RDS: IB: add connection info to ibmr

Preperatory patch for FRMR support. From connection info,
we can retrieve cm_id which contains qp handled needed for
work request posting.

We also need to drop the RDS connection on QP error states
where connection handle becomes useful.
Signed-off-by: NSantosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/ib_mr.h

@@ -52,6 +52,7 @@ struct rds_ib_fmr {
 struct rds_ib_mr {
 	struct rds_ib_device		*device;
 	struct rds_ib_mr_pool		*pool;
+	struct rds_ib_connection	*ic;
 
 	struct llist_node		llnode;