– Transport data over unique RDMA network interface cards (RNICs) that are logically  bound together to form Link Groups. Link Groups are used for high availability and load  balancing needs. GLYPH<SM590000> Single root I/O virtualization (SR-IOV) is a Peripheral Component Interconnectfi Express  (PCIe) standard that define extensions to PCIe specifications. SR-IOV enables sharing of  10GbE RoCE Express2 ports between LPARs in the z14 and z14 ZR1. Ports in the IBM Z 10GbE RoCE Express2 feature (also referred to as RNICs) are used as  the physical transport layer for RDMA. For more information about the 10GbE RoCE Express2 feature and SMC-R, see  IBM z14  Technical Guide , SG24-8451, and  IBM z/OS V2R2 Communications Server TCP/IP  Implementation Volume 1 , SG24-8360. For an overview of planning considerations, see “Shared Memory Communications - RDMA”  on page 22. The 10GbE RoCE Express and 10GbE RoCE Express2 features are native PCIe features;  therefore, the following HCD and IOCP definition rules differ from a non-native PCIe card,  such as OSA Express: 10.4.2 Planning for SMC-R configuration 10.4.3 Configuring SMC-R GLYPH<SM590000> PCIe Function Identifier (FID) must be defined in HCD or HCM to create IOCP input:  – FID is a hexadecimal value (three heximaldigits, range 000 - FFF), which specifies the  PCIe function.  – It  cannot  be assigned to a channel subsystem, so that any LPAR can be defined to a  function. – It features a PARTITION parameter that dedicates it to one LPAR or allows  reconfiguration among a group of LPARs. A function cannot be defined as  shared . – In z/OS system commands, PCIe FID is represented as PFID. GLYPH<SM590000> If the intended PCIe hardware supports multiple partitions, it has a decimal Virtual  Function Identifier (VF=) in the range 1 -  n , where  n  is the maximum number of partitions  that the PCIe feature supports.  GLYPH<SM590000> Other parameters that are specific to the PCIe feature. For example, the 10GbE RoCE  Express requires a Physical Network Identifier (PNETID=), and the new 10GbE RoCE  Express2 feature supports a port identifier (PORT=). GLYPH<SM590000> For function mapping to hardware, assign a Physical Channel Identifier (PCHID=) to  identify the hardware feature in a specific PCIe I/O drawer and the slot to be used for the  defined function. The following methods can be used: – Manually, by using the configurator (eCONFIG) PCHID report. – By using the CHPID Mapping tool and the eConfig Configuration Report File (CFR)  input. Note:  Unlike CHPIDs, multiple functions can be mapped to the same PCHID. This  mapping is conceptually similar to mapping multiple InfiniBand coupling CHPIDs to the  same adapter and port. 258  IBM z14 Model ZR1 Configuration Setup