From: Paul Blakey <paulb@mellanox.com>
Date: Thu, 12 Mar 2020 12:23:12 +0200
Subject: net/mlx5: E-Switch, Support getting chain mapping
Patch-mainline: v5.7-rc1
Git-commit: 43435e91396fd156a31f0e3977f60f564a66a328
References: jsc#SLE-15172

Currently, we write chain register mapping on miss from the the last
prio of a chain. It is used to restore the chain in software.

To support re-using the chain register mapping from global tables (such
as CT tuple table) misses, export the chain mapping.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c |   13 ++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h |    7 +++++
 2 files changed, 20 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c
@@ -900,6 +900,19 @@ mlx5_esw_chains_destroy(struct mlx5_eswi
 	mlx5_esw_chains_cleanup(esw);
 }
 
+int
+mlx5_esw_chains_get_chain_mapping(struct mlx5_eswitch *esw, u32 chain,
+				  u32 *chain_mapping)
+{
+	return mapping_add(esw_chains_mapping(esw), &chain, chain_mapping);
+}
+
+int
+mlx5_esw_chains_put_chain_mapping(struct mlx5_eswitch *esw, u32 chain_mapping)
+{
+	return mapping_remove(esw_chains_mapping(esw), chain_mapping);
+}
+
 int mlx5_eswitch_get_chain_for_tag(struct mlx5_eswitch *esw, u32 tag,
 				   u32 *chain)
 {
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.h
@@ -31,6 +31,13 @@ void
 mlx5_esw_chains_destroy_global_table(struct mlx5_eswitch *esw,
 				     struct mlx5_flow_table *ft);
 
+int
+mlx5_esw_chains_get_chain_mapping(struct mlx5_eswitch *esw, u32 chain,
+				  u32 *chain_mapping);
+int
+mlx5_esw_chains_put_chain_mapping(struct mlx5_eswitch *esw,
+				  u32 chain_mapping);
+
 int mlx5_esw_chains_create(struct mlx5_eswitch *esw);
 void mlx5_esw_chains_destroy(struct mlx5_eswitch *esw);