RDS: Remove struct rds_rdma_op

A big changeset, but it's all pretty dumb.

struct rds_rdma_op was already embedded in struct rm_rdma_op.
Remove rds_rdma_op and put its members in rm_rdma_op. Rename
members with "op_" prefix instead of "r_", for consistency.

Of course this breaks a lot, so fixup the code accordingly.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/iw.h b/net/rds/iw.h
index 6f08300..f112105 100644
--- a/net/rds/iw.h
+++ b/net/rds/iw.h
@@ -70,7 +70,7 @@
 	struct rds_message	*s_rm;
 
 	/* We should really put these into a union: */
-	struct rds_rdma_op	*s_op;
+	struct rm_rdma_op	*s_op;
 	struct rds_iw_mapping	*s_mapping;
 	struct ib_mr		*s_mr;
 	struct ib_fast_reg_page_list *s_page_list;
@@ -357,7 +357,7 @@
 void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context);
 void rds_iw_send_init_ring(struct rds_iw_connection *ic);
 void rds_iw_send_clear_ring(struct rds_iw_connection *ic);
-int rds_iw_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
+int rds_iw_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
 void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
 int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,