linux-kernel - Re: [PATCH v15 7/9] nvmet-passthru: Add passthru code to process commands

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Date:   Mon, 20 Jul 2020 17:06:30 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Stephen Bates <sbates@...thlin.com>, Jens Axboe <axboe@...com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v15 7/9] nvmet-passthru: Add passthru code to process
 commands

On Mon, Jul 20, 2020 at 04:28:26PM -0700, Sagi Grimberg wrote:
> On 7/20/20 4:17 PM, Keith Busch wrote:
> > On Mon, Jul 20, 2020 at 05:01:19PM -0600, Logan Gunthorpe wrote:
> > > On 2020-07-20 4:35 p.m., Sagi Grimberg wrote:
> > > 
> > > > passthru commands are in essence REQ_OP_DRV_IN/REQ_OP_DRV_OUT, which
> > > > means that the driver shouldn't need the ns at all. So if you have a
> > > > dedicated request queue (mapped to the I/O tagset), you don't need the
> > > > ns->queue and we can lose the ns lookup altogether.
> > 
> > We still need a request_queue to dispatch the command. I guess you could
> > make a generic one for the controller that isn't tied to a namespace,
> > but we lose the fair shared tag allocation.
> 
> What do you mean fair shared tag allocation?

See hctx_may_queue().