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 17:36:09 -0700
From:   Ghazale Hosseinabadi <ghazale.hosseinabadi@...cle.com>
To:     Hal Rosenstock <hal@....mellanox.co.il>
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 04:19 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 ?
Yes, because a value is written in 
/sys/class/infiniband/mlx5_X/ports/1/rate
>   I must be missing something as to what is going
> on in this scenario.
Without this bug fix, file /sys/class/infiniband/mlx5_X/ports/1/rate is 
empty, which results in ibpanic.

-- Ghazale
>
> 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.
>>>
>>