NAME

iavf — Intel(R) Ethernet Adaptive Virtual Function Driver for the FreeBSD* operating system

SYNOPSIS

device iavf

DESCRIPTION

The iavf driver provides virtualization support for Intel(R) Ethernet devices based on the Intel(R) Ethernet 800 Series and Intel(R) Ethernet 700 Series.

For questions related to hardware requirements, refer to the documentation supplied with your adapter.

Support for Jumbo Frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. The maximum MTU setting for Jumbo Frames is 9706. This value coincides with the maximum Jumbo Frames size of 9728. This driver version supports VLANs. For information on enabling VLANs, see the README. NOTE that The iavf Driver is only used by means of SR-IOV, normally in a VM on a hosting server.

Offloads are also controlled via the interface, for instance, checksumming for both IPv4 and IPv6 can be set and unset, TSO4 and/or TSO6, and finally LRO can be set and unset.

For more information on configuring this device, see ifconfig(8).

LOADER TUNABLES

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). See the iflib(4). man page for more information on using iflib sysctl variables as tunables.

hw.iavf.ringsz: Set the number of descriptors in the rings. Note that this changes BOTH the TX and RX rings; they cannot be set independently. This tunable isn't available if using iflib.
hw.iavf.max_queues: Set the number of queues (each a TX/RX pair) for the port. This allows one to override the autocalculation if it's set to 0. This tunable isn't available if using iflib.
hw.iavf.txbrsz: Set the size of the buff ring used by the transmit side of the stack. We have found that it is necessary to have it quite large to get UDP to perform well.
hw.iavf.dynamic_rx_itr: The dynamic RX interrupt control. Set to 1 to enable.
hw.iavf.dynamic_tx_itr: The dynamic TX interrupt control. Set to 1 to enable.
hw.iavf.rx_itr: The RX interrupt rate value.
hw.iavf.tx_itr: The TX interrupt rate value.

SUPPORT

For additional information regarding building and installation, see the README included with the driver. For general information, go to the Intel support website at: http://www.intel.com/support/

If an issue is identified with the released source code on a supported kernel with a supported adapter, email the specific information related to the issue to freebsd@intel.com

HISTORY

The iavf device driver first appeared in FreeBSD 11.1.

AUTHORS

The iavf driver was written by Intel Corporation ⟨freebsd@intel.com⟩