linux-kernel - Re: [PATCH] net: set default DEVTYPE for all ethernet based devices

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Message-Id: <20140130.162841.525938031146003411.davem@davemloft.net>
Date:	Thu, 30 Jan 2014 16:28:41 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	teg@...m.no
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stephen@...workplumber.org, avi.kp.137@...il.com,
	mchehab@...hat.com, horms@...ge.net.au, marcel@...tmann.org,
	gregkh@...uxfoundation.org, kay@...y.org
Subject: Re: [PATCH] net: set default DEVTYPE for all ethernet based devices

From: Tom Gundersen <teg@...m.no>
Date: Thu, 30 Jan 2014 14:20:02 +0100

> In systemd's networkd and udevd, we would like to give the administrator a
> simple way to filter net devices by their DEVTYPE [0][1]. Other software
> such as ConnMan and NetworkManager uses a similar filtering already.
> 
> Currently, plain ethernet devices have DEVTYPE=(null). This patch sets the
> devtype to "ethernet" instead. This avoids the need for special-casing the
> DEVTYPE=(null) case in userspace, and also avoids false positives, as there
> are several other types of netdevs that also have DEVTYPE=(null).
> 
> Notice that this is done, as suggested by Marcel, in alloc_etherdev_mqs(),
> and as best I can tell it will not give any false positives. I considered
> doing it in ether_setup() instead as that seemed more intuitive, but that
> would give a lot of false positives indeed.
> 
> [0]: <http://www.freedesktop.org/software/systemd/man/systemd-networkd.service.html#Type>
> [1]: <http://www.freedesktop.org/software/systemd/man/udev.html#Type>
> 
> Signed-off-by: Tom Gundersen <teg@...m.no>

Assuming that all users of alloc_etherdev*() are ethernet devices is
really not going to work.
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