netdev - Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to 4KB regardless of system page size"

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Message-ID: <56EA0B12.3070901@ozlabs.ru>
Date:	Thu, 17 Mar 2016 12:40:34 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Eli Cohen <eli@...lanox.com>, Huy Nguyen <huyn@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Carol L Soto <clsoto@...ibm.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Brian J King <bjking1@...ibm.com>
Subject: Re: [RFC PATCH kernel] Revert "net/mlx4_core: Set UAR page size to
 4KB regardless of system page size"

On 03/16/2016 08:45 PM, Or Gerlitz wrote:
> On Wed, Mar 16, 2016 at 10:34 AM, Alexey Kardashevskiy <aik@...abs.ru> wrote:
>
>> Oh. ok. It also looks like even with the reverted patch, mlx4 VF does not
>> work in a guest:
>
> So where is the breakage point for you? does 4.4 works? if not, what?

Ah, my bad. It is unrelated to the kernel version.

I tried passing a PF to a guest while its VFs are already passed to another 
guest and see how exactly it blows up (AER/EEH were thrown but the host 
recovered => good) but this left the device in a weird state when I could 
not use VF in a guest anymore but it seemed to keep working on the host.

It seems like the actual adapter does not reset completely when the machine 
is rebooted, I had unplug/replug power cables to fix this.


-- 
Alexey