From: Keith Busch <kbusch@kernel.org>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
Stephen Bates <sbates@raithlin.com>, Jens Axboe <axboe@fb.com>,
Max Gurtovoy <maxg@mellanox.com>,
Logan Gunthorpe <logang@deltatee.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v15 7/9] nvmet-passthru: Add passthru code to process commands
Date: Mon, 20 Jul 2020 17:06:30 -0700 [thread overview]
Message-ID: <20200721000630.GA682317@dhcp-10-100-145-180.wdl.wdc.com> (raw)
In-Reply-To: <d7596065-f33b-5533-7254-153b82e6b88b@grimberg.me>
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().
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next prev parent reply other threads:[~2020-07-21 0:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 20:33 [PATCH v15 0/9] nvmet: add target passthru commands support Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 1/9] nvme-core: Clear any SGL flags in passthru commands Logan Gunthorpe
2020-07-20 14:01 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 2/9] nvme: Create helper function to obtain command effects Logan Gunthorpe
2020-07-20 14:04 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 3/9] nvme: Move nvme_passthru_[start|end]() calls to common helper Logan Gunthorpe
2020-07-20 14:06 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 4/9] nvmet-passthru: Introduce NVMet passthru Kconfig option Logan Gunthorpe
2020-07-20 14:06 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 5/9] nvme-core: Introduce nvme_ctrl_get_by_path() Logan Gunthorpe
2020-07-20 14:09 ` Christoph Hellwig
2020-07-16 20:33 ` [PATCH v15 6/9] nvme: Export existing nvme core functions Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 7/9] nvmet-passthru: Add passthru code to process commands Logan Gunthorpe
2020-07-20 14:16 ` Christoph Hellwig
2020-07-20 19:35 ` Sagi Grimberg
2020-07-20 21:41 ` Logan Gunthorpe
2020-07-20 21:58 ` Chaitanya Kulkarni
2020-07-20 22:35 ` Sagi Grimberg
2020-07-20 23:01 ` Logan Gunthorpe
2020-07-20 23:15 ` Sagi Grimberg
2020-07-20 23:17 ` Keith Busch
2020-07-20 23:28 ` Sagi Grimberg
2020-07-21 0:06 ` Keith Busch [this message]
2020-07-21 0:39 ` Sagi Grimberg
2020-07-22 21:09 ` Logan Gunthorpe
2020-07-22 22:31 ` Sagi Grimberg
2020-07-16 20:33 ` [PATCH v15 8/9] nvmet-passthru: Add enable/disable helpers Logan Gunthorpe
2020-07-16 20:33 ` [PATCH v15 9/9] nvmet-configfs: Introduce passthru configfs interface Logan Gunthorpe
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