RDS: split out connection specific state from rds_connection to rds_conn_path

In preparation for multipath RDS, split the rds_connection
structure into a base structure, and a per-path struct rds_conn_path.
The base structure tracks information and locks common to all
paths. The workqs for send/recv/shutdown etc are tracked per
rds_conn_path. Thus the workq callbacks now work with rds_conn_path.

This commit allows for one rds_conn_path per rds_connection, and will
be extended into multiple conn_paths in  subsequent commits.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/send.c b/net/rds/send.c
index b1962f8..a3b3b35 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -40,6 +40,7 @@
 #include <linux/export.h>
 #include <linux/sizes.h>
 
+#include "rds_single_path.h"
 #include "rds.h"
 
 /* When transmitting messages in rds_send_xmit, we need to emerge from