linux-kernel - Re: [PATCH v4 5/7] nvme-tcp: Support KeyUpdate

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Message-ID: <4b2e5998-a646-4f99-8c87-95975ff8fe66@suse.de>
Date: Wed, 22 Oct 2025 08:56:41 +0200
From: Hannes Reinecke <hare@...e.de>
To: Alistair Francis <alistair23@...il.com>
Cc: chuck.lever@...cle.com, hare@...nel.org,
 kernel-tls-handshake@...ts.linux.dev, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-nvme@...ts.infradead.org, linux-nfs@...r.kernel.org,
 kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me,
 kch@...dia.com, Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH v4 5/7] nvme-tcp: Support KeyUpdate

On 10/22/25 06:35, Alistair Francis wrote:
> On Mon, Oct 20, 2025 at 4:22 PM Hannes Reinecke <hare@...e.de> wrote:
>>
>> On 10/17/25 06:23, alistair23@...il.com wrote:
>>> From: Alistair Francis <alistair.francis@....com>
>>>
[ .. ]>>> @@ -1723,6 +1763,7 @@ static void nvme_tcp_tls_done(void 
*data, int status, key_serial_t pskid,
>>>                        ctrl->ctrl.tls_pskid = key_serial(tls_key);
>>>                key_put(tls_key);
>>>                queue->tls_err = 0;
>>> +             queue->user_session_id = user_session_id;
>>
>> Hmm. I wonder, do we need to store the generation number somewhere?
>> Currently the sysfs interface is completely oblivious that a key update
>> has happened. I really would like to have _some_ indicator there telling
>> us that a key update had happened, and the generation number would be
>> ideal here.
> 
> I don't follow.
> 
> The TLS layer will report the number of KeyUpdates that have been
> received. Userspace also knows that a KeyUpdate happened as we call to
> userspace to handle updating the keys.
> 
Oh, the tlshd will know that (somehow). But everyone else will not; the
'tls_pskid' contents will stay the the same.
Can we have a sysfs attribute reporting the sequence number of the most
recent KeyUpdate?
Cheers,
Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich