Hi Toke,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/xdp-Always-use-a-devmap-for-XDP_REDIRECT-to-a-device/20190224-054907
config: i386-randconfig-l1-02240344 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net//core/filter.c: In function '__bpf_tx_xdp_map':
>> net//core/filter.c:3355:29: error: passing argument 2 of '__dev_map_insert_ctx' from incompatible pointer type [-Werror=incompatible-pointer-types]
      __dev_map_insert_ctx(map, dst);
                                ^
   In file included from include/linux/bpf-cgroup.h:5:0,
                    from include/linux/cgroup-defs.h:22,
                    from include/linux/cgroup.h:28,
                    from include/net/netprio_cgroup.h:17,
                    from include/linux/netdevice.h:46,
                    from include/net/sock.h:51,
                    from include/linux/sock_diag.h:8,
                    from net//core/filter.c:29:
   include/linux/bpf.h:715:20: note: expected 'struct net_device *' but argument is of type 'struct bpf_dtab_netdev *'
    static inline void __dev_map_insert_ctx(struct bpf_map *map,
                       ^
   cc1: some warnings being treated as errors

vim +/__dev_map_insert_ctx +3355 net//core/filter.c

  3339	
  3340	static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
  3341				    struct bpf_map *map,
  3342				    struct xdp_buff *xdp,
  3343				    u32 index)
  3344	{
  3345		int err;
  3346	
  3347		switch (map->map_type) {
  3348		case BPF_MAP_TYPE_DEVMAP:
  3349		case BPF_MAP_TYPE_DEVMAP_IDX: {
  3350			struct bpf_dtab_netdev *dst = fwd;
  3351	
  3352			err = dev_map_enqueue(dst, xdp, dev_rx);
  3353			if (unlikely(err))
  3354				return err;
> 3355			__dev_map_insert_ctx(map, dst);
  3356			break;
  3357		}
  3358		case BPF_MAP_TYPE_CPUMAP: {
  3359			struct bpf_cpu_map_entry *rcpu = fwd;
  3360	
  3361			err = cpu_map_enqueue(rcpu, xdp, dev_rx);
  3362			if (unlikely(err))
  3363				return err;
  3364			__cpu_map_insert_ctx(map, index);
  3365			break;
  3366		}
  3367		case BPF_MAP_TYPE_XSKMAP: {
  3368			struct xdp_sock *xs = fwd;
  3369	
  3370			err = __xsk_map_redirect(map, xdp, xs);
  3371			return err;
  3372		}
  3373		default:
  3374			break;
  3375		}
  3376		return 0;
  3377	}
  3378	

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