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):
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⟩.