CXGBE(4)

NAME
cxgbe - Chelsio T4 10Gb and 1Gb Ethernet adapter driver

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

device cxgbe

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

    if_cxgbe_load="YES"

DESCRIPTION
The cxgbe driver provides support for PCI Express Ethernet adapters based on the Chelsio Terminator 4 (T4) ASIC. The driver supprts Jumbo Frames, Transmit/Receive checksum offload, TCP segmentation offload (TSO), Large Receive Offload (LRO), VLAN tag insertion/extraction, VLAN checksum offload, VLAN TSO, and Receive Side Steering (RSS). For further hardware information and questions related to hardware requirements, see http://www.chelsio.com/.

For more information on configuring this device, see ifconfig(8).

HARDWARE
The cxgbe driver supports 10Gb and 1Gb Ethernet adapters based on the T4 ASIC:

•   Chelsio T420-CR
•   Chelsio T422-CR
•   Chelsio T440-CR
•   Chelsio T420-BCH
•   Chelsio T440-BCH
•   Chelsio T440-CH
•   Chelsio T420-SO
•   Chelsio T420-CX
•   Chelsio T420-BT
•   Chelsio T404-BT

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

hw.cxgbe.max_ntxq_10G_port
    The maximum number of tx queues to use for a 10Gb port. The default value is 8.

hw.cxgbe.max_nrxq_10G_port
    The maximum number of rx queues to use for a 10Gb port. The default value is 8.

hw.cxgbe.max_ntxq_1G_port
    The maximum number of tx queues to use for a 1Gb port. The default value is 2.

hw.cxgbe.max_nrxq_1G_port
    The maximum number of rx queues to use for a 1Gb port. The default value is 2.

hw.cxgbe.holdoff_timer_idx_10G

hw.cxgbe.holdoff_timer_idx_1G
    The timer index value to use to delay interrupts. The holdoff timer list has the values 1, 5, 10, 50, 100, and 200 by default (all values are in microseconds) and the index selects a value from this list. The default value is 1 for both 10Gb and 1Gb ports, which means the timer value is 5us.

hw.cxgbe.holdoff_pktc_idx_10G

hw.cxgbe.holdoff_pktc_idx_1G
    The packet-count index value to use to delay interrupts. The packet-count list has the values 1, 8, 16, and 32 by default and the index selects a value from this list. The default value is 2 for both 10Gb and 1Gb ports, which means 16 packets (or the holdoff timer going off) before an interrupt is generated.

hw.cxgbe.qsize_txq
    The size, in number of entries, of the descriptor ring used for a tx queue. A buf_ring of the same size is also allocated for additional software queuing. See ifnet(9). The default value is 1024.

hw.cxgbe.qsize_rxq
    The size, in number of entries, of the descriptor ring used for an rx queue. The default value is 1024.

SUPPORT
For general information and support, go to the Chelsio support website at: http://www.chelsio.com/.

If an issue is identified with this driver with a supported adapter, email all the specific information related to the issue to <support@chelsio.com>.

SEE ALSO
altq(4), arp(4), cxgb(4), netintro(4), ng_ether(4), ifconfig(8)

HISTORY
The cxgbe device driver first appeared in FreeBSD 9.0

AUTHORS
-nosplit The cxgbe driver was written by Navdeep Parhar <np@FreeBSD.org>.