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$FreeBSD: releng/11.0/share/man/man4/et.4 267938 2014-06-26 21:46:14Z bapt $
.Dd December 9, 2011 .Dt ET 4 .Os .Sh NAME .Nm et .Nd "Agere ET1310 10/100/Gigabit Ethernet driver" .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: d -ragged -offset indent .Cd "device miibus" .Cd "device et" .Ed
p
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
d -literal -offset indent if_et_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver supports PCI Express Ethernet adapters based on the Agere ET1310 chip.
.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.
p The .Nm driver supports the following media types:
p l -tag -width 10baseT/UTP -compact t autoselect Enable autoselection of the media types and options. The user can manually override the autoselected mode by adding media options to the
p t 10baseT/UTP Set 10Mbps operation. The .Ar mediaopt option can also be used to select either .Ar full-duplex or .Ar half-duplex modes.
p t 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.
p t 1000baseT Set 1000Mbps (Gigabit Ethernet) operation. The .Ar mediaopt option can only be set to .Ar full-duplex mode. .El
p The .Nm driver supports the following .Ar media options:
p l -tag -width full-duplex -compact t full-duplex Force full-duplex operation.
p t half-duplex Force half-duplex operation. .El
p 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 HARDWARE The .Nm driver supports Agere ET1310 10/100/Gigabit Ethernet adapters. .Sh TUNABLES l -tag -width ".Va hw.et.rx_intr_npkts" t 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 32. It is recommended to set this value above 38 to prevent the host from being livelocked under a high degree of stress. t 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 20. t 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 126. It is recommended to set this value below 280 to prevent the TX ring from underflowing. t Va hw.et.timer This value controls how often 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 altq 4 , .Xr arp 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 . The first .Fx release to include it was .Fx 8.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Sepherosa Ziehau Aq Mt sepherosa@gmail.com for .Dx . It was ported to .Fx by .An Xin LI Aq Mt delphij@FreeBSD.org .