From: Christoph Hellwig <hch@lst.de>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: "Jens Axboe" <axboe@kernel.dk>,
"Alex Williamson" <alex.williamson@redhat.com>,
linux-nvdimm@lists.01.org, linux-rdma@vger.kernel.org,
linux-pci@vger.kernel.org,
"Steve Wise" <swise@opengridcomputing.com>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, "Jérôme Glisse" <jglisse@redhat.com>,
"Jason Gunthorpe" <jgg@mellanox.com>,
"Christian König" <christian.koenig@amd.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Max Gurtovoy" <maxg@mellanox.com>,
"Christoph Hellwig" <hch@lst.de>
Subject: Re: [PATCH v9 13/13] nvmet: Optionally use PCI P2P memory
Date: Fri, 5 Oct 2018 09:07:20 +0200 [thread overview]
Message-ID: <20181005070720.GA23725@lst.de> (raw)
In-Reply-To: <2bcc0927-83ab-1bf2-d584-aebd5274cefa@deltatee.com>
On Thu, Oct 04, 2018 at 04:29:19PM -0600, Logan Gunthorpe wrote:
>
>
> On 2018-10-04 4:20 p.m., Sagi Grimberg wrote:
> >> +static inline struct device *nvmet_ns_dev(struct nvmet_ns *ns)
> >> +{
> >> + return disk_to_dev(ns->bdev->bd_disk);
> >> +}
> >
> > This needs to handle non bdev namespaces.
>
> As it's coded now the helper never gets called unless ns->bdev is not
> null. But in general, yes you are right, we should probably return NULL
> if ns->bdev is NULL.
I'd rather skip that for now.
> > index ef286b72d958..3d12f5f4568d 100644
> > --- a/drivers/nvme/target/fc.c
> > +++ b/drivers/nvme/target/fc.c
> > @@ -2280,6 +2280,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport
> > *tgtport,
> > fod->req.cmd = &fod->cmdiubuf.sqe;
> > fod->req.rsp = &fod->rspiubuf.cqe;
> > fod->req.port = tgtport->pe->port;
> > + fod->req.p2p_client = tgtport->dev;
> >
> > /* clear any response payload */
> > memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf));
> > --
>
> Sure, I guess that makes sense. I've never tried it with fc hardware but
> I assume there's no reason it wouldn't work.
>
> I'll queue these changes up for a v10.
And I'd wait until someone has actually tested this case.
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next prev parent reply other threads:[~2018-10-05 7:07 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-04 21:27 [PATCH v9 00/13] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 01/13] PCI/P2PDMA: Support peer-to-peer memory Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 02/13] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-10-05 7:08 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 03/13] PCI/P2PDMA: Add PCI p2pmem DMA mappings to adjust the bus offset Logan Gunthorpe
2018-10-05 7:08 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 04/13] PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers Logan Gunthorpe
2018-10-05 7:08 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 05/13] docs-rst: Add a new directory for PCI documentation Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 06/13] PCI/P2PDMA: Add P2P DMA driver writer's documentation Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 07/13] block: Add PCI P2P flag for request queue and check support for requests Logan Gunthorpe
2018-10-05 7:09 ` Christoph Hellwig
2018-10-06 1:16 ` Jens Axboe
2018-10-10 19:59 ` Bjorn Helgaas
2018-10-10 20:00 ` Jens Axboe
2018-10-04 21:27 ` [PATCH v9 08/13] IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-10-05 7:09 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 09/13] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-10-05 7:09 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 10/13] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 11/13] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-10-05 7:10 ` Christoph Hellwig
2018-10-05 15:39 ` Logan Gunthorpe
2018-10-04 21:27 ` [PATCH v9 12/13] nvmet: Introduce helper functions to allocate and free request SGLs Logan Gunthorpe
2018-10-05 7:11 ` Christoph Hellwig
2018-10-04 21:27 ` [PATCH v9 13/13] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-10-04 22:20 ` Sagi Grimberg
2018-10-04 22:29 ` Logan Gunthorpe
2018-10-05 7:07 ` Christoph Hellwig [this message]
2018-10-05 7:34 ` Sagi Grimberg
2018-10-05 15:42 ` Logan Gunthorpe
2018-10-10 20:19 ` [PATCH v9 00/13] Copy Offload in NVMe Fabrics with P2P PCI Memory Bjorn Helgaas
2018-10-10 23:03 ` Logan Gunthorpe
2018-10-11 3:18 ` Bjorn Helgaas
2018-10-11 15:38 ` Logan Gunthorpe
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