jme(4) [netbsd man page]

JME(4)							   BSD Kernel Interfaces Manual 						    JME(4)

NAME

     jme -- JMicron Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet controller driver

SYNOPSIS

     jme* at pci? dev ? function ?

     Configuration of PHYs is necessary.  See mii(4).

DESCRIPTION

     The jme device driver supports network adapters based on the JMicron Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet chips.
     The following features are supported:

	   IPv4 transmit/receive IP/TCP/UDP checksum offload
	   IPv6 transmit TCP/UDP checksum offload
	   IPv4 and IPv6 TCP segmentation offload
	   VLAN tag insertion/removal
	   Interrupt coalescing
	   10/100/1000Mbps operation in full-duplex mode
	   10/100Mbps operation in half-duplex mode
	   Jumbo frames (up to 9022 bytes)

     Due to hardware limitation checksums and TCP segmentation offload can't be enabled if the configured MTU is larger than 4000 bytes.

     Interrupt coalescing can be controlled on a per-adapter basis through the following sysctls:

     hw.jme.jme<x>.int_rxtos  jme receive interrupt moderation timer, in microseconds (defaults to 100)

     hw.jme.jme<x>.int_rxct   jme receive interrupt moderation packet counter (defaults to 128)

     hw.jme.jme<x>.int_txto   jme transmit interrupt moderation timer, in microseconds (defaults to 100)

     hw.jme.jme<x>.int_txct   jme transmit interrupt moderation packet counter (defaults to 128)

SEE ALSO

     ifmedia(4), mii(4), netintro(4), pci(4), ifconfig(8)

HISTORY

     The jme device driver first appeared in NetBSD 5.0.

BUGS

     Hardware bugs prevent support of IPv6 receive TCP/UDP checksum offload in the JMC250 rev A2, and is disabled in the driver.  This should be
     revisited when a newer hardware revision is available.

BSD
								 October 17, 2008							       BSD

JME(4)							   BSD 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 Ether-
     net 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:

     o	 JMicron JMC250 PCI Express Gigabit Ethernet controller
     o	 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.

BSD
								  October 6, 2008							       BSD