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device: use linked list for per-peer allowed-ip traversal

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This makes the IpcGet method much faster.

We also refactor the traversal API to use a callback so that we don't
need to allocate at all. Avoiding allocations we do self-masking on
insertion, which in turn means that split intermediate nodes require a
copy of the bits.

benchmark               old ns/op     new ns/op     delta
BenchmarkUAPIGet-16     3243          2659          -18.01%

benchmark               old allocs     new allocs     delta
BenchmarkUAPIGet-16     35             30             -14.29%

benchmark               old bytes     new bytes     delta
BenchmarkUAPIGet-16     1218          737           -39.49%

This benchmark is good, though it's only for a pair of peers, each with
only one allowedips. As this grows, the delta expands considerably.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld
2021-01-26 23:44:37 +01:00
parent d669c78c43
commit 8cc99631d0
4 changed files with 62 additions and 44 deletions
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7
device/uapi.go
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@@ -108,9 +108,10 @@ func (device *Device) IpcGetOperation(w io.Writer) error {
sendf("rx_bytes=%d", atomic.LoadUint64(&peer.stats.rxBytes))
sendf("persistent_keepalive_interval=%d", atomic.LoadUint32(&peer.persistentKeepaliveInterval))
for _, ip := range device.allowedips.EntriesForPeer(peer) {
sendf("allowed_ip=%s", ip.String())
}
device.allowedips.EntriesForPeer(peer, func(ip net.IP, cidr uint) bool {
sendf("allowed_ip=%s/%d", ip.String(), cidr)
return true
})
}
}()