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

NAME         top

       ibv_modify_cq - modify a completion queue (CQ)

SYNOPSIS         top

       #include <infiniband/verbs.h>

       int ibv_modify_cq(struct ibv_cq *cq, struct ibv_modify_cq_attr *cq_attr);

DESCRIPTION         top

       ibv_modify_cq() modify a CQ cq.  The argument cq_attr is an
       ibv_modify_cq_attr struct, as defined in <infiniband/verbs.h>.

       struct ibv_moderate_cq {
               uint16_t cq_count;  /* number of completions per event */
               uint16_t cq_period; /* in micro seconds */

       struct ibv_modify_cq_attr {
                    uint32_t attr_mask;
                    struct ibv_moderate_cq moderate;

       The function ibv_modify_cq() will modify the CQ, based on the given

RETURN VALUE         top

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

SEE ALSO         top


AUTHORS         top

       Yonatan Cohen <>

COLOPHON         top

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libibverbs                       2017-10-20                 IBV_MODIFY_CQ(3)