netdev - Re: [PATCH V3 2/8] Add a new zerocopy device flag

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Message-ID: <1304362028.20660.15.camel@localhost.localdomain>
Date:	Mon, 02 May 2011 11:47:08 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	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 V3 2/8] Add a new zerocopy device flag

On Mon, 2011-05-02 at 13:42 +0300, Michael S. Tsirkin wrote:
> This comment should specify what exactly is the promise the
> device makes by setting this flag. Specifically, the
> condition is that no skb fragments are used
> after the uinfo callback has been called.
> 
> The way it's implemented, it probably means the device
> should not use any of skb_clone, expand head etc.

Agree. Or maybe force a copy when device uses skb_clone, expand
head ...?

Thanks
Shirley

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