* Re: [PATCH bpf-next v4 3/3] selftests/bpf: Add bpf_fib_lookup() VLAN flag tests
[not found] <20260623025147.1001664-4-avinash.duduskar@gmail.com>
@ 2026-06-23 12:36 ` kernel test robot
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From: kernel test robot @ 2026-06-23 12:36 UTC (permalink / raw)
To: Avinash Duduskar, ast, daniel, andrii
Cc: llvm, oe-kbuild-all, eddyz87, memxor, martin.lau, song,
yonghong.song, jolsa, emil, john.fastabend, sdf, davem, edumazet,
kuba, pabeni, horms, shuah, hawk, yatsenko, leon.hwang, kpsingh,
a.s.protopopov, ameryhung, rongtao, eyal.birger, bpf, netdev,
linux-kernel, linux-kselftest
Hi Avinash,
kernel test robot noticed the following build warnings:
[auto build test WARNING on a975094bf98ca97be9146f9d3b5681a6f9cf5ce3]
url: https://github.com/intel-lab-lkp/linux/commits/Avinash-Duduskar/bpf-Add-BPF_FIB_LOOKUP_VLAN-flag-to-bpf_fib_lookup-helper/20260623-105336
base: a975094bf98ca97be9146f9d3b5681a6f9cf5ce3
patch link: https://lore.kernel.org/r/20260623025147.1001664-4-avinash.duduskar%40gmail.com
patch subject: [PATCH bpf-next v4 3/3] selftests/bpf: Add bpf_fib_lookup() VLAN flag tests
config: i386-buildonly-randconfig-006-20260623 (https://download.01.org/0day-ci/archive/20260623/202606232057.G1fSw98N-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260623/202606232057.G1fSw98N-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202606232057.G1fSw98N-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> net/core/filter.c:6567:14: warning: unused variable 'net' [-Wunused-variable]
6567 | struct net *net = dev_net(skb->dev);
| ^~~
1 warning generated.
vim +/net +6567 net/core/filter.c
87f5fc7e48dd31 David Ahern 2018-05-09 6563
87f5fc7e48dd31 David Ahern 2018-05-09 6564 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
87f5fc7e48dd31 David Ahern 2018-05-09 6565 struct bpf_fib_lookup *, params, int, plen, u32, flags)
87f5fc7e48dd31 David Ahern 2018-05-09 6566 {
4f74fede40df8d David Ahern 2018-05-21 @6567 struct net *net = dev_net(skb->dev);
f392520e15094e Avinash Duduskar 2026-06-23 6568 struct net_device *fwd_dev = NULL;
4c79579b44b187 David Ahern 2018-06-26 6569 int rc = -EAFNOSUPPORT;
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6570 bool check_mtu = false;
4f74fede40df8d David Ahern 2018-05-21 6571
87f5fc7e48dd31 David Ahern 2018-05-09 6572 if (plen < sizeof(*params))
87f5fc7e48dd31 David Ahern 2018-05-09 6573 return -EINVAL;
87f5fc7e48dd31 David Ahern 2018-05-09 6574
31de4105f00d64 Martin KaFai Lau 2023-02-17 6575 if (flags & ~BPF_FIB_LOOKUP_MASK)
9ce64f192d161a David Ahern 2018-05-29 6576 return -EINVAL;
9ce64f192d161a David Ahern 2018-05-29 6577
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6578 if (params->tot_len)
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6579 check_mtu = true;
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6580
87f5fc7e48dd31 David Ahern 2018-05-09 6581 switch (params->family) {
87f5fc7e48dd31 David Ahern 2018-05-09 6582 #if IS_ENABLED(CONFIG_INET)
87f5fc7e48dd31 David Ahern 2018-05-09 6583 case AF_INET:
f392520e15094e Avinash Duduskar 2026-06-23 6584 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu,
f392520e15094e Avinash Duduskar 2026-06-23 6585 &fwd_dev);
4f74fede40df8d David Ahern 2018-05-21 6586 break;
87f5fc7e48dd31 David Ahern 2018-05-09 6587 #endif
87f5fc7e48dd31 David Ahern 2018-05-09 6588 #if IS_ENABLED(CONFIG_IPV6)
87f5fc7e48dd31 David Ahern 2018-05-09 6589 case AF_INET6:
f392520e15094e Avinash Duduskar 2026-06-23 6590 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu,
f392520e15094e Avinash Duduskar 2026-06-23 6591 &fwd_dev);
4f74fede40df8d David Ahern 2018-05-21 6592 break;
87f5fc7e48dd31 David Ahern 2018-05-09 6593 #endif
87f5fc7e48dd31 David Ahern 2018-05-09 6594 }
4f74fede40df8d David Ahern 2018-05-21 6595
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6596 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) {
f392520e15094e Avinash Duduskar 2026-06-23 6597 /* without tot_len, check the skb against the FIB-result
f392520e15094e Avinash Duduskar 2026-06-23 6598 * device's MTU
2c0a10af688c02 Jesper Dangaard Brouer 2021-02-09 6599 */
f392520e15094e Avinash Duduskar 2026-06-23 6600 if (!is_skb_forwardable(fwd_dev, skb))
4c79579b44b187 David Ahern 2018-06-26 6601 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
e1850ea9bd9eca Jesper Dangaard Brouer 2021-02-09 6602
f392520e15094e Avinash Duduskar 2026-06-23 6603 params->mtu_result = fwd_dev->mtu; /* union with tot_len */
4f74fede40df8d David Ahern 2018-05-21 6604 }
4f74fede40df8d David Ahern 2018-05-21 6605
4c79579b44b187 David Ahern 2018-06-26 6606 return rc;
87f5fc7e48dd31 David Ahern 2018-05-09 6607 }
87f5fc7e48dd31 David Ahern 2018-05-09 6608
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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[not found] <20260623025147.1001664-4-avinash.duduskar@gmail.com>
2026-06-23 12:36 ` [PATCH bpf-next v4 3/3] selftests/bpf: Add bpf_fib_lookup() VLAN flag tests kernel test robot
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