cpl_sge_egr_update
const struct cpl_sge_egr_update *p = (void *)rsp;
struct cpl_sge_egr_update *egr;
egr = (struct cpl_sge_egr_update *)rsp;
const struct cpl_sge_egr_update *p = (void *)(rsp + 3);
const struct cpl_sge_egr_update *p = cpl;