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 supports 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.ntxq10g
    The number of tx queues to use for a 10Gb port. The default is 16 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nrxq10g
    The number of rx queues to use for a 10Gb port. The default is 8 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.ntxq1g
    The number of tx queues to use for a 1Gb port. The default is 4 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nrxq1g
    The number of rx queues to use for a 1Gb port. The default is 2 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nofldtxq10g
    The number of TOE tx queues to use for a 10Gb port. The default is 8 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nofldrxq10g
    The number of TOE rx queues to use for a 10Gb port. The default is 2 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nofldtxq1g
    The number of TOE tx queues to use for a 1Gb port. The default is 2 or the number of CPU cores in the system, whichever is less.

hw.cxgbe.nofldrxq1g
    The number of TOE rx queues to use for a 1Gb port. The default is 1.

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. Different cxgbe interfaces can be assigned different values at any time via the dev.cxgbe.X.holdoff_tmr_idx sysctl.

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 -1 for both 10Gb and 1Gb ports, which means packet counting is disabled and interrupts are generated based solely on the holdoff timer value. Different cxgbe interfaces can be assigned different values via the dev.cxgbe.X.holdoff_pktc_idx sysctl. This sysctl works only when the interface has never been marked up (as done by ifconfig up).

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. Different cxgbe interfaces can be assigned different values via the dev.cxgbe.X.qsize_txq sysctl. This sysctl works only when the interface has never been marked up (as done by ifconfig up).

hw.cxgbe.qsize_rxq
    The size, in number of entries, of the descriptor ring used for an rx queue. The default value is 1024. Different cxgbe interfaces can be assigned different values via the dev.cxgbe.X.qsize_rxq sysctl. This sysctl works only when the interface has never been marked up (as done by ifconfig up).

hw.cxgbe.interrupt_types
    The interrupt types that the driver is allowed to use. Bit 0 represents INTx (line interrupts), bit 1 MSI, bit 2 MSI-X. The default is 7 (all allowed). The driver will select the best possible type out of the allowed types by itself.

hw.cxgbe.config_file
    Select a pre-packaged device configuration file. A configuration file contains a recipe for partitioning and configuring the hardware resources on the card. This tunable is for specialized applications only and should not be used in normal operation. The configuration profile currently in use is available in the dev.t4nex.X.cf and dev.t4nex.X.cfcsum sysctls.

hw.cxgbe.linkcaps_allowed

hw.cxgbe.niccaps_allowed

hw.cxgbe.toecaps_allowed

hw.cxgbe.rdmacaps_allowed

hw.cxgbe.iscsicaps_allowed

hw.cxgbe.fcoecaps_allowed
    Disallowing capabilities provides a hint to the driver and firmware to not reserve hardware resources for that feature. Each of these is a bit field with a bit for each sub-capability within the capability. This tunable is for specialized applications only and should not be used in normal operation. The capabilities for which hardware resources have been reserved are listed in dev.t4nex.X.*caps sysctls.

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>.