netdev - [PATCH net-next 10/10] net/mlx5e: Support MACsec offload replay window

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Date:   Mon, 12 Sep 2022 00:40:59 +0100
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>,
        Emeel Hakim <ehakim@...dia.com>, Raed Salem <raeds@...dia.com>
Subject: [PATCH net-next 10/10] net/mlx5e: Support MACsec offload replay window

From: Emeel Hakim <ehakim@...dia.com>

Support setting replay window size for MACsec offload.
Currently supported window size of 32, 64, 128 and 256
bit. Other values will be returned as invalid parameter.

Reviewed-by: Raed Salem <raeds@...dia.com>
Signed-off-by: Emeel Hakim <ehakim@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../mellanox/mlx5/core/en_accel/macsec.c      | 46 ++++++++++++++++---
 1 file changed, 39 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
index 6f79f87b9930..166dc4e42d74 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
@@ -153,6 +153,8 @@ struct mlx5_macsec_obj_attrs {
 	struct mlx5e_macsec_epn_state epn_state;
 	salt_t salt;
 	__be32 ssci;
+	bool replay_protect;
+	u32 replay_window;
 };
 
 struct mlx5_aso_ctrl_param {
@@ -220,6 +222,35 @@ static void mlx5e_macsec_aso_dereg_mr(struct mlx5_core_dev *mdev, struct mlx5e_m
 	kfree(umr);
 }
 
+static int macsec_set_replay_protection(struct mlx5_macsec_obj_attrs *attrs, void *aso_ctx)
+{
+	u8 window_sz;
+
+	if (!attrs->replay_protect)
+		return 0;
+
+	switch (attrs->replay_window) {
+	case 256:
+		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_256BIT;
+		break;
+	case 128:
+		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_128BIT;
+		break;
+	case 64:
+		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_64BIT;
+		break;
+	case 32:
+		window_sz = MLX5_MACSEC_ASO_REPLAY_WIN_32BIT;
+		break;
+	default:
+		return -EINVAL;
+	}
+	MLX5_SET(macsec_aso, aso_ctx, window_size, window_sz);
+	MLX5_SET(macsec_aso, aso_ctx, mode, MLX5_MACSEC_ASO_REPLAY_PROTECTION);
+
+	return 0;
+}
+
 static int mlx5e_macsec_create_object(struct mlx5_core_dev *mdev,
 				      struct mlx5_macsec_obj_attrs *attrs,
 				      bool is_tx,
@@ -253,8 +284,12 @@ static int mlx5e_macsec_create_object(struct mlx5_core_dev *mdev,
 		salt_p = MLX5_ADDR_OF(macsec_offload_obj, obj, salt);
 		for (i = 0; i < 3 ; i++)
 			memcpy((u32 *)salt_p + i, &attrs->salt.bytes[4 * (2 - i)], 4);
-		if (!is_tx)
-			MLX5_SET(macsec_aso, aso_ctx, mode, MLX5_MACSEC_ASO_REPLAY_PROTECTION);
+
+		if (!is_tx) {
+			err = macsec_set_replay_protection(attrs, aso_ctx);
+			if (err)
+				return err;
+		}
 	} else {
 		MLX5_SET64(macsec_offload_obj, obj, sci, (__force u64)(attrs->sci));
 	}
@@ -343,6 +378,8 @@ static int mlx5e_macsec_init_sa(struct macsec_context *ctx,
 	}
 
 	memcpy(&obj_attrs.salt, &key->salt, sizeof(key->salt));
+	obj_attrs.replay_window = ctx->secy->replay_window;
+	obj_attrs.replay_protect = ctx->secy->replay_protect;
 
 	err = mlx5e_macsec_create_object(mdev, &obj_attrs, is_tx, &sa->macsec_obj_id);
 	if (err)
@@ -438,11 +475,6 @@ static bool mlx5e_macsec_secy_features_validate(struct macsec_context *ctx)
 		return false;
 	}
 
-	if (secy->replay_protect) {
-		netdev_err(netdev, "MACsec offload: replay protection is not supported\n");
-		return false;
-	}
-
 	return true;
 }
 
-- 
2.37.3