netdev - Re: [PATCH] net: Add DEVTYPE support for Ethernet based devices

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Date:	Sat, 05 Sep 2009 02:17:26 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, shemminger@...ux-foundation.org,
	johannes@...solutions.net
Subject: Re: [PATCH] net: Add DEVTYPE support for Ethernet based devices

Hi Dave,

> The Ethernet framing is used for a lot of devices these days. Most
> prominent are WiFi and WiMAX based devices. However for userspace
> application it is important to classify these devices correctly and
> not only see them as Ethernet devices. The daemons like HAL, DeviceKit
> or even NetworkManager with udev support tries to do the classification
> in userspace with a lot trickery and extra system calls. This is not
> good and actually reaches its limitations. Especially since the kernel
> does know the type of the Ethernet device it is pretty stupid.
> 
> To solve this problem the underlying device type needs to be set and
> then the value will be exported as DEVTYPE via uevents and available
> within udev.
> 
>   # cat /sys/class/net/wlan0/uevent
>   DEVTYPE=wlan
>   INTERFACE=wlan0
>   IFINDEX=5
> 
> This is similar to subsystems like USB and SCSI that distinguish
> between hosts, devices, disks, partitions etc.
> 
> The new SET_NETDEV_DEVTYPE() is a convenience helper to set the actual
> device type. All device types are free form, but for convenience the
> same strings as used with RFKILL are choosen.

can you please give me some feedback on this patch.

Regards

Marcel


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