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EM(4) |
FreeBSD Kernel Interfaces Manual |
EM(4) |
em —
Intel(R) PRO/1000 Gigabit Ethernet adapter driver
To compile this driver into the kernel, place the following lines in your kernel
configuration file:
device iflib
device em
Alternatively, to load the driver as a module at boot time, place
the following line in
loader.conf(5):
The em driver provides support for PCI Gigabit Ethernet
adapters based on the Intel 82540, 82541ER, 82541PI, 82542, 82543, 82544,
82545, 82546, 82546EB, 82546GB, 82547, 82571, 81572, 82573, and 82574 Ethernet
controller chips.
The em driver also provides support for
PCI Express Gigabit Ethernet adapters based on the Intel 82575, 82576,
82580, i21x and i35x.
The driver supports Transmit/Receive checksum offload and Jumbo
Frames on all but 82542-based adapters.
Furthermore it supports TCP segmentation offload (TSO) on all
adapters but those based on the 82543, 82544 and 82547 controller chips. The
identification LEDs of the adapters supported by the
em driver can be controlled via the
led(4) API
for localization purposes. For further hardware information, see the
README included with the driver.
For questions related to hardware requirements, refer to the
documentation supplied with your Intel PRO/1000 adapter. All hardware
requirements listed apply to use with FreeBSD.
Support for Jumbo Frames is provided via the interface MTU
setting. Selecting an MTU larger than 1500 bytes with the
ifconfig(8)
utility configures the adapter to receive and transmit Jumbo Frames. The
maximum MTU size for Jumbo Frames is 16114.
This driver supports hardware assisted VLANs. The
em driver supports the following media types:
autoselect
- Enables auto-negotiation for speed and duplex.
10baseT/UTP
- Sets 10Mbps operation. Use the
mediaopt option to
select full-duplex mode.
100baseTX
- Sets 100Mbps operation. Use the
mediaopt option to
select full-duplex mode.
1000baseSX
- Sets 1000Mbps operation. Only
full-duplex mode is
supported at this speed.
1000baseTX
- Sets 1000Mbps operation. Only
full-duplex mode is
supported at this speed.
The em driver supports the following media
options:
full-duplex
- Forces full-duplex operation
half-duplex
- Forces half-duplex operation.
Only use mediaopt to set the driver to
full-duplex . If mediaopt is
not specified, the driver defaults to
half-duplex .
For more information on configuring this device, see
ifconfig(8).
The em driver supports Gigabit Ethernet adapters based
on the Intel 82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546,
82546EB, 82546GB, 82547, 82571, 82572, 82573, 82574, 82575, 82576, and 82580
controller chips:
- Intel Gigabit ET Dual Port Server Adapter (82576)
- Intel Gigabit VT Quad Port Server Adapter (82575)
- Intel Single, Dual and Quad Gigabit Ethernet Controller (82580)
- Intel i210 and i211 Gigabit Ethernet Controller
- Intel i350 and i354 Gigabit Ethernet Controller
- Intel PRO/1000 CT Network Connection (82547)
- Intel PRO/1000 F Server Adapter (82543)
- Intel PRO/1000 Gigabit Server Adapter (82542)
- Intel PRO/1000 GT Desktop Adapter (82541PI)
- Intel PRO/1000 MF Dual Port Server Adapter (82546)
- Intel PRO/1000 MF Server Adapter (82545)
- Intel PRO/1000 MF Server Adapter (LX) (82545)
- Intel PRO/1000 MT Desktop Adapter (82540)
- Intel PRO/1000 MT Desktop Adapter (82541)
- Intel PRO/1000 MT Dual Port Server Adapter (82546)
- Intel PRO/1000 MT Quad Port Server Adapter (82546EB)
- Intel PRO/1000 MT Server Adapter (82545)
- Intel PRO/1000 PF Dual Port Server Adapter (82571)
- Intel PRO/1000 PF Quad Port Server Adapter (82571)
- Intel PRO/1000 PF Server Adapter (82572)
- Intel PRO/1000 PT Desktop Adapter (82572)
- Intel PRO/1000 PT Dual Port Server Adapter (82571)
- Intel PRO/1000 PT Quad Port Server Adapter (82571)
- Intel PRO/1000 PT Server Adapter (82572)
- Intel PRO/1000 T Desktop Adapter (82544)
- Intel PRO/1000 T Server Adapter (82543)
- Intel PRO/1000 XF Server Adapter (82544)
- Intel PRO/1000 XT Server Adapter (82544)
Tunables can be set at the
loader(8)
prompt before booting the kernel or stored in
loader.conf(5).
- hw.em.disable_crc_stripping
- Disable or enable hardware stripping of CRC field. This is mostly useful
on BMC/IPMI shared interfaces where stripping the CRC causes remote access
over IPMI to fail. Default 0 (enabled).
- hw.em.eee_setting
- Disable or enable Energy Efficient Ethernet. Default 1 (disabled).
- hw.em.msix
- Enable or disable MSI-X style interrupts. Default 1 (enabled).
- hw.em.smart_pwr_down
- Enable or disable smart power down features on newer adapters. Default 0
(disabled).
- hw.em.sbp
- Show bad packets when in promiscuous mode. Default 0 (off).
- hw.em.rxd
- Number of receive descriptors allocated by the driver. The default value
is 1024 for adapters newer than 82547, and 256 for older ones. The 82542
and 82543-based adapters can handle up to 256 descriptors, while others
can have up to 4096.
- hw.em.txd
- Number of transmit descriptors allocated by the driver. The default value
is 1024 for adapters newer than 82547, and 256 for older ones. The 82542
and 82543-based adapters can handle up to 256 descriptors, while others
can have up to 4096.
- hw.em.rx_int_delay
- This value delays the generation of receive interrupts in units of 1.024
microseconds. The default value is 0, since adapters may hang with this
feature being enabled.
- hw.em.rx_abs_int_delay
- If hw.em.rx_int_delay is non-zero, this tunable
limits the maximum delay in which a receive interrupt is generated.
- hw.em.tx_int_delay
- This value delays the generation of transmit interrupts in units of 1.024
microseconds. The default value is 64.
- hw.em.tx_abs_int_delay
- If hw.em.tx_int_delay is non-zero, this tunable
limits the maximum delay in which a transmit interrupt is generated.
- /dev/led/em*
- identification LED device nodes
Make the identification LED of em0 blink:
echo f2 >
/dev/led/em0
Turn the identification LED of em0 off again:
echo 0 > /dev/led/em0
- em%d: Unable to allocate bus resource: memory
- A fatal initialization error has occurred.
- em%d: Unable to allocate bus resource: interrupt
- A fatal initialization error has occurred.
- em%d: watchdog timeout -- resetting
- The device has stopped responding to the network, or there is a problem
with the network connection (cable).
For general information and support, go to the Intel support website at:
http://support.intel.com.
If an issue is identified with the released source code on the
supported kernel with a supported adapter, email the specific information
related to the issue to
<freebsd@intel.com>.
The em device driver first appeared in
FreeBSD 4.4. em was merged
with the igb device driver and converted to the iflib framework in
FreeBSD 12.0.
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