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BNXT(4) Kernel Interfaces Manual BNXT(4) NAME bnxt -- Broadcom NetXtreme family 10Gb to 400Gb Ethernet driver SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: device iflib device bnxt Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_bnxt_load="YES" DESCRIPTION The bnxt driver provides support for PCIe NICs based on the Broadcom BCM573XX, BCM574XX, BCM575XX, and BCM576XX Ethernet controllers. For more information on configuring this device, see ifconfig(8). HARDWARE The bnxt driver supports the following Broadcom 10Gb to 400Gb Ethernet controllers: • Broadcom BCM57301 NetXtreme-C 10Gb Ethernet Controller • Broadcom BCM57302 NetXtreme-C 10Gb/25Gb Ethernet Controller • Broadcom BCM57304 NetXtreme-C 10Gb/25Gb/40Gb/50Gb Ethernet Con- troller • Broadcom BCM57304 NetXtreme-C Ethernet Virtual Function • Broadcom BCM57314 NetXtreme-C Ethernet Virtual Function • Broadcom BCM57402 NetXtreme-E 10Gb Ethernet Controller • Broadcom BCM57402 NetXtreme-E Ethernet Partition • Broadcom BCM57404 NetXtreme-E 10Gb/25Gb Ethernet Controller • Broadcom BCM57404 NetXtreme-E Ethernet Virtual Function • Broadcom BCM57404 NetXtreme-E Partition • Broadcom BCM57406 NetXtreme-E 10GBASE-T Ethernet Controller • Broadcom BCM57406 NetXtreme-E Partition • Broadcom BCM57407 NetXtreme-E 10GBase-T Ethernet Controller • Broadcom BCM57407 NetXtreme-E 25Gb Ethernet Controller • Broadcom BCM57407 NetXtreme-E Partition • Broadcom BCM57412 NetXtreme-E Partition • Broadcom BCM57414 NetXtreme-E Ethernet Virtual Function • Broadcom BCM57414 NetXtreme-E Partition • Broadcom BCM57416 NetXtreme-E Partition • Broadcom BCM57417 NetXtreme-E Ethernet Partition • Broadcom BCM57454 NetXtreme-E 10Gb/25Gb/40Gb/50Gb/100Gb Ethernet • Broadcom BCM57502 NetXtreme-E 10Gb/25Gb/50Gb Ethernet • Broadcom N425 BCM57504 NetXtreme-E 10Gb/25Gb Ethernet • Broadcom P425 BCM57504 NetXtreme-E 10Gb/25Gb Ethernet • Broadcom N1100 BCM57504 NetXtreme-E 10Gb/25Gb/50Gb/100Gb Ethernet • Broadcom N2100 BCM57508 Thor 10Gb/25Gb/50Gb/100Gb Ethernet • Broadcom P2100 BCM57508 Thor 10Gb/25Gb/50Gb/100Gb Ethernet • Broadcom N2200 BCM57608 Thor 2 10Gb/25Gb/50Gb/100Gb/200Gb Ethernet • Broadcom P2200 BCM57608 Thor 2 10Gb/25Gb/50Gb/100Gb/200Gb Ethernet • Broadcom N1400 BCM57608 Thor 2 25Gb/50Gb/100Gb/200Gb/400Gb Ethernet • Broadcom P1400 BCM57608 Thor 2 25Gb/50Gb/100Gb/200Gb/400Gb Ethernet SYSCTL VARIABLES These variables must be set before loading the driver, either via loader.conf(5) or through the use of kenv(1). These are provided by the iflib(4) framework, and might be better documented there. dev.bnxt.X.iflib.override_nrxds Override the number of RX descriptors for each queue. The value is a comma separated list of three positive integers: the size of the completion ring, the size of the receive ring, and the size of the aggregation ring respectively. The completion ring should be at least the size of the aggregation ring plus four times the size of the receive ring. These numbers must be powers of two, and zero means to use the default. Defaults to 0,0,0. dev.bnxt.X.iflib.override_ntxds Override the number of TX descriptors for each queue. The value is a comma separated list of two positive integers: the size of the completion ring, and the size of the transmit ring respectively. The completion ring should be at least twice the size of the transmit ring. These numbers must be powers of two, and zero means to use the default. Defaults to 0,0. dev.bnxt.X.iflib.override_qs_enable When set, allows the number of transmit and receive queues to be different. If not set, the lower of the number of TX or RX queues will be used for both. dev.bnxt.X.iflib.override_nrxqs Set the number of RX queues. If zero, the number of RX queues is derived from the number of cores on the socket connected to the controller. Defaults to 0. dev.bnxt.X.iflib.override_ntxqs Set the number of TX queues. If zero, the number of TX queues is derived from the number of cores on the socket connected to the controller. These sysctl(8) variables can be changed at any time: dev.bnxt.X.vlan_only Require that incoming frames must have a VLAN tag on them that matches one that is configured for the NIC. Normally, both frames that have a matching VLAN tag and frames that have no VLAN tag are accepted. Defaults to 0. dev.bnxt.X.vlan_strip When non-zero the NIC strips VLAN tags on receive. Defaults to 0. dev.bnxt.X.rx_stall Enable buffering rather than dropping frames when there are no available host RX buffers for DMA. Defaults to 0. dev.bnxt.X.rss_type Comma-separated list of RSS hash types to support. Default is all types. Defaults to ipv4,tcp_ipv4,udp_ipv4,ipv6,tcp_ipv6,udp_ipv6. dev.bnxt.X.rss_key Current RSS key. Defaults to a randomly generated value which is generated for each device during attach. dev.bnxt.X.ver.hwrm_min_ver Minimum HWRM (HardWare Resource Manager) firmware API to sup- port. If the firmware implements an older version, a warning will be printed, and the firmware should be upgraded. Defaults to 1.2.2. These sysctl(8) variables are read-only: dev.bnxt.X.if_name Current interface name of the device. This will normally be bnxtX, but this can be changed using ifconfig name. This sysctl allows correlating an interface with a child of dev.bnxt. dev.bnxt.X.nvram.* Information about the NVRAM device which contains the device firmware. dev.bnxt.X.ver.* Version-related information about the device and firmware: dev.bnxt.X.ver.hwrm_if Supported HWRM API version of the currently running firmware. dev.bnxt.X.ver.driver_hwrm_if HWRM API version the driver was built to support. dev.bnxt.X.hwstats.* Per-queue statistics tracked by the hardware. dev.bnxt.X.hwstats.port_stats.* Per-port statistics tracked by the hardware. dev.bnxt.X.hwstats.rxq0.drop_pkts Number of packets dropped by hardware on queue zero. This num- ber might seem high, but the count includes packets dropped due to incorrect destination MAC, unsubscribed multicast address, and other normal reasons to ignore Ethernet frames. dev.bnxt.X.hwstats.rxq0.tpa_* statistics related to HW LRO. dev.bnxt.X.hw_lro.* Enable / Disable HW LRO feature. Defaults to disable. En- abling HW LRO could cause issues when forwarding is enabled on host. dev.bnxt.X.fc Enable / Disable Flow Control feature. Defaults to Enable DIAGNOSTICS bnxt%d: %s command returned %s error. Device firmware rejected a com- mand from the driver. There might be a driver/firmware HWRM API mis- match. bnxt%d: Timeout sending %s (timeout: %d) seq %d Device firmware unre- sponsive. A PCI device reset is likely needed. bnxt%d: Timeout sending %s (timeout: %d) msg {0x%x 0x%x} len:%d v: %d Partial firmware response. A PCI device reset is likely needed. As of this writing, the system must be rebooted to initiate a PCI de- vice reset. SEE ALSO altq(4), arp(4), iflib(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8) HISTORY The bnxt device driver first appeared in FreeBSD 11.1. AUTHORS The bnxt driver was written by Jack Vogel <jfvogel@gmail.com> and Stephen Hurd <shurd@freebsd.org>, and is currently maintained by Broadcom Limited <freebsd.pdl@broadcom.com>. FreeBSD ports 15.quarterly December 10, 2025 BNXT(4)
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | SYSCTL VARIABLES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS
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