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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"
The cxgbe driver uses different names for devices based on the associated ASIC:
|ASIC||Port Name||Parent Device||Virtual Interface|
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).
The cxgbe driver supports 40Gb, 10Gb and 1Gb Ethernet adapters based on the T5 ASIC:
The cxgbe driver supports 10Gb and 1Gb Ethernet adapters based on the T4 ASIC:
|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.|
|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.|
|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.|
|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.|
|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.|
|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.|
|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).|
|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).|
|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).|
|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.|
|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.|
|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.|
|Number of padding bytes inserted before the beginning of an Ethernet frame in the receive buffer. The default value of 2 ensures that the Ethernet payload (usually the IP header) is at a 4 byte aligned address. 0-7 are all valid values.|
|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.|
|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.|
|PAUSE frame settings. Bit 0 is rx_pause, bit 1 is tx_pause. 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. The default is 3 (both rx_pause and tx_pause = 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.|
|FEC (Forward Error Correction) settings. 0 diables FEC. Bit 0 enables RS FEC, bit 1 enables BASE-R RS, bit 3 is reserved. 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.|
|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.|
|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.|
|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.|
|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.|
|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.|
|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.|
If an issue is identified with this driver with a supported adapter, email all the specific information related to the issue to <Mt firstname.lastname@example.org>.
|CXGBE (4)||December 22, 2016|
|Main index||Section 4||Options|
Please direct any comments about this manual page service to Ben Bullock.
|“||A typical Unix /bin or /usr/bin directory contains a hundred different kinds of programs, written by dozens of egotistical programmers, each with its own syntax, operating paradigm, rules of use ... strategies for specifying options, and different sets of constraints.||”|
|— The Unix Haters' handbook|