Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netccitt/hd_timer.c
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1 /* $NetBSD: hd_timer.c,v 1.12 2005/02/26 22:45:10 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Laboratory for Computation Vision and the Computer Science Department 9 * of the University of British Columbia. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)hd_timer.c 8.1 (Berkeley) 6/10/93 36 */ 37 38 /* 39 * Copyright (c) 1984 University of British Columbia. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * the Laboratory for Computation Vision and the Computer Science Department 43 * of the University of British Columbia. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. All advertising materials mentioning features or use of this software 54 * must display the following acknowledgement: 55 * This product includes software developed by the University of 56 * California, Berkeley and its contributors. 57 * 4. Neither the name of the University nor the names of its contributors 58 * may be used to endorse or promote products derived from this software 59 * without specific prior written permission. 60 * 61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 71 * SUCH DAMAGE. 72 * 73 * @(#)hd_timer.c 8.1 (Berkeley) 6/10/93 74 */ 75 76 #include <sys/cdefs.h> 77 __KERNEL_RCSID(0, "$NetBSD: hd_timer.c,v 1.12 2005/02/26 22:45:10 perry Exp $"); 78 79 #include <sys/param.h> 80 #include <sys/systm.h> 81 #include <sys/mbuf.h> 82 #include <sys/domain.h> 83 #include <sys/socket.h> 84 #include <sys/protosw.h> 85 #include <sys/errno.h> 86 #include <sys/time.h> 87 #include <sys/kernel.h> 88 89 #include <net/if.h> 90 91 #include <netccitt/hdlc.h> 92 #include <netccitt/hd_var.h> 93 #include <netccitt/x25.h> 94 #include <netccitt/pk_extern.h> 95 96 /* 97 * these can be patched with adb if the 98 * default values are inappropriate 99 */ 100 101 int hd_t1 = T1; 102 int hd_t3 = T3; 103 int hd_n2 = N2; 104 105 /* 106 * HDLC TIMER 107 * 108 * This routine is called every 500ms by the kernel. Decrement timer by this 109 * amount - if expired then process the event. 110 */ 111 112 void 113 hd_timer() 114 { 115 struct hdcb *hdp; 116 int s = splnet(); 117 118 for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) { 119 if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) { 120 if (hdp->hd_lasttxnr != hdp->hd_vr) 121 hd_writeinternal(hdp, RR, POLLOFF); 122 } 123 if (!(hdp->hd_timer && --hdp->hd_timer == 0)) 124 continue; 125 126 switch (hdp->hd_state) { 127 case INIT: 128 case DISC_SENT: 129 hd_writeinternal(hdp, DISC, POLLON); 130 break; 131 132 case ABM: 133 if (hdp->hd_lastrxnr != hdp->hd_vs) { /* XXX */ 134 hdp->hd_timeouts++; 135 hd_resend_iframe(hdp); 136 } 137 break; 138 139 case WAIT_SABM: 140 hd_writeinternal(hdp, FRMR, POLLOFF); 141 if (++hdp->hd_retxcnt == hd_n2) { 142 hdp->hd_retxcnt = 0; 143 hd_writeinternal(hdp, SABM, POLLOFF); 144 hdp->hd_state = WAIT_UA; 145 } 146 break; 147 148 case DM_SENT: 149 if (++hdp->hd_retxcnt == hd_n2) { 150 /* Notify the packet level. */ 151 (void) pk_ctlinput(PRC_LINKDOWN, 152 (struct sockaddr *) hdp->hd_pkp, NULL); 153 hdp->hd_retxcnt = 0; 154 hdp->hd_state = SABM_SENT; 155 hd_writeinternal(hdp, SABM, POLLOFF); 156 } else 157 hd_writeinternal(hdp, DM, POLLOFF); 158 break; 159 160 case WAIT_UA: 161 if (++hdp->hd_retxcnt == hd_n2) { 162 hdp->hd_retxcnt = 0; 163 hd_writeinternal(hdp, DM, POLLOFF); 164 hdp->hd_state = DM_SENT; 165 } else 166 hd_writeinternal(hdp, SABM, POLLOFF); 167 break; 168 169 case SABM_SENT: 170 /* Do this indefinitely. */ 171 hd_writeinternal(hdp, SABM, POLLON); 172 break; 173 174 case DISCONNECTED: 175 /* 176 * Poll the interface driver flags waiting 177 * for the IFF_UP bit to come on. 178 */ 179 if (hdp->hd_ifp->if_flags & IFF_UP) 180 hdp->hd_state = INIT; 181 182 } 183 SET_TIMER(hdp); 184 } 185 186 splx(s); 187 }
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