netdev - Re: [PATCH] e100: expose broadcast

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Date:	Mon, 26 Apr 2010 10:49:55 +0200
From:	Erwan Velu <erwanaliasr1@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, alexander.h.duyck@...el.com,
	peter.p.waskiewicz.jr@...el.com, john.ronciak@...el.com
Subject: Re: [PATCH] e100: expose broadcast_disabled as a module option

Agreed that will be a better implementation. Changes of IFF_BROADCAST
could play with this "broadcast_disabled" configuration switch to
increase the cpu efficiency.

 I'm not a kernel expert and I don't really figure how the changes of
the IFF_BROADCAST should be forwarded to the interfaces and how it can
be manipulated. I saw that ifconfig have a '-broadcast' option but
looks like none of my drivers are compatible with that.

Does any one you could help me understanding what should be the good way to
1- enabled/disabled IFF_BROADCAST for a given interface
2- populate this changes to the driver

Once I'll be able to have a proper patch using that, I'll post it
again to the list.

Cheers,
Erwan

2010/4/24 Stephen Hemminger <shemminger@...tta.com>:
> On Fri, 23 Apr 2010 23:03:59 +0200
[...]
> The point is that the driver can look at IFF_BROADCAST rather than having
> module parameter. Module parameters are device driver specific and should
> be avoid as much as possible in favor of general mechanism. This is a repeated
> problem where users and vendors make special hooks that only work with their
> driver, which makes life hard for other users and distribution providers.
>
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