netdev - RE: [PATCH net] bnx2x: Improve reliability in case of nested PCI errors

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Message-ID: <BY1PR0701MB1208D5F1608E334906898A4A9D070@BY1PR0701MB1208.namprd07.prod.outlook.com>
Date:   Wed, 27 Dec 2017 06:24:57 +0000
From:   "Shaikh, Shahed" <Shahed.Shaikh@...ium.com>
To:     "Guilherme G. Piccoli" <gpiccoli@...ux.vnet.ibm.com>,
        "Elior, Ariel" <Ariel.Elior@...ium.com>,
        Dept-Eng Everest Linux L2 <Dept-EngEverestLinuxL2@...ium.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "gpiccoli@...tonmail.ch" <gpiccoli@...tonmail.ch>
Subject: RE: [PATCH net] bnx2x: Improve reliability in case of nested PCI
 errors

> -----Original Message-----
> From: Guilherme G. Piccoli [mailto:gpiccoli@...ux.vnet.ibm.com]
> Sent: Friday, December 22, 2017 8:32 PM
> To: Elior, Ariel <Ariel.Elior@...ium.com>; Dept-Eng Everest Linux L2 <Dept-
> EngEverestLinuxL2@...ium.com>
> Cc: netdev@...r.kernel.org; gpiccoli@...ux.vnet.ibm.com;
> gpiccoli@...tonmail.ch
> Subject: [PATCH net] bnx2x: Improve reliability in case of nested PCI errors
> 
> While in recovery process of PCI error (called EEH on PowerPC arch), another
> PCI transaction could be corrupted causing a situation of nested PCI errors. Also,
> this scenario could be reproduced with error injection mechanisms (for debug
> purposes).
> 
> We observe that in case of nested PCI errors, bnx2x might attempt to initialize
> its shmem and cause a kernel crash due to bad addresses read from MCP.
> Multiple different stack traces were observed depending on the point the second
> PCI error happens.
> 
> This patch avoids the crashes by:
> 
>  * failing PCI recovery in case of nested errors (since multiple  PCI errors in a row
> are not expected to lead to a functional  adapter anyway), and by,
> 
>  * preventing access to adapter FW when MCP is failed (we mark it as  failed
> when shmem cannot get initialized properly).
> 
> Reported-by: Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@...ux.vnet.ibm.com>

Acked-by: Shahed Shaikh <Shahed.Shaikh@...ium.com>

Thanks,
Shahed