Merge branch 'tipc-next'

Jon Maloy says:

====================
tipc: some link layer improvements

We continue eliminating redundant complexity at the link layer, and
add a couple of improvements to the packet sending functionality.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/addr.c

@@ -38,13 +38,6 @@
 #include "addr.h"
 #include "core.h"
 
-u32 tipc_own_addr(struct net *net)
-{
-	struct tipc_net *tn = net_generic(net, tipc_net_id);
-
-	return tn->own_addr;
-}
-
 /**
  * in_own_cluster - test for cluster inclusion; <0.0.0> always matches
  */

net/tipc/addr.h

@@ -41,10 +41,18 @@
 #include <linux/tipc.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
+#include "core.h"
 
 #define TIPC_ZONE_MASK		0xff000000u
 #define TIPC_CLUSTER_MASK	0xfffff000u
 
+static inline u32 tipc_own_addr(struct net *net)
+{
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+	return tn->own_addr;
+}
+
 static inline u32 tipc_zone_mask(u32 addr)
 {
 	return addr & TIPC_ZONE_MASK;

net/tipc/bcast.c

@@ -115,19 +115,15 @@ static void bclink_set_last_sent(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_link *bcl = tn->bcl;
-	struct sk_buff *skb = skb_peek(&bcl->backlogq);
 
-	if (skb)
-		bcl->fsm_msg_cnt = mod(buf_seqno(skb) - 1);
-	else
-		bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1);
+	bcl->silent_intv_cnt = mod(bcl->snd_nxt - 1);
 }
 
 u32 tipc_bclink_get_last_sent(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-	return tn->bcl->fsm_msg_cnt;
+	return tn->bcl->silent_intv_cnt;
 }
 
 static void bclink_update_last_sent(struct tipc_node *node, u32 seqno)
@@ -212,16 +208,16 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 		 * or both sent and unsent messages (otherwise)
 		 */
 		if (tn->bclink->bcast_nodes.count)
-			acked = tn->bcl->fsm_msg_cnt;
+			acked = tn->bcl->silent_intv_cnt;
 		else
-			acked = tn->bcl->next_out_no;
+			acked = tn->bcl->snd_nxt;
 	} else {
 		/*
 		 * Bail out if specified sequence number does not correspond
 		 * to a message that has been sent and not yet acknowledged
 		 */
 		if (less(acked, buf_seqno(skb)) ||
-		    less(tn->bcl->fsm_msg_cnt, acked) ||
+		    less(tn->bcl->silent_intv_cnt, acked) ||
 		    less_eq(acked, n_ptr->bclink.acked))
 			goto exit;
 	}
@@ -803,9 +799,9 @@ int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
 		goto attr_msg_full;
 	if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
 		goto attr_msg_full;
-	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->next_in_no))
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt))
 		goto attr_msg_full;
-	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->next_out_no))
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt))
 		goto attr_msg_full;
 
 	prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
@@ -914,7 +910,7 @@ int tipc_bclink_init(struct net *net)
 	__skb_queue_head_init(&bcl->backlogq);
 	__skb_queue_head_init(&bcl->deferdq);
 	skb_queue_head_init(&bcl->wakeupq);
-	bcl->next_out_no = 1;
+	bcl->snd_nxt = 1;
 	spin_lock_init(&bclink->node.lock);
 	__skb_queue_head_init(&bclink->arrvq);
 	skb_queue_head_init(&bclink->inputq);

net/tipc/bearer.c

@@ -71,8 +71,7 @@ static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
 	[TIPC_NLA_MEDIA_PROP]		= { .type = NLA_NESTED }
 };
 
-static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
-			   bool shutting_down);
+static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr);
 
 /**
  * tipc_media_find - locates specified media object by name
@@ -324,7 +323,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
 
 	res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
 	if (res) {
-		bearer_disable(net, b_ptr, false);
+		bearer_disable(net, b_ptr);
 		pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
 			name);
 		return -EINVAL;
@@ -344,7 +343,7 @@ static int tipc_enable_bearer(struct net *net, const char *name,
 static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
 {
 	pr_info("Resetting bearer <%s>\n", b_ptr->name);
-	tipc_link_reset_list(net, b_ptr->identity);
+	tipc_link_delete_list(net, b_ptr->identity);
 	tipc_disc_reset(net, b_ptr);
 	return 0;
 }
@@ -354,8 +353,7 @@ static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b_ptr)
  *
  * Note: This routine assumes caller holds RTNL lock.
  */
-static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
-			   bool shutting_down)
+static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	u32 i;
@@ -363,7 +361,7 @@ static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
 	pr_info("Disabling bearer <%s>\n", b_ptr->name);
 	b_ptr->media->disable_media(b_ptr);
 
-	tipc_link_delete_list(net, b_ptr->identity, shutting_down);
+	tipc_link_delete_list(net, b_ptr->identity);
 	if (b_ptr->link_req)
 		tipc_disc_delete(b_ptr->link_req);
 
@@ -541,7 +539,7 @@ static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
 		break;
 	case NETDEV_UNREGISTER:
 	case NETDEV_CHANGENAME:
-		bearer_disable(dev_net(dev), b_ptr, false);
+		bearer_disable(dev_net(dev), b_ptr);
 		break;
 	}
 	return NOTIFY_OK;
@@ -583,7 +581,7 @@ void tipc_bearer_stop(struct net *net)
 	for (i = 0; i < MAX_BEARERS; i++) {
 		b_ptr = rtnl_dereference(tn->bearer_list[i]);
 		if (b_ptr) {
-			bearer_disable(net, b_ptr, true);
+			bearer_disable(net, b_ptr);
 			tn->bearer_list[i] = NULL;
 		}
 	}
@@ -747,7 +745,7 @@ int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 	}
 
-	bearer_disable(net, bearer, false);
+	bearer_disable(net, bearer);
 	rtnl_unlock();
 
 	return 0;

net/tipc/bearer.h

@@ -38,9 +38,9 @@
 #define _TIPC_BEARER_H
 
 #include "netlink.h"
+#include "core.h"
 #include <net/genetlink.h>
 
-#define MAX_BEARERS	2
 #define MAX_MEDIA	3
 #define MAX_NODES	4096
 #define WSIZE		32

net/tipc/core.h

@@ -60,16 +60,19 @@
 #include <net/netns/generic.h>
 #include <linux/rhashtable.h>
 
-#include "node.h"
-#include "bearer.h"
-#include "bcast.h"
-#include "netlink.h"
-#include "link.h"
-#include "node.h"
-#include "msg.h"
+struct tipc_node;
+struct tipc_bearer;
+struct tipc_bcbearer;
+struct tipc_bclink;
+struct tipc_link;
+struct tipc_name_table;
+struct tipc_server;
 
 #define TIPC_MOD_VER "2.0.0"
 
+#define NODE_HTABLE_SIZE   512
+#define MAX_BEARERS	   3
+
 extern int tipc_net_id __read_mostly;
 extern int sysctl_tipc_rmem[3] __read_mostly;
 extern int sysctl_tipc_named_timeout __read_mostly;
@@ -106,6 +109,26 @@ struct tipc_net {
 	atomic_t subscription_count;
 };
 
+static inline u16 mod(u16 x)
+{
+	return x & 0xffffu;
+}
+
+static inline int less_eq(u16 left, u16 right)
+{
+	return mod(right - left) < 32768u;
+}
+
+static inline int more(u16 left, u16 right)
+{
+	return !less_eq(left, right);
+}
+
+static inline int less(u16 left, u16 right)
+{
+	return less_eq(left, right) && (mod(right) != mod(left));
+}
+
 #ifdef CONFIG_SYSCTL
 int tipc_register_sysctl(void);
 void tipc_unregister_sysctl(void);

net/tipc/link.c

@@ -86,7 +86,7 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
  */
 #define  STARTING_EVT    856384768	/* link processing trigger */
 #define  TRAFFIC_MSG_EVT 560815u	/* rx'd ??? */
-#define  TIMEOUT_EVT     560817u	/* link timer expired */
+#define  SILENCE_EVT     560817u	/* timer dicovered silence from peer */
 
 /*
  * State value stored in 'failover_pkts'
@@ -106,6 +106,7 @@ static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
 static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
 static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
 static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
+static void link_set_timer(struct tipc_link *link, unsigned long time);
 /*
  *  Simple link routines
  */
@@ -197,11 +198,12 @@ static void link_timeout(unsigned long data)
 	}
 
 	/* do all other link processing performed on a periodic basis */
-	link_state_event(l_ptr, TIMEOUT_EVT);
-
+	if (l_ptr->silent_intv_cnt || tipc_bclink_acks_missing(l_ptr->owner))
+		link_state_event(l_ptr, SILENCE_EVT);
+	l_ptr->silent_intv_cnt++;
 	if (skb_queue_len(&l_ptr->backlogq))
 		tipc_link_push_packets(l_ptr);
-
+	link_set_timer(l_ptr, l_ptr->keepalive_intv);
 	tipc_node_unlock(l_ptr->owner);
 	tipc_link_put(l_ptr);
 }
@@ -233,8 +235,8 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 
 	if (n_ptr->link_cnt >= MAX_BEARERS) {
 		tipc_addr_string_fill(addr_string, n_ptr->addr);
-		pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n",
-			n_ptr->link_cnt, addr_string, MAX_BEARERS);
+		pr_err("Cannot establish %uth link to %s. Max %u allowed.\n",
+		       n_ptr->link_cnt, addr_string, MAX_BEARERS);
 		return NULL;
 	}
 
@@ -261,7 +263,6 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 		/* note: peer i/f name is updated by reset/activate message */
 	memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
 	l_ptr->owner = n_ptr;
-	l_ptr->checkpoint = 1;
 	l_ptr->peer_session = INVALID_SESSION;
 	l_ptr->bearer_id = b_ptr->identity;
 	link_set_supervision_props(l_ptr, b_ptr->tolerance);
@@ -280,7 +281,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 	l_ptr->mtu = l_ptr->advertised_mtu;
 	l_ptr->priority = b_ptr->priority;
 	tipc_link_set_queue_limits(l_ptr, b_ptr->window);
-	l_ptr->next_out_no = 1;
+	l_ptr->snd_nxt = 1;
 	__skb_queue_head_init(&l_ptr->transmq);
 	__skb_queue_head_init(&l_ptr->backlogq);
 	__skb_queue_head_init(&l_ptr->deferdq);
@@ -311,8 +312,7 @@ void tipc_link_delete(struct tipc_link *l)
 	tipc_link_put(l);
 }
 
-void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
-			   bool shutting_down)
+void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_link *link;
@@ -451,9 +451,9 @@ void tipc_link_reset(struct tipc_link *l_ptr)
 
 	if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
 		l_ptr->flags |= LINK_FAILINGOVER;
-		l_ptr->failover_checkpt = l_ptr->next_in_no;
+		l_ptr->failover_checkpt = l_ptr->rcv_nxt;
 		pl->failover_pkts = FIRST_FAILOVER;
-		pl->failover_checkpt = l_ptr->next_in_no;
+		pl->failover_checkpt = l_ptr->rcv_nxt;
 		pl->failover_skb = l_ptr->reasm_buf;
 	} else {
 		kfree_skb(l_ptr->reasm_buf);
@@ -469,36 +469,19 @@ void tipc_link_reset(struct tipc_link *l_ptr)
 	tipc_link_purge_backlog(l_ptr);
 	l_ptr->reasm_buf = NULL;
 	l_ptr->rcv_unacked = 0;
-	l_ptr->checkpoint = 1;
-	l_ptr->next_out_no = 1;
-	l_ptr->fsm_msg_cnt = 0;
+	l_ptr->snd_nxt = 1;
+	l_ptr->silent_intv_cnt = 0;
 	l_ptr->stale_count = 0;
 	link_reset_statistics(l_ptr);
 }
 
-void tipc_link_reset_list(struct net *net, unsigned int bearer_id)
-{
-	struct tipc_net *tn = net_generic(net, tipc_net_id);
-	struct tipc_link *l_ptr;
-	struct tipc_node *n_ptr;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
-		tipc_node_lock(n_ptr);
-		l_ptr = n_ptr->links[bearer_id];
-		if (l_ptr)
-			tipc_link_reset(l_ptr);
-		tipc_node_unlock(n_ptr);
-	}
-	rcu_read_unlock();
-}
-
 static void link_activate(struct tipc_link *link)
 {
 	struct tipc_node *node = link->owner;
 
-	link->next_in_no = 1;
+	link->rcv_nxt = 1;
 	link->stats.recv_info = 1;
+	link->silent_intv_cnt = 0;
 	tipc_node_link_up(node, link);
 	tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
 }
@@ -511,7 +494,7 @@ static void link_activate(struct tipc_link *link)
 static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
 {
 	struct tipc_link *other;
-	unsigned long cont_intv = l_ptr->cont_intv;
+	unsigned long timer_intv = l_ptr->keepalive_intv;
 
 	if (l_ptr->flags & LINK_STOPPED)
 		return;
@@ -519,45 +502,33 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
 	if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
 		return;		/* Not yet. */
 
-	if (l_ptr->flags & LINK_FAILINGOVER) {
-		if (event == TIMEOUT_EVT)
-			link_set_timer(l_ptr, cont_intv);
+	if (l_ptr->flags & LINK_FAILINGOVER)
 		return;
-	}
 
 	switch (l_ptr->state) {
 	case WORKING_WORKING:
 		switch (event) {
 		case TRAFFIC_MSG_EVT:
 		case ACTIVATE_MSG:
+			l_ptr->silent_intv_cnt = 0;
 			break;
-		case TIMEOUT_EVT:
-			if (l_ptr->next_in_no != l_ptr->checkpoint) {
-				l_ptr->checkpoint = l_ptr->next_in_no;
-				if (tipc_bclink_acks_missing(l_ptr->owner)) {
+		case SILENCE_EVT:
+			if (!l_ptr->silent_intv_cnt) {
+				if (tipc_bclink_acks_missing(l_ptr->owner))
 					tipc_link_proto_xmit(l_ptr, STATE_MSG,
 							     0, 0, 0, 0);
-					l_ptr->fsm_msg_cnt++;
-				}
-				link_set_timer(l_ptr, cont_intv);
 				break;
 			}
 			l_ptr->state = WORKING_UNKNOWN;
-			l_ptr->fsm_msg_cnt = 0;
 			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv / 4);
 			break;
 		case RESET_MSG:
 			pr_debug("%s<%s>, requested by peer\n",
 				 link_rst_msg, l_ptr->name);
 			tipc_link_reset(l_ptr);
 			l_ptr->state = RESET_RESET;
-			l_ptr->fsm_msg_cnt = 0;
 			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
 					     0, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		default:
 			pr_debug("%s%u in WW state\n", link_unk_evt, event);
@@ -568,46 +539,33 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
 		case TRAFFIC_MSG_EVT:
 		case ACTIVATE_MSG:
 			l_ptr->state = WORKING_WORKING;
-			l_ptr->fsm_msg_cnt = 0;
-			link_set_timer(l_ptr, cont_intv);
+			l_ptr->silent_intv_cnt = 0;
 			break;
 		case RESET_MSG:
 			pr_debug("%s<%s>, requested by peer while probing\n",
 				 link_rst_msg, l_ptr->name);
 			tipc_link_reset(l_ptr);
 			l_ptr->state = RESET_RESET;
-			l_ptr->fsm_msg_cnt = 0;
 			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
 					     0, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
 			break;
-		case TIMEOUT_EVT:
-			if (l_ptr->next_in_no != l_ptr->checkpoint) {
+		case SILENCE_EVT:
+			if (!l_ptr->silent_intv_cnt) {
 				l_ptr->state = WORKING_WORKING;
-				l_ptr->fsm_msg_cnt = 0;
-				l_ptr->checkpoint = l_ptr->next_in_no;
-				if (tipc_bclink_acks_missing(l_ptr->owner)) {
+				if (tipc_bclink_acks_missing(l_ptr->owner))
 					tipc_link_proto_xmit(l_ptr, STATE_MSG,
 							     0, 0, 0, 0);
-					l_ptr->fsm_msg_cnt++;
-				}
-				link_set_timer(l_ptr, cont_intv);
-			} else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
+			} else if (l_ptr->silent_intv_cnt <
+				   l_ptr->abort_limit) {
 				tipc_link_proto_xmit(l_ptr, STATE_MSG,
 						     1, 0, 0, 0);
-				l_ptr->fsm_msg_cnt++;
-				link_set_timer(l_ptr, cont_intv / 4);
 			} else {	/* Link has failed */
 				pr_debug("%s<%s>, peer not responding\n",
 					 link_rst_msg, l_ptr->name);
 				tipc_link_reset(l_ptr);
 				l_ptr->state = RESET_UNKNOWN;
-				l_ptr->fsm_msg_cnt = 0;
 				tipc_link_proto_xmit(l_ptr, RESET_MSG,
 						     0, 0, 0, 0);
-				l_ptr->fsm_msg_cnt++;
-				link_set_timer(l_ptr, cont_intv);
 			}
 			break;
 		default:
@@ -623,31 +581,22 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
 			if (other && link_working_unknown(other))
 				break;
 			l_ptr->state = WORKING_WORKING;
-			l_ptr->fsm_msg_cnt = 0;
 			link_activate(l_ptr);
 			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
 			if (l_ptr->owner->working_links == 1)
 				tipc_link_sync_xmit(l_ptr);
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		case RESET_MSG:
 			l_ptr->state = RESET_RESET;
-			l_ptr->fsm_msg_cnt = 0;
 			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
 					     1, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		case STARTING_EVT:
 			l_ptr->flags |= LINK_STARTED;
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
+			link_set_timer(l_ptr, timer_intv);
 			break;
-		case TIMEOUT_EVT:
+		case SILENCE_EVT:
 			tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		default:
 			pr_err("%s%u in RU state\n", link_unk_evt, event);
@@ -661,21 +610,16 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
 			if (other && link_working_unknown(other))
 				break;
 			l_ptr->state = WORKING_WORKING;
-			l_ptr->fsm_msg_cnt = 0;
 			link_activate(l_ptr);
 			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
 			if (l_ptr->owner->working_links == 1)
 				tipc_link_sync_xmit(l_ptr);
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		case RESET_MSG:
 			break;
-		case TIMEOUT_EVT:
+		case SILENCE_EVT:
 			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
 					     0, 0, 0, 0);
-			l_ptr->fsm_msg_cnt++;
-			link_set_timer(l_ptr, cont_intv);
 			break;
 		default:
 			pr_err("%s%u in RR state\n", link_unk_evt, event);
@@ -701,53 +645,58 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link,
 {
 	struct tipc_msg *msg = buf_msg(skb_peek(list));
 	unsigned int maxwin = link->window;
-	unsigned int imp = msg_importance(msg);
+	unsigned int i, imp = msg_importance(msg);
 	uint mtu = link->mtu;
-	uint ack = mod(link->next_in_no - 1);
-	uint seqno = link->next_out_no;
-	uint bc_last_in = link->owner->bclink.last_in;
+	u16 ack = mod(link->rcv_nxt - 1);
+	u16 seqno = link->snd_nxt;
+	u16 bc_last_in = link->owner->bclink.last_in;
 	struct tipc_media_addr *addr = &link->media_addr;
 	struct sk_buff_head *transmq = &link->transmq;
 	struct sk_buff_head *backlogq = &link->backlogq;
-	struct sk_buff *skb, *tmp;
-
-	/* Match backlog limit against msg importance: */
-	if (unlikely(link->backlog[imp].len >= link->backlog[imp].limit))
-		return link_schedule_user(link, list);
+	struct sk_buff *skb, *bskb;
 
+	/* Match msg importance against this and all higher backlog limits: */
+	for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
+		if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
+			return link_schedule_user(link, list);
+	}
 	if (unlikely(msg_size(msg) > mtu)) {
 		__skb_queue_purge(list);
 		return -EMSGSIZE;
 	}
 	/* Prepare each packet for sending, and add to relevant queue: */
-	skb_queue_walk_safe(list, skb, tmp) {
-		__skb_unlink(skb, list);
+	while (skb_queue_len(list)) {
+		skb = skb_peek(list);
 		msg = buf_msg(skb);
 		msg_set_seqno(msg, seqno);
 		msg_set_ack(msg, ack);
 		msg_set_bcast_ack(msg, bc_last_in);
 
 		if (likely(skb_queue_len(transmq) < maxwin)) {
+			__skb_dequeue(list);
 			__skb_queue_tail(transmq, skb);
 			tipc_bearer_send(net, link->bearer_id, skb, addr);
 			link->rcv_unacked = 0;
 			seqno++;
 			continue;
 		}
-		if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) {
+		if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) {
+			kfree_skb(__skb_dequeue(list));
 			link->stats.sent_bundled++;
 			continue;
 		}
-		if (tipc_msg_make_bundle(&skb, mtu, link->addr)) {
+		if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) {
+			kfree_skb(__skb_dequeue(list));
+			__skb_queue_tail(backlogq, bskb);
+			link->backlog[msg_importance(buf_msg(bskb))].len++;
 			link->stats.sent_bundled++;
 			link->stats.sent_bundles++;
-			imp = msg_importance(buf_msg(skb));
+			continue;
 		}
-		__skb_queue_tail(backlogq, skb);
-		link->backlog[imp].len++;
-		seqno++;
+		link->backlog[imp].len += skb_queue_len(list);
+		skb_queue_splice_tail_init(list, backlogq);
 	}
-	link->next_out_no = seqno;
+	link->snd_nxt = seqno;
 	return 0;
 }
 
@@ -877,7 +826,8 @@ void tipc_link_push_packets(struct tipc_link *link)
 {
 	struct sk_buff *skb;
 	struct tipc_msg *msg;
-	unsigned int ack = mod(link->next_in_no - 1);
+	u16 seqno = link->snd_nxt;
+	u16 ack = mod(link->rcv_nxt - 1);
 
 	while (skb_queue_len(&link->transmq) < link->window) {
 		skb = __skb_dequeue(&link->backlogq);
@@ -886,12 +836,15 @@ void tipc_link_push_packets(struct tipc_link *link)
 		msg = buf_msg(skb);
 		link->backlog[msg_importance(msg)].len--;
 		msg_set_ack(msg, ack);
+		msg_set_seqno(msg, seqno);
+		seqno = mod(seqno + 1);
 		msg_set_bcast_ack(msg, link->owner->bclink.last_in);
 		link->rcv_unacked = 0;
 		__skb_queue_tail(&link->transmq, skb);
 		tipc_bearer_send(link->owner->net, link->bearer_id,
 				 skb, &link->media_addr);
 	}
+	link->snd_nxt = seqno;
 }
 
 void tipc_link_reset_all(struct tipc_node *node)
@@ -964,13 +917,13 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
 	msg = buf_msg(skb);
 
 	/* Detect repeated retransmit failures */
-	if (l_ptr->last_retransmitted == msg_seqno(msg)) {
+	if (l_ptr->last_retransm == msg_seqno(msg)) {
 		if (++l_ptr->stale_count > 100) {
 			link_retransmit_failure(l_ptr, skb);
 			return;
 		}
 	} else {
-		l_ptr->last_retransmitted = msg_seqno(msg);
+		l_ptr->last_retransm = msg_seqno(msg);
 		l_ptr->stale_count = 1;
 	}
 
@@ -978,7 +931,7 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
 		if (!retransmits)
 			break;
 		msg = buf_msg(skb);
-		msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
+		msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
 		msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
 		tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
 				 &l_ptr->media_addr);
@@ -1001,11 +954,11 @@ static bool link_synch(struct tipc_link *l)
 		goto synched;
 
 	/* Was last pre-synch packet added to input queue ? */
-	if (less_eq(pl->next_in_no, l->synch_point))
+	if (less_eq(pl->rcv_nxt, l->synch_point))
 		return false;
 
 	/* Is it still in the input queue ? */
-	post_synch = mod(pl->next_in_no - l->synch_point) - 1;
+	post_synch = mod(pl->rcv_nxt - l->synch_point) - 1;
 	if (skb_queue_len(&pl->inputq) > post_synch)
 		return false;
 synched:
@@ -1016,13 +969,13 @@ static bool link_synch(struct tipc_link *l)
 static void link_retrieve_defq(struct tipc_link *link,
 			       struct sk_buff_head *list)
 {
-	u32 seq_no;
+	u16 seq_no;
 
 	if (skb_queue_empty(&link->deferdq))
 		return;
 
 	seq_no = buf_seqno(skb_peek(&link->deferdq));
-	if (seq_no == mod(link->next_in_no))
+	if (seq_no == link->rcv_nxt)
 		skb_queue_splice_tail_init(&link->deferdq, list);
 }
 
@@ -1043,8 +996,8 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
 	struct tipc_link *l_ptr;
 	struct sk_buff *skb1, *tmp;
 	struct tipc_msg *msg;
-	u32 seq_no;
-	u32 ackd;
+	u16 seq_no;
+	u16 ackd;
 	u32 released;
 
 	skb2list(skb, &head);
@@ -1137,18 +1090,20 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
 		}
 
 		/* Link is now in state WORKING_WORKING */
-		if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
+		if (unlikely(seq_no != l_ptr->rcv_nxt)) {
 			link_handle_out_of_seq_msg(l_ptr, skb);
 			link_retrieve_defq(l_ptr, &head);
 			skb = NULL;
 			goto unlock;
 		}
+		l_ptr->silent_intv_cnt = 0;
+
 		/* Synchronize with parallel link if applicable */
 		if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) {
 			if (!link_synch(l_ptr))
 				goto unlock;
 		}
-		l_ptr->next_in_no++;
+		l_ptr->rcv_nxt++;
 		if (unlikely(!skb_queue_empty(&l_ptr->deferdq)))
 			link_retrieve_defq(l_ptr, &head);
 		if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
@@ -1268,7 +1223,7 @@ static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
 u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
 {
 	struct sk_buff *skb1;
-	u32 seq_no = buf_seqno(skb);
+	u16 seq_no = buf_seqno(skb);
 
 	/* Empty queue ? */
 	if (skb_queue_empty(list)) {
@@ -1284,7 +1239,7 @@ u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
 
 	/* Locate insertion point in queue, then insert; discard if duplicate */
 	skb_queue_walk(list, skb1) {
-		u32 curr_seqno = buf_seqno(skb1);
+		u16 curr_seqno = buf_seqno(skb1);
 
 		if (seq_no == curr_seqno) {
 			kfree_skb(skb);
@@ -1312,14 +1267,14 @@ static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
 		return;
 	}
 
-	/* Record OOS packet arrival (force mismatch on next timeout) */
-	l_ptr->checkpoint--;
+	/* Record OOS packet arrival */
+	l_ptr->silent_intv_cnt = 0;
 
 	/*
 	 * Discard packet if a duplicate; otherwise add it to deferred queue
 	 * and notify peer of gap as per protocol specification
 	 */
-	if (less(seq_no, mod(l_ptr->next_in_no))) {
+	if (less(seq_no, l_ptr->rcv_nxt)) {
 		l_ptr->stats.duplicates++;
 		kfree_skb(buf);
 		return;
@@ -1344,6 +1299,7 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
 	struct tipc_msg *msg = l_ptr->pmsg;
 	u32 msg_size = sizeof(l_ptr->proto_msg);
 	int r_flag;
+	u16 last_rcv;
 
 	/* Don't send protocol message during link failover */
 	if (l_ptr->flags & LINK_FAILINGOVER)
@@ -1360,7 +1316,7 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
 	msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net));
 
 	if (msg_typ == STATE_MSG) {
-		u32 next_sent = mod(l_ptr->next_out_no);
+		u16 next_sent = l_ptr->snd_nxt;
 
 		if (!tipc_link_is_up(l_ptr))
 			return;
@@ -1368,8 +1324,8 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
 			next_sent = buf_seqno(skb_peek(&l_ptr->backlogq));
 		msg_set_next_sent(msg, next_sent);
 		if (!skb_queue_empty(&l_ptr->deferdq)) {
-			u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq));
-			gap = mod(rec - mod(l_ptr->next_in_no));
+			last_rcv = buf_seqno(skb_peek(&l_ptr->deferdq));
+			gap = mod(last_rcv - l_ptr->rcv_nxt);
 		}
 		msg_set_seq_gap(msg, gap);
 		if (gap)
@@ -1377,7 +1333,7 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
 		msg_set_link_tolerance(msg, tolerance);
 		msg_set_linkprio(msg, priority);
 		msg_set_max_pkt(msg, l_ptr->mtu);
-		msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
+		msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
 		msg_set_probe(msg, probe_msg != 0);
 		if (probe_msg)
 			l_ptr->stats.sent_probes++;
@@ -1397,7 +1353,7 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
 	msg_set_linkprio(msg, l_ptr->priority);
 	msg_set_size(msg, msg_size);
 
-	msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
+	msg_set_seqno(msg, mod(l_ptr->snd_nxt + (0xffff / 2)));
 
 	buf = tipc_buf_acquire(msg_size);
 	if (!buf)
@@ -1496,17 +1452,15 @@ static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
 		}
 
 		/* Record reception; force mismatch at next timeout: */
-		l_ptr->checkpoint--;
+		l_ptr->silent_intv_cnt = 0;
 
 		link_state_event(l_ptr, TRAFFIC_MSG_EVT);
 		l_ptr->stats.recv_states++;
 		if (link_reset_unknown(l_ptr))
 			break;
 
-		if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
-			rec_gap = mod(msg_next_sent(msg) -
-				      mod(l_ptr->next_in_no));
-		}
+		if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg)))
+			rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt);
 
 		if (msg_probe(msg))
 			l_ptr->stats.recv_probes++;
@@ -1580,6 +1534,11 @@ void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
 
 	tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL,
 		      FAILOVER_MSG, INT_H_SIZE, l_ptr->addr);
+
+	skb_queue_walk(&l_ptr->backlogq, skb) {
+		msg_set_seqno(buf_msg(skb), l_ptr->snd_nxt);
+		l_ptr->snd_nxt = mod(l_ptr->snd_nxt + 1);
+	}
 	skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq);
 	tipc_link_purge_backlog(l_ptr);
 	msgcount = skb_queue_len(&l_ptr->transmq);
@@ -1640,6 +1599,7 @@ void tipc_link_dup_queue_xmit(struct tipc_link *link,
 	struct tipc_msg tnl_hdr;
 	struct sk_buff_head *queue = &link->transmq;
 	int mcnt;
+	u16 seqno;
 
 	tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL,
 		      SYNCH_MSG, INT_H_SIZE, link->addr);
@@ -1653,7 +1613,7 @@ void tipc_link_dup_queue_xmit(struct tipc_link *link,
 		struct tipc_msg *msg = buf_msg(skb);
 		u32 len = msg_size(msg);
 
-		msg_set_ack(msg, mod(link->next_in_no - 1));
+		msg_set_ack(msg, mod(link->rcv_nxt - 1));
 		msg_set_bcast_ack(msg, link->owner->bclink.last_in);
 		msg_set_size(&tnl_hdr, len + INT_H_SIZE);
 		outskb = tipc_buf_acquire(len + INT_H_SIZE);
@@ -1671,6 +1631,11 @@ void tipc_link_dup_queue_xmit(struct tipc_link *link,
 	}
 	if (queue == &link->backlogq)
 		return;
+	seqno = link->snd_nxt;
+	skb_queue_walk(&link->backlogq, skb) {
+		msg_set_seqno(buf_msg(skb), seqno);
+		seqno = mod(seqno + 1);
+	}
 	queue = &link->backlogq;
 	goto tunnel_queue;
 }
@@ -1742,8 +1707,8 @@ static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
 		return;
 
 	l_ptr->tolerance = tol;
-	l_ptr->cont_intv = msecs_to_jiffies(intv);
-	l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4);
+	l_ptr->keepalive_intv = msecs_to_jiffies(intv);
+	l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv));
 }
 
 void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
@@ -1803,8 +1768,8 @@ static struct tipc_node *tipc_link_find_owner(struct net *net,
 static void link_reset_statistics(struct tipc_link *l_ptr)
 {
 	memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
-	l_ptr->stats.sent_info = l_ptr->next_out_no;
-	l_ptr->stats.recv_info = l_ptr->next_in_no;
+	l_ptr->stats.sent_info = l_ptr->snd_nxt;
+	l_ptr->stats.recv_info = l_ptr->rcv_nxt;
 }
 
 static void link_print(struct tipc_link *l_ptr, const char *str)
@@ -2037,9 +2002,9 @@ static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
 		goto attr_msg_full;
 	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
 		goto attr_msg_full;
-	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt))
 		goto attr_msg_full;
-	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no))
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
 		goto attr_msg_full;
 
 	if (tipc_link_is_up(link))

net/tipc/link.h

@@ -107,30 +107,29 @@ struct tipc_stats {
  * @owner: pointer to peer node
  * @refcnt: reference counter for permanent references (owner node & timer)
  * @flags: execution state flags for link endpoint instance
- * @checkpoint: reference point for triggering link continuity checking
  * @peer_session: link session # being used by peer end of link
  * @peer_bearer_id: bearer id used by link's peer endpoint
  * @bearer_id: local bearer id used by link
  * @tolerance: minimum link continuity loss needed to reset link [in ms]
- * @cont_intv: link continuity testing interval
+ * @keepalive_intv: link keepalive timer interval
  * @abort_limit: # of unacknowledged continuity probes needed to reset link
  * @state: current state of link FSM
- * @fsm_msg_cnt: # of protocol messages link FSM has sent in current state
+ * @silent_intv_cnt: # of timer intervals without any reception from peer
  * @proto_msg: template for control messages generated by link
  * @pmsg: convenience pointer to "proto_msg" field
  * @priority: current link priority
  * @net_plane: current link network plane ('A' through 'H')
  * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
  * @exp_msg_count: # of tunnelled messages expected during link changeover
- * @reset_checkpoint: seq # of last acknowledged message at time of link reset
+ * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
  * @mtu: current maximum packet size for this link
  * @advertised_mtu: advertised own mtu when link is being established
  * @transmitq: queue for sent, non-acked messages
  * @backlogq: queue for messages waiting to be sent
- * @next_out_no: next sequence number to use for outbound messages
+ * @snt_nxt: next sequence number to use for outbound messages
  * @last_retransmitted: sequence number of most recently retransmitted message
  * @stale_count: # of identical retransmit requests made by peer
- * @next_in_no: next sequence number to expect for inbound messages
+ * @rcv_nxt: next sequence number to expect for inbound messages
  * @deferred_queue: deferred queue saved OOS b'cast message received from node
  * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
  * @inputq: buffer queue for messages to be delivered upwards
@@ -151,15 +150,14 @@ struct tipc_link {
 
 	/* Management and link supervision data */
 	unsigned int flags;
-	u32 checkpoint;
 	u32 peer_session;
 	u32 peer_bearer_id;
 	u32 bearer_id;
 	u32 tolerance;
-	unsigned long cont_intv;
+	unsigned long keepalive_intv;
 	u32 abort_limit;
 	int state;
-	u32 fsm_msg_cnt;
+	u32 silent_intv_cnt;
 	struct {
 		unchar hdr[INT_H_SIZE];
 		unchar body[TIPC_MAX_IF_NAME];
@@ -185,13 +183,13 @@ struct tipc_link {
 		u16 len;
 		u16 limit;
 	} backlog[5];
-	u32 next_out_no;
+	u16 snd_nxt;
+	u16 last_retransm;
 	u32 window;
-	u32 last_retransmitted;
 	u32 stale_count;
 
 	/* Reception */
-	u32 next_in_no;
+	u16 rcv_nxt;
 	u32 rcv_unacked;
 	struct sk_buff_head deferdq;
 	struct sk_buff_head inputq;
@@ -213,8 +211,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 			      struct tipc_bearer *b_ptr,
 			      const struct tipc_media_addr *media_addr);
 void tipc_link_delete(struct tipc_link *link);
-void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
-			   bool shutting_down);
+void tipc_link_delete_list(struct net *net, unsigned int bearer_id);
 void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
 void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, struct tipc_link *dest);
 void tipc_link_reset_fragments(struct tipc_link *l_ptr);
@@ -223,7 +220,6 @@ int tipc_link_is_active(struct tipc_link *l_ptr);
 void tipc_link_purge_queues(struct tipc_link *l_ptr);
 void tipc_link_reset_all(struct tipc_node *node);
 void tipc_link_reset(struct tipc_link *l_ptr);
-void tipc_link_reset_list(struct net *net, unsigned int bearer_id);
 int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dest,
 		       u32 selector);
 int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dest,
@@ -247,39 +243,6 @@ int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
 void link_prepare_wakeup(struct tipc_link *l);
 
-/*
- * Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
- */
-static inline u32 buf_seqno(struct sk_buff *buf)
-{
-	return msg_seqno(buf_msg(buf));
-}
-
-static inline u32 mod(u32 x)
-{
-	return x & 0xffffu;
-}
-
-static inline int less_eq(u32 left, u32 right)
-{
-	return mod(right - left) < 32768u;
-}
-
-static inline int more(u32 left, u32 right)
-{
-	return !less_eq(left, right);
-}
-
-static inline int less(u32 left, u32 right)
-{
-	return less_eq(left, right) && (mod(right) != mod(left));
-}
-
-static inline u32 lesser(u32 left, u32 right)
-{
-	return less_eq(left, right) ? left : right;
-}
-
 static inline u32 link_own_addr(struct tipc_link *l)
 {
 	return msg_prevnode(l->pmsg);

net/tipc/msg.c

@@ -331,16 +331,15 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 
 /**
  * tipc_msg_bundle(): Append contents of a buffer to tail of an existing one
- * @bskb: the buffer to append to ("bundle")
- * @skb:  buffer to be appended
+ * @skb: the buffer to append to ("bundle")
+ * @msg:  message to be appended
  * @mtu:  max allowable size for the bundle buffer
  * Consumes buffer if successful
  * Returns true if bundling could be performed, otherwise false
  */
-bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
+bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu)
 {
 	struct tipc_msg *bmsg;
-	struct tipc_msg *msg = buf_msg(skb);
 	unsigned int bsz;
 	unsigned int msz = msg_size(msg);
 	u32 start, pad;
@@ -348,9 +347,9 @@ bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
 
 	if (likely(msg_user(msg) == MSG_FRAGMENTER))
 		return false;
-	if (!bskb)
+	if (!skb)
 		return false;
-	bmsg = buf_msg(bskb);
+	bmsg = buf_msg(skb);
 	bsz = msg_size(bmsg);
 	start = align(bsz);
 	pad = start - bsz;
@@ -359,18 +358,20 @@ bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu)
 		return false;
 	if (unlikely(msg_user(msg) == BCAST_PROTOCOL))
 		return false;
-	if (likely(msg_user(bmsg) != MSG_BUNDLER))
+	if (unlikely(msg_user(bmsg) != MSG_BUNDLER))
 		return false;
-	if (unlikely(skb_tailroom(bskb) < (pad + msz)))
+	if (unlikely(skb_tailroom(skb) < (pad + msz)))
 		return false;
 	if (unlikely(max < (start + msz)))
 		return false;
+	if ((msg_importance(msg) < TIPC_SYSTEM_IMPORTANCE) &&
+	    (msg_importance(bmsg) == TIPC_SYSTEM_IMPORTANCE))
+		return false;
 
-	skb_put(bskb, pad + msz);
-	skb_copy_to_linear_data_offset(bskb, start, skb->data, msz);
+	skb_put(skb, pad + msz);
+	skb_copy_to_linear_data_offset(skb, start, msg, msz);
 	msg_set_size(bmsg, start + msz);
 	msg_set_msgcnt(bmsg, msg_msgcnt(bmsg) + 1);
-	kfree_skb(skb);
 	return true;
 }
 
@@ -416,18 +417,18 @@ bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos)
 
 /**
  * tipc_msg_make_bundle(): Create bundle buf and append message to its tail
- * @list: the buffer chain
- * @skb: buffer to be appended and replaced
+ * @list: the buffer chain, where head is the buffer to replace/append
+ * @skb: buffer to be created, appended to and returned in case of success
+ * @msg: message to be appended
  * @mtu: max allowable size for the bundle buffer, inclusive header
  * @dnode: destination node for message. (Not always present in header)
- * Replaces buffer if successful
  * Returns true if success, otherwise false
  */
-bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode)
+bool tipc_msg_make_bundle(struct sk_buff **skb,  struct tipc_msg *msg,
+			  u32 mtu, u32 dnode)
 {
-	struct sk_buff *bskb;
+	struct sk_buff *_skb;
 	struct tipc_msg *bmsg;
-	struct tipc_msg *msg = buf_msg(*skb);
 	u32 msz = msg_size(msg);
 	u32 max = mtu - INT_H_SIZE;
 
@@ -440,19 +441,23 @@ bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode)
 	if (msz > (max / 2))
 		return false;
 
-	bskb = tipc_buf_acquire(max);
-	if (!bskb)
+	_skb = tipc_buf_acquire(max);
+	if (!_skb)
 		return false;
 
-	skb_trim(bskb, INT_H_SIZE);
-	bmsg = buf_msg(bskb);
+	skb_trim(_skb, INT_H_SIZE);
+	bmsg = buf_msg(_skb);
 	tipc_msg_init(msg_prevnode(msg), bmsg, MSG_BUNDLER, 0,
 		      INT_H_SIZE, dnode);
+	if (msg_isdata(msg))
+		msg_set_importance(bmsg, TIPC_CRITICAL_IMPORTANCE);
+	else
+		msg_set_importance(bmsg, TIPC_SYSTEM_IMPORTANCE);
 	msg_set_seqno(bmsg, msg_seqno(msg));
 	msg_set_ack(bmsg, msg_ack(msg));
 	msg_set_bcast_ack(bmsg, msg_bcast_ack(msg));
-	tipc_msg_bundle(bskb, *skb, mtu);
-	*skb = bskb;
+	tipc_msg_bundle(_skb, msg, mtu);
+	*skb = _skb;
 	return true;
 }
 

net/tipc/msg.h

@@ -313,12 +313,12 @@ static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
 	msg_set_bits(m, 1, 19, 0x3, n);
 }
 
-static inline u32 msg_bcast_ack(struct tipc_msg *m)
+static inline u16 msg_bcast_ack(struct tipc_msg *m)
 {
 	return msg_bits(m, 1, 0, 0xffff);
 }
 
-static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
+static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
 {
 	msg_set_bits(m, 1, 0, 0xffff, n);
 }
@@ -327,22 +327,22 @@ static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
 /*
  * Word 2
  */
-static inline u32 msg_ack(struct tipc_msg *m)
+static inline u16 msg_ack(struct tipc_msg *m)
 {
 	return msg_bits(m, 2, 16, 0xffff);
 }
 
-static inline void msg_set_ack(struct tipc_msg *m, u32 n)
+static inline void msg_set_ack(struct tipc_msg *m, u16 n)
 {
 	msg_set_bits(m, 2, 16, 0xffff, n);
 }
 
-static inline u32 msg_seqno(struct tipc_msg *m)
+static inline u16 msg_seqno(struct tipc_msg *m)
 {
 	return msg_bits(m, 2, 0, 0xffff);
 }
 
-static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
+static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
 {
 	msg_set_bits(m, 2, 0, 0xffff, n);
 }
@@ -352,18 +352,22 @@ static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
  */
 static inline u32 msg_importance(struct tipc_msg *m)
 {
-	if (unlikely(msg_user(m) == MSG_FRAGMENTER))
+	int usr = msg_user(m);
+
+	if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
+		return usr;
+	if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
 		return msg_bits(m, 5, 13, 0x7);
-	if (likely(msg_isdata(m) && !msg_errcode(m)))
-		return msg_user(m);
 	return TIPC_SYSTEM_IMPORTANCE;
 }
 
 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
 {
-	if (unlikely(msg_user(m) == MSG_FRAGMENTER))
+	int usr = msg_user(m);
+
+	if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
 		msg_set_bits(m, 5, 13, 0x7, i);
-	else if (likely(i < TIPC_SYSTEM_IMPORTANCE))
+	else if (i < TIPC_SYSTEM_IMPORTANCE)
 		msg_set_user(m, i);
 	else
 		pr_warn("Trying to set illegal importance in message\n");
@@ -772,9 +776,9 @@ struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
 				uint data_sz, u32 dnode, u32 onode,
 				u32 dport, u32 oport, int errcode);
 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
-bool tipc_msg_bundle(struct sk_buff *bskb, struct sk_buff *skb, u32 mtu);
-
-bool tipc_msg_make_bundle(struct sk_buff **skb, u32 mtu, u32 dnode);
+bool tipc_msg_bundle(struct sk_buff *skb, struct tipc_msg *msg, u32 mtu);
+bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
+			  u32 mtu, u32 dnode);
 bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
 int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
 		   int offset, int dsz, int mtu, struct sk_buff_head *list);
@@ -782,6 +786,11 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, u32 *dnode,
 			  int *err);
 struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list);
 
+static inline u16 buf_seqno(struct sk_buff *skb)
+{
+	return msg_seqno(buf_msg(skb));
+}
+
 /* tipc_skb_peek(): peek and reserve first buffer in list
  * @list: list to be peeked in
  * Returns pointer to first buffer in list, if any

net/tipc/net.c

@@ -40,6 +40,7 @@
 #include "subscr.h"
 #include "socket.h"
 #include "node.h"
+#include "bcast.h"
 
 static const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
 	[TIPC_NLA_NET_UNSPEC]	= { .type = NLA_UNSPEC },

net/tipc/node.c

 /*
  * net/tipc/node.c: TIPC node management routines
  *
- * Copyright (c) 2000-2006, 2012-2014, Ericsson AB
+ * Copyright (c) 2000-2006, 2012-2015, Ericsson AB
  * Copyright (c) 2005-2006, 2010-2014, Wind River Systems
  * All rights reserved.
  *
@@ -39,6 +39,7 @@
 #include "node.h"
 #include "name_distr.h"
 #include "socket.h"
+#include "bcast.h"
 
 static void node_lost_contact(struct tipc_node *n_ptr);
 static void node_established_contact(struct tipc_node *n_ptr);

net/tipc/node.h

@@ -45,8 +45,6 @@
 /* Out-of-range value for node signature */
 #define INVALID_NODE_SIG	0x10000
 
-#define NODE_HTABLE_SIZE	512
-
 /* Flags used to take different actions according to flag type
  * TIPC_WAIT_PEER_LINKS_DOWN: wait to see that peer's links are down
  * TIPC_WAIT_OWN_LINKS_DOWN: wait until peer node is declared down

net/tipc/socket.c

@@ -41,6 +41,7 @@
 #include "link.h"
 #include "name_distr.h"
 #include "socket.h"
+#include "bcast.h"
 
 #define SS_LISTENING		-1	/* socket is listening */
 #define SS_READY		-2	/* socket is connectionless */