Merge branch 'master' into gfs2

8 files changed, 189 insertions, 207 deletions

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index c39bff706cfc..090bc39e8199 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -2,7 +2,7 @@
  *  net/dccp/ccids/ccid3.c
  *
  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- *  Copyright (c) 2005-6 Ian McDonald <imcdnzl@gmail.com>
+ *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
  *
  *  An implementation of the DCCP protocol
  *
@@ -342,6 +342,8 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
 		new_packet->dccphtx_ccval =
 			DCCP_SKB_CB(skb)->dccpd_ccval =
 				hctx->ccid3hctx_last_win_count;
+		timeval_add_usecs(&hctx->ccid3hctx_t_nom,
+				  hctx->ccid3hctx_t_ipi);
 	}
 out:
 	return rc;
@@ -413,7 +415,8 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 	case TFRC_SSTATE_NO_FBACK:
 	case TFRC_SSTATE_FBACK:
 		if (len > 0) {
-			hctx->ccid3hctx_t_nom = now;
+			timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
+				  hctx->ccid3hctx_t_ipi);
 			ccid3_calc_new_t_ipi(hctx);
 			ccid3_calc_new_delta(hctx);
 			timeval_add_usecs(&hctx->ccid3hctx_t_nom,
@@ -757,8 +760,7 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 	}
 
 	hcrx->ccid3hcrx_tstamp_last_feedback = now;
-	hcrx->ccid3hcrx_last_counter	     = packet->dccphrx_ccval;
-	hcrx->ccid3hcrx_seqno_last_counter   = packet->dccphrx_seqno;
+	hcrx->ccid3hcrx_ccval_last_counter   = packet->dccphrx_ccval;
 	hcrx->ccid3hcrx_bytes_recv	     = 0;
 
 	/* Convert to multiples of 10us */
@@ -782,7 +784,7 @@ static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 	if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
 		return 0;
 
-	DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
+	DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_ccval_last_counter;
 
 	if (dccp_packet_without_ack(skb))
 		return 0;
@@ -854,6 +856,11 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 		interval = 1;
 	}
 found:
+	if (!tail) {
+		LIMIT_NETDEBUG(KERN_WARNING "%s: tail is null\n",
+		   __FUNCTION__);
+		return ~0;
+	}
 	rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
 	ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
 		       dccp_role(sk), sk, rtt);
@@ -864,9 +871,20 @@ found:
 	delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
 	x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
 
+	if (x_recv == 0)
+		x_recv = hcrx->ccid3hcrx_x_recv;
+
 	tmp1 = (u64)x_recv * (u64)rtt;
 	do_div(tmp1,10000000);
 	tmp2 = (u32)tmp1;
+
+	if (!tmp2) {
+		LIMIT_NETDEBUG(KERN_WARNING "tmp2 = 0 "
+		   "%s: x_recv = %u, rtt =%u\n",
+		   __FUNCTION__, x_recv, rtt);
+		return ~0;
+	}
+
 	fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
 	/* do not alter order above or you will get overflow on 32 bit */
 	p = tfrc_calc_x_reverse_lookup(fval);
@@ -882,31 +900,101 @@ found:
 static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
 {
 	struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+	struct dccp_li_hist_entry *next, *head;
+	u64 seq_temp;
 
-	if (seq_loss != DCCP_MAX_SEQNO + 1 &&
-	    list_empty(&hcrx->ccid3hcrx_li_hist)) {
-		struct dccp_li_hist_entry *li_tail;
+	if (list_empty(&hcrx->ccid3hcrx_li_hist)) {
+		if (!dccp_li_hist_interval_new(ccid3_li_hist,
+		   &hcrx->ccid3hcrx_li_hist, seq_loss, win_loss))
+			return;
 
-		li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
-						    &hcrx->ccid3hcrx_li_hist,
-						    seq_loss, win_loss);
-		if (li_tail == NULL)
+		next = (struct dccp_li_hist_entry *)
+		   hcrx->ccid3hcrx_li_hist.next;
+		next->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
+	} else {
+		struct dccp_li_hist_entry *entry;
+		struct list_head *tail;
+
+		head = (struct dccp_li_hist_entry *)
+		   hcrx->ccid3hcrx_li_hist.next;
+		/* FIXME win count check removed as was wrong */
+		/* should make this check with receive history */
+		/* and compare there as per section 10.2 of RFC4342 */
+
+		/* new loss event detected */
+		/* calculate last interval length */
+		seq_temp = dccp_delta_seqno(head->dccplih_seqno, seq_loss);
+		entry = dccp_li_hist_entry_new(ccid3_li_hist, SLAB_ATOMIC);
+
+		if (entry == NULL) {
+			printk(KERN_CRIT "%s: out of memory\n",__FUNCTION__);
+			dump_stack();
 			return;
-		li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
-	} else
-		    LIMIT_NETDEBUG(KERN_WARNING "%s: FIXME: find end of "
-				   "interval\n", __FUNCTION__);
+		}
+
+		list_add(&entry->dccplih_node, &hcrx->ccid3hcrx_li_hist);
+
+		tail = hcrx->ccid3hcrx_li_hist.prev;
+		list_del(tail);
+		kmem_cache_free(ccid3_li_hist->dccplih_slab, tail);
+
+		/* Create the newest interval */
+		entry->dccplih_seqno = seq_loss;
+		entry->dccplih_interval = seq_temp;
+		entry->dccplih_win_count = win_loss;
+	}
 }
 
-static void ccid3_hc_rx_detect_loss(struct sock *sk)
+static int ccid3_hc_rx_detect_loss(struct sock *sk,
+                                    struct dccp_rx_hist_entry *packet)
 {
 	struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
-	u8 win_loss;
-	const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
-						      &hcrx->ccid3hcrx_li_hist,
-						      &win_loss);
+	struct dccp_rx_hist_entry *rx_hist = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
+	u64 seqno = packet->dccphrx_seqno;
+	u64 tmp_seqno;
+	int loss = 0;
+	u8 ccval;
+
+
+	tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
+
+	if (!rx_hist ||
+	   follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
+		hcrx->ccid3hcrx_seqno_nonloss = seqno;
+		hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
+		goto detect_out;
+	}
+
 
-	ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
+	while (dccp_delta_seqno(hcrx->ccid3hcrx_seqno_nonloss, seqno)
+	   > TFRC_RECV_NUM_LATE_LOSS) {
+		loss = 1;
+		ccid3_hc_rx_update_li(sk, hcrx->ccid3hcrx_seqno_nonloss,
+		   hcrx->ccid3hcrx_ccval_nonloss);
+		tmp_seqno = hcrx->ccid3hcrx_seqno_nonloss;
+		dccp_inc_seqno(&tmp_seqno);
+		hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
+		dccp_inc_seqno(&tmp_seqno);
+		while (dccp_rx_hist_find_entry(&hcrx->ccid3hcrx_hist,
+		   tmp_seqno, &ccval)) {
+		   	hcrx->ccid3hcrx_seqno_nonloss = tmp_seqno;
+			hcrx->ccid3hcrx_ccval_nonloss = ccval;
+			dccp_inc_seqno(&tmp_seqno);
+		}
+	}
+
+	/* FIXME - this code could be simplified with above while */
+	/* but works at moment */
+	if (follows48(packet->dccphrx_seqno, hcrx->ccid3hcrx_seqno_nonloss)) {
+		hcrx->ccid3hcrx_seqno_nonloss = seqno;
+		hcrx->ccid3hcrx_ccval_nonloss = packet->dccphrx_ccval;
+	}
+
+detect_out:
+	dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
+		   &hcrx->ccid3hcrx_li_hist, packet,
+		   hcrx->ccid3hcrx_seqno_nonloss);
+	return loss;
 }
 
 static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
@@ -916,8 +1004,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 	struct dccp_rx_hist_entry *packet;
 	struct timeval now;
 	u8 win_count;
-	u32 p_prev, r_sample, t_elapsed;
-	int ins;
+	u32 p_prev, rtt_prev, r_sample, t_elapsed;
+	int loss;
 
 	BUG_ON(hcrx == NULL ||
 	       !(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
@@ -932,7 +1020,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 	case DCCP_PKT_DATAACK:
 		if (opt_recv->dccpor_timestamp_echo == 0)
 			break;
-		p_prev = hcrx->ccid3hcrx_rtt;
+		rtt_prev = hcrx->ccid3hcrx_rtt;
 		dccp_timestamp(sk, &now);
 		timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
 		r_sample = timeval_usecs(&now);
@@ -951,8 +1039,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 			hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
 					      r_sample / 10;
 
-		if (p_prev != hcrx->ccid3hcrx_rtt)
-			ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
+		if (rtt_prev != hcrx->ccid3hcrx_rtt)
+			ccid3_pr_debug("%s, New RTT=%uus, elapsed time=%u\n",
 				       dccp_role(sk), hcrx->ccid3hcrx_rtt,
 				       opt_recv->dccpor_elapsed_time);
 		break;
@@ -973,8 +1061,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 
 	win_count = packet->dccphrx_ccval;
 
-	ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
-				      &hcrx->ccid3hcrx_li_hist, packet);
+	loss = ccid3_hc_rx_detect_loss(sk, packet);
 
 	if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
 		return;
@@ -991,7 +1078,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 	case TFRC_RSTATE_DATA:
 		hcrx->ccid3hcrx_bytes_recv += skb->len -
 					      dccp_hdr(skb)->dccph_doff * 4;
-		if (ins != 0)
+		if (loss)
 			break;
 
 		dccp_timestamp(sk, &now);
@@ -1012,7 +1099,6 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 	ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
 		       dccp_role(sk), sk, dccp_state_name(sk->sk_state));
 
-	ccid3_hc_rx_detect_loss(sk);
 	p_prev = hcrx->ccid3hcrx_p;
 	
 	/* Calculate loss event rate */
@@ -1022,6 +1108,9 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		/* Scaling up by 1000000 as fixed decimal */
 		if (i_mean != 0)
 			hcrx->ccid3hcrx_p = 1000000 / i_mean;
+	} else {
+		printk(KERN_CRIT "%s: empty loss hist\n",__FUNCTION__);
+		dump_stack();
 	}
 
 	if (hcrx->ccid3hcrx_p > p_prev) {
@@ -1230,7 +1319,7 @@ static __exit void ccid3_module_exit(void)
 }
 module_exit(ccid3_module_exit);
 
-MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
+MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
 	      "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
 MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
 MODULE_LICENSE("GPL");
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 5ade4f668b22..0a2cb7536d26 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -1,13 +1,13 @@
 /*
  *  net/dccp/ccids/ccid3.h
  *
- *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
  *
  *  An implementation of the DCCP protocol
  *
  *  This code has been developed by the University of Waikato WAND
  *  research group. For further information please see http://www.wand.net.nz/
- *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *  or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
  *
  *  This code also uses code from Lulea University, rereleased as GPL by its
  *  authors:
@@ -120,9 +120,10 @@ struct ccid3_hc_rx_sock {
 #define ccid3hcrx_x_recv	ccid3hcrx_tfrc.tfrcrx_x_recv
 #define ccid3hcrx_rtt		ccid3hcrx_tfrc.tfrcrx_rtt
 #define ccid3hcrx_p		ccid3hcrx_tfrc.tfrcrx_p
-  	u64			ccid3hcrx_seqno_last_counter:48,
+  	u64			ccid3hcrx_seqno_nonloss:48,
+				ccid3hcrx_ccval_nonloss:4,
 				ccid3hcrx_state:8,
-				ccid3hcrx_last_counter:4;
+				ccid3hcrx_ccval_last_counter:4;
   	u32			ccid3hcrx_bytes_recv;
   	struct timeval		ccid3hcrx_tstamp_last_feedback;
   	struct timeval		ccid3hcrx_tstamp_last_ack;
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 5d7b7d864385..906c81ab9d4f 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -2,7 +2,7 @@
  *  net/dccp/ccids/lib/loss_interval.c
  *
  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *
  *  This program is free software; you can redistribute it and/or modify
@@ -12,6 +12,7 @@
  */
 
 #include <linux/module.h>
+#include <net/sock.h>
 
 #include "loss_interval.h"
 
@@ -90,13 +91,13 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
 	u32 w_tot  = 0;
 
 	list_for_each_entry_safe(li_entry, li_next, list, dccplih_node) {
-		if (i < DCCP_LI_HIST_IVAL_F_LENGTH) {
+		if (li_entry->dccplih_interval != ~0) {
 			i_tot0 += li_entry->dccplih_interval * dccp_li_hist_w[i];
 			w_tot  += dccp_li_hist_w[i];
+			if (i != 0)
+				i_tot1 += li_entry->dccplih_interval * dccp_li_hist_w[i - 1];
 		}
 
-		if (i != 0)
-			i_tot1 += li_entry->dccplih_interval * dccp_li_hist_w[i - 1];
 
 		if (++i > DCCP_LI_HIST_IVAL_F_LENGTH)
 			break;
@@ -107,37 +108,36 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
 
 	i_tot = max(i_tot0, i_tot1);
 
-	/* FIXME: Why do we do this? -Ian McDonald */
-	if (i_tot * 4 < w_tot)
-		i_tot = w_tot * 4;
+	if (!w_tot) {
+		LIMIT_NETDEBUG(KERN_WARNING "%s: w_tot = 0\n", __FUNCTION__);
+		return 1;
+	}
 
-	return i_tot * 4 / w_tot;
+	return i_tot / w_tot;
 }
 
 EXPORT_SYMBOL_GPL(dccp_li_hist_calc_i_mean);
 
-struct dccp_li_hist_entry *dccp_li_hist_interval_new(struct dccp_li_hist *hist,
-						     struct list_head *list,
-						     const u64 seq_loss,
-						     const u8 win_loss)
+int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
+   struct list_head *list, const u64 seq_loss, const u8 win_loss)
 {
-	struct dccp_li_hist_entry *tail = NULL, *entry;
+	struct dccp_li_hist_entry *entry;
 	int i;
 
-	for (i = 0; i <= DCCP_LI_HIST_IVAL_F_LENGTH; ++i) {
+	for (i = 0; i < DCCP_LI_HIST_IVAL_F_LENGTH; i++) {
 		entry = dccp_li_hist_entry_new(hist, SLAB_ATOMIC);
 		if (entry == NULL) {
 			dccp_li_hist_purge(hist, list);
-			return NULL;
+			dump_stack();
+			return 0;
 		}
-		if (tail == NULL)
-			tail = entry;
+		entry->dccplih_interval = ~0;
 		list_add(&entry->dccplih_node, list);
 	}
 
 	entry->dccplih_seqno     = seq_loss;
 	entry->dccplih_win_count = win_loss;
-	return tail;
+	return 1;
 }
 
 EXPORT_SYMBOL_GPL(dccp_li_hist_interval_new);
diff --git a/net/dccp/ccids/lib/loss_interval.h b/net/dccp/ccids/lib/loss_interval.h
index 43bf78269d1d..0ae85f0340b2 100644
--- a/net/dccp/ccids/lib/loss_interval.h
+++ b/net/dccp/ccids/lib/loss_interval.h
@@ -4,7 +4,7 @@
  *  net/dccp/ccids/lib/loss_interval.h
  *
  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *
  *  This program is free software; you can redistribute it and/or modify it
@@ -52,9 +52,6 @@ extern void dccp_li_hist_purge(struct dccp_li_hist *hist,
 
 extern u32 dccp_li_hist_calc_i_mean(struct list_head *list);
 
-extern struct dccp_li_hist_entry *
-			dccp_li_hist_interval_new(struct dccp_li_hist *hist,
-						  struct list_head *list,
-						  const u64 seq_loss,
-						  const u8 win_loss);
+extern int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
+   struct list_head *list, const u64 seq_loss, const u8 win_loss);
 #endif /* _DCCP_LI_HIST_ */
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index ad98d6a322eb..b876c9c81c65 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -1,13 +1,13 @@
 /*
- *  net/dccp/packet_history.h
+ *  net/dccp/packet_history.c
  *
- *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
  *
  *  An implementation of the DCCP protocol
  *
  *  This code has been developed by the University of Waikato WAND
  *  research group. For further information please see http://www.wand.net.nz/
- *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *  or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
  *
  *  This code also uses code from Lulea University, rereleased as GPL by its
  *  authors:
@@ -112,64 +112,27 @@ struct dccp_rx_hist_entry *
 
 EXPORT_SYMBOL_GPL(dccp_rx_hist_find_data_packet);
 
-int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
+void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
 			    struct list_head *rx_list,
 			    struct list_head *li_list,
-			    struct dccp_rx_hist_entry *packet)
+			    struct dccp_rx_hist_entry *packet,
+			    u64 nonloss_seqno)
 {
-	struct dccp_rx_hist_entry *entry, *next, *iter;
+	struct dccp_rx_hist_entry *entry, *next;
 	u8 num_later = 0;
 
-	iter = dccp_rx_hist_head(rx_list);
-	if (iter == NULL)
-		dccp_rx_hist_add_entry(rx_list, packet);
-	else {
-		const u64 seqno = packet->dccphrx_seqno;
-
-		if (after48(seqno, iter->dccphrx_seqno))
-			dccp_rx_hist_add_entry(rx_list, packet);
-		else {
-			if (dccp_rx_hist_entry_data_packet(iter))
-				num_later = 1;
-
-			list_for_each_entry_continue(iter, rx_list,
-						     dccphrx_node) {
-				if (after48(seqno, iter->dccphrx_seqno)) {
-					dccp_rx_hist_add_entry(&iter->dccphrx_node,
-							       packet);
-					goto trim_history;
-				}
-
-				if (dccp_rx_hist_entry_data_packet(iter))
-					num_later++;
+	list_add(&packet->dccphrx_node, rx_list);
 
-				if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
-					dccp_rx_hist_entry_delete(hist, packet);
-					return 1;
-				}
-			}
-
-			if (num_later < TFRC_RECV_NUM_LATE_LOSS)
-				dccp_rx_hist_add_entry(rx_list, packet);
-			/*
-			 * FIXME: else what? should we destroy the packet
-			 * like above?
-			 */
-		}
-	}
-
-trim_history:
-	/*
-	 * Trim history (remove all packets after the NUM_LATE_LOSS + 1
-	 * data packets)
-	 */
 	num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
 
 	if (!list_empty(li_list)) {
 		list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
 			if (num_later == 0) {
-				list_del_init(&entry->dccphrx_node);
-				dccp_rx_hist_entry_delete(hist, entry);
+				if (after48(nonloss_seqno,
+				   entry->dccphrx_seqno)) {
+					list_del_init(&entry->dccphrx_node);
+					dccp_rx_hist_entry_delete(hist, entry);
+				}
 			} else if (dccp_rx_hist_entry_data_packet(entry))
 				--num_later;
 		}
@@ -217,94 +180,10 @@ trim_history:
 				--num_later;
 		}
 	}
-
-	return 0;
 }
 
 EXPORT_SYMBOL_GPL(dccp_rx_hist_add_packet);
 
-u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
-			     struct list_head *li_list, u8 *win_loss)
-{
-	struct dccp_rx_hist_entry *entry, *next, *packet;
-	struct dccp_rx_hist_entry *a_loss = NULL;
-	struct dccp_rx_hist_entry *b_loss = NULL;
-	u64 seq_loss = DCCP_MAX_SEQNO + 1;
-	u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
-
-	list_for_each_entry_safe(entry, next, rx_list, dccphrx_node) {
-		if (num_later == 0) {
-			b_loss = entry;
-			break;
-		} else if (dccp_rx_hist_entry_data_packet(entry))
-			--num_later;
-	}
-
-	if (b_loss == NULL)
-		goto out;
-
-	num_later = 1;
-	list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
-		if (num_later == 0) {
-			a_loss = entry;
-			break;
-		} else if (dccp_rx_hist_entry_data_packet(entry))
-			--num_later;
-	}
-
-	if (a_loss == NULL) {
-		if (list_empty(li_list)) {
-			/* no loss event have occured yet */
-			LIMIT_NETDEBUG("%s: TODO: find a lost data packet by "
-				       "comparing to initial seqno\n",
-				       __FUNCTION__);
-			goto out;
-		} else {
-			LIMIT_NETDEBUG("%s: Less than 4 data pkts in history!",
-				       __FUNCTION__);
-			goto out;
-		}
-	}
-
-	/* Locate a lost data packet */
-	entry = packet = b_loss;
-	list_for_each_entry_safe_continue(entry, next, rx_list, dccphrx_node) {
-		u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
-					     packet->dccphrx_seqno);
-
-		if (delta != 0) {
-			if (dccp_rx_hist_entry_data_packet(packet))
-				--delta;
-			/*
-			 * FIXME: check this, probably this % usage is because
-			 * in earlier drafts the ndp count was just 8 bits
-			 * long, but now it cam be up to 24 bits long.
-			 */
-#if 0
-			if (delta % DCCP_NDP_LIMIT !=
-			    (packet->dccphrx_ndp -
-			     entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
-#endif
-			if (delta != packet->dccphrx_ndp - entry->dccphrx_ndp) {
-				seq_loss = entry->dccphrx_seqno;
-				dccp_inc_seqno(&seq_loss);
-			}
-		}
-		packet = entry;
-		if (packet == a_loss)
-			break;
-	}
-out:
-	if (seq_loss != DCCP_MAX_SEQNO + 1)
-		*win_loss = a_loss->dccphrx_ccval;
-	else
-		*win_loss = 0; /* Paranoia */
-
-	return seq_loss;
-}
-
-EXPORT_SYMBOL_GPL(dccp_rx_hist_detect_loss);
-
 struct dccp_tx_hist *dccp_tx_hist_new(const char *name)
 {
 	struct dccp_tx_hist *hist = kmalloc(sizeof(*hist), GFP_ATOMIC);
@@ -365,6 +244,25 @@ struct dccp_tx_hist_entry *
 
 EXPORT_SYMBOL_GPL(dccp_tx_hist_find_entry);
 
+int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
+   u8 *ccval)
+{
+	struct dccp_rx_hist_entry *packet = NULL, *entry;
+
+	list_for_each_entry(entry, list, dccphrx_node)
+		if (entry->dccphrx_seqno == seq) {
+			packet = entry;
+			break;
+		}
+
+	if (packet)
+		*ccval = packet->dccphrx_ccval;
+
+	return packet != NULL;
+}
+
+EXPORT_SYMBOL_GPL(dccp_rx_hist_find_entry);
+
 void dccp_tx_hist_purge_older(struct dccp_tx_hist *hist,
 			      struct list_head *list,
 			      struct dccp_tx_hist_entry *packet)
@@ -391,7 +289,7 @@ void dccp_tx_hist_purge(struct dccp_tx_hist *hist, struct list_head *list)
 
 EXPORT_SYMBOL_GPL(dccp_tx_hist_purge);
 
-MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
+MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>, "
 	      "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
 MODULE_DESCRIPTION("DCCP TFRC library");
 MODULE_LICENSE("GPL");
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 673c209e4e85..067cf1c85a37 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -1,13 +1,13 @@
 /*
  *  net/dccp/packet_history.h
  *
- *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
+ *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
  *
  *  An implementation of the DCCP protocol
  *
  *  This code has been developed by the University of Waikato WAND
  *  research group. For further information please see http://www.wand.net.nz/
- *  or e-mail Ian McDonald - iam4@cs.waikato.ac.nz
+ *  or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
  *
  *  This code also uses code from Lulea University, rereleased as GPL by its
  *  authors:
@@ -106,6 +106,8 @@ static inline void dccp_tx_hist_entry_delete(struct dccp_tx_hist *hist,
 extern struct dccp_tx_hist_entry *
 			dccp_tx_hist_find_entry(const struct list_head *list,
 						const u64 seq);
+extern int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
+   u8 *ccval);
 
 static inline void dccp_tx_hist_add_entry(struct list_head *list,
 					  struct dccp_tx_hist_entry *entry)
@@ -164,12 +166,6 @@ static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
 extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
 			       struct list_head *list);
 
-static inline void dccp_rx_hist_add_entry(struct list_head *list,
-					  struct dccp_rx_hist_entry *entry)
-{
-	list_add(&entry->dccphrx_node, list);
-}
-
 static inline struct dccp_rx_hist_entry *
 		dccp_rx_hist_head(struct list_head *list)
 {
@@ -188,10 +184,11 @@ static inline int
 	       entry->dccphrx_type == DCCP_PKT_DATAACK;
 }
 
-extern int dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
+extern void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
 				   struct list_head *rx_list,
 				   struct list_head *li_list,
-				   struct dccp_rx_hist_entry *packet);
+				   struct dccp_rx_hist_entry *packet,
+				   u64 nonloss_seqno);
 
 extern u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
 				    struct list_head *li_list, u8 *win_loss);
diff --git a/net/dccp/ccids/lib/tfrc.h b/net/dccp/ccids/lib/tfrc.h
index 130c4c40cfe3..45f30f59ea2a 100644
--- a/net/dccp/ccids/lib/tfrc.h
+++ b/net/dccp/ccids/lib/tfrc.h
@@ -4,7 +4,7 @@
  *  net/dccp/ccids/lib/tfrc.h
  *
  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
  *
diff --git a/net/dccp/ccids/lib/tfrc_equation.c b/net/dccp/ccids/lib/tfrc_equation.c
index 4fd2ebebf5a0..44076e0c6591 100644
--- a/net/dccp/ccids/lib/tfrc_equation.c
+++ b/net/dccp/ccids/lib/tfrc_equation.c
@@ -2,7 +2,7 @@
  *  net/dccp/ccids/lib/tfrc_equation.c
  *
  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
- *  Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
+ *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  *  Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
  *