mlxsw: Add fields for mlxsw's meta header for adjacency table

This patch adds field for mlxsw's meta header which will be used to
describe the match/action behavior of the adjacency table.

The fields are:
1. Adj_index - The global index of the nexthop group in the adjacency
   table.

2. Adj_hash_index - Local index offset which is based on packets hash
   mod the nexthop group size.
Signed-off-by: NArkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_dpipe.c

@@ -43,6 +43,8 @@ enum mlxsw_sp_field_metadata_id {
 	MLXSW_SP_DPIPE_FIELD_METADATA_ERIF_PORT,
 	MLXSW_SP_DPIPE_FIELD_METADATA_L3_FORWARD,
 	MLXSW_SP_DPIPE_FIELD_METADATA_L3_DROP,
+	MLXSW_SP_DPIPE_FIELD_METADATA_ADJ_INDEX,
+	MLXSW_SP_DPIPE_FIELD_METADATA_ADJ_HASH_INDEX,
 };
 
 static struct devlink_dpipe_field mlxsw_sp_dpipe_fields_metadata[] = {
@@ -62,6 +64,16 @@ static struct devlink_dpipe_field mlxsw_sp_dpipe_fields_metadata[] = {
 		.id = MLXSW_SP_DPIPE_FIELD_METADATA_L3_DROP,
 		.bitwidth = 1,
 	},
+	{
+		.name = "adj_index",
+		.id = MLXSW_SP_DPIPE_FIELD_METADATA_ADJ_INDEX,
+		.bitwidth = 32,
+	},
+	{
+		.name = "adj_hash_index",
+		.id = MLXSW_SP_DPIPE_FIELD_METADATA_ADJ_HASH_INDEX,
+		.bitwidth = 32,
+	},
 };
 
 enum mlxsw_sp_dpipe_header_id {