netdev - Re: [patch net-next 1/4] net: introduce new priv_flag indicating iface capable of change mac when running

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Date:	Thu, 28 Jun 2012 23:17:34 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<rusty@...tcorp.com.au>, <mst@...hat.com>,
	<virtualization@...ts.linux-foundation.org>, <edumazet@...gle.com>,
	<danny.kukawka@...ect.de>, <shimoda.hiroaki@...il.com>
Subject: Re: [patch net-next 1/4] net: introduce new priv_flag indicating
 iface capable of change mac when running

On Thu, 2012-06-28 at 16:10 +0200, Jiri Pirko wrote:
> Introduce IFF_LIFE_ADDR_CHANGE priv_flag and use it to disable
> netif_running() check in eth_mac_addr()
>
> Signed-off-by: Jiri Pirko <jpirko@...hat.com>
> ---
>  include/linux/if.h |    2 ++
>  net/ethernet/eth.c |    2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/if.h b/include/linux/if.h
> index f995c66..fd9ee7c 100644
> --- a/include/linux/if.h
> +++ b/include/linux/if.h
> @@ -81,6 +81,8 @@
>  #define IFF_UNICAST_FLT	0x20000		/* Supports unicast filtering	*/
>  #define IFF_TEAM_PORT	0x40000		/* device used as team port */
>  #define IFF_SUPP_NOFCS	0x80000		/* device supports sending custom FCS */
> +#define IFF_LIFE_ADDR_CHANGE 0x100000	/* device supports hardware address
> +					 * change when it's running */
[...]

Any device that has IFF_UNICAST_FLT can update the unicast MAC filter
while it's running; doesn't that go hand-in-hand with being able to
handle changes to the primary MAC address?  Is the new flag really
necessary at all?

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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