MFC r272027:
Hardware driver update from Mellanox Technologies, including:
- improved performance
- better stability
- new features
- bugfixes
Supported HCAs:
- ConnectX-2
- ConnectX-3
- ConnectX-3 Pro
NOTE: - TSO feature needs r271946, which is not yet merged.
Sponsored by: Mellanox Technologies
Approved by: re, glebius