gfe-relnote: Implement QUIC MTU discovery v2. Protected by --gfe2_reloadable_flag_quic_mtu_discovery_v2.
PiperOrigin-RevId: 274290098
Change-Id: I6a55ff6aced1702fd42841f9a130f4d84076c3ec
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index bb4464b..3d07946 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -34,6 +34,7 @@
#include "net/third_party/quiche/src/quic/core/quic_connection_id.h"
#include "net/third_party/quiche/src/quic/core/quic_connection_stats.h"
#include "net/third_party/quiche/src/quic/core/quic_framer.h"
+#include "net/third_party/quiche/src/quic/core/quic_mtu_discovery.h"
#include "net/third_party/quiche/src/quic/core/quic_one_block_arena.h"
#include "net/third_party/quiche/src/quic/core/quic_packet_creator.h"
#include "net/third_party/quiche/src/quic/core/quic_packet_generator.h"
@@ -59,35 +60,6 @@
class QuicConnectionPeer;
} // namespace test
-// The initial number of packets between MTU probes. After each attempt the
-// number is doubled.
-const QuicPacketCount kPacketsBetweenMtuProbesBase = 100;
-
-// The number of MTU probes that get sent before giving up.
-const size_t kMtuDiscoveryAttempts = 3;
-
-// Ensure that exponential back-off does not result in an integer overflow.
-// The number of packets can be potentially capped, but that is not useful at
-// current kMtuDiscoveryAttempts value, and hence is not implemented at present.
-static_assert(kMtuDiscoveryAttempts + 8 < 8 * sizeof(QuicPacketNumber),
- "The number of MTU discovery attempts is too high");
-static_assert(kPacketsBetweenMtuProbesBase < (1 << 8),
- "The initial number of packets between MTU probes is too high");
-
-// The incresed packet size targeted when doing path MTU discovery.
-const QuicByteCount kMtuDiscoveryTargetPacketSizeHigh = 1450;
-const QuicByteCount kMtuDiscoveryTargetPacketSizeLow = 1430;
-
-static_assert(kMtuDiscoveryTargetPacketSizeLow <= kMaxOutgoingPacketSize,
- "MTU discovery target is too large");
-static_assert(kMtuDiscoveryTargetPacketSizeHigh <= kMaxOutgoingPacketSize,
- "MTU discovery target is too large");
-
-static_assert(kMtuDiscoveryTargetPacketSizeLow > kDefaultMaxPacketSize,
- "MTU discovery target does not exceed the default packet size");
-static_assert(kMtuDiscoveryTargetPacketSizeHigh > kDefaultMaxPacketSize,
- "MTU discovery target does not exceed the default packet size");
-
// Class that receives callbacks from the connection when frames are received
// and when other interesting events happen.
class QUIC_EXPORT_PRIVATE QuicConnectionVisitorInterface {
@@ -1541,6 +1513,11 @@
// Latched value of quic_treat_queued_packets_as_sent.
const bool treat_queued_packets_as_sent_;
+
+ // Latched value of quic_mtu_discovery_v2.
+ const bool mtu_discovery_v2_;
+ // Only used if quic_mtu_discovery_v2 is true.
+ QuicConnectionMtuDiscoverer mtu_discoverer_;
};
} // namespace quic
