netdev - Re: [PATCH] vlan: enable GRO if real

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Date:	Wed, 15 Sep 2010 19:08:40 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Brandon Philips <bphilips@...e.de>
Cc:	David Miller <davem@...emloft.net>, jeffrey.t.kirsher@...el.com,
	jesse.brandeburg@...el.com, bruce.w.allan@...el.com,
	alexander.h.duyck@...el.com, peter.p.waskiewicz.jr@...el.com,
	john.ronciak@...el.com, donald.c.skidmore@...el.com,
	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH] vlan: enable GRO if real_dev supports it

Le mercredi 15 septembre 2010 à 09:37 -0700, Brandon Philips a écrit :
> Currently vlan devices don't have GRO by default as none of the Ethernet
> drivers add NETIF_F_GRO to their vlan_features.
> 
> As GRO is a software feature just propogate GRO from the real_dev in the
> vlan core. There is no need to have the drivers each add NETIF_F_GRO to
> their vlan_features.
> 
> Signed-off-by: Brandon Philips <bphilips@...e.de>
> ---
>  net/8021q/vlan_dev.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
> index 3bccdd1..6fbc445 100644
> --- a/net/8021q/vlan_dev.c
> +++ b/net/8021q/vlan_dev.c
> @@ -735,6 +735,7 @@ static int vlan_dev_init(struct net_device *dev)
>  					  (1<<__LINK_STATE_DORMANT))) |
>  		      (1<<__LINK_STATE_PRESENT);
>  
> +	dev->features |= real_dev->features & NETIF_F_GRO;
>  	dev->features |= real_dev->features & real_dev->vlan_features;
>  	dev->gso_max_size = real_dev->gso_max_size;
>  

Hmm, this is only part of a generic solution.

If I enable gro with "ethtool -K eth0 gro on", should we propagate GRO
on vlan eth0.555 ?



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