diff options
Diffstat (limited to 'src/net/vhost-user.c')
| -rw-r--r-- | src/net/vhost-user.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/src/net/vhost-user.c b/src/net/vhost-user.c new file mode 100644 index 0000000..b368a90 --- /dev/null +++ b/src/net/vhost-user.c @@ -0,0 +1,326 @@ +/* + * 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 "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; +} VhostUserState; + +typedef struct VhostUserChardevProps { + bool is_socket; + bool is_unix; + bool is_server; +} 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; +} + +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) { + 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\n", 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\n", 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; + } + + 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 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); + s = DO_UPCAST(VhostUserState, nc, ncs[0]); + trace_vhost_user_event(s->chr->label, event); + switch (event) { + case CHR_EVENT_OPENED: + if (vhost_user_start(queues, ncs) < 0) { + exit(1); + } + qmp_set_link(name, true, &err); + break; + case CHR_EVENT_CLOSED: + qmp_set_link(name, false, &err); + vhost_user_stop(queues, ncs); + 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; + + 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, (void*)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) { + props->is_server = true; + } 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; + + 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) { + error_setg(errp, + "vhost-user number of queues must be bigger than zero"); + return -1; + } + + return net_vhost_user_init(peer, "vhost_user", name, chr, queues); +} |
