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