He had surgery after the season and expects to be fully recovered by the start of training camp next month.
"The good news is it's healed. It's close to 100 percent for what I want it to be," he said. "I feel good about it, feel confident about the season. I've never been injured like that. I didn't know anything with the rehab process, what to expect, what coming out of surgery would be like. It's all been really good."
Smith has always prided himself on his durability that allows him to play almost every snap at a physically grueling position where many players rotate in and out of the game to stay fresh.
He played more than 90 percent of San Francisco's defensive snaps last season before the injury, according to Pro Football Focus, and said he doesn't expect that to change even when he is 36-years old at the end of this contract.
"I won't be a guy who will be around for 10 snaps, 20 snaps," he said. "It's either I'm going or I'm not going. If it's time to get out of here, I'm going. I can get a ticket like everybody else. That's what I'll do."