skb_rx_info
BUILD_BUG_ON(sizeof(struct skb_rx_info) > sizeof(skb->cb));
struct skb_rx_info *skb_rx_info = (void *)skb->cb;
return skb_rx_info->rx_info.cid;
struct skb_rx_info *skb_rx_info = (void *)skb->cb;
skb_rx_info->rx_info.cid = cid;