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  option  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 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.

       hw.et.rx_intr_delay  This value delays the generation of receive interrupts in units of ~4  microseconds.
                            It  is  used  together  with hw.et.rx_intr_npkts to achieve RX interrupt 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 recommended 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 moderation.  The default
                            value is 1000000000 (nanoseconds).

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>.

Debian                                          December 9, 2011                                           ET(4)