netdev - Re: [PATCH net 1/2] net: dev_queue_xmit_nit: fix skb->vlan

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Date:	Tue, 08 Jan 2013 12:42:45 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Ani Sinha <ani@...stanetworks.com>,
	Jiri Pirko <jpirko@...hat.com>
Subject: Re: [PATCH net 1/2] net: dev_queue_xmit_nit: fix skb->vlan_tci
 field value

On Tue, 2013-01-08 at 21:22 +0100, Jiri Pirko wrote:

> 
> The issue is that for exmaple in af_packet the function packet_rcv()
> expects vlan_tci to be filled out as that is on RX path ensured by
> __netif_receive_skb(). However on TX path, dev_queue_xmit_nit() is
> called with vlan_tci cleaned in case the device does not have TX vlan
> accel enabled. This patch is trying to fix this difference.

I perfectly understood that, and I repeat :

I want to see the difference.

A filter cannot expect skb->vlan_tci is set for all packets.

If a device doesn't have TX vlan accel, vlan_tci is 0.

packet sniffing is already slow, we don't want to force an extra copy
with vlan_untag() killer.

If you want to fix/extend af_packet, do this in af_packet.



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