| /* |
| * vhost-user.c |
| * |
| * Copyright (c) 2013 Virtual Open Systems Sarl. |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "clients.h" |
| #include "net/vhost_net.h" |
| #include "net/vhost-user.h" |
| #include "sysemu/char.h" |
| #include "qemu/config-file.h" |
| #include "qemu/error-report.h" |
| #include "qmp-commands.h" |
| #include "trace.h" |
| |
| typedef struct VhostUserState { |
| NetClientState nc; |
| CharDriverState *chr; |
| VHostNetState *vhost_net; |
| guint watch; |
| uint64_t acked_features; |
| } VhostUserState; |
| |
| typedef struct VhostUserChardevProps { |
| bool is_socket; |
| bool is_unix; |
| } VhostUserChardevProps; |
| |
| VHostNetState *vhost_user_get_vhost_net(NetClientState *nc) |
| { |
| VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); |
| assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| return s->vhost_net; |
| } |
| |
| uint64_t vhost_user_get_acked_features(NetClientState *nc) |
| { |
| VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); |
| assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| return s->acked_features; |
| } |
| |
| static int vhost_user_running(VhostUserState *s) |
| { |
| return (s->vhost_net) ? 1 : 0; |
| } |
| |
| static void vhost_user_stop(int queues, NetClientState *ncs[]) |
| { |
| VhostUserState *s; |
| int i; |
| |
| for (i = 0; i < queues; i++) { |
| assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| |
| s = DO_UPCAST(VhostUserState, nc, ncs[i]); |
| if (!vhost_user_running(s)) { |
| continue; |
| } |
| |
| if (s->vhost_net) { |
| /* save acked features */ |
| s->acked_features = vhost_net_get_acked_features(s->vhost_net); |
| vhost_net_cleanup(s->vhost_net); |
| s->vhost_net = NULL; |
| } |
| } |
| } |
| |
| static int vhost_user_start(int queues, NetClientState *ncs[]) |
| { |
| VhostNetOptions options; |
| VhostUserState *s; |
| int max_queues; |
| int i; |
| |
| options.backend_type = VHOST_BACKEND_TYPE_USER; |
| |
| for (i = 0; i < queues; i++) { |
| assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| |
| s = DO_UPCAST(VhostUserState, nc, ncs[i]); |
| if (vhost_user_running(s)) { |
| continue; |
| } |
| |
| options.net_backend = ncs[i]; |
| options.opaque = s->chr; |
| s->vhost_net = vhost_net_init(&options); |
| if (!s->vhost_net) { |
| error_report("failed to init vhost_net for queue %d", i); |
| goto err; |
| } |
| |
| if (i == 0) { |
| max_queues = vhost_net_get_max_queues(s->vhost_net); |
| if (queues > max_queues) { |
| error_report("you are asking more queues than supported: %d", |
| max_queues); |
| goto err; |
| } |
| } |
| } |
| |
| return 0; |
| |
| err: |
| vhost_user_stop(i + 1, ncs); |
| return -1; |
| } |
| |
| static ssize_t vhost_user_receive(NetClientState *nc, const uint8_t *buf, |
| size_t size) |
| { |
| /* In case of RARP (message size is 60) notify backup to send a fake RARP. |
| This fake RARP will be sent by backend only for guest |
| without GUEST_ANNOUNCE capability. |
| */ |
| if (size == 60) { |
| VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); |
| int r; |
| static int display_rarp_failure = 1; |
| char mac_addr[6]; |
| |
| /* extract guest mac address from the RARP message */ |
| memcpy(mac_addr, &buf[6], 6); |
| |
| r = vhost_net_notify_migration_done(s->vhost_net, mac_addr); |
| |
| if ((r != 0) && (display_rarp_failure)) { |
| fprintf(stderr, |
| "Vhost user backend fails to broadcast fake RARP\n"); |
| fflush(stderr); |
| display_rarp_failure = 0; |
| } |
| } |
| |
| return size; |
| } |
| |
| static void vhost_user_cleanup(NetClientState *nc) |
| { |
| VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); |
| |
| if (s->vhost_net) { |
| vhost_net_cleanup(s->vhost_net); |
| s->vhost_net = NULL; |
| } |
| if (s->chr) { |
| qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL); |
| qemu_chr_fe_release(s->chr); |
| s->chr = NULL; |
| } |
| |
| qemu_purge_queued_packets(nc); |
| } |
| |
| static bool vhost_user_has_vnet_hdr(NetClientState *nc) |
| { |
| assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| |
| return true; |
| } |
| |
| static bool vhost_user_has_ufo(NetClientState *nc) |
| { |
| assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| |
| return true; |
| } |
| |
| static NetClientInfo net_vhost_user_info = { |
| .type = NET_CLIENT_OPTIONS_KIND_VHOST_USER, |
| .size = sizeof(VhostUserState), |
| .receive = vhost_user_receive, |
| .cleanup = vhost_user_cleanup, |
| .has_vnet_hdr = vhost_user_has_vnet_hdr, |
| .has_ufo = vhost_user_has_ufo, |
| }; |
| |
| static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond, |
| void *opaque) |
| { |
| VhostUserState *s = opaque; |
| uint8_t buf[1]; |
| |
| /* We don't actually want to read anything, but CHR_EVENT_CLOSED will be |
| * raised as a side-effect of the read. |
| */ |
| qemu_chr_fe_read_all(s->chr, buf, sizeof(buf)); |
| |
| return FALSE; |
| } |
| |
| static void net_vhost_user_event(void *opaque, int event) |
| { |
| const char *name = opaque; |
| NetClientState *ncs[MAX_QUEUE_NUM]; |
| VhostUserState *s; |
| Error *err = NULL; |
| int queues; |
| |
| queues = qemu_find_net_clients_except(name, ncs, |
| NET_CLIENT_OPTIONS_KIND_NIC, |
| MAX_QUEUE_NUM); |
| assert(queues < MAX_QUEUE_NUM); |
| |
| s = DO_UPCAST(VhostUserState, nc, ncs[0]); |
| trace_vhost_user_event(s->chr->label, event); |
| switch (event) { |
| case CHR_EVENT_OPENED: |
| s->watch = qemu_chr_fe_add_watch(s->chr, G_IO_HUP, |
| net_vhost_user_watch, s); |
| if (vhost_user_start(queues, ncs) < 0) { |
| qemu_chr_disconnect(s->chr); |
| return; |
| } |
| qmp_set_link(name, true, &err); |
| break; |
| case CHR_EVENT_CLOSED: |
| qmp_set_link(name, false, &err); |
| vhost_user_stop(queues, ncs); |
| g_source_remove(s->watch); |
| s->watch = 0; |
| break; |
| } |
| |
| if (err) { |
| error_report_err(err); |
| } |
| } |
| |
| static int net_vhost_user_init(NetClientState *peer, const char *device, |
| const char *name, CharDriverState *chr, |
| int queues) |
| { |
| NetClientState *nc; |
| VhostUserState *s; |
| int i; |
| |
| assert(name); |
| assert(queues > 0); |
| |
| for (i = 0; i < queues; i++) { |
| nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name); |
| |
| snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user%d to %s", |
| i, chr->label); |
| |
| nc->queue_index = i; |
| |
| s = DO_UPCAST(VhostUserState, nc, nc); |
| s->chr = chr; |
| } |
| |
| qemu_chr_add_handlers(chr, NULL, NULL, net_vhost_user_event, nc[0].name); |
| |
| return 0; |
| } |
| |
| static int net_vhost_chardev_opts(void *opaque, |
| const char *name, const char *value, |
| Error **errp) |
| { |
| VhostUserChardevProps *props = opaque; |
| |
| if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) { |
| props->is_socket = true; |
| } else if (strcmp(name, "path") == 0) { |
| props->is_unix = true; |
| } else if (strcmp(name, "server") == 0) { |
| } else { |
| error_setg(errp, |
| "vhost-user does not support a chardev with option %s=%s", |
| name, value); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static CharDriverState *net_vhost_parse_chardev( |
| const NetdevVhostUserOptions *opts, Error **errp) |
| { |
| CharDriverState *chr = qemu_chr_find(opts->chardev); |
| VhostUserChardevProps props; |
| |
| if (chr == NULL) { |
| error_setg(errp, "chardev \"%s\" not found", opts->chardev); |
| return NULL; |
| } |
| |
| /* inspect chardev opts */ |
| memset(&props, 0, sizeof(props)); |
| if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, errp)) { |
| return NULL; |
| } |
| |
| if (!props.is_socket || !props.is_unix) { |
| error_setg(errp, "chardev \"%s\" is not a unix socket", |
| opts->chardev); |
| return NULL; |
| } |
| |
| qemu_chr_fe_claim_no_fail(chr); |
| |
| return chr; |
| } |
| |
| static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp) |
| { |
| const char *name = opaque; |
| const char *driver, *netdev; |
| const char virtio_name[] = "virtio-net-"; |
| |
| driver = qemu_opt_get(opts, "driver"); |
| netdev = qemu_opt_get(opts, "netdev"); |
| |
| if (!driver || !netdev) { |
| return 0; |
| } |
| |
| if (strcmp(netdev, name) == 0 && |
| strncmp(driver, virtio_name, strlen(virtio_name)) != 0) { |
| error_setg(errp, "vhost-user requires frontend driver virtio-net-*"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int net_init_vhost_user(const NetClientOptions *opts, const char *name, |
| NetClientState *peer, Error **errp) |
| { |
| int queues; |
| const NetdevVhostUserOptions *vhost_user_opts; |
| CharDriverState *chr; |
| |
| assert(opts->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER); |
| vhost_user_opts = opts->u.vhost_user.data; |
| |
| chr = net_vhost_parse_chardev(vhost_user_opts, errp); |
| if (!chr) { |
| return -1; |
| } |
| |
| /* verify net frontend */ |
| if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net, |
| (char *)name, errp)) { |
| return -1; |
| } |
| |
| queues = vhost_user_opts->has_queues ? vhost_user_opts->queues : 1; |
| if (queues < 1 || queues > MAX_QUEUE_NUM) { |
| error_setg(errp, |
| "vhost-user number of queues must be in range [1, %d]", |
| MAX_QUEUE_NUM); |
| return -1; |
| } |
| |
| return net_vhost_user_init(peer, "vhost_user", name, chr, queues); |
| } |