1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/csum.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/csum.c
new file mode 100644
index 000000000000..c0f08ae6a57f
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/csum.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+// Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+#include <linux/tc_act/tc_csum.h>
+#include "act.h"
+#include "en/tc_priv.h"
+
+static bool
+csum_offload_supported(struct mlx5e_priv *priv,
+		       u32 action,
+		       u32 update_flags,
+		       struct netlink_ext_ack *extack)
+{
+	u32 prot_flags = TCA_CSUM_UPDATE_FLAG_IPV4HDR | TCA_CSUM_UPDATE_FLAG_TCP |
+			 TCA_CSUM_UPDATE_FLAG_UDP;
+
+	/*  The HW recalcs checksums only if re-writing headers */
+	if (!(action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "TC csum action is only offloaded with pedit");
+		netdev_warn(priv->netdev,
+			    "TC csum action is only offloaded with pedit\n");
+		return false;
+	}
+
+	if (update_flags & ~prot_flags) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "can't offload TC csum action for some header/s");
+		netdev_warn(priv->netdev,
+			    "can't offload TC csum action for some header/s - flags %#x\n",
+			    update_flags);
+		return false;
+	}
+
+	return true;
+}
+
+static bool
+tc_act_can_offload_csum(struct mlx5e_tc_act_parse_state *parse_state,
+			const struct flow_action_entry *act,
+			int act_index,
+			struct mlx5_flow_attr *attr)
+{
+	struct mlx5e_tc_flow *flow = parse_state->flow;
+
+	return csum_offload_supported(flow->priv, attr->action,
+				      act->csum_flags, parse_state->extack);
+}
+
+static int
+tc_act_parse_csum(struct mlx5e_tc_act_parse_state *parse_state,
+		  const struct flow_action_entry *act,
+		  struct mlx5e_priv *priv,
+		  struct mlx5_flow_attr *attr)
+{
+	return 0;
+}
+
+struct mlx5e_tc_act mlx5e_tc_act_csum = {
+	.can_offload = tc_act_can_offload_csum,
+	.parse_action = tc_act_parse_csum,
+};