[TIPC] Updated link priority macros

Added macros for min/default/max link priority in tipc_config.h.
Also renamed TIPC_NUM_LINK_PRI to TIPC_MEDIA_LINK_PRI since that
is a more accurate description of what it is used for.

Signed-off-by: Per Liden <per.liden@ericsson.com>

include/linux/tipc_config.h

@@ -168,10 +168,13 @@
 #define TIPC_MAX_LINK_NAME	60	/* format = Z.C.N:interface-Z.C.N:interface */
 
 /*
- * Link priority limits (range from 0 to # priorities - 1)
+ * Link priority limits (min, default, max, media default)
  */
 
-#define TIPC_NUM_LINK_PRI 32
+#define TIPC_MIN_LINK_PRI	0
+#define TIPC_DEF_LINK_PRI	10
+#define TIPC_MAX_LINK_PRI	31
+#define TIPC_MEDIA_LINK_PRI	(TIPC_MAX_LINK_PRI + 1)
 
 /*
  * Link tolerance limits (min, default, max), in ms

net/tipc/bcast.c

@@ -82,7 +82,7 @@ struct bcbearer {
 	struct bearer bearer;
 	struct media media;
 	struct bcbearer_pair bpairs[MAX_BEARERS];
-	struct bcbearer_pair bpairs_temp[TIPC_NUM_LINK_PRI];
+	struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
 };
 
 /**
@@ -630,7 +630,7 @@ void bcbearer_sort(void)
 	bp_curr = bcbearer->bpairs;
 	memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
 
-	for (pri = (TIPC_NUM_LINK_PRI - 1); pri >= 0; pri--) {
+	for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
 
 		if (!bp_temp[pri].primary)
 			continue;

net/tipc/bearer.c

@@ -119,7 +119,8 @@ int  tipc_register_media(u32 media_type,
 		warn("Media registration error: no broadcast address supplied\n");
 		goto exit;
 	}
-	if (bearer_priority >= TIPC_NUM_LINK_PRI) {
+	if ((bearer_priority < TIPC_MIN_LINK_PRI) &&
+	    (bearer_priority > TIPC_MAX_LINK_PRI)) {
 		warn("Media registration error: priority %u\n", bearer_priority);
 		goto exit;
 	}
@@ -476,10 +477,15 @@ int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
 
 	if (tipc_mode != TIPC_NET_MODE)
 		return -ENOPROTOOPT;
+
 	if (!bearer_name_validate(name, &b_name) ||
 	    !addr_domain_valid(bcast_scope) ||
-	    !in_scope(bcast_scope, tipc_own_addr) ||
-	    (priority > TIPC_NUM_LINK_PRI))
+	    !in_scope(bcast_scope, tipc_own_addr))
+		return -EINVAL;
+
+	if ((priority < TIPC_MIN_LINK_PRI ||
+	     priority > TIPC_MAX_LINK_PRI) &&
+	    (priority != TIPC_MEDIA_LINK_PRI))
 		return -EINVAL;
 
 	write_lock_bh(&net_lock);
@@ -491,7 +497,8 @@ int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
 		warn("No media <%s>\n", b_name.media_name);
 		goto failed;
 	}
-	if (priority == TIPC_NUM_LINK_PRI)
+
+	if (priority == TIPC_MEDIA_LINK_PRI)
 		priority = m_ptr->priority;
 
 restart:
@@ -547,8 +554,8 @@ restart:
 	}
 	b_ptr->publ.lock = SPIN_LOCK_UNLOCKED;
 	write_unlock_bh(&net_lock);
-	info("Enabled bearer <%s>, discovery domain %s\n",
-	     name, addr_string_fill(addr_string, bcast_scope));
+	info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
+	     name, addr_string_fill(addr_string, bcast_scope), priority);
 	return 0;
 failed:
 	write_unlock_bh(&net_lock);

net/tipc/eth_media.c

@@ -42,9 +42,9 @@
 
 #define MAX_ETH_BEARERS		2
 #define TIPC_PROTOCOL		0x88ca
-#define ETH_LINK_PRIORITY	10
+#define ETH_LINK_PRIORITY	TIPC_DEF_LINK_PRI
 #define ETH_LINK_TOLERANCE	TIPC_DEF_LINK_TOL
-
+#define ETH_LINK_WINDOW		TIPC_DEF_LINK_WIN
 
 /**
  * struct eth_bearer - Ethernet bearer data structure
@@ -260,7 +260,7 @@ int eth_media_start(void)
 	res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
 				  enable_bearer, disable_bearer, send_msg, 
 				  eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY, 
-				  ETH_LINK_TOLERANCE, TIPC_DEF_LINK_WIN);
+				  ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
 	if (res)
 		return res;
 

net/tipc/link.c

@@ -2812,7 +2812,8 @@ struct sk_buff *link_cmd_config(const void *req_tlv_area, int req_tlv_space,
 		}
 		break;
 	case TIPC_CMD_SET_LINK_PRI: 
-		if (new_value < TIPC_NUM_LINK_PRI) {
+		if ((new_value >= TIPC_MIN_LINK_PRI) &&
+		    (new_value <= TIPC_MAX_LINK_PRI)) {
 			l_ptr->priority = new_value;
 			link_send_proto_msg(l_ptr, STATE_MSG, 
 					    0, 0, 0, new_value, 0);