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ET(4)			 BSD Kernel Interfaces Manual			 ET(4)

NAME
     et	-- Agere ET1310	10/100/Gigabit Ethernet	driver

SYNOPSIS
     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device et

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):

	   if_et_load="YES"

DESCRIPTION
     The et driver supports PCI	Express	Ethernet adapters based	on the Agere
     ET1310 chip.

     The et driver supports the	following media	types:

     autoselect	  Enable autoselection of the media types and options.	The
		  user can manually override the autoselected mode by adding
		  media	options	to the /etc/rc.conf file.

     10baseT/UTP  Set 10Mbps operation.	 The mediaopt option can also be used
		  to select either full-duplex or half-duplex modes.

     100baseTX	  Set 100Mbps (Fast Ethernet) operation.  The mediaopt option
		  can also be used to select either full-duplex	or half-duplex
		  modes.

     1000baseT	  Set 1000Mbps (Gigabit	Ethernet) operation.  The mediaopt op-
		  tion can only	be set to full-duplex mode.

     The et driver supports the	following media	options:

     full-duplex  Force	full-duplex operation.

     half-duplex  Force	half-duplex operation.

     Note that the 1000baseT media type	is only	available if it	is supported
     by	the adapter.  For more information on configuring this device, see
     ifconfig(8).

HARDWARE
     The et driver supports Agere ET1310 10/100/Gigabit	Ethernet adapters.

TUNABLES
     hw.et.rx_intr_npkts  This value controls how many packets should be re-
			  ceived 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	live-
			  locked under a high degree of	stress.

     hw.et.rx_intr_delay  This value delays the	generation of receive inter-
			  rupts	in units of ~4 microseconds.  It is used to-
			  gether with hw.et.rx_intr_npkts to achieve RX	inter-
			  rupt moderation.  The	default	value is 20.

     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 recom-
			  mended to set	this value below 280 to	prevent	the TX
			  ring from underflowing.

     hw.et.timer	  This value controls how often	a timer	interrupt
			  should be generated.	It is used together with
			  hw.et.tx_intr_nsegs to achieve TX interrupt modera-
			  tion.	 The default value is 1000000000 (nanosec-
			  onds).

SEE ALSO
     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4),
     ifconfig(8)

HISTORY
     The et device driver first	appeared in DragonFly 1.11.  The first FreeBSD
     release to	include	it was FreeBSD 8.0.

AUTHORS
     The et driver was written by Sepherosa Ziehau <sepherosa@gmail.com> for
     DragonFly.	 It was	ported to FreeBSD by Xin LI <delphij@FreeBSD.org>.

BSD			       December	9, 2011				   BSD

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | TUNABLES | SEE ALSO | HISTORY | AUTHORS

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