sys/netproto/atm/uni/qsaal1_subr.c

   1 /*
   2  *
   3  * ===================================
   4  * HARP  |  Host ATM Research Platform
   5  * ===================================
   6  *
   7  *
   8  * This Host ATM Research Platform ("HARP") file (the "Software") is
   9  * made available by Network Computing Services, Inc. ("NetworkCS")
  10  * "AS IS".  NetworkCS does not provide maintenance, improvements or
  11  * support of any kind.
  12  *
  13  * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
  14  * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
  15  * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
  16  * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
  17  * In no event shall NetworkCS be responsible for any damages, including
  18  * but not limited to consequential damages, arising from or relating to
  19  * any use of the Software or related support.
  20  *
  21  * Copyright 1994-1998 Network Computing Services, Inc.
  22  *
  23  * Copies of this Software may be made, however, the above copyright
  24  * notice must be reproduced on all copies.
  25  *
  26  *      @(#) $FreeBSD: src/sys/netatm/uni/qsaal1_subr.c,v 1.4 2000/01/17 20:49:50 mks Exp $
  27  *      @(#) $DragonFly: src/sys/netproto/atm/uni/qsaal1_subr.c,v 1.5 2006/01/14 13:36:39 swildner Exp $
  28  */
  29
  30 /*
  31  * ATM Forum UNI Support
  32  * ---------------------
  33  *
  34  * ITU-T Q.SAAL1 - Subroutines
  35  *
  36  */
  37
  38 #include <netproto/atm/kern_include.h>
  39
  40 #include "sscop.h"
  41 #include "sscop_misc.h"
  42 #include "sscop_var.h"
  43
  44 /*
  45  * Re-establish a new SSCOP Connection
  46  *
  47  * Arguments:
  48  *      sop     pointer to sscop connection block
  49  *
  50  * Returns:
  51  *      none
  52  *
  53  */
  54 void
  55 qsaal1_reestablish(struct sscop *sop)
  56 {
  57
  58         /*
  59          * Stop polling timers
  60          */
  61         sop->so_timer[SSCOP_T_POLL] = 0;
  62         sop->so_timer[SSCOP_T_NORESP] = 0;
  63         sop->so_flags &= ~SOF_KEEPALIVE;
  64
  65         /*
  66          * Note that we're reestablishing a connection
  67          */
  68         sop->so_flags |= SOF_REESTAB;
  69
  70         /*
  71          * Send first BGN PDU
  72          */
  73         sop->so_connctl = 1;
  74         sscop_send_bgn(sop, SSCOP_SOURCE_SSCOP);
  75
  76         /*
  77          * Reset transmit variables
  78          */
  79         qsaal1_reset_xmit(sop);
  80
  81         /*
  82          * Set retransmit timer
  83          */
  84         sop->so_timer[SSCOP_T_CC] = sop->so_parm.sp_timecc;
  85
  86         /*
  87          * Wait for BGAK
  88          */
  89         sop->so_state = SOS_OUTCONN;
  90
  91         return;
  92 }
  93
  94
  95 /*
  96  * Reset connection's transmitter state
  97  *
  98  * Arguments:
  99  *      sop     pointer to sscop connection block
 100  *
 101  * Returns:
 102  *      none
 103  *
 104  */
 105 void
 106 qsaal1_reset_xmit(struct sscop *sop)
 107 {
 108
 109         /*
 110          * Drain the transmission queues
 111          */
 112         sscop_xmit_drain(sop);
 113
 114         /*
 115          * Reset transmit variables
 116          */
 117         SEQ_SET(sop->so_send, 0);
 118         SEQ_SET(sop->so_pollsend, 0);
 119         SEQ_SET(sop->so_ack, 0);
 120         SEQ_SET(sop->so_pollack, 0);
 121         if (sop->so_state != SOS_INCONN)
 122                 SEQ_SET(sop->so_sendmax, 0);
 123         sop->so_polldata = 0;
 124
 125         return;
 126 }
 127
 128
 129 /*
 130  * Reset connection's receiver state
 131  *
 132  * Arguments:
 133  *      sop     pointer to sscop connection block
 134  *
 135  * Returns:
 136  *      none
 137  *
 138  */
 139 void
 140 qsaal1_reset_rcvr(struct sscop *sop)
 141 {
 142
 143         /*
 144          * Drain the receiver queues
 145          */
 146         sscop_rcvr_drain(sop);
 147
 148         /*
 149          * Reset transmit variables
 150          */
 151         SEQ_SET(sop->so_rcvnext, 0);
 152         SEQ_SET(sop->so_rcvhigh, 0);
 153         SEQ_SET(sop->so_rcvmax, sop->so_parm.sp_rcvwin);
 154
 155         return;
 156 }
 157
 158
 159 /*
 160  * Clear connection's connection data
 161  *
 162  * Arguments:
 163  *      sop     pointer to sscop connection block
 164  *
 165  * Returns:
 166  *      none
 167  *
 168  */
 169 void
 170 qsaal1_clear_connection(struct sscop *sop)
 171 {
 172
 173         /*
 174          * Can we clear transmit buffers ??
 175          */
 176         if ((sop->so_flags & SOF_NOCLRBUF) == 0) {
 177                 /*
 178                  * Yes, drain the transmission queues
 179                  */
 180                 sscop_xmit_drain(sop);
 181         }
 182
 183         /*
 184          * Clear service required flag
 185          */
 186         sop->so_flags &= ~SOF_XMITSRVC;
 187
 188         /*
 189          * Drain receive queue buffers
 190          */
 191         sscop_rcvr_drain(sop);
 192
 193         return;
 194 }
 195