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Annotation of Net2/netccitt/hd_timer.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) University of British Columbia, 1984
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Laboratory for Computation Vision and the Computer Science Department
        !             8:  * of the University of British Columbia.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)hd_timer.c  7.4 (Berkeley) 5/29/91
        !            39:  */
        !            40: 
        !            41: #include "param.h"
        !            42: #include "systm.h"
        !            43: #include "mbuf.h"
        !            44: #include "domain.h"
        !            45: #include "socket.h"
        !            46: #include "protosw.h"
        !            47: #include "errno.h"
        !            48: #include "time.h"
        !            49: #include "kernel.h"
        !            50: 
        !            51: #include "../net/if.h"
        !            52: 
        !            53: #include "hdlc.h"
        !            54: #include "hd_var.h"
        !            55: #include "x25.h"
        !            56: 
        !            57: /*
        !            58:  * these can be patched with adb if the
        !            59:  * default values are inappropriate
        !            60:  */
        !            61: 
        !            62: int    hd_t1 = T1;
        !            63: int    hd_t3 = T3;
        !            64: int    hd_n2 = N2;
        !            65: 
        !            66: /*
        !            67:  *  HDLC TIMER 
        !            68:  *
        !            69:  *  This routine is called every 500ms by the kernel. Decrement timer by this
        !            70:  *  amount - if expired then process the event.
        !            71:  */
        !            72: 
        !            73: hd_timer ()
        !            74: {
        !            75:        register struct hdcb *hdp;
        !            76:        register int s = splimp ();
        !            77: 
        !            78:        for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
        !            79:                if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
        !            80:                        if (hdp->hd_lasttxnr != hdp->hd_vr)
        !            81:                                hd_writeinternal (hdp, RR, POLLOFF);
        !            82:                }
        !            83: 
        !            84:                if (!(hdp->hd_timer && --hdp->hd_timer == 0))
        !            85:                        continue;
        !            86: 
        !            87:                switch (hdp->hd_state) {
        !            88:                case INIT: 
        !            89:                case DISC_SENT:
        !            90:                        hd_writeinternal (hdp, DISC, POLLON);
        !            91:                        break;
        !            92: 
        !            93:                case ABM: 
        !            94:                        if (hdp->hd_lastrxnr != hdp->hd_vs) {   /* XXX */
        !            95:                                hdp->hd_timeouts++;
        !            96:                                hd_resend_iframe (hdp);
        !            97:                        }
        !            98:                        break;
        !            99: 
        !           100:                case WAIT_SABM: 
        !           101:                        hd_writeinternal (hdp, FRMR, POLLOFF);
        !           102:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           103:                                hdp->hd_retxcnt = 0;
        !           104:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           105:                                hdp->hd_state = WAIT_UA;
        !           106:                        }
        !           107:                        break;
        !           108: 
        !           109:                case DM_SENT: 
        !           110:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           111:                                /* Notify the packet level. */
        !           112:                                (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
        !           113:                                hdp->hd_retxcnt = 0;
        !           114:                                hdp->hd_state = SABM_SENT;
        !           115:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           116:                        } else
        !           117:                                hd_writeinternal (hdp, DM, POLLOFF);
        !           118:                        break;
        !           119: 
        !           120:                case WAIT_UA: 
        !           121:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           122:                                hdp->hd_retxcnt = 0;
        !           123:                                hd_writeinternal (hdp, DM, POLLOFF);
        !           124:                                hdp->hd_state = DM_SENT;
        !           125:                        } else
        !           126:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           127:                        break;
        !           128: 
        !           129:                case SABM_SENT: 
        !           130:                        /* Do this indefinitely. */
        !           131:                        hd_writeinternal (hdp, SABM, POLLON);
        !           132:                        break;
        !           133: 
        !           134:                case DISCONNECTED:
        !           135:                        /*
        !           136:                         * Poll the interface driver flags waiting
        !           137:                         * for the IFF_UP bit to come on.
        !           138:                         */
        !           139:                        if (hdp->hd_ifp->if_flags & IFF_UP)
        !           140:                                hdp->hd_state = INIT;
        !           141: 
        !           142:                }
        !           143:                SET_TIMER (hdp);
        !           144:        }
        !           145: 
        !           146:        splx (s);
        !           147: }

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