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JME(4)			     Kernel Interfaces Manual			  JME(4)

NAME
     jme -- JMicron Gigabit/Fast Ethernet driver

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device jme

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

	   if_jme_load="YES"

DESCRIPTION
     The jme device driver provides support for JMicron JMC250 PCI Express Giga-
     bit  Ethernet controllers and JMicron JMC260 PCI Express Fast Ethernet con-
     trollers.

     All LOMs supported by the jme driver have TCP/UDP/IP checksum  offload  for
     both  transmit  and  receive, TCP segmentation offload (TSO), hardware VLAN
     tag stripping/insertion features, Wake On Lan (WOL) and an  interrupt  coa-
     lescing/moderation mechanism as well as a 64-bit multicast hash filter.

     The JMC250 also supports Jumbo Frames (up to 9216 bytes), which can be con-
     figured  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 jme driver supports the following media types:

     autoselect   Enable  autoselection of the media type and options.	The user
		  can manually override the autoselected mode  by  adding  media
		  options to rc.conf(5).

     10baseT/UTP  Set 10Mbps operation.

     100baseTX	  Set 100Mbps (Fast Ethernet) operation.

     1000baseTX   Set 1000baseTX operation over twisted pair.

     The jme driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

     For more information on configuring this device, see ifconfig(8).

LOADER TUNABLES
     Tunables  can  be	set at the loader(8) prompt before booting the kernel or
     stored in loader.conf(5).

     hw.jme.msi_disable
	     This tunable disables MSI support on the  Ethernet  hardware.   The
	     default value is 0.

     hw.jme.msix_disable
	     This  tunable disables MSI-X support on the Ethernet hardware.  The
	     default value is 0.

SYSCTL VARIABLES
     The following variables are  available  as  both  sysctl(8)  variables  and
     loader(8) tunables:

     dev.jme.%d.tx_coal_to
	     Maximum  amount  of  time	to  delay for Tx completion interrupt in
	     units of 1us.  The accepted range is 1 to 65535, the default is 100
	     (100us).

     dev.jme.%d.tx_coal_pkt
	     Maximum number of packets to fire Tx completion interrupt.  The ac-
	     cepted range is 1 to 255, the default is 8.

     dev.jme.%d.rx_coal_to
	     Maximum amount of time to delay  for  Rx  completion  interrupt  in
	     units of 1us.  The accepted range is 1 to 65535, the default is 100
	     (100us).

     dev.jme.%d.rx_coal_pkt
	     Maximum number of packets to fire Rx completion interrupt.  The ac-
	     cepted range is 1 to 255, the default is 2.

     dev.jme.%d.process_limit
	     Maximum  amount  of Rx events to be processed in the event loop be-
	     fore rescheduling a taskqueue.  The accepted range is  10	to  255,
	     the default value is 128 events.  The interface does not need to be
	     brought down and up again before a change takes effect.

SEE ALSO
     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)

HISTORY
     The  jme  driver  was  written by Pyun YongHyeon <yongari@FreeBSD.org>.  It
     first appeared in FreeBSD 7.1.

FreeBSD 7.1			  May 27, 2008				  JME(4)
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