netdev - [PATCH net v2] r8169: fix packet truncation after S4 resume on RTL8168H/RTL8111H

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Message-Id: <20251009122549.3955845-1-lilinmao@kylinos.cn>
Date: Thu,  9 Oct 2025 20:25:49 +0800
From: Linmao Li <lilinmao@...inos.cn>
To: netdev@...r.kernel.org
Cc: jacob.e.keller@...el.com,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	Linmao Li <lilinmao@...inos.cn>
Subject: [PATCH net v2] r8169: fix packet truncation after S4 resume on RTL8168H/RTL8111H

After resume from S4 (hibernate), RTL8168H/RTL8111H truncates incoming
packets. Packet captures show messages like "IP truncated-ip - 146 bytes
missing!".

The issue is caused by RxConfig not being properly re-initialized after
resume. Re-initializing the RxConfig register before the chip
re-initialization sequence avoids the truncation and restores correct
packet reception.

This follows the same pattern as commit ef9da46ddef0 ("r8169: fix data
corruption issue on RTL8402").

Fixes: 6e1d0b898818 ("r8169:add support for RTL8168H and RTL8107E")
Signed-off-by: Linmao Li <lilinmao@...inos.cn>
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 9c601f271c02..4b0ac73565ea 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -4994,8 +4994,9 @@ static int rtl8169_resume(struct device *device)
 	if (!device_may_wakeup(tp_to_dev(tp)))
 		clk_prepare_enable(tp->clk);
 
-	/* Reportedly at least Asus X453MA truncates packets otherwise */
-	if (tp->mac_version == RTL_GIGA_MAC_VER_37)
+	/* Some chip versions may truncate packets without this initialization */
+	if (tp->mac_version == RTL_GIGA_MAC_VER_37 ||
+	    tp->mac_version == RTL_GIGA_MAC_VER_46)
 		rtl_init_rxcfg(tp);
 
 	return rtl8169_runtime_resume(device);
-- 
2.25.1