Patch for 4.14 stable tree "net: usb: ax88179_178a needs FLAG_SEND_ZLP" - Linux-stable-mirror

25 Jul 2022

For 4.14 stable tree:
--------------------
From 36a15e1cb134c0395261ba1940762703f778438c Mon Sep 17 00:00:00 2001
From: Jose Alonso joalonsof@gmail.com
Date: Mon, 13 Jun 2022 15:32:44 -0300
Subject: net: usb: ax88179_178a needs FLAG_SEND_ZLP
From: Jose Alonso joalonsof@gmail.com
commit 36a15e1cb134c0395261ba1940762703f778438c upstream.
The extra byte inserted by usbnet.c when
 (length % dev->maxpacket == 0) is causing problems to device.
This patch sets FLAG_SEND_ZLP to avoid this.
Tested with: 0b95:1790 ASIX Electronics Corp. AX88179 Gigabit Ethernet
Problems observed:
======================================================================
1) Using ssh/sshfs. The remote sshd daemon can abort with the message:
   "message authentication code incorrect"
   This happens because the tcp message sent is corrupted during the
   USB "Bulk out". The device calculate the tcp checksum and send a
   valid tcp message to the remote sshd. Then the encryption detects
   the error and aborts.
2) NETDEV WATCHDOG: ... (ax88179_178a): transmit queue 0 timed out
3) Stop normal work without any log message.
   The "Bulk in" continue receiving packets normally.
   The host sends "Bulk out" and the device responds with -ECONNRESET.
   (The netusb.c code tx_complete ignore -ECONNRESET)
Under normal conditions these errors take days to happen and in
intense usage take hours.
A test with ping gives packet loss, showing that something is wrong:
ping -4 -s 462 {destination}	# 462 = 512 - 42 - 8
Not all packets fail.
My guess is that the device tries to find another packet starting
at the extra byte and will fail or not depending on the next
bytes (old buffer content).
======================================================================
Signed-off-by: Jose Alonso joalonsof@gmail.com
Signed-off-by: David S. Miller davem@davemloft.net
Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
---
 drivers/net/usb/ax88179_178a.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1707,7 +1707,7 @@ static const struct driver_info ax88179_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1720,7 +1720,7 @@ static const struct driver_info ax88178a_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1733,7 +1733,7 @@ static const struct driver_info cypress_GX3_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1746,7 +1746,7 @@ static const struct driver_info dlink_dub1312_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1759,7 +1759,7 @@ static const struct driver_info sitecom_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1772,7 +1772,7 @@ static const struct driver_info samsung_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1785,7 +1785,7 @@ static const struct driver_info lenovo_info = {
    .link_reset = ax88179_link_reset,
    .reset = ax88179_reset,
    .stop = ax88179_stop,
-	.flags = FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };
@@ -1798,7 +1798,7 @@ static const struct driver_info belkin_info = {
    .link_reset = ax88179_link_reset,
    .reset	= ax88179_reset,
    .stop	= ax88179_stop,
-	.flags	= FLAG_ETHER | FLAG_FRAMING_AX,
+	.flags	= FLAG_ETHER | FLAG_FRAMING_AX | FLAG_SEND_ZLP,
    .rx_fixup = ax88179_rx_fixup,
    .tx_fixup = ax88179_tx_fixup,
 };

    