netdev - [net-next 17/17] net/mlx5: VLAN push on RX, pop on TX

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Date:   Mon, 10 Jan 2022 17:43:35 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Dima Chumak <dchumak@...dia.com>,
        Oz Shlomo <ozsh@...dia.com>, Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 17/17] net/mlx5: VLAN push on RX, pop on TX

From: Dima Chumak <dchumak@...dia.com>

Some older NIC hardware isn't capable of doing VLAN push on RX and pop
on TX.

A workaround has been added in software to support it, but it has a
performance penalty since it requires a hairpin + loopback.

There's no such limitation with the newer NICs, so no need to pay the
price of the w/a. With this change the software w/a is disabled for
certain HW versions and steering modes that support it.

Signed-off-by: Dima Chumak <dchumak@...dia.com>
Reviewed-by: Oz Shlomo <ozsh@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c
index 4b354aed784a..ee568bf34ae2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_termtbl.c
@@ -224,7 +224,9 @@ mlx5_eswitch_termtbl_required(struct mlx5_eswitch *esw,
 		return false;
 
 	/* push vlan on RX */
-	if (flow_act->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH)
+	if (flow_act->action & MLX5_FLOW_CONTEXT_ACTION_VLAN_PUSH &&
+	    !(mlx5_fs_get_capabilities(esw->dev, MLX5_FLOW_NAMESPACE_FDB) &
+	      MLX5_FLOW_STEERING_CAP_VLAN_PUSH_ON_RX))
 		return true;
 
 	/* hairpin */
-- 
2.34.1