lsa_hash_hdr
head = &lsacache.hashtbl[lsa_hash_hdr(&ref->hdr) & lsacache.hashmask];
head = &lsacache.hashtbl[lsa_hash_hdr(lsa_hdr) & lsacache.hashmask];
head = &lsacache.hashtbl[lsa_hash_hdr(&ref->hdr) & lsacache.hashmask];
head = &lsacache.hashtbl[lsa_hash_hdr(lsa_hdr) & lsacache.hashmask];