linux-kernel - [PATCH net-next 3/8] tun: report orphan frags errors to zero copy callback

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Message-ID: <8802a5f3d1556574df1e62279d2788462d23430d.1351524501.git.mst@redhat.com>
Date:	Mon, 29 Oct 2012 17:49:46 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Ian Campbell <Ian.Campbell@...rix.com>, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/8] 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@...hat.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

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