linux-kernel - RE: [PATCH 0/2] nvme: Add kernel API for admin command

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Date:   Mon, 16 Sep 2019 07:16:52 +0000
From:   "Baldyga, Robert" <robert.baldyga@...el.com>
To:     Christoph Hellwig <hch@....de>
CC:     "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Rakowski, Michal" <michal.rakowski@...el.com>
Subject: RE: [PATCH 0/2] nvme: Add kernel API for admin command

On Fri, Sep 13, 2019 at 04:37:09PM +0200, Christoph Hellwig wrote:
> On Fri, Sep 13, 2019 at 01:16:08PM +0200, Robert Baldyga wrote:
> > Hello,
> > 
> > This patchset adds two functions providing kernel to kernel API 
> > for submiting NVMe admin commands. This is for use of NVMe-aware
> > block device drivers stacking on top of NVMe drives. An example of
> > such driver is Open CAS Linux [1] which uses NVMe extended LBA 
> > formats and thus needs to issue commands like nvme_admin_identify.
> 
> We never add functionality for out of tree crap.  And this shit really
> is a bunch of crap, so it is unlikely to ever be merged. 

So that modules which are by design out of tree have to hack around
lack of API allowing to use functionality implemented by driver.
Don't you think that this is what actually produces crap?

> Why can't intel sometimes actually do something useful for a change
> instead of piling junk over junk?

Proposed API is equally useful for both in tree and out of tree modules,
so I find your comment unrelated.

If you don't like the way it's done, we can look for alternatives.
The point is to allow other drivers use NVMe admin commands, which is
currently not possible as neither the block layer nor the nvme driver
provides sufficient API.

Best regards,
Robert Baldyga
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