arp_hln
ah->arp_hln = sizeof (ah->arp_sha); /* hardware address length */
ah->arp_hln != sizeof (ah->arp_sha) ||
arp->arp_hln != sizeof (arp->arp_sha) ||
ap->arp_hln != sizeof(ap->arp_sha) ||
ap->arp_hln = sizeof(ap->arp_sha); /* hardware address length */
ap->arp_hln);
out->arp_ea.arp_hln = sizeof (ether_addr_t);
out->arp_ea.arp_hln = IPOIB_ADDRL;
ea->arp_hln = sizeof (ea->arp_sha); /* hardware address length */