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download PDF document: if_bxe.4.pdf

BXE(4) FreeBSD Kernel Interfaces Manual BXE(4)
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:
o QLogic NetXtreme II BCM57710 10Gb o QLogic NetXtreme II BCM57711 10Gb o QLogic NetXtreme II BCM57711E 10Gb o QLogic NetXtreme II BCM57712 10Gb o QLogic NetXtreme II BCM57712-MF 10Gb o QLogic NetXtreme II BCM57800 10Gb o QLogic NetXtreme II BCM57800-MF 10Gb o QLogic NetXtreme II BCM57810 10Gb o QLogic NetXtreme II BCM57810-MF 10Gb o QLogic NetXtreme II BCM57840 10Gb / 20Gb o 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 effect 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
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.#.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
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>.
FreeBSD 14.2-RELEASE April 29, 2012 FreeBSD 14.2-RELEASE