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

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Message-ID: <aeef795129504782ae1e9f91467d243e@BLUPR03MB517.namprd03.prod.outlook.com>
Date:	Thu, 16 Oct 2014 05:15:30 +0000
From:	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	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>,
	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>
Subject: RE: [PATCH] net: use hardware buffer pool to allocate skb

> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Thursday, October 16, 2014 12:15 PM
> To: Pan Jiafei-B37022
> Cc: David Miller; jkosina@...e.cz; netdev@...r.kernel.org; Li Yang-Leo-R58472;
> linux-doc@...r.kernel.org
> Subject: Re: [PATCH] net: use hardware buffer pool to allocate skb
> 
> On Thu, 2014-10-16 at 02:17 +0000, Jiafei.Pan@...escale.com wrote:
> 
> > Thanks for your comments and suggestion. In my case, I want to build skb
> > from hardware block specified memory, I only can see two ways, one is modified
> > net card driver replace common skb allocation function with my specially
> > functions, another way is to hack common skb allocation function in which
> > redirect to my specially functions. My patch is just for the second way.
> > Except these two ways, would you please give me some advice for some other
> > ways for my case? Thanks
> 
> I suggest you read drivers/net/ethernet numerous examples.
> 
> No need to change anything  in net/* or include/*, really.
> 
> For a start, look at drivers/net/ethernet/intel/igb/igb_main.c
> 
> Mentioning 'hack' in your mails simply should hint you are doing
> something very wrong.
> 
> What makes you think your hardware is so special ?
> 
In fact, I am developing a bridge driver, it can bridge between any other the
third party net card and my own net card. My target is to let any other the
third party net card can directly use my own net card specified buffer, then
there will be no memory copy in the whole bridge process.
By the way, I don’t see any similar between igb_main.c and my case. And also
My bridge also can’t implemented with "skb frag" in order to aim at zero memory
copy.