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CXGBE(4)               FreeBSD Kernel Interfaces Manual               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:

     +o   Chelsio T420-CR
     +o   Chelsio T422-CR
     +o   Chelsio T440-CR
     +o   Chelsio T420-BCH
     +o   Chelsio T440-BCH
     +o   Chelsio T440-CH
     +o   Chelsio T420-SO
     +o   Chelsio T420-CX
     +o   Chelsio T420-BT
     +o   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 2
             for both 10Gb and 1Gb ports, which means 16 packets (or the
             holdoff timer going off) before an interrupt is generated.  -1
             disables packet counting.  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
     The cxgbe driver was written by Navdeep Parhar <np@FreeBSD.org>.

FreeBSD 11.0-PRERELEASE        February 14, 2011       FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SUPPORT | SEE ALSO | HISTORY | AUTHORS

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