linux-kernel - Re: [PATCH v3] nvme-pci: Support shared tags across queues for Apple 2018 controllers

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Date:   Mon, 5 Aug 2019 12:56:29 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Jens Axboe <axboe@...com>, Keith Busch <keith.busch@...el.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     Damien Le Moal <Damien.LeMoal@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Pawlowski <paul@...rm.io>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v3] nvme-pci: Support shared tags across queues for Apple
 2018 controllers


>>>> Ping ? I had another look today and I don't feel like mucking around
>>>> with all the AQ size logic, AEN magic tag etc... just for that sake of
>>>> that Apple gunk. I'm happy to have it give up IO tags, it doesn't seem
>>>> to make much of a difference in practice anyway.
>>>>
>>>> But if you feel strongly about it, then I'll implement the "proper" way
>>>> sometimes this week, adding a way to shrink the AQ down to something
>>>> like 3 (one admin request, one async event (AEN), and the empty slot)
>>>> by making a bunch of the constants involved variables instead.
>>>
>>> I don't feel too strongly about it. I think your patch is fine, so
>>>
>>> Acked-by: Keith Busch <keith.busch@...el.com>
>>
>> Should we pick this up for 5.3-rc?
> 
> No, it's not a regression fix. Queue it up for 5.4 instead.

OK, will queue it up for nvme-5.4