VirtIO Ethernet driver
To compile this driver into the kernel, place the following lines in your kernel
Alternatively, to load the driver as a module at boot time, place the following
device driver provides support for
VirtIO Ethernet devices.
If the hypervisor advertises the appreciate features, the
driver supports TCP/UDP checksum
offload for both transmit and receive, TCP segmentation offload (TSO), TCP
large receive offload (LRO), hardware VLAN tag stripping/insertion features, a
multicast hash filter, as well as Jumbo Frames (up to 9216 bytes), which can
be configured via the interface MTU setting. Selecting an MTU larger than 1500
bytes with the
utility configures the adapter to receive and transmit Jumbo Frames.
For more information on configuring this device, see
Tunables can be set at the
prompt before booting the kernel or stored in
- This tunable disables receive and send checksum offload. The default value
- This tunable disables TSO. The default value is 0.
- This tunable disables LRO. The default value is 0.
- This tunable disables multiqueue. The default value is 0.
- This tunable sets the maximum number of transmit and receive queue pairs.
Multiple queues are only supported when the Multiqueue feature is
negotiated. This driver supports a maximum of 8 queue pairs. The number of
queue pairs used is the lesser of the maximum supported by the driver and
the hypervisor, the number of CPUs present in the guest, and this tunable
if not zero. The default value is 0.
driver was written by
It first appeared in FreeBSD 9.0
driver only supports LRO when the
hypervisor advertises the mergeable buffer feature.