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/*
* 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/error-report.h"
typedef struct VhostUserState {
NetClientState nc;
CharDriverState *chr;
bool vhostforce;
VHostNetState *vhost_net;
} VhostUserState;
VHostNetState *vhost_user_get_vhost_net(NetClientState *nc)
{
VhostUserState *s = DO_UPCAST(VhostUserState, nc, nc);
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;
options.force = s->vhostforce;
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 = 0,
.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\n", s->chr->label);
break;
case CHR_EVENT_CLOSED:
net_vhost_link_down(s, true);
vhost_user_stop(s);
error_report("chardev \"%s\" went down\n", s->chr->label);
break;
}
}
static int net_vhost_user_init(NetClientState *peer, const char *device,
const char *name, CharDriverState *chr,
bool vhostforce)
{
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;
s->vhostforce = vhostforce;
qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
return 0;
}
int net_init_vhost_user(const NetClientOptions *opts, const char *name,
NetClientState *peer)
{
return net_vhost_user_init(peer, "vhost_user", 0, 0, 0);
}
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