netdev - Re: [PATCH net-next 1/2] net: provide a default dev->ethtool

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Date:	Sat, 15 Sep 2012 14:40:47 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: Re: [PATCH net-next 1/2] net: provide a default dev->ethtool_ops

On Fri, 2012-09-14 at 09:24 +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> Instead of forcing device drivers to provide empty ethtool_ops or tweak
> net/core/ethtool.c again, we could provide a generic ethtool_ops.
> 
> This occurred to me when I wanted to add GSO support to GRE tunnels.
> ethtool -k support should be generic for all drivers.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Maciej Żenczykowski <maze@...gle.com>

Yes, I should have done this ages ago.  Just some nit-picking below:

[...]
> diff --git a/net/core/dev.c b/net/core/dev.c
> index b1e6d63..ff8dcfc 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -6045,6 +6045,11 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
>  
>  	strcpy(dev->name, name);
>  	dev->group = INIT_NETDEV_GROUP;
> +	if (!dev->ethtool_ops) {
> +		static const struct ethtool_ops default_ethtool_ops;
> +
> +		dev->ethtool_ops = &default_ethtool_ops;
> +	}

This block has a blank line in it, so I think it needs a blank line
either side to make the visual grouping of code right.  Alternately you
could pull the variable out of the block.

[...] 
> @@ -1410,8 +1409,9 @@ static int ethtool_get_module_eeprom(struct net_device *dev,
>  				      modinfo.eeprom_len);
>  }
>  
> -/* The main entry point in this file.  Called from net/core/dev.c */
> -
> +/* The main entry point in this file.  Called from net/core/dev.c
> + * with RTNL held.
> + */

Good point but an unrelated change.

>  int dev_ethtool(struct net *net, struct ifreq *ifr)
>  {
>  	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
> @@ -1419,25 +1419,15 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
>  	u32 ethcmd;
>  	int rc;
>  	u32 old_features;
> +	const struct ethtool_ops *ops;
>  
>  	if (!dev || !netif_device_present(dev))
>  		return -ENODEV;
>  
> +	ops = dev->ethtool_ops;
[...]

Introducing this local variable is a useful cleanup but again should be
a separate change.

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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