linux-kernel - [PATCH RFC 0/3] nvme: add support for command quiesce timeout

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Message-Id: <20250324-tp4129-v1-0-95a747b4c33b@kernel.org>
Date: Mon, 24 Mar 2025 13:07:55 +0100
From: Daniel Wagner <wagi@...nel.org>
To: Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
 Keith Busch <kbusch@...nel.org>, Hannes Reinecke <hare@...e.de>, 
 John Meneghini <jmeneghi@...hat.com>, randyj@...estorage.com, 
 Mohamed Khalfella <mkhalfella@...estorage.com>
Cc: linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Daniel Wagner <wagi@...nel.org>
Subject: [PATCH RFC 0/3] nvme: add support for command quiesce timeout

This is thought just as discussion input for the KATO session during
LSFMM.

The last patch is the interesting part. When commands is failed over to
the next path, it delays the requeuing on ctrl level. The implemention is
on purpose not implementing all the details. Just the very basics so it's
easy to understand what the main idea is.

Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
Daniel Wagner (3):
      nvmet: add command quiesce time
      nvme: store cqt value into nvme ctrl object
      nvme: delay failover by command quiesce timeout

 drivers/nvme/host/core.c        | 20 ++++++++++++++++
 drivers/nvme/host/fc.c          |  4 ++++
 drivers/nvme/host/multipath.c   | 52 ++++++++++++++++++++++++++++++++++++++---
 drivers/nvme/host/nvme.h        | 16 +++++++++++++
 drivers/nvme/host/rdma.c        |  2 ++
 drivers/nvme/host/tcp.c         |  1 +
 drivers/nvme/target/admin-cmd.c |  6 +++++
 drivers/nvme/target/nvmet.h     |  1 +
 include/linux/nvme.h            |  4 +++-
 9 files changed, 102 insertions(+), 4 deletions(-)
---
base-commit: 25462bccac81486c2fff0fa4b4c2b1e56751b8de
change-id: 20241128-tp4129-a45b998b20cb

Best regards,
-- 
Daniel Wagner <wagi@...nel.org>