Adaptec AHA-1520A Manual de Serviço descarregar pdf (Página 275)

SunOS 5.5 Devices qe(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 qe 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.

If the user selects a sap with a value of 0, the receiver will be in 802.3 mode. All frames

received from the media having a “type” ﬁeld in the range [0-1500] are assumed to be

802.3 frames and are routed up all open Streams which are bound to sap value 0. If more

than one Stream is in “802.3 mode” then the frame will be duplicated and routed up mul-

tiple Streams as DL_UNITDATA_IND messages.

In transmission, the driver checks the sap ﬁeld of the DL_BIND_REQ if the sap value is 0,

and if the destination type ﬁeld is in the range [0-1500]. If either is true, the driver com-

putes the lengthof the message, not includinginitialM_PROTO mblk (message block), of

all subsequentDL_UNITDATA_REQ messages and transmits 802.3 frames that have this

value in the MAC frame header length ﬁeld.

The driver also supports raw M_DATA mode. When the user sends a DLIOCRAW ioctl,

the particular Stream is put in raw mode. A complete frame along with a proper ether

header is expected as part of the data.

The qe 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 the DL_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 qe driver. The qe driver will route received Ether-

net 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.

qe 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 followingDL_ATTACHED.

modiﬁed 3 Mar 1994 7D-271

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Adaptec AHA-1520A Manual de Serviço Página 275