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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 mul- ticast address to an RDMA device, unless a specific source address is provided. The user must call rdma_leave_multicast to leave the multi- cast group and release any multicast resources. After the join opera- tion completes, if a QP is associated with the rdma_cm_id, it is auto- matically 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 con- text 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)