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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <yq1h85986fu.fsf@oracle.com>
Date:   Wed, 18 Sep 2019 20:40:05 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Keith Busch <kbusch@...nel.org>,
        "sagi\@grimberg.me" <sagi@...mberg.me>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme\@lists.infradead.org" <linux-nvme@...ts.infradead.org>,
        "Rakowski\, Michal" <michal.rakowski@...el.com>,
        "axboe\@fb.com" <axboe@...com>,
        "Baldyga\, Robert" <robert.baldyga@...el.com>
Subject: Re: [PATCH 0/2] nvme: Add kernel API for admin command


Christoph,

> 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.

Yep. There's a reason we did DIX...

-- 
Martin K. Petersen	Oracle Linux Engineering