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

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Date:   Mon, 20 Jul 2020 15:41:24 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v15 7/9] nvmet-passthru: Add passthru code to process
 commands

Thanks for the review Christoph. I think I should be able to make all
the requested changes in the next week or two.

On 2020-07-20 1:35 p.m., Sagi Grimberg wrote:
> 
>> I'm still not so happy about having to look up the namespace and still
>> wonder if we should generalize the connect_q to a passthrough_q.  But
>> I guess we can do that later and then reduce some of the exports here..
> 
> That is a neat idea! should be easy to do (and we can then lose the host
> xarray stuff). I don't mind having it on a later patch, but it should be
> easy enough to do even before...
> 

I sort of follow this. I can try to work something up but it will
probably take me a few iterations to get it to where you want it. So,
roughly, we'd create a passthrough_q in core with the controller's IO
tagset and then cleanup the fabrics hosts to use that instead of each
independently creating their connect_q?

Though, I don't understand how this relates to the host xarray stuff
that Sagi mentioned...

Logan