NAME

     ixl — Intel XL710 Ethernet 40Gb Base driver

SYNOPSIS

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

           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

     The ixl driver provides 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) 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).

HARDWARE

     The ixl driver supports these SFP+ Pluggable Optics:

     •   Intel TRIPLE RATE 1G/10G/40G QSFP+ SR (bailed) E40GQSFPSR
     •   Intel TRIPLE RATE 1G/10G/40G QSFP+ SR (bailed) E40GQSFPLR

     The ixl driver supports 10Gb and 1Gb Ethernet adapters with SR Modules:

     •   Intel DUAL RATE 1G/10G SFP+ SR (bailed) FTLX8571D3BCV-IT
     •   Intel DUAL RATE 1G/10G SFP+ SR (bailed) AFBR-703SDZ-IN2

     The ixl driver supports 10Gb and 1Gb Ethernet adapters with LR Modules:

     •   Intel DUAL RATE 1G/10G SFP+ LR (bailed) FTLX1471D3BCV-IT
     •   Intel DUAL RATE 1G/10G SFP+ LR (bailed) AFCT-701SDZ-IN2

     Note that X710/XL710 Based SFP+ adapters also support all passive and active limiting direct
     attach cables that comply with SFF-8431 v4.1 and SFF-8472 v10.4 specifications.

LOADER TUNABLES

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

     hw.ixl.enable_msix
             Allows one to enable/disable MSIX, thus forcing MSI instead.

     hw.ixl.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.ixl.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.ixl.dynamic_rx_itr
             The dynamic RX interrupt control, set to 1 to enable.

     hw.ixl.dynamic_tx_itr
             The dynamic TX interrupt control, set to 1 to enable.

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

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

SYSCTL PROCEDURES

     hw.ixl.fc
             Allows one to set the flow control value.  A value of 0 disables flow control, 3
             enables full, 1 is RX, and 2 is TX pause.

     hw.ixl.advertise_speed
             Allows one to set advertised link speeds, this will then cause a link renegotiation.
             With the appropriate adapter this can cause a link at 10GB, 1GB, or 100MB.

     hw.ixl.current_speed
             This is a display of the current setting.

     hw.ixl.fw_version
             This is a display of the Firmware version.

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

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), ixlv(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)

HISTORY

     The ixl device driver first appeared in FreeBSD 10.1.

AUTHORS

     The ixl driver was written by Jack Vogel <jfv@FreeBSD.org> and Eric Joyner
     <ricera10@gmail.com>.