Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
IBV_CREATE_QP(3)	Libibverbs Programmer's	Manual	      IBV_CREATE_QP(3)

       ibv_create_qp, ibv_destroy_qp - create or destroy a queue pair (QP)

       #include	<infiniband/verbs.h>

       struct ibv_qp *ibv_create_qp(struct ibv_pd *pd,
				    struct ibv_qp_init_attr *qp_init_attr);

       int ibv_destroy_qp(struct ibv_qp	*qp);

       ibv_create_qp()	creates	 a queue pair (QP) associated with the protec-
       tion domain pd.	 The  argument	qp_init_attr  is  an  ibv_qp_init_attr
       struct, as defined in <infiniband/verbs.h>.

       struct ibv_qp_init_attr {
	       void		      *qp_context;     /* Associated context of	the QP */
	       struct ibv_cq	      *send_cq;	       /* CQ to	be associated with the Send Queue (SQ) */
	       struct ibv_cq	      *recv_cq;	       /* CQ to	be associated with the Receive Queue (RQ) */
	       struct ibv_srq	      *srq;	       /* SRQ handle if	QP is to be associated with an SRQ, otherwise NULL */
	       struct ibv_qp_cap       cap;	       /* QP capabilities */
	       enum ibv_qp_type	       qp_type;	       /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD	or IBV_QPT_RAW_PACKET */
	       int		       sq_sig_all;     /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */

       struct ibv_qp_cap {
	       uint32_t		       max_send_wr;    /* Requested max	number of outstanding WRs in the SQ */
	       uint32_t		       max_recv_wr;    /* Requested max	number of outstanding WRs in the RQ */
	       uint32_t		       max_send_sge;   /* Requested max	number of scatter/gather (s/g) elements	in a WR	in the SQ */
	       uint32_t		       max_recv_sge;   /* Requested max	number of s/g elements in a WR in the SQ */
	       uint32_t		       max_inline_data;/* Requested max	number of data (bytes) that can	be posted inline to the	SQ, otherwise 0	*/

       The  function  ibv_create_qp() will update the qp_init_attr->cap	struct
       with the	actual QP values of the	QP that	was created; the  values  will
       be greater than or equal	to the values requested.

       ibv_destroy_qp()	destroys the QP	qp.

       ibv_create_qp() returns a pointer to the	created	QP, or NULL if the re-
       quest fails.  Check the QP number (qp_num) in the returned QP.

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

       ibv_create_qp() will fail if a it is asked to create QP of a type other
       than IBV_QPT_RC or IBV_QPT_UD associated	with an	SRQ.

       The attributes max_recv_wr and max_recv_sge  are	 ignored  by  ibv_cre-
       ate_qp()	if the QP is to	be associated with an SRQ.

       ibv_destroy_qp()	fails if the QP	is attached to a multicast group.

       ibv_alloc_pd(3),	ibv_modify_qp(3), ibv_query_qp(3)

       Dotan Barak <>

libibverbs			  2006-10-31		      IBV_CREATE_QP(3)


Want to link to this manual page? Use this URL:

home | help