JME(4) | Device Drivers Manual | JME(4) |
jme
— JMicron
Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet controller
driver
jme* at pci? dev ? function ?
Configuration of PHYs is necessary. See mii(4).
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
hw.jme.jme<x>.int_rxct
hw.jme.jme<x>.int_txto
hw.jme.jme<x>.int_txct
ifmedia(4), jmphy(4), mii(4), netintro(4), pci(4), ifconfig(8)
The jme
device driver first appeared in
NetBSD 5.0.
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.
October 30, 2019 | NetBSD 10.99 |