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vhost-net: save & restore vring enable state 

A driver may change the vring enable state at run time but vhost-user
backend may not be present (a contrived example is when the backend is
disconnected and the device is reconfigured after driver rebinding)

Restore the vring state when the vhost-user backend is started, so it
can process the ring.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Victor Kaplansky <victork@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Marc-André Lureau 2016-06-06 18:45:06 +02:00 committed by Michael S. Tsirkin
parent a463215b08
commit bfc6cf31ce
2 changed files with 12 additions and 0 deletions
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11
hw/net/vhost_net.c
View File

@ -329,6 +329,15 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
if (r < 0) {
goto err_start;
}
if (ncs[i].peer->vring_enable) {
/* restore vring enable state */
r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
if (r < 0) {
goto err_start;
}
}
}
return 0;
@ -422,6 +431,8 @@ int vhost_set_vring_enable(NetClientState *nc, int enable)
VHostNetState *net = get_vhost_net(nc);
const VhostOps *vhost_ops;
nc->vring_enable = enable;
if (!net) {
return 0;
}

1
include/net/net.h
View File

@ -99,6 +99,7 @@ struct NetClientState {
NetClientDestructor *destructor;
unsigned int queue_index;
unsigned rxfilter_notify_enabled:1;
int vring_enable;
QTAILQ_HEAD(NetFilterHead, NetFilterState) filters;
};