netdev - Re: [PATCH v2 2/3] net_sched: Add accessor function for packet length for qdiscs

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Date:	Wed, 30 Jul 2008 13:52:01 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
CC:	jarkao2@...il.com, jussi.kivilinna@...et.fi, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/3] net_sched: Add accessor function for packet length
 for qdiscs

David Miller wrote:
> From: Patrick McHardy <kaber@...sh.net>
> Date: Wed, 30 Jul 2008 13:40:22 +0200
> 
>> The reason why it translates it at all seems to be to not increase
>> the drops counter. Within a single qdisc this could be avoided by
>> other means easily, upper qdiscs would still increase the counter
>> when we return anything besides NET_XMIT_SUCCESS though.
>>
>> This means we need a new NET_XMIT return value to indicate this to
>> the upper qdiscs. So I'd suggest to introduce NET_XMIT_STOLEN,
>> return that to upper qdiscs and translate it to NET_XMIT_SUCCESS
>> in dev_queue_xmit, similar to NET_XMIT_BYPASS.
> 
> Maybe these NET_XMIT_* values being passed around should be a set of
> bits.
> 
> They could be composed of base meanings, combined with specific
> attributes.
> 
> So you could say "NET_XMIT_DROP | __NET_XMIT_NO_DROP_COUNT"
> 
> The attributes get masked out by the top-level ->enqueue() caller,
> such that the base meanings are the only thing that make their
> way up into the stack.
> 
> If it's only about communication within the qdisc tree, let's
> simply code it that way.

Thats a good suggestion. I think this should work.

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