VV(4)

NAME
vv - Proteon proNET 10 Megabit ring

SYNOPSIS
/sys/conf/SYSTEM:
	NVV	vv_controllers	# V2LNI (Pronet)

DESCRIPTION
The vv interface provides access to a 10 Mb/s Proteon proNET ring network.

The network address of the interface must be specified with an an SIOCSIFADDR ioctl before data can be transmitted or received. It is only permissible to change the network address while the interface is marked "down".

The host's hardware address is discovered by putting the interface in digital loopback mode (not joining the ring) and sending a broadcast packet from which the hardware address is extracted.

Transmit timeouts are detected through use of a watchdog routine. Lost input interrupts are checked for when packets are sent out.

If the installation is running CTL boards which use the old broadcast address of 0 instead of the new address of 0xff, the define OLD_BROADCAST should be specified in the driver.

The driver can use ``trailer'' encapsulation to minimize copying data on input and output. This may be disabled, on a per-interface basis, by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl.

DIAGNOSTICS

vv%d: host %d. The software announces the host address discovered during autoconfiguration.

vv%d: can't initialize. The software was unable to discover the address of this interface, so it deemed "dead" will not be enabled.

vv%d: error vvocsr=%b. The hardware indicated an error on the previous transmission.

vv%d: output timeout. The token timer has fired and the token will be recreated.

vv%d: error vvicsr=%b. The hardware indicated an error in reading a packet off the ring.

en%d: can't handle af%d. The interface was handed a message with addresses formatted in an unsuitable address family; the packet was dropped.

vv%d: vs_olen=%d. The ring output routine has been handed a message with a preposterous length. This results in an immediate panic: vs_olen.

SEE ALSO
intro(4N), inet(4F)

BUGS
The encapsulation of trailer packets in the 4.2BSD version of this driver was incorrect (the packet type was in VAX byte order). As a result, the trailer encapsulation in this version is not compatible with the 4.2BSD VAX version.