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IAVF(4)			 BSD Kernel Interfaces Manual		       IAVF(4)

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 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.  Se-
     lecting an	MTU larger than	1500 bytes with	the ifconfig(8)	utility	con-
     figures 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, checksum-
     ming 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 in-
	     stead 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.

BSD				October	5, 2018				   BSD

NAME | SYNOPSIS | DESCRIPTION | LOADER TUNABLES | SUPPORT | SEE ALSO | HISTORY | AUTHORS | CAVEATS

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