Provided by: freebsd-manpages_12.0-1_all bug

NAME

     cxgbe — Chelsio T4-, T5-, and T6-based 100Gb, 40Gb, 25Gb, 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 lines in loader.conf(5):

           t4fw_cfg_load="YES"
           t5fw_cfg_load="YES"
           t6fw_cfg_load="YES"
           if_cxgbe_load="YES"

DESCRIPTION

     The cxgbe driver provides support for PCI Express Ethernet adapters based on the Chelsio
     Terminator 4, Terminator 5, and Terminator 6 ASICs (T4, T5, and T6).  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/.

     The cxgbe driver uses different names for devices based on the associated ASIC:

           ASIC    Port Name    Parent Device    Virtual Interface
           T4      cxgbe        t4nex            vcxgbe
           T5      cxl          t5nex            vcxl
           T6      cc           t6nex            vcc

     Loader tunables with the hw.cxgbe prefix apply to all cards.  The driver provides sysctl
     MIBs for both ports and parent devices using the names above.  For example, a T5 adapter
     provides port MIBs under dev.cxl and adapter-wide MIBs under dev.t5nex.  References to
     sysctl MIBs in the remainder of this page use dev.<port> for port MIBs and dev.<nexus> for
     adapter-wide MIBs.

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

HARDWARE

     The cxgbe driver supports 100Gb and 25Gb Ethernet adapters based on the T6 ASIC:

     ·   Chelsio T6225-CR
     ·   Chelsio T6225-SO-CR
     ·   Chelsio T62100-LP-CR
     ·   Chelsio T62100-SO-CR
     ·   Chelsio T62100-CR

     The cxgbe driver supports 40Gb, 10Gb and 1Gb Ethernet adapters based on the T5 ASIC:

     ·   Chelsio T580-CR
     ·   Chelsio T580-LP-CR
     ·   Chelsio T580-LP-SO-CR
     ·   Chelsio T560-CR
     ·   Chelsio T540-CR
     ·   Chelsio T540-LP-CR
     ·   Chelsio T522-CR
     ·   Chelsio T520-LL-CR
     ·   Chelsio T520-CR
     ·   Chelsio T520-SO
     ·   Chelsio T520-BT
     ·   Chelsio T504-BT

     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).  There are multiple tunables that control the number of queues of various
     types.  A negative value for such a tunable instructs the driver to create up to that many
     queues if there are enough CPU cores available.

     hw.cxgbe.ntxq
             Number of NIC tx queues used for a port.  The default is 16 or the number of CPU
             cores in the system, whichever is less.

     hw.cxgbe.nrxq
             Number of NIC rx queues used for a port.  The default is 8 or the number of CPU
             cores in the system, whichever is less.

     hw.cxgbe.nofldtxq
             Number of TOE tx queues used for a port.  The default is 8 or the number of CPU
             cores in the system, whichever is less.

     hw.cxgbe.nofldrxq
             Number of TOE rx queues used for a port.  The default is 2 or the number of CPU
             cores in the system, whichever is less.

     hw.cxgbe.num_vis
             Number of virtual interfaces (VIs) created for each port.  Each virtual interface
             creates a separate network interface.  The first virtual interface on each port is
             required and represents the primary network interface on the port.  Additional
             virtual interfaces on a port are named using the Virtual Interface name from the
             table above.  Additional virtual interfaces use a single pair of queues for rx and
             tx as well an additional pair of queues for TOE rx and tx.  The default is 1.

     hw.cxgbe.holdoff_timer_idx

     hw.cxgbe.holdoff_timer_idx_ofld
             Timer index value used 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.  holdoff_timer_idx_ofld applies to queues used for
             TOE rx.  The default value is 1 which means the timer value is 5us.  Different
             interfaces can be assigned different values at any time via the
             dev.<port>.X.holdoff_tmr_idx and dev.<port>.X.holdoff_tmr_idx_ofld sysctls.

     hw.cxgbe.holdoff_pktc_idx

     hw.cxgbe.holdoff_pktc_idx_ofld
             Packet-count index value used 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.
             holdoff_pktc_idx_ofld applies to queues used for TOE rx.  The default value is -1
             which means packet counting is disabled and interrupts are generated based solely on
             the holdoff timer value.  Different interfaces can be assigned different values via
             the dev.<port>.X.holdoff_pktc_idx and dev.<port>.X.holdoff_pktc_idx_ofld sysctls.
             These sysctls work only when the interface has never been marked up (as done by
             ifconfig up).

     hw.cxgbe.qsize_txq
             Number of entries in a transmit queue's descriptor ring.  A buf_ring of the same
             size is also allocated for additional software queuing.  See ifnet(9).  The default
             value is 1024.  Different interfaces can be assigned different values via the
             dev.<port>.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
             Number of entries in a receive queue's descriptor ring.  The default value is 1024.
             Different interfaces can be assigned different values via the dev.<port>.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
             Permitted interrupt types.  Bit 0 represents INTx (line interrupts), bit 1 MSI, and
             bit 2 MSI-X.  The default is 7 (all allowed).  The driver selects the best possible
             type out of the allowed types.

     hw.cxgbe.pcie_relaxed_ordering
             PCIe Relaxed Ordering.  -1 indicates the driver should determine whether to enable
             or disable PCIe RO.  0 disables PCIe RO.  1 enables PCIe RO.  2 indicates the driver
             should not modify the PCIe RO setting.  The default is -1.

     hw.cxgbe.fw_install
             0 prohibits the driver from installing a firmware on the card.  1 allows the driver
             to install a new firmware if internal driver heuristics indicate that the new
             firmware is preferable to the one already on the card.  2 instructs the driver to
             always install the new firmware on the card as long as it is compatible with the
             driver and is a different version than the one already on the card.  The default is
             1.

     hw.cxgbe.fl_pktshift
             Number of padding bytes inserted before the beginning of an Ethernet frame in the
             receive buffer.  The default value is 0.  A value of of 2 would ensure that the
             Ethernet payload (usually the IP header) is at a 4 byte aligned address.  0-7 are
             all valid values.

     hw.cxgbe.fl_pad
             A non-zero value ensures that writes from the hardware to a receive buffer are
             padded up to the specified boundary.  The default is -1 which lets the driver pick a
             pad boundary.  0 disables trailer padding completely.

     hw.cxgbe.cong_drop
             Controls the hardware response to congestion.  -1 disables congestion feedback and
             is not recommended.  0 instructs the hardware to backpressure its pipeline on
             congestion.  This usually results in the port emitting PAUSE frames.  1 instructs
             the hardware to drop frames destined for congested queues.

     hw.cxgbe.pause_settings
             PAUSE frame settings.  Bit 0 is rx_pause, bit 1 is tx_pause, bit 2 is pause_autoneg.
             rx_pause = 1 instructs the hardware to heed incoming PAUSE frames, 0 instructs it to
             ignore them.  tx_pause = 1 allows the hardware to emit PAUSE frames when its receive
             FIFO reaches a high threshold, 0 prohibits the hardware from emitting PAUSE frames.
             pause_autoneg = 1 overrides the rx_pause and tx_pause bits and instructs the
             hardware to negotiate PAUSE settings with the link peer.  The default is 7 (all
             three = 1).  This tunable establishes the default PAUSE settings for all ports.
             Settings can be displayed and controlled on a per-port basis via the
             dev.<port>.X.pause_settings sysctl.

     hw.cxgbe.fec
             FEC (Forward Error Correction) settings.  0 diables FEC.  Bit 0 enables RS FEC, bit
             1 enables BASE-R FEC (aka Firecode FEC).  The default is -1 which lets the driver
             pick a value.  This tunable establishes the default FEC settings for all ports.
             Settings can be displayed and controlled on a per-port basis via the
             dev.<port>.X.fec sysctl.

     hw.cxgbe.autoneg
             Link autonegotiation settings.  This tunable establishes the default autonegotiation
             settings for all ports.  Settings can be displayed and controlled on a per-port
             basis via the dev.<port>.X.autoneg sysctl.  0 disables autonegotiation.  1 enables
             autonegotiation.  The default is -1 which lets the driver pick a value.
             dev.<port>.X.autoneg is -1 for port and module combinations that do not support
             autonegotiation.

     hw.cxgbe.buffer_packing
             Allow the hardware to deliver multiple frames in the same receive buffer
             opportunistically.  The default is -1 which lets the driver decide.  0 or 1
             explicitly disable or enable this feature.

     hw.cxgbe.allow_mbufs_in_cluster
             1 allows the driver to lay down one or more mbufs within the receive buffer
             opportunistically.  This is the default.  0 prohibits the driver from doing so.

     hw.cxgbe.largest_rx_cluster

     hw.cxgbe.safest_rx_cluster
             Sizes of rx clusters.  Each of these must be set to one of the sizes available
             (usually 2048, 4096, 9216, and 16384) and largest_rx_cluster must be greater than or
             equal to safest_rx_cluster.  The defaults are 16384 and 4096 respectively.  The
             driver never attempts to allocate a receive buffer larger than largest_rx_cluster
             and falls back to allocating buffers of safest_rx_cluster size if an allocation
             larger than safest_rx_cluster fails.  Note that largest_rx_cluster merely
             establishes a ceiling -- the driver is allowed to allocate buffers of smaller sizes.

     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.<nexus>.X.cf and dev.<nexus>.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.<nexus>.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), ccr(4), cxgb(4), cxgbev(4), netintro(4), ng_ether(4), ifconfig(8)

HISTORY

     The cxgbe device driver first appeared in FreeBSD 9.0.  Support for T5 cards first appeared
     in FreeBSD 9.2 and FreeBSD 10.0.  Support for T6 cards first appeared in FreeBSD 11.1 and
     FreeBSD 12.0.

AUTHORS

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