gfe-relnote: In QUIC, add probe timeout mode, which unifies TLP and RTO. Protected by gfe2_reloadable_flag_quic_enable_pto.
PTO mode is enabled on client side if gfe2_reloadable_flag_quic_enable_pto is true and client sends 1PTO or 2PTO. PTO mode is enabled on server side if gfe2_reloadable_flag_quic_enable_pto is true and server receives 1PTO or 2PTO from client.
Connection is closed after 7 or 8 PTO depending on connection option 7PTO or 8PTO, respectively.
PiperOrigin-RevId: 263574963
Change-Id: Id952a3e4640146c3fe72e3d6745cbac5ee16dcdc
diff --git a/quic/core/crypto/crypto_protocol.h b/quic/core/crypto/crypto_protocol.h
index bbd0b18..812aae0 100644
--- a/quic/core/crypto/crypto_protocol.h
+++ b/quic/core/crypto/crypto_protocol.h
@@ -170,6 +170,14 @@
const QuicTag kNSTP = TAG('N', 'S', 'T', 'P'); // No stop waiting frames.
const QuicTag kNRTT = TAG('N', 'R', 'T', 'T'); // Ignore initial RTT
+const QuicTag k1PTO = TAG('1', 'P', 'T', 'O'); // Send 1 packet upon PTO.
+const QuicTag k2PTO = TAG('2', 'P', 'T', 'O'); // Send 2 packets upon PTO.
+
+const QuicTag k7PTO = TAG('7', 'P', 'T', 'O'); // Closes connection on 7
+ // consecutive PTOs.
+const QuicTag k8PTO = TAG('8', 'P', 'T', 'O'); // Closes connection on 8
+ // consecutive PTOs.
+
// Optional support of truncated Connection IDs. If sent by a peer, the value
// is the minimum number of bytes allowed for the connection ID sent to the
// peer.
