tun: report orphan frags errors to zero copy callback

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 9e287680cd2ecee393c1acad6f79c925d85bdf72..b44d7b79cddcef3562341c5c8ef78e14479d48fe 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -728,6 +728,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 
 drop:
        dev->stats.tx_dropped++;
+       skb_tx_error(skb);
        kfree_skb(skb);
        rcu_read_unlock();
        return NETDEV_TX_OK;