IP Services: Modify GLOBALCONFIG SMCR PFID definitions

Description

In z/OS V2R1 Communications Server, VTAM provided physical function services for IBM 10GbE RoCE Express features used for Shared Memory Communications via Remote Direct Memory Access (SMC-R) processing. This allowed multiple TCP/IP stacks operating in the same logical partition (LPAR) to share a RoCE Express feature by configuring and activating the same Peripheral Component Interconnect Express (PCIe) function ID (PFID) representation of the feature. Starting with z/OS V2R2 on a z13 server, each TCP/IP stack must have unique PFID values to represent the RoCE Express feature.

Table 1 provides more details about this migration action. Use this information to plan your changes to the system.

Table 1. Information about this migration action
Element or feature: z/OS Communications Server.
When change was introduced: z/OS V2R2.
Applies to migration from: z/OS V2R1.
Timing: Before the first IPL of z/OS V2R2.
Is the migration action required? Yes, if all the following conditions are true:
  • You used Shared Memory Communications – RDMA in z/OS V2R1 Communications Server.
  • The 10GbE RoCE Express features operated in a dedicated RoCE environment.
  • You are running on a z13 server.
Target system hardware requirements: Only applicable to a z13 server. If you are running on a server before z13, this migration action does not apply to you.
Target system software requirements: None.
Other system (coexistence or fallback) requirements: None.
Restrictions: None.
System impacts: None.
Related IBM® Health Checker for z/OS® check: None.

Steps to take

Before starting your TCP/IP stacks that activate 10GbE RoCE Express features, perform the following steps:
  1. Use the hardware configuration definition (HCD) to define a unique FID value for each TCP/IP stack that will be activating the 10GbE RoCE Express feature. You must also assign a virtual function number (VFN) for each potential user of the 10GbE RoCE Express feature.
  2. Modify the GLOBALCONFIG SMCR statement in the TCP/IP profile to specify the PFID values that are assigned for this stack. Update the GLOBALCONFIG statements for all TCP/IP stacks that activate a given 10GbE RoCE Express before starting any of the TCP/IP stacks. The PFID values should correspond to the FID values you defined in the HCD.

Reference information

For more information, see z/OS Communications Server: IP Configuration Guide.

Parent topic: Communications Server actions to perform before the first IPL of z/OS V2R2