jme(4) manual page

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"

The jme device driver provides support for JMicron JMC25x PCI Express Gigabit Ethernet controllers and JMicron JMC26x 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 JMC25x 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).

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.

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

dev.jme.%d.tx_coal_to
	This variable sets the maximum amount of time to delay before sending a Tx completion interrupt, in microseconds. The accepted range is 1 to 65535; the default is 100 (100us).
dev.jme.%d.tx_coal_pkt
	This variable sets the maximum number of outgoing packets which may be coalesced together into a single Tx completion interrupt. The accepted range is 1 to 255; the default is 8.
dev.jme.%d.rx_coal_to
	This variable sets the maximum amount of time to wait for additional packets to arrive (for possible packet coalescing) before firing an Rx completion interrupt, in microseconds. The accepted range is 1 to 65535; the default is 100 (100us).
dev.jme.%d.rx_coal_pkt
	This variable sets the maximum number of incoming packets which may be coalesced into a single Rx completion interrupt. The accepted range is 1 to 255; the default is 2.
dev.jme.%d.process_limit
	This variable sets the maximum number of events that will be processed in a single batch before the handler is requeued into 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.

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

“	The “N” in NFS stands for Not, or Need, or perhaps Nightmare	”
— Harry Spencer

Manual Pages — JME

NAME

CONTENTS

SYNOPSIS

DESCRIPTION

HARDWARE

LOADER TUNABLES

SYSCTL VARIABLES

SEE ALSO

HISTORY

CAVEATS

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.

full-duplex
	Force full duplex operation.
half-duplex
	Force half duplex operation.