VMX(4) BSD Kernel Interfaces Manual VMX(4)
vmx -- VMware VMXNET3 Virtual Interface Controller device
vmx* at pci?
The vmx driver provides support for the VMXNET3 virtual NIC available in
virtual machines by VMware. It appears as a simple Ethernet device but
is actually a virtual network interface to the underlying host operating
This driver supports the VMXNET3 driver protocol, as an alternative to
the emulated pcn(4), em(4) and the earlier VMXNET vic(4) interfaces also
available in the VMware environment. The vmx driver is optimized for the
virtual machine, it can provide advanced capabilities depending on the
underlying host operating system and the physical network interface con-
troller of the host. In comparison to the earlier VMXNET versions, as
supported by the vic(4) driver, VMXNET3 supports additional features like
multiqueue support, IPv6 checksum offloading, MSI/MSI-X support and hard-
ware VLAN tagging in VMware's VLAN Guest Tagging (VGT) mode.
The vmx driver supports VMXNET3 VMware virtual NICs provided by the vir-
tual machine hardware version 7 or newer, as provided by the following
o VMware ESX/ESXi 4.0 and newer
o VMware Server 2.0 and newer
o VMware Workstation 6.5 and newer
o VMware Fusion 2.0 and newer
The vmx driver supports the following media types:
autoselect Enable autoselection of the media type and options. The
driver always uses the fastest available speed and the media
options provided by the underlying host of the virtual
10GbaseT mediaopt full-duplex
Set 10Gbps operation.
1000baseT mediaopt full-duplex
Set 1000Mbps operation.
For more information on configuring this device, see ifconfig(8).
The following entry must be added to the VMware configuration file to
provide the vmx device:
ethernet0.virtualDev = "vmxnet3"
arp(4), em(4), ifmedia(4), intro(4), netintro(4), pci(4), pcn(4), vic(4),
The vmx driver was written by Tsubai Masanari.
BSD May 31, 2013 BSD