RDMA_JOIN_MULTICAST(3)					   Librdmacm Programmer's Manual				    RDMA_JOIN_MULTICAST(3)

NAME

       rdma_join_multicast - Joins a multicast group.

SYNOPSIS

       #include <rdma/rdma_cma.h>

       int rdma_join_multicast (struct rdma_cm_id *id, struct sockaddr *addr, void *context);

ARGUMENTS

       id	   Communication identifier associated with the request.

       addr	   Multicast address identifying the group to join.

       context	   User-defined context associated with the join request.

DESCRIPTION

       Joins a multicast group and attaches an associated QP to the group.

RETURN VALUE

       Returns 0 on success, or -1 on error.  If an error occurs, errno will be set to indicate the failure reason.

NOTES

       Before  joining	a  multicast group, the rdma_cm_id must be bound to an RDMA device by calling rdma_bind_addr or rdma_resolve_addr.  Use of
       rdma_resolve_addr requires the local routing tables to resolve the multicast address to an RDMA device, unless a specific source address is
       provided.  The user must call rdma_leave_multicast to leave the multicast group and release any multicast resources.  After the join opera-
       tion completes, if a QP is associated with the rdma_cm_id, it is automatically attached to the multicast group when the multicast event	is
       retrieved  by  the  user.  Otherwise, the user is responsible for calling ibv_attach_mcast to bind the QP to the multicast group.  The join
       context is returned to the user through the private_data field in the rdma_cm_event.

SEE ALSO

       rdma_leave_multicast(3), rdma_bind_addr(3), rdma_resolve_addr(3), rdma_create_qp(3), rdma_get_cm_event(3)

librdmacm							    2008-01-02						    RDMA_JOIN_MULTICAST(3)