linux-kernel - Re: [PATCH v3 1/1] nvme: multipath: Implemented new iopolicy "queue-depth"

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Message-ID: <073ae18a-a80e-4a95-a093-36210a3bb230@grimberg.me>
Date: Tue, 21 May 2024 13:15:33 +0300
From: Sagi Grimberg <sagi@...mberg.me>
To: Nilay Shroff <nilay@...ux.ibm.com>, John Meneghini <jmeneghi@...hat.com>,
 kbusch@...nel.org, hch@....de, emilne@...hat.com
Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
 jrani@...estorage.com, randyj@...estorage.com, hare@...nel.org
Subject: Re: [PATCH v3 1/1] nvme: multipath: Implemented new iopolicy
 "queue-depth"



On 21/05/2024 13:11, Sagi Grimberg wrote:
>
>>> Don't think this matters because cancellation only happens when we
>>> teardown the controller anyways...
>>>
>> I think in case if we reset the nvme controller then we don't teardown
>> controller, isn't it? In this case we cancel all pending requests, and
>> later restart the controller.
>
> Exactly, nvme_mpath_init_ctrl resets the counter.

Except you're right, the counter reset needs to move to 
nvme_mpath_init_identify()
or some place that is called on every controller reset.