Smith (6-foot-5, 310 pounds) was a second-round draft choice of Jacksonville out of Florida State in 1999. He has played in 51 games for the Jaguars over four seasons, with seven starts.
Smith, 28, started the first three games for the Jaguars and had a career-high six tackles in his third start. But he suffered ankle injury and lost his starting job to rookie John Henderson. Smith finished last year with 36 tackles and one quarterback sack.
The Packers signed Smith after Detroit signed free agent Dan Wilkinson to a four-year contract. The Packers had been pursuing Wilkinson, who recently was released by the Washington Redskins.
To make room for Smith, the Packers placed defensive back Bryant Westbrook on season-ending injured reserve.