Adaptec AHA-1520A Wartungshandbuch PDF herunterladen (Seite 135)

SunOS 5.5 Devices ie(7D)

Once in theDL_ATTACHED state, the user must send a DL_BIND_REQ to associate a par-

ticular SAP (Service Access Pointer) with the stream. The ie driver interprets the sap ﬁeld

within theDL_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 provided by the driver and works

as follows. sap values in the range [0-1500] are treated as equivalentand represent a

desire by the user for “802.3 mode”. If the value of the sap ﬁeld of the DL_BIND_REQ is

within this range, then the driver computes the length of the message, not includingthe

initialM_PROTO message block, of all subsequent DL_UNITDATA_REQ messages and

transmits 802.3 frames having this value in theMAC frame header lengthﬁeld. All

frames received from the media having a “type” ﬁeld in this range are assumed to be

802.3 frames and 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 asDL_UNITDATA_IND messages.

The ie 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 use information returned in the

DL_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 phy-

sical 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 ie driver. The ie driver will route received Ethernet

frames up all those open and bound streams having 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.

ie Primitives In addition to the mandatory connectionlessDLPI message set the driver additionally

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 following DL_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

(“promiscuous mode”) frames on the media including frames generated by the local host.

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

(Ethernet type) values. When used with the DL_PROMISC_MULTI ﬂag set this

enables/disables reception of all multicast group addresses. The effect of each is always

modiﬁed 1 Feb 1993 7D-131

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