freebsd-skq/share/man/man4/mxge.4
2007-01-30 08:17:45 +00:00

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.\" Copyright (c) 2006, Myricom Inc
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.Dd September 15, 2006
.Dt MXGE 4
.Os
.Sh NAME
.Nm mxge
.Nd "Myricom Myri10GE 10 Gigabit Ethernet adapter driver"
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device firmware"
.Cd "device mxge"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following lines in
.Xr loader.conf 5 :
.Bd -literal -offset indent
if_mxge_load="YES"
mxge_ethp_z8e_load="YES"
mxge_eth_z8e_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
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 as well as TCP segmentation offload (TSO).
For further hardware information, see
.Pa http://www.myri.com/ .
.Pp
For questions related to hardware requirements,
refer to the documentation supplied with your Myri10GE adapter.
All hardware requirements listed apply to use with
.Fx .
.Pp
Support for Jumbo Frames is provided via the interface MTU setting.
Selecting an MTU larger than 1500 bytes with the
.Xr ifconfig 8
utility configures the adapter to receive and transmit Jumbo Frames.
The maximum MTU size for Jumbo Frames is 9000.
.Pp
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh HARDWARE
The
.Nm
driver supports 10 Gigabit Ethernet adapters based on the
Myricom LANai Z8E chips:
.Pp
.Bl -bullet -compact
.It
Myricom 10GBase-CX4 (10G-PCIE-8A-C, 10G-PCIE-8AL-C)
.It
Myricom 10GBase-R (10G-PCIE-8A-R, 10G-PCIE-8AL-R)
.It
Myricom 10G XAUI over ribbon fiber (10G-PCIE-8A-Q, 10G-PCIE-8AL-Q)
.El
.Sh LOADER TUNABLES
Tunables can be set at the
.Xr loader 8
prompt before booting the kernel or stored in
.Xr loader.conf 5 .
.Bl -tag -width indent
.It Va hw.mxge.flow_control_enabled
Whether or not hardware flow control is enabled on the adapter.
The default value is 1.
.It Va hw.mxge.intr_coal_delay
This value delays the generation of all interrupts in units of
1 microsecond.
The default value is 30.
.It Va 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.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "mxge%d: Unable to allocate bus resource: memory"
A fatal initialization error has occurred.
.It "mxge%d: Unable to allocate bus resource: interrupt"
A fatal initialization error has occurred.
.It "mxge%d: Could not find firmware image %s"
The appropriate firmware kld module was not installed.
This is a fatal initialization error.
.El
.Sh SUPPORT
For general information and support,
go to the Myricom support website at:
.Pa http://www.myri.com/scs/ .
.Pp
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
.Aq help@myri.com .
.Sh SEE ALSO
.Xr altq 4 ,
.Xr arp 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 7.0 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Andrew Gallatin Aq gallatin@FreeBSD.org .