net/mlx5e: Store replay window in XFRM attributes

As a preparation for future extension of IPsec hardware object to allow
configuration of packet offload mode, extend the XFRM validator to check
replay window values.
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -166,6 +166,7 @@ mlx5e_ipsec_build_accel_xfrm_attrs(struct mlx5e_ipsec_sa_entry *sa_entry,
 		attrs->esn = sa_entry->esn_state.esn;
 		if (sa_entry->esn_state.overlap)
 			attrs->flags |= MLX5_ACCEL_ESP_FLAGS_ESN_STATE_OVERLAP;
+		attrs->replay_window = x->replay_esn->replay_window;
 	}
 
 	/* action */
@@ -257,6 +258,17 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 		netdev_info(netdev, "Unsupported xfrm offload type\n");
 		return -EINVAL;
 	}
+	if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) {
+		if (x->replay_esn && x->replay_esn->replay_window != 32 &&
+		    x->replay_esn->replay_window != 64 &&
+		    x->replay_esn->replay_window != 128 &&
+		    x->replay_esn->replay_window != 256) {
+			netdev_info(netdev,
+				    "Unsupported replay window size %u\n",
+				    x->replay_esn->replay_window);
+			return -EINVAL;
+		}
+	}
 	return 0;
 }
 

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -83,6 +83,7 @@ struct mlx5_accel_esp_xfrm_attrs {
 	} daddr;
 
 	u8 is_ipv6;
+	u32 replay_window;
 };
 
 enum mlx5_ipsec_cap {