---
name: "mcx"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/mcx/4"
---

# mcx(4)

Mellanox 5th generation Ethernet device

## NAME

**mcx** – Mellanox 5th generation Ethernet device

## SYNOPSIS

**mcx\* at pci?**

## DESCRIPTION

The **mcx** driver supports Mellanox 5th generation Ethernet devices. Chipsets and cards in this group include:

- ConnectX-4 Lx EN

- ConnectX-4 EN

- ConnectX-5 EN

- ConnectX-6 EN

- ConnectX-6 Dx EN

- ConnectX-6 Lx EN

It supports SR-IOV virtual functions as well as physical functions.

## SEE ALSO

[arp(4)](/arp/4.md), [ifmedia(4)](/ifmedia/4.md), [intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [pci(4)](/pci/4.md), [hostname.if(5)](/hostname.if/5.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **mcx** driver first appeared in OpenBSD 6.6.

## AUTHORS

The **mcx** driver was written by Jonathan Matthew ⟨*jmatthew@openbsd.org*⟩ and David Gwynne ⟨*dlg@openbsd.org*⟩.