net/mlx5e: E-Switch, Offload all chain 0 priorities when modify header and...

net/mlx5e: E-Switch, Offload all chain 0 priorities when modify header and forward action is not supported

Miss path handling of tc multi chain filters (i.e. filters that are
defined on chain > 0) requires the hardware to communicate to the
driver the last chain that was processed. This is possible only when
the hardware is capable of performing the combination of modify header
and forward to table actions. Currently, if the hardware is missing
this capability then the driver only offloads rules that are defined
on tc chain 0 prio 1. However, this restriction can be relaxed because
packets that miss from chain 0 are processed through all the
priorities by tc software.

Allow the offload of all the supported priorities for chain 0 even
when the hardware is not capable to perform modify header and goto
table actions.
Signed-off-by: Jianbo Liu <jianbol@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -1317,12 +1317,6 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 	int err = 0;
 	int out_index;
 
-	if (!mlx5_chains_prios_supported(esw_chains(esw)) && attr->prio != 1) {
-		NL_SET_ERR_MSG_MOD(extack,
-				   "E-switch priorities unsupported, upgrade FW");
-		return -EOPNOTSUPP;
-	}
-
 	/* We check chain range only for tc flows.
 	 * For ft flows, we checked attr->chain was originally 0 and set it to
 	 * FDB_FT_CHAIN which is outside tc range.

drivers/net/ethernet/mellanox/mlx5/core/lib/fs_chains.c

@@ -141,9 +141,6 @@ u32 mlx5_chains_get_nf_ft_chain(struct mlx5_fs_chains *chains)
 
 u32 mlx5_chains_get_prio_range(struct mlx5_fs_chains *chains)
 {
-	if (!mlx5_chains_prios_supported(chains))
-		return 1;
-
 	if (mlx5_chains_ignore_flow_level_supported(chains))
 		return UINT_MAX;