linux-kernel - Re: [PATCH v2 11/14] nvme-rdma: Use CCR to recover controller that hits an error

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Message-ID: <fc21f807-91b8-4ef5-86a8-171932616567@suse.de>
Date: Tue, 3 Feb 2026 06:35:59 +0100
From: Hannes Reinecke <hare@...e.de>
To: Mohamed Khalfella <mkhalfella@...estorage.com>,
 Justin Tee <justin.tee@...adcom.com>,
 Naresh Gottumukkala <nareshgottumukkala83@...il.com>,
 Paul Ely <paul.ely@...adcom.com>, Chaitanya Kulkarni <kch@...dia.com>,
 Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
 Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>
Cc: Aaron Dailey <adailey@...estorage.com>,
 Randy Jennings <randyj@...estorage.com>,
 Dhaval Giani <dgiani@...estorage.com>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/14] nvme-rdma: Use CCR to recover controller that
 hits an error

On 1/30/26 23:34, Mohamed Khalfella wrote:
> An alive nvme controller that hits an error now will move to FENCING
> state instead of RESETTING state. ctrl->fencing_work attempts CCR to
> terminate inflight IOs. If CCR succeeds, switch to FENCED -> RESETTING
> and continue error recovery as usual. If CCR fails, the behavior depends
> on whether the subsystem supports CQT or not. If CQT is not supported
> then reset the controller immediately as if CCR succeeded in order to
> maintain the current behavior. If CQT is supported switch to time-based
> recovery. Schedule ctrl->fenced_work resets the controller when time
> based recovery finishes.
> 
> Either ctrl->err_work or ctrl->reset_work can run after a controller is
> fenced. Flush fencing work when either work run.
> 
> Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
> ---
>   drivers/nvme/host/rdma.c | 62 +++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 61 insertions(+), 1 deletion(-)
> 
The rdma driver is largely similar to the tcp one, so comments there
apply to both, one would guess.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich