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net/packet: remove {get,put}{16,32} indirection to encoding/binary.

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name              old time/op    new time/op    delta
Decode/tcp4-8       28.8ns ± 2%    13.1ns ± 4%  -54.44%  (p=0.008 n=5+5)
Decode/tcp6-8       20.6ns ± 1%    12.6ns ± 2%  -38.72%  (p=0.008 n=5+5)
Decode/udp4-8       28.2ns ± 1%    12.1ns ± 4%  -57.01%  (p=0.008 n=5+5)
Decode/udp6-8       20.0ns ± 6%    12.1ns ± 2%  -39.38%  (p=0.008 n=5+5)
Decode/icmp4-8      21.7ns ± 2%    11.5ns ± 1%  -47.01%  (p=0.008 n=5+5)
Decode/icmp6-8      14.1ns ± 2%    11.8ns ± 4%  -16.60%  (p=0.008 n=5+5)
Decode/unknown-8    9.43ns ± 2%    9.30ns ± 3%     ~     (p=0.222 n=5+5)

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-11-10 19:09:47 -08:00
committed by Dave Anderson
parent 55b1221db2
commit 22bf48f37c
4 changed files with 39 additions and 42 deletions
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12
net/packet/udp4.go
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@@ -4,6 +4,8 @@
package packet
import "encoding/binary"
// UDPHeader represents an UDP packet header.
type UDP4Header struct {
IP4Header
@@ -32,15 +34,15 @@ func (h UDP4Header) Marshal(buf []byte) error {
h.IPProto = UDP
length := len(buf) - h.IP4Header.Len()
put16(buf[20:22], h.SrcPort)
put16(buf[22:24], h.DstPort)
put16(buf[24:26], uint16(length))
put16(buf[26:28], 0) // blank checksum
binary.BigEndian.PutUint16(buf[20:22], h.SrcPort)
binary.BigEndian.PutUint16(buf[22:24], h.DstPort)
binary.BigEndian.PutUint16(buf[24:26], uint16(length))
binary.BigEndian.PutUint16(buf[26:28], 0) // blank checksum
h.IP4Header.MarshalPseudo(buf)
// UDP checksum with IP pseudo header.
put16(buf[26:28], ipChecksum(buf[8:]))
binary.BigEndian.PutUint16(buf[26:28], ipChecksum(buf[8:]))
h.IP4Header.Marshal(buf)