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authorMichael S. Tsirkin <mst@redhat.com>2012-12-06 14:03:34 +0200
committerMichael S. Tsirkin <mst@redhat.com>2012-12-06 17:09:18 +0200
commit935cdee7ee159569b0aaa10bd9244660f6672b08 (patch)
tree366e06bee572c2578fcce51926a8ae25e04ce66d /drivers/vhost/net.c
parent4a7d6455b07845d92e025da222f11de519f90def (diff)
downloadlinux-935cdee7ee159569b0aaa10bd9244660f6672b08.tar.bz2
vhost: avoid backend flush on vring ops
vring changes already do a flush internally where appropriate, so we do not need a second flush. It's currently not very expensive but a follow-up patch makes flush more heavy-weight, so remove the extra flush here to avoid regressing performance if call or kick fds are changed on data path. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/net.c')
-rw-r--r--drivers/vhost/net.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index ff6c91995c96..1802ab662082 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -942,8 +942,11 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
return vhost_net_reset_owner(n);
default:
mutex_lock(&n->dev.mutex);
- r = vhost_dev_ioctl(&n->dev, ioctl, arg);
- vhost_net_flush(n);
+ r = vhost_dev_ioctl(&n->dev, ioctl, argp);
+ if (r == -ENOIOCTLCMD)
+ r = vhost_vring_ioctl(&n->dev, ioctl, argp);
+ else
+ vhost_net_flush(n);
mutex_unlock(&n->dev.mutex);
return r;
}