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SunOS 5.5 Devices elx(7D)

(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 elx driver interprets the sap

ﬁeld within the DL_BIND_RE 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 provided by the driver and works

as follows. 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 is

within this range, then the driver computs the lengthof the message, not includingthe

initialM_PROTO mblk (message block), of all subsequent DL_UNITDATA_REQ messages

and transmit 802.3 frames that have this value in the MAC frame header length ﬁeld. 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 elx 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-

byte DLSAP address. Applications should not hardcode to this particular

implementation-speciﬁc DLSAP 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 length can 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 elx driver. The elx driver will route received Ether-

net frames up all open and bound streams that have a sap which matches the Ethernet

type as DL_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.

elx 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.

The DL_PROMISCON_REQ andDL_PROMISCOFF_REQ primitives with the

DL_PROMISC_PHYS ﬂag set in the dl_level ﬁeld enables/disablesreception of all “prom-

iscuous mode” frames on the media including frames generated by the local host.

modiﬁed 15 Feb 1994 7D-101

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