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![Michael S. Tsirkin](/assets/img/avatar_default.png)
This reverts commit 830d70db69
.
The interface isn't fully backwards-compatible, which is bad.
Let's redo this properly after 2.4.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
249 lines
6.1 KiB
C
249 lines
6.1 KiB
C
/*
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* vhost-user.c
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*
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* Copyright (c) 2013 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "clients.h"
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#include "net/vhost_net.h"
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#include "net/vhost-user.h"
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#include "sysemu/char.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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typedef struct VhostUserState {
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NetClientState nc;
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CharDriverState *chr;
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VHostNetState *vhost_net;
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} VhostUserState;
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typedef struct VhostUserChardevProps {
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bool is_socket;
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bool is_unix;
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bool is_server;
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} VhostUserChardevProps;
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VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
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{
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return s->vhost_net;
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}
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static int vhost_user_running(VhostUserState *s)
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{
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return (s->vhost_net) ? 1 : 0;
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}
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static int vhost_user_start(VhostUserState *s)
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{
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VhostNetOptions options;
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if (vhost_user_running(s)) {
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return 0;
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}
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options.backend_type = VHOST_BACKEND_TYPE_USER;
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options.net_backend = &s->nc;
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options.opaque = s->chr;
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s->vhost_net = vhost_net_init(&options);
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return vhost_user_running(s) ? 0 : -1;
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}
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static void vhost_user_stop(VhostUserState *s)
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{
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if (vhost_user_running(s)) {
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vhost_net_cleanup(s->vhost_net);
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}
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s->vhost_net = 0;
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}
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static void vhost_user_cleanup(NetClientState *nc)
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{
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VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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vhost_user_stop(s);
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qemu_purge_queued_packets(nc);
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}
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static bool vhost_user_has_vnet_hdr(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return true;
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}
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static bool vhost_user_has_ufo(NetClientState *nc)
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{
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assert(nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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return true;
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}
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static NetClientInfo net_vhost_user_info = {
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.type = NET_CLIENT_OPTIONS_KIND_VHOST_USER,
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.size = sizeof(VhostUserState),
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.cleanup = vhost_user_cleanup,
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.has_vnet_hdr = vhost_user_has_vnet_hdr,
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.has_ufo = vhost_user_has_ufo,
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};
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static void net_vhost_link_down(VhostUserState *s, bool link_down)
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{
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s->nc.link_down = link_down;
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if (s->nc.peer) {
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s->nc.peer->link_down = link_down;
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}
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if (s->nc.info->link_status_changed) {
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s->nc.info->link_status_changed(&s->nc);
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}
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if (s->nc.peer && s->nc.peer->info->link_status_changed) {
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s->nc.peer->info->link_status_changed(s->nc.peer);
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}
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}
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static void net_vhost_user_event(void *opaque, int event)
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{
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VhostUserState *s = opaque;
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switch (event) {
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case CHR_EVENT_OPENED:
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vhost_user_start(s);
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net_vhost_link_down(s, false);
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error_report("chardev \"%s\" went up", s->chr->label);
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break;
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case CHR_EVENT_CLOSED:
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net_vhost_link_down(s, true);
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vhost_user_stop(s);
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error_report("chardev \"%s\" went down", s->chr->label);
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break;
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}
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}
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static int net_vhost_user_init(NetClientState *peer, const char *device,
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const char *name, CharDriverState *chr)
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{
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NetClientState *nc;
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VhostUserState *s;
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nc = qemu_new_net_client(&net_vhost_user_info, peer, device, name);
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snprintf(nc->info_str, sizeof(nc->info_str), "vhost-user to %s",
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chr->label);
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s = DO_UPCAST(VhostUserState, nc, nc);
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/* We don't provide a receive callback */
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s->nc.receive_disabled = 1;
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s->chr = chr;
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qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
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return 0;
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}
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static int net_vhost_chardev_opts(void *opaque,
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const char *name, const char *value,
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Error **errp)
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{
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VhostUserChardevProps *props = opaque;
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if (strcmp(name, "backend") == 0 && strcmp(value, "socket") == 0) {
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props->is_socket = true;
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} else if (strcmp(name, "path") == 0) {
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props->is_unix = true;
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} else if (strcmp(name, "server") == 0) {
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props->is_server = true;
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} else {
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error_setg(errp,
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"vhost-user does not support a chardev with option %s=%s",
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name, value);
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return -1;
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}
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return 0;
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}
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static CharDriverState *net_vhost_parse_chardev(
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const NetdevVhostUserOptions *opts, Error **errp)
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{
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CharDriverState *chr = qemu_chr_find(opts->chardev);
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VhostUserChardevProps props;
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if (chr == NULL) {
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error_setg(errp, "chardev \"%s\" not found", opts->chardev);
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return NULL;
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}
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/* inspect chardev opts */
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memset(&props, 0, sizeof(props));
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if (qemu_opt_foreach(chr->opts, net_vhost_chardev_opts, &props, errp)) {
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return NULL;
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}
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if (!props.is_socket || !props.is_unix) {
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error_setg(errp, "chardev \"%s\" is not a unix socket",
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opts->chardev);
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return NULL;
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}
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qemu_chr_fe_claim_no_fail(chr);
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return chr;
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}
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static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
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{
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const char *name = opaque;
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const char *driver, *netdev;
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const char virtio_name[] = "virtio-net-";
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driver = qemu_opt_get(opts, "driver");
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netdev = qemu_opt_get(opts, "netdev");
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if (!driver || !netdev) {
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return 0;
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}
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if (strcmp(netdev, name) == 0 &&
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strncmp(driver, virtio_name, strlen(virtio_name)) != 0) {
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error_setg(errp, "vhost-user requires frontend driver virtio-net-*");
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return -1;
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}
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return 0;
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}
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int net_init_vhost_user(const NetClientOptions *opts, const char *name,
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NetClientState *peer, Error **errp)
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{
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const NetdevVhostUserOptions *vhost_user_opts;
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CharDriverState *chr;
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assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
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vhost_user_opts = opts->vhost_user;
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chr = net_vhost_parse_chardev(vhost_user_opts, errp);
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if (!chr) {
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return -1;
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}
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/* verify net frontend */
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if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
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(char *)name, errp)) {
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return -1;
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}
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return net_vhost_user_init(peer, "vhost_user", name, chr);
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}
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