From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: [PATCH net-next 3/8] tun: report orphan frags errors to zero copy callback Date: Mon, 29 Oct 2012 17:49:46 +0200 Message-ID: <8802a5f3d1556574df1e62279d2788462d23430d.1351524501.git.mst@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Alexander Duyck , Ian Campbell , kvm@vger.kernel.org, "Michael S. Tsirkin" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Eric Dumazet , Andrew Morton , "David S. Miller" Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org 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 --- 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