xref: /dflybsd-src/share/man/man4/et.4 (revision 687c98c05ed4711616a6051aae5cff7c734fc55c)

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.\" $DragonFly: src/share/man/man4/et.4,v 1.5 2008/07/09 18:15:09 thomas Exp $
.\"
.Dd July 9, 2008
.Dt ET 4
.Os
.Sh NAME
.Nm et
.Nd "Agere ET1310 10/100/Gigabit Ethernet device"
.Sh SYNOPSIS
.Cd "device miibus"
.Cd "device et"
.Pp
Alternatively, to load the driver as a module at boot time, place the
following line in
.Pa /boot/loader.conf :
.Bd -literal -offset indent
if_et_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver supports the PCIe Ethernet adapters based on Agere ET1310.
.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 setting for Jumbo Frames is 15572.
This value coincides with the maximum Jumbo Frames size of 15594.
.Pp
The
.Nm
driver supports the following
.Ar media
types:
.Pp
.Bl -tag -width 10baseT/UTP -compact
.It Cm autoselect
Enable autoselection of the media types and options
.Pp
.It Cm 10baseT/UTP
Set 10Mbps operation.
The
.Ar mediaopt
option can also be used to select either
.Ar full-duplex
or
.Ar half-duplex
modes.
.Pp
.It Cm 100baseTX
Set 100Mbps (Fast Ethernet) operation.
The
.Ar mediaopt
option can also be used to select either
.Ar full-duplex
or
.Ar half-duplex
modes.
.Pp
.It Cm 1000baseT
Set 1000Mbps (Gigabit Ethernet) operation.
The
.Ar mediaopt
option can only be set
.Ar full-duplex
mode.
.El
.Pp
The
.Nm
driver supports the following
.Ar media
options:
.Pp
.Bl -tag -width full-duplex -compact
.It Cm full-duplex
Force full duplex operation.
.Pp
.It Cm half-duplex
Force half duplex operation.
.El
.Pp
Note that the 1000baseT media type is only available
if it is supported by the adapter.
For more information on configuring this device,
see
.Xr ifconfig 8 .
.Sh TUNABLES
.Bl -tag -width ".Va hw.et.rx_intr_npkts"
.It Va hw.et.rx_intr_npkts
This value controls how many packets should be received
before a receive interrupt is generated.
The default value is 129.
It is recommended to set this value above 38 to prevent host from being
livelocked under a high degree of stress.
.It Va hw.et.rx_intr_delay
This value delays the generation of receive interrupts
in units of ~4 microseconds.
It is used together with
.Va hw.et.rx_intr_npkts
to achieve RX interrupt moderation.
The default value is 25.
.It Va hw.et.tx_intr_nsegs
This value controls how many segments (not packets) should be transmitted
before a transmit interrupt is generated.
The default value is 256.
It is recommended to set this value below 280 to prevent TX ring from underflow.
.It Va hw.et.timer
This value controls how often the a timer interrupt should be generated.
It is used together with
.Va hw.et.tx_intr_nsegs
to achieve TX interrupt moderation.
The default value is 1000000000 (nanoseconds).
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr ifmedia 4 ,
.Xr miibus 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr vlan 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Dx 1.11 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Sepherosa Ziehau
.Aq sepherosa@gmail.com .