netdev - Re: [PATCH bpf-next v2 2/2] bpf: Require only one of cong_avoid() and cong

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Date:   Fri, 10 Jun 2022 08:52:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jörn-Thorben Hinz 
        <jthinz@...lbox.tu-berlin.de>, bpf@...r.kernel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org,
        Jörn-Thorben Hinz 
        <jthinz@...lbox.tu-berlin.de>
Subject: Re: [PATCH bpf-next v2 2/2] bpf: Require only one of cong_avoid()
 and cong_control() from a TCP CC

Hi "Jörn-Thorben,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/J-rn-Thorben-Hinz/bpf-Allow-a-TCP-CC-to-write-sk_pacing_rate-and-sk_pacing_status/20220610-054718
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-a015 (https://download.01.org/0day-ci/archive/20220610/202206100820.VN7PQCkp-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 70d35fe1257e429266b83025997b400e9f79110e)
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/ac2a3c95ce28ad79c2ef7e6c52c4fd25af9f3c6d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review J-rn-Thorben-Hinz/bpf-Allow-a-TCP-CC-to-write-sk_pacing_rate-and-sk_pacing_status/20220610-054718
        git checkout ac2a3c95ce28ad79c2ef7e6c52c4fd25af9f3c6d
        # 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=i386 SHELL=/bin/bash net/ipv4/

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

All warnings (new ones prefixed by >>):

>> net/ipv4/bpf_tcp_ca.c:225:6: warning: unused variable 'prog_fd' [-Wunused-variable]
           int prog_fd;
               ^
   1 warning generated.


vim +/prog_fd +225 net/ipv4/bpf_tcp_ca.c

0baf26b0fcd74b Martin KaFai Lau   2020-01-08  218  
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  219  static int bpf_tcp_ca_init_member(const struct btf_type *t,
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  220  				  const struct btf_member *member,
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  221  				  void *kdata, const void *udata)
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  222  {
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  223  	const struct tcp_congestion_ops *utcp_ca;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  224  	struct tcp_congestion_ops *tcp_ca;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08 @225  	int prog_fd;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  226  	u32 moff;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  227  
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  228  	utcp_ca = (const struct tcp_congestion_ops *)udata;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  229  	tcp_ca = (struct tcp_congestion_ops *)kdata;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  230  
8293eb995f349a Alexei Starovoitov 2021-12-01  231  	moff = __btf_member_bit_offset(t, member) / 8;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  232  	switch (moff) {
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  233  	case offsetof(struct tcp_congestion_ops, flags):
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  234  		if (utcp_ca->flags & ~TCP_CONG_MASK)
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  235  			return -EINVAL;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  236  		tcp_ca->flags = utcp_ca->flags;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  237  		return 1;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  238  	case offsetof(struct tcp_congestion_ops, name):
8e7ae2518f5265 Martin KaFai Lau   2020-03-13  239  		if (bpf_obj_name_cpy(tcp_ca->name, utcp_ca->name,
8e7ae2518f5265 Martin KaFai Lau   2020-03-13  240  				     sizeof(tcp_ca->name)) <= 0)
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  241  			return -EINVAL;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  242  		if (tcp_ca_find(utcp_ca->name))
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  243  			return -EEXIST;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  244  		return 1;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  245  	}
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  246  
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  247  	return 0;
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  248  }
0baf26b0fcd74b Martin KaFai Lau   2020-01-08  249  

-- 
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https://01.org/lkp