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tr(7D) Devices SunOS 5.5

The token ring broadcast address (C0:00:FF:FF:FF:FF) is also supported.

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 tr driver interprets the sap ﬁeld

within theDL_BIND_REQ as an IEEE 802.2 sap; therefore valid values for the sap ﬁeld are

in the [0-0xFF] range, of which only even values are legal.

In addition to 802.2 service, a “SNAP mode” is also provided by the driver. In this mode,

sap values in the range [0x5de-0xffff] are used to indicate a request to use “SNAP” mode.

The tr driver DLSAP address format consists of the 6-byte physical token ring address

component followed immediately by the 1 or 2-byte sap component, producing a 7 or 8-

byteDLSAP address. Applications should not hardcode to this particular

implementation-speciﬁcDLSAP address format, but should instead use information

returned by 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 token ring by sending

DL_UNITDATA_REQ messages to the tr driver. The tr driver will route received token

ring frames up all open and bound streams that have a sap which matches the sap in the

DL_UNITDATA_IND messages. Received token ring 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 and

physical (token ring) components.

tr 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 is currently unsupported for this driver.

When used with the DL_PROMISC_SAP ﬂag set, this enables/disablesreception of all sap

values. When used with theDL_PROMISC_MULTI ﬂag set, this enables/disables recep-

tion of all functional addresses. The effect of each is always on a per-stream basis and

independent of the other sap and physical level conﬁgurations on this stream or other

streams.

The DL_PHYS_ADDR_REQ primitive returns the 6-octet token ring address currently

associated (attached) to the stream in theDL_PHYS_ADDR_ACK primitive. This primitive

is valid only in states following a successful DL_ATTACH_REQ.

7D-380 modiﬁed 15 Oct 1993

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Adaptec AHA-1520A Manual de Serviço Página 384