Commit 72725802 authored by Nagamani PV's avatar Nagamani PV Committed by Jakub Kicinski
Browse files

s390/net: Remove NETIUCV device driver 



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: default avatarNagamani PV <nagamani@linux.ibm.com>
Reviewed-by: default avatarAlexandra Winter <wintera@linux.ibm.com>
Signed-off-by: default avatarAlexandra Winter <wintera@linux.ibm.com>
Reviewed-by: default avatarSimon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250715074210.3999296-1-wintera@linux.ibm.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 071a2ef5

Documentation/arch/s390/driver-model.rst

+0 −21
Original line number Diff line number Diff line
@@ -305,24 +305,3 @@ xpram shows up under devices/system/ as 'xpram'. 


For each cpu, a directory is created under devices/system/cpu/. Each cpu has an

attribute 'online' which can be 0 or 1.
 




4. Other devices

----------------



4.1 Netiucv

-----------



The netiucv driver creates an attribute 'connection' under

bus/iucv/drivers/netiucv. Piping to this attribute creates a new netiucv

connection to the specified host.



Netiucv connections show up under devices/iucv/ as "netiucv<ifnum>". The interface

number is assigned sequentially to the connections defined via the 'connection'

attribute.



user

    - shows the connection partner.



buffer

    - maximum buffer size. Pipe to it to change buffer size.

drivers/s390/net/Kconfig

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Original line number Diff line number Diff line
@@ -17,18 +17,6 @@ config CTCM 
	  To compile into the kernel, choose Y.

	  If you do not need any channel-to-channel connection, choose N.



config NETIUCV

	def_tristate m

	prompt "IUCV network device support (VM only)"

	depends on IUCV && NETDEVICES

	help

	  Select this option if you want to use inter-user communication

	  vehicle networking under VM or VIF. It enables a fast communication

	  link between VM guests. Using ifconfig a point-to-point connection

	  can be established to the Linux on IBM System z

	  running on the other VM guest. To compile as a module, choose M.

	  The module name is netiucv. If unsure, choose Y.



config SMSGIUCV

	def_tristate m

	prompt "IUCV special message support (VM only)"

drivers/s390/net/Makefile

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@@ -5,7 +5,6 @@ 


ctcm-y += ctcm_main.o ctcm_fsms.o ctcm_mpc.o ctcm_sysfs.o ctcm_dbug.o

obj-$(CONFIG_CTCM) += ctcm.o fsm.o

obj-$(CONFIG_NETIUCV) += netiucv.o fsm.o

obj-$(CONFIG_SMSGIUCV) += smsgiucv.o

obj-$(CONFIG_SMSGIUCV_EVENT) += smsgiucv_app.o

qeth-y += qeth_core_sys.o qeth_core_main.o qeth_core_mpc.o qeth_ethtool.o

drivers/s390/net/netiucv.c

deleted100644 → 0
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File deleted.

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