Hi Toshiaki,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Toshiaki-Makita/veth-Driver-XDP/20180724-065517
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-x001-201829 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from include/linux/kernel.h:10:0,
                    from include/linux/list.h:9,
                    from include/linux/timer.h:5,
                    from include/linux/netdevice.h:28,
                    from drivers//net/veth.c:11:
   drivers//net/veth.c: In function 'veth_xdp_xmit':

quoted

drivers//net/veth.c:300:16: error: implicit declaration of function 'xdp_ok_fwd_dev' [-Werror=implicit-function-declaration]

      if (unlikely(xdp_ok_fwd_dev(rcv, frame->len) ||
                   ^
   include/linux/compiler.h:77:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
   cc1: some warnings being treated as errors

vim +/xdp_ok_fwd_dev +300 drivers//net/veth.c

   275	
   276	static int veth_xdp_xmit(struct net_device *dev, int n,
   277				 struct xdp_frame **frames, u32 flags)
   278	{
   279		struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
   280		struct net_device *rcv;
   281		int i, drops = 0;
   282	
   283		if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
   284			return -EINVAL;
   285	
   286		rcv = rcu_dereference(priv->peer);
   287		if (unlikely(!rcv))
   288			return -ENXIO;
   289	
   290		rcv_priv = netdev_priv(rcv);
   291		/* xdp_ring is initialized on receive side? */
   292		if (!rcu_access_pointer(rcv_priv->xdp_prog))
   293			return -ENXIO;
   294	
   295		spin_lock(&rcv_priv->xdp_ring.producer_lock);
   296		for (i = 0; i < n; i++) {
   297			struct xdp_frame *frame = frames[i];
   298			void *ptr = veth_xdp_to_ptr(frame);
   299	
 > 300			if (unlikely(xdp_ok_fwd_dev(rcv, frame->len) ||
   301				     __ptr_ring_produce(&rcv_priv->xdp_ring, ptr))) {
   302				xdp_return_frame_rx_napi(frame);
   303				drops++;
   304			}
   305		}
   306		spin_unlock(&rcv_priv->xdp_ring.producer_lock);
   307	
   308		if (flags & XDP_XMIT_FLUSH)
   309			__veth_xdp_flush(rcv_priv);
   310	
   311		return n - drops;
   312	}
   313	

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