* @(#)60 1.1 src/bos/kernext/dlpi/README.dlpi, sysxdlpi, bos41J, 9514A_all 4/4/95 13:43:05
*
* COMPONENT_NAME: SYSXDLPI
*
* FUNCTIONS:
*
* ORIGINS: 27
*
*
* (C) COPYRIGHT International Business Machines Corp. 1994, 1995
* All Rights Reserved
* Licensed Materials - Property of IBM
* US Government Users Restricted Rights - Use, duplication or
* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
*
README file for the STREAMS DLPI Driver
The DLPI driver now supports both the connectionless and connection-oriented
modes of communication. See the infoExplorer article, "Data Link Provider
Interface Information", for specific information on the implementation of this
version of the AIX DLPI driver.
For binary compatibility purposes, you should be aware of the following
temporary features in the connectionless/connection-oriented AIX dlpi driver:
(1) For binary compatibility purposes, there are no new statistics added for
the connection-oriented functions. Statistics for the connection-oriented
statistics will be provided in a future full release of AIX.
(2) For binary compatibility purposes, a DL_UNITDATA_IND header is provided in
the messages for promiscuous mode and raw mode. Be aware that this header
will be removed in a future full release of AIX.
The following sample code fragment will work with the 4.1 version of dlpi
and future releases of dlpi:
if (raw_mode) {
if (mp->b_datap->db_type == M_PROTO) {
union DL_primitives *p;
p = (union DL_primitives *)mp->b_rptr;
if (p->dl_primitive == DL_UNITDATA_IND) {
mblk_t *mp1 = mp->b_cont;
freeb(mp);
mp = mp1;
}
}
}
The above code fragment simply discards the DL_UNITDATA_IND header.
For compatibility with future releases, it is recommended that you parse
the frame yourself. The MAC and LLC headers are presented in the M_DATA
message for both promiscuous mode and raw mode.
Raw mode currently accepts, but does not require, a DL_UNITDATA_REQ. In a
future release of AIX, raw mode will not accept a DL_UNITDATA_REQ; only
M_DATA will be accepted.
