Technical data

SunOS 5.5 Devices smce(7D)
QOS fields are 0.
The provider style isDL_STYLE2.
The version isDL_VERSION_2.
The broadcast address value is Ethernet/IEEE broadcast address
(FF:FF:FF:FF:FF:FF).
Once in theDL_ATTACHED state, the user must send a DL_BIND_REQ to associate a par-
ticular Service Access Pointer (SAP) with the stream. The smce driver interprets the sap
field within the DL_BIND_REQ as an Ethernet “type;” therefore valid values for the sap
field are in the [0-0xFFFF] range. Only one Ethernet type can be bound to the stream at
any time.
In addition to Ethernet V2 service, an “802.3 mode” is also provided by the driver. In this
mode, sap values in the range [0-1500] are treated as equivalent and represent a desire by
the user for “802.3” mode. If the value of the sap field of theDL_BIND_REQ message is
within this range, then the driver expects that the destinationDLSAP in a
DL_UNITDATA_REQ will contain the length of the data rather than a sap value. All
frames received from the media that have a “type” field in this range are assumed to be
802.3 frames, and they are routed up all open streams which are bound to any sap value
within this range. If more than one stream is in “802.3 mode,” then the frame will be
duplicated and routed up multiple streams as DL_UNITDATA_IND messages.
The smce driver DLSAP address format consists of the 6-byte physical (Ethernet) address
component followed immediately by the 2-byte sap (type) component, producing an 8-
byteDLSAP address. Applications should not hardcode to this particular
implementation-specificDLSAP address format, but should instead use information
returned in theDL_INFO_ACK primitive to compose and decompose DLSAP addresses.
The sap length, full DLSAP length, and sap/physical ordering are included within the
DL_INFO_ACK. The physical address lengthcan be computed by subtracting the sap
length from the full DLSAP address length or by issuing theDL_PHYS_ADDR_REQ to
obtain the current physical address associated with the stream.
Once in theDL_BOUND state, the user may transmit frames on the Ethernet by sending
DL_UNITDATA_REQ messages to the smce driver. The smce driver will route received
Ethernet frames up all open and bound streams that have a sap which matches the Ether-
net type asDL_UNITDATA_IND messages. Received Ethernet frames are duplicated and
routed up multiple open streams if necessary. The DLSAP address contained within the
DL_UNITDATA_REQ and DL_UNITDATA_IND messages consists of both the sap (type)
and physical (Ethernet) components.
smce Primitives In addition to the mandatory connectionlessDLPI message set, the driver also supports
the following primitives:
The DL_ENABMULTI_REQ andDL_DISABMULTI_REQ primitives enable/disable recep-
tion of individual multicast group addresses. A set of multicast addresses may be itera-
tively created and modified on a per-stream basis using these primitives. These primi-
tives are accepted by the driver in any state followingDL_ATTACHED.
modified 2 May 1995 7D-293