linux-kernel - [PATCH 5.16 14/43] net/mlx5e: TC, Reject rules with drop and modify hdr action

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Message-Id: <20220204091917.640709686@linuxfoundation.org>
Date:   Fri,  4 Feb 2022 10:22:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Roi Dayan <roid@...dia.com>,
        Oz Shlomo <ozsh@...dia.com>, Maor Dickman <maord@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH 5.16 14/43] net/mlx5e: TC, Reject rules with drop and modify hdr action

From: Roi Dayan <roid@...dia.com>

commit a2446bc77a16cefd27de712d28af2396d6287593 upstream.

This kind of action is not supported by firmware and generates a
syndrome.

kernel: mlx5_core 0000:08:00.0: mlx5_cmd_check:777:(pid 102063): SET_FLOW_TABLE_ENTRY(0x936) op_mod(0x0) failed, status bad parameter(0x3), syndrome (0x8708c3)

Fixes: d7e75a325cb2 ("net/mlx5e: Add offloading of E-Switch TC pedit (header re-write) actions")
Signed-off-by: Roi Dayan <roid@...dia.com>
Reviewed-by: Oz Shlomo <ozsh@...dia.com>
Reviewed-by: Maor Dickman <maord@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3421,6 +3421,12 @@ actions_match_supported(struct mlx5e_pri
 	}
 
 	if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR &&
+	    actions & MLX5_FLOW_CONTEXT_ACTION_DROP) {
+		NL_SET_ERR_MSG_MOD(extack, "Drop with modify header action is not supported");
+		return false;
+	}
+
+	if (actions & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR &&
 	    !modify_header_match_supported(priv, &parse_attr->spec, flow_action,
 					   actions, ct_flow, ct_clear, extack))
 		return false;