diff options
Diffstat (limited to 'net/vhost-user.c')
| -rw-r--r-- | net/vhost-user.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/net/vhost-user.c b/net/vhost-user.c new file mode 100644 index 00000000..93dcecd6 --- /dev/null +++ b/net/vhost-user.c @@ -0,0 +1,248 @@ +/* + * 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" + +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 int vhost_user_start(VhostUserState *s) +{ + VhostNetOptions options; + + if (vhost_user_running(s)) { + return 0; + } + + options.backend_type = VHOST_BACKEND_TYPE_USER; + options.net_backend = &s->nc; + options.opaque = s->chr; + + s->vhost_net = vhost_net_init(&options); + + return vhost_user_running(s) ? 0 : -1; +} + +static void vhost_user_stop(VhostUserState *s) +{ + if (vhost_user_running(s)) { + vhost_net_cleanup(s->vhost_net); + } + + s->vhost_net = 0; +} + +static void vhost_user_cleanup(NetClientState *nc) +{ + VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc); + + vhost_user_stop(s); + 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), + .cleanup = vhost_user_cleanup, + .has_vnet_hdr = vhost_user_has_vnet_hdr, + .has_ufo = vhost_user_has_ufo, +}; + +static void net_vhost_link_down(VhostUserState *s, bool link_down) +{ + s->nc.link_down = link_down; + + if (s->nc.peer) { + s->nc.peer->link_down = link_down; + } + + if (s->nc.info->link_status_changed) { + s->nc.info->link_status_changed(&s->nc); + } + + if (s->nc.peer && s->nc.peer->info->link_status_changed) { + s->nc.peer->info->link_status_changed(s->nc.peer); + } +} + +static void net_vhost_user_event(void *opaque, int event) +{ + VhostUserState *s = opaque; + + switch (event) { + case CHR_EVENT_OPENED: + vhost_user_start(s); + net_vhost_link_down(s, false); + error_report("chardev \"%s\" went up", s->chr->label); + break; + case CHR_EVENT_CLOSED: + net_vhost_link_down(s, true); + vhost_user_stop(s); + error_report("chardev \"%s\" went down", s->chr->label); + break; + } +} + +static int net_vhost_user_init(NetClientState *peer, const char *device, + const char *name, CharDriverState *chr) +{ + NetClientState *nc; + VhostUserState *s; + + nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name); + + snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user to %s", + chr->label); + + s = DO_UPCAST(VhostUserState, nc, nc); + + /* We don't provide a receive callback */ + s->nc.receive_disabled = 1; + s->chr = chr; + + qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s); + + 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) +{ + const NetdevVhostUserOptions *vhost_user_opts; + CharDriverState *chr; + + assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VHOST_USER); + vhost_user_opts = opts->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; + } + + + return net_vhost_user_init(peer, "vhost_user", name, chr); +} |