1. Back-port master/RP/6061 to integration3 branch
2. This is required by "address path structure fields"
   1) hop_limit:
      For IB and RoCE version 1.0: GRH Hop Limit.
   2) rgid_or_rip:
      For IB port - Valid if the GRH bit is set.
      For an Ethernet port for RoCE mode, this field must always be valid and
      contain the remote GID address.
   3) traffic class:
      For InfiniBand and RoCE v1.0: GRH TClass
3. According to IB Spec:
   1) Address vector, for UD transports only, containing:
      For global destination:
         • Flow label.
         • Hop limit.
         • Traffic class.
         • Source GID index.
   2) Address vector, for RC & UC transports only, containing:
      For global destination:
         • Traffic class.
         • Flow label.
         • Hop limit.
         • Source GID index.
         • Destination’s GID.

Signed-off-by: Changcheng Liu <jerrliu@nvidia.com>

Signed-off-by: Changcheng Liu <jerrliu@nvidia.com>