pack packets into large buffers when GSO is available

send_conn.go

@@ -1,12 +1,15 @@
 package quic
 
 import (
+	"math"
 	"net"
+
+	"github.com/quic-go/quic-go/internal/protocol"
 )
 
 // A sendConn allows sending using a simple Write() on a non-connected packet conn.
 type sendConn interface {
-	Write([]byte) error
+	Write(b []byte, size protocol.ByteCount) error
 	Close() error
 	LocalAddr() net.Addr
 	RemoteAddr() net.Addr
@@ -40,8 +43,11 @@ func newSendConn(c rawConn, remote net.Addr, info *packetInfo) *sconn {
 	}
 }
 
-func (c *sconn) Write(p []byte) error {
-	_, err := c.WritePacket(p, c.remoteAddr, c.oob)
+func (c *sconn) Write(p []byte, size protocol.ByteCount) error {
+	if size > math.MaxUint16 {
+		panic("size overflow")
+	}
+	_, err := c.WritePacket(p, uint16(size), c.remoteAddr, c.oob)
 	return err
 }