CISS_MAX_SG_ELEMENTS
cpi->maxio = (CISS_MAX_SG_ELEMENTS - 1) * PAGE_SIZE;
CISS_MAX_SG_ELEMENTS, /* nsegments */
MAXBSIZE, CISS_MAX_SG_ELEMENTS, /* maxsize, nsegments */
#define CISS_COMMAND_SG_LENGTH (sizeof(struct ciss_sg_entry) * CISS_MAX_SG_ELEMENTS)