1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/goto.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/goto.c
new file mode 100644
index 000000000000..25174f68613e
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/goto.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include "act.h"
+#include "en/tc_priv.h"
+#include "eswitch.h"
+
+static int
+validate_goto_chain(struct mlx5e_priv *priv,
+		    struct mlx5e_tc_flow *flow,
+		    struct mlx5_flow_attr *attr,
+		    const struct flow_action_entry *act,
+		    struct netlink_ext_ack *extack)
+{
+	struct mlx5e_tc_table *tc = mlx5e_fs_get_tc(priv->fs);
+	bool is_esw = mlx5e_is_eswitch_flow(flow);
+	bool ft_flow = mlx5e_is_ft_flow(flow);
+	u32 dest_chain = act->chain_index;
+	struct mlx5_fs_chains *chains;
+	struct mlx5_eswitch *esw;
+	u32 reformat_and_fwd;
+	u32 max_chain;
+
+	esw = priv->mdev->priv.eswitch;
+	chains = is_esw ? esw_chains(esw) : mlx5e_nic_chains(tc);
+	max_chain = mlx5_chains_get_chain_range(chains);
+	reformat_and_fwd = is_esw ?
+			   MLX5_CAP_ESW_FLOWTABLE_FDB(priv->mdev, reformat_and_fwd_to_table) :
+			   MLX5_CAP_FLOWTABLE_NIC_RX(priv->mdev, reformat_and_fwd_to_table);
+
+	if (ft_flow) {
+		NL_SET_ERR_MSG_MOD(extack, "Goto action is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!mlx5_chains_backwards_supported(chains) &&
+	    dest_chain <= attr->chain) {
+		NL_SET_ERR_MSG_MOD(extack, "Goto lower numbered chain isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (dest_chain > max_chain) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Requested destination chain is out of supported range");
+		return -EOPNOTSUPP;
+	}
+
+	if (attr->action & (MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT |
+			    MLX5_FLOW_CONTEXT_ACTION_DECAP) &&
+	    !reformat_and_fwd) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Goto chain is not allowed if action has reformat or decap");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static bool
+tc_act_can_offload_goto(struct mlx5e_tc_act_parse_state *parse_state,
+			const struct flow_action_entry *act,
+			int act_index,
+			struct mlx5_flow_attr *attr)
+{
+	struct netlink_ext_ack *extack = parse_state->extack;
+	struct mlx5e_tc_flow *flow = parse_state->flow;
+
+	if (validate_goto_chain(flow->priv, flow, attr, act, extack))
+		return false;
+
+	return true;
+}
+
+static int
+tc_act_parse_goto(struct mlx5e_tc_act_parse_state *parse_state,
+		  const struct flow_action_entry *act,
+		  struct mlx5e_priv *priv,
+		  struct mlx5_flow_attr *attr)
+{
+	attr->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+	attr->dest_chain = act->chain_index;
+
+	return 0;
+}
+
+static int
+tc_act_post_parse_goto(struct mlx5e_tc_act_parse_state *parse_state,
+		       struct mlx5e_priv *priv,
+		       struct mlx5_flow_attr *attr)
+{
+	struct mlx5e_tc_flow_parse_attr *parse_attr = attr->parse_attr;
+	struct netlink_ext_ack *extack = parse_state->extack;
+	struct mlx5e_tc_flow *flow = parse_state->flow;
+
+	if (!attr->dest_chain)
+		return 0;
+
+	if (parse_state->decap) {
+		/* It can be supported if we'll create a mapping for
+		 * the tunnel device only (without tunnel), and set
+		 * this tunnel id with this decap flow.
+		 *
+		 * On restore (miss), we'll just set this saved tunnel
+		 * device.
+		 */
+
+		NL_SET_ERR_MSG_MOD(extack, "Decap with goto isn't supported");
+		netdev_warn(priv->netdev, "Decap with goto isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!mlx5e_is_eswitch_flow(flow) && parse_attr->mirred_ifindex[0]) {
+		NL_SET_ERR_MSG_MOD(extack, "Mirroring goto chain rules isn't supported");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_goto = {
+	.can_offload = tc_act_can_offload_goto,
+	.parse_action = tc_act_parse_goto,
+	.post_parse = tc_act_post_parse_goto,
+};