From 8062c985534a884216c875b2f1a467e4e41fa6a2 Mon Sep 17 00:00:00 2001
From: LuK1337 <priv.luk@gmail.com>
Date: Mon, 19 Oct 2020 21:42:02 +0200
Subject: [PATCH] sdm660-common: TetheringOverlay: Disable BPF offload

The new trafficController design is based on per-cgroup eBPF filter as well as xt_bpf netfilter module inside the kernel.
However, support for per-cgroup eBPF is available on only on kernels >=4.9 . Disable BPF offloading support completely
as without proper per-cgroup eBPF, the stats returns errors continuously.

E TetherController: Error processing tether stats from BPF maps: Get firstKey map -1 failed: Bad file descriptor

Ref:
[0]: https://source.android.com/devices/tech/datausage/ebpf-traffic-monitor
[1]: https://github.com/LineageOS/android_system_netd/blob/4e0a5f13fc1018d0d5f60616c32b863277937134/server/TetherController.cpp#L1047

Change-Id: Ic7db658130f42fc0737bfb52aef7235c6fea0db2
---
 rro_overlays/TetheringOverlay/res/values/config.xml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rro_overlays/TetheringOverlay/res/values/config.xml b/rro_overlays/TetheringOverlay/res/values/config.xml
index d651db22..4f610f70 100644
--- a/rro_overlays/TetheringOverlay/res/values/config.xml
+++ b/rro_overlays/TetheringOverlay/res/values/config.xml
@@ -19,6 +19,12 @@
 
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
 
+    <!-- Use the BPF offload for tethering when the kernel has support. True by default.
+         If the device doesn't want to support tether BPF offload, this should be false.
+         Note that this setting could be overridden by device config.
+    -->
+    <bool translatable="false" name="config_tether_enable_bpf_offload">false</bool>
+
     <!-- List of regexpressions describing the interface (if any) that represent tetherable
          USB interfaces.  If the device doesn't want to support tething over USB this should
          be empty.  An example would be "usb.*" -->