|Main index||Section 4||Options|
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
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).|
|Set 10Mbps operation.|
|100baseTX||Set 100Mbps (Fast Ethernet) operation.|
|1000baseTX||Set 1000baseTX operation over twisted pair.|
The jme driver supports the following media options:
|Force full duplex operation.|
|Force half duplex operation.|
For more information on configuring this device, see ifconfig(8).
|This tunable disables MSI support on the Ethernet hardware. The default value is 0.|
|This tunable disables MSI-X support on the Ethernet hardware. The default value is 0.|
|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).|
|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.|
|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).|
|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.|
|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.|
There are two known 1000baseT link establishment issues with JMC25x. If the full mask revision number of JMC25x controller is less than or equal to 4 and the link partner enabled the IEEE 802.3az Energy Efficient Ethernet feature, the controller will not be able to establish a 1000baseT link. Also, if the length of the cable is longer than 120 meters, the controller can not establish a 1000baseT link. The known workaround for these issues is to force manual link configuration with 100baseTX instead of relying on auto-negotiation. The full mask revision number of controller can be checked with the verbose kernel boot option. Use the lower nibble of the chip revision number to get the full mask revision of the controller.
|JME (4)||March 4, 2012|
|Main index||Section 4||Options|
|“||Ken Thompson has an automobile which he helped design. Unlike most automobiles, it has neither speedometer, nor gas gauge, nor any of the other numerous idiot lights which plague the modern driver. Rather, if the driver makes a mistake, a giant “?” lights up in the center of the dashboard. “The experienced driver,” says Thompson, “will usually know what's wrong.”||”|