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

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Message-ID: <BANLkTimvOK3tyo6+L5AD=so5DjiDPV-AAA@mail.gmail.com>
Date:	Tue, 17 May 2011 23:48:21 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Shirley Ma <mashirle@...ibm.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

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?

Best Regards,
Michał Mirosław
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