Commit 39286fa4 authored Feb 28, 2010 by Sridhar Samudrala Committed by Michael S. Tsirkin Feb 28, 2010

vhost-net: restart tx poll on sk_sndbuf full

guest to remote communication with vhost net sometimes stops until
guest driver is restarted. This happens when we get guest kick precisely
when the backend send queue is full, as a result handle_tx() returns without
polling backend. This patch fixes this by restarting tx poll on this condition.

Signed-off-by: Sridhar Samudrala <samudrala@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Tom Lendacky <toml@us.ibm.com>

parent d6db3f5c

drivers/vhost/net.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -114,8 +114,12 @@ static void handle_tx(struct vhost_net *net)
		return;

		wmem = atomic_read(&sock->sk->sk_wmem_alloc);
		if (wmem >= sock->sk->sk_sndbuf)
		if (wmem >= sock->sk->sk_sndbuf) {
		mutex_lock(&vq->mutex);
		tx_poll_start(net, sock);
		mutex_unlock(&vq->mutex);
		return;
		}

		use_mm(net->dev.mm);
		mutex_lock(&vq->mutex);

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