From b2217c935e3f30d15821b1c5183ab4dd4c9d9dd2 Mon Sep 17 00:00:00 2001
From: Tim Harvey <tharvey@gateworks.com>
Date: Mon, 29 Sep 2025 12:21:49 -0700
Subject: [PATCH] net: lwip: ensure alignment of packet buffers

Network packet buffers should be aligned to PKTALIGN. Add a compiler
attribute to ensure this.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
[jf: use __aligned(x) from <linux/compiler_attributes.h>]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
---
 net/lwip/net-lwip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/lwip/net-lwip.c b/net/lwip/net-lwip.c
index 1a70cedfb58..8741f65fe12 100644
--- a/net/lwip/net-lwip.c
+++ b/net/lwip/net-lwip.c
@@ -7,6 +7,7 @@
 #include <dm/device.h>
 #include <dm/uclass.h>
 #include <hexdump.h>
+#include <linux/compiler_attributes.h>
 #include <linux/kernel.h>
 #include <lwip/ip4_addr.h>
 #include <lwip/dns.h>
@@ -30,7 +31,8 @@ void (*push_packet)(void *, int len) = 0;
 int net_try_count;
 static int net_restarted;
 int net_restart_wrap;
-static uchar net_pkt_buf[(PKTBUFSRX) * PKTSIZE_ALIGN + PKTALIGN];
+static uchar net_pkt_buf[(PKTBUFSRX) * PKTSIZE_ALIGN + PKTALIGN]
+	__aligned(PKTALIGN);
 uchar *net_rx_packets[PKTBUFSRX];
 uchar *net_rx_packet;
 const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-- 
2.47.3