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

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Date:   Mon, 20 Jul 2020 21:58:29 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Sagi Grimberg <sagi@...mberg.me>
CC:     Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...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

On 7/20/20 14:41, Logan Gunthorpe wrote:
>> 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...

I didn't understand it either how having a passthru q can get rid of the
struct nvme_ns search when nsid is embedded in the nvme_cmd in
the I/O path ?

Sagi can you please explain ?