DragonFly On-Line Manual Pages

JME(4)		      DragonFly 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
     Gigabit Ethernet controllers and JMicron JMC260 PCI Express Fast Ethernet
     controllers.

     All LOMs supported by the jme driver have TCP/UDP/IP checksum offload for
     both transmit and receive, hardware VLAN tag stripping/insertion fea-
     tures, an interrupt coalescing/moderation mechanism as well as a 64-bit
     multicast hash filter.

     The JMC250 also supports Jumbo Frames (up to 9216 bytes), which can be
     configured 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.

     1000baseT	  Set 1000baseT 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).	The
     jme driver supports polling(4).

   Loader Tunables
     By default, the driver will use MSI if it is supported.  This behavior
     can be turned off by setting the following tunable:

	   hw.jme.msi.enable=0

   MIB Variables
     A number of per-interface variables are implemented in the hw.jmeX branch
     of the sysctl(3) MIB.

     tx_coal_to     Maximum amount of time to delay for TX completion inter-
		    rupt in units of 1us.  The accepted range is 1 to 65535,
		    the default is 65535 (65535us).

     tx_coal_pkt    Maximum number of packets to fire TX completion interrupt.
		    The accepted range is 0 to 255, the default is 64.	Packet
		    count based TX interrupt coalescing could be disabled by
		    setting this variable to 0.

     rx_coal_to     Maximum amount of time to delay for RX completion inter-
		    rupt in units of 1us.  The accepted range is 1 to 65535,
		    the default is 100 (100us).

     rx_coal_pkt    Maximum number of packets to fire RX completion interrupt.
		    The accepted range is 0 to 255, the default is 64.	Packet
		    count based RX interrupt coalescing could be disabled by
		    setting this variable to 0.

     rx_desc_count  Number of RX descriptors per-ring (read-only).  Use the
		    tunable hw.jme.rx_desc_count to configure it.

     tx_desc_count  Number of TX descriptors (read-only).  Use the tunable
		    hw.jme.tx_desc_count to configure it.

     rx_ring_count  Number of RX rings (read-only).  Use the tunable
		    hw.jme.rx_ring_count to configure it.

     rx_ring_inuse  Number of RX rings being used (read-only).

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

HISTORY
     The jme driver was written by Pyun YongHyeon <yongari@FreeBSD.org>.  It
     first appeared in FreeBSD 7.1 and was imported into DragonFly 2.1.

DragonFly 3.5			 April 7, 2012			 DragonFly 3.5