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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, TCP segmentation offload (TSO), hardware VLAN
     tag stripping/insertion features, Wake On Lan (WOL) and 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.

     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
             accepted 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
             accepted 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
             before 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.