linux-kernel - Re: [PATCH] IB/mlx5: give back valid speed/width even without plugged in SFP module

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Date:   Fri, 27 Oct 2017 17:30:26 -0400
From:   Hal Rosenstock <hal@....mellanox.co.il>
To:     Parav Pandit <parav@...lanox.com>,
        Thomas Bogendoerfer <tbogendoerfer@...e.de>,
        Matan Barak <matanb@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     Ghazale Hosseinabadi <ghazale.hosseinabadi@...cle.com>
Subject: Re: [PATCH] IB/mlx5: give back valid speed/width even without plugged
 in SFP module

On 10/27/2017 4:33 PM, Parav Pandit wrote:
> 
> 
>> -----Original Message-----
>> From: Hal Rosenstock [mailto:hal@....mellanox.co.il]
>> Sent: Friday, October 27, 2017 3:19 PM
>> To: Parav Pandit <parav@...lanox.com>; Thomas Bogendoerfer
>> <tbogendoerfer@...e.de>; Matan Barak <matanb@...lanox.com>; Leon
>> Romanovsky <leonro@...lanox.com>; Doug Ledford <dledford@...hat.com>;
>> linux-rdma@...r.kernel.org; linux-kernel@...r.kernel.org
>> Cc: Ghazale Hosseinabadi <ghazale.hosseinabadi@...cle.com>
>> Subject: Re: [PATCH] IB/mlx5: give back valid speed/width even without plugged
>> in SFP module
>>
>> On 10/27/2017 2:32 PM, Parav Pandit wrote:
>>> However I believe that ibstat tool should be enhanced to report unknown port
>> speed instead of expecting drivers to supply some random number like this.
>>
>> ibstat gets the rate from libibumad via /sys/class/infiniband/<IB
>> device>/ports/<port number>/rate file which is supposed to be populated by the
>> driver. Is there no rate file in this error case ?
>>
> <...>/<port_num>/rate file exist.
> 
> rate_show() has invalid active_width as expected due to nonexistence of SFP.
> So sysfs call return invalid value.
> We don't have invalid_active_width defined right now.
> So ibstat and other applications should not crash on such valid errors.

Agreed. I haven't seen ibstat crash reported though. Can someone provide
the crash details ?