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

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Message-ID: <17154023-868d-4889-b499-a334d360e8e8@suse.de>
Date: Mon, 20 Oct 2025 08:26:44 +0200
From: Hannes Reinecke <hare@...e.de>
To: alistair23@...il.com, 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
Cc: kbusch@...nel.org, axboe@...nel.dk, hch@....de, sagi@...mberg.me,
 kch@...dia.com, Alistair Francis <alistair.francis@....com>
Subject: Re: [PATCH v4 7/7] nvmet-tcp: Support KeyUpdate

On 10/17/25 06:23, alistair23@...il.com wrote:
> From: Alistair Francis <alistair.francis@....com>
> 
> If the nvmet_tcp_try_recv() function return EKEYEXPIRED or if we receive
> a KeyUpdate handshake type then the underlying TLS keys need to be
> updated.
> 
> If the NVMe Host (TLS client) initiates a KeyUpdate this patch will
> allow the NVMe layer to process the KeyUpdate request and forward the
> request to userspace. Userspace must then update the key to keep the
> connection alive.
> 
> This patch allows us to handle the NVMe host sending a KeyUpdate
> request without aborting the connection. At this time we don't support
> initiating a KeyUpdate.
> 
> Link: https://datatracker.ietf.org/doc/html/rfc8446#section-4.6.3
> Signed-off-by: Alistair Francis <alistair.francis@....com>
> ---
> v4:
>   - Restructure code to avoid #ifdefs and forward declarations
>   - Use a helper function for checking -EKEYEXPIRED
>   - Remove all support for initiating KeyUpdate
>   - Use helper function for restoring callbacks
> v3:
>   - Use a write lock for sk_user_data
>   - Fix build with CONFIG_NVME_TARGET_TCP_TLS disabled
>   - Remove unused variable
> v2:
>   - Use a helper function for KeyUpdates
>   - Ensure keep alive timer is stopped
>   - Wait for TLS KeyUpdate to complete
> 
>   drivers/nvme/target/tcp.c | 205 ++++++++++++++++++++++++++------------
>   1 file changed, 143 insertions(+), 62 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

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