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GSO/GRO offloads, with TCP+ECN and UDP support

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This commit is contained in:
JackDoan
2026-04-17 10:25:05 -05:00
parent f95857b4c3
commit 5d35351437
60 changed files with 6915 additions and 283 deletions
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30
udp/conn.go
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@@ -11,12 +11,25 @@ const MTU = 9001
// MaxWriteBatch is the largest batch any Conn.WriteBatch implementation is
// required to accept. Callers SHOULD NOT pass more than this per call; Linux
// backends preallocate sendmmsg scratch sized to this value, so exceeding it
// only costs a chunked retry.
// only costs additional sendmmsg chunks within a single WriteBatch call.
const MaxWriteBatch = 128
// RxMeta carries per-packet metadata extracted from the RX path (ancillary
// data, kernel offload state, etc.) and passed to EncReader callbacks.
// Backends that do not produce a particular signal leave its zero value.
//
// OuterECN is the 2-bit IP-level ECN codepoint stamped on the carrier
// datagram (extracted from IP_TOS / IPV6_TCLASS cmsg on Linux). Zero
// means Not-ECT, which is also the value backends without ECN RX support
// supply on every packet.
type RxMeta struct {
OuterECN byte
}
type EncReader func(
addr netip.AddrPort,
payload []byte,
meta RxMeta,
)
type Conn interface {
@@ -30,11 +43,14 @@ type Conn interface {
ListenOut(r EncReader, flush func()) error
WriteTo(b []byte, addr netip.AddrPort) error
// WriteBatch sends a contiguous batch of packets, each with its own
// destination. bufs and addrs must have the same length. Linux uses
// sendmmsg(2) for a single syscall; other backends fall back to a
// WriteTo loop. Returns on the first error; callers may observe a
// partial send if some packets went out before the error.
WriteBatch(bufs [][]byte, addrs []netip.AddrPort) error
// destination. bufs and addrs must have the same length. outerECNs may
// be nil (treated as all-zero / Not-ECT); when non-nil it must have the
// same length as bufs, and outerECNs[i] is the 2-bit IP-level ECN
// codepoint to set on packet i's outer header. Linux uses sendmmsg(2)
// for a single syscall and attaches the value as IP_TOS / IPV6_TCLASS
// cmsg; other backends ignore it. Returns on the first error; callers
// may observe a partial send if some packets went out before the error.
WriteBatch(bufs [][]byte, addrs []netip.AddrPort, outerECNs []byte) error
ReloadConfig(c *config.C)
SupportsMultipleReaders() bool
Close() error
@@ -57,7 +73,7 @@ func (NoopConn) SupportsMultipleReaders() bool {
func (NoopConn) WriteTo(_ []byte, _ netip.AddrPort) error {
return nil
}
func (NoopConn) WriteBatch(_ [][]byte, _ []netip.AddrPort) error {
func (NoopConn) WriteBatch(_ [][]byte, _ []netip.AddrPort, _ []byte) error {
return nil
}
func (NoopConn) ReloadConfig(_ *config.C) {