netdev - Re: [PATCH] veth: remove hardware checksum feature

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Date:	Thu, 08 Aug 2013 15:35:44 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH] veth: remove hardware checksum feature

On 08/08/2013 03:22 PM, Eric Dumazet wrote:
> On Thu, 2013-08-08 at 15:13 -0700, Ben Greear wrote:
>
>> Looks like it should work nicely, except it would be really
>> nice if I could short-circuit the xmit_nit() part for my
>> protocol handler.
>>
>> Think there would be any interest in allowing the ptype_all
>> handlers to optionally register a direction (ie tx-only, rx-only, both)
>> and have dev_queue_xmit_nit() pay attention to that?
>
> Sure, it would also make sense to apply the BPF filter _before_ doing
> the skb_clone()
>
> Right now, we :
>
> clone packets
> -> deliver the clone to the sniffer.
>   sniffer eventuall drops the packet after BPF filtering.
>
> Its trivial to test the tx/rx thing in BPF, and it's JIT code.

I'm actually registering the hook from a kernel module and
doing the bridging in this module.  I'm not using sockets or
BPF like a sniffer would...

I think for my own use, just causing the skb_loop_sk() method to
return true would be optimal, but in general I like your idea.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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