netdev - Re: using software TSO on non-TSO capable netdevices

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Message-ID: <20080807115009.GF7716@xi.wantstofly.org>
Date:	Thu, 7 Aug 2008 13:50:09 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, bhutchings@...arflare.com,
	netdev@...r.kernel.org, akarkare@...vell.com, nico@....org,
	dale@...nsworth.org
Subject: Re: using software TSO on non-TSO capable netdevices

On Wed, Aug 06, 2008 at 11:07:41PM -0700, David Miller wrote:

> > > I would start hacking on this beast but I haven't yet come up with
> > > a clean way to share a lot of code with the existing sw GSO engine.
> > > That's the key to implementing this properly.
> > 
> > I think it's doable.  We could refactor the software GSO so that
> > it spits out one fragment at a time and the output could either
> > be written to some memory provided by the caller or fed through
> > a callback.
> > 
> > BTW, loner term we should start thinking about breaking the 64K
> > barrier.
> 
> So I had this idea.  My goal is to minimize the number of DMA
> mappings the driver has to make.

FWIW, this wouldn't make much of a difference in my case..


> Another nice aspect of this idea is that we can make the existing GSO
> code just build this funny "TSO plus hidden headers" SKB, and then do
> the by-hand unpacking into new SKB chunks that we will let smart
> drivers do directly into their TX rings.

..but I'm pretty sure that this would.
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