netdev - Re: [PATCH v2 net-next-2.6] packet: Add GSO/csum offload support.

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Date:	Thu, 04 Feb 2010 15:49:01 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sri@...ibm.com
Cc:	herbert@...dor.apana.org.au, mst@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next-2.6] packet: Add GSO/csum offload support.

From: Sridhar Samudrala <sri@...ibm.com>
Date: Wed, 03 Feb 2010 15:22:20 -0800

> This patch adds GSO/checksum offload to af_packet sockets using
> virtio_net_hdr. Based on Rusty's patch to add this support to tun.
> It allows GSO/checksum offload to be enabled when using raw socket
> backend with virtio_net.
> Adds PACKET_VNET_HDR socket option to prepend virtio_net_hdr in the
> receive path and process/skip virtio_net_hdr in the send path. This
> option is only allowed with SOCK_RAW sockets attached to ethernet
> type devices.
> 
> v2 updates
> ----------
> Michael's Comments
> - Perform length check in packet_snd() when GSO is off even when
>   vnet_hdr is present.
> - Check for SKB_GSO_FCOE type and return -EINVAL
> - don't allow tx/rx ring when vnet_hdr is enabled.
> Herbert's Comments
> - Removed ethernet specific code.
> - protocol value is assumed to be passed in by the caller.
> 
> Signed-off-by: Sridhar Samudrala <sri@...ibm.com>

Herbert et al. could you guys review this?

Thanks.
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