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

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Message-ID: <20240405144752.GA6352@lst.de>
Date: Fri, 5 Apr 2024 16:47:52 +0200
From: Christoph Hellwig <hch@....de>
To: Daniel Wagner <dwagner@...e.de>
Cc: Christoph Hellwig <hch@....de>, 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 12:02:51PM +0200, Daniel Wagner wrote:
> > >  	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.

True.

> 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.

No, but we should not overload the return value.  Pass in the req
or sq, or add a new paramter for the auth fail reason.