C.3.1 FUNCTION identifier C.3.2 Virtual function number C.3.3 Physical network identifier The FUNCTION identifier (FID) is a hexadecimal number 000 - FFF that you use to assign a  PCHID to the FUNCTION to identify the specific hardware feature in the PCIe I/O drawer.  Because the FUNCTION is not related to a channel subsystem, all LPARs on a central  processor complex (CPC) can be defined to it. However, a FUNCTION cannot be shared  between LPARs. It is only dedicated or reconfigurable by using the  PART  parameter. The  TYPE parameter is required for z14. If you want several LPARs to use a zEDC Express feature, you must use a Virtual Function  (VF) number. A VF number is a number 1 -  nnn , where  nnn  is the maximum number of LPARs  that the feature supports. The maximum is 15 for the zEDC Express feature, 31 for the 10GbE  RoCE Express (FC 0411), 126 for the RoCE Express2 feature, and 254 for the zHyperLink  Express feature$^{3}$. The physical network ID (PNETID) is required to set up the Shared Memory Communications  over Remote Direct Memory Access (SMC-R) communication between two RoCE  Express/Express2 features. Each FUNCTION definition supports up to four PNETIDs. Notes:  Consider the following points: GLYPH<SM590000> For more information about FUNCTION statement, see  IBM Z Input/Output  Configuration Program User’s Guide for ICP IOCP , SB10-7163. GLYPH<SM590000> The definition of RoCE Express/Express2 feature is required to pair up with an OSD  CHPID definition by using the parameter of PNETID. The OSD CHPID definition  statement is not listed in the example.  3 The zHyperLink Express feature is not managed by the Resource Groups firmware. 474  IBM z14 (3906) Technical Guide