---
name: "mlx4en"
section: "4"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["freebsd"]
url: "https://new.carta.tech/mlx4en"
---

# mlx4en(4)

Mellanox ConnectX-3 10GbE/40GbE network adapter driver

## NAME

**mlx4en** – Mellanox ConnectX-3 10GbE/40GbE network adapter driver

## SYNOPSIS

To compile this driver into the kernel, place these lines in your kernel configuration file:

**options COMPAT\_LINUXKPI** **device mlx4** **device mlx4en**

To load the driver as a module at run-time, run this command as root:

```
kldload mlx4en
```

To load the driver as a module at boot time, place this line in [loader.conf(5)](/loader.conf/5.md):

```
mlx4en_load="YES"
```

## DESCRIPTION

Mellanox ConnectX adapter cards with Virtual Protocol Interconnect (VPI) provide the highest performing and most flexible interconnect solution for Enterprise Data Centers, High-Performance Computing, and Embedded environments. Clustered data bases, parallelized applications, transactional services and high-performance embedded I/O applications will achieve significant performance improvements resulting in reduced completion time and lower cost per operation.

## HARDWARE

The **mlx4en** driver supports the following network adapters:

- Mellanox ConnectX-2 (ETH)

- Mellanox ConnectX-3 (ETH)

## SUPPORT

For general information and support, go to the Mellanox support website at: **http://www.mellanox.com/**.

If an issue is identified with this driver and a supported network adapter, please email the specific information to ⟨*freebsd-drivers@mellanox.com*⟩.

## SEE ALSO

[mlx4ib(4)](/mlx4ib/4.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **mlx4en** device driver first appeared in FreeBSD 9.0.

## AUTHORS

The **mlx4en** driver was written by Mellanox Technologies \<freebsd-drivers@mellanox.com\>.