netdev - Re: Manual loading of mlx4

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Date:	Wed, 30 Jul 2014 10:56:23 +0300
From:	Amir Vadai <amirv@...lanox.com>
To:	Benjamin Poirier <benjamin.poirier@...il.com>
CC:	Jean Delvare <jdelvare@...e.de>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	"Jack Morgenstein" <jackm@....mellanox.co.il>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Manual loading of mlx4_en

On 7/30/2014 5:14 AM, Benjamin Poirier wrote:
> On 2014/07/29 16:42, Amir Vadai wrote:
>> On 7/29/2014 3:06 PM, Jean Delvare wrote:
>>> Le Tuesday 29 July 2014 à 13:44 +0300, Amir Vadai a écrit :
>>>> On 7/29/2014 1:34 PM, Jean Delvare wrote:
>>>>> Many thanks for the fast and detailed answer! I'll go backport this
>>>>> commit to kernel 3.12 (and 3.0, hopefully it doesn't have too many
>>>>> dependencies?)
>>>>
>>>> I don't think there is any dependency for that commit. If you're
>>>> backporting it, also take a small fix to it:
>>>> f24f790 net/mlx4_core: Load the Eth driver first
>>>
>>> Thanks for the hint. I suppose I should pick 7855bff4 "net/mlx4_core:
>>> Load the IB driver when the device supports IBoE" as well?
>>>
>> Right - missed it.
> 
> Thanks for the pointers.
> Looking at f24f790f, I'm wondering if request_module(EN_DRV_NAME) ought
> to be used instead of _nowait to guarantee the desired effect. Suppose
> for example that the process is migrated to a different cpu between the
> two request_module calls, the second one could complete before the first
> one no?
> 

The issue was addressed after the commit above, through these two
commits in a proper and robust way:
9433c18 IB/mlx4: Invoke UPDATE_QP for proxy QP1 on MAC changes
ce8d9e0 net/mlx4_core: Add UPDATE_QP SRIOV wrapper support

Thanks,
Amir
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