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 19:19:05 -0400
From:   Hal Rosenstock <hal@....mellanox.co.il>
To:     Ghazale Hosseinabadi <ghazale.hosseinabadi@...cle.com>
Cc:     linux-rdma@...r.kernel.org, tbogendoerfer@...e.de,
        matanb@...lanox.com, leonro@...lanox.com, parav@...lanox.com,
        linux-kernel@...r.kernel.org, dledford@...hat.com
Subject: Re: [PATCH] IB/mlx5: give back valid speed/width even without plugged
 in SFP module

On 10/27/2017 7:04 PM, Ghazale Hosseinabadi wrote:
> 
> 
> On 10/27/2017 03:52 PM, Hal Rosenstock wrote:
>> On 10/27/2017 5:54 PM, Ghazale Hosseinabadi wrote:
>>> When running ibstat (if transceiver is not connected in adapter):
>>>
>>> ibpanic: [7851] main: stat of IB device 'mlx5_1' failed: Invalid
>>> argument
>> Any output before that ?
> no, It only prints this line.

and setting the width to 1x in the driver so the rate file is properly
populated fixes this ? I must be missing something as to what is going
on in this scenario.

sysfs.c:rate_show is inconsistent as it paves over an invalid speed
setting that to SDR but does not pave over invalid width returning
-EINVAL but this comment is in another "direction".

-- Hal

> 
> -- Ghazale
>>   I'm trying to understand how far it gets. It
>> looks to me that empty rate file would be parsed as 0 and ibstat would
>> show that rate. ibpanic would occur if file was not found but I could be
>> missing something.
>>
> 
>