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>