Why are no interfaces seen in 'ifconfig -a' output for systems using Mellanox NIC cards?

Issue

• Network files ifcfg-eth* are not created for mellanox NIC card and in ifconfig -a and /sys/class/net mellanox interface are not shown.

• NIC is detected as per lspci output.
  ~~~
  81:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0)
  ~~