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IBV_ATTACH_MCAST(3)		  Libibverbs Programmer's Manual	      IBV_ATTACH_MCAST(3)

       ibv_attach_mcast, ibv_detach_mcast - attach and detach a queue pair (QPs) to/from a multi-
       cast group

       #include <infiniband/verbs.h>

       int ibv_attach_mcast(struct ibv_qp *qp, const union ibv_gid *gid,
			    uint16_t lid);

       int ibv_detach_mcast(struct ibv_qp *qp, const union ibv_gid *gid,
			    uint16_t lid);

       ibv_attach_mcast() attaches the QP qp to the multicast group having MGID gid and MLID lid.

       ibv_detach_mcast() detaches the QP qp to the multicast group having MGID gid and MLID lid.

       ibv_attach_mcast() and ibv_detach_mcast() returns 0 on success, or the value of	errno  on
       failure (which indicates the failure reason).

       Only QPs of Transport Service Type IBV_QPT_UD may be attached to multicast groups.

       If  a QP is attached to the same multicast group multiple times, the QP will still receive
       a single copy of a multicast message.

       In order to receive multicast messages, a join request for the  multicast  group  must  be
       sent  to  the subnet administrator (SA), so that the fabric's multicast routing is config-
       ured to deliver messages to the local port.


       Dotan Barak <dotanba@gmail.com>

libibverbs				    2006-10-31			      IBV_ATTACH_MCAST(3)
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