mtip_cmd_hdr
struct mtip_cmd_hdr *hdr =
dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
struct mtip_cmd_hdr *hdr =
dd->port->command_list + sizeof(struct mtip_cmd_hdr) * rq->tag;
#define AHCI_CMD_SLOT_SZ sizeof(struct mtip_cmd_hdr)