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From: Kanchan Joshi <[email protected]>
To: [email protected], [email protected], [email protected], [email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected], [email protected],
	Kanchan Joshi <[email protected]>
Subject: [PATCH for-next 0/4] nvme-multipathing for uring-passthrough
Date: Mon, 11 Jul 2022 16:31:51 +0530	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: CGME20220711110753epcas5p4169b9e288d15ca35740dbb66a6f6983a@epcas5p4.samsung.com

nvme passthrough lacks multipathing capability and some of us have
already expressed interest to see this plumbed. Most recently during LSFMM,
around 2 months back.

This series wires up multipathing for uring-passthrough commands.
Attempt is not to affect the common path (i.e. when
requeue/failover does not trigger) with allocation or deferral. The
most important design bit is to treat "struct io_uring_cmd" in the same
way as "struct bio" is treated by the block-based nvme multipath.
Uring-commands are queued when path is not available, and resubmitted on
discovery of new path. Also if passthrough command on multipath-node is
failed, it is resubmitted on a different path.

Testing:
Using the upstream fio that support uring-passthrough:

fio -iodepth=16 -rw=randread -ioengine=io_uring_cmd -bs=4k -numjobs=4
-size=1G -iodepth_batch_submit=16 -group_reporting -cmd_type=nvme
-filename=/dev/ng0n1 -name=uring-pt

1. Multiple failover - every command is retried 1-5 times before completion
2. Fail nvme_find_path() - this tests completion post requeue
3. Combine above two
4. Repeat above but for passthrough commands which do not generate bio
(e.g. flush command)


Anuj Gupta (2):
  nvme: compact nvme_uring_cmd_pdu struct
  nvme-multipath: add multipathing for uring-passthrough commands

Kanchan Joshi (2):
  io_uring, nvme: rename a function
  io_uring: grow a field in struct io_uring_cmd

 drivers/nvme/host/ioctl.c     | 157 +++++++++++++++++++++++++++++-----
 drivers/nvme/host/multipath.c |  36 +++++++-
 drivers/nvme/host/nvme.h      |  26 ++++++
 include/linux/io_uring.h      |  44 +++++++++-
 io_uring/uring_cmd.c          |   4 +-
 5 files changed, 237 insertions(+), 30 deletions(-)

-- 
2.25.1


       reply	other threads:[~2022-07-11 11:28 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220711110753epcas5p4169b9e288d15ca35740dbb66a6f6983a@epcas5p4.samsung.com>
2022-07-11 11:01 ` Kanchan Joshi [this message]
     [not found]   ` <CGME20220711110800epcas5p3d338dd486fd778c5ba5bfe93a91ec8bd@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 1/4] io_uring, nvme: rename a function Kanchan Joshi
2022-07-14 13:55       ` Ming Lei
     [not found]   ` <CGME20220711110812epcas5p33aa90b23aa62fb11722aa8195754becf@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 2/4] nvme: compact nvme_uring_cmd_pdu struct Kanchan Joshi
2022-07-12  6:32       ` Christoph Hellwig
     [not found]   ` <CGME20220711110824epcas5p22c8e945cb8c3c3ac46c8c2b5ab55db9b@epcas5p2.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 3/4] io_uring: grow a field in struct io_uring_cmd Kanchan Joshi
2022-07-11 17:00       ` Sagi Grimberg
2022-07-11 17:19         ` Jens Axboe
2022-07-11 17:18       ` Jens Axboe
2022-07-11 17:55         ` Sagi Grimberg
2022-07-11 18:22           ` Sagi Grimberg
2022-07-11 18:24             ` Jens Axboe
2022-07-11 18:58               ` Sagi Grimberg
2022-07-12 11:40               ` Kanchan Joshi
2022-07-14  3:40             ` Ming Lei
2022-07-14  8:19               ` Kanchan Joshi
2022-07-14 15:30                 ` Daniel Wagner
2022-07-15 11:07                   ` Kanchan Joshi
2022-07-18  9:03                     ` Daniel Wagner
     [not found]   ` <CGME20220711110827epcas5p3fd81f142f55ca3048abc38a9ef0d0089@epcas5p3.samsung.com>
2022-07-11 11:01     ` [PATCH for-next 4/4] nvme-multipath: add multipathing for uring-passthrough commands Kanchan Joshi
2022-07-11 13:51       ` Sagi Grimberg
2022-07-11 15:12         ` Stefan Metzmacher
2022-07-11 16:58           ` Sagi Grimberg
2022-07-11 18:54           ` Kanchan Joshi
2022-07-11 18:37         ` Kanchan Joshi
2022-07-11 19:56           ` Sagi Grimberg
2022-07-12  4:23             ` Kanchan Joshi
2022-07-12 21:26               ` Sagi Grimberg
2022-07-13  5:37                 ` Kanchan Joshi
2022-07-13  9:03                   ` Sagi Grimberg
2022-07-13 11:28                     ` Kanchan Joshi
2022-07-13 12:17                       ` Sagi Grimberg
2022-07-14 15:14                   ` Ming Lei
2022-07-14 23:05                     ` Kanchan Joshi
2022-07-15  1:35                       ` Ming Lei
2022-07-15  1:46                         ` Ming Lei
2022-07-15  4:24                           ` Kanchan Joshi
2022-07-12  6:52       ` Christoph Hellwig
2022-07-12 11:33         ` Kanchan Joshi
2022-07-12 20:13         ` Sagi Grimberg
2022-07-13  5:36           ` Christoph Hellwig
2022-07-13  8:04             ` Sagi Grimberg
2022-07-13 10:12               ` Christoph Hellwig
2022-07-13 11:00                 ` Sagi Grimberg
2022-07-13 11:28                   ` Christoph Hellwig
2022-07-13 12:16                     ` Sagi Grimberg
2022-07-13 11:49                   ` Hannes Reinecke
2022-07-13 12:43                     ` Sagi Grimberg
2022-07-13 13:30                       ` Hannes Reinecke
2022-07-13 13:41                         ` Sagi Grimberg
2022-07-13 14:07                           ` Hannes Reinecke
2022-07-13 15:59                             ` Sagi Grimberg

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