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wgengine/magicsock: remove an allocation in ReceiveIPv4

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Depends on a corresponding package net change.

Incomplete! We appear to need the original net.UDPAddr
in the legacy code path for non-obvious reasons.

Before:

BenchmarkReceiveFrom-8   	   72898	     16888 ns/op	     112 B/op	       3 allocs/op

After:

BenchmarkReceiveFrom-8   	   72432	     16719 ns/op	      64 B/op	       2 allocs/op

Co-authored-by: Sonia Appasamy <sonia@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder 2021-02-11 11:56:54 -08:00
parent 851366432a
commit ab72ede692
1 changed files with 24 additions and 10 deletions
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34
wgengine/magicsock/magicsock.go
View File

@ -1590,7 +1590,12 @@ func (c *Conn) ReceiveIPv6(b []byte) (int, conn.Endpoint, error) {
if err != nil {
return 0, nil, err
}
if ep, ok := c.receiveIP(b[:n], pAddr.(*net.UDPAddr), &c.ippEndpoint6); ok {
udpAddr := pAddr.(*net.UDPAddr)
ipp, ok := netaddr.FromStdAddr(udpAddr.IP, udpAddr.Port, udpAddr.Zone)
if !ok {
continue
}
if ep, ok := c.receiveIP(b[:n], ipp, &c.ippEndpoint6); ok {
return n, ep, nil
}
}
@ -1604,13 +1609,23 @@ func (c *Conn) derpPacketArrived() bool {
// In Tailscale's case, that packet might also arrive via DERP. A DERP packet arrival
// aborts the pconn4 read deadline to make it fail.
func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
var pAddr net.Addr
var ipp netaddr.IPPort
var ippOK bool
for {
// Drain DERP queues before reading new UDP packets.
if c.derpPacketArrived() {
goto ReadDERP
}
n, pAddr, err = c.pconn4.ReadFrom(b)
if udpConn, ok := c.pconn4.pconn.(*net.UDPConn); ok {
var pAddr *net.UDPAddr
n, pAddr, err = udpConn.ReadFromUDP(b)
ipp, ippOK = netaddr.FromStdAddr(pAddr.IP, pAddr.Port, pAddr.Zone)
} else {
var addr net.Addr
n, addr, err = c.pconn4.ReadFrom(b)
pAddr, _ := addr.(*net.UDPAddr)
ipp, ippOK = netaddr.FromStdAddr(pAddr.IP, pAddr.Port, pAddr.Zone)
}
if err != nil {
// If the pconn4 read failed, the likely reason is a DERP reader received
// a packet and interrupted us.
@ -1622,7 +1637,10 @@ func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
}
return 0, nil, err
}
if ep, ok := c.receiveIP(b[:n], pAddr.(*net.UDPAddr), &c.ippEndpoint4); ok {
if !ippOK {
continue
}
if ep, ok := c.receiveIP(b[:n], ipp, &c.ippEndpoint4); ok {
return n, ep, nil
} else {
continue
@ -1640,11 +1658,7 @@ func (c *Conn) ReceiveIPv4(b []byte) (n int, ep conn.Endpoint, err error) {
//
// ok is whether this read should be reported up to wireguard-go (our
// caller).
func (c *Conn) receiveIP(b []byte, ua *net.UDPAddr, cache *ippEndpointCache) (ep conn.Endpoint, ok bool) {
ipp, ok := netaddr.FromStdAddr(ua.IP, ua.Port, ua.Zone)
if !ok {
return nil, false
}
func (c *Conn) receiveIP(b []byte, ipp netaddr.IPPort, cache *ippEndpointCache) (ep conn.Endpoint, ok bool) {
if stun.Is(b) {
c.stunReceiveFunc.Load().(func([]byte, netaddr.IPPort))(b, ipp)
return nil, false
@ -1662,7 +1676,7 @@ func (c *Conn) receiveIP(b []byte, ua *net.UDPAddr, cache *ippEndpointCache) (ep
if cache.ipp == ipp && cache.de != nil && cache.gen == cache.de.numStopAndReset() {
ep = cache.de
} else {
ep = c.findEndpoint(ipp, ua, b)
ep = c.findEndpoint(ipp, nil, b) // TODO: ua instead of nil. because...reasons.
if ep == nil {
return nil, false
}