Re: [RFC PATCH v7 1/8] net_sched: Introduce eBPF based Qdisc

Re: [RFC PATCH v7 1/8] net_sched: Introduce eBPF based Qdisc

[kernel test robot]

Hi Amery,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on mst-vhost/linux-next]
[also build test ERROR on v6.7]
[cannot apply to bpf-next/master bpf/master net/main net-next/main linus/master horms-ipvs/master next-20240119]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Amery-Hung/net_sched-Introduce-eBPF-based-Qdisc/20240118-055917
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link:    https://lore.kernel.org/r/232881645a5c4c05a35df4ff1f08a19ef9a02662.1705432850.git.amery.hung%40bytedance.com
patch subject: [RFC PATCH v7 1/8] net_sched: Introduce eBPF based Qdisc
config: i386-buildonly-randconfig-002-20240120 (https://download.01.org/0day-ci/archive/20240120/202401201954.x8zfr4TI-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240120/202401201954.x8zfr4TI-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/202401201954.x8zfr4TI-lkp@intel.com/

All errors (new ones prefixed by >>):

>> net/core/filter.c:8929:9: error: call to undeclared function 'bpf_get_btf_vmlinux'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    8929 |                 btf = bpf_get_btf_vmlinux();
         |                       ^
>> net/core/filter.c:8929:7: error: incompatible integer to pointer conversion assigning to 'struct btf *' from 'int' [-Wint-conversion]
    8929 |                 btf = bpf_get_btf_vmlinux();
         |                     ^ ~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.


vim +/bpf_get_btf_vmlinux +8929 net/core/filter.c

  8909	
  8910	static bool tc_qdisc_is_valid_access(int off, int size,
  8911					     enum bpf_access_type type,
  8912					     const struct bpf_prog *prog,
  8913					     struct bpf_insn_access_aux *info)
  8914	{
  8915		struct btf *btf;
  8916	
  8917		if (off < 0 || off >= sizeof(struct bpf_qdisc_ctx))
  8918			return false;
  8919	
  8920		switch (off) {
  8921		case offsetof(struct bpf_qdisc_ctx, skb):
  8922			if (type == BPF_WRITE ||
  8923			    size != sizeof_field(struct bpf_qdisc_ctx, skb))
  8924				return false;
  8925	
  8926			if (prog->expected_attach_type != BPF_QDISC_ENQUEUE)
  8927				return false;
  8928	
> 8929			btf = bpf_get_btf_vmlinux();
  8930			if (IS_ERR_OR_NULL(btf))
  8931				return false;
  8932	
  8933			info->btf = btf;
  8934			info->btf_id = tc_qdisc_ctx_access_btf_ids[0];
  8935			info->reg_type = PTR_TO_BTF_ID | PTR_TRUSTED;
  8936			return true;
  8937		case bpf_ctx_range(struct bpf_qdisc_ctx, classid):
  8938			return size == sizeof_field(struct bpf_qdisc_ctx, classid);
  8939		case bpf_ctx_range(struct bpf_qdisc_ctx, expire):
  8940			return size == sizeof_field(struct bpf_qdisc_ctx, expire);
  8941		case bpf_ctx_range(struct bpf_qdisc_ctx, delta_ns):
  8942			return size == sizeof_field(struct bpf_qdisc_ctx, delta_ns);
  8943		default:
  8944			return false;
  8945		}
  8946	
  8947		return false;
  8948	}
  8949	

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