From 5e0d96b76793c5c5dec15e24976c44e70d34c0b8 Mon Sep 17 00:00:00 2001
From: behzad nouri <behzadnouri@gmail.com>
Date: Wed, 14 Aug 2024 13:19:22 -0500
Subject: [PATCH] exposes current path MTU discovered in connection stats

---
 quinn-proto/src/connection/mod.rs   | 1 +
 quinn-proto/src/connection/stats.rs | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/quinn-proto/src/connection/mod.rs b/quinn-proto/src/connection/mod.rs
index 4083c494e..2c0f92b55 100644
--- a/quinn-proto/src/connection/mod.rs
+++ b/quinn-proto/src/connection/mod.rs
@@ -1207,6 +1207,7 @@ impl Connection {
         let mut stats = self.stats;
         stats.path.rtt = self.path.rtt.get();
         stats.path.cwnd = self.path.congestion.window();
+        stats.path.current_mtu = self.path.mtud.current_mtu();
 
         stats
     }
diff --git a/quinn-proto/src/connection/stats.rs b/quinn-proto/src/connection/stats.rs
index 0bb612e08..fc19c6304 100644
--- a/quinn-proto/src/connection/stats.rs
+++ b/quinn-proto/src/connection/stats.rs
@@ -152,6 +152,8 @@ pub struct PathStats {
     pub lost_plpmtud_probes: u64,
     /// The number of times a black hole was detected in the path
     pub black_holes_detected: u64,
+    /// Largest UDP payload size the path currently supports
+    pub current_mtu: u16,
 }
 
 /// Connection statistics