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This significantly improves throughput of a peer relay server on Linux. Server.packetReadLoop no longer passes sockets down the stack. Instead, packet handling methods return a netip.AddrPort and []byte, which packetReadLoop gathers together for eventual batched writes on the appropriate socket(s). Updates tailscale/corp#31164 Signed-off-by: Jordan Whited <jordan@tailscale.com>
48 lines
1.7 KiB
Go
48 lines
1.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package batching implements a socket optimized for increased throughput.
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package batching
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import (
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"net/netip"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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"tailscale.com/net/packet"
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"tailscale.com/types/nettype"
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)
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var (
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// This acts as a compile-time check for our usage of ipv6.Message in
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// [Conn] for both IPv6 and IPv4 operations.
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_ ipv6.Message = ipv4.Message{}
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)
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// Conn is a nettype.PacketConn that provides batched i/o using
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// platform-specific optimizations, e.g. {recv,send}mmsg & UDP GSO/GRO.
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//
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// Conn originated from (and is still used by) magicsock where its API was
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// strongly influenced by [wireguard-go/conn.Bind] constraints, namely
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// wireguard-go's ownership of packet memory.
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type Conn interface {
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nettype.PacketConn
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// ReadBatch reads messages from [Conn] into msgs. It returns the number of
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// messages the caller should evaluate for nonzero len, as a zero len
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// message may fall on either side of a nonzero.
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//
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// Each [ipv6.Message.OOB] must be sized to at least MinControlMessageSize().
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ReadBatch(msgs []ipv6.Message, flags int) (n int, err error)
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// WriteBatchTo writes buffs to addr.
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//
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// If geneve.VNI.IsSet(), then geneve is encoded into the space preceding
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// offset, and offset must equal [packet.GeneveFixedHeaderLength]. If
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// !geneve.VNI.IsSet() then the space preceding offset is ignored.
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//
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// len(buffs) must be <= batchSize supplied in TryUpgradeToConn().
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//
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// WriteBatchTo may return a [neterror.ErrUDPGSODisabled] error if UDP GSO
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// was disabled as a result of a send error.
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WriteBatchTo(buffs [][]byte, addr netip.AddrPort, geneve packet.GeneveHeader, offset int) error
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}
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