[PATCH] Fix l2tp stat counter

[Dominik Heidler]

The 32 bit counter was incorrectly interpreted as signed
when being converted to the 64 bit value used for the
sysfs output.

Signed-off-by: Dominik Heidler <dominik at heidler.eu>
---
 build_patches/ar71xx-3.18-l2tp-stats.patch | 42 ++++++++++++++++++++++++++++++
 buildscript                                |  3 +++
 2 files changed, 45 insertions(+)
 create mode 100644 build_patches/ar71xx-3.18-l2tp-stats.patch

diff --git a/build_patches/ar71xx-3.18-l2tp-stats.patch b/build_patches/ar71xx-3.18-l2tp-stats.patch
new file mode 100644
index 0000000..039d2c8
--- /dev/null
+++ b/build_patches/ar71xx-3.18-l2tp-stats.patch
@@ -0,0 +1,42 @@
+diff -ruN a/target/linux/ar71xx/patches-3.18/fix-l2tp-stats-couter-on-32-Bit-Systems.patch b/target/linux/ar71xx/patches-3.18/fix-l2tp-stats-couter-on-32-Bit-Systems.patch
+--- a/target/linux/ar71xx/patches-3.18/fix-l2tp-stats-couter-on-32-Bit-Systems.patch	1970-01-01 01:00:00.000000000 +0100
++++ b/target/linux/ar71xx/patches-3.18/fix-l2tp-stats-couter-on-32-Bit-Systems.patch	2016-03-12 18:41:32.818602442 +0100
+@@ -0,0 +1,38 @@
++From 19b1c8733b99f13005f2d8918bce588f0b2556f8 Mon Sep 17 00:00:00 2001
++From: Dominik Heidler <dominik at heidler.eu>
++Date: Sat, 12 Mar 2016 18:37:42 +0100
++Subject: [PATCH] Fix l2tp stats couter on 32 Bit Systems
++
++---
++ net/l2tp/l2tp_eth.c | 9 +++++++++
++ 1 file changed, 9 insertions(+)
++
++diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
++index e253c26..a18c2ff 100644
++--- a/net/l2tp/l2tp_eth.c
+++++ b/net/l2tp/l2tp_eth.c
++@@ -111,12 +111,21 @@ static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev,
++ {
++ 	struct l2tp_eth *priv = netdev_priv(dev);
++ 
+++	#if BITS_PER_LONG == 64
++ 	stats->tx_bytes   = atomic_long_read(&priv->tx_bytes);
++ 	stats->tx_packets = atomic_long_read(&priv->tx_packets);
++ 	stats->tx_dropped = atomic_long_read(&priv->tx_dropped);
++ 	stats->rx_bytes   = atomic_long_read(&priv->rx_bytes);
++ 	stats->rx_packets = atomic_long_read(&priv->rx_packets);
++ 	stats->rx_errors  = atomic_long_read(&priv->rx_errors);
+++	#else
+++	stats->tx_bytes   = (unsigned long) atomic_long_read(&priv->tx_bytes);
+++	stats->tx_packets = (unsigned long) atomic_long_read(&priv->tx_packets);
+++	stats->tx_dropped = (unsigned long) atomic_long_read(&priv->tx_dropped);
+++	stats->rx_bytes   = (unsigned long) atomic_long_read(&priv->rx_bytes);
+++	stats->rx_packets = (unsigned long) atomic_long_read(&priv->rx_packets);
+++	stats->rx_errors  = (unsigned long) atomic_long_read(&priv->rx_errors);
+++	#endif
++ 	return stats;
++ }
++ 
++-- 
++2.7.2
++
diff --git a/buildscript b/buildscript
index 362781a..6f4bb09 100755
--- a/buildscript
+++ b/buildscript
@@ -171,6 +171,9 @@ prepare() {
     #add Support for GL-AR150 see also http://git.openwrt.org/?p=openwrt.git;a=commit;h=8211e81bce57392635fa3ad6572514387118e4a5
     patch -p0 -d "$target" -i "$PWD"/build_patches/ar71xx-add-support-for-GL-AR150.patch
 
+    # fix l2tp stat counter on 32 Bit systems
+    patch -p1 -d "$target" -i "$PWD"/build_patches/ar71xx-3.18-l2tp-stats.patch
+
     #saves ~200MB for each build
     test -d ./src/dl || mkdir ./src/dl
     ln -s ../../src/dl "$target"/dl
-- 
2.7.2