1IBV_CREATE_QP_EX(3)     Libibverbs Programmer's Manual     IBV_CREATE_QP_EX(3)
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NAME

6       ibv_create_qp_ex, ibv_destroy_qp - create or destroy a queue pair (QP)
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SYNOPSIS

9       #include <infiniband/verbs.h>
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11       struct ibv_qp *ibv_create_qp_ex(struct ibv_context *context,
12                                       struct ibv_qp_init_attr_ex *qp_init_attr);
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14       int ibv_destroy_qp(struct ibv_qp *qp);
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DESCRIPTION

17       ibv_create_qp_ex()  creates  a queue pair (QP) associated with the pro‐
18       tection   domain   pd.    The   argument    qp_init_attr_ex    is    an
19       ibv_qp_init_attr_ex struct, as defined in <infiniband/verbs.h>.
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21       struct ibv_qp_init_attr_ex {
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 or IBV_QPT_RAW_PACKET */
28               int                     sq_sig_all;     /* If set, each Work Request (WR) submitted to the SQ generates a completion entry */
29               uint32_t                comp_mask; /* Identifies valid fields */
30               struct ibv_pd          *pd;        /* PD to be associated with the QP */
31               struct ibv_xrcd        *xrcd;      /* XRC domain to be associated with the target QP */
32               enum ibv_qp_create_flags create_flags;  /* Creation flags for this QP */
33       };
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35       struct ibv_qp_cap {
36               uint32_t                max_send_wr;    /* Requested max number of outstanding WRs in the SQ */
37               uint32_t                max_recv_wr;    /* Requested max number of outstanding WRs in the RQ */
38               uint32_t                max_send_sge;   /* Requested max number of scatter/gather (s/g) elements in a WR in the SQ */
39               uint32_t                max_recv_sge;   /* Requested max number of s/g elements in a WR in the SQ */
40               uint32_t                max_inline_data;/* Requested max number of data (bytes) that can be posted inline to the SQ, otherwise 0 */
41       };
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43       The  function  ibv_create_qp_ex()  will update the qp_init_attr_ex->cap
44       struct with the actual QP values of the QP that was created; the values
45       will be greater than or equal to the values requested.
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47       ibv_destroy_qp() destroys the QP qp.
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RETURN VALUE

50       ibv_create_qp_ex()  returns a pointer to the created QP, or NULL if the
51       request fails.  Check the QP number (qp_num) in the returned QP.
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53       ibv_destroy_qp() returns 0 on success, or the value of errno on failure
54       (which indicates the failure reason).
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NOTES

57       The  attributes  max_recv_wr  and  max_recv_sge are ignored by ibv_cre‐
58       ate_qp_ex() if the QP is to be associated with an SRQ.
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60       ibv_destroy_qp() fails if the QP is attached to a multicast group.
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SEE ALSO

63       ibv_alloc_pd(3), ibv_modify_qp(3), ibv_query_qp(3)
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AUTHORS

66       Yishai Hadas <yishaih@mellanox.com>
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70libibverbs                        2013-06-26               IBV_CREATE_QP_EX(3)
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