For igb devices rte_eth_flow_ctrl_set does not work as expected. Pause frames
are always forwarded on igb, regardless of the RFCE, MPMCF and DPF registers.

Implication:
Pause frames will never be rejected by the host on 1G NICs and they will always
be forwarded.

Resolution/Workaround:
There is no workaround available.

Affected Environment/Platform:
All.

Driver/Module:
Poll Mode Driver (PMD).