Adaptec AHA-1520A Manual de Serviço descarregar pdf (Página 102)

elink(7D) Devices SunOS 5.5

(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 elink 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 is within this

range, then the driver expects that the destinationDLSAP in aDL_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 elink 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-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 elink driver. The elink 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.

elink 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.

7D-98 modiﬁed 2 May 1995

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Adaptec AHA-1520A Manual de Serviço Página 102