ibv_query_gid

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Gets the group ID (GID) that is the network interface controller (NIC)'s Media Control Access (MAC) address.

Syntax

#include <rdma/verbs.h>
int ibv_query_gid(struct ibv_context *context, uint8_t port_num, int index, union ibv_gid *gid)

Description

The ibv_query_gid() function returns the MAC address of the NIC in the subnet_prefix parameter and 0 in the interface_id identifier.

Input Parameters

Item Description
context Specifies the context pointer that is returned by the ibv_open_device() function.
port_num Specifies the port number for the device that is returned by the ibv_query_device() function.
index Specifies the index for the port_num parameter that is derived from the attributes that are returned by the ibv_query_port() function.

Output Parameter

Item Description
gid Specifies the pointer where the group ID (GID) can be stored.

Return Values

Item Description
0 On success.
-1 The request fails because of one of the following reasons:
  • The context or gid parameter is NULL.
  • The open or write operation failed on the /dev/rdma/ofed_adm administrator device. 
ibv_gid
union ibv_gid 
{ 
       uint8_t      raw[16]; 
       struct 
       { 
           uint64_t subnet_prefix; 
           uint64_t interface_id; 
       } global; 
};