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    The following form allows you to view linux man pages.

    Command:

    em

    
         kernel configuration file:
    
               device em
    
         Alternatively, to load the driver as a module at boot time, place the
         following line in loader.conf(5):
    
               if_em_load="YES"
    
    
    

    DESCRIPTION

         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 con-
         troller chips.  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 documenta-
         tion supplied with your Intel PRO/1000 adapter.  All hardware require-
         ments 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 con-
         figures the adapter to receive and transmit Jumbo Frames.  The maximum
         MTU size for Jumbo Frames is 16114.
    
         This driver version supports 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.
         ?   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)
    
    
    

    LOADER TUNABLES

         Tunables can be set at the loader(8) prompt before booting the kernel or
         stored in loader.conf(5).
    
         hw.em.rxd
                 Number of receive descriptors allocated by the driver.  The
                 default value is 256.  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 256.  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 maxi-
                 mum 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 maxi-
                 mum delay in which a transmit interrupt is generated.
    
         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 <freebsdnic@mailbox.intel.com>.
    
    
    

    FILES

         /dev/led/em*  identification LED device nodes
    
    
    

    EXAMPLES

         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
    
    
    

    SEE ALSO

         altq(4), arp(4), igb(4), led(4), netintro(4), ng_ether(4), polling(4),
         vlan(4), ifconfig(8)
    
    
    

    HISTORY

         The em device driver first appeared in FreeBSD 4.4.
    
    
    

    AUTHORS

         The em driver was written by Intel Corporation
         <freebsdnic@mailbox.intel.com>.
    
    
    

    BUGS

         Hardware-assisted VLAN processing is disabled by default.  You can enable
         it on an em interface using ifconfig(8).
    
    
    

    BSD May 14, 2010 BSD

    
    
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