netdev - Re: [PATCH] net: implement dev_disable_lro() hw

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Date:	Fri, 18 Mar 2011 18:13:06 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] net: implement dev_disable_lro() hw_features
 compatibility

On Fri, 2011-03-18 at 18:42 +0100, Michał Mirosław wrote:
> Implement compatibility with new hw_features for dev_disable_lro().

Good point, but...

> This is a transition path - dev_disable_lro() should be later
> integrated into netdev_fix_features() after all drivers are converted.
>
> There's no point in exporting __ethtool_set_flags() as it and dev_disable_lro()
> are always built-in.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
> 
> Patch is build-tested only, as I don't have any LRO-capable hardware.
> It might be prettier to move dev_disable_lro() to ethtool.c.

It *looks* right.

>  net/core/dev.c     |   20 ++++++++++++--------
>  net/core/ethtool.c |    2 +-
>  2 files changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 0b88eba..105e082 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1353,14 +1353,18 @@ EXPORT_SYMBOL(dev_close);
>   */
>  void dev_disable_lro(struct net_device *dev)
>  {
> -	if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
> -	    dev->ethtool_ops->set_flags) {
> -		u32 flags = dev->ethtool_ops->get_flags(dev);
> -		if (flags & ETH_FLAG_LRO) {
> -			flags &= ~ETH_FLAG_LRO;
> -			dev->ethtool_ops->set_flags(dev, flags);
> -		}
> -	}
> +	extern int __ethtool_set_flags(struct net_device *, u32);
[...]

Local function declarations are a very bad idea, as they are not checked
against the function definition.  Please declare the function in
<linux/ethtool.h>; that does not oblige us to export it.

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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