netdev - Re: [PATCH v2.57] datapath: Add basic MPLS support to kernel

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Message-ID: <20140520121837.GC23328@casper.infradead.org>
Date:	Tue, 20 May 2014 13:18:37 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Jesse Gross <jesse@...ira.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>,
	Pravin B Shelar <pshelar@...ira.com>,
	Ben Pfaff <blp@...ira.com>, Ravi K <rkerur@...il.com>,
	Joe Stringer <joe@...d.net.nz>
Subject: Re: [PATCH v2.57] datapath: Add basic MPLS support to kernel

On 05/20/14 at 07:02am, Simon Horman wrote:
> [PATCH] datapath: 16bit inner_network_header field in struct ovs_gso_cb
> 
> The motivation for this is to create a 16bit hole in struct ovs_gso_cb
> which may be used for the inner_protocol field which is needed
> for the proposed implementation of compatibility for MPLS GSO segmentation.
> 
> This should be safe as inner_network_header is now an offset to
> the inner_mac_header rather than skb->head.
> 
> As pointed out by Thomas Graf simply making both inner offsets 16bis is not
> safe as there have been cases of overflow with "with collapsed TCP frames
> on IB when the headroom grew beyond 64K. See commit 50bceae9bd ``tcp:
> Reallocate headroom if it would overflow csum_start'' for additional
> details."
> 
> This patch is based on suggestions by Thomas Graf and Jesse Gross.
> 
> Cc: Thomas Graf <tgraf@...g.ch>
> Cc: Jesse Gross <jesse@...ira.com>
> Signed-off-by: Simon Horman <horms@...ge.net.au>

LGTM

Reviewed-by: Thomas Graf <tgraf@...g.ch>
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