Configuring a HiperSockets device for AF_IUCV addressing

Red Hat Enterprise Linux 9.2 LPAR mode z/VM guest

Use the hsuid attribute of a HiperSockets device in layer 3 mode to identify it to the AF_IUCV addressing family support.

Before you begin

Support for AF_IUCV based connections through real HiperSockets requires Completion Queue Support.
The device must be set up for AF_IUCV addressing (see Setting up HiperSockets devices for AF_IUCV addressing).

To set an identifier, issue a command of this form:

# echo <value> > /sys/bus/ccwgroup/drivers/qeth/0.0.a007/hsuid

The identifier is case-sensitive and must adhere to these rules:

It must be 1 - 8 characters.
It must be unique across your environment.
It must not match any z/VM® user ID in your environment. The AF_IUCV addressing family support also supports z/VM IUCV connections.

In this example, MYHOST01 is set as the identifier for a HiperSockets device with bus ID 0.0.a007.

# echo MYHOST01 > /sys/bus/ccwgroup/drivers/qeth/0.0.a007/hsuid