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/*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*/
/*
* ATM Forum UNI Support
* ---------------------
*
* ITU-T Q.2110 - Subroutines
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netatm/port.h>
#include <netatm/queue.h>
#include <netatm/atm.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_cm.h>
#include <netatm/uni/sscop.h>
#include <netatm/uni/sscop_misc.h>
#include <netatm/uni/sscop_var.h>
/*
* Conditionally Clear Transmission Queues
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_clear_xmit(sop)
struct sscop *sop;
{
/*
* Only clear queues if 'Clear Buffers' == No
*/
if (sop->so_flags & SOF_NOCLRBUF)
sscop_xmit_drain(sop);
}
/*
* Initialize Data Transfer State Variables
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_init_state(sop)
struct sscop *sop;
{
/*
* Initialize for entry into Data Transfer Ready state
*/
sop->so_send = 0;
sop->so_pollsend = 0;
sop->so_ack = 0;
sop->so_pollack = 1;
sop->so_polldata = 0;
sop->so_rcvhigh = 0;
sop->so_rcvnext = 0;
}
/*
* Prepare Queues for Data Retrieval
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_prep_retrieve(sop)
struct sscop *sop;
{
/*
* If 'Clear Buffers' == No, just clear retransmit queue,
* else clear all transmission queues
*/
if (sop->so_flags & SOF_NOCLRBUF) {
sop->so_rexmit_hd = NULL;
sop->so_rexmit_tl = NULL;
} else
sscop_xmit_drain(sop);
/*
* Clear receiver queue
*/
sscop_rcvr_drain(sop);
}
/*
* Prepare Queues for Error Recovery
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_prep_recovery(sop)
struct sscop *sop;
{
/*
* If 'Clear Buffers' == No, just clear retransmit queue,
* else clear all transmission queues
*/
if (sop->so_flags & SOF_NOCLRBUF) {
sop->so_rexmit_hd = NULL;
sop->so_rexmit_tl = NULL;
} else
sscop_xmit_drain(sop);
}
/*
* Conditionally Deliver Received Data to User
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_deliver_data(sop)
struct sscop *sop;
{
/*
* If 'Clear Buffers' == No, give data to user
*/
if (sop->so_flags & SOF_NOCLRBUF) {
/*
* We don't support 'Clear Buffers' == No, so don't bother
*/
}
/*
* Clear receiver queue
*/
sscop_rcvr_drain(sop);
}
/*
* Enter Connection Recovery Mode
*
* Arguments:
* sop pointer to sscop connection block
*
* Returns:
* none
*
*/
void
q2110_error_recovery(sop)
struct sscop *sop;
{
/*
* Stop data transfer timers
*/
sop->so_timer[SSCOP_T_POLL] = 0;
sop->so_timer[SSCOP_T_NORESP] = 0;
sop->so_timer[SSCOP_T_IDLE] = 0;
sop->so_flags &= ~SOF_KEEPALIVE;
/*
* Initialize receiver window
*/
SEQ_SET(sop->so_rcvmax, sop->so_parm.sp_rcvwin);
/*
* Send first ER PDU
*/
sop->so_connctl = 1;
SEQ_INCR(sop->so_sendconn, 1);
(void) sscop_send_er(sop);
/*
* Set retransmit timer
*/
sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
/*
* Clear out appropriate queues
*/
q2110_prep_recovery(sop);
/*
* Wait for ERAK
*/
sop->so_state = SOS_OUTRECOV;
return;
}
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