Re: [PATCH RFC bpf-next v2 09/17] trait: Store traits in sk_buff extension

[kernel test robot <lkp@intel.com>]

Hi Arthur,

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

[auto build test ERROR on 5709be4c35ba760b001733939e20069de033a697]

url:    https://github.com/intel-lab-lkp/linux/commits/Arthur-Fabre/trait-limited-KV-store-for-packet-metadata/20250422-212907
base:   5709be4c35ba760b001733939e20069de033a697
patch link:    https://lore.kernel.org/r/20250422-afabre-traits-010-rfc2-v2-9-92bcc6b146c9%40arthurfabre.com
patch subject: [PATCH RFC bpf-next v2 09/17] trait: Store traits in sk_buff extension
config: i386-buildonly-randconfig-001-20250423 (https://download.01.org/0day-ci/archive/20250423/202504231243.flI74qPm-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250423/202504231243.flI74qPm-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/202504231243.flI74qPm-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/net/busy_poll.h:19,
                    from io_uring/napi.h:8,
                    from io_uring/io_uring.c:96:
   include/net/xdp.h: In function '__xdp_flags_update_skb':
>> include/net/xdp.h:133:17: error: implicit declaration of function 'skb_ext_from_headroom'; did you mean 'skb_realloc_headroom'? [-Werror=implicit-function-declaration]
     133 |                 skb_ext_from_headroom(skb, SKB_EXT_TRAITS, _XDP_FRAME_SIZE, traits_size(traits));
         |                 ^~~~~~~~~~~~~~~~~~~~~
         |                 skb_realloc_headroom
>> include/net/xdp.h:133:44: error: 'SKB_EXT_TRAITS' undeclared (first use in this function)
     133 |                 skb_ext_from_headroom(skb, SKB_EXT_TRAITS, _XDP_FRAME_SIZE, traits_size(traits));
         |                                            ^~~~~~~~~~~~~~
   include/net/xdp.h:133:44: note: each undeclared identifier is reported only once for each function it appears in
   In file included from include/linux/container_of.h:5,
                    from include/linux/kernel.h:22,
                    from io_uring/io_uring.c:42:
   include/net/xdp.h: At top level:
   include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct xdp_frame) == _XDP_FRAME_SIZE"
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^~~~~~~~~~~~~~
   include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^~~~~~~~~~~~~~~
   include/net/xdp.h:303:1: note: in expansion of macro 'static_assert'
     303 | static_assert(sizeof(struct xdp_frame) == _XDP_FRAME_SIZE);
         | ^~~~~~~~~~~~~
   cc1: note: unrecognized command-line option '-Wno-unterminated-string-initialization' may have been intended to silence earlier diagnostics
   cc1: some warnings being treated as errors


vim +133 include/net/xdp.h

   129	
   130	static __always_inline void __xdp_flags_update_skb(u32 flags, struct sk_buff *skb, void *traits)
   131	{
   132		if (flags & XDP_FLAGS_TRAITS_SUPPORTED)
 > 133			skb_ext_from_headroom(skb, SKB_EXT_TRAITS, _XDP_FRAME_SIZE, traits_size(traits));
   134	}
   135	

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