The Standard Ethernet data link control (DLCETHER) conforms to the generic data link control (GDLC) guidelines except as follows:
Note: The dlc prefix is replaced with the edl prefix for the DLCETHER device manager.
|edlclose||DLCETHER is fully compatible with the dlcclose GDLC interface.|
|edlconfig||DLCETHER is fully compatible with the dlcconfig GDLC interface. No initialization parameters are required.|
|edlmpx||DLCETHER is fully compatible with the dlcmpx GDLC interface.|
|edlopen||DLCETHER is fully compatible with the dlcopen GDLC interface.|
|edlread||DLCETHER is compatible with the dlcread
GDLC interface with the following conditions:
The following kernel receive
packet subroutines always have the DLCETHER data link header information
within the communications memory buffer (mbuf) and can locate it by
subtracting the length passed (in the gdl_io_ext structure) from
the data offset field of the mbuf structure.
|edlselect||DLCETHER is fully compatible with the dlcselect GDLC interface.|
|edlwrite||DLCETHER is compatible with the dlcwrite GDLC interface with the exception that network data can only be written as an unnumbered information (UI) packet and must have the complete data link header prefixed to the data. DLCETHER verifies that the local (source) service access point (SAP) is enabled and that the control byte is UI (0x03). See the DLCETHER Frame Encapsulation figure|
|edlioctl||DLCETHER is compatible with the dlcioctl GDLC interface with conditions on these operations (described in the following sections):|
The ioctl subroutine argument structure for enabling a SAP (dlc_esap_arg) has the following specifics:
Note: No checks are made by the DLCETHER device manager as to whether a received packet was accepted by the adapter due to a preset network address or group address.
|ENCD||Indicates a synchronous data link control (SDLC) serial encoding.|
|NTWK||Indicates a teleprocessing network type.|
|LINK||Indicates a teleprocessing link type.|
|PHYC||Indicates a physical network call (teleprocessing).|
|ANSW||Indicates a teleprocessing autocall and autoanswer.|
The ioctl subroutine argument structure for starting a link station (dlc_sls_arg) has the following specifics:
|STAT||Indicates a station type for SDLC.|
|NEGO||Indicates a negotiable station type for SDLC.|
The ioctl subroutine argument structure for altering a link station (dlc_alter_arg) has the following specifics:
|SM1, SM2||Sets synchronous data link control (SDLC) control mode.|
The device driver-dependent data returned from DLCETHER for this ioctl operation is the ent_ndd_stats_t structure defined in the /usr/include/sys/cdli_entuser.h file.
No protocol-specific data area is supported by DLCETHER for this ioctl operation.
The enter_short_hold option is not supported by the DLCETHER device manager.
The exit_short_hold option is not supported by the DLCETHER device manager.
The add_group or multicast address option is supported by the DLCETHER device manager as a six-byte value as described above in DLC_ENABLE_SAP (group address) ioctl operation.
The add_functional_address option is not supported by DLCETHER.
The delete_functional_address option is not supported by DLCETHER.
The delete group or multicast option is supported by the DLCETHER device manager. The address being removed must match an address that was added with a DLC_ENABLE_SAP or DLC_ADD_GRP ioctl operation.
The ioctype variable returned is defined as DD_DLC definition and the subtype returned is DS_DLCETHER.