[IPV4] fib_trie: use hash list

The code to dump can use the existing hash chain rather than doing
repeated lookup.
Signed-off-by: NStephen Hemminger <stephen.hemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/fib_trie.c

@@ -2399,22 +2399,22 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
 
 	} else {
 		struct leaf *l = (struct leaf *) n;
-		int i;
+		struct leaf_info *li;
+		struct hlist_node *node;
+
 		__be32 val = htonl(l->key);
 
 		seq_indent(seq, iter->depth);
 		seq_printf(seq, "  |-- %d.%d.%d.%d\n", NIPQUAD(val));
-		for (i = 32; i >= 0; i--) {
-			struct leaf_info *li = find_leaf_info(l, i);
 
-			if (li) {
+		hlist_for_each_entry_rcu(li, node, &l->list, hlist) {
 			struct fib_alias *fa;
 
 			list_for_each_entry_rcu(fa, &li->falh, fa_list) {
 				char buf1[32], buf2[32];
 
 				seq_indent(seq, iter->depth+1);
-					seq_printf(seq, "  /%d %s %s", i,
+				seq_printf(seq, "  /%d %s %s", li->plen,
 					   rtn_scope(buf1, sizeof(buf1),
 						     fa->fa_scope),
 					   rtn_type(buf2, sizeof(buf2),
@@ -2426,7 +2426,6 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
 			}
 		}
 	}
-	}
 
 	return 0;
 }
@@ -2477,8 +2476,8 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 {
 	const struct fib_trie_iter *iter = seq->private;
 	struct leaf *l = v;
-	int i;
-	char bf[128];
+	struct leaf_info *li;
+	struct hlist_node *node;
 
 	if (v == SEQ_START_TOKEN) {
 		seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
@@ -2493,8 +2492,7 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 	if (IS_TNODE(l))
 		return 0;
 
-	for (i = 32; i >= 0; i--) {
-		struct leaf_info *li = find_leaf_info(l, i);
+	hlist_for_each_entry_rcu(li, node, &l->list, hlist) {
 		struct fib_alias *fa;
 		__be32 mask, prefix;
 
@@ -2507,6 +2505,7 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
 		list_for_each_entry_rcu(fa, &li->falh, fa_list) {
 			const struct fib_info *fi = fa->fa_info;
 			unsigned flags = fib_flag_trans(fa->fa_type, mask, fi);
+			char bf[128];
 
 			if (fa->fa_type == RTN_BROADCAST
 			    || fa->fa_type == RTN_MULTICAST)