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70 Appendix F. Additional Information for S/390 and zSeries Users

SUBCHANNELS=0.0.1b00,0.0.1b01

NETTYPE=ctc

CTCPROT=0

TYPE=CTC

• Activate the device.

Based on the type interface being added, issue an ifup command:

# ifup ctc<n>

F.6.2.4. Working With the IUCV Device Driver

The Inter-User Communication Vehicle (IUCV) is a VM communication facility that enables a pro-

gram running in one VM guest to communicate with another VM guest, with a control program, or

even with itself. The Linux for zSeries and S/390 IUCV device driver is a network device driver that

uses IUCV to connect Linux guests running on different VM user IDs, or to connect a Linux guest to

another VM guest such as a TCP/IP service machine.

The IUCV driver assigns a base interface name like the following:

iucv<n>

The value <n> is an integer that uniquely identiﬁes the device. <n> is 0 for the ﬁrst device of that

type, 1 for the second, and so on.

• Load the device driver:

# modprobe netiucv

• Create the IUCV device:

# echo <peer_id> > /sys/bus/iucv/drivers/netiucv/connection

The value of <peer_id> is the guest ID of the VM guest you want to connect to. The IUCV

device driver interprets the ID as uppercase. This is usually TCPIP.

This creates a sysfs structure like the following:

cat /sys/bus/iucv/drivers/netiucv/netiucv<n>

The value <n> is an integer that uniquely identiﬁes the device. <n> is 0 for the ﬁrst device of

that type, 1 for the second, and so on.

• Conﬁgure the device.

Set the maximum buffer size if needed:

# echo <value> > /sys/bus/iucv/drivers/netiucv/netiucv<n>/buffer

The <value> is the number of bytes you want to set. If you specify a value outside the valid

range, the command is ignored.

The permissible range of values for the maximum buffer size depends on the MTU settings. It must

be in the range <minimum MTU + header size> to <maximum MTU + header size>. The header

space is typically 4 bytes. The default for the maximum buffer size is 32768 bytes (32 KB).

For more information on conﬁguration of the IUCV driver, refer to the following:

http://oss.software.ibm.com/developerworks/opensource/linux390/docu/lx26apr04dd01.pdf

(Linux for zSeries and S/390 Device Drivers, Features, and Commands)

• Deﬁne the alias.

Based on the type interface being added, add a line to /etc/modprobe.conf that is like the

following:

iucv<n> alias netiucv

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 84 85 86

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