PCN(4D) 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)