RDS: Track transports via an array, not a list

Now that transports can be loaded in arbitrary order,
it is important for rds_trans_get_preferred() to look
for them in a particular order, instead of walking the list
until it finds a transport that works for a given address.
Now, each transport registers for a specific transport slot,
and these are ordered so that preferred transports come first,
and then if they are not loaded, other transports are queried.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 290566c69d28..85d6f897ecc7 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -311,11 +311,17 @@ struct rds_notifier {
  * 		   flag and header.
  */
 
+#define RDS_TRANS_IB	0
+#define RDS_TRANS_IWARP	1
+#define RDS_TRANS_TCP	2
+#define RDS_TRANS_COUNT	3
+
 struct rds_transport {
 	char			t_name[TRANSNAMSIZ];
 	struct list_head	t_item;
 	struct module		*t_owner;
 	unsigned int		t_prefer_loopback:1;
+	unsigned int		t_type;
 
 	int (*laddr_check)(__be32 addr);
 	int (*conn_alloc)(struct rds_connection *conn, gfp_t gfp);