tipc: move bcast definitions to bcast.c

Currently, a number of structure and function definitions related
to the broadcast functionality are unnecessarily exposed in the file
bcast.h. This obscures the fact that the external interface towards
the broadcast link in fact is very narrow, and causes unnecessary
recompilations of other files when anything changes in those
definitions.

In this commit, we move as many of those definitions as is currently
possible to the file bcast.c.

We also rename the structure 'tipc_bclink' to 'tipc_bc_base', both
since the name does not correctly describe the contents of this
struct, and will do so even less in the future, and because we want
to use the term 'link' more appropriately in the functionality
introduced later in this series.

Finally, we rename a couple of functions, such as tipc_bclink_xmit()
and others that will be kept in the future, to include the term 'bcast'
instead.

There are no functional changes in this commit.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 93 insertions, 24 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index eadba62afa85..2c5f5443354a 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -35,11 +35,13 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <linux/tipc_config.h>
 #include "socket.h"
 #include "msg.h"
 #include "bcast.h"
 #include "name_distr.h"
-#include "core.h"
+#include "link.h"
+#include "node.h"
 
 #define	MAX_PKT_DEFAULT_MCAST	1500	/* bcast link max packet size (fixed) */
 #define	BCLINK_WIN_DEFAULT	50	/* bcast link window size (default) */
@@ -47,34 +49,101 @@
 
 const char tipc_bclink_name[] = "broadcast-link";
 
+/**
+ * struct tipc_bcbearer_pair - a pair of bearers used by broadcast link
+ * @primary: pointer to primary bearer
+ * @secondary: pointer to secondary bearer
+ *
+ * Bearers must have same priority and same set of reachable destinations
+ * to be paired.
+ */
+
+struct tipc_bcbearer_pair {
+	struct tipc_bearer *primary;
+	struct tipc_bearer *secondary;
+};
+
+#define	BCBEARER		MAX_BEARERS
+
+/**
+ * struct tipc_bcbearer - bearer used by broadcast link
+ * @bearer: (non-standard) broadcast bearer structure
+ * @media: (non-standard) broadcast media structure
+ * @bpairs: array of bearer pairs
+ * @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort()
+ * @remains: temporary node map used by tipc_bcbearer_send()
+ * @remains_new: temporary node map used tipc_bcbearer_send()
+ *
+ * Note: The fields labelled "temporary" are incorporated into the bearer
+ * to avoid consuming potentially limited stack space through the use of
+ * large local variables within multicast routines.  Concurrent access is
+ * prevented through use of the spinlock "bcast_lock".
+ */
+struct tipc_bcbearer {
+	struct tipc_bearer bearer;
+	struct tipc_media media;
+	struct tipc_bcbearer_pair bpairs[MAX_BEARERS];
+	struct tipc_bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
+	struct tipc_node_map remains;
+	struct tipc_node_map remains_new;
+};
+
+/**
+ * struct tipc_bc_base - link used for broadcast messages
+ * @lock: spinlock governing access to structure
+ * @link: (non-standard) broadcast link structure
+ * @node: (non-standard) node structure representing b'cast link's peer node
+ * @bcast_nodes: map of broadcast-capable nodes
+ * @retransmit_to: node that most recently requested a retransmit
+ *
+ * Handles sequence numbering, fragmentation, bundling, etc.
+ */
+struct tipc_bc_base {
+	spinlock_t lock; /* spinlock protecting broadcast structs */
+	struct tipc_link link;
+	struct tipc_node node;
+	struct sk_buff_head arrvq;
+	struct sk_buff_head inputq;
+	struct tipc_node_map bcast_nodes;
+	struct tipc_node *retransmit_to;
+};
+
+/**
+ * tipc_nmap_equal - test for equality of node maps
+ */
+static int tipc_nmap_equal(struct tipc_node_map *nm_a,
+			   struct tipc_node_map *nm_b)
+{
+	return !memcmp(nm_a, nm_b, sizeof(*nm_a));
+}
+
 static void tipc_nmap_diff(struct tipc_node_map *nm_a,
 			   struct tipc_node_map *nm_b,
 			   struct tipc_node_map *nm_diff);
 static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node);
 static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node);
-
 static void tipc_bclink_lock(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-	spin_lock_bh(&tn->bclink->lock);
+	spin_lock_bh(&tn->bcbase->lock);
 }
 
 static void tipc_bclink_unlock(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-	spin_unlock_bh(&tn->bclink->lock);
+	spin_unlock_bh(&tn->bcbase->lock);
 }
 
 void tipc_bclink_input(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-	tipc_sk_mcast_rcv(net, &tn->bclink->arrvq, &tn->bclink->inputq);
+	tipc_sk_mcast_rcv(net, &tn->bcbase->arrvq, &tn->bcbase->inputq);
 }
 
-uint  tipc_bclink_get_mtu(void)
+uint  tipc_bcast_get_mtu(void)
 {
 	return MAX_PKT_DEFAULT_MCAST;
 }
@@ -99,7 +168,7 @@ void tipc_bclink_add_node(struct net *net, u32 addr)
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
 	tipc_bclink_lock(net);
-	tipc_nmap_add(&tn->bclink->bcast_nodes, addr);
+	tipc_nmap_add(&tn->bcbase->bcast_nodes, addr);
 	tipc_bclink_unlock(net);
 }
 
@@ -108,11 +177,11 @@ void tipc_bclink_remove_node(struct net *net, u32 addr)
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
 	tipc_bclink_lock(net);
-	tipc_nmap_remove(&tn->bclink->bcast_nodes, addr);
+	tipc_nmap_remove(&tn->bcbase->bcast_nodes, addr);
 
 	/* Last node? => reset backlog queue */
-	if (!tn->bclink->bcast_nodes.count)
-		tipc_link_purge_backlog(&tn->bclink->link);
+	if (!tn->bcbase->bcast_nodes.count)
+		tipc_link_purge_backlog(&tn->bcbase->link);
 
 	tipc_bclink_unlock(net);
 }
@@ -147,7 +216,7 @@ struct tipc_node *tipc_bclink_retransmit_to(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
-	return tn->bclink->retransmit_to;
+	return tn->bcbase->retransmit_to;
 }
 
 /**
@@ -241,7 +310,7 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked)
 		 * acknowledge sent messages only (if other nodes still exist)
 		 * or both sent and unsent messages (otherwise)
 		 */
-		if (tn->bclink->bcast_nodes.count)
+		if (tn->bcbase->bcast_nodes.count)
 			acked = tn->bcl->silent_intv_cnt;
 		else
 			acked = tn->bcl->snd_nxt;
@@ -390,18 +459,18 @@ static void bclink_peek_nack(struct net *net, struct tipc_msg *msg)
 	tipc_node_put(n_ptr);
 }
 
-/* tipc_bclink_xmit - deliver buffer chain to all nodes in cluster
+/* tipc_bcast_xmit - deliver buffer chain to all nodes in cluster
  *                    and to identified node local sockets
  * @net: the applicable net namespace
  * @list: chain of buffers containing message
  * Consumes the buffer chain, except when returning -ELINKCONG
  * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
  */
-int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list)
+int tipc_bcast_xmit(struct net *net, struct sk_buff_head *list)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_link *bcl = tn->bcl;
-	struct tipc_bclink *bclink = tn->bclink;
+	struct tipc_bc_base *bclink = tn->bcbase;
 	int rc = 0;
 	int bc = 0;
 	struct sk_buff *skb;
@@ -508,7 +577,7 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf)
 			tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
 			tipc_bclink_lock(net);
 			bcl->stats.recv_nacks++;
-			tn->bclink->retransmit_to = node;
+			tn->bcbase->retransmit_to = node;
 			bclink_retransmit_pkt(tn, msg_bcgap_after(msg),
 					      msg_bcgap_to(msg));
 			tipc_bclink_unlock(net);
@@ -524,8 +593,8 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf)
 	/* Handle in-sequence broadcast message */
 	seqno = msg_seqno(msg);
 	next_in = mod(node->bclink.last_in + 1);
-	arrvq = &tn->bclink->arrvq;
-	inputq = &tn->bclink->inputq;
+	arrvq = &tn->bcbase->arrvq;
+	inputq = &tn->bcbase->inputq;
 
 	if (likely(seqno == next_in)) {
 receive:
@@ -651,7 +720,7 @@ static int tipc_bcbearer_send(struct net *net, struct sk_buff *buf,
 	struct tipc_msg *msg = buf_msg(buf);
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_bcbearer *bcbearer = tn->bcbearer;
-	struct tipc_bclink *bclink = tn->bclink;
+	struct tipc_bc_base *bclink = tn->bcbase;
 
 	/* Prepare broadcast link message for reliable transmission,
 	 * if first time trying to send it;
@@ -940,11 +1009,11 @@ int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[])
 	return tipc_bclink_set_queue_limits(net, win);
 }
 
-int tipc_bclink_init(struct net *net)
+int tipc_bcast_init(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_bcbearer *bcbearer;
-	struct tipc_bclink *bclink;
+	struct tipc_bc_base *bclink;
 	struct tipc_link *bcl;
 
 	bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC);
@@ -981,12 +1050,12 @@ int tipc_bclink_init(struct net *net)
 	msg_set_prevnode(bcl->pmsg, tn->own_addr);
 	strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);
 	tn->bcbearer = bcbearer;
-	tn->bclink = bclink;
+	tn->bcbase = bclink;
 	tn->bcl = bcl;
 	return 0;
 }
 
-void tipc_bclink_stop(struct net *net)
+void tipc_bcast_stop(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 
@@ -997,7 +1066,7 @@ void tipc_bclink_stop(struct net *net)
 	RCU_INIT_POINTER(tn->bearer_list[BCBEARER], NULL);
 	synchronize_net();
 	kfree(tn->bcbearer);
-	kfree(tn->bclink);
+	kfree(tn->bcbase);
 }
 
 /**