arp: increment lru when inserting a new entry
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@ -97,6 +97,7 @@ impl<'a> Cache for SliceCache<'a> {
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fn fill(&mut self, protocol_addr: &IpAddress, hardware_addr: &EthernetAddress) {
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if let None = self.find(protocol_addr) {
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let lru_index = self.lru();
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self.counter += 1;
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self.storage[lru_index] =
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(*protocol_addr, *hardware_addr, self.counter);
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self.sort()
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