netdev - [PATCH AUTOSEL 5.10 037/137] net/mlx5e: IPsec/rep_tc: Fix rep_tc_update

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Date:   Tue,  6 Jul 2021 07:20:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Huy Nguyen <huyn@...dia.com>, Raed Salem <raeds@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 037/137] net/mlx5e: IPsec/rep_tc: Fix rep_tc_update_skb drops IPsec packet

From: Huy Nguyen <huyn@...dia.com>

[ Upstream commit c07274ab1ab2c38fb128e32643c22c89cb319384 ]

rep_tc copy REG_C1 to REG_B. IPsec crypto utilizes the whole REG_B
register with BIT31 as IPsec marker. rep_tc_update_skb drops
IPsec because it thought REG_B contains bad value.

In previous patch, BIT 31 of REG_C1 is reserved for IPsec.
Skip the rep_tc_update_skb if BIT31 of REG_B is set.

Signed-off-by: Huy Nguyen <huyn@...dia.com>
Signed-off-by: Raed Salem <raeds@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 7e1f8660dfec..f327b78261ec 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1318,7 +1318,8 @@ static void mlx5e_handle_rx_cqe_rep(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe)
 	if (rep->vlan && skb_vlan_tag_present(skb))
 		skb_vlan_pop(skb);
 
-	if (!mlx5e_rep_tc_update_skb(cqe, skb, &tc_priv)) {
+	if (unlikely(!mlx5_ipsec_is_rx_flow(cqe) &&
+		     !mlx5e_rep_tc_update_skb(cqe, skb, &tc_priv))) {
 		dev_kfree_skb_any(skb);
 		goto free_wqe;
 	}
@@ -1375,7 +1376,8 @@ static void mlx5e_handle_rx_cqe_mpwrq_rep(struct mlx5e_rq *rq, struct mlx5_cqe64
 
 	mlx5e_complete_rx_cqe(rq, cqe, cqe_bcnt, skb);
 
-	if (!mlx5e_rep_tc_update_skb(cqe, skb, &tc_priv)) {
+	if (unlikely(!mlx5_ipsec_is_rx_flow(cqe) &&
+		     !mlx5e_rep_tc_update_skb(cqe, skb, &tc_priv))) {
 		dev_kfree_skb_any(skb);
 		goto mpwrq_cqe_out;
 	}
-- 
2.30.2