CREATE TABLE table_56954 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Tyre" TEXT, "Driver" TEXT, "Rounds" TEXT)

Who constructed Gerhard Berger car that went all rounds?
SELECT "Constructor" FROM table_56954 WHERE "Rounds" = 'all' AND "Driver" = 'gerhard berger'
SELECT "Constructor" FROM "table_56954" WHERE "Driver" = 'gerhard berger' AND "Rounds" = 'all'