linux-kernel - Re: [PATCH 1/2] lightnvm: add generic ocssd detection

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Message-ID: <20170227185016.GC5789@localhost.localdomain>
Date:   Mon, 27 Feb 2017 13:50:17 -0500
From:   Keith Busch <keith.busch@...el.com>
To:     Sagi Grimberg <sagi@...mberg.me>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Matias Bjørling <matias@...xlabs.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH 1/2] lightnvm: add generic ocssd detection

On Mon, Feb 27, 2017 at 08:35:06PM +0200, Sagi Grimberg wrote:
> > On Sat, Feb 25, 2017 at 08:16:04PM +0100, Matias Bjørling wrote:
> > > On 02/25/2017 07:21 PM, Christoph Hellwig wrote:
> > > > No way in hell.  vs is vendor specific and we absolutely can't overload
> > > > it with any sort of meaning.  Get OCSSD support properly standardized and
> > > > add a class code for it.  Until then it's individual PCI IDs.
> > > > 
> > > 
> > > You are right, that is the right way to go, and we are working on it. In the
> > > meantime, there are a couple of reasons I want to do a pragmatic solution:
> > 
> > Reasonable reaosons, but that's just not how standard interfaces work.
> > Either you standardize the behaviour and have a standardized trigger
> > for it, or it is vendor specific and needs to be keyed off a specific
> > vendor/device identification.
> 
> I agree, I don't see how we're allowed to use vs for that.

>From personal experience, some OEMs will put whatever they want in the
VS region for their rebranded device, making it an unreliable place to
check for a capability.