Hi Peter,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Peter-Oskolkov/bpf-add-BPF_LWT_ENCAP_IP-option-to-bpf_lwt_push_encap/20190207-205725
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-l1-02071408 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net//core/filter.c: In function 'bpf_push_ip_encap':

quoted

net//core/filter.c:4808:9: error: implicit declaration of function 'bpf_lwt_push_ip_encap' [-Werror=implicit-function-declaration]

     return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);
            ^
   net//core/filter.c: At top level:
   net//core/filter.c:4805:12: warning: 'bpf_push_ip_encap' defined but not used [-Wunused-function]
    static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
               ^
   cc1: some warnings being treated as errors

vim +/bpf_lwt_push_ip_encap +4808 net//core/filter.c

  4804	
  4805	static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
  4806				     bool ingress)
  4807	{

4808		return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);

  4809	}
  4810	

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