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

NAME

       rdma_create_qp - Allocate a QP.

SYNOPSIS

       #include <rdma/rdma_cma.h>

       int rdma_create_qp (struct rdma_cm_id *id, struct ibv_pd *pd, struct ibv_qp_init_attr *qp_init_attr);

ARGUMENTS

       id	   RDMA identifier.

       pd	   Optional protection domain for the QP.

       qp_init_attr
		   Initial QP attributes.

DESCRIPTION

       Allocate a QP associated with the specified rdma_cm_id and transition it for sending and receiving.

RETURN VALUE

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

NOTES

       The  rdma_cm_id	must be bound to a local RDMA device before calling this function, and the protection domain must be for that same device.
       QPs allocated to an rdma_cm_id are automatically transitioned by the librdmacm through their states.  After being allocated, the QP will be
       ready to handle posting of receives.  If the QP is unconnected, it will be ready to post sends.

       If  a  protection  domain is not given - pd parameter is NULL - then the rdma_cm_id will be created using a default protection domain.  One
       default protection domain is allocated per RDMA device.

       The initial QP attributes are specified by the qp_init_attr parameter.	The  send_cq  and  recv_cq  fields  in	the  ibv_qp_init_attr  are
       optional.  If a send or receive completion queue is not specified, then a CQ will be allocated by the rdma_cm for the QP, along with corre-
       sponding completion channels.  Completion channels and CQ data created by the rdma_cm are exposed to the user through the rdma_cm_id struc-
       ture.

       The  actual  capabilities  and properties of the created QP will be returned to the user through the qp_init_attr parameter.  An rdma_cm_id
       may only be associated with a single QP.

SEE ALSO

       rdma_bind_addr(3), rdma_resolve_addr(3), rdma_destroy_qp(3), ibv_create_qp(3), ibv_modify_qp(3)

librdmacm							    2007-05-15							 RDMA_CREATE_QP(3)