---
name: "ibv_query_rt_values_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_query_rt_values_ex"
---

# ibv\_query\_rt\_values\_ex(3)

query an RDMA device for some real time values

## NAME

ibv\_query\_rt\_values\_ex - query an RDMA device for some real time values

## SYNOPSIS

```
#include <infiniband/verbs.h>

int ibv_query_rt_values_ex(struct ibv_context *context,
                           struct ibv_values_ex *values);
```

## DESCRIPTION

**ibv\_query\_rt\_values\_ex()** returns certain real time values of a device *context.* The argument *attr* is a pointer to an ibv\_device\_attr\_ex struct, as defined in \<infiniband/verbs.h\>.

```
struct ibv_values_ex {
uint32_t             comp_mask;    /* Compatibility mask that defines the query/queried fields [in/out] */
struct timespec      raw_clock;    /* HW raw clock */
};
enum ibv_values_mask {
        IBV_VALUES_MASK_RAW_CLOCK = 1 << 0, /* HW raw clock */
};
```

## RETURN VALUE

**ibv\_query\_rt\_values\_ex()** returns 0 on success, or the value of errno on failure (which indicates the failure reason).

## NOTES

This extension verb only calls the provider, the provider has to query this value somehow and mark the queried values in the comp\_mask field.

## SEE ALSO

[**ibv\_query\_device**(3)](/ibv_query_device/3.md), [**ibv\_open\_device**(3)](/ibv_open_device/3.md), [**ibv\_query\_port**(3)](/ibv_query_port/3.md), [**ibv\_query\_pkey**(3)](/ibv_query_pkey/3.md), [**ibv\_query\_gid**(3)](/ibv_query_gid/3.md)

## AUTHORS

- Matan Barak \<matanb@mellanox.com\>

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