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 20:17:44 -0400
From:   Hal Rosenstock <hal@....mellanox.co.il>
To:     Ghazale Hosseinabadi <ghazale.hosseinabadi@...cle.com>
Cc:     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 7:19 PM, Hal Rosenstock wrote:
> 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.

[off list...]
Are you using libibumad or rdma-core package ? Which version ?
What version of infiniband-diags are you using ?
Can you build from sources ?
I have patch to libibumad/rdma-core and another patch to ibstat
(infiniband-diags) which I'd like you to try. Is that possible ?

Thanks.

-- Hal

> 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.
>>>
>>
>>