netdev - Re: [PATCH] - gre: add eth_p_teb gro-handler for OVS with gre tunnels

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Date:	Mon, 12 Oct 2015 16:47:19 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Ramu Ramamurthy <sramamur@...ux.vnet.ibm.com>
Cc:	Tom Herbert <tom@...bertland.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Jerry Chu <hkchu@...gle.com>, Netdev <netdev@...r.kernel.org>,
	Davem <davem@...emloft.net>, J Kidambi <jkidambi@...ibm.com>,
	manand@...ibm.com
Subject: Re: [PATCH] - gre: add eth_p_teb gro-handler for OVS with gre tunnels

On Mon, Oct 12, 2015 at 3:26 PM, Ramu Ramamurthy
<sramamur@...ux.vnet.ibm.com> wrote:
>
> Problem:
> --------
>
> When using OVS with GRE tunnels, and GRO is enabled on the nic,
> We find that GRO doesnt really take effect. As a result, TCP stream
> performance on a 10G nic is around 2-3Gbps.
>
> Root Cause:
> -----------
>
> The protocol field set in GRE (by OVS) is ETH_P_TEB.
> The code in gre_gro_receive() (gre_offload.c) calls
> gro_find_receive_by_type() to determine a gro handler for the
> ETH_P_TEB protocol. However, no such protocol is registered
> at the device layer (only ETH_P_IP, ETH_P_IPV6, and mpls related
> protocols are registered). Hence, GRO is skipped.

Why doesn't this work?

commit 9b174d88c257150562b0101fcc6cb6c3cb74275c
Author: Jesse Gross <jesse@...ira.com>
Date:   Tue Dec 30 19:10:15 2014 -0800

    net: Add Transparent Ethernet Bridging GRO support.

    Currently the only tunnel protocol that supports GRO with encapsulated
    Ethernet is VXLAN. This pulls out the Ethernet code into a proper layer
    so that it can be used by other tunnel protocols such as GRE and Geneve.

    Signed-off-by: Jesse Gross <jesse@...ira.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>
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