palmetto-bmc: Configure the SCU's hardware strapping register
[qemu/ar7.git] / net / vhost-user.c
blobd72ce9b490f22b0c42863bd0fb58b505e93edb64
1 /*
2 * vhost-user.c
4 * Copyright (c) 2013 Virtual Open Systems Sarl.
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.
9 */
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"
21 typedef struct VhostUserState {
22 NetClientState nc;
23 CharDriverState *chr;
24 VHostNetState *vhost_net;
25 int watch;
26 uint64_t acked_features;
27 } VhostUserState;
29 typedef struct VhostUserChardevProps {
30 bool is_socket;
31 bool is_unix;
32 } VhostUserChardevProps;
34 VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
36 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
37 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
38 return s->vhost_net;
41 uint64_t vhost_user_get_acked_features(NetClientState *nc)
43 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
44 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
45 return s->acked_features;
48 static int vhost_user_running(VhostUserState *s)
50 return (s->vhost_net) ? 1 : 0;
53 static void vhost_user_stop(int queues, NetClientState *ncs[])
55 VhostUserState *s;
56 int i;
58 for (i = 0; i < queues; i++) {
59 assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
61 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
62 if (!vhost_user_running(s)) {
63 continue;
66 if (s->vhost_net) {
67 /* save acked features */
68 s->acked_features = vhost_net_get_acked_features(s->vhost_net);
69 vhost_net_cleanup(s->vhost_net);
70 s->vhost_net = NULL;
75 static int vhost_user_start(int queues, NetClientState *ncs[])
77 VhostNetOptions options;
78 VhostUserState *s;
79 int max_queues;
80 int i;
82 options.backend_type = VHOST_BACKEND_TYPE_USER;
84 for (i = 0; i < queues; i++) {
85 assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
87 s = DO_UPCAST(VhostUserState, nc, ncs[i]);
88 if (vhost_user_running(s)) {
89 continue;
92 options.net_backend = ncs[i];
93 options.opaque = s->chr;
94 s->vhost_net = vhost_net_init(&options);
95 if (!s->vhost_net) {
96 error_report("failed to init vhost_net for queue %d", i);
97 goto err;
100 if (i == 0) {
101 max_queues = vhost_net_get_max_queues(s->vhost_net);
102 if (queues > max_queues) {
103 error_report("you are asking more queues than supported: %d",
104 max_queues);
105 goto err;
110 return 0;
112 err:
113 vhost_user_stop(i + 1, ncs);
114 return -1;
117 static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf,
118 size_t size)
120 /* In case of RARP (message size is 60) notify backup to send a fake RARP.
121 This fake RARP will be sent by backend only for guest
122 without GUEST_ANNOUNCE capability.
124 if (size == 60) {
125 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
126 int r;
127 static int display_rarp_failure = 1;
128 char mac_addr[6];
130 /* extract guest mac address from the RARP message */
131 memcpy(mac_addr, &buf[6], 6);
133 r = vhost_net_notify_migration_done(s->vhost_net, mac_addr);
135 if ((r != 0) && (display_rarp_failure)) {
136 fprintf(stderr,
137 "Vhost user backend fails to broadcast fake RARP\n");
138 fflush(stderr);
139 display_rarp_failure = 0;
143 return size;
146 static void vhost_user_cleanup(NetClientState *nc)
148 VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
150 if (s->vhost_net) {
151 vhost_net_cleanup(s->vhost_net);
152 s->vhost_net = NULL;
155 qemu_purge_queued_packets(nc);
158 static bool vhost_user_has_vnet_hdr(NetClientState *nc)
160 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
162 return true;
165 static bool vhost_user_has_ufo(NetClientState *nc)
167 assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
169 return true;
172 static NetClientInfo net_vhost_user_info = {
173 .type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
174 .size = sizeof(VhostUserState),
175 .receive = vhost_user_receive,
176 .cleanup = vhost_user_cleanup,
177 .has_vnet_hdr = vhost_user_has_vnet_hdr,
178 .has_ufo = vhost_user_has_ufo,
181 static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond,
182 void *opaque)
184 VhostUserState *s = opaque;
185 uint8_t buf[1];
187 /* We don't actually want to read anything, but CHR_EVENT_CLOSED will be
188 * raised as a side-effect of the read.
190 qemu_chr_fe_read_all(s->chr, buf, sizeof(buf));
192 return FALSE;
195 static void net_vhost_user_event(void *opaque, int event)
197 const char *name = opaque;
198 NetClientState *ncs[MAX_QUEUE_NUM];
199 VhostUserState *s;
200 Error *err = NULL;
201 int queues;
203 queues = qemu_find_net_clients_except(name, ncs,
204 NET_CLIENT_OPTIONS_KIND_NIC,
205 MAX_QUEUE_NUM);
206 assert(queues < MAX_QUEUE_NUM);
208 s = DO_UPCAST(VhostUserState, nc, ncs[0]);
209 trace_vhost_user_event(s->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) < 0) {
215 qemu_chr_disconnect(s->chr);
216 return;
218 qmp_set_link(name, true, &err);
219 break;
220 case CHR_EVENT_CLOSED:
221 qmp_set_link(name, false, &err);
222 vhost_user_stop(queues, ncs);
223 g_source_remove(s->watch);
224 s->watch = 0;
225 break;
228 if (err) {
229 error_report_err(err);
233 static int net_vhost_user_init(NetClientState *peer, const char *device,
234 const char *name, CharDriverState *chr,
235 int queues)
237 NetClientState *nc;
238 VhostUserState *s;
239 int i;
241 assert(name);
242 assert(queues > 0);
244 for (i = 0; i < queues; i++) {
245 nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
247 snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s",
248 i, chr->label);
250 nc->queue_index = i;
252 s = DO_UPCAST(VhostUserState, nc, nc);
253 s->chr = chr;
256 qemu_chr_add_handlers(chr, NULL, NULL, net_vhost_user_event, nc[0].name);
258 return 0;
261 static int net_vhost_chardev_opts(void *opaque,
262 const char *name, const char *value,
263 Error **errp)
265 VhostUserChardevProps *props = opaque;
267 if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) {
268 props->is_socket = true;
269 } else if (strcmp(name, "path") == 0) {
270 props->is_unix = true;
271 } else if (strcmp(name, "server") == 0) {
272 } else {
273 error_setg(errp,
274 "vhost-user does not support a chardev with option %s=%s",
275 name, value);
276 return -1;
278 return 0;
281 static CharDriverState *net_vhost_parse_chardev(
282 const NetdevVhostUserOptions *opts, Error **errp)
284 CharDriverState *chr = qemu_chr_find(opts->chardev);
285 VhostUserChardevProps props;
287 if (chr == NULL) {
288 error_setg(errp, "chardev \"%s\" not found", opts->chardev);
289 return NULL;
292 /* inspect chardev opts */
293 memset(&props, 0, sizeof(props));
294 if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, errp)) {
295 return NULL;
298 if (!props.is_socket || !props.is_unix) {
299 error_setg(errp, "chardev \"%s\" is not a unix socket",
300 opts->chardev);
301 return NULL;
304 qemu_chr_fe_claim_no_fail(chr);
306 return chr;
309 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
311 const char *name = opaque;
312 const char *driver, *netdev;
313 const char virtio_name[] = "virtio-net-";
315 driver = qemu_opt_get(opts, "driver");
316 netdev = qemu_opt_get(opts, "netdev");
318 if (!driver || !netdev) {
319 return 0;
322 if (strcmp(netdev, name) == 0 &&
323 strncmp(driver, virtio_name, strlen(virtio_name)) != 0) {
324 error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
325 return -1;
328 return 0;
331 int net_init_vhost_user(const NetClientOptions *opts, const char *name,
332 NetClientState *peer, Error **errp)
334 int queues;
335 const NetdevVhostUserOptions *vhost_user_opts;
336 CharDriverState *chr;
338 assert(opts->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
339 vhost_user_opts = opts->u.vhost_user.data;
341 chr = net_vhost_parse_chardev(vhost_user_opts, errp);
342 if (!chr) {
343 return -1;
346 /* verify net frontend */
347 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
348 (char *)name, errp)) {
349 return -1;
352 queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1;
353 if (queues < 1 || queues > MAX_QUEUE_NUM) {
354 error_setg(errp,
355 "vhost-user number of queues must be in range [1, %d]",
356 MAX_QUEUE_NUM);
357 return -1;
360 return net_vhost_user_init(peer, "vhost_user", name, chr, queues);