netdev - Re: [PATCH net-next] s390/net: Remove NETIUCV device driver

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Message-ID: <20250715143319.GC721198@horms.kernel.org>
Date: Tue, 15 Jul 2025 15:33:19 +0100
From: Simon Horman <horms@...nel.org>
To: Alexandra Winter <wintera@...ux.ibm.com>
Cc: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Thorsten Winkler <twinkler@...ux.ibm.com>,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	Nagamani PV <nagamani@...ux.ibm.com>
Subject: Re: [PATCH net-next] s390/net: Remove NETIUCV device driver

On Tue, Jul 15, 2025 at 09:42:10AM +0200, Alexandra Winter wrote:
> From: Nagamani PV <nagamani@...ux.ibm.com>
> 
> The netiucv driver creates TCP/IP interfaces over IUCV between Linux
> guests on z/VM and other z/VM entities.
> 
> Rationale for removal:
> - NETIUCV connections are only supported for compatibility with
>   earlier versions and not to be used for new network setups,
>   since at least Linux kernel 4.0.
> - No known active users, use cases, or product dependencies
> - The driver is no longer relevant for z/VM networking;
>   preferred methods include:
> 	* Device pass-through (e.g., OSA, RoCE)
> 	* z/VM Virtual Switch (VSWITCH)
> 
> The IUCV mechanism itself remains supported and is actively used
> via AF_IUCV, hvc_iucv, and smsg_iucv.
> 
> Signed-off-by: Nagamani PV <nagamani@...ux.ibm.com>
> Reviewed-by: Alexandra Winter <wintera@...ux.ibm.com>
> Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
> ---
>  Documentation/arch/s390/driver-model.rst |   21 -
>  drivers/s390/net/Kconfig                 |   12 -
>  drivers/s390/net/Makefile                |    1 -
>  drivers/s390/net/netiucv.c               | 2083 ----------------------
>  4 files changed, 2117 deletions(-)
>  delete mode 100644 drivers/s390/net/netiucv.c

Less is more :)

Reviewed-by: Simon Horman <horms@...nel.org>