Version of Solution Manager for upgrade to ECC 6.0

My client is upgrading to ECC 6.0. We are planning to use an existing instance of Solution Manager 3.x, but are unsure of whether we are on the right version to perform this activity. Can anyone tell me if I can use SM 3.x to upgrade to ECC 6.0? If I can use this SM version for an upgrade, what functionality can be used and what functionality will I be missing?