1IBV_CREATE_QP(3)        Libibverbs Programmer's Manual        IBV_CREATE_QP(3)
2
3
4

NAME

6       ibv_create_qp, ibv_destroy_qp - create or destroy a queue pair (QP)
7

SYNOPSIS

9       #include <infiniband/verbs.h>
10
11       struct ibv_qp *ibv_create_qp(struct ibv_pd *pd,
12                                    struct ibv_qp_init_attr *qp_init_attr);
13
14       int ibv_destroy_qp(struct ibv_qp *qp);
15

DESCRIPTION

17       ibv_create_qp()  creates  a queue pair (QP) associated with the protec‐
18       tion domain pd.   The  argument  qp_init_attr  is  an  ibv_qp_init_attr
19       struct, as defined in <infiniband/verbs.h>.
20
21       struct ibv_qp_init_attr {
22               void                   *qp_context;     /* Associated context of the QP */
23               struct ibv_cq          *send_cq;        /* CQ to be associated with the Send Queue (SQ) */
24               struct ibv_cq          *recv_cq;        /* CQ to be associated with the Receive Queue (RQ) */
25               struct ibv_srq         *srq;            /* SRQ handle if QP is to be associated with an SRQ, otherwise NULL */
26               struct ibv_qp_cap       cap;            /* QP capabilities */
27               enum ibv_qp_type        qp_type;        /* QP Transport Service Type: IBV_QPT_RC, IBV_QPT_UC, IBV_QPT_UD, IBV_QPT_RAW_PACKET or IBV_QPT_DRIVER */
28               int                     sq_sig_all;     /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
29       };
30
31       struct ibv_qp_cap {
32               uint32_t                max_send_wr;    /* Requested max number of outstanding WRs in the SQ */
33               uint32_t                max_recv_wr;    /* Requested max number of outstanding WRs in the RQ */
34               uint32_t                max_send_sge;   /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
35               uint32_t                max_recv_sge;   /* Requested max number of s/g elements in a WR in the RQ */
36               uint32_t                max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
37       };
38
39       The  function  ibv_create_qp() will update the qp_init_attr->cap struct
40       with the actual QP values of the QP that was created; the  values  will
41       be greater than or equal to the values requested.
42
43       ibv_destroy_qp() destroys the QP qp.
44

RETURN VALUE

46       ibv_create_qp()  returns  a  pointer  to the created QP, or NULL if the
47       request fails.  Check the QP number (qp_num) in the returned QP.
48
49       ibv_destroy_qp() returns 0 on success, or the value of errno on failure
50       (which indicates the failure reason).
51

NOTES

53       ibv_create_qp() will fail if a it is asked to create QP of a type other
54       than IBV_QPT_RC or IBV_QPT_UD associated with an SRQ.
55
56       The attributes max_recv_wr and max_recv_sge  are  ignored  by  ibv_cre‐
57       ate_qp() if the QP is to be associated with an SRQ.
58
59       ibv_destroy_qp() fails if the QP is attached to a multicast group.
60
61       IBV_QPT_DRIVER  does  not  represent a specific service and is used for
62       vendor specific QP logic.
63

SEE ALSO

65       ibv_alloc_pd(3), ibv_modify_qp(3), ibv_query_qp(3)
66

AUTHORS

68       Dotan Barak <dotanba@gmail.com>
69
70
71
72libibverbs                        2006-10-31                  IBV_CREATE_QP(3)
Impressum