tree:   https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-01
head:   6b5756c44933d2b55e5e59e1196ef95894203cf7
commit: b8d0d0f924c237daf55b430a85007bd41ad01d7e [1/3] Add a PIFO map type for queueing packets
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://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git/commit/?id=b8d0d0f924c237daf55b430a85007bd41ad01d7e
        git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git
        git fetch --no-tags toke xdp-queueing-01
        git checkout b8d0d0f924c237daf55b430a85007bd41ad01d7e
        # 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 <lkp@intel.com>

All errors (new ones prefixed by >>):

   net/core/filter.c: In function 'xdp_do_redirect':
>> net/core/filter.c:3984:10: error: implicit declaration of function 'pifo_map_enqueue'; did you mean 'cpu_map_enqueue'? [-Werror=implicit-function-declaration]
    3984 |    err = pifo_map_enqueue(map, xdp, ri->tgt_index);
         |          ^~~~~~~~~~~~~~~~
         |          cpu_map_enqueue
   cc1: some warnings being treated as errors


vim +3984 net/core/filter.c

  3952	
  3953	int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
  3954			    struct bpf_prog *xdp_prog)
  3955	{
  3956		struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
  3957		enum bpf_map_type map_type = ri->map_type;
  3958		void *fwd = ri->tgt_value;
  3959		u32 map_id = ri->map_id;
  3960		struct bpf_map *map;
  3961		int err;
  3962	
  3963		ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */
  3964		ri->map_type = BPF_MAP_TYPE_UNSPEC;
  3965	
  3966		switch (map_type) {
  3967		case BPF_MAP_TYPE_DEVMAP:
  3968			fallthrough;
  3969		case BPF_MAP_TYPE_DEVMAP_HASH:
  3970			map = READ_ONCE(ri->map);
  3971			if (unlikely(map)) {
  3972				WRITE_ONCE(ri->map, NULL);
  3973				err = dev_map_enqueue_multi(xdp, dev, map,
  3974							    ri->flags & BPF_F_EXCLUDE_INGRESS);
  3975			} else {
  3976				err = dev_map_enqueue(fwd, xdp, dev);
  3977			}
  3978			break;
  3979		case BPF_MAP_TYPE_PIFO:
  3980			map = READ_ONCE(ri->map);
  3981			if (unlikely(!map))
  3982				err = -EINVAL;
  3983			else
> 3984				err = pifo_map_enqueue(map, xdp, ri->tgt_index);
  3985			break;
  3986		case BPF_MAP_TYPE_CPUMAP:
  3987			err = cpu_map_enqueue(fwd, xdp, dev);
  3988			break;
  3989		case BPF_MAP_TYPE_XSKMAP:
  3990			err = __xsk_map_redirect(fwd, xdp);
  3991			break;
  3992		case BPF_MAP_TYPE_UNSPEC:
  3993			if (map_id == INT_MAX) {
  3994				fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index);
  3995				if (unlikely(!fwd)) {
  3996					err = -EINVAL;
  3997					break;
  3998				}
  3999				err = dev_xdp_enqueue(fwd, xdp, dev);
  4000				break;
  4001			}
  4002			fallthrough;
  4003		default:
  4004			err = -EBADRQC;
  4005		}
  4006	
  4007		if (unlikely(err))
  4008			goto err;
  4009	
  4010		_trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index);
  4011		return 0;
  4012	err:
  4013		_trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err);
  4014		return err;
  4015	}
  4016	EXPORT_SYMBOL_GPL(xdp_do_redirect);
  4017	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org