When an IBM® 10GbE RoCE Express® interface is first started, VTAM® dynamically creates a transport resource list element (TRLE) to represent it. The dynamically created name is of the form IUTpffff, where p is the port number and ffff is the PCI-Express function ID (PFID). For instance, if you specified GLOBALCONFIG SMCR PFID 0018 PORTNUM 1, the TRLE name would be IUT10018.
You can use the VTAM DISPLAY
TRL and DISPLAY ID commands to display information about the TRLE
representation of the 10GbE RoCE Express interface,
including information about the physical network ID (PNet ID), and which TCP stacks 
use
the
interface.
Use the presence of
a virtual function number (VFN) in the DISPLAY TRL or DISPLAY ID command
output to determine whether the RoCE Express feature
operates in a shared RoCE environment. A VFN is present in a shared
environment and absent in a dedicated environment.VTAM collects tuning statistics for 10GbE RoCE Express interfaces when requested by using the TNSTAT start option or the MODIFY TNSTAT command. Tuning statistics that represent processing at a 10GbE RoCE Express interface level and statistics at a user or TCP/IP stack level are both maintained. The TCP/IP stack level statistics are also provided on the GetRnics request. For more information, see Network Management Interface.
For more information about the VTAM commands, see z/OS Communications Server: SNA Operation. For more information about gathering tuning statistics, see z/OS Communications Server: SNA Network Implementation Guide.