netdev - Re: [PATCH v3 net-next] net: introduce dev_set

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Message-ID: <1383407176.2764.17.camel@deadeye.wl.decadent.org.uk>
Date:	Sat, 2 Nov 2013 15:46:16 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	<christoph.paasch@...ouvain.be>, <herbert@...dor.apana.org.au>,
	<netdev@...r.kernel.org>, <hkchu@...gle.com>, <mwdalton@...gle.com>
Subject: Re: [PATCH v3 net-next] net: introduce dev_set_forwarding()

On Sat, 2013-11-02 at 07:01 -0700, Eric Dumazet wrote:
[...]
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
[...]
> -void dev_disable_lro(struct net_device *dev)
> +void dev_set_forwarding(struct net_device *dev, int inc)
>  {
>  	/*
> -	 * If we're trying to disable lro on a vlan device
> +	 * If we're trying to enable forwarding from a vlan device
>  	 * use the underlying physical device instead
>  	 */
>  	if (is_vlan_dev(dev))
>  		dev = vlan_dev_real_dev(dev);
>  
> -	dev->wanted_features &= ~NETIF_F_LRO;
> +	dev->forwarding_count += inc;
> +	if (dev->forwarding_count)
> +		dev->wanted_features &= ~NETIF_F_LRO;
> +	else
> +		dev->wanted_features |= NETIF_F_LRO;
>  	netdev_update_features(dev);
[...]

We should not change dev->wanted_features any more.  It should only be
set as requested by userland.

Instead, netdev_update_features() should mask out NETIF_F_LRO based on
dev->forwarding_count.

Ben.

-- 
Ben Hutchings, Staff 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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