--- /dev/null
+/*
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff