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.