---
name: "ibv_create_srq_ex"
section: "3"
platform: "linux"
package: "rdma-core"
version: "65.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ibv_create_srq_ex"
---

# ibv\_create\_srq\_ex(3)

create or destroy a shared receive queue (SRQ)

## 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_alloc_pd/3.md), [**ibv\_modify\_srq**(3)](/ibv_modify_srq/3.md), [**ibv\_query\_srq**(3)](/ibv_query_srq/3.md)

## AUTHORS

- Yishai Hadas \<yishaih@mellanox.com\>