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

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Message-ID: <eda217b2572c94a1811ef8a1a0fe214a502b942e.camel@kernel.crashing.org>
Date:   Tue, 06 Aug 2019 15:26:38 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...com>,
        Keith Busch <keith.busch@...el.com>
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

On Mon, 2019-08-05 at 13:07 -0700, Sagi Grimberg wrote:
> > > > > > 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
> 
> Doesn't apply..
> 
> Ben, can you please respin a patch that applies on nvme-5.4?
> 
> http://git.infradead.org/nvme.git/shortlog/refs/heads/nvme-5.4

Sure, will do in the next couple of days !

Cheers,
Ben.