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    • Sean Hefty's avatar
      RDMA/cma: Add multicast communication support · c8f6a362
      Sean Hefty authored
      Extend rdma_cm to support multicast communication.  Multicast support
      is added to the existing RDMA_PS_UDP port space, as well as a new
      RDMA_PS_IPOIB port space.  The latter port space allows joining the
      multicast groups used by IPoIB, which enables offloading IPoIB traffic
      to a separate QP.  The port space determines the signature used in the
      MGID when joining the group.  The newly added RDMA_PS_IPOIB also
      allows for unicast operations, similar to RDMA_PS_UDP.
      
      Supporting the RDMA_PS_IPOIB requires changing how UD QPs are initialized,
      since we can no longer assume that the qkey is constant.  This requires
      saving the Q_Key to use when attaching to a device, so that it is
      available when creating the QP.  The Q_Key information is exported to
      the user through the existing rdma_init_qp_attr() interface.
      
      Multicast support is also exported to userspace through the rdma_ucm.
      Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      c8f6a362
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