From: martin.petersen@oracle.com (Martin K. Petersen)
Subject: [RFC PATCH] nvme-pci: Bounce buffer for interleaved metadata
Date: Tue, 27 Feb 2018 22:46:32 -0500 [thread overview]
Message-ID: <yq1371l4vzb.fsf@oracle.com> (raw)
In-Reply-To: <5662c6d9-0c87-6074-12b8-39db53ce3c7f@grimberg.me> (Sagi Grimberg's message of "Sun, 25 Feb 2018 19:30:48 +0200")
Sagi,
> It makes sense for FC (and few RDMA devices) that already get
> interleaved metadata from the wire to keep it as is instead of
> scattering it if the backend nvme device supports interleaved mode...
Yeah, assuming that the PI doesn't have to get translated.
> I would say that this support for this is something that belongs in
> the block layer. IIRC mkp also expressed interest in using
> preadv2/pwritev2 to for user-space to use DIF with some accounting on
> the iovec
Indeed.
> so maybe we can add a flag for interleaved metadata.
What would the use case be for this? Userspace target driver? I know
lots of widgets that rely on interleaved but they are all using SPDK.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2018-02-28 3:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-24 0:05 [RFC PATCH] nvme-pci: Bounce buffer for interleaved metadata Keith Busch
2018-02-25 17:30 ` Sagi Grimberg
2018-02-26 16:49 ` Keith Busch
2018-02-28 3:46 ` Martin K. Petersen [this message]
2018-03-01 9:22 ` Sagi Grimberg
2018-02-28 3:42 ` Martin K. Petersen
2018-02-28 16:35 ` Keith Busch
2018-02-28 16:37 ` Christoph Hellwig
2018-02-28 19:54 ` Keith Busch
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