netdev - Re: [patch net-next-2.6] dummy: allow report link status and change it via sysfs

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Date:	Fri, 29 Jul 2011 18:03:09 +0200
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, eric.dumazet@...il.com
Subject: Re: [patch net-next-2.6] dummy: allow report link status and
 change it via sysfs

On Fri, 2011-07-29 at 17:27 +0200, Jiri Pirko wrote:
> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
> ---
>  drivers/net/dummy.c |   54 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 54 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
> index 39cf9b9..fc39c24 100644
> --- a/drivers/net/dummy.c
> +++ b/drivers/net/dummy.c
> @@ -37,9 +37,57 @@
>  #include <linux/rtnetlink.h>
>  #include <net/rtnetlink.h>
>  #include <linux/u64_stats_sync.h>
> +#include <linux/ethtool.h>
>  
>  static int numdummies = 1;
>  
> +static ssize_t dummy_show_link(struct device *d,
> +			       struct device_attribute *attr,
> +			       char *buf)
> +{
> +	struct net_device *dev = to_net_dev(d);
> +
> +	return sprintf(buf, "%d\n", netif_carrier_ok(dev) ? 1 : 0);
> +}
[...]

Net devices already have the 'carrier' attribute.  You should make that
attribute writable for dummy devices, rather than adding another one.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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