# Re: \[PATCH net-next v7 1/3\] net: flow\_dissector: extend bpf flow dissector support with vnet hdr

- From: kernel test robot \<hidden\>
- Date: 2021-06-17 13:32:48 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/06/11205682
- Thread: https://ratatoskr.run/netdev/2021/06/11205646/t.md

```text
Hi Tanner,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Tanner-Love/virtio_net-add-optional-flow-dissection-in-virtio_net_hdr_to_skb/20210617-082208
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 0c33795231bff5df410bd405b569c66851e92d4b
config: x86_64-randconfig-a014-20210617 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/b03a1eb684b925a09ae011d0e620d98ebf3b0abd
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tanner-Love/virtio_net-add-optional-flow-dissection-in-virtio_net_hdr_to_skb/20210617-082208
        git checkout b03a1eb684b925a09ae011d0e620d98ebf3b0abd
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

   net/core/filter.c:7900:15: error: implicit declaration of function 'bpf_get_btf_vmlinux' [-Werror,-Wimplicit-function-declaration]
                   info->btf = bpf_get_btf_vmlinux();
                               ^
>> net/core/filter.c:7900:13: warning: incompatible integer to pointer conversion assigning to 'struct btf *' from 'int' [-Wint-conversion]
                   info->btf = bpf_get_btf_vmlinux();
                             ^ ~~~~~~~~~~~~~~~~~~~~~
   1 warning and 1 error generated.


vim +7900 net/core/filter.c

  7884	
  7885	int bpf_flow_keys_is_valid_access(int off, int size, enum bpf_access_type t,
  7886					  struct bpf_insn_access_aux *info)
  7887	{
  7888		if (off < 0 ||
  7889		    (u64)off + size > offsetofend(struct bpf_flow_keys, vhdr))
  7890			return -EACCES;
  7891	
  7892		switch (off) {
  7893		case bpf_ctx_range_ptr(struct bpf_flow_keys, vhdr):
  7894			if (t == BPF_WRITE || off % size != 0 || size != sizeof(__u64))
  7895				return -EACCES;
  7896	
  7897			if (!bpf_flow_dissector_btf_ids[0])
  7898				return -EINVAL;
  7899	
> 7900			info->btf = bpf_get_btf_vmlinux();
  7901			info->reg_type = PTR_TO_BTF_ID_OR_NULL;
  7902			info->btf_id = bpf_flow_dissector_btf_ids[0];
  7903	
  7904			break;
  7905		}
  7906	
  7907		return 0;
  7908	}
  7909	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
```

## Attachments

- [.config.gz](https://ratatoskr.run/netdev/2021/06/11205682/attachment/0) (application/gzip, 32888 bytes)