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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: tcp-timer.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
6 | \ | |
7 | \ - Do no alter or remove copyright notices | |
8 | \ | |
9 | \ - Redistribution and use of this software in source and binary forms, with | |
10 | \ or without modification, are permitted provided that the following | |
11 | \ conditions are met: | |
12 | \ | |
13 | \ - Redistribution of source code must retain the above copyright notice, | |
14 | \ this list of conditions and the following disclaimer. | |
15 | \ | |
16 | \ - Redistribution in binary form must reproduce the above copyright notice, | |
17 | \ this list of conditions and the following disclaimer in the | |
18 | \ documentation and/or other materials provided with the distribution. | |
19 | \ | |
20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
23 | \ | |
24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
28 | \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
30 | \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
31 | \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
32 | \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
33 | \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
34 | \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
35 | \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
36 | \ | |
37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | id: @(#)tcp-timer.fth 1.1 04/09/07 | |
43 | purpose: TCP timer management | |
44 | copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved | |
45 | copyright: Use is subject to license terms. | |
46 | ||
47 | headerless | |
48 | ||
49 | /timer instance buffer: tcp-fast-timer \ 200 ms timer | |
50 | /timer instance buffer: tcp-slow-timer \ 500 ms timer | |
51 | ||
52 | : tcp-start-fasttimer ( -- ) tcp-fast-timer d# 200 set-timer ; | |
53 | : tcp-start-slowtimer ( -- ) tcp-slow-timer d# 500 set-timer ; | |
54 | ||
55 | \ Start tracking fast and slow timeouts. | |
56 | : tcp-start-timers ( -- ) | |
57 | tcp-start-fasttimer tcp-start-slowtimer ( ) | |
58 | ; | |
59 | ||
60 | \ Delayed ACK processing routine called once every 200 ms | |
61 | : tcp-do-delacks ( inpcb -- ) | |
62 | inpcb>tcb dup tcb-flags@ TF_DELACK and if ( tcb ) | |
63 | dup TF_ACKNOW tcb-set-flags ( tcb ) | |
64 | dup tcp-output ( tcb ) | |
65 | then drop ( ) | |
66 | ; | |
67 | ||
68 | \ TCP protocol timeout routine called every 500 ms. Check timers | |
69 | \ in all TCBs and causes FSM actions if timers have expired. | |
70 | : tcp-process-timeouts ( inpcb -- ) | |
71 | inpcb>tcb ( tcb ) | |
72 | dup >tcbt-rexmit timer-expired? if ( tcb ) | |
73 | tcp-retransmit exit ( ) | |
74 | then ( tcb ) | |
75 | dup >tcbt-connect timer-expired? if ( tcb ) | |
76 | ETIMEDOUT tcp-drop exit ( ) | |
77 | then drop ( ) | |
78 | ; | |
79 | ||
80 | \ Handle TCP timer events | |
81 | : tcp-do-timer-events ( -- ) | |
82 | tcp-fast-timer timer-expired? if ( ) | |
83 | tcp-start-fasttimer ( ) | |
84 | tcp-inpcb-list ['] tcp-do-delacks queue-iterate ( ) | |
85 | then ( ) | |
86 | tcp-slow-timer timer-expired? if ( ) | |
87 | tcp-start-slowtimer ( ) | |
88 | tcp-inpcb-list ['] tcp-process-timeouts queue-iterate ( ) | |
89 | then ( ) | |
90 | ; | |
91 | ||
92 | headers |