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Subject[PATCH 4.20 311/352] net/mlx5e: Use the inner headers to determine tc/pedit offload limitation on decap flows
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guy Shattah <sguy@mellanox.com>

[ Upstream commit 1651925d403e077e3fc86f961905e27c6810e132 ]

In packets that need to be decaped the internal headers
have to be checked, not the external ones.

Fixes: bdd66ac0aeed ("net/mlx5e: Disallow TC offloading of unsupported match/action combinations")
Signed-off-by: Guy Shattah <sguy@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2133,6 +2133,7 @@ static bool csum_offload_supported(struc

static bool modify_header_match_supported(struct mlx5_flow_spec *spec,
struct tcf_exts *exts,
+ u32 match_actions,
struct netlink_ext_ack *extack)
{
const struct tc_action *a;
@@ -2143,7 +2144,11 @@ static bool modify_header_match_supporte
u16 ethertype;
int nkeys, i;

- headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, outer_headers);
+ if (match_actions & MLX5_FLOW_CONTEXT_ACTION_DECAP)
+ headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, inner_headers);
+ else
+ headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, outer_headers);
+
ethertype = MLX5_GET(fte_match_set_lyr_2_4, headers_v, ethertype);

/* for non-IP we only re-write MACs, so we're okay */
@@ -2200,7 +2205,7 @@ static bool actions_match_supported(stru

if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)
return modify_header_match_supported(&parse_attr->spec, exts,
- extack);
+ actions, extack);

return true;
}

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