netdev - Re: [PATCH v5 net-next] MPLS: Use mpls_features to activate software MPLS GSO segmentation

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Message-Id: <20140605.150542.874543494136715316.davem@davemloft.net>
Date:	Thu, 05 Jun 2014 15:05:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	horms@...ge.net.au
Cc:	netdev@...r.kernel.org, jesse@...ira.com, tgraf@...g.ch,
	yamamoto@...inux.co.jp, dev@...nvswitch.org
Subject: Re: [PATCH v5 net-next] MPLS: Use mpls_features to activate
 software MPLS GSO segmentation

From: Simon Horman <horms@...ge.net.au>
Date: Wed,  4 Jun 2014 08:53:17 +0900

> If an MPLS packet requires segmentation then use mpls_features
> to determine if the software implementation should be used.
> 
> As no driver advertises MPLS GSO segmentation this will always be
> the case.
> 
> I had not noticed that this was necessary before as software MPLS GSO
> segmentation was already being used in my test environment. I believe that
> the reason for that is the skbs in question always had fragments and the
> driver I used does not advertise NETIF_F_FRAGLIST (which seems to be the
> case for most drivers). Thus software segmentation was activated by
> skb_gso_ok().
> 
> This introduces the overhead of an extra call to skb_network_protocol()
> in the case where where CONFIG_NET_MPLS_GSO is set and
> skb->ip_summed == CHECKSUM_NONE.
> 
> Thanks to Jesse Gross for prompting me to investigate this.
> 
> Signed-off-by: Simon Horman <horms@...ge.net.au>
> Acked-by: YAMAMOTO Takashi <yamamoto@...inux.co.jp>

Applied to net-next, thanks Simon.
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