NAME

       iavf — Intel Adaptive Virtual Function driver

SYNOPSIS

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

             device iflib
             device iavf

       To load the driver as a module at boot time, place the following lines in loader.conf(5):

             if_iavf_load="YES"

DESCRIPTION

       The  iavf  driver  provides support for the PCI Virtual Functions from the 700 Series of ethernet devices
       and newer product families.  The driver supports Jumbo Frames, TX/RX checksum offload,  TCP  segmentation
       offload  (TSO),  Large  Receive Offload (LRO), VLAN tag insertion/extraction, VLAN checksum offload, VLAN
       TSO, and Receive Side Steering (RSS), all for both IPv4 and IPv6.  For further hardware  information  and
       questions related to hardware requirements, see http://support.intel.com/.

       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 size for Jumbo Frames is 9706.

       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).

       NOTE: This iavf driver is only for Virtual Functions.  For 700 series Physical Functions, use the  ixl(4)
       driver.

LOADER TUNABLES

       Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).

       hw.iavf.rx_itr
               The RX interrupt rate value, set to 62 (124 usec) by default.

       hw.iavf.tx_itr
               The TX interrupt rate value, set to 122 (244 usec) by default.

       hw.iavf.enable_head_writeback
               When  the driver is finding the last TX descriptor processed by the hardware, use a value written
               to memory by the hardware instead of scanning the  descriptor  ring  for  completed  descriptors.
               Disabled  by  default;  this  mimics  the  "legacy"  TX  behavior  found  in ixgbe(4).  to ensure
               compatibility with future, non-700 series VF devices.

SUPPORT

       For general information and support, go to the Intel support website at: http://support.intel.com/.

       If an issue is identified with this driver with a supported adapter, email all the  specific  information
       related to the issue to freebsd@intel.com.

SEE ALSO

       arp(4), ixl(4), netintro(4), vlan(4), ifconfig(8), iflib(9)

HISTORY

       The  iavf  device  driver  first appeared in FreeBSD 10.1.  under the name "ixlv" It was converted to use
       iflib(9) and changed to its current name in FreeBSD 12.

AUTHORS

       The iavf driver was written by Jack Vogel <jfv@freebsd.org> and Eric Joyner <erj@freebsd.org>.

CAVEATS

       This driver is supposed to function on VFs spawned from future network devices by Intel, but at the  time
       of this writing, has only been tested on the 700 series VFs.

Debian                                          January 30, 2019                                         IAVF(4)