arp_hash
int hash = arp_hash(e->addr, e->ifindex, d);
hash = arp_hash(addr, ifidx, d);
int hash = arp_hash(addr, ifidx, d);
return addr_len == 4 ? arp_hash(d, addr, ifindex) :
static u32 arp_hash(const void *pkey, const struct net_device *dev, __u32 *hash_rnd);
.hash = arp_hash,