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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 "sysemu/char.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 qemu_chr_fe_deinit(&s->chr);
155 }
156
157 qemu_purge_queued_packets(nc);
158}
159
160static bool vhost_user_has_vnet_hdr(NetClientState *nc)
161{
162 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
163
164 return true;
165}
166
167static bool vhost_user_has_ufo(NetClientState *nc)
168{
169 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_USER);
170
171 return true;
172}
173
174static NetClientInfo net_vhost_user_info = {
175 .type = NET_CLIENT_DRIVER_VHOST_USER,
176 .size = sizeof(VhostUserState),
177 .receive = vhost_user_receive,
178 .cleanup = vhost_user_cleanup,
179 .has_vnet_hdr = vhost_user_has_vnet_hdr,
180 .has_ufo = vhost_user_has_ufo,
181};
182
183static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond,
184 void *opaque)
185{
186 VhostUserState *s = opaque;
187
188 qemu_chr_fe_disconnect(&s->chr);
189
190 return FALSE;
191}
192
193static void net_vhost_user_event(void *opaque, int event)
194{
195 const char *name = opaque;
196 NetClientState *ncs[MAX_QUEUE_NUM];
197 VhostUserState *s;
198 CharDriverState *chr;
199 Error *err = NULL;
200 int queues;
201
202 queues = qemu_find_net_clients_except(name, ncs,
203 NET_CLIENT_DRIVER_NIC,
204 MAX_QUEUE_NUM);
205 assert(queues < MAX_QUEUE_NUM);
206
207 s = DO_UPCAST(VhostUserState, nc, ncs[0]);
208 chr = qemu_chr_fe_get_driver(&s->chr);
209 trace_vhost_user_event(chr->label, event);
210 switch (event) {
211 case CHR_EVENT_OPENED:
212 s->watch = qemu_chr_fe_add_watch(&s->chr, G_IO_HUP,
213 net_vhost_user_watch, s);
214 if (vhost_user_start(queues, ncs, &s->chr) < 0) {
215 qemu_chr_fe_disconnect(&s->chr);
216 return;
217 }
218 qmp_set_link(name, true, &err);
219 s->started = true;
220 break;
221 case CHR_EVENT_CLOSED:
222 qmp_set_link(name, false, &err);
223 vhost_user_stop(queues, ncs);
224 g_source_remove(s->watch);
225 s->watch = 0;
226 break;
227 }
228
229 if (err) {
230 error_report_err(err);
231 }
232}
233
234static int net_vhost_user_init(NetClientState *peer, const char *device,
235 const char *name, CharDriverState *chr,
236 int queues)
237{
238 Error *err = NULL;
239 NetClientState *nc, *nc0 = NULL;
240 VhostUserState *s;
241 int i;
242
243 assert(name);
244 assert(queues > 0);
245
246 for (i = 0; i < queues; i++) {
247 nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
248 snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
249 i, chr->label);
250 nc->queue_index = i;
251 if (!nc0) {
252 nc0 = nc;
253 s = DO_UPCAST(VhostUserState, nc, nc);
254 if (!qemu_chr_fe_init(&s->chr, chr, &err)) {
255 error_report_err(err);
256 return -1;
257 }
258 }
259
260 }
261
262 s = DO_UPCAST(VhostUserState, nc, nc0);
263 do {
264 if (qemu_chr_fe_wait_connected(&s->chr, &err) < 0) {
265 error_report_err(err);
266 return -1;
267 }
268 qemu_chr_fe_set_handlers(&s->chr, NULL, NULL,
269 net_vhost_user_event, nc0->name, NULL, true);
270 } while (!s->started);
271
272 assert(s->vhost_net);
273
274 return 0;
275}
276
277static CharDriverState *net_vhost_claim_chardev(
278 const NetdevVhostUserOptions *opts, Error **errp)
279{
280 CharDriverState *chr = qemu_chr_find(opts->chardev);
281
282 if (chr == NULL) {
283 error_setg(errp, "chardev \"%s\" not found", opts->chardev);
284 return NULL;
285 }
286
287 if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE)) {
288 error_setg(errp, "chardev \"%s\" is not reconnectable",
289 opts->chardev);
290 return NULL;
291 }
292 if (!qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_FD_PASS)) {
293 error_setg(errp, "chardev \"%s\" does not support FD passing",
294 opts->chardev);
295 return NULL;
296 }
297
298 return chr;
299}
300
301static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
302{
303 const char *name = opaque;
304 const char *driver, *netdev;
305
306 driver = qemu_opt_get(opts, "driver");
307 netdev = qemu_opt_get(opts, "netdev");
308
309 if (!driver || !netdev) {
310 return 0;
311 }
312
313 if (strcmp(netdev, name) == 0 &&
314 !g_str_has_prefix(driver, "virtio-net-")) {
315 error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
316 return -1;
317 }
318
319 return 0;
320}
321
322int net_init_vhost_user(const Netdev *netdev, const char *name,
323 NetClientState *peer, Error **errp)
324{
325 int queues;
326 const NetdevVhostUserOptions *vhost_user_opts;
327 CharDriverState *chr;
328
329 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_USER);
330 vhost_user_opts = &netdev->u.vhost_user;
331
332 chr = net_vhost_claim_chardev(vhost_user_opts, errp);
333 if (!chr) {
334 return -1;
335 }
336
337
338 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
339 (char *)name, errp)) {
340 return -1;
341 }
342
343 queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
344 if (queues < 1 || queues > MAX_QUEUE_NUM) {
345 error_setg(errp,
346 "vhost-user number of queues must be in range [1, %d]",
347 MAX_QUEUE_NUM);
348 return -1;
349 }
350
351 return net_vhost_user_init(peer, "vhost_user", name, chr, queues);
352}
353
