sppp_mod.c revision 193974072f41a843678abf5f61979c748687e66b
/*
* sppp_mod.c - modload support for PPP pseudo-device driver.
*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, provided that the above copyright
* notice appears in all copies.
*
* SUN MAKES NO REPRESENTATION OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES
*
* Copyright (c) 1994 The Australian National University.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, provided that the above copyright
* notice appears in all copies. This software is provided without any
* warranty, express or implied. The Australian National University
* makes no representations about the suitability of this software for
* any purpose.
*
* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
*
* This driver is derived from the original SVR4 STREAMS PPP driver
* originally written by Paul Mackerras <paul.mackerras@cs.anu.edu.au>.
*
* Adi Masputra <adi.masputra@sun.com> rewrote and restructured the code
* for improved performance and scalability.
*/
#define RCSID " $Id: sppp_mod.c,v 1.0 2000/05/08 10:53:28 masputra Exp $"
#include "s_common.h"
#include "sppp.h"
/*
* Globals for PPP multiplexer module wrapper
*/
extern const char sppp_module_description[];
static dev_info_t *_mi_dip;
static struct module_info sppp_modinfo = {
PPP_MOD_ID, /* mi_idnum */
PPP_DRV_NAME, /* mi_idname */
0, /* mi_minpsz */
PPP_MAXMTU, /* mi_maxpsz */
PPP_MI_HIWAT, /* mi_hiwat */
PPP_MI_LOWAT /* mi_lowat */
};
static struct qinit sppp_urinit = {
NULL, /* qi_putp */
NULL, /* qi_srvp */
sppp_open, /* qi_qopen */
sppp_close, /* qi_qclose */
NULL, /* qi_qadmin */
&sppp_modinfo, /* qi_minfo */
NULL /* qi_mstat */
};
static struct qinit sppp_uwinit = {
(int (*)())sppp_uwput, /* qi_putp */
(int (*)())sppp_uwsrv, /* qi_srvp */
NULL, /* qi_qopen */
NULL, /* qi_qclose */
NULL, /* qi_qadmin */
&sppp_modinfo, /* qi_minfo */
NULL /* qi_mstat */
};
static struct qinit sppp_lrinit = {
(int (*)())sppp_lrput, /* qi_putp */
NULL, /* qi_srvp */
NULL, /* qi_qopen */
NULL, /* qi_qclose */
NULL, /* qi_qadmin */
&sppp_modinfo, /* qi_minfo */
NULL /* qi_mstat */
};
static struct qinit sppp_lwinit = {
NULL, /* qi_putp */
(int (*)())sppp_lwsrv, /* qi_srvp */
NULL, /* qi_qopen */
NULL, /* qi_qclose */
NULL, /* qi_qadmin */
&sppp_modinfo, /* qi_minfo */
NULL /* qi_mstat */
};
&sppp_urinit, /* st_rdinit */
&sppp_uwinit, /* st_wrinit */
&sppp_lrinit, /* st_muxrinit */
&sppp_lwinit /* st_muxwrinit */
};
/*
* Descriptions for flags values in cb_flags field:
*
* D_MTQPAIR:
* An inner perimeter that spans the queue pair.
* D_MTOUTPERIM:
* An outer perimeter that spans over all queues in the module.
* D_MTOCEXCL:
* Open & close procedures are entered exclusively at outer perimeter.
* D_MTPUTSHARED:
* Entry to put procedures are done with SHARED (reader) acess
* and not EXCLUSIVE (writer) access.
*
* Therefore:
*
* 1. Open and close procedures are entered with EXCLUSIVE (writer)
* access at the inner perimeter, and with EXCLUSIVE (writer) access at
* the outer perimeter.
*
* 2. Put procedures are entered with SHARED (reader) access at the inner
* perimeter, and with SHARED (reader) access at the outer perimeter.
*
* 3. Service procedures are entered with EXCLUSIVE (writer) access at
* the inner perimeter, and with SHARED (reader) access at the
* outer perimeter.
*
* Do not attempt to modify these flags unless the entire corresponding
* driver code is changed to accomodate the newly represented MT-STREAMS
* flags. Doing so without making proper modifications to the driver code
* will severely impact the intended driver behavior, and thus may affect
* the system's stability and performance.
*/
&mod_driverops, /* drv_modops */
(char *)sppp_module_description, /* drv_linkinfo */
&sppp_ops /* drv_dev_ops */
};
static struct modlinkage modlinkage = {
MODREV_1, /* ml_rev, has to be MODREV_1 */
&modldrv, /* ml_linkage, NULL-terminated list */
NULL /* of linkage structures */
};
int
_init(void)
{
return (mod_install(&modlinkage));
}
int
_fini(void)
{
return (mod_remove(&modlinkage));
}
int
{
}
/*
* _mi_driver_attach()
*
* Description:
* Attach a point-to-point interface to the system.
*/
static int
{
if (cmd != DDI_ATTACH) {
return (DDI_FAILURE);
}
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}
/*
* _mi_driver_detach()
*
* Description:
* Detach an interface to the system.
*/
static int
{
if (cmd != DDI_DETACH) {
return (DDI_FAILURE);
}
return (DDI_SUCCESS);
}
/*
* _mi_driver_info()
*
* Description:
* Translate "dev_t" to a pointer to the associated "dev_info_t".
*/
/* ARGSUSED */
static int
void **result)
{
int rc;
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
rc = DDI_FAILURE;
} else {
rc = DDI_SUCCESS;
}
break;
case DDI_INFO_DEVT2INSTANCE:
rc = DDI_SUCCESS;
break;
default:
rc = DDI_FAILURE;
break;
}
return (rc);
}