From f3ae75ebd3410c83c5ad4d8b874061d25be95043 Mon Sep 17 00:00:00 2001
From: Ian McIntyre <me@mciantyre.dev>
Date: Thu, 17 Jul 2025 20:59:46 -0400
Subject: Fix max burst size computation

The units are "MTUs," not "bytes." With this in mind, we can burst the
minimum number of buffers.
---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index e24ccb7..0eda7f2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -347,7 +347,7 @@ impl<const N: u8> smoltcp::phy::Device for Enet<N> {
         let mut caps = smoltcp::phy::DeviceCapabilities::default();
         caps.medium = smoltcp::phy::Medium::Ethernet;
         caps.max_transmission_unit = mtu;
-        caps.max_burst_size = Some(mtu);
+        caps.max_burst_size = Some(self.tx_ring.len().min(self.rx_ring.len()));
 
         caps.checksum.ipv4 = smoltcp::phy::Checksum::None;
         caps.checksum.udp = smoltcp::phy::Checksum::None;
-- 
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