linux-kernel - Re: [PATCH v9 13/13] nvmet: Optionally use PCI P2P memory

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Message-ID: <298e6e20-c8b6-de4b-46f5-94d1d3e2445c@deltatee.com>
Date:   Fri, 5 Oct 2018 09:42:05 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Sagi Grimberg <sagi@...mberg.me>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-rdma@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-block@...r.kernel.org, Stephen Bates <sbates@...thlin.com>,
        Keith Busch <keith.busch@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>,
        Jens Axboe <axboe@...nel.dk>,
        Steve Wise <swise@...ngridcomputing.com>
Subject: Re: [PATCH v9 13/13] nvmet: Optionally use PCI P2P memory



On 2018-10-05 1:07 a.m., Christoph Hellwig wrote:
> On Thu, Oct 04, 2018 at 04:29:19PM -0600, Logan Gunthorpe wrote:
>>> 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.

Ok, if I do a v10 I'll add it but I don't have anything else queued up
at the moment.


>> 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.

Agreed.

Thanks for the review!

Logan