---
name: "ibv_inc_rkey"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ibv_inc_rkey"
---

# ibv\_inc\_rkey(3)

## NAME

```
ibv_inc_rkey - creates a new rkey from the given one
```

## SYNOPSIS

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

uint32_t ibv_inc_rkey(uint32_t rkey);
```

## DESCRIPTION

**ibv\_inc\_rkey()** Increases the 8 LSB of *rkey* and returns the new value.

## RETURN VALUE

**ibv\_inc\_rkey()** returns the new rkey.

## NOTES

The verb generates a new rkey that is different from the previous one on its tag part but has the same index (bits 0xffffff00). A use case for this verb can be to create a new rkey from a Memory window's rkey when binding it to a Memory region.

## AUTHORS

- Majd Dibbiny \<majd@mellanox.com\>

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