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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Huy Nguyen <huyn@nvidia.com>,
        Raed Salem <raeds@nvidia.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 037/242] net/mlx5e: IPsec/rep_tc: Fix rep_tc_update_skb drops IPsec packet
Date:   Thu, 15 Jul 2021 20:36:39 +0200
Message-Id: <20210715182558.529346941@linuxfoundation.org>
In-Reply-To: <20210715182551.731989182@linuxfoundation.org>
References: <20210715182551.731989182@linuxfoundation.org>
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From: Huy Nguyen <huyn@nvidia.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@nvidia.com>
Signed-off-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 249d8905e644..e7528fa7e187 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1308,7 +1308,8 @@ 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;
 	}
@@ -1365,7 +1366,8 @@ 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