LLA to DLPI Migration
Transmitting Data
Transmitting Data
LLA requires the user to log a destination address (LOG_DEST_ADDR) and a destination service access point (LOG_DSAP) prior to sending any data.
DLPI requires the user to specify the destination address and destination service access point (dsap) as part of the data transfer request. The combination of destination MAC address and dsap is referred to as the DLSAP address.
The DLSAP address format is basically the destination MAC address followed by the LLC protocol value. A complete description of the DLSAP address format is described in the DLPI Programmer's Guide.
LLA supports the write system call for sending data requests.
DLPI only supports the putmsg system call for sending data over RAW (see the DLPI Programmer's Guide) and connectionless mode streams. The write system call is only supported over connection oriented streams in the DATA_XFER state (i.e. a connection must be established).
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