netdev - Re: [PATCH net-next] net/mlx4_en: call gro handler for encapsulated frames

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Date:	Thu, 09 Jan 2014 14:57:26 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <or.gerlitz@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jerry Chu <hkchu@...gle.com>
Subject: Re: [PATCH net-next] net/mlx4_en: call gro handler for encapsulated
 frames

On Fri, 2014-01-10 at 00:24 +0200, Or Gerlitz wrote:
> On Thu, Jan 9, 2014 at 8:30 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > From: Eric Dumazet <edumazet@...gle.com>
> >
> > In order to use the native GRO handling of encapsulated protocols on
> > mlx4, we need to call napi_gro_receive() instead of netif_receive_skb()
> > unless busy polling is in action.
> >
> > While we are at it, rename mlx4_en_cq_ll_polling() to
> > mlx4_en_cq_busy_polling()
> >
> > Tested with GRE tunnel : GRO aggregation is now performed on the
> > ethernet device instead of being done later on gre device.
> 
> Hi Eric,
> 
> Just to make clear, this patch serves (very nicely!) encapsulated
> frames for which the HW is not able to do checksum check. For
> non-encapsulated packets or (e.g) vxlan encapsulated packets which are
> checksummed  by the HW we already go to the GRO path of the ethernet
> device.

Yes : mlx4 has two different paths, one calling napi_gro_frags(), and
one calling netif_receive_skb()

Obviously, the path calling napi_gro_frags() is already GRO enabled ;)

So if you are saying vxlan hits napi_gro_frags(), thats good to know,
but doesn't seem to be the case for GRE, IPIP, SIT tunnels.



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