linux-kernel - Re: [PATCH v2 05/14] nvmet: Send an AEN on CCR completion

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Message-ID: <20260203184802.GC3729-mkhalfella@purestorage.com>
Date: Tue, 3 Feb 2026 10:48:02 -0800
From: Mohamed Khalfella <mkhalfella@...estorage.com>
To: Hannes Reinecke <hare@...e.de>
Cc: 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>,
	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 05/14] nvmet: Send an AEN on CCR completion

On Tue 2026-02-03 04:27:39 +0100, Hannes Reinecke wrote:
> On 1/30/26 23:34, Mohamed Khalfella wrote:
> > Send an AEN to initiator when impacted controller exists. The
> > notification points to CCR log page that initiator can read to check
> > which CCR operation completed.
> > 
> > Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
> > ---
> >   drivers/nvme/target/core.c  | 25 ++++++++++++++++++++++---
> >   drivers/nvme/target/nvmet.h |  3 ++-
> >   include/linux/nvme.h        |  3 +++
> >   3 files changed, 27 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
> > index 54dd0dcfa12b..ae2fe9f90bcd 100644
> > --- a/drivers/nvme/target/core.c
> > +++ b/drivers/nvme/target/core.c
> > @@ -202,7 +202,7 @@ static void nvmet_async_event_work(struct work_struct *work)
> >   	nvmet_async_events_process(ctrl);
> >   }
> >   
> > -void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
> > +static void nvmet_add_async_event_locked(struct nvmet_ctrl *ctrl, u8 event_type,
> >   		u8 event_info, u8 log_page)
> >   {
> >   	struct nvmet_async_event *aen;
> > @@ -215,13 +215,19 @@ void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
> >   	aen->event_info = event_info;
> >   	aen->log_page = log_page;
> >   
> > -	mutex_lock(&ctrl->lock);
> >   	list_add_tail(&aen->entry, &ctrl->async_events);
> > -	mutex_unlock(&ctrl->lock);
> >   
> >   	queue_work(nvmet_wq, &ctrl->async_event_work);
> >   }
> >   
> > +void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
> > +		u8 event_info, u8 log_page)
> > +{
> > +	mutex_lock(&ctrl->lock);
> > +	nvmet_add_async_event_locked(ctrl, event_type, event_info, log_page);
> > +	mutex_unlock(&ctrl->lock);
> > +}
> > +
> >   static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
> >   {
> >   	u32 i;
> > @@ -1788,6 +1794,18 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args)
> >   }
> >   EXPORT_SYMBOL_GPL(nvmet_alloc_ctrl);
> >   
> > +static void nvmet_ctrl_notify_ccr(struct nvmet_ctrl *ctrl)
> > +{
> > +	lockdep_assert_held(&ctrl->lock);
> > +
> > +	if (nvmet_aen_bit_disabled(ctrl, NVME_AEN_BIT_CCR_COMPLETE))
> > +		return;
> > +
> > +	nvmet_add_async_event_locked(ctrl, NVME_AER_NOTICE,
> > +				     NVME_AER_NOTICE_CCR_COMPLETED,
> > +				     NVME_LOG_CCR);
> > +}
> > +
> >   static void nvmet_ctrl_complete_pending_ccr(struct nvmet_ctrl *ctrl)
> >   {
> >   	struct nvmet_subsys *subsys = ctrl->subsys;
> 
> But what does the CCR command actually _do_?
> At the very lease I would have expected it to trigger a controller reset
> (eg calling into nvmet_ctrl_fatal_error()), yet I don't see it doing
> that anywhere ...

[PATCH v2 03/14] nvmet: Implement CCR nvme command
is where impacted controller is told to fail. It does exactly what you
mentioned above.

+out_unlock:
+       mutex_unlock(&sctrl->lock);
+       if (status == NVME_SC_SUCCESS)
+               nvmet_ctrl_fatal_error(ictrl);
+       nvmet_ctrl_put(ictrl);
+out:
+       nvmet_req_complete(req, status);

I refactored the error handling codepath into success codepath. That is
why I think it is kind of hidden. If this is not obvious I can separate
the two codepaths. What do you think?