netdev - Re: [PATCH 2/3] IB/ipoib: Stop using dev

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Message-ID: <d48633cb-a99a-50af-6e47-13b87008cddc@cogentembedded.com>
Date:   Wed, 29 Aug 2018 12:44:31 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Arseny Maslennikov <ar@...msu.ru>, linux-rdma@...r.kernel.org
Cc:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] IB/ipoib: Stop using dev_id to expose port numbers

Hello!

On 8/29/2018 12:01 AM, Arseny Maslennikov wrote:

> Some InfiniBand network devices have multiple ports on the same PCI
> function. Prior to this the kernel erroneously used the `dev_id' sysfs
> field of those network interfaces to convey the port number to userspace.
> 
> `dev_id' is currently reserved for distinguishing stacked ifaces
> (e.g: VLANs) with the same hardware address as their parent device.
> 
> Similar fixes to net/mlx4_en and many other drivers, which started
> exporting this information through `dev_id' before 3.15, were accepted
> into the kernel 4 years ago.
> See 76a066f2a2a0268b565459c417b59724b5a3197b, commit message:
> `net/mlx4_en: Expose port number through sysfs'.

    See commit 76a066f2a2a0 ("net/mlx4_en: Expose port number through sysfs").
> This commit is separated from the previous one since we may wish to
> preserve backwards compatibility with userspace being already dependent
> on `dev_id' being different.
> 
> Signed-off-by: Arseny Maslennikov <ar@...msu.ru>
[...]

MBR, Sergei