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

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Message-ID: <CAOxq_8OsumXX92odrVcREqsLkeUkcS_0uQvbdaTmtyr1HtuTOw@mail.gmail.com>
Date:	Wed, 9 Jan 2013 12:01:06 -0800
From:	Ani Sinha <ani@...stanetworks.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	tcpdump-workers@...ts.tcpdump.org,
	Paul Pearce <pearce@...berkeley.edu>, netdev@...r.kernel.org,
	dborkman <dborkman@...hat.com>, edumazet <edumazet@...gle.com>,
	Jiri Pirko <jpirko@...hat.com>
Subject: Re: [PATCH net 1/2] net: dev_queue_xmit_nit: fix skb->vlan_tci field value

On Wed, Jan 9, 2013 at 11:51 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2013-01-09 at 11:27 -0800, Ani Sinha wrote:
>
>> This is wrong. Accelerated or not, the kernel code was organized to
>> have the tags in the packet aux data. So I think this is how user land
>> should be coded as well.
>
> You have your opinion, thats good.
>
> My opinion as a kernel developer is that the network tap is here to have
> a copy of the exact frame given to the _device_.
>

It is fine by me if that is how you see it. In that case. the
behaviour can me made symmetric on both TX and RX. Tap processing in
__netif_receive_skb() can be done before vlan_untag() so that taps see
the exact frame received from the _device_ as you put it.

ani
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