linux-kernel - Re: Re: [PATCH v2 2/5] nvme-fc: do not retry when auth fails or connection is refused

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Date: Wed, 21 Feb 2024 17:37:20 +0100
From: Daniel Wagner <dwagner@...e.de>
To: Hannes Reinecke <hare@...e.de>
Cc: James Smart <james.smart@...adcom.com>, 
	Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>, 
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v2 2/5] nvme-fc: do not retry when auth fails or
 connection is refused

On Wed, Feb 21, 2024 at 04:53:44PM +0100, Hannes Reinecke wrote:
> On 2/21/24 14:24, Daniel Wagner wrote:
> > There is no point in retrying to connect if the authentication fails.
> > 
> > Connection refused is also issued from the authentication path, thus
> > also do not retry.
> > 
> > Reviewed-by: Christoph Hellwig <hch@....de>
> > Signed-off-by: Daniel Wagner <dwagner@...e.de>
> > ---
> >   drivers/nvme/host/fc.c | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> > index a5b29e9ad342..b81046c9f171 100644
> > --- a/drivers/nvme/host/fc.c
> > +++ b/drivers/nvme/host/fc.c
> > @@ -3312,6 +3312,8 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status)
> >   			ctrl->cnum, status);
> >   		if (status > 0 && (status & NVME_SC_DNR))
> >   			recon = false;
> > +		if (status == NVME_SC_AUTH_REQUIRED || status == -ECONNREFUSED)
> > +			recon = false;
> >   	} else if (time_after_eq(jiffies, rport->dev_loss_end))
> >   		recon = false;
> Is this still required after the patchset to retry authentication errors?

Do you mean

  48dae46676d1 ("nvme: enable retries for authentication commands")

?

In this case yes, I've tested on top of this patch. This breaks the loop
where the provided key is invalid or is missing. The loop would happy
retry until reaching max of retries.