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

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

#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);

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.

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).

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

ibv_alloc_pd(3), ibv_modify_srq(3), ibv_query_srq(3)

2013-06-26 libibverbs