net/mlx5e: Support accept action

Support TC generic 'accept' action in mlx5 by introducing
MLX5_ESW_ATTR_FLAG_ACCEPT attribute flag. Flag has similar semantics to
existing MLX5_ESW_ATTR_FLAG_SLOW_PATH flag, however, dedicated flag is
required because existing 'slow path' flag can be flipped by tunneling
subsystem when neighbor changes state.

Introduce new helper function mlx5_esw_attr_flags_skip() to check whether
attribute flags for 'slow path' or 'accept' action are set and use it in
eswitch code instead of direct bit manipulation.
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Reviewed-by: Paul Blakey <paulb@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -3810,6 +3810,11 @@ static int parse_tc_fdb_actions(struct mlx5e_priv *priv,
 
 	flow_action_for_each(i, act, flow_action) {
 		switch (act->id) {
+		case FLOW_ACTION_ACCEPT:
+			action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
+				MLX5_FLOW_CONTEXT_ACTION_COUNT;
+			attr->flags |= MLX5_ESW_ATTR_FLAG_ACCEPT;
+			break;
 		case FLOW_ACTION_DROP:
 			action |= MLX5_FLOW_CONTEXT_ACTION_DROP |
 				  MLX5_FLOW_CONTEXT_ACTION_COUNT;

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -447,8 +447,16 @@ enum {
 	MLX5_ESW_ATTR_FLAG_NO_IN_PORT    = BIT(2),
 	MLX5_ESW_ATTR_FLAG_SRC_REWRITE   = BIT(3),
 	MLX5_ESW_ATTR_FLAG_SAMPLE        = BIT(4),
+	MLX5_ESW_ATTR_FLAG_ACCEPT        = BIT(5),
 };
 
+/* Returns true if any of the flags that require skipping further TC/NF processing are set. */
+static inline bool
+mlx5_esw_attr_flags_skip(u32 attr_flags)
+{
+	return attr_flags & (MLX5_ESW_ATTR_FLAG_SLOW_PATH | MLX5_ESW_ATTR_FLAG_ACCEPT);
+}
+
 struct mlx5_esw_flow_attr {
 	struct mlx5_eswitch_rep *in_rep;
 	struct mlx5_core_dev	*in_mdev;

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

@@ -440,7 +440,7 @@ esw_setup_dests(struct mlx5_flow_destination *dest,
 	} else if (attr->dest_ft) {
 		esw_setup_ft_dest(dest, flow_act, esw, attr, spec, *i);
 		(*i)++;
-	} else if (attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH) {
+	} else if (mlx5_esw_attr_flags_skip(attr->flags)) {
 		esw_setup_slow_path_dest(dest, flow_act, chains, *i);
 		(*i)++;
 	} else if (attr->dest_chain) {
@@ -467,7 +467,7 @@ esw_cleanup_dests(struct mlx5_eswitch *esw,
 
 	if (attr->dest_ft) {
 		esw_cleanup_decap_indir(esw, attr);
-	} else if (!(attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH)) {
+	} else if (!mlx5_esw_attr_flags_skip(attr->flags)) {
 		if (attr->dest_chain)
 			esw_cleanup_chain_dest(chains, attr->dest_chain, 1, 0);
 		else if (esw_is_indir_table(esw, attr))
@@ -678,7 +678,7 @@ __mlx5_eswitch_del_rule(struct mlx5_eswitch *esw,
 
 	mlx5_del_flow_rules(rule);
 
-	if (!(attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH)) {
+	if (!mlx5_esw_attr_flags_skip(attr->flags)) {
 		/* unref the term table */
 		for (i = 0; i < MLX5_MAX_FLOW_FWD_VPORTS; i++) {
 			if (esw_attr->dests[i].termtbl)

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

@@ -219,7 +219,7 @@ mlx5_eswitch_termtbl_required(struct mlx5_eswitch *esw,
 
 	if (!MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, termination_table) ||
 	    !MLX5_CAP_ESW_FLOWTABLE_FDB(esw->dev, ignore_flow_level) ||
-	    attr->flags & MLX5_ESW_ATTR_FLAG_SLOW_PATH ||
+	    mlx5_esw_attr_flags_skip(attr->flags) ||
 	    !mlx5_eswitch_offload_is_uplink_port(esw, spec))
 		return false;