netdev - Re: [PATCH v4 bpf-next 06/14] bpf: Whitelist some fields in nf_conn for BPF

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Message-ID: <202205271522.W0HxUVz1-lkp@intel.com>
Date:   Fri, 27 May 2022 15:34:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>, bpf@...r.kernel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, davem@...emloft.net, kuba@...nel.org,
        edumazet@...gle.com, pabeni@...hat.com, pablo@...filter.org,
        fw@...len.de, netfilter-devel@...r.kernel.org,
        lorenzo.bianconi@...hat.com, brouer@...hat.com, toke@...hat.com,
        memxor@...il.com, yhs@...com
Subject: Re: [PATCH v4 bpf-next 06/14] bpf: Whitelist some fields in nf_conn
 for BPF_WRITE

Hi Lorenzo,

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/Lorenzo-Bianconi/net-netfilter-add-kfunc-helper-to-update-ct-timeout/20220527-053913
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-randconfig-a005 (https://download.01.org/0day-ci/archive/20220527/202205271522.W0HxUVz1-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 134d7f9a4b97e9035150d970bd9e376043c4577e)
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
        # https://github.com/intel-lab-lkp/linux/commit/c346565af9b023d9231ca8fca2e1b8c66a782f84
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Lorenzo-Bianconi/net-netfilter-add-kfunc-helper-to-update-ct-timeout/20220527-053913
        git checkout c346565af9b023d9231ca8fca2e1b8c66a782f84
        # 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=x86_64 SHELL=/bin/bash net/

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

All errors (new ones prefixed by >>):

>> net/core/filter.c:10479:9: 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, flag);
                  ^
   1 error generated.


vim +/btf_struct_access +10479 net/core/filter.c

 10459	
 10460	static int xdp_tc_btf_struct_access(struct bpf_verifier_log *log,
 10461					    const struct btf *btf,
 10462					    const struct btf_type *t, int off, int size,
 10463					    enum bpf_access_type atype,
 10464					    u32 *next_btf_id, enum bpf_type_flag *flag)
 10465	{
 10466		int ret;
 10467	
 10468		if (atype == BPF_READ || !READ_ONCE(nf_conn_btf_struct_access))
 10469			goto end;
 10470		mutex_lock(&nf_conn_btf_struct_access_mtx);
 10471		if (!nf_conn_btf_struct_access)
 10472			goto end_unlock;
 10473		ret = nf_conn_btf_struct_access(log, btf, t, off, size, atype, next_btf_id, flag);
 10474		mutex_unlock(&nf_conn_btf_struct_access_mtx);
 10475		return ret;
 10476	end_unlock:
 10477		mutex_unlock(&nf_conn_btf_struct_access_mtx);
 10478	end:
 10479		return btf_struct_access(log, btf, t, off, size, atype, next_btf_id, flag);
 10480	}
 10481	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp