et — Agere ET1310
10/100/Gigabit Ethernet driver
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):
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).
The et driver supports Agere ET1310
10/100/Gigabit Ethernet adapters.
- 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).
The et device driver first appeared in
DragonFly 1.11. The first
FreeBSD release to include it was
FreeBSD 8.0.