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\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: tcp-timer.fth
\
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
\
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\ or without modification, are permitted provided that the following
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\ this list of conditions and the following disclaimer.
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\ - Redistribution in binary form must reproduce the above copyright notice,
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\ may be used to endorse or promote products derived from this software
\ without specific prior written permission.
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\ This software is provided "AS IS," without a warranty of any kind.
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\ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
\ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
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\ ========== Copyright Header End ============================================
id: @(#)tcp-timer.fth 1.1 04/09/07
purpose: TCP timer management
copyright: Copyright 2004 Sun Microsystems, Inc. All Rights Reserved
copyright: Use is subject to license terms.
headerless
/timer instance buffer: tcp-fast-timer \ 200 ms timer
/timer instance buffer: tcp-slow-timer \ 500 ms timer
: tcp-start-fasttimer ( -- ) tcp-fast-timer d# 200 set-timer ;
: tcp-start-slowtimer ( -- ) tcp-slow-timer d# 500 set-timer ;
\ Start tracking fast and slow timeouts.
: tcp-start-timers ( -- )
tcp-start-fasttimer tcp-start-slowtimer ( )
;
\ Delayed ACK processing routine called once every 200 ms
: tcp-do-delacks ( inpcb -- )
inpcb>tcb dup tcb-flags@ TF_DELACK and if ( tcb )
dup TF_ACKNOW tcb-set-flags ( tcb )
dup tcp-output ( tcb )
then drop ( )
;
\ TCP protocol timeout routine called every 500 ms. Check timers
\ in all TCBs and causes FSM actions if timers have expired.
: tcp-process-timeouts ( inpcb -- )
inpcb>tcb ( tcb )
dup >tcbt-rexmit timer-expired? if ( tcb )
tcp-retransmit exit ( )
then ( tcb )
dup >tcbt-connect timer-expired? if ( tcb )
ETIMEDOUT tcp-drop exit ( )
then drop ( )
;
\ Handle TCP timer events
: tcp-do-timer-events ( -- )
tcp-fast-timer timer-expired? if ( )
tcp-start-fasttimer ( )
tcp-inpcb-list ['] tcp-do-delacks queue-iterate ( )
then ( )
tcp-slow-timer timer-expired? if ( )
tcp-start-slowtimer ( )
tcp-inpcb-list ['] tcp-process-timeouts queue-iterate ( )
then ( )
;
headers