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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).

HARDWARE

     The jme device driver provides support for the following Ethernet controllers:

     ·   JMicron JMC250 PCI Express Gigabit Ethernet controller
     ·   JMicron JMC260 PCI Express Fast Ethernet controller

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.