Disable BPF offload

lineage_src_root/device/samsung/s5neolte/device.mk

@@ -124,6 +124,10 @@ PRODUCT_COPY_FILES += \
 # Overlays
 DEVICE_PACKAGE_OVERLAYS += $(LOCAL_PATH)/overlay
 
+# Tethering
+PRODUCT_PACKAGES += \
+    TetheringConfigOverlay
+
 # Vendor security patch level
 PRODUCT_PROPERTY_OVERRIDES += \
     ro.lineage.build.vendor_security_patch=2017-03-01

lineage_src_root/device/samsung/s5neolte/rro_overlays/TetheringOverlay/Android.bp

@@ -0,0 +1,24 @@
+//
+// Copyright (C) 2020 The Android Open-Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+runtime_resource_overlay {
+    name: "TetheringConfigOverlay",
+    theme: "TetheringConfigOverlay",
+    resource_dirs: ["res"],
+    product_specific: true,
+    certificate: "platform", 
+    sdk_version: "current"
+}

lineage_src_root/device/samsung/s5neolte/rro_overlays/TetheringOverlay/AndroidManifest.xml

@@ -0,0 +1,11 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+  package="com.android.networkstack.tethering.samsung_s5neolte"
+  android:versionCode="1"
+  android:versionName="1.0">
+  <application android:hasCode="false" />
+  <overlay
+    android:targetPackage="com.android.networkstack.tethering"
+    android:targetName="TetheringConfig"
+    android:isStatic="true"
+    android:priority="0"/>
+</manifest>

lineage_src_root/device/samsung/s5neolte/rro_overlays/TetheringOverlay/res/values/config.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+** Copyright 2020, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<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.
+    -->
+    <!--
+         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
+    -->
+    <bool translatable="false" name="config_tether_enable_bpf_offload">false</bool>
+</resources>