sf_pkt
struct sf_pkt *sft_pkt_head; /* queue of active commands */
struct sf_pkt *sft_pkt_tail;
#define PKT2CMD(pkt) ((struct sf_pkt *)pkt->pkt_ha_private)
struct sf_pkt *cmd_forw;
struct sf_pkt *cmd_back;
struct sf_pkt *cmd_next;
struct sf_pkt *sf_pkt_head; /* packet queue */
struct sf_pkt *sf_pkt_tail;