[CCID3]: Separate most of the packet history code

This also changes the list_for_each_entry_safe_continue behaviour to match its
kerneldoc comment, that is, to start after the pos passed.

Also adds several helper functions from previously open coded fragments, making
the code more clear.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

2 files changed, 134 insertions, 211 deletions

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index df4adfe..15c25f6 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -34,8 +34,10 @@
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/config.h>
 #include "../ccid.h"
 #include "../dccp.h"
+#include "../packet_history.h"
 #include "ccid3.h"
 
 #ifdef CCID3_DEBUG
@@ -82,60 +84,10 @@ enum ccid3_options {
 
 static int ccid3_debug;
 
-static kmem_cache_t *ccid3_tx_hist_slab;
-static kmem_cache_t *ccid3_rx_hist_slab;
-static kmem_cache_t *ccid3_loss_interval_hist_slab;
-
-static inline struct ccid3_tx_hist_entry *ccid3_tx_hist_entry_new(int prio)
-{
-	struct ccid3_tx_hist_entry *entry = kmem_cache_alloc(ccid3_tx_hist_slab, prio);
-
-	if (entry != NULL)
-		entry->ccid3htx_sent = 0;
-
-	return entry;
-}
-
-static inline void ccid3_tx_hist_entry_delete(struct ccid3_tx_hist_entry *entry)
-{
-	if (entry != NULL)
-		kmem_cache_free(ccid3_tx_hist_slab, entry);
-}
-
-static inline struct ccid3_rx_hist_entry *ccid3_rx_hist_entry_new(struct sock *sk,
-								  struct sk_buff *skb,
-								  int prio)
-{
-	struct ccid3_rx_hist_entry *entry = kmem_cache_alloc(ccid3_rx_hist_slab, prio);
-
-	if (entry != NULL) {
-		const struct dccp_hdr *dh = dccp_hdr(skb);
-
-		entry->ccid3hrx_seqno	  = DCCP_SKB_CB(skb)->dccpd_seq;
-		entry->ccid3hrx_win_count = dh->dccph_ccval;
-		entry->ccid3hrx_type	  = dh->dccph_type;
-		entry->ccid3hrx_ndp 	  = dccp_sk(sk)->dccps_options_received.dccpor_ndp;
-		do_gettimeofday(&(entry->ccid3hrx_tstamp));
-	}
-
-	return entry;
-}
-
-static inline void ccid3_rx_hist_entry_delete(struct ccid3_rx_hist_entry *entry)
-{
-	if (entry != NULL)
-		kmem_cache_free(ccid3_rx_hist_slab, entry);
-}
+struct dccp_tx_hist *ccid3_tx_hist;
+struct dccp_rx_hist *ccid3_rx_hist;
 
-static void ccid3_rx_history_delete(struct list_head *hist)
-{
-	struct ccid3_rx_hist_entry *entry, *next;
-
-	list_for_each_entry_safe(entry, next, hist, ccid3hrx_node) {
-		list_del_init(&entry->ccid3hrx_node);
-		kmem_cache_free(ccid3_rx_hist_slab, entry);
-	}
-}
+static kmem_cache_t *ccid3_loss_interval_hist_slab;
 
 static inline struct ccid3_loss_interval_hist_entry *ccid3_loss_interval_hist_entry_new(int prio)
 {
@@ -982,7 +934,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
-	struct ccid3_tx_hist_entry *new_packet = NULL;
+	struct dccp_tx_hist_entry *new_packet;
 	struct timeval now;
 	long delay;
 	int rc = -ENOTCONN;
@@ -997,12 +949,9 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
 		goto out;
 
 	/* See if last packet allocated was not sent */
-	if (!list_empty(&hctx->ccid3hctx_hist))
-		new_packet = list_entry(hctx->ccid3hctx_hist.next,
-					struct ccid3_tx_hist_entry, ccid3htx_node);
-
-	if (new_packet == NULL || new_packet->ccid3htx_sent) {
-		new_packet = ccid3_tx_hist_entry_new(SLAB_ATOMIC);
+	new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
+	if (new_packet == NULL || new_packet->dccphtx_sent) {
+		new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, SLAB_ATOMIC);
 
 		rc = -ENOBUFS;
 		if (new_packet == NULL) {
@@ -1011,7 +960,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
 			goto out;
 		}
 
-		list_add(&new_packet->ccid3htx_node, &hctx->ccid3hctx_hist);
+		dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
 	}
 
 	do_gettimeofday(&now);
@@ -1054,7 +1003,9 @@ static int ccid3_hc_tx_send_packet(struct sock *sk,
 
 	/* Can we send? if so add options and add to packet history */
 	if (rc == 0)
-		new_packet->ccid3htx_win_count = DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
+		new_packet->dccphtx_win_count =
+			DCCP_SKB_CB(skb)->dccpd_ccval =
+				hctx->ccid3hctx_last_win_count;
 out:
 	return rc;
 }
@@ -1063,7 +1014,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
-	struct ccid3_tx_hist_entry *packet = NULL;
 	struct timeval now;
 
 //	ccid3_pr_debug("%s, sk=%p, more=%d, len=%d\n", dccp_role(sk), sk, more, len);
@@ -1080,20 +1030,23 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 	/* check if we have sent a data packet */
 	if (len > 0) {
 		unsigned long quarter_rtt;
+		struct dccp_tx_hist_entry *packet;
 
-		if (list_empty(&hctx->ccid3hctx_hist)) {
+		packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
+		if (packet == NULL) {
 			printk(KERN_CRIT "%s: packet doesn't exists in history!\n", __FUNCTION__);
 			return;
 		}
-		packet = list_entry(hctx->ccid3hctx_hist.next, struct ccid3_tx_hist_entry, ccid3htx_node);
-		if (packet->ccid3htx_sent) {
+		if (packet->dccphtx_sent) {
 			printk(KERN_CRIT "%s: no unsent packet in history!\n", __FUNCTION__);
 			return;
 		}
-		packet->ccid3htx_tstamp = now;
-		packet->ccid3htx_seqno  = dp->dccps_gss;
-		// ccid3_pr_debug("%s, sk=%p, seqno=%llu inserted!\n", dccp_role(sk), sk, packet->ccid3htx_seqno);
-
+		packet->dccphtx_tstamp = now;
+		packet->dccphtx_seqno  = dp->dccps_gss;
+#if 0
+		ccid3_pr_debug("%s, sk=%p, seqno=%llu inserted!\n",
+			       dccp_role(sk), sk, packet->dccphtx_seqno);
+#endif
 		/*
 		 * Check if win_count have changed */
 		/* COMPLIANCE_BEGIN
@@ -1106,18 +1059,18 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
 							    min_t(unsigned long, quarter_rtt, 5)) % 16;
 			ccid3_pr_debug("%s, sk=%p, window changed from %u to %u!\n",
 				       dccp_role(sk), sk,
-				       packet->ccid3htx_win_count,
+				       packet->dccphtx_win_count,
 				       hctx->ccid3hctx_last_win_count);
 		}
 		/* COMPLIANCE_END */
 #if 0
 		ccid3_pr_debug("%s, sk=%p, packet sent (%llu,%u)\n",
 			       dccp_role(sk), sk,
-			       packet->ccid3htx_seqno,
-			       packet->ccid3htx_win_count);
+			       packet->dccphtx_seqno,
+			       packet->dccphtx_win_count);
 #endif
 		hctx->ccid3hctx_idle = 0;
-		packet->ccid3htx_sent = 1;
+		packet->dccphtx_sent = 1;
 	} else
 		ccid3_pr_debug("%s, sk=%p, seqno=%llu NOT inserted!\n",
 			       dccp_role(sk), sk, dp->dccps_gss);
@@ -1152,7 +1105,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
 	struct ccid3_options_received *opt_recv;
-	struct ccid3_tx_hist_entry *entry, *next, *packet;
+	struct dccp_tx_hist_entry *packet;
 	unsigned long next_tmout; 
 	u16 t_elapsed;
 	u32 pinv;
@@ -1191,13 +1144,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		/* Calculate new round trip sample by
 		 * R_sample = (now - t_recvdata) - t_delay */
 		/* get t_recvdata from history */
-		packet = NULL;
-		list_for_each_entry_safe(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node)
-			if (entry->ccid3htx_seqno == DCCP_SKB_CB(skb)->dccpd_ack_seq) {
-				packet = entry;
-				break;
-			}
-
+		packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
+						 DCCP_SKB_CB(skb)->dccpd_ack_seq);
 		if (packet == NULL) {
 			ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't exist in history!\n",
 				       dccp_role(sk), sk, DCCP_SKB_CB(skb)->dccpd_ack_seq,
@@ -1206,7 +1154,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		}
 
 		/* Update RTT */
-		r_sample = now_delta(packet->ccid3htx_tstamp);
+		r_sample = now_delta(packet->dccphtx_tstamp);
 		/* FIXME: */
 		// r_sample -= usecs_to_jiffies(t_elapsed * 10);
 
@@ -1273,10 +1221,9 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		ccid3_calc_new_delta(hctx);
 
 		/* remove all packets older than the one acked from history */
-		list_for_each_entry_safe_continue(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node) {
-			list_del_init(&entry->ccid3htx_node);
-			ccid3_tx_hist_entry_delete(entry);
-		}
+		dccp_tx_hist_purge_older(ccid3_tx_hist,
+					 &hctx->ccid3hctx_hist, packet);
+
 		if (hctx->ccid3hctx_x < 10) {
 			ccid3_pr_debug("ccid3_hc_tx_packet_recv hctx->ccid3hctx_x < 10\n");
 			hctx->ccid3hctx_x = 10;
@@ -1285,7 +1232,8 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 
 		/* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
 		next_tmout = max(inet_csk(sk)->icsk_rto,
-			2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x/10));
+				 (2 * (hctx->ccid3hctx_s * 100000) /
+				  (hctx->ccid3hctx_x / 10)));
 		/* maths with 100000 and 10 is to prevent overflow with 32 bit */
 
 		ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to expire in %lu jiffies (%luus)\n",
@@ -1408,7 +1356,6 @@ static void ccid3_hc_tx_exit(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
-	struct ccid3_tx_hist_entry *entry, *next;
 
 	ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 	BUG_ON(hctx == NULL);
@@ -1417,10 +1364,7 @@ static void ccid3_hc_tx_exit(struct sock *sk)
 	sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
 
 	/* Empty packet history */
-	list_for_each_entry_safe(entry, next, &hctx->ccid3hctx_hist, ccid3htx_node) {
-		list_del_init(&entry->ccid3htx_node);
-		ccid3_tx_hist_entry_delete(entry);
-	}
+	dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
 
 	kfree(dp->dccps_hc_tx_ccid_private);
 	dp->dccps_hc_tx_ccid_private = NULL;
@@ -1462,39 +1406,40 @@ static inline void ccid3_hc_rx_set_state(struct sock *sk, enum ccid3_hc_rx_state
 	hcrx->ccid3hcrx_state = state;
 }
 
-static int ccid3_hc_rx_add_hist(struct sock *sk, struct ccid3_rx_hist_entry *packet)
+static int ccid3_hc_rx_add_hist(struct sock *sk,
+				struct dccp_rx_hist_entry *packet)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
-	struct ccid3_rx_hist_entry *entry, *next;
+	struct dccp_rx_hist_entry *entry, *next, *iter;
 	u8 num_later = 0;
 
-	if (list_empty(&hcrx->ccid3hcrx_hist))
-		list_add(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+	iter = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
+	if (iter == NULL)
+		dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
 	else {
-		u64 seqno = packet->ccid3hrx_seqno;
-		struct ccid3_rx_hist_entry *iter = list_entry(hcrx->ccid3hcrx_hist.next,
-							      struct ccid3_rx_hist_entry,
-							      ccid3hrx_node);
-		if (after48(seqno, iter->ccid3hrx_seqno))
-			list_add(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+		const u64 seqno = packet->dccphrx_seqno;
+
+		if (after48(seqno, iter->dccphrx_seqno))
+			dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
 		else {
-			if (iter->ccid3hrx_type == DCCP_PKT_DATA ||
-			    iter->ccid3hrx_type == DCCP_PKT_DATAACK)
+			if (dccp_rx_hist_entry_data_packet(iter))
 				num_later = 1;
 
-			list_for_each_entry_continue(iter, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
-				if (after48(seqno, iter->ccid3hrx_seqno)) {
-					list_add(&packet->ccid3hrx_node, &iter->ccid3hrx_node);
+			list_for_each_entry_continue(iter,
+						     &hcrx->ccid3hcrx_hist,
+						     dccphrx_node) {
+				if (after48(seqno, iter->dccphrx_seqno)) {
+					dccp_rx_hist_add_entry(&iter->dccphrx_node,
+							       packet);
 					goto trim_history;
 				}
 
-				if (iter->ccid3hrx_type == DCCP_PKT_DATA ||
-				    iter->ccid3hrx_type == DCCP_PKT_DATAACK)
+				if (dccp_rx_hist_entry_data_packet(iter))
 					num_later++;
 
 				if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
-					ccid3_rx_hist_entry_delete(packet);
+					dccp_rx_hist_entry_delete(ccid3_rx_hist, packet);
 					ccid3_pr_debug("%s, sk=%p, packet(%llu) already lost!\n",
 						       dccp_role(sk), sk, seqno);
 					return 1;
@@ -1502,7 +1447,8 @@ static int ccid3_hc_rx_add_hist(struct sock *sk, struct ccid3_rx_hist_entry *pac
 			}
 
 			if (num_later < TFRC_RECV_NUM_LATE_LOSS)
-				list_add_tail(&packet->ccid3hrx_node, &hcrx->ccid3hcrx_hist);
+				dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist,
+						       packet);
 			/* FIXME: else what? should we destroy the packet like above? */
 		}
 	}
@@ -1512,12 +1458,12 @@ trim_history:
 	num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
 
 	if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
-		list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+		list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
+					 dccphrx_node) {
 			if (num_later == 0) {
-				list_del_init(&entry->ccid3hrx_node);
-				ccid3_rx_hist_entry_delete(entry);
-			} else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-				   entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+				list_del_init(&entry->dccphrx_node);
+				dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
+			} else if (dccp_rx_hist_entry_data_packet(entry))
 				--num_later;
 		}
 	} else {
@@ -1528,7 +1474,8 @@ trim_history:
 		 * We have no loss interval history so we need at least one
 		 * rtt:s of data packets to approximate rtt.
 		 */
-		list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+		list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
+					 dccphrx_node) {
 			if (num_later == 0) {
 				switch (step) {
 				case 0:
@@ -1540,10 +1487,11 @@ trim_history:
 					step = 2;
 					/* OK, find next data packet */
 					num_later = 1;
-					win_count = entry->ccid3hrx_win_count;
+					win_count = entry->dccphrx_win_count;
 					break;
 				case 2:
-					tmp = win_count - entry->ccid3hrx_win_count;
+					tmp = (win_count -
+					       entry->dccphrx_win_count);
 					if (tmp < 0)
 						tmp += TFRC_WIN_COUNT_LIMIT;
 					if (tmp > TFRC_WIN_COUNT_PER_RTT + 1) {
@@ -1554,12 +1502,11 @@ trim_history:
 						num_later = 1;
 					break;
 				case 3:
-					list_del_init(&entry->ccid3hrx_node);
-					ccid3_rx_hist_entry_delete(entry);
+					list_del_init(&entry->dccphrx_node);
+					dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
 					break;
 				}
-			} else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-				   entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+			} else if (dccp_rx_hist_entry_data_packet(entry))
 				--num_later;
 		}
 	}
@@ -1571,7 +1518,7 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
-	struct ccid3_rx_hist_entry *entry, *packet;
+	struct dccp_rx_hist_entry *packet;
 
 	ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
 
@@ -1594,14 +1541,7 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 		return;
 	}
 
-	packet = NULL;
-	list_for_each_entry(entry, &hcrx->ccid3hcrx_hist, ccid3hrx_node)
-		if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-		    entry->ccid3hrx_type == DCCP_PKT_DATAACK) {
-			packet = entry;
-			break;
-		}
-
+	packet = dccp_rx_hist_find_data_packet(&hcrx->ccid3hcrx_hist);
 	if (packet == NULL) {
 		printk(KERN_CRIT "%s: %s, sk=%p, no data packet in history!\n",
 		       __FUNCTION__, dccp_role(sk), sk);
@@ -1610,12 +1550,12 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 	}
 
 	do_gettimeofday(&(hcrx->ccid3hcrx_tstamp_last_feedback));
-	hcrx->ccid3hcrx_last_counter	     = packet->ccid3hrx_win_count;
-	hcrx->ccid3hcrx_seqno_last_counter   = packet->ccid3hrx_seqno;
+	hcrx->ccid3hcrx_last_counter	     = packet->dccphrx_win_count;
+	hcrx->ccid3hcrx_seqno_last_counter   = packet->dccphrx_seqno;
 	hcrx->ccid3hcrx_bytes_recv	     = 0;
 
 	/* Convert to multiples of 10us */
-	hcrx->ccid3hcrx_elapsed_time = now_delta(packet->ccid3hrx_tstamp) / 10;
+	hcrx->ccid3hcrx_elapsed_time = now_delta(packet->dccphrx_tstamp) / 10;
 	if (hcrx->ccid3hcrx_p == 0)
 		hcrx->ccid3hcrx_pinv = ~0;
 	else
@@ -1686,7 +1626,7 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
-	struct ccid3_rx_hist_entry *entry, *next, *tail = NULL;
+	struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
 	u32 rtt, delta, x_recv, fval, p, tmp2;
 	struct timeval tstamp, tmp_tv;
 	int interval = 0;
@@ -1694,19 +1634,19 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 	int step = 0;
 	u64 tmp1;
 
-	list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
-		if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-		    entry->ccid3hrx_type == DCCP_PKT_DATAACK) {
+	list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
+				 dccphrx_node) {
+		if (dccp_rx_hist_entry_data_packet(entry)) {
 			tail = entry;
 
 			switch (step) {
 			case 0:
-				tstamp	  = entry->ccid3hrx_tstamp;
-				win_count = entry->ccid3hrx_win_count;
+				tstamp	  = entry->dccphrx_tstamp;
+				win_count = entry->dccphrx_win_count;
 				step = 1;
 				break;
 			case 1:
-				interval = win_count - entry->ccid3hrx_win_count;
+				interval = win_count - entry->dccphrx_win_count;
 				if (interval < 0)
 					interval += TFRC_WIN_COUNT_LIMIT;
 				if (interval > 4)
@@ -1728,7 +1668,7 @@ static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
 		interval = 1;
 	}
 found:
-	timeval_sub(tstamp,tail->ccid3hrx_tstamp,&tmp_tv);
+	timeval_sub(tstamp,tail->dccphrx_tstamp,&tmp_tv);
 	rtt = (tmp_tv.tv_sec * USEC_IN_SEC + tmp_tv.tv_usec) * 4 / interval;
 	ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
 		       dccp_role(sk), sk, rtt);
@@ -1797,34 +1737,33 @@ static void ccid3_hc_rx_detect_loss(struct sock *sk)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
-	struct ccid3_rx_hist_entry *entry, *a_next, *b_next, *packet;
-	struct ccid3_rx_hist_entry *a_loss = NULL;
-	struct ccid3_rx_hist_entry *b_loss = NULL;
+	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 win_loss = 0;
 	u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
 
-	list_for_each_entry_safe(entry, b_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+	list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
+				 dccphrx_node) {
 		if (num_later == 0) {
 			b_loss = entry;
 			break;
-		} else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-			   entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+		} else if (dccp_rx_hist_entry_data_packet(entry))
 			--num_later;
 	}
 
 	if (b_loss == NULL)
 		goto out_update_li;
 
-	a_next = b_next;
 	num_later = 1;
 
-	list_for_each_entry_safe_continue(entry, a_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
+	list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
+					  dccphrx_node) {
 		if (num_later == 0) {
 			a_loss = entry;
 			break;
-		} else if (entry->ccid3hrx_type == DCCP_PKT_DATA ||
-			   entry->ccid3hrx_type == DCCP_PKT_DATAACK)
+		} else if (dccp_rx_hist_entry_data_packet(entry))
 			--num_later;
 	}
 
@@ -1844,12 +1783,13 @@ static void ccid3_hc_rx_detect_loss(struct sock *sk)
 
 	/* Locate a lost data packet */
 	entry = packet = b_loss;
-	list_for_each_entry_safe_continue(entry, b_next, &hcrx->ccid3hcrx_hist, ccid3hrx_node) {
-		u64 delta = dccp_delta_seqno(entry->ccid3hrx_seqno, packet->ccid3hrx_seqno);
+	list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
+					  dccphrx_node) {
+		u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
+					     packet->dccphrx_seqno);
 
 		if (delta != 0) {
-			if (packet->ccid3hrx_type == DCCP_PKT_DATA ||
-			    packet->ccid3hrx_type == DCCP_PKT_DATAACK)
+			if (dccp_rx_hist_entry_data_packet(packet))
 				--delta;
 			/*
 			 * FIXME: check this, probably this % usage is because
@@ -1858,10 +1798,12 @@ static void ccid3_hc_rx_detect_loss(struct sock *sk)
 			 */
 #if 0
 			if (delta % DCCP_NDP_LIMIT !=
-			    (packet->ccid3hrx_ndp - entry->ccid3hrx_ndp) % DCCP_NDP_LIMIT)
+			    (packet->dccphrx_ndp -
+			     entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
 #endif
-			if (delta != packet->ccid3hrx_ndp - entry->ccid3hrx_ndp) {
-				seq_loss = entry->ccid3hrx_seqno;
+			if (delta !=
+			     packet->dccphrx_ndp - entry->dccphrx_ndp) {
+				seq_loss = entry->dccphrx_seqno;
 				dccp_inc_seqno(&seq_loss);
 			}
 		}
@@ -1871,7 +1813,7 @@ static void ccid3_hc_rx_detect_loss(struct sock *sk)
 	}
 
 	if (seq_loss != DCCP_MAX_SEQNO + 1)
-		win_loss = a_loss->ccid3hrx_win_count;
+		win_loss = a_loss->dccphrx_win_count;
 
 out_update_li:
 	ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
@@ -1920,7 +1862,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
 	struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
-	struct ccid3_rx_hist_entry *packet;
+	struct dccp_rx_hist_entry *packet;
 	struct timeval now;
 	u8 win_count;
 	u32 p_prev;
@@ -1964,14 +1906,16 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 		return;
 	}
 
-	packet = ccid3_rx_hist_entry_new(sk, skb, SLAB_ATOMIC);
+	packet = dccp_rx_hist_entry_new(ccid3_rx_hist,
+					dp->dccps_options_received.dccpor_ndp,
+					skb, SLAB_ATOMIC);
 	if (packet == NULL) {
 		ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet to history (consider it lost)!",
 			       dccp_role(sk), sk);
 		return;
 	}
 
-	win_count = packet->ccid3hrx_win_count;
+	win_count = packet->dccphrx_win_count;
 
 	ins = ccid3_hc_rx_add_hist(sk, packet);
 
@@ -2060,7 +2004,7 @@ static void ccid3_hc_rx_exit(struct sock *sk)
 	ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
 
 	/* Empty packet history */
-	ccid3_rx_history_delete(&hcrx->ccid3hcrx_hist);
+	dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
 
 	/* Empty loss interval history */
 	ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
@@ -2093,41 +2037,38 @@ MODULE_PARM_DESC(ccid3_debug, "Enable debug messages");
 
 static __init int ccid3_module_init(void)
 {
-	int rc = -ENOMEM;
+	int rc = -ENOBUFS;
 
-	ccid3_tx_hist_slab = kmem_cache_create("dccp_ccid3_tx_history",
-					       sizeof(struct ccid3_tx_hist_entry), 0,
-					       SLAB_HWCACHE_ALIGN, NULL, NULL);
-	if (ccid3_tx_hist_slab == NULL)
+	ccid3_rx_hist = dccp_rx_hist_new("ccid3");
+	if (ccid3_rx_hist == NULL)
 		goto out;
 
-	ccid3_rx_hist_slab = kmem_cache_create("dccp_ccid3_rx_history",
-					       sizeof(struct ccid3_rx_hist_entry), 0,
-					       SLAB_HWCACHE_ALIGN, NULL, NULL);
-	if (ccid3_rx_hist_slab == NULL)
-		goto out_free_tx_history;
+	ccid3_tx_hist = dccp_tx_hist_new("ccid3");
+	if (ccid3_tx_hist == NULL)
+		goto out_free_rx;
 
-	ccid3_loss_interval_hist_slab = kmem_cache_create("dccp_ccid3_loss_interval_history",
-							  sizeof(struct ccid3_loss_interval_hist_entry), 0,
-							  SLAB_HWCACHE_ALIGN, NULL, NULL);
+	ccid3_loss_interval_hist_slab = kmem_cache_create("li_hist_ccid3",
+				  sizeof(struct ccid3_loss_interval_hist_entry),
+							  0, SLAB_HWCACHE_ALIGN,
+							  NULL, NULL);
 	if (ccid3_loss_interval_hist_slab == NULL)
-		goto out_free_rx_history;
+		goto out_free_tx;
 
 	rc = ccid_register(&ccid3);
 	if (rc != 0) 
 		goto out_free_loss_interval_history;
-
 out:
 	return rc;
+
 out_free_loss_interval_history:
 	kmem_cache_destroy(ccid3_loss_interval_hist_slab);
 	ccid3_loss_interval_hist_slab = NULL;
-out_free_rx_history:
-	kmem_cache_destroy(ccid3_rx_hist_slab);
-	ccid3_rx_hist_slab = NULL;
-out_free_tx_history:
-	kmem_cache_destroy(ccid3_tx_hist_slab);
-	ccid3_tx_hist_slab = NULL;
+out_free_tx:
+	dccp_tx_hist_delete(ccid3_tx_hist);
+	ccid3_tx_hist = NULL;
+out_free_rx:
+	dccp_rx_hist_delete(ccid3_rx_hist);
+	ccid3_rx_hist = NULL;
 	goto out;
 }
 module_init(ccid3_module_init);
@@ -2136,13 +2077,13 @@ static __exit void ccid3_module_exit(void)
 {
 	ccid_unregister(&ccid3);
 
-	if (ccid3_tx_hist_slab != NULL) {
-		kmem_cache_destroy(ccid3_tx_hist_slab);
-		ccid3_tx_hist_slab = NULL;
+	if (ccid3_tx_hist != NULL) {
+		dccp_tx_hist_delete(ccid3_tx_hist);
+		ccid3_tx_hist = NULL;
 	}
-	if (ccid3_rx_hist_slab != NULL) {
-		kmem_cache_destroy(ccid3_rx_hist_slab);
-		ccid3_rx_hist_slab = NULL;
+	if (ccid3_rx_hist != NULL) {
+		dccp_rx_hist_delete(ccid3_rx_hist);
+		ccid3_rx_hist = NULL;
 	}
 	if (ccid3_loss_interval_hist_slab != NULL) {
 		kmem_cache_destroy(ccid3_loss_interval_hist_slab);
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 5d6b623..d2705fb 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -38,15 +38,6 @@
 
 #include <linux/types.h>
 #include <linux/list.h>
-#include <linux/timer.h>
-
-struct ccid3_tx_hist_entry {
-	struct list_head	ccid3htx_node;
-	u64			ccid3htx_seqno:48,
-				ccid3htx_win_count:8,
-				ccid3htx_sent:1;
-	struct timeval		ccid3htx_tstamp;
-};
 
 struct ccid3_options_received {
 	u64 ccid3or_seqno:48,
@@ -102,15 +93,6 @@ struct ccid3_loss_interval_hist_entry {
 	u32			ccid3lih_interval;
 };
 
-struct ccid3_rx_hist_entry {
-	struct list_head	ccid3hrx_node;
-	u64			ccid3hrx_seqno:48,
-				ccid3hrx_win_count:4,
-				ccid3hrx_type:4;
-	u32			ccid3hrx_ndp; /* In fact it is from 8 to 24 bits */
-	struct timeval		ccid3hrx_tstamp;
-};
-
 struct ccid3_hc_rx_sock {
   	u64			ccid3hcrx_seqno_last_counter:48,
 				ccid3hcrx_state:8,