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authorSridhar Samudrala <samudrala@us.ibm.com>2010-02-28 18:39:16 +0100
committerMichael S. Tsirkin <mst@redhat.com>2010-02-28 18:50:33 +0100
commit39286fa41a8b2c6a9c1f656a7b3c3efca95bc1b9 (patch)
tree1639935ff004a1ba9452314bd8921f81058bb29a /drivers/vhost
parentvhost: fix get_user_pages_fast error handling (diff)
downloadlinux-39286fa41a8b2c6a9c1f656a7b3c3efca95bc1b9.tar.xz
linux-39286fa41a8b2c6a9c1f656a7b3c3efca95bc1b9.zip
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/net.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 91a324cc2298..ad37da2b6cb5 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -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);