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11#include "qemu/osdep.h"
12#include "clients.h"
13#include "net/vhost_net.h"
14#include "net/vhost-user.h"
15#include "chardev/char-fe.h"
16#include "qemu/config-file.h"
17#include "qemu/error-report.h"
18#include "qmp-commands.h"
19#include "trace.h"
20
21typedef struct VhostUserState {
22 NetClientState nc;
23 CharBackend chr;
24 VHostNetState *vhost_net;
25 guint watch;
26 uint64_t acked_features;
27 bool started;
28} VhostUserState;
29
30VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
31{
32 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
33 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
34 return s->vhost_net;
35}
36
37uint64_t vhost_user_get_acked_features(NetClientState *nc)
38{
39 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
40 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
41 return s->acked_features;
42}
43
44static void vhost_user_stop(int queues, NetClientState *ncs[])
45{
46 VhostUserState *s;
47 int i;
48
49 for (i = 0; i < queues; i++) {
50 assert(ncs[i]->info->type == NET_CLIENT_DRIVER_VHOST_USER);
51
52 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
53
54 if (s->vhost_net) {
55
56 uint64_t features = vhost_net_get_acked_features(s->vhost_net);
57 if (features) {
58 s->acked_features = features;
59 }
60 vhost_net_cleanup(s->vhost_net);
61 }
62 }
63}
64
65static int vhost_user_start(int queues, NetClientState *ncs[], CharBackend *be)
66{
67 VhostNetOptions options;
68 struct vhost_net *net = NULL;
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++) {
76 assert(ncs[i]->info->type == NET_CLIENT_DRIVER_VHOST_USER);
77
78 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
79
80 options.net_backend = ncs[i];
81 options.opaque = be;
82 options.busyloop_timeout = 0;
83 net = vhost_net_init(&options);
84 if (!net) {
85 error_report("failed to init vhost_net for queue %d", i);
86 goto err;
87 }
88
89 if (i == 0) {
90 max_queues = vhost_net_get_max_queues(net);
91 if (queues > max_queues) {
92 error_report("you are asking more queues than supported: %d",
93 max_queues);
94 goto err;
95 }
96 }
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;
103 }
104
105 return 0;
106
107err:
108 if (net) {
109 vhost_net_cleanup(net);
110 }
111 vhost_user_stop(i, ncs);
112 return -1;
113}
114
115static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf,
116 size_t size)
117{
118
119
120
121
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
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
141 return size;
142}
143
144static void vhost_user_cleanup(NetClientState *nc)
145{
146 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
147
148 if (s->vhost_net) {
149 vhost_net_cleanup(s->vhost_net);
150 g_free(s->vhost_net);
151 s->vhost_net = NULL;
152 }
153 if (nc->queue_index == 0) {
154 if (s->watch) {
155 g_source_remove(s->watch);
156 s->watch = 0;
157 }
158 qemu_chr_fe_deinit(&s->chr, true);
159 }
160
161 qemu_purge_queued_packets(nc);
162}
163
164static bool vhost_user_has_vnet_hdr(NetClientState *nc)
165{
166 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
167
168 return true;
169}
170
171static bool vhost_user_has_ufo(NetClientState *nc)
172{
173 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
174
175 return true;
176}
177
178static NetClientInfo net_vhost_user_info = {
179 .type = NET_CLIENT_DRIVER_VHOST_USER,
180 .size = sizeof(VhostUserState),
181 .receive = vhost_user_receive,
182 .cleanup = vhost_user_cleanup,
183 .has_vnet_hdr = vhost_user_has_vnet_hdr,
184 .has_ufo = vhost_user_has_ufo,
185};
186
187static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond,
188 void *opaque)
189{
190 VhostUserState *s = opaque;
191
192 qemu_chr_fe_disconnect(&s->chr);
193
194 return TRUE;
195}
196
197static void net_vhost_user_event(void *opaque, int event);
198
199static void chr_closed_bh(void *opaque)
200{
201 const char *name = opaque;
202 NetClientState *ncs[MAX_QUEUE_NUM];
203 VhostUserState *s;
204 Error *err = NULL;
205 int queues;
206
207 queues = qemu_find_net_clients_except(name, ncs,
208 NET_CLIENT_DRIVER_NIC,
209 MAX_QUEUE_NUM);
210 assert(queues < MAX_QUEUE_NUM);
211
212 s = DO_UPCAST(VhostUserState, nc, ncs[0]);
213
214 qmp_set_link(name, false, &err);
215 vhost_user_stop(queues, ncs);
216
217 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, net_vhost_user_event,
218 NULL, opaque, NULL, true);
219
220 if (err) {
221 error_report_err(err);
222 }
223}
224
225static void net_vhost_user_event(void *opaque, int event)
226{
227 const char *name = opaque;
228 NetClientState *ncs[MAX_QUEUE_NUM];
229 VhostUserState *s;
230 Chardev *chr;
231 Error *err = NULL;
232 int queues;
233
234 queues = qemu_find_net_clients_except(name, ncs,
235 NET_CLIENT_DRIVER_NIC,
236 MAX_QUEUE_NUM);
237 assert(queues < MAX_QUEUE_NUM);
238
239 s = DO_UPCAST(VhostUserState, nc, ncs[0]);
240 chr = qemu_chr_fe_get_driver(&s->chr);
241 trace_vhost_user_event(chr->label, event);
242 switch (event) {
243 case CHR_EVENT_OPENED:
244 if (vhost_user_start(queues, ncs, &s->chr) < 0) {
245 qemu_chr_fe_disconnect(&s->chr);
246 return;
247 }
248 s->watch = qemu_chr_fe_add_watch(&s->chr, G_IO_HUP,
249 net_vhost_user_watch, s);
250 qmp_set_link(name, true, &err);
251 s->started = true;
252 break;
253 case CHR_EVENT_CLOSED:
254
255
256
257
258
259 if (s->watch) {
260 AioContext *ctx = qemu_get_current_aio_context();
261
262 g_source_remove(s->watch);
263 s->watch = 0;
264 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL, NULL, NULL,
265 NULL, NULL, false);
266
267 aio_bh_schedule_oneshot(ctx, chr_closed_bh, opaque);
268 }
269 break;
270 }
271
272 if (err) {
273 error_report_err(err);
274 }
275}
276
277static int net_vhost_user_init(NetClientState *peer, const char *device,
278 const char *name, Chardev *chr,
279 int queues)
280{
281 Error *err = NULL;
282 NetClientState *nc, *nc0 = NULL;
283 VhostUserState *s;
284 int i;
285
286 assert(name);
287 assert(queues > 0);
288
289 for (i = 0; i < queues; i++) {
290 nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
291 snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
292 i, chr->label);
293 nc->queue_index = i;
294 if (!nc0) {
295 nc0 = nc;
296 s = DO_UPCAST(VhostUserState, nc, nc);
297 if (!qemu_chr_fe_init(&s->chr, chr, &err)) {
298 error_report_err(err);
299 return -1;
300 }
301 }
302
303 }
304
305 s = DO_UPCAST(VhostUserState, nc, nc0);
306 do {
307 if (qemu_chr_fe_wait_connected(&s->chr, &err) < 0) {
308 error_report_err(err);
309 return -1;
310 }
311 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
312 net_vhost_user_event, NULL, nc0->name, NULL,
313 true);
314 } while (!s->started);
315
316 assert(s->vhost_net);
317
318 return 0;
319}
320
321static Chardev *net_vhost_claim_chardev(
322 const NetdevVhostUserOptions *opts, Error **errp)
323{
324 Chardev *chr = qemu_chr_find(opts->chardev);
325
326 if (chr == NULL) {
327 error_setg(errp, "chardev \"%s\" not found", opts->chardev);
328 return NULL;
329 }
330
331 if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) {
332 error_setg(errp, "chardev \"%s\" is not reconnectable",
333 opts->chardev);
334 return NULL;
335 }
336 if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_FD_PASS)) {
337 error_setg(errp, "chardev \"%s\" does not support FD passing",
338 opts->chardev);
339 return NULL;
340 }
341
342 return chr;
343}
344
345static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
346{
347 const char *name = opaque;
348 const char *driver, *netdev;
349
350 driver = qemu_opt_get(opts, "driver");
351 netdev = qemu_opt_get(opts, "netdev");
352
353 if (!driver || !netdev) {
354 return 0;
355 }
356
357 if (strcmp(netdev, name) == 0 &&
358 !g_str_has_prefix(driver, "virtio-net-")) {
359 error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
360 return -1;
361 }
362
363 return 0;
364}
365
366int net_init_vhost_user(const Netdev *netdev, const char *name,
367 NetClientState *peer, Error **errp)
368{
369 int queues;
370 const NetdevVhostUserOptions *vhost_user_opts;
371 Chardev *chr;
372
373 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_USER);
374 vhost_user_opts = &netdev->u.vhost_user;
375
376 chr = net_vhost_claim_chardev(vhost_user_opts, errp);
377 if (!chr) {
378 return -1;
379 }
380
381
382 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
383 (char *)name, errp)) {
384 return -1;
385 }
386
387 queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
388 if (queues < 1 || queues > MAX_QUEUE_NUM) {
389 error_setg(errp,
390 "vhost-user number of queues must be in range [1, %d]",
391 MAX_QUEUE_NUM);
392 return -1;
393 }
394
395 return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
396}
397
