IBV_CREATE_SRQ_EX(3)    Libibverbs Programmer's Manual    IBV_CREATE_SRQ_EX(3)

NAME
       ibv_create_srq_ex, ibv_destroy_srq - create or destroy a shared receive
       queue (SRQ)

SYNOPSIS
       #include <infiniband/verbs.h>

       struct ibv_srq *ibv_create_srq_ex(struct ibv_context *context, struct
                                      ibv_srq_init_attr_ex *srq_init_attr_ex);

       int ibv_destroy_srq(struct ibv_srq *srq);

DESCRIPTION
       ibv_create_srq_ex() creates a shared receive queue (SRQ) supporting
       both basic and xrc modes.  The argument srq_init_attr_ex is an
       ibv_srq_init_attr_ex struct, as defined in <infiniband/verbs.h>.

       struct ibv_srq_init_attr_ex {
               void                   *srq_context;    /* Associated context of the SRQ */
               struct ibv_srq_attr     attr;           /* SRQ attributes */
               uint32_t                comp_mask;      /* Identifies valid fields */
               enum ibv_srq_type       srq_type;       /* Basic / XRC / tag matching */
               struct ibv_pd          *pd;             /* PD associated with the SRQ */
               struct ibv_xrcd        *xrcd;           /* XRC domain to associate with the SRQ */
               struct ibv_cq          *cq;             /* CQ to associate with the SRQ for XRC mode */
               struct ibv_tm_cap       tm_cap;         /* Tag matching attributes */
       };

       struct ibv_srq_attr {
               uint32_t                max_wr;         /* Requested max number of outstanding work requests (WRs) in the SRQ */
               uint32_t                max_sge;        /* Requested max number of scatter elements per WR */
               uint32_t                srq_limit;      /* The limit value of the SRQ */
       };

       struct ibv_tm_cap {
               uint32_t                max_num_tags;   /* Tag matching list size */
               uint32_t                max_ops;        /* Number of outstanding tag list operations */
       };


       The function ibv_create_srq_ex() will update the srq_init_attr_ex
       struct with the original values of the SRQ that was created; the values
       of max_wr and max_sge will be greater than or equal to the values
       requested.

       ibv_destroy_srq() destroys the SRQ srq.

RETURN VALUE
       ibv_create_srq_ex() returns a pointer to the created SRQ, or NULL if
       the request fails.

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

NOTES
       ibv_destroy_srq() fails if any queue pair is still associated with this
       SRQ.

SEE ALSO
       ibv_alloc_pd(3), ibv_modify_srq(3), ibv_query_srq(3)

AUTHORS
       Yishai Hadas <yishaih@mellanox.com>

libibverbs                        2013-06-26              IBV_CREATE_SRQ_EX(3)