net/mlx5e: Offload rule only when all encaps are valid

Bugzilla: https://bugzilla.redhat.com/2112947
Upstream-status: v6.1-rc7

commit f377422
Author: Chris Mi <cmi@nvidia.com>
Date:   Thu Nov 17 07:45:45 2022 +0200

    net/mlx5e: Offload rule only when all encaps are valid

    The cited commit adds a for loop to support multiple encapsulations.
    But it only checks if the last encap is valid.

    Fix it by setting slow path flag when one of the encap is invalid.

    Fixes: f493f15 ("net/mlx5e: Move flow attr reformat action bit to per dest flags")
    Signed-off-by: Chris Mi <cmi@nvidia.com>
    Reviewed-by: Roi Dayan <roid@nvidia.com>
    Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Signed-off-by: Mohammad Kabat <mkabat@redhat.com>

Author: Mohammad Kabat

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.c

@@ -764,8 +764,7 @@ int mlx5e_attach_encap(struct mlx5e_priv *priv,
 		       struct net_device *mirred_dev,
 		       int out_index,
 		       struct netlink_ext_ack *extack,
-		       struct net_device **encap_dev,
-		       bool *encap_valid)
+		       struct net_device **encap_dev)
 {
 	struct mlx5_eswitch *esw = priv->mdev->priv.eswitch;
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
@@ -880,9 +879,8 @@ int mlx5e_attach_encap(struct mlx5e_priv *priv,
 	if (e->flags & MLX5_ENCAP_ENTRY_VALID) {
 		attr->esw_attr->dests[out_index].pkt_reformat = e->pkt_reformat;
 		attr->esw_attr->dests[out_index].flags |= MLX5_ESW_DEST_ENCAP_VALID;
-		*encap_valid = true;
 	} else {
-		*encap_valid = false;
+		flow_flag_set(flow, SLOW);
 	}
 	mutex_unlock(&esw->offloads.encap_tbl_lock);
 

drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun_encap.h

@@ -17,8 +17,7 @@ int mlx5e_attach_encap(struct mlx5e_priv *priv,
 		       struct net_device *mirred_dev,
 		       int out_index,
 		       struct netlink_ext_ack *extack,
-		       struct net_device **encap_dev,
-		       bool *encap_valid);
+		       struct net_device **encap_dev);
 
 int mlx5e_attach_decap(struct mlx5e_priv *priv,
 		       struct mlx5e_tc_flow *flow,

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

@@ -1620,7 +1620,6 @@ set_encap_dests(struct mlx5e_priv *priv,
 		struct mlx5e_tc_flow *flow,
 		struct mlx5_flow_attr *attr,
 		struct netlink_ext_ack *extack,
-		bool *encap_valid,
 		bool *vf_tun)
 {
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
@@ -1637,7 +1636,6 @@ set_encap_dests(struct mlx5e_priv *priv,
 	parse_attr = attr->parse_attr;
 	esw_attr = attr->esw_attr;
 	*vf_tun = false;
-	*encap_valid = true;
 
 	for (out_index = 0; out_index < MLX5_MAX_FLOW_FWD_VPORTS; out_index++) {
 		struct net_device *out_dev;
@@ -1654,7 +1652,7 @@ set_encap_dests(struct mlx5e_priv *priv,
 			goto out;
 		}
 		err = mlx5e_attach_encap(priv, flow, attr, out_dev, out_index,
-					 extack, &encap_dev, encap_valid);
+					 extack, &encap_dev);
 		dev_put(out_dev);
 		if (err)
 			goto out;
@@ -1718,8 +1716,8 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 	struct mlx5e_tc_flow_parse_attr *parse_attr;
 	struct mlx5_flow_attr *attr = flow->attr;
 	struct mlx5_esw_flow_attr *esw_attr;
-	bool vf_tun, encap_valid;
 	u32 max_prio, max_chain;
+	bool vf_tun;
 	int err = 0;
 
 	parse_attr = attr->parse_attr;
@@ -1809,7 +1807,7 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 		esw_attr->int_port = int_port;
 	}
 
-	err = set_encap_dests(priv, flow, attr, extack, &encap_valid, &vf_tun);
+	err = set_encap_dests(priv, flow, attr, extack, &vf_tun);
 	if (err)
 		goto err_out;
 
@@ -1839,7 +1837,7 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 	 * (1) there's no error
 	 * (2) there's an encap action and we don't have valid neigh
 	 */
-	if (!encap_valid || flow_flag_test(flow, SLOW))
+	if (flow_flag_test(flow, SLOW))
 		flow->rule[0] = mlx5e_tc_offload_to_slow_path(esw, flow, &parse_attr->spec);
 	else
 		flow->rule[0] = mlx5e_tc_offload_fdb_rules(esw, flow, &parse_attr->spec, attr);
@@ -3741,7 +3739,7 @@ alloc_flow_post_acts(struct mlx5e_tc_flow *flow, struct netlink_ext_ack *extack)
 	struct mlx5e_post_act *post_act = get_post_action(flow->priv);
 	struct mlx5_flow_attr *attr, *next_attr = NULL;
 	struct mlx5e_post_act_handle *handle;
-	bool vf_tun, encap_valid = true;
+	bool vf_tun;
 	int err;
 
 	/* This is going in reverse order as needed.
@@ -3763,13 +3761,10 @@ alloc_flow_post_acts(struct mlx5e_tc_flow *flow, struct netlink_ext_ack *extack)
 		if (list_is_last(&attr->list, &flow->attrs))
 			break;
 
-		err = set_encap_dests(flow->priv, flow, attr, extack, &encap_valid, &vf_tun);
+		err = set_encap_dests(flow->priv, flow, attr, extack, &vf_tun);
 		if (err)
 			goto out_free;
 
-		if (!encap_valid)
-			flow_flag_set(flow, SLOW);
-
 		err = actions_prepare_mod_hdr_actions(flow->priv, flow, attr, extack);
 		if (err)
 			goto out_free;