netdev - Re: [PATCH V2 net] ibmvnic: Continue with reset if set link down failed

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Message-ID: <CAOhMmr5XayoXS=sJ+9zm68VF+Jn+9qiVvWUrDfq0WGQ6ftKdbw@mail.gmail.com>
Date:   Thu, 22 Apr 2021 00:30:52 -0500
From:   Lijun Pan <lijunp213@...il.com>
To:     Dany Madden <drt@...ux.ibm.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Sukadev Bhattiprolu <sukadev@...ux.ibm.com>,
        Thomas Falcon <tlfalcon@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V2 net] ibmvnic: Continue with reset if set link down failed

On Tue, Apr 20, 2021 at 4:37 PM Dany Madden <drt@...ux.ibm.com> wrote:
>
> When ibmvnic gets a FATAL error message from the vnicserver, it marks
> the Command Respond Queue (CRQ) inactive and resets the adapter. If this
> FATAL reset fails and a transmission timeout reset follows, the CRQ is
> still inactive, ibmvnic's attempt to set link down will also fail. If
> ibmvnic abandons the reset because of this failed set link down and this
> is the last reset in the workqueue, then this adapter will be left in an
> inoperable state.
>
> Instead, make the driver ignore this link down failure and continue to
> free and re-register CRQ so that the adapter has an opportunity to
> recover.
>
> Fixes: ed651a10875f ("ibmvnic: Updated reset handling")
> Signed-off-by: Dany Madden <drt@...ux.ibm.com>
> Reviewed-by: Rick Lindsley <ricklind@...ux.ibm.com>
> Reviewed-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>

One thing I would like to point out as already pointed out by Nathan Lynch is
that those review-by tags given by the same groups of people from the same
company loses credibility over time if you never critique or ask
questions on the list.