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:

•   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 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 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 aggregation 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>.