netdev - [net-next 09/15] net/mlx5e: TC, Remove mirror and ct limitation

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Date:   Wed,  5 Apr 2023 19:02:26 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Paul Blakey <paulb@...dia.com>, Roi Dayan <roid@...dia.com>
Subject: [net-next 09/15] net/mlx5e: TC, Remove mirror and ct limitation

From: Paul Blakey <paulb@...dia.com>

Mirror action before a ct nat action was not supported when only
chain was restored on misses. As to work around that limitation,
ct action was reordered to be first (so if hw misses on ct
action, packet wasn't modified). This reordering wasn't possible
if there was mirror action before the ct nat action, as we had to
mirror the packet before the nat operation.

Now that the misses continue from the relevant tc ct action
in software and ct action is no longer reordered, this case
is supported.

Remove this limitation.

Signed-off-by: Paul Blakey <paulb@...dia.com>
Reviewed-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index b6469abc7012..728b82ce4031 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -3507,19 +3507,6 @@ actions_match_supported_fdb(struct mlx5e_priv *priv,
 			    struct netlink_ext_ack *extack)
 {
 	struct mlx5_esw_flow_attr *esw_attr = flow->attr->esw_attr;
-	bool ct_flow, ct_clear;
-
-	ct_clear = flow->attr->ct_attr.ct_action & TCA_CT_ACT_CLEAR;
-	ct_flow = flow_flag_test(flow, CT) && !ct_clear;
-
-	if (esw_attr->split_count && ct_flow &&
-	    !MLX5_CAP_GEN(esw_attr->in_mdev, reg_c_preserve)) {
-		/* All registers used by ct are cleared when using
-		 * split rules.
-		 */
-		NL_SET_ERR_MSG_MOD(extack, "Can't offload mirroring with action ct");
-		return false;
-	}
 
 	if (esw_attr->split_count > 0 && !mlx5_esw_has_fwd_fdb(priv->mdev)) {
 		NL_SET_ERR_MSG_MOD(extack,
-- 
2.39.2