net/mlx5e: Open mlx5 driver to accept IPsec packet offload

Enable configuration of IPsec packet offload through XFRM state add
interface together with moving specific to IPsec packet mode limitations
to specific switch-case section.
Reviewed-by: Raed Salem <raeds@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

@@ -191,11 +191,6 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 		netdev_info(netdev, "Only IPv4/6 xfrm states may be offloaded\n");
 		return -EINVAL;
 	}
-	if (x->props.mode != XFRM_MODE_TRANSPORT &&
-	    x->props.mode != XFRM_MODE_TUNNEL) {
-		dev_info(&netdev->dev, "Only transport and tunnel xfrm states may be offloaded\n");
-		return -EINVAL;
-	}
 	if (x->id.proto != IPPROTO_ESP) {
 		netdev_info(netdev, "Only ESP xfrm state may be offloaded\n");
 		return -EINVAL;
@@ -229,11 +224,32 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 		netdev_info(netdev, "Cannot offload xfrm states with geniv other than seqiv\n");
 		return -EINVAL;
 	}
-	if (x->xso.type != XFRM_DEV_OFFLOAD_CRYPTO) {
-		netdev_info(netdev, "Unsupported xfrm offload type\n");
+	switch (x->xso.type) {
+	case XFRM_DEV_OFFLOAD_CRYPTO:
+		if (!(mlx5_ipsec_device_caps(priv->mdev) &
+		      MLX5_IPSEC_CAP_CRYPTO)) {
+			netdev_info(netdev, "Crypto offload is not supported\n");
 			return -EINVAL;
 		}
-	if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET) {
+
+		if (x->props.mode != XFRM_MODE_TRANSPORT &&
+		    x->props.mode != XFRM_MODE_TUNNEL) {
+			netdev_info(netdev, "Only transport and tunnel xfrm states may be offloaded\n");
+			return -EINVAL;
+		}
+		break;
+	case XFRM_DEV_OFFLOAD_PACKET:
+		if (!(mlx5_ipsec_device_caps(priv->mdev) &
+		      MLX5_IPSEC_CAP_PACKET_OFFLOAD)) {
+			netdev_info(netdev, "Packet offload is not supported\n");
+			return -EINVAL;
+		}
+
+		if (x->props.mode != XFRM_MODE_TRANSPORT) {
+			netdev_info(netdev, "Only transport xfrm states may be offloaded in packet mode\n");
+			return -EINVAL;
+		}
+
 		if (x->replay_esn && x->replay_esn->replay_window != 32 &&
 		    x->replay_esn->replay_window != 64 &&
 		    x->replay_esn->replay_window != 128 &&
@@ -263,6 +279,11 @@ static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
 				    "Hard packet limit must be greater than soft one\n");
 			return -EINVAL;
 		}
+		break;
+	default:
+		netdev_info(netdev, "Unsupported xfrm offload type %d\n",
+			    x->xso.type);
+		return -EINVAL;
 	}
 	return 0;
 }