RDS: Add a debug message suggesting to load transport modules

Now that RDS transports are no longer compiled-in to RDS core,
there is now the possibility that they will not be loaded. This
adds a helpful suggestion when rds_bind() fails to find a transport.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/net/rds/bind.c b/net/rds/bind.c
index c17cc39160c..5d95fc007f1 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c
@@ -187,6 +187,9 @@ int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
         if (trans == NULL) {
                 ret = -EADDRNOTAVAIL;
                 rds_remove_bound(rs);
+                if (printk_ratelimit())
+                        printk(KERN_INFO "RDS: rds_bind() could not find a transport, "
+                                "load rds_tcp or rds_rdma?\n");
                 goto out;
         }