linux-kernel - Re: [PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in netdevice

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Message-ID: <1305671318.10756.49.camel@localhost.localdomain>
Date:	Tue, 17 May 2011 15:28:38 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	Michał Mirosław <mirqus@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in
 netdevice

On Tue, 2011-05-17 at 23:48 +0200, Michał Mirosław wrote:
> 2011/5/17 Shirley Ma <mashirle@...ibm.com>:
> > Hello Michael,
> >
> > Looks like to use a new flag requires more time/work. I am thinking
> > whether we can just use HIGHDMA flag to enable zero-copy in macvtap
> to
> > avoid the new flag for now since mavctap uses real NICs as lower
> device?
> 
> Is there any other restriction besides requiring driver to not recycle
> the skb? Are there any drivers that recycle TX skbs? 

Not more other restrictions, skb clone is OK. pskb_expand_head() looks
OK to me from code review.

Currently there is no drivers recycle TX skbs.

Thanks
Shirley

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