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Manual Pages  — IXL

NAME

ixl – Intel Ethernet 700 Series Driver

CONTENTS

SYNOPSIS

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

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

if_ixl_load="YES"

DESCRIPTION

Features

The ixl driver provides support for any PCI Express adapter or LOM (LAN On Motherboard) in the Intel Ethernet 700 Series. As of this writing, the series includes devices with these model numbers:

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
.Lk
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).

Additional Utilities

There are additional tools available from Intel to help configure and update the adapters covered by this driver. These tools can be downloaded directly from Intel at
.Lk
https://downloadcenter.intel.com, by searching for their names, or by installing certain packages:

HARDWARE

Most adapters in the Intel Ethernet 700 Series with SFP+/SFP28/QSFP+ cages have firmware that requires that Intel qualified modules are used; these qualified modules are listed below. This qualification check cannot be disabled by the driver.

The ixl driver supports 40Gb Ethernet adapters with these QSFP+ modules:

The ixl driver supports 25Gb Ethernet adapters with these SFP28 modules:

The ixl driver supports 25Gb and 10Gb Ethernet adapters with these SFP+ modules:

Note that adapters also support all passive and active limiting direct attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications.

This is not an exhaustive list; please consult product documentation for an up-to-date list of supported media.

LOADER TUNABLES

Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
hw.ixl.rx_itr
  The RX interrupt rate value, set to 62 (124 usec) by default.
hw.ixl.tx_itr
  The TX interrupt rate value, set to 122 (244 usec) by default.
hw.ixl.i2c_access_method
  Access method that driver will use for I2C read and writes via sysctl(8) or verbose ifconfig(8) information display:
0 - best available method
1 - bit bang via I2CPARAMS register
2 - register read/write via I2CCMD register
3 - Use Admin Queue command (default best)

Using the Admin Queue is only supported on 710 devices with FW version 1.7 or newer. Set to 0 by default.

hw.ixl.enable_tx_fc_filter
  Filter out packets with Ethertype 0x8808 from being sent out by non-adapter sources. This prevents (potentially untrusted) software or iavf(4) devices from sending out flow control packets and creating a DoS (Denial of Service) event. Enabled by default.
hw.ixl.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. Enabled by default; disable to mimic the TX behavior found in ixgbe(4).

SYSCTL PROCEDURES

dev.ixl.#.fc
  Sets the 802.3x flow control mode that the adapter will advertise on the link. A value of 0 disables flow control, 3 enables full, 1 is RX, and 2 is TX pause.

The negotiated flow control setting can be viewed in ifconfig(8), in the interface's media field.

dev.ixl.#.advertise_speed
  Set the speeds that the interface will advertise on the link. dev.ixl.#.supported_speeds contains the speeds that are allowed to be set.
dev.ixl.#.current_speed
  Displays the current speed.
dev.ixl.#.fw_version
  Displays the current firmware and NVM versions of the adapter.

INTERRUPT STORMS

It is important to note that 40G operation can generate high numbers of interrupts, often incorrectly being interpreted as a storm condition in the kernel. It is suggested that this be resolved by setting:
hw.intr_storm_threshold: 0
 

IOVCTL OPTIONS

The driver supports additional optional parameters for created VFs (Virtual Functions) when using iovctl(8):
mac-addr (unicast-mac)
  Set the Ethernet MAC address that the VF will use. If unspecified, the VF will use a randomly generated MAC address.
mac-anti-spoof (bool)
  Prevent the VF from sending Ethernet frames with a source address that does not match its own.
allow-set-mac (bool)
  Allow the VF to set its own Ethernet MAC address
allow-promisc (bool)
  Allow the VF to inspect all of the traffic sent to the port.
num-queues (uint16_t)
  Specify the number of queues the VF will have. By default, this is set to the number of MSI-X vectors supported by the VF minus one.

An up to date list of parameters and their defaults can be found by using iovctl(8) with the -S option.

SUPPORT

For general information and support, go to the Intel support website at:
.Lk
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
.Mt freebsd@intel.com .

SEE ALSO

arp(4), iavf(4), iflib(4), netintro(4), vlan(4), ifconfig(8), iovctl(8), iflib(9)

HISTORY

The ixl device driver first appeared in FreeBSD 10.1 . It was converted to use iflib(9) in FreeBSD 12 .

AUTHORS

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

IXL (4) June 27, 2020

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