From f2f82afcc47ecf2895d6292751309c7c3a8a8e65 Mon Sep 17 00:00:00 2001
From: Sunil Nimmagadda <sunil@nimmagadda.net>
Date: Sun, 24 Nov 2024 10:10:33 +0530
Subject: Unroll loop, atmost two iterations required.

---
 src/vrrpv2.rs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/vrrpv2.rs b/src/vrrpv2.rs
index c9d5031..643d6c3 100644
--- a/src/vrrpv2.rs
+++ b/src/vrrpv2.rs
@@ -200,9 +200,8 @@ fn checksum(bytes: &[u8]) -> u16 {
     if !remainder.is_empty() {
         sum += u32::from(remainder[0]);
     }
-    while (sum >> 16) > 0 {
-        sum = (sum & 0xffff) + (sum >> 16);
-    }
+    sum = (sum >> 16) + (sum & 0xffff);
+    sum += sum >> 16;
     !(sum as u16)
 }
 
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