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

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Message-ID: <489B5BC5.3030600@hp.com>
Date:	Thu, 07 Aug 2008 13:32:05 -0700
From:	Rick Jones <rick.jones2@...com>
To:	David Miller <davem@...emloft.net>
CC:	herbert@...dor.apana.org.au, bhutchings@...arflare.com,
	buytenh@...tstofly.org, netdev@...r.kernel.org,
	akarkare@...vell.com, nico@....org, dale@...nsworth.org
Subject: Re: using software TSO on non-TSO capable netdevices

David Miller wrote:
> So I had this idea.  My goal is to minimize the number of DMA
> mappings the driver has to make.
> 
> We don't touch anything in the original TSO skb.  However we expand
> the headroom (if necessary) and in the area in front of skb->data we
> build the header areas for the sub-TSO frames, one by one.
> 
> We give the driver some iterator functions that walk through the
> header areas and compute offset/length pairs into the
> skb_shared_info() page list.

Is that like Solaris Multi Data Transmit?

rick jones
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