PCN(4D) Devices PCN(4D)

NAME

pcn - PCnet Ethernet device driver

SYNOPSIS

/dev/pcn

DESCRIPTION

The pcn driver is a multi-threaded, loadable, clonable GLDv3-based
STREAMS driver supporting the Data Link Provider Interface dlpi(4P)
for the AMD PCnet family of Ethernet controllers.

APPLICATION PROGRAMMING INTERFACE

The pcn driver can be used as either a "style 1" or a "style 2" Data
Link Service Provider. Physical points of attachment (PPAs) are
interpreted as the instance number of the pcn controller as assigned
by the operating environment.


The values returned by the driver in the DL_INFO_ACK response are:

o Maximum SDU is 1500.

o Minimum SDU is 0.

o The dlsap address length is 8.

o MAC type is DL_ETHER.

o SAP length is -2. The 6-byte physical address is
immediately followed by a 2-byte SAP.

o Service mode is DL_CLDLS.

o The broadcast address is the 6-byte Ethernet broadcast
address (ff:ff:ff:ff:ff:ff).

CONFIGURATION

The pcn driver performs auto-negotiation to select the link speed and
mode. Link speed may be 100Mbps full-duplex, 100Mbps half-duplex,
10Mbps full-duplex, or 10Mbps half-duplex, depending on the hardware
adapter type. See the IEEE802.3 standard for more information.


The capabilities advertised by the pcn device can be set using
dladm(8). The driver supports a number of parameters whose names
begin with en_ (see below). Each of these parameters contains a
boolean value that determines if the device advertises that mode of
operations. The adv_autoneg_cap parameter controls whether auto-
negotiation is performed. If adv_autoneg_cap is set to 0, the driver
forces the mode of operation selected by the first non-zero parameter
in priority order as shown below:

(highest priority/greatest throughput)
en_100fdx_cap 100Mbps full duplex
en_10fdx_cap 10Mbps full duplex
(lowest priority/least throughput)


All capabilities default to enabled. Note that changing any
capability parameter causes the link to go down while the link
partners renegotiate the link speed/duplex using the newly changed
capabilities.

ATTRIBUTES

See attributes(7) for a description of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Architecture | x86 |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+

FILES

/dev/pcn

Special character device.


/kernel/drv/amd64/pcn

Device driver (x86)

SEE ALSO

streamio(4I), dlpi(4P), attributes(7)


IEEE 802.3 -- Institute of Electrical and Electronics Engineers, 2002

January 10, 2020 PCN(4D)