projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 51386eb2 KS |
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 | * %sccs.include.redist.c% | |
| 11 | * | |
| 4507dea2 | 12 | * @(#)pk_timer.c 7.3 (Berkeley) %G% |
| 51386eb2 | 13 | */ |
| 758293b0 | 14 | |
| 4507dea2 KS |
15 | #include "param.h" |
| 16 | #include "systm.h" | |
| 17 | #include "mbuf.h" | |
| 18 | #include "socket.h" | |
| 19 | #include "protosw.h" | |
| 20 | #include "socketvar.h" | |
| 21 | #include "errno.h" | |
| 758293b0 KS |
22 | |
| 23 | #include "../net/if.h" | |
| 24 | ||
| 4507dea2 KS |
25 | #include "x25.h" |
| 26 | #include "pk.h" | |
| 27 | #include "pk_var.h" | |
| 758293b0 KS |
28 | |
| 29 | /* | |
| 30 | * Various timer values. They can be adjusted | |
| 31 | * by patching the binary with adb if necessary. | |
| 32 | */ | |
| 33 | int pk_t20 = 18 * PR_SLOWHZ; /* restart timer */ | |
| 34 | int pk_t21 = 20 * PR_SLOWHZ; /* call timer */ | |
| 35 | /* XXX pk_t22 is never used */ | |
| 36 | int pk_t22 = 18 * PR_SLOWHZ; /* reset timer */ | |
| 37 | int pk_t23 = 18 * PR_SLOWHZ; /* clear timer */ | |
| 38 | ||
| 39 | pk_timer () | |
| 40 | { | |
| 41 | register struct pkcb *pkp; | |
| 42 | register struct pklcd *lcp, **pp; | |
| 43 | register int lcns_jammed, cant_restart; | |
| 44 | ||
| 45 | for (pkp = pkcbhead; pkp; pkp = pkp->pk_next) { | |
| 46 | switch (pkp -> pk_state) { | |
| 47 | case DTE_SENT_RESTART: | |
| 48 | lcp = pkp -> pk_chan[0]; | |
| 49 | /* | |
| 50 | * If restart failures are common, a link level | |
| 51 | * reset should be initiated here. | |
| 52 | */ | |
| 53 | if (lcp -> lcd_timer && --lcp -> lcd_timer == 0) | |
| 54 | pk_message (0, pkp -> pk_xcp, | |
| 55 | "packet level restart failed"); | |
| 56 | break; | |
| 57 | ||
| 58 | case DTE_READY: | |
| 59 | lcns_jammed = cant_restart = 0; | |
| 60 | for (pp = &pkp -> pk_chan[1]; pp <= &pkp -> pk_chan[pkp -> pk_maxlcn]; pp++) { | |
| 61 | if ((lcp = *pp) == 0) | |
| 62 | continue; | |
| 63 | switch (lcp -> lcd_state) { | |
| 64 | case SENT_CALL: | |
| 65 | if (--lcp -> lcd_timer == 0) { | |
| 66 | lcp -> lcd_so -> so_error = ETIMEDOUT; | |
| 67 | pk_clear (lcp); | |
| 68 | } | |
| 69 | break; | |
| 70 | ||
| 71 | case SENT_CLEAR: | |
| 72 | if (lcp -> lcd_retry >= 3) | |
| 73 | lcns_jammed++; | |
| 74 | else | |
| 75 | if (--lcp -> lcd_timer == 0) | |
| 76 | pk_clear (lcp); | |
| 77 | break; | |
| 78 | ||
| 79 | case DATA_TRANSFER: /* lcn active */ | |
| 80 | cant_restart++; | |
| 81 | break; | |
| 82 | } | |
| 83 | } | |
| 84 | if (lcns_jammed > pkp -> pk_maxlcn / 2 && cant_restart == 0) { | |
| 85 | pk_message (0, pkp -> pk_xcp, "%d lcns jammed: attempting restart", lcns_jammed); | |
| 86 | pk_restart (pkp, 0); | |
| 87 | } | |
| 88 | } | |
| 89 | } | |
| 90 | } |