Missing helper functions

[tuxology]

I did an install using my llvm install script and bcc setup script (which are based on your kickstart file) on Linux kernel 4.2-rc4. Things go just fine and the llvm backend and bcc get compiled. However, when I try to run a simple example sudo ./hello_worpld.py, I get this error,

In file included from <built-in>:316:
In file included from <command line>:3:
/usr/share/bcc/include/bcc/helpers.h:78:18: error: use of undeclared identifier 'BPF_FUNC_get_cgroup_classid'
        (void *) BPF_FUNC_get_cgroup_classid;
                 ^
/usr/share/bcc/include/bcc/helpers.h:80:18: error: use of undeclared identifier 'BPF_FUNC_skb_vlan_push'
        (void *) BPF_FUNC_skb_vlan_push;
                 ^
/usr/share/bcc/include/bcc/helpers.h:82:18: error: use of undeclared identifier 'BPF_FUNC_skb_vlan_pop'
        (void *) BPF_FUNC_skb_vlan_pop;
                 ^
/usr/share/bcc/include/bcc/helpers.h:87:12: error: use of undeclared identifier 'BPF_FUNC_skb_get_tunnel_key'
  (void *) BPF_FUNC_skb_get_tunnel_key;
           ^
/usr/share/bcc/include/bcc/helpers.h:89:12: error: use of undeclared identifier 'BPF_FUNC_skb_set_tunnel_key'
  (void *) BPF_FUNC_skb_set_tunnel_key;
           ^
5 errors generated.
Traceback (most recent call last):
  File "./hello_world.py", line 17, in <module>
    b = BPF(text=prog)
  File "/usr/lib/python2.7/dist-packages/bpf/__init__.py", line 182, in __init__
    raise Exception("Failed to compile BPF module %s" % src_file)
Exception: Failed to compile BPF module 

I checked the uapi/linux/bpf.h supplied in 4.2-rc4 and found that these functions were missing from the bpf_func_id enum but are present in your compat directory. Simply disabling them for me works for now. Also, thanks for BCC 👍

[drzaeus77]

Hmm, looks like I will need to pay closer attention to the kernel version, since I have been always building from net-next branch. That branch does not always have the most accurate LINUX_VERSION_CODE.

[drzaeus77]

Would you be able to test the mentioned patch in your setup?

[tuxology]

Yes, this works.