Re: [PATCH v3 21/21] nvme-fc: Extend FENCING state per TP4129 on CCR failure

[Mohamed Khalfella <mkhalfella@purestorage.com>]

On Fri 2026-02-27 17:20:45 -0800, James Smart wrote:
> On 2/13/2026 8:25 PM, Mohamed Khalfella wrote:
> > If CCR operations fail and CQT is supported, we must defer the retry of
> > inflight requests per TP4129. Update ctrl->fencing_work to schedule
> > ctrl->fenced_work, effectively extending the FENCING state. This delay
> > ensures that inflight requests are held until it is safe for them to be
> > retired.
> > 
> > Signed-off-by: Mohamed Khalfella <mkhalfella@purestorage.com>
> > ---
> >   drivers/nvme/host/fc.c | 39 +++++++++++++++++++++++++++++++++++----
> >   1 file changed, 35 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> > index eac3a7ccaa5c..81088a4ce298 100644
> > --- a/drivers/nvme/host/fc.c
> > +++ b/drivers/nvme/host/fc.c
> > @@ -167,6 +167,7 @@ struct nvme_fc_ctrl {
> >   	struct blk_mq_tag_set	tag_set;
> >   
> >   	struct work_struct	fencing_work;
> > +	struct delayed_work	fenced_work;
> >   	struct work_struct	ioerr_work;
> >   	struct delayed_work	connect_work;
> >   
> > @@ -1878,6 +1879,18 @@ __nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl,
> >   	return ret;
> >   }
> >   
> > +static void nvme_fc_fenced_work(struct work_struct *work)
> > +{
> > +	struct nvme_fc_ctrl *fc_ctrl = container_of(to_delayed_work(work),
> > +					struct nvme_fc_ctrl, fenced_work);
> > +	struct nvme_ctrl *ctrl = &fc_ctrl->ctrl;
> > +
> > +	dev_info(ctrl->device, "Time-based recovery finished\n");
> > +	nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED);
> > +	if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
> > +		queue_work(nvme_reset_wq, &fc_ctrl->ioerr_work);
> 
> sync with comments on patch 12

I will do that. It has been suggested to move CQT changes into a
separate patchset and focus on CCR changes for now. I will drop
patches [16 - 21] from this patchset to be re-introduced later.

> 
> > +}
> > +
> >   static void nvme_fc_fencing_work(struct work_struct *work)
> >   {
> >   	struct nvme_fc_ctrl *fc_ctrl =
> > @@ -1886,16 +1899,33 @@ static void nvme_fc_fencing_work(struct work_struct *work)
> >   	unsigned long rem;
> >   
> >   	rem = nvme_fence_ctrl(ctrl);
> > -	if (rem) {
> > +	if (!rem)
> > +		goto done;
> > +
> > +	if (!ctrl->cqt) {
> >   		dev_info(ctrl->device,
> > -			 "CCR failed, skipping time-based recovery\n");
> > +			 "CCR failed, CQT not supported, skip time-based recovery\n");
> > +		goto done;
> >   	}
> >   
> > +	dev_info(ctrl->device,
> > +		 "CCR failed, switch to time-based recovery, timeout = %ums\n",
> > +		 jiffies_to_msecs(rem));
> > +	queue_delayed_work(nvme_wq, &fc_ctrl->fenced_work, rem);
> > +	return;
> > +
> > +done:
> >   	nvme_change_ctrl_state(ctrl, NVME_CTRL_FENCED);
> >   	if (nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
> >   		queue_work(nvme_reset_wq, &fc_ctrl->ioerr_work);
> >   }
> >   
> > +static void nvme_fc_flush_fencing_works(struct nvme_fc_ctrl *ctrl)
> > +{
> > +	flush_work(&ctrl->fencing_work);
> > +	flush_delayed_work(&ctrl->fenced_work);
> > +}
> > +
> >   static void
> >   nvme_fc_ctrl_ioerr_work(struct work_struct *work)
> >   {
> > @@ -1917,7 +1947,7 @@ nvme_fc_ctrl_ioerr_work(struct work_struct *work)
> >   		return;
> >   	}
> >   
> > -	flush_work(&ctrl->fencing_work);
> > +	nvme_fc_flush_fencing_works(ctrl);
> >   	nvme_fc_error_recovery(ctrl);
> >   }
> >   
> > @@ -3396,7 +3426,7 @@ nvme_fc_reset_ctrl_work(struct work_struct *work)
> >   	struct nvme_fc_ctrl *ctrl =
> >   		container_of(work, struct nvme_fc_ctrl, ctrl.reset_work);
> >   
> > -	flush_work(&ctrl->fencing_work);
> > +	nvme_fc_flush_fencing_works(ctrl);
> >   	nvme_stop_ctrl(&ctrl->ctrl);
> >   
> >   	/* will block will waiting for io to terminate */
> > @@ -3573,6 +3603,7 @@ nvme_fc_alloc_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
> >   	INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work);
> >   	INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work);
> >   	INIT_WORK(&ctrl->fencing_work, nvme_fc_fencing_work);
> > +	INIT_DELAYED_WORK(&ctrl->fenced_work, nvme_fc_fenced_work);
> >   	INIT_WORK(&ctrl->ioerr_work, nvme_fc_ctrl_ioerr_work);
> >   	spin_lock_init(&ctrl->lock);
> >   
> 
> looks ok.
> 
> Signed-off-by: James Smart <jsmart833426@gmail.com>
> 
> -- james
>