Provided by: freebsd-manpages_12.0-1_all 
NAME
bxe — QLogic NetXtreme II Ethernet 10Gb PCIe adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel
configuration file:
device bxe
Alternatively, to load the driver as a module at boot time, place the following line in
loader.conf(5):
if_bxe_load="YES"
DESCRIPTION
The bxe driver provides support for PCIe 10Gb Ethernet adapters based on the QLogic
NetXtreme II family of 10Gb chips. The driver supports Jumbo Frames, VLAN tagging, checksum
offload (IPv4, TCP, UDP, IPv6-TCP, IPv6-UDP), MSI-X interrupts, TCP Segmentation Offload
(TSO), Large Receive Offload (LRO), and Receive Side Scaling (RSS).
HARDWARE
The bxe driver provides support for various NICs based on the QLogic NetXtreme II family of
10Gb Ethernet controller chips, including the following:
• QLogic NetXtreme II BCM57710 10Gb
• QLogic NetXtreme II BCM57711 10Gb
• QLogic NetXtreme II BCM57711E 10Gb
• QLogic NetXtreme II BCM57712 10Gb
• QLogic NetXtreme II BCM57712-MF 10Gb
• QLogic NetXtreme II BCM57800 10Gb
• QLogic NetXtreme II BCM57800-MF 10Gb
• QLogic NetXtreme II BCM57810 10Gb
• QLogic NetXtreme II BCM57810-MF 10Gb
• QLogic NetXtreme II BCM57840 10Gb / 20Gb
• QLogic NetXtreme II BCM57840-MF 10Gb
CONFIGURATION
There a number of configuration parameters that can be set to tweak the driver's behavior.
These parameters can be set via the loader.conf(5) file to take affect during the next
system boot. The following parameters affect ALL instances of the driver.
hw.bxe.debug
DEFAULT = 0
Sets the default logging level of the driver. See the Diagnostics and Debugging
section below for more details.
hw.bxe.interrupt_mode
DEFAULT = 2
Sets the default interrupt mode: 0=IRQ, 1=MSI, 2=MSIX. If set to MSIX and
allocation fails, the driver will roll back and attempt MSI allocation. If MSI
allocation fails, the driver will roll back and attempt fixed level IRQ allocation.
If IRQ allocation fails, then the driver load fails. With MSI/MSIX, the driver
attempts to allocate a vector for each queue in addition to one more for default
processing.
hw.bxe.queue_count
DEFAULT = 4
Sets the default number of fast path packet processing queues. Note that one
MSI/MSIX interrupt vector is allocated per-queue.
hw.bxe.max_rx_bufs
DEFAULT = 0
Sets the maximum number of receive buffers to allocate per-queue. Zero(0) means to
allocate a receive buffer for every buffer descriptor. By default this equates to
4080 buffers per-queue which is the maximum value for this config parameter.
hw.bxe.hc_rx_ticks
DEFAULT = 25
Sets the number of ticks for host interrupt coalescing in the receive path.
hw.bxe.hc_tx_ticks
DEFAULT = 50
Sets the number of ticks for host interrupt coalescing in the transmit path.
hw.bxe.rx_budget
DEFAULT = 0xffffffff
Sets the maximum number of receive packets to process in an interrupt. If the
budget is reached then the remaining/pending packets will be processed in a
scheduled taskqueue.
hw.bxe.max_aggregation_size
DEFAULT = 32768
Sets the maximum LRO aggregration byte size. The higher the value the more packets
the hardware will aggregate. Maximum is 65K.
hw.bxe.mrrs
DEFAULT = -1
Sets the PCI MRRS: -1=Auto, 0=128B, 1=256B, 2=512B, 3=1KB
hw.bxe.autogreeen
DEFAULT = 0
Set AutoGrEEEN: 0=HW_DEFAULT, 1=FORCE_ON, 2=FORCE_OFF
hw.bxe.udp_rss
DEFAULT = 0
Enable/Disable 4-tuple RSS for UDP: 0=DISABLED, 1=ENABLED
Special care must be taken when modifying the number of queues and receive buffers. FreeBSD
imposes a limit on the maximum number of mbuf(9) allocations. If buffer allocations fail,
the interface initialization will fail and the interface will not be usable. The driver
does not make a best effort for buffer allocations. It is an all or nothing effort.
You can tweak the mbuf(9) allocation limit using sysctl(8) and view the current usage with
netstat(1) as follows:
# netstat -m
# sysctl kern.ipc.nmbclusters
# sysctl kern.ipc.nmbclusters=<#>
There are additional configuration parameters that can be set on a per-instance basis to
dynamically override the default configuration. The '#' below must be replaced with the
driver instance / interface unit number:
dev.bxe.#.debug
DEFAULT = 0
Sets the default logging level of the driver instance. See hw.bxe.debug above and
the Diagnostics and Debugging section below for more details.
dev.bxe.#.rx_budget
DEFAULT = 0xffffffff
Sets the maximum number of receive packets to process in an interrupt for the driver
instance. See hw.bxe.rx_budget above for more details.
Additional items can be configured using ifconfig(8):
MTU - Maximum Transmission Unit
DEFAULT = 1500
RANGE = 46-9184
# ifconfig bxe# mtu <n>
Promiscuous Mode
DEFAULT = OFF
# ifconfig bxe# [ promisc | -promisc ]
Rx/Tx Checksum Offload
DEFAULT = RX/TX CSUM ON
Note that the Rx and Tx settings are not independent.
# ifconfig bxe# [ rxcsum | -rxcsum | txcsum | -txcsum ]
TSO - TCP Segmentation Offload
DEFAULT = ON
# ifconfig bxe# [ tso | -tso | tso6 | -tso6 ]
LRO - TCP Large Receive Offload
DEFAULT = ON
# ifconfig bxe# [ lro | -lro ]
DIAGNOSTICS AND DEBUGGING
There are many statistics exposed by bxe via sysctl(8).
To dump the default driver configuration:
# sysctl -a | grep hw.bxe
To dump every instance's configuration and detailed statistics:
# sysctl -a | grep dev.bxe
To dump information for a single instance (replace the '#' with the driver instance /
interface unit number):
# sysctl -a | grep dev.bxe.#
To dump information for all the queues of a single instance:
# sysctl -a | grep dev.bxe.#.queue
To dump information for a single queue of a single instance (replace the additional '#' with
the queue number):
# sysctl -a | grep dev.bxe.#.queue.#
The bxe driver has the ability to dump a ton of debug messages to the system log. The
default level of logging can be set with the hw.bxe.debug sysctl(8). Take care with this
setting as it can result in too many logs being dumped. Since this parameter is the default
one, it affects every instance and will dramatically change the timing in the driver. A
better alternative to aid in debugging is to dynamically change the debug level of a
specific instance with the dev.bxe.#.debug sysctl(8). This allows you to turn on/off
logging of various debug groups on-the-fly.
The different debug groups that can be toggled are:
DBG_LOAD 0x00000001 /* load and unload */
DBG_INTR 0x00000002 /* interrupt handling */
DBG_SP 0x00000004 /* slowpath handling */
DBG_STATS 0x00000008 /* stats updates */
DBG_TX 0x00000010 /* packet transmit */
DBG_RX 0x00000020 /* packet receive */
DBG_PHY 0x00000040 /* phy/link handling */
DBG_IOCTL 0x00000080 /* ioctl handling */
DBG_MBUF 0x00000100 /* dumping mbuf info */
DBG_REGS 0x00000200 /* register access */
DBG_LRO 0x00000400 /* lro processing */
DBG_ASSERT 0x80000000 /* debug assert */
DBG_ALL 0xFFFFFFFF /* flying monkeys */
For example, to debug an issue in the receive path on bxe0:
# sysctl dev.bxe.0.debug=0x22
When finished turn the logging back off:
# sysctl dev.bxe.0.debug=0
SUPPORT
For support questions please contact your QLogic approved reseller or QLogic Technical
Support at http://support.qlogic.com, or by E-mail at ⟨support@qlogic.com⟩.
SEE ALSO
netstat(1), altq(4), arp(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)
HISTORY
The bxe device driver first appeared in FreeBSD 9.0.
AUTHORS
The bxe driver was written by Eric Davis <edavis@broadcom.com>,
David Christensen <davidch@broadcom.com>, and
Gary Zambrano <zambrano@broadcom.com>.