Re: [PATCH bpf-next 2/3] bpf: Add support for writing to nf_conn:mark

[kernel test robot]

Hi Daniel,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Daniel-Xu/Support-direct-writes-to-nf_conn-mark/20220816-060429
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arm-versatile_defconfig (https://download.01.org/0day-ci/archive/20220819/202208190318.HygywK17-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project aed5e3bea138ce581d682158eb61c27b3cfdd6ec)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/c7b21d163eb9c61514dd86baf4281deb4d4387bb
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Daniel-Xu/Support-direct-writes-to-nf_conn-mark/20220816-060429
        git checkout c7b21d163eb9c61514dd86baf4281deb4d4387bb
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> net/core/filter.c:8723:10: error: call to undeclared function 'btf_struct_access'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   return btf_struct_access(log, btf, t, off, size, atype, next_btf_id,
                          ^
   net/core/filter.c:8797:10: error: call to undeclared function 'btf_struct_access'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                   return btf_struct_access(log, btf, t, off, size, atype, next_btf_id,
                          ^
   2 errors generated.


vim +/btf_struct_access +8723 net/core/filter.c

  8714	
  8715	static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log,
  8716						const struct btf *btf,
  8717						const struct btf_type *t, int off,
  8718						int size, enum bpf_access_type atype,
  8719						u32 *next_btf_id,
  8720						enum bpf_type_flag *flag)
  8721	{
  8722		if (atype == BPF_READ)
> 8723			return btf_struct_access(log, btf, t, off, size, atype, next_btf_id,
  8724						 flag);
  8725	
  8726		return nf_conntrack_btf_struct_access(log, btf, t, off, size, atype,
  8727						      next_btf_id, flag);
  8728	}
  8729	

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