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

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Message-ID: <20190918170956.GA19639@lst.de>
Date:   Wed, 18 Sep 2019 19:09:56 +0200
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <kbusch@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        "Baldyga, Robert" <robert.baldyga@...el.com>,
        "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 Wed, Sep 18, 2019 at 11:08:07AM -0600, Keith Busch wrote:
> And yes, that bouncing is really nasty, but it's really only needed for
> PRP, so maybe let's just not ignore that transfer mode and support
> extended metadata iff the controller supports SGLs. We just need a
> special SGL setup routine to weave the data and metadata.

Well, what is the point?  If people really want to use metadata they
should just buy a drive supporting the separate metadata pointer.  In
fact I haven't had to deal with a drive that only supports interleaved
metadata so far given how awkward that is to deal with.  But based on
the discussions here it seems Intel is stupid enough to ship such a thing.