netdev - Re: [PATCH] net: use hardware buffer pool to allocate skb

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Message-ID: <1413554709.24953.5.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 17 Oct 2014 07:05:09 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>
Cc:	Alexander Duyck <alexander.h.duyck@...hat.com>,
	David Miller <davem@...emloft.net>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"LeoLi@...escale.com" <LeoLi@...escale.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] net: use hardware buffer pool to allocate skb

On Fri, 2014-10-17 at 02:35 +0000, Jiafei.Pan@...escale.com wrote:

> [Pan Jiafei] Hi, Alex, thanks for your comments. I don’t confirm that
> you have catch my concerns. For example, I want to add igb net card 
> into my bridge, and want to igb net driver allocate skb by using
> my specified memory address, but I don’t want to modify igb net driver
> directly, how to do this in my bridge drivers?

This is exactly our point : We do not want to modify all drivers so that
your bridge is happy with them.

You'll have to make your bridge using standard infra instead.

IGB has no way to know in advance that a particular frame should
eventually reach your bridge anyway.



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