netdev - Re: [RFC][NET-NEXT PATCH 2/2] net: Add GSO to vlan

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Date:	Fri, 24 Jun 2011 17:51:42 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Shan Wei <shanwei@...fujitsu.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	"therbert@...gle.com" <therbert@...gle.com>
Subject: Re: [RFC][NET-NEXT PATCH 2/2] net: Add GSO to vlan_features
 initialization

On Fri, 2011-06-24 at 11:38 +0800, Shan Wei wrote:
> This patch is not a bug fix.
> Just add GSO to vlan_features initialization, and update comments.
> 
> 
> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>
> ---
>  net/core/dev.c |    9 +++++----
>  1 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 6b6ef14..becc1e5 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5478,11 +5478,12 @@ int register_netdevice(struct net_device *dev)
>  		dev->features |= NETIF_F_NOCACHE_COPY;
>  	}
>  
> -	/* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
> -	 * vlan_dev_init() will do the dev->features check, so these features
> -	 * are enabled only if supported by underlying device.
> +	/* Enable GSO, GRO and NETIF_F_HIGHDMA for vlans by default,
> +	 * vlan_dev_fix_features() will do the features check,
> +	 * so NETIF_F_HIGHDMA feature is enabled only if supported
> +	 * by underlying device.
>  	 */
> -	dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
> +	dev->vlan_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_HIGHDMA);
>  
>  	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
>  	ret = notifier_to_errno(ret);

Have you verified that GSO works correctly for VLAN devices if the
underlying device does not support VLAN tag insertion?
skb_gso_segment() has code to handle this case, but I suspect it's not
actually being exercised at the moment.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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