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

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Message-ID: <1303328906.2823.24.camel@bwh-desktop>
Date:	Wed, 20 Apr 2011 20:48:26 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	David Miller <davem@...emloft.net>, mst@...hat.com,
	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 Wed, 2011-04-20 at 12:44 -0700, Shirley Ma wrote:
> This zerocopy flag is used to support device DMA userspace buffers.
> 
> Signed-off-by: Shirley Ma <xma@...ibm.com>
> ---
> 
>  include/linux/netdevice.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 0249fe7..0998d3d 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1067,6 +1067,9 @@ struct net_device {
>  #define NETIF_F_RXHASH		(1 << 28) /* Receive hashing offload */
>  #define NETIF_F_RXCSUM		(1 << 29) /* Receive checksumming offload */
>  
> +/* bit 29 is for device to map userspace buffers -- zerocopy */
> +#define NETIF_F_ZEROCOPY	(1 << 29)

Look above.

Ben.

>  	/* Segmentation offload features */
>  #define NETIF_F_GSO_SHIFT	16
>  #define NETIF_F_GSO_MASK	0x00ff0000
> 
> 
> --
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-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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