[PATCHv2 net-next 3/8] tun: report orphan frags errors to zero copy callback
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2012-10-31 10:29:05
Also in:
lkml, netdev, virtualization
Subsystem:
networking drivers, the rest, tun/tap driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Willem de Bruijn, Jason Wang
When tun transmits a zero copy skb, it orphans the frags which might need to allocate extra memory, in atomic context. If that fails, notify ubufs callback before freeing the skb as a hint that device should disable zerocopy mode. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- drivers/net/tun.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 3157519..613f826 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c@@ -433,6 +433,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) drop: dev->stats.tx_dropped++; + skb_tx_error(skb, -ENOMEM); kfree_skb(skb); return NETDEV_TX_OK; }
--
MST