linux-kernel - Re: [PATCH] nvme: Use NN for max

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Message-ID: <f89bf79e-937c-96ba-4622-4a29fce00b0e@grimberg.me>
Date:   Fri, 21 May 2021 13:19:26 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Keith Busch <kbusch@...nel.org>, Daniel Wagner <dwagner@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] nvme: Use NN for max_namespaces if MNAN is zero


>> Forgot to mention: During testing dynamically adding namespaces it was
>> possible to trigger the WARNINGs in the nvme_parse_ana_log(). Initially
>> the subsystem started with 8 namespaces and during runtime another 8
>> namespaces was added.
> 
> The controller is required to have a non-zero MNAN value if it supports
> ANA:
> 
>    If the controller supports Asymmetric Namespace Access Reporting, then
>    this field shall be set to a non-zero value that is less than or equal
>    to the NN value.

That was my thought exactly