net/mlx5e: Support MACsec offload replay window

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@nvidia.com>
Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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,
@@ -253,15 +284,18 @@ 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);
 	} else {
 		MLX5_SET64(macsec_offload_obj, obj, sci, (__force u64)(attrs->sci));
 	}
 
 	MLX5_SET(macsec_aso, aso_ctx, valid, 0x1);
-	if (is_tx)
+	if (is_tx) {
 		MLX5_SET(macsec_aso, aso_ctx, mode, MLX5_MACSEC_ASO_INC_SN);
+	} else {
+		err = macsec_set_replay_protection(attrs, aso_ctx);
+		if (err)
+			return err;
+	}
 
 	/* general object fields set */
 	MLX5_SET(general_obj_in_cmd_hdr, in, opcode, MLX5_CMD_OP_CREATE_GENERAL_OBJECT);
@@ -343,6 +377,8 @@ 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)
@@ -440,11 +476,6 @@ 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;
 }