netdev - Re: [PATCH] mlx4_en: show device's port used

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Message-ID: <20100525101206.5451346c@nehalam>
Date:	Tue, 25 May 2010 10:12:06 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Eli Cohen <eli@...lanox.co.il>, davem@...emloft.net,
	netdev@...r.kernel.org,
	Linux RDMA list <linux-rdma@...r.kernel.org>,
	yevgenyp@...lanox.co.il
Subject: Re: [PATCH] mlx4_en: show device's port used

On Tue, 25 May 2010 09:55:47 -0700
Roland Dreier <rdreier@...co.com> wrote:

>  > Add a sysfs file under /sys/class/net/<ethx> to show the port number within the
>  > device that this network interface is using. This is needed as ConnectX devices
>  > have two ports and it is useful to know which port the ethernet devices uses.
> 
> How do other multi-port ethernet devices handle this?  Seems that the
> cleanest way to handle this would be to add a place for drivers to set
> the port number, and export it to userspace in generic code (so everyone
> does it the same way).

There is a rarely used field in net_device called dev_id
that looks like it was intended for this.


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