Appendix D. Shared Memory Communications 483
D.2.7 Hardware configuration definitions
The following hardware configuration definitions (HCDs) are important.
Function ID
The RoCE feature is identified by a hexadecimal Function Identifier (FID). It has a dedicated
limit in the range 00 - FF. The shared limit is 000 - 0FFF in the HCD or Hardware
Management Console (HMC) to create the input/output configuration program (IOCP) input.
A FID can only be configured to one LPAR, but it is reconfigurable. The RoCE feature, as
installed in a specific PCIe I/O drawer and slot, is to be used for the defined function. The
physical installation (drawer and slot) determines the physical channel identifier (PCHID).
Only one FID can be defined for dedicated mode. Up to 31 FIDs can be defined for shared
mode (on a z13 and a z13s server) for each physical cards (PCHID).
Virtual Function ID
Virtual Function ID is defined when PCIe hardware is shared between LPARs. Virtual
Function ID has a decimal Virtual Function Identifier (VF=) in the range 1 – n, where n is the
maximum number of partitions the PCIe feature supports. For example, the RoCE feature
supports up to 31 partitions, and a zEDC Express feature supports up to 15.
Physical network ID
As one parameter for the FUNCTION statement, the physical network (PNet) ID is a
client-defined value for logically grouping OSD interfaces and RNIC adapters based on
physical connectivity. The PNet ID values are defined for both OSA and RNIC interfaces in the
HCD. A PNet ID is also defined for each physical port. z/OS Communications Server gets the
information during the activation of the interfaces and associates the OSD interfaces with the
RNIC interfaces that have matching PNet ID values.
Attention: If you do not configure a PNet ID for the RNIC adapter, activation fails. If you do
not configure a PNet ID for the OSA adapter, activation succeeds, but the interface is not
eligible to use SMC-R.
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