linux-kernel - Re: [PATCH v4 3/5] nvmet: return DHCHAP status codes from nvmet_setup

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Date: Fri, 5 Apr 2024 12:02:51 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: James Smart <james.smart@...adcom.com>, 
	Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>, Hannes Reinecke <hare@...e.de>, 
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...nel.org>
Subject: Re: [PATCH v4 3/5] nvmet: return DHCHAP status codes from
 nvmet_setup_auth()

On Fri, Apr 05, 2024 at 08:20:55AM +0200, Christoph Hellwig wrote:
> > @@ -131,7 +131,6 @@ int nvmet_setup_auth(struct nvmet_ctrl *ctrl)
> >  	int ret = 0;
> >  	struct nvmet_host_link *p;
> >  	struct nvmet_host *host = NULL;
> > -	const char *hash_name;
> >  
> >  	down_read(&nvmet_config_sem);
> >  	if (nvmet_is_disc_subsys(ctrl->subsys))
> > @@ -149,13 +148,16 @@ int nvmet_setup_auth(struct nvmet_ctrl *ctrl)
> >  	}
> >  	if (!host) {
> >  		pr_debug("host %s not found\n", ctrl->hostnqn);
> > -		ret = -EPERM;
> > +		ret = NVME_AUTH_DHCHAP_FAILURE_FAILED;
> >  		goto out_unlock;
> 
> This is now returning returning random on the wire fields that aren't
> even the NVMe status codes from a function otherwise returning Linux
> errno values.  I can't see how this works or is maintainable long term.

This is the target side and we generate the on wire return code here.
Are you sure I should map this to errno codes and the back to NVME
status codes? Sure, this is possible but don't really think it makes
sense.