linux-kernel - Re: [RFC] net: napi fix

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Message-ID: <4761B933.4030008@gmail.com>
Date:	Thu, 13 Dec 2007 23:58:59 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	auke-jan.h.kok@...el.com, gallatin@...i.com, joonwpark81@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jgarzik@...ox.com, shemminger@...ux-foundation.org,
	jesse.brandeburg@...el.com
Subject: Re: [RFC] net: napi fix

David Miller wrote, On 12/13/2007 11:34 PM:

> From: Jarek Poplawski <jarkao2@...il.com>
> Date: Thu, 13 Dec 2007 23:28:41 +0100
> 
>> ...I'm afraid I can't understand: I mean doing the same but without
>> passing this info with 'work == weight': if driver sends this info,
>> why it can't instead call something like napi_continue() with
>> this list_move_tail() (and probably additional local_irq_disable()/
>> enble() - but since it's unlikely()?) which looks much more readable,
>> and saves one whole unlikely if ()?
> 
> Because the poll list is private to net_rx_action() and we don't
> want to expose implementation details like that to every
> ->poll() implementation.

So, it seems 'we' failed e.g. exposing napi_complete()...
OK, no offense, I'll only mention at the end that there is
always a possibility to redefine such a function to {} with any
change of implementation.

Jarek P.
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