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Date:   Fri, 23 Jul 2021 08:08:06 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Wedson Almeida Filho <wedsonaf@...gle.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Finn Behrens <finn@...enk.dev>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        rust-for-linux <rust-for-linux@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] Rust support

On Thu, Jul 22, 2021 at 11:55:58PM +0100, Wedson Almeida Filho wrote:
> On Thu, Jul 08, 2021 at 01:58:32AM +0100, Matthew Wilcox wrote:
> > A simple NVMe driver is less than a thousand lines of C.
> > I know the one in the kernel now is ridiculously complicated and has
> > been thoroughly messed up with abstractions to support NVMeoF instead
> > of having a separate driver, but it's really a simple interface at heart.
> 
> The latest NVMe spec is 452 pages long, which seems to contradict your claim
> that it's simple. In any case, translating less than 1K lines of C shouldn't be
> too hard (after I've built the abstractions, of course). Would you mind sharing
> the simple driver you mention above?

You can use the 1.0 spec, which is much shorter. A 1.0 capable driver
should be forward compatible with newer devices, too.

The current nvme driver became less simple since blk-mq integration and
has only gotten more complicated since then with other transports and
more advanced features. For a simpler example, you can reference an in
kernel version <= 3.16, and ignore the "nvme-scsi" parts.

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