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d314f586 NN |
1 | /* |
2 | * vhost-user.c | |
3 | * | |
4 | * Copyright (c) 2013 Virtual Open Systems Sarl. | |
5 | * | |
6 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
7 | * See the COPYING file in the top-level directory. | |
8 | * | |
9 | */ | |
10 | ||
2744d920 | 11 | #include "qemu/osdep.h" |
d314f586 NN |
12 | #include "clients.h" |
13 | #include "net/vhost_net.h" | |
14 | #include "net/vhost-user.h" | |
15 | #include "sysemu/char.h" | |
03ce5744 | 16 | #include "qemu/config-file.h" |
d314f586 | 17 | #include "qemu/error-report.h" |
b931bfbf | 18 | #include "qmp-commands.h" |
69b32a6c | 19 | #include "trace.h" |
d314f586 NN |
20 | |
21 | typedef struct VhostUserState { | |
22 | NetClientState nc; | |
32a6ebec | 23 | CharBackend chr; |
d314f586 | 24 | VHostNetState *vhost_net; |
6f1de6b7 | 25 | guint watch; |
a463215b | 26 | uint64_t acked_features; |
c89804d6 | 27 | bool started; |
d314f586 NN |
28 | } VhostUserState; |
29 | ||
30 | VHostNetState *vhost_user_get_vhost_net(NetClientState *nc) | |
31 | { | |
32 | VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); | |
f394b2e2 | 33 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
d314f586 NN |
34 | return s->vhost_net; |
35 | } | |
36 | ||
a463215b MAL |
37 | uint64_t vhost_user_get_acked_features(NetClientState *nc) |
38 | { | |
39 | VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); | |
f394b2e2 | 40 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
a463215b MAL |
41 | return s->acked_features; |
42 | } | |
43 | ||
b931bfbf | 44 | static void vhost_user_stop(int queues, NetClientState *ncs[]) |
d314f586 | 45 | { |
b931bfbf CO |
46 | VhostUserState *s; |
47 | int i; | |
d314f586 | 48 | |
b931bfbf | 49 | for (i = 0; i < queues; i++) { |
f394b2e2 | 50 | assert(ncs[i]->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
d314f586 | 51 | |
b931bfbf | 52 | s = DO_UPCAST(VhostUserState, nc, ncs[i]); |
d314f586 | 53 | |
b931bfbf | 54 | if (s->vhost_net) { |
a463215b | 55 | /* save acked features */ |
e6bcb1b6 MAL |
56 | uint64_t features = vhost_net_get_acked_features(s->vhost_net); |
57 | if (features) { | |
58 | s->acked_features = features; | |
59 | } | |
b931bfbf | 60 | vhost_net_cleanup(s->vhost_net); |
b931bfbf CO |
61 | } |
62 | } | |
d314f586 NN |
63 | } |
64 | ||
b931bfbf | 65 | static int vhost_user_start(int queues, NetClientState *ncs[]) |
d314f586 | 66 | { |
b931bfbf | 67 | VhostNetOptions options; |
e6bcb1b6 | 68 | struct vhost_net *net = NULL; |
b931bfbf CO |
69 | VhostUserState *s; |
70 | int max_queues; | |
71 | int i; | |
72 | ||
73 | options.backend_type = VHOST_BACKEND_TYPE_USER; | |
74 | ||
75 | for (i = 0; i < queues; i++) { | |
f394b2e2 | 76 | assert(ncs[i]->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
b931bfbf CO |
77 | |
78 | s = DO_UPCAST(VhostUserState, nc, ncs[i]); | |
b931bfbf CO |
79 | |
80 | options.net_backend = ncs[i]; | |
5345fdb4 | 81 | options.opaque = &s->chr; |
69e87b32 | 82 | options.busyloop_timeout = 0; |
e6bcb1b6 MAL |
83 | net = vhost_net_init(&options); |
84 | if (!net) { | |
9af9e0fe | 85 | error_report("failed to init vhost_net for queue %d", i); |
b931bfbf CO |
86 | goto err; |
87 | } | |
88 | ||
89 | if (i == 0) { | |
e6bcb1b6 | 90 | max_queues = vhost_net_get_max_queues(net); |
b931bfbf | 91 | if (queues > max_queues) { |
9af9e0fe MA |
92 | error_report("you are asking more queues than supported: %d", |
93 | max_queues); | |
b931bfbf CO |
94 | goto err; |
95 | } | |
96 | } | |
e6bcb1b6 MAL |
97 | |
98 | if (s->vhost_net) { | |
99 | vhost_net_cleanup(s->vhost_net); | |
100 | g_free(s->vhost_net); | |
101 | } | |
102 | s->vhost_net = net; | |
d314f586 NN |
103 | } |
104 | ||
b931bfbf CO |
105 | return 0; |
106 | ||
107 | err: | |
e6bcb1b6 MAL |
108 | if (net) { |
109 | vhost_net_cleanup(net); | |
110 | } | |
111 | vhost_user_stop(i, ncs); | |
b931bfbf | 112 | return -1; |
d314f586 NN |
113 | } |
114 | ||
f6f56291 TC |
115 | static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf, |
116 | size_t size) | |
117 | { | |
3e866365 TC |
118 | /* In case of RARP (message size is 60) notify backup to send a fake RARP. |
119 | This fake RARP will be sent by backend only for guest | |
120 | without GUEST_ANNOUNCE capability. | |
f6f56291 | 121 | */ |
3e866365 TC |
122 | if (size == 60) { |
123 | VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); | |
124 | int r; | |
125 | static int display_rarp_failure = 1; | |
126 | char mac_addr[6]; | |
127 | ||
128 | /* extract guest mac address from the RARP message */ | |
129 | memcpy(mac_addr, &buf[6], 6); | |
130 | ||
131 | r = vhost_net_notify_migration_done(s->vhost_net, mac_addr); | |
132 | ||
133 | if ((r != 0) && (display_rarp_failure)) { | |
134 | fprintf(stderr, | |
135 | "Vhost user backend fails to broadcast fake RARP\n"); | |
136 | fflush(stderr); | |
137 | display_rarp_failure = 0; | |
138 | } | |
139 | } | |
140 | ||
f6f56291 TC |
141 | return size; |
142 | } | |
143 | ||
d314f586 NN |
144 | static void vhost_user_cleanup(NetClientState *nc) |
145 | { | |
146 | VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); | |
147 | ||
b931bfbf CO |
148 | if (s->vhost_net) { |
149 | vhost_net_cleanup(s->vhost_net); | |
e6bcb1b6 | 150 | g_free(s->vhost_net); |
b931bfbf CO |
151 | s->vhost_net = NULL; |
152 | } | |
32a6ebec | 153 | if (s->chr.chr) { |
5345fdb4 | 154 | qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL, NULL); |
32a6ebec MAL |
155 | qemu_chr_fe_release(s->chr.chr); |
156 | s->chr.chr = NULL; | |
25f0d2aa | 157 | } |
b931bfbf | 158 | |
d314f586 NN |
159 | qemu_purge_queued_packets(nc); |
160 | } | |
161 | ||
162 | static bool vhost_user_has_vnet_hdr(NetClientState *nc) | |
163 | { | |
f394b2e2 | 164 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
d314f586 NN |
165 | |
166 | return true; | |
167 | } | |
168 | ||
169 | static bool vhost_user_has_ufo(NetClientState *nc) | |
170 | { | |
f394b2e2 | 171 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER); |
d314f586 NN |
172 | |
173 | return true; | |
174 | } | |
175 | ||
176 | static NetClientInfo net_vhost_user_info = { | |
f394b2e2 | 177 | .type = NET_CLIENT_DRIVER_VHOST_USER, |
d314f586 | 178 | .size = sizeof(VhostUserState), |
f6f56291 | 179 | .receive = vhost_user_receive, |
d314f586 NN |
180 | .cleanup = vhost_user_cleanup, |
181 | .has_vnet_hdr = vhost_user_has_vnet_hdr, | |
182 | .has_ufo = vhost_user_has_ufo, | |
183 | }; | |
184 | ||
a6553598 TM |
185 | static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond, |
186 | void *opaque) | |
187 | { | |
188 | VhostUserState *s = opaque; | |
a6553598 | 189 | |
5345fdb4 | 190 | qemu_chr_fe_disconnect(&s->chr); |
a6553598 TM |
191 | |
192 | return FALSE; | |
193 | } | |
194 | ||
d314f586 NN |
195 | static void net_vhost_user_event(void *opaque, int event) |
196 | { | |
b931bfbf CO |
197 | const char *name = opaque; |
198 | NetClientState *ncs[MAX_QUEUE_NUM]; | |
199 | VhostUserState *s; | |
5345fdb4 | 200 | CharDriverState *chr; |
b931bfbf CO |
201 | Error *err = NULL; |
202 | int queues; | |
d314f586 | 203 | |
b931bfbf | 204 | queues = qemu_find_net_clients_except(name, ncs, |
f394b2e2 | 205 | NET_CLIENT_DRIVER_NIC, |
b931bfbf | 206 | MAX_QUEUE_NUM); |
c1bf3531 MAL |
207 | assert(queues < MAX_QUEUE_NUM); |
208 | ||
b931bfbf | 209 | s = DO_UPCAST(VhostUserState, nc, ncs[0]); |
5345fdb4 MAL |
210 | chr = qemu_chr_fe_get_driver(&s->chr); |
211 | trace_vhost_user_event(chr->label, event); | |
d314f586 NN |
212 | switch (event) { |
213 | case CHR_EVENT_OPENED: | |
5345fdb4 | 214 | s->watch = qemu_chr_fe_add_watch(&s->chr, G_IO_HUP, |
a6553598 | 215 | net_vhost_user_watch, s); |
b931bfbf | 216 | if (vhost_user_start(queues, ncs) < 0) { |
5345fdb4 | 217 | qemu_chr_fe_disconnect(&s->chr); |
0d572afd | 218 | return; |
b931bfbf CO |
219 | } |
220 | qmp_set_link(name, true, &err); | |
c89804d6 | 221 | s->started = true; |
d314f586 NN |
222 | break; |
223 | case CHR_EVENT_CLOSED: | |
d39c87d7 | 224 | qmp_set_link(name, false, &err); |
b931bfbf | 225 | vhost_user_stop(queues, ncs); |
a6553598 TM |
226 | g_source_remove(s->watch); |
227 | s->watch = 0; | |
d314f586 NN |
228 | break; |
229 | } | |
b931bfbf CO |
230 | |
231 | if (err) { | |
232 | error_report_err(err); | |
233 | } | |
d314f586 NN |
234 | } |
235 | ||
236 | static int net_vhost_user_init(NetClientState *peer, const char *device, | |
b931bfbf CO |
237 | const char *name, CharDriverState *chr, |
238 | int queues) | |
d314f586 | 239 | { |
32a6ebec | 240 | Error *err = NULL; |
c89804d6 | 241 | NetClientState *nc, *nc0 = NULL; |
d314f586 | 242 | VhostUserState *s; |
b931bfbf | 243 | int i; |
d314f586 | 244 | |
c1bf3531 MAL |
245 | assert(name); |
246 | assert(queues > 0); | |
247 | ||
b931bfbf CO |
248 | for (i = 0; i < queues; i++) { |
249 | nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name); | |
c89804d6 MAL |
250 | if (!nc0) { |
251 | nc0 = nc; | |
252 | } | |
d314f586 | 253 | |
b931bfbf CO |
254 | snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s", |
255 | i, chr->label); | |
d314f586 | 256 | |
b931bfbf | 257 | nc->queue_index = i; |
d314f586 | 258 | |
b931bfbf | 259 | s = DO_UPCAST(VhostUserState, nc, nc); |
5345fdb4 | 260 | |
32a6ebec MAL |
261 | if (!qemu_chr_fe_init(&s->chr, chr, &err)) { |
262 | error_report_err(err); | |
263 | return -1; | |
264 | } | |
b931bfbf | 265 | } |
d345ed2d | 266 | |
c89804d6 MAL |
267 | s = DO_UPCAST(VhostUserState, nc, nc0); |
268 | do { | |
5345fdb4 | 269 | if (qemu_chr_fe_wait_connected(&s->chr, &err) < 0) { |
c89804d6 MAL |
270 | error_report_err(err); |
271 | return -1; | |
272 | } | |
5345fdb4 MAL |
273 | qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, |
274 | net_vhost_user_event, nc0->name, NULL); | |
c89804d6 | 275 | } while (!s->started); |
d314f586 | 276 | |
1a5b68ce MAL |
277 | assert(s->vhost_net); |
278 | ||
d314f586 NN |
279 | return 0; |
280 | } | |
281 | ||
0a73336d | 282 | static CharDriverState *net_vhost_claim_chardev( |
81904831 | 283 | const NetdevVhostUserOptions *opts, Error **errp) |
03ce5744 NN |
284 | { |
285 | CharDriverState *chr = qemu_chr_find(opts->chardev); | |
03ce5744 NN |
286 | |
287 | if (chr == NULL) { | |
81904831 | 288 | error_setg(errp, "chardev \"%s\" not found", opts->chardev); |
03ce5744 NN |
289 | return NULL; |
290 | } | |
291 | ||
0a73336d DB |
292 | if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) { |
293 | error_setg(errp, "chardev \"%s\" is not reconnectable", | |
294 | opts->chardev); | |
03ce5744 NN |
295 | return NULL; |
296 | } | |
0a73336d DB |
297 | if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_FD_PASS)) { |
298 | error_setg(errp, "chardev \"%s\" does not support FD passing", | |
81904831 | 299 | opts->chardev); |
03ce5744 NN |
300 | return NULL; |
301 | } | |
302 | ||
303 | qemu_chr_fe_claim_no_fail(chr); | |
304 | ||
305 | return chr; | |
306 | } | |
307 | ||
28d0de7a | 308 | static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp) |
03ce5744 NN |
309 | { |
310 | const char *name = opaque; | |
311 | const char *driver, *netdev; | |
03ce5744 NN |
312 | |
313 | driver = qemu_opt_get(opts, "driver"); | |
314 | netdev = qemu_opt_get(opts, "netdev"); | |
315 | ||
316 | if (!driver || !netdev) { | |
317 | return 0; | |
318 | } | |
319 | ||
320 | if (strcmp(netdev, name) == 0 && | |
d9d26114 | 321 | !g_str_has_prefix(driver, "virtio-net-")) { |
81904831 | 322 | error_setg(errp, "vhost-user requires frontend driver virtio-net-*"); |
03ce5744 NN |
323 | return -1; |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
cebea510 | 329 | int net_init_vhost_user(const Netdev *netdev, const char *name, |
a30ecde6 | 330 | NetClientState *peer, Error **errp) |
d314f586 | 331 | { |
b931bfbf | 332 | int queues; |
03ce5744 NN |
333 | const NetdevVhostUserOptions *vhost_user_opts; |
334 | CharDriverState *chr; | |
03ce5744 | 335 | |
f394b2e2 EB |
336 | assert(netdev->type == NET_CLIENT_DRIVER_VHOST_USER); |
337 | vhost_user_opts = &netdev->u.vhost_user; | |
03ce5744 | 338 | |
0a73336d | 339 | chr = net_vhost_claim_chardev(vhost_user_opts, errp); |
03ce5744 | 340 | if (!chr) { |
03ce5744 NN |
341 | return -1; |
342 | } | |
343 | ||
344 | /* verify net frontend */ | |
345 | if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net, | |
81904831 | 346 | (char *)name, errp)) { |
03ce5744 NN |
347 | return -1; |
348 | } | |
349 | ||
b931bfbf | 350 | queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1; |
fff4e48e | 351 | if (queues < 1 || queues > MAX_QUEUE_NUM) { |
6f6f9512 | 352 | error_setg(errp, |
fff4e48e IM |
353 | "vhost-user number of queues must be in range [1, %d]", |
354 | MAX_QUEUE_NUM); | |
6f6f9512 VK |
355 | return -1; |
356 | } | |
03ce5744 | 357 | |
b931bfbf | 358 | return net_vhost_user_init(peer, "vhost_user", name, chr, queues); |
d314f586 | 359 | } |