Re: [PATCH net-next] tun: return NET_XMIT_DROP for dropped packets

From: Cong Wang
Date: Tue Nov 18 2014 - 14:53:34 EST

On Mon, Nov 17, 2014 at 9:20 PM, Jason Wang <jasowang@xxxxxxxxxx> wrote:
> After commit 5d097109257c03a71845729f8db6b5770c4bbedc
> ("tun: only queue packets on device"), NETDEV_TX_OK was returned for
> dropped packets. This will confuse pktgen since dropped packets were
> counted as sent ones.
> Fixing this by returning NET_XMIT_DROP to let pktgen count it as error
> packet.

pktgen is suspicious, it sends out packets directly without going through
qdisc, so it should not care about NET_XMIT_* qdisc error code?

Looks like NETDEV_TX_OK doesn't have to mean TX is successful,
the comment says driver takes care of the packet, can be either dropped
or sent out. We might need a new code to distinguish success or failure.
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