3 .TH IBV_CREATE_QP 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
5 ibv_create_qp, ibv_destroy_qp \- create or destroy a queue pair (QP)
8 .B #include <infiniband/verbs.h>
10 .BI "struct ibv_qp *ibv_create_qp(struct ibv_pd " "*pd" ,
11 .BI " struct ibv_qp_init_attr " "*qp_init_attr" );
13 .BI "int ibv_destroy_qp(struct ibv_qp " "*qp" );
17 creates a queue pair (QP) associated with the protection domain
21 is an ibv_qp_init_attr struct, as defined in <infiniband/verbs.h>.
24 struct ibv_qp_init_attr {
26 void *qp_context; /* Associated context of the QP */
27 struct ibv_cq *send_cq; /* CQ to be associated with the Send Queue (SQ) */
28 struct ibv_cq *recv_cq; /* CQ to be associated with the Receive Queue (RQ) */
29 struct ibv_srq *srq; /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
30 struct ibv_qp_cap cap; /* QP capabilities */
31 enum ibv_qp_type qp_type; /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD or IBV_QPT_XRC */
32 int sq_sig_all; /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
33 struct ibv_xrc_domain *xrc_domain; /* XRC domain the QP will be associated with (valid only for IBV_QPT_XRC QP), otherwise NULL */
40 uint32_t max_send_wr; /* Requested max number of outstanding WRs in the SQ */
41 uint32_t max_recv_wr; /* Requested max number of outstanding WRs in the RQ */
42 uint32_t max_send_sge; /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
43 uint32_t max_recv_sge; /* Requested max number of s/g elements in a WR in the SQ */
44 uint32_t max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
52 .I qp_init_attr\fB\fR->cap
53 struct with the actual \s-1QP\s0 values of the QP that was created;
54 the values will be greater than or equal to the values requested.
61 returns a pointer to the created QP, or NULL if the request fails.
62 Check the QP number (\fBqp_num\fR) in the returned QP.
65 returns 0 on success, or the value of errno on failure (which indicates the failure reason).
68 will fail if a it is asked to create QP of a type other than
72 associated with an SRQ.
74 The attributes max_recv_wr and max_recv_sge are ignored by
76 if the QP is to be associated with an SRQ.
79 fails if the QP is attached to a multicast group.
82 .BR ibv_modify_qp (3),
86 Dotan Barak <dotanb@mellanox.co.il>