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vhost-net: restart tx poll on sk_sndbuf full

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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>
This commit is contained in:
Sridhar Samudrala 2010-02-28 19:39:16 +02:00 committed by Michael S. Tsirkin
parent d6db3f5c11
commit 39286fa41a
1 changed files with 5 additions and 1 deletions
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6
drivers/vhost/net.c
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@ -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);