projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| a130a8be KS |
1 | /* |
| 2 | * Copyright (c) Computing Centre, University of British Columbia, 1984 | |
| 3 | * Copyright (C) Computer Science Department IV, | |
| 4 | * University of Erlangen-Nuremberg, Germany, 1990, 1992 | |
| 5 | * Copyright (c) 1990, 1992 Regents of the University of California. | |
| 51386eb2 | 6 | * All rights reserved. |
| a130a8be KS |
7 | * |
| 8 | * This code is derived from software contributed to Berkeley by the | |
| 9 | * Laboratory for Computation Vision and the Computer Science Department | |
| 10 | * of the the University of British Columbia and the Computer Science | |
| 11 | * Department (IV) of the University of Erlangen-Nuremberg, Germany. | |
| 51386eb2 KS |
12 | * |
| 13 | * %sccs.include.redist.c% | |
| 14 | * | |
| a130a8be | 15 | * @(#)pk_timer.c 7.7 (Berkeley) %G% |
| 51386eb2 | 16 | */ |
| 758293b0 | 17 | |
| 5548a02f KB |
18 | #include <sys/param.h> |
| 19 | #include <sys/systm.h> | |
| 20 | #include <sys/mbuf.h> | |
| 21 | #include <sys/socket.h> | |
| 22 | #include <sys/protosw.h> | |
| 23 | #include <sys/socketvar.h> | |
| 24 | #include <sys/errno.h> | |
| 758293b0 | 25 | |
| 5548a02f | 26 | #include <net/if.h> |
| 758293b0 | 27 | |
| 5548a02f KB |
28 | #include <netccitt/x25.h> |
| 29 | #include <netccitt/pk.h> | |
| 30 | #include <netccitt/pk_var.h> | |
| 758293b0 KS |
31 | |
| 32 | /* | |
| 33 | * Various timer values. They can be adjusted | |
| 34 | * by patching the binary with adb if necessary. | |
| 35 | */ | |
| 36 | int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */ | |
| 37 | int pk_t21 = 20 * PR_SLOWHZ; /* call timer */ | |
| 38 | /* XXX pk_t22 is never used */ | |
| 39 | int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */ | |
| 40 | int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */ | |
| 41 | ||
| 42 | pk_timer () | |
| 43 | { | |
| 44 | register struct pkcb *pkp; | |
| 45 | register struct pklcd *lcp, **pp; | |
| 46 | register int lcns_jammed, cant_restart; | |
| 47 | ||
| a130a8be | 48 | FOR_ALL_PKCBS(pkp) { |
| 758293b0 KS |
49 | switch (pkp -> pk_state) { |
| 50 | case DTE_SENT_RESTART: | |
| 51 | lcp = pkp -> pk_chan[0]; | |
| 52 | /* | |
| 53 | * If restart failures are common, a link level | |
| 54 | * reset should be initiated here. | |
| 55 | */ | |
| a130a8be | 56 | if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) { |
| 758293b0 KS |
57 | pk_message (0, pkp -> pk_xcp, |
| 58 | "packet level restart failed"); | |
| a130a8be KS |
59 | pkp -> pk_state = DTE_WAITING; |
| 60 | } | |
| 758293b0 KS |
61 | break; |
| 62 | ||
| 63 | case DTE_READY: | |
| 64 | lcns_jammed = cant_restart = 0; | |
| 65 | for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) { | |
| 66 | if ((lcp = *pp) == 0) | |
| 67 | continue; | |
| 68 | switch (lcp -> lcd_state) { | |
| 69 | case SENT_CALL: | |
| 70 | if (--lcp -> lcd_timer == 0) { | |
| dd4760db | 71 | if (lcp -> lcd_so) |
| 758293b0 | 72 | lcp -> lcd_so -> so_error = ETIMEDOUT; |
| dd4760db | 73 | pk_clear (lcp, 49, 1); |
| 758293b0 KS |
74 | } |
| 75 | break; | |
| 76 | ||
| 77 | case SENT_CLEAR: | |
| 78 | if (lcp -> lcd_retry >= 3) | |
| 79 | lcns_jammed++; | |
| 80 | else | |
| 81 | if (--lcp -> lcd_timer == 0) | |
| 700ea0e2 | 82 | pk_clear (lcp, 50, 1); |
| 758293b0 KS |
83 | break; |
| 84 | ||
| 85 | case DATA_TRANSFER: /* lcn active */ | |
| 86 | cant_restart++; | |
| 87 | break; | |
| a130a8be KS |
88 | |
| 89 | case LCN_ZOMBIE: /* zombie state */ | |
| 90 | pk_freelcd (lcp); | |
| 91 | break; | |
| 758293b0 KS |
92 | } |
| 93 | } | |
| 94 | if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) { | |
| 95 | pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed); | |
| 96 | pk_restart (pkp, 0); | |
| 97 | } | |
| 98 | } | |
| 99 | } | |
| 100 | } |