openwrt/target/linux/brcm2708/patches-4.14/950-0265-net-lan78xx-Allow-for-VLAN-headers-in-timeout.patch

From 50340b55bb7af7c12259d3bce5da6ba969c58e00 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 4 Apr 2018 16:34:24 +0100
Subject: [PATCH 265/454] net: lan78xx: Allow for VLAN headers in timeout.

The frame abort timeout being set by lan78xx_set_rx_max_frame_length
didn't account for any VLAN headers, resulting in very low
throughput if used with tagged VLANs.
Use VLAN_ETH_HLEN instead of ETH_HLEN to correct for this.

See https://github.com/raspberrypi/linux/issues/2458

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/net/usb/lan78xx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2192,7 +2192,7 @@ static int lan78xx_change_mtu(struct net
 	if ((ll_mtu % dev->maxpacket) == 0)
 		return -EDOM;
 
-	ret = lan78xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
+	ret = lan78xx_set_rx_max_frame_length(dev, new_mtu + VLAN_ETH_HLEN);
 
 	netdev->mtu = new_mtu;
 
@@ -2485,7 +2485,8 @@ static int lan78xx_reset(struct lan78xx_
 	buf |= FCT_TX_CTL_EN_;
 	ret = lan78xx_write_reg(dev, FCT_TX_CTL, buf);
 
-	ret = lan78xx_set_rx_max_frame_length(dev, dev->net->mtu + ETH_HLEN);
+	ret = lan78xx_set_rx_max_frame_length(dev,
+					      dev->net->mtu + VLAN_ETH_HLEN);
 
 	ret = lan78xx_read_reg(dev, MAC_RX, &buf);
 	buf |= MAC_RX_RXEN_;