---
name: "if_ixlv"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "11.0-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/if_ixlv"
---

# if\_ixlv(4freebsd)

Intel XL710 Ethernet 40Gb VF driver

## NAME

**ixlv** – Intel XL710 Ethernet 40Gb VF driver

## SYNOPSIS

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

**device ixlv**

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

```
if_ixlv_load="YES"
```

## DESCRIPTION

The **ixlv** driver provides virtualization support for PCI Express adapters or LOMs in the XL710 Family of ethernet devices. 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)](/ifconfig/8.md) 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)](/ifconfig/8.md).

*NOTE*: The **ixlv** driver is only used by means of SRIOV, normally in a VM on a hosting server with the [ixl(4)](/ixl/4.md) driver.

## LOADER TUNABLES

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

- *hw.ixlv.ringsz*

  Set the number of descriptors in the rings, note that this changes BOTH the TX and RX rings, they cannot be set independently.

- *hw.ixlv.max\_queues*

  Set the number of queues (each a TX/RX pair) for the port, this allows one to override the autocalculation if it is set to 0.

- *hw.ixlv.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 in order to get UDP to perform well.

- *hw.ixlv.dynamic\_rx\_itr*

  The dynamic RX interrupt control, set to 1 to enable, off by default.

- *hw.ixlv.dynamic\_tx\_itr*

  The dynamic TX interrupt control, set to 1 to enable, off by default.

- *hw.ixlv.rx\_itr*

  The RX interrupt rate value, set to 8K by default.

- *hw.ixlv.tx\_itr*

  The TX interrupt rate value, set to 4K by default.

## 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)](/arp/4.md), [ixl(4)](/ixl/4.md), [netintro(4)](/netintro/4.md), [ng\_ether(4)](/ng_ether/4.md), [vlan(4)](/vlan/4.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **ixlv** device driver first appeared in FreeBSD 10.1.

## AUTHORS

The **ixlv** driver was written by Jack Vogel ⟨*jfv@FreeBSD.org*⟩ and Eric Joyner ⟨*ricera10@gmail.com*⟩.