From 961d1e847c2ec76446863542abd164522c5d745d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ragnar=20Dahl=C3=A9n?= <r.dahlen@gmail.com>
Date: Wed, 6 Apr 2016 14:25:14 +0100
Subject: [PATCH] linux: kernel config for extended BPF support

- Enable BPF_SYSCALL and BPF_EVENTS
- Build modules for NET_CLS_BPF and NET_ACT_BPF

With these config options we can leverage the full potential of BPF for
tracing and instrumenting Linux systems, for example using
libraries/tools like those provided by the bcc project.
---
 pkgs/os-specific/linux/kernel/common-config.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index f3dd32386bc9..58af04fbb8ab 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -118,6 +118,10 @@ with stdenv.lib;
   ${optionalString (stdenv.system == "x86_64-linux") ''
     BPF_JIT y
   ''}
+  ${optionalString (versionAtLeast version "4.4") ''
+    NET_CLS_BPF m
+    NET_ACT_BPF m
+  ''}
 
   # Wireless networking.
   CFG80211_WEXT? y # Without it, ipw2200 drivers don't build
@@ -398,6 +402,10 @@ with stdenv.lib;
   ${optionalString (versionAtLeast version "3.10") ''
     UPROBE_EVENT y
   ''}
+  ${optionalString (versionAtLeast version "4.4") ''
+    BPF_SYSCALL y
+    BPF_EVENTS y
+  ''}
   FUNCTION_PROFILER y
   RING_BUFFER_BENCHMARK n