From 101f8af015b0218479b63017f60682911ca7a00b Mon Sep 17 00:00:00 2001
From: Reinier van der Walle <walle@astron.nl>
Date: Wed, 9 Jun 2021 16:00:11 +0200
Subject: [PATCH] fixed IP checksum calculation
---
libraries/io/eth/src/vhdl/eth_checksum.vhd | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libraries/io/eth/src/vhdl/eth_checksum.vhd b/libraries/io/eth/src/vhdl/eth_checksum.vhd
index bfe6208f70..aead4db3f1 100644
--- a/libraries/io/eth/src/vhdl/eth_checksum.vhd
+++ b/libraries/io/eth/src/vhdl/eth_checksum.vhd
@@ -150,7 +150,7 @@ BEGIN
sum;
-- Accumulate the last carry
- last_dat <= sum(c_halfword_w-1 DOWNTO 0) + sum_cin;
+ last_dat <= sum(c_halfword_w-1 DOWNTO 0) + sum_cin + word_sum_cin; -- Also add word_sum_cin in the case that the last word has a carry.
-- Checksum is 1-complement of the sum
nxt_checksum <= NOT(STD_LOGIC_VECTOR(last_dat)) WHEN prev_in_eop_dly='1' ELSE i_checksum;
--
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