From db052177713adbc6aa21f95aec6f3be6274504b8 Mon Sep 17 00:00:00 2001
From: jan <jan@openbsd.org>
Date: Wed, 8 May 2024 17:52:11 +0000
Subject: [PATCH] ixl(4): force mss of tso packets in hardware supported range.

ok bluhm@
---
 sys/dev/pci/if_ixl.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sys/dev/pci/if_ixl.c b/sys/dev/pci/if_ixl.c
index 36ce95aac55..398b995a040 100644
--- a/sys/dev/pci/if_ixl.c
+++ b/sys/dev/pci/if_ixl.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_ixl.c,v 1.99 2024/05/07 18:35:23 jan Exp $ */
+/*	$OpenBSD: if_ixl.c,v 1.100 2024/05/08 17:52:11 jan Exp $ */
 
 /*
  * Copyright (c) 2013-2015, Intel Corporation
@@ -2854,7 +2854,11 @@ ixl_tx_setup_offload(struct mbuf *m0, struct ixl_tx_ring *txr,
 
 			hlen += ext.tcphlen;
 
-			outlen = m0->m_pkthdr.ph_mss;
+			/*
+			 * The MSS should not be set to a lower value than 64
+			 * or larger than 9668 bytes.
+			 */
+			outlen = MIN(9668, MAX(64, m0->m_pkthdr.ph_mss));
 			paylen = m0->m_pkthdr.len - ETHER_HDR_LEN - hlen;
 
 			ring = IXL_DMA_KVA(&txr->txr_mem);
-- 
2.20.1