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virtio-net: unify vhost-net start/stop

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Move all of vhost-net start/stop logic to a single routine,
and call it from everywhere.

Additionally, start/stop vhost-net on link up/down:
we should not transmit anything if user asked us to
put the link down.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2010-09-27 18:41:30 +02:00
parent e0c472d8c2
commit afbaa7b438
1 changed files with 43 additions and 46 deletions
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89
hw/virtio-net.c
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@ -54,6 +54,7 @@ typedef struct VirtIONet
uint8_t nouni; uint8_t nouni;
uint8_t nobcast; uint8_t nobcast;
uint8_t vhost_started; uint8_t vhost_started;
bool vm_running;
VMChangeStateEntry *vmstate; VMChangeStateEntry *vmstate;
struct { struct {
int in_use; int in_use;
@ -98,6 +99,38 @@ static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
} }
} }
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
{
VirtIONet *n = to_virtio_net(vdev);
if (!n->nic->nc.peer) {
return;
}
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
return;
}
if (!tap_get_vhost_net(n->nic->nc.peer)) {
return;
}
if (!!n->vhost_started == ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
(n->status & VIRTIO_NET_S_LINK_UP) &&
n->vm_running)) {
return;
}
if (!n->vhost_started) {
int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
if (r < 0) {
fprintf(stderr, "unable to start vhost net: %d: "
"falling back on userspace virtio\n", -r);
} else {
n->vhost_started = 1;
}
} else {
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
n->vhost_started = 0;
}
}
static void virtio_net_set_link_status(VLANClientState *nc) static void virtio_net_set_link_status(VLANClientState *nc)
{ {
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
@ -110,6 +143,8 @@ static void virtio_net_set_link_status(VLANClientState *nc)
if (n->status != old_status) if (n->status != old_status)
virtio_notify_config(&n->vdev); virtio_notify_config(&n->vdev);
virtio_net_set_status(&n->vdev, n->vdev.status);
} }
static void virtio_net_reset(VirtIODevice *vdev) static void virtio_net_reset(VirtIODevice *vdev)
@ -123,10 +158,6 @@ static void virtio_net_reset(VirtIODevice *vdev)
n->nomulti = 0; n->nomulti = 0;
n->nouni = 0; n->nouni = 0;
n->nobcast = 0; n->nobcast = 0;
if (n->vhost_started) {
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev);
n->vhost_started = 0;
}
/* Flush any MAC and VLAN filter table state */ /* Flush any MAC and VLAN filter table state */
n->mac_table.in_use = 0; n->mac_table.in_use = 0;
@ -783,12 +814,9 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
{ {
VirtIONet *n = opaque; VirtIONet *n = opaque;
if (n->vhost_started) { /* At this point, backend must be stopped, otherwise
/* TODO: should we really stop the backend? * it might keep writing to memory. */
* If we don't, it might keep writing to memory. */ assert(!n->vhost_started);
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
n->vhost_started = 0;
}
virtio_save(&n->vdev, f); virtio_save(&n->vdev, f);
qemu_put_buffer(f, n->mac, ETH_ALEN); qemu_put_buffer(f, n->mac, ETH_ALEN);
@ -924,44 +952,14 @@ static NetClientInfo net_virtio_info = {
.link_status_changed = virtio_net_set_link_status, .link_status_changed = virtio_net_set_link_status,
}; };
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
{
VirtIONet *n = to_virtio_net(vdev);
if (!n->nic->nc.peer) {
return;
}
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
return;
}
if (!tap_get_vhost_net(n->nic->nc.peer)) {
return;
}
if (!!n->vhost_started == !!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return;
}
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), vdev);
if (r < 0) {
fprintf(stderr, "unable to start vhost net: %d: "
"falling back on userspace virtio\n", -r);
} else {
n->vhost_started = 1;
}
} else {
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev);
n->vhost_started = 0;
}
}
static void virtio_net_vmstate_change(void *opaque, int running, int reason) static void virtio_net_vmstate_change(void *opaque, int running, int reason)
{ {
VirtIONet *n = opaque; VirtIONet *n = opaque;
uint8_t status = running ? VIRTIO_CONFIG_S_DRIVER_OK : 0; n->vm_running = running;
/* This is called when vm is started/stopped, /* This is called when vm is started/stopped,
* it will start/stop vhost backend if * appropriate * it will start/stop vhost backend if appropriate
* e.g. after migration. */ * e.g. after migration. */
virtio_net_set_status(&n->vdev, n->vdev.status & status); virtio_net_set_status(&n->vdev, n->vdev.status);
} }
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
@ -1028,9 +1026,8 @@ void virtio_net_exit(VirtIODevice *vdev)
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev);
qemu_del_vm_change_state_handler(n->vmstate); qemu_del_vm_change_state_handler(n->vmstate);
if (n->vhost_started) { /* This will stop vhost backend if appropriate. */
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); virtio_net_set_status(vdev, 0);
}
qemu_purge_queued_packets(&n->nic->nc); qemu_purge_queued_packets(&n->nic->nc);