pf_frent_index
static inline int pf_frent_index(struct pf_frent *);
index = pf_frent_index(frent);
KASSERT(prev == NULL || pf_frent_index(prev) < index);
KASSERT(prev == NULL || pf_frent_index(prev) < index);
KASSERT(pf_frent_index(prev) == index);
index = pf_frent_index(frent);
if (pf_frent_index(next) == index) {
KASSERT(pf_frent_index(prev) == index);
for (index = pf_frent_index(frent); index < PF_FRAG_ENTRY_POINTS;