Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH v3] nvme-pci: Support shared tags across queues for Apple
 2018 controllers
To:     Keith Busch <keith.busch@intel.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc:     Damien Le Moal <Damien.LeMoal@wdc.com>,
        linux-kernel@vger.kernel.org, Paul Pawlowski <paul@mrarm.io>,
        Jens Axboe <axboe@fb.com>, Minwoo Im <minwoo.im.dev@gmail.com>,
        linux-nvme@lists.infradead.org, Keith Busch <kbusch@kernel.org>,
        Christoph Hellwig <hch@lst.de>
References: <b1f9bdf0294b8d87d292de3c7462c8e99551b02d.camel@kernel.crashing.org>
 <20190730153044.GA13948@localhost.localdomain>
 <2030a028664a9af9e96fffca3ab352faf1f739e5.camel@kernel.crashing.org>
 <6290507e1b2830b1729fc858cd5c20b85d092728.camel@kernel.crashing.org>
 <20190805134907.GC18647@localhost.localdomain>
From:   Sagi Grimberg <sagi@grimberg.me>
Message-ID: <40a6acc2-beae-3e36-ca20-af5801038a1e@grimberg.me>
Date:   Mon, 5 Aug 2019 11:27:54 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
MIME-Version: 1.0
In-Reply-To: <20190805134907.GC18647@localhost.localdomain>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


>> 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@intel.com>

Should we pick this up for 5.3-rc?