mxge — Myricom
Myri10GE 10 Gigabit Ethernet adapter driver
To compile this driver into the kernel, place the following lines
in your kernel configuration file:
device firmware
device mxge
Alternatively, to load the driver as a module at boot time, place
the following lines in loader.conf(5):
if_mxge_load="YES"
mxge_ethp_z8e_load="YES"
mxge_eth_z8e_load="YES"
mxge_rss_ethp_z8e_load="YES"
mxge_rss_eth_z8e_load="YES"
The mxge driver provides support for PCI
Express 10 Gigabit Ethernet adapters based on the Myricom LANai Z8E chip.
The driver supports Transmit/Receive checksum offload, Jumbo Frames, TCP
segmentation offload (TSO) as well as Large Receive Offload (LRO). For
further hardware information, see
http://www.myri.com/.
For questions related to hardware requirements, refer to the
documentation supplied with your Myri10GE adapter. All hardware requirements
listed apply to use with FreeBSD.
Support for Jumbo Frames is provided via the interface MTU
setting. Selecting an MTU larger than 1500 bytes with the
ifconfig(8) utility configures the adapter to receive and
transmit Jumbo Frames. The maximum MTU size for Jumbo Frames is 9000.
For more information on configuring this device, see
ifconfig(8).
The mxge driver supports 10 Gigabit
Ethernet adapters based on the Myricom LANai Z8E chips:
- Myricom 10GBase-CX4 (10G-PCIE-8A-C, 10G-PCIE-8AL-C)
- Myricom 10GBase-R (10G-PCIE-8A-R, 10G-PCIE-8AL-R)
- Myricom 10G XAUI over ribbon fiber (10G-PCIE-8A-Q, 10G-PCIE-8AL-Q)
Tunables can be set at the loader(8) prompt
before booting the kernel or stored in loader.conf(5).
- hw.mxge.flow_control_enabled
- Whether or not hardware flow control is enabled on the adapter. The
default value is 1.
- hw.mxge.intr_coal_delay
- This value delays the generation of all interrupts in units of 1
microsecond. The default value is 30.
- hw.mxge.skip_pio_read
- This value determines whether or not the driver may omit doing a PIO read
in the interrupt handler which ensures that the interrupt line has been
deasserted when using xPIC interrupts. A non-zero value may result in
lower CPU overhead, however it may also result in spurious interrupts. The
default value is 0. This tunable has no effect when the device is using
MSI or MSI-X interrupts.
- hw.mxge.max_slices
- This value determines the maximum number of slices the driver will attempt
to use. The default value is 1. A slice is comprised of a set of receive
queues and an associated interrupt thread. When using multiple slices, the
NIC hashes traffic to different slices based on the value of
hw.mxge.rss_hashtype. Using multiple slices requires
that your motherboard and Myri10GE NIC both be capable of MSI-X. Older
Myri10GE NICs can be field upgraded to add MSI-X using the "10G NIC
Tool Kit" for FreeBSD which is available from
http://www.myri.com/scs/download-10g-tools.html.
- This value determines how incoming traffic is steered to different slices.
This tunable is ignored when using just a single slice. The legal values
for this tunable are:
- 1
- Hash on the source and destination IPv4 addresses.
- 2
- Hash on source and destination IPv4 addresses and if the packet is
TCP, then also hash on the TCP source and destination ports.
- 4
- Hash on the TCP or UDP source ports. This is the default value.
- mxge%d: Unable to allocate bus resource: memory
- A fatal initialization error has occurred.
- mxge%d: Unable to allocate bus resource: interrupt
- A fatal initialization error has occurred.
- mxge%d: Could not find firmware image %s
- The appropriate firmware kld module was not installed. This is a non-fatal
initialization error, but will result in running in a reduced performance
mode.
For general information and support, go to the Myricom support
website at: http://www.myri.com/scs/.
If an issue is identified with the released source code on the
supported kernel with a supported adapter, email the specific information
related to the issue to
<help@myri.com>.
The mxge device driver first appeared in
FreeBSD 6.3.