1 files changed, 0 insertions, 192 deletions
diff --git a/gpxe/src/net/retry.c b/gpxe/src/net/retry.c
deleted file mode 100644
index 40f656f2..00000000
--- a/gpxe/src/net/retry.c
+++ /dev/null
@@ -1,192 +0,0 @@
-/*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-FILE_LICENCE ( GPL2_OR_LATER );
-
-#include <stddef.h>
-#include <gpxe/timer.h>
-#include <gpxe/list.h>
-#include <gpxe/process.h>
-#include <gpxe/init.h>
-#include <gpxe/retry.h>
-
-/** @file
- *
- * Retry timers
- *
- * A retry timer is a binary exponential backoff timer.  It can be
- * used to build automatic retransmission into network protocols.
- *
- * This implementation of the timer is designed to satisfy RFC 2988
- * and therefore be usable as a TCP retransmission timer.
- *
- * 
- */
-
-/* The theoretical minimum that the algorithm in stop_timer() can
- * adjust the timeout back down to is seven ticks, so set the minimum
- * timeout to at least that value for the sake of consistency.
- */
-#define MIN_TIMEOUT 7
-
-/** List of running timers */
-static LIST_HEAD ( timers );
-
-/**
- * Start timer
- *
- * @v timer		Retry timer
- *
- * This starts the timer running with the current timeout value.  If
- * stop_timer() is not called before the timer expires, the timer will
- * be stopped and the timer's callback function will be called.
- */
-void start_timer ( struct retry_timer *timer ) {
-	if ( ! timer->running )
-		list_add ( &timer->list, &timers );
-	timer->start = currticks();
-	timer->running = 1;
-
-	/* 0 means "use default timeout" */
-	if ( timer->min_timeout == 0 )
-		timer->min_timeout = DEFAULT_MIN_TIMEOUT;
-	/* We must never be less than MIN_TIMEOUT under any circumstances */
-	if ( timer->min_timeout < MIN_TIMEOUT )
-		timer->min_timeout = MIN_TIMEOUT;
-	/* Honor user-specified minimum timeout */
-	if ( timer->timeout < timer->min_timeout )
-		timer->timeout = timer->min_timeout;
-
-	DBG2 ( "Timer %p started at time %ld (expires at %ld)\n",
-	       timer, timer->start, ( timer->start + timer->timeout ) );
-}
-
-/**
- * Start timer with a specified fixed timeout
- *
- * @v timer		Retry timer
- * @v timeout		Timeout, in ticks
- */
-void start_timer_fixed ( struct retry_timer *timer, unsigned long timeout ) {
-	start_timer ( timer );
-	timer->timeout = timeout;
-	DBG2 ( "Timer %p expiry time changed to %ld\n",
-	       timer, ( timer->start + timer->timeout ) );
-}
-
-/**
- * Stop timer
- *
- * @v timer		Retry timer
- *
- * This stops the timer and updates the timer's timeout value.
- */
-void stop_timer ( struct retry_timer *timer ) {
-	unsigned long old_timeout = timer->timeout;
-	unsigned long now = currticks();
-	unsigned long runtime;
-
-	/* If timer was already stopped, do nothing */
-	if ( ! timer->running )
-		return;
-
-	list_del ( &timer->list );
-	runtime = ( now - timer->start );
-	timer->running = 0;
-	DBG2 ( "Timer %p stopped at time %ld (ran for %ld)\n",
-	       timer, now, runtime );
-
-	/* Update timer.  Variables are:
-	 *
-	 *   r = round-trip time estimate (i.e. runtime)
-	 *   t = timeout value (i.e. timer->timeout)
-	 *   s = smoothed round-trip time
-	 *
-	 * By choice, we set t = 4s, i.e. allow for four times the
-	 * normal round-trip time to pass before retransmitting.
-	 *
-	 * We want to smooth according to s := ( 7 s + r ) / 8
-	 *
-	 * Since we don't actually store s, this reduces to
-	 * t := ( 7 t / 8 ) + ( r / 2 )
-	 *
-	 */
-	if ( timer->count ) {
-		timer->count--;
-	} else {
-		timer->timeout -= ( timer->timeout >> 3 );
-		timer->timeout += ( runtime >> 1 );
-		if ( timer->timeout != old_timeout ) {
-			DBG ( "Timer %p timeout updated to %ld\n",
-			      timer, timer->timeout );
-		}
-	}
-}
-
-/**
- * Handle expired timer
- *
- * @v timer		Retry timer
- */
-static void timer_expired ( struct retry_timer *timer ) {
-	int fail;
-
-	/* Stop timer without performing RTT calculations */
-	DBG2 ( "Timer %p stopped at time %ld on expiry\n",
-	       timer, currticks() );
-	assert ( timer->running );
-	list_del ( &timer->list );
-	timer->running = 0;
-	timer->count++;
-
-	/* Back off the timeout value */
-	timer->timeout <<= 1;
-	if ( timer->max_timeout == 0 ) /* 0 means "use default timeout" */
-		timer->max_timeout = DEFAULT_MAX_TIMEOUT;
-	if ( ( fail = ( timer->timeout > timer->max_timeout ) ) )
-		timer->timeout = timer->max_timeout;
-	DBG ( "Timer %p timeout backed off to %ld\n",
-	      timer, timer->timeout );
-
-	/* Call expiry callback */
-	timer->expired ( timer, fail );	
-}
-
-/**
- * Single-step the retry timer list
- *
- * @v process		Retry timer process
- */
-static void retry_step ( struct process *process __unused ) {
-	struct retry_timer *timer;
-	struct retry_timer *tmp;
-	unsigned long now = currticks();
-	unsigned long used;
-
-	list_for_each_entry_safe ( timer, tmp, &timers, list ) {
-		used = ( now - timer->start );
-		if ( used >= timer->timeout )
-			timer_expired ( timer );
-	}
-}
-
-/** Retry timer process */
-struct process retry_process __permanent_process = {
-	.list = LIST_HEAD_INIT ( retry_process.list ),
-	.step = retry_step,
-};