1254 | } | |
1255 | ||
262b7f14 | 1256 | /* Network processing softirq |
1257 | * Process data in incoming ring buffer from host | |
1258 | * Stops when ring is empty or budget is met or exceeded. | |
1259 | */ | |
15a863bf | 1260 | int netvsc_poll(struct napi_struct *napi, int budget) |
1261 | { | |
1262 | struct netvsc_channel *nvchan | |
1263 | = container_of(napi, struct netvsc_channel, napi); | |
35fbbccf | 1264 | struct netvsc_device *net_device = nvchan->net_device; |
15a863bf | 1265 | struct vmbus_channel *channel = nvchan->channel; |
1266 | struct hv_device *device = netvsc_channel_to_device(channel); | |
15a863bf | 1267 | struct net_device *ndev = hv_get_drvdata(device); |
15a863bf | 1268 | int work_done = 0; |
f3a13c57 | 1269 | int ret; |
15a863bf | 1270 | |
f4f1c23d | 1271 | /* If starting a new interval */ |
1272 | if (!nvchan->desc) | |
1273 | nvchan->desc = hv_pkt_iter_first(channel); | |
15a863bf | 1274 | |
f4f1c23d | 1275 | while (nvchan->desc && work_done < budget) { |
1276 | work_done += netvsc_process_raw_pkt(device, channel, net_device, | |
f9645430 | 1277 | ndev, nvchan->desc, budget); |
f4f1c23d | 1278 | nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); |
15a863bf | 1279 | } |
15a863bf | 1280 | |
f3a13c57 HZ |
1281 | /* Send any pending receive completions */ |
1282 | ret = send_recv_completions(ndev, net_device, nvchan); | |
1283 | ||
1284 | /* If it did not exhaust NAPI budget this time | |
1285 | * and not doing busy poll | |
f4e40363 | 1286 | * then re-enable host interrupts |
f3a13c57 HZ |
1287 | * and reschedule if ring is not empty |
1288 | * or sending receive completion failed. | |
262b7f14 | 1289 | */ |
f3a13c57 | 1290 | if (work_done < budget && |
15a863bf | 1291 | napi_complete_done(napi, work_done) && |
f3a13c57 | 1292 | (ret || hv_end_read(&channel->inbound)) && |
1ae20708 | 1293 | napi_schedule_prep(napi)) { |
7426b1a5 | 1294 | hv_begin_read(&channel->inbound); |
1ae20708 | 1295 | __napi_schedule(napi); |
7426b1a5 | 1296 | } |
f4f1c23d | 1297 | |
1298 | /* Driver may overshoot since multiple packets per descriptor */ | |
1299 | return min(work_done, budget); | |
99a50bb1 S |
1300 | } |
1301 | ||
262b7f14 | 1302 | /* Call back when data is available in host ring buffer. |
1303 | * Processing is deferred until network softirq (NAPI) | |
1304 | */ | |
5b54dac8 | 1305 | void netvsc_channel_cb(void *context) |
fceaf24a | 1306 | { |
6de38af6 | 1307 | struct netvsc_channel *nvchan = context; |
43bf99ce | 1308 | struct vmbus_channel *channel = nvchan->channel; |
1309 | struct hv_ring_buffer_info *rbi = &channel->inbound; | |
1310 | ||
1311 | /* preload first vmpacket descriptor */ | |
1312 | prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index); | |
0b307ebd | 1313 | |
f4f1c23d | 1314 | if (napi_schedule_prep(&nvchan->napi)) { |
1315 | /* disable interupts from host */ | |
43bf99ce | 1316 | hv_begin_read(rbi); |
0d6dd357 | 1317 | |
b067106f | 1318 | __napi_schedule_irqoff(&nvchan->napi); |
f4f1c23d | 1319 | } |
fceaf24a | 1320 | } |
af24ce42 | 1321 | |
b637e023 HZ |
1322 | /* |
1323 | * netvsc_device_add - Callback when the device belonging to this | |
1324 | * driver is added | |
1325 | */ | |
9749fed5 | 1326 | struct netvsc_device *netvsc_device_add(struct hv_device *device, |
1327 | const struct netvsc_device_info *device_info) | |
b637e023 | 1328 | { |
88098834 | 1329 | int i, ret = 0; |
2c7f83ca | 1330 | int ring_size = device_info->ring_size; |
b637e023 | 1331 | struct netvsc_device *net_device; |
88098834 VK |
1332 | struct net_device *ndev = hv_get_drvdata(device); |
1333 | struct net_device_context *net_device_ctx = netdev_priv(ndev); | |
b637e023 | 1334 | |
88098834 | 1335 | net_device = alloc_net_device(); |
b1c84927 | 1336 | if (!net_device) |
9749fed5 | 1337 | return ERR_PTR(-ENOMEM); |
b637e023 | 1338 | |
6b0cbe31 HZ |
1339 | for (i = 0; i < VRSS_SEND_TAB_SIZE; i++) |
1340 | net_device_ctx->tx_table[i] = 0; | |
1341 | ||
5b54dac8 HZ |
1342 | net_device->ring_size = ring_size; |
1343 | ||
15a863bf | 1344 | /* Because the device uses NAPI, all the interrupt batching and |
1345 | * control is done via Net softirq, not the channel handling | |
1346 | */ | |
1347 | set_channel_read_mode(device->channel, HV_CALL_ISR); | |
1348 | ||
bffb1842 S |
1349 | /* If we're reopening the device we may have multiple queues, fill the |
1350 | * chn_table with the default channel to use it before subchannels are | |
1351 | * opened. | |
1352 | * Initialize the channel state before we open; | |
1353 | * we can be interrupted as soon as we open the channel. | |
1354 | */ | |
1355 | ||
1356 | for (i = 0; i < VRSS_CHANNEL_MAX; i++) { | |
1357 | struct netvsc_channel *nvchan = &net_device->chan_table[i]; | |
1358 | ||
1359 | nvchan->channel = device->channel; | |
35fbbccf | 1360 | nvchan->net_device = net_device; |
4a0dee1f FF |
1361 | u64_stats_init(&nvchan->tx_stats.syncp); |
1362 | u64_stats_init(&nvchan->rx_stats.syncp); | |
bffb1842 S |
1363 | } |
1364 | ||
2be0f264 | 1365 | /* Enable NAPI handler before init callbacks */ |
1366 | netif_napi_add(ndev, &net_device->chan_table[0].napi, | |
1367 | netvsc_poll, NAPI_POLL_WEIGHT); | |
1368 | ||
b637e023 | 1369 | /* Open the channel */ |
aae23986 S |
1370 | ret = vmbus_open(device->channel, ring_size * PAGE_SIZE, |
1371 | ring_size * PAGE_SIZE, NULL, 0, | |
6de38af6 | 1372 | netvsc_channel_cb, |
1373 | net_device->chan_table); | |
b637e023 HZ |
1374 | |
1375 | if (ret != 0) { | |
d9871158 | 1376 | netdev_err(ndev, "unable to open channel: %d\n", ret); |
b637e023 HZ |
1377 | goto cleanup; |
1378 | } | |
1379 | ||
1380 | /* Channel is opened */ | |
93ba2222 | 1381 | netdev_dbg(ndev, "hv_netvsc channel opened successfully\n"); |
b637e023 | 1382 | |
15a863bf | 1383 | napi_enable(&net_device->chan_table[0].napi); |
88098834 | 1384 | |
b637e023 | 1385 | /* Connect with the NetVsp */ |
8b532797 | 1386 | ret = netvsc_connect_vsp(device, net_device, device_info); |
b637e023 | 1387 | if (ret != 0) { |
d9871158 | 1388 | netdev_err(ndev, |
c909ebbd | 1389 | "unable to connect to NetVSP - %d\n", ret); |
b637e023 HZ |
1390 | goto close; |
1391 | } | |
1392 | ||
4d1060fe SH |
1393 | /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is |
1394 | * populated. | |
1395 | */ | |
1396 | rcu_assign_pointer(net_device_ctx->nvdev, net_device); | |
1397 | ||
9749fed5 | 1398 | return net_device; |
b637e023 HZ |
1399 | |
1400 | close: | |
49393347 | 1401 | RCU_INIT_POINTER(net_device_ctx->nvdev, NULL); |
1402 | napi_disable(&net_device->chan_table[0].napi); | |
15a863bf | 1403 | |
b637e023 HZ |
1404 | /* Now, we can close the channel safely */ |
1405 | vmbus_close(device->channel); | |
1406 | ||
1407 | cleanup: | |
3702b029 | 1408 | netif_napi_del(&net_device->chan_table[0].napi); |
545a8e79 | 1409 | free_netvsc_device(&net_device->rcu); |
b637e023 | 1410 | |
9749fed5 | 1411 | return ERR_PTR(ret); |
b637e023 | 1412 | } |