1 files changed, 85 insertions, 0 deletions
diff --git a/lib/ngtcp2_rst.h b/lib/ngtcp2_rst.h
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+++ b/lib/ngtcp2_rst.h
@@ -0,0 +1,85 @@
+/*
+ * ngtcp2
+ *
+ * Copyright (c) 2019 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGTCP2_RST_H
+#define NGTCP2_RST_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "ngtcp2_window_filter.h"
+
+typedef struct ngtcp2_rtb_entry ngtcp2_rtb_entry;
+
+/**
+ * @struct
+ *
+ * ngtcp2_rs contains connection state for delivery rate estimation.
+ */
+typedef struct ngtcp2_rs {
+  ngtcp2_duration interval;
+  uint64_t delivered;
+  uint64_t prior_delivered;
+  ngtcp2_tstamp prior_ts;
+  uint64_t tx_in_flight;
+  uint64_t lost;
+  uint64_t prior_lost;
+  ngtcp2_duration send_elapsed;
+  ngtcp2_duration ack_elapsed;
+  int is_app_limited;
+} ngtcp2_rs;
+
+void ngtcp2_rs_init(ngtcp2_rs *rs);
+
+/*
+ * ngtcp2_rst implements delivery rate estimation described in
+ * https://tools.ietf.org/html/draft-cheng-iccrg-delivery-rate-estimation-00
+ */
+typedef struct ngtcp2_rst {
+  ngtcp2_rs rs;
+  ngtcp2_window_filter wf;
+  uint64_t delivered;
+  ngtcp2_tstamp delivered_ts;
+  ngtcp2_tstamp first_sent_ts;
+  uint64_t app_limited;
+  uint64_t next_round_delivered;
+  uint64_t round_count;
+  uint64_t lost;
+  int is_cwnd_limited;
+} ngtcp2_rst;
+
+void ngtcp2_rst_init(ngtcp2_rst *rst);
+
+void ngtcp2_rst_on_pkt_sent(ngtcp2_rst *rst, ngtcp2_rtb_entry *ent,
+                            const ngtcp2_conn_stat *cstat);
+int ngtcp2_rst_on_ack_recv(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat,
+                           uint64_t pkt_delivered);
+void ngtcp2_rst_update_rate_sample(ngtcp2_rst *rst, const ngtcp2_rtb_entry *ent,
+                                   ngtcp2_tstamp ts);
+void ngtcp2_rst_update_app_limited(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat);
+
+#endif /* NGTCP2_RST_H */