Re: [PATCH net-next v6 1/3] net: flow_dissector: extend bpf flow dissector support with vnet hdr

Hi Tanner,

Thank you for the patch! Perhaps something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Tanner-Love/virtio_net-add-optional-flow-dissection-in-virtio_net_hdr_to_skb/20210616-193224
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git c7654495916e109f76a67fd3ae68f8fa70ab4faa
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/7d159f648961a7849f67e1c3d7ecb3d18bf5c7c2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tanner-Love/virtio_net-add-optional-flow-dissection-in-virtio_net_hdr_to_skb/20210616-193224
        git checkout 7d159f648961a7849f67e1c3d7ecb3d18bf5c7c2
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All warnings (new ones prefixed by >>):

quoted

net/core/filter.c:8334:5: warning: no previous prototype for 'check_flow_keys_access' [-Wmissing-prototypes]

    8334 | int check_flow_keys_access(int off, int size, enum bpf_access_type t,
         |     ^~~~~~~~~~~~~~~~~~~~~~


vim +/check_flow_keys_access +8334 net/core/filter.c

  8333	

8334	int check_flow_keys_access(int off, int size, enum bpf_access_type t,

  8335				   struct bpf_insn_access_aux *info)
  8336	{
  8337		if (size < 0 || off < 0 ||
  8338		    (u64)off + size > sizeof(struct bpf_flow_keys))
  8339			return -EACCES;
  8340	
  8341		switch (off) {
  8342		case bpf_ctx_range_ptr(struct bpf_flow_keys, vhdr):
  8343			if (t == BPF_WRITE || off % size != 0 || size != sizeof(__u64))
  8344				return -EACCES;
  8345	
  8346			if (!bpf_flow_dissector_btf_ids[0])
  8347				return -EINVAL;
  8348	
  8349			info->btf_id = bpf_flow_dissector_btf_ids[0];
  8350	
  8351			break;
  8352		case offsetof(struct bpf_flow_keys, vhdr_is_little_endian):
  8353			if (t == BPF_WRITE)
  8354				return -EACCES;
  8355	
  8356			break;
  8357		}
  8358	
  8359		return 0;
  8360	}
  8361	

---
0-DAY CI Kernel Test Service, Intel Corporation
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