netdev - [net-next:master 56/77] net/core/filter.c:2475: undefined reference to `__dev_map

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Message-ID: <201707180727.AVLbjxqL%fengguang.wu@intel.com>
Date:   Tue, 18 Jul 2017 07:43:30 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: [net-next:master 56/77] net/core/filter.c:2475: undefined reference
 to `__dev_map_flush'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   24251c264798ac5a72667245c2650676d7ac2108
commit: 11393cc9b9be2a1f61559e6fb9c27bc8fa20b1ff [56/77] xdp: Add batching support to redirect map
config: m32r-opsput_defconfig (attached as .config)
compiler: m32r-linux-gcc (GCC) 6.2.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 11393cc9b9be2a1f61559e6fb9c27bc8fa20b1ff
        # save the attached .config to linux build tree
        make.cross ARCH=m32r 

All errors (new ones prefixed by >>):

   net/core/filter.o: In function `xdp_do_flush_map':
>> net/core/filter.c:2475: undefined reference to `__dev_map_flush'
   net/core/filter.c:2475:(.text+0x24f0): relocation truncated to fit: R_M32R_26_PCREL_RELA against undefined symbol `__dev_map_flush'
   net/core/filter.o: In function `__bpf_tx_xdp':
>> net/core/filter.c:2459: undefined reference to `__dev_map_insert_ctx'
   net/core/filter.c:2459:(.text+0x4528): relocation truncated to fit: R_M32R_26_PCREL_RELA against undefined symbol `__dev_map_insert_ctx'
   net/core/filter.o: In function `xdp_do_redirect_map':
>> net/core/filter.c:2491: undefined reference to `__dev_map_lookup_elem'
   net/core/filter.c:2491:(.text+0x4c5c): relocation truncated to fit: R_M32R_26_PCREL_RELA against undefined symbol `__dev_map_lookup_elem'
   net/core/filter.o: In function `xdp_do_flush_map':
>> net/core/filter.c:2475: undefined reference to `__dev_map_flush'
   net/core/filter.c:2475:(.text+0x4c7c): relocation truncated to fit: R_M32R_26_PCREL_RELA against undefined symbol `__dev_map_flush'

vim +2475 net/core/filter.c

  2441	
  2442	static int __bpf_tx_xdp(struct net_device *dev,
  2443				struct bpf_map *map,
  2444				struct xdp_buff *xdp,
  2445				u32 index)
  2446	{
  2447		int err;
  2448	
  2449		if (!dev->netdev_ops->ndo_xdp_xmit) {
  2450			bpf_warn_invalid_xdp_redirect(dev->ifindex);
  2451			return -EOPNOTSUPP;
  2452		}
  2453	
  2454		err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
  2455		if (err)
  2456			return err;
  2457	
  2458		if (map)
> 2459			__dev_map_insert_ctx(map, index);
  2460		else
  2461			dev->netdev_ops->ndo_xdp_flush(dev);
  2462	
  2463		return err;
  2464	}
  2465	
  2466	void xdp_do_flush_map(void)
  2467	{
  2468		struct redirect_info *ri = this_cpu_ptr(&redirect_info);
  2469		struct bpf_map *map = ri->map_to_flush;
  2470	
  2471		ri->map = NULL;
  2472		ri->map_to_flush = NULL;
  2473	
  2474		if (map)
> 2475			__dev_map_flush(map);
  2476	}
  2477	EXPORT_SYMBOL_GPL(xdp_do_flush_map);
  2478	
  2479	int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
  2480				struct bpf_prog *xdp_prog)
  2481	{
  2482		struct redirect_info *ri = this_cpu_ptr(&redirect_info);
  2483		struct bpf_map *map = ri->map;
  2484		u32 index = ri->ifindex;
  2485		struct net_device *fwd;
  2486		int err = -EINVAL;
  2487	
  2488		ri->ifindex = 0;
  2489		ri->map = NULL;
  2490	
> 2491		fwd = __dev_map_lookup_elem(map, index);
  2492		if (!fwd)
  2493			goto out;
  2494	
  2495		if (ri->map_to_flush && (ri->map_to_flush != map))
  2496			xdp_do_flush_map();
  2497	
  2498		err = __bpf_tx_xdp(fwd, map, xdp, index);
  2499		if (likely(!err))
  2500			ri->map_to_flush = map;
  2501	
  2502	out:
  2503		trace_xdp_redirect(dev, fwd, xdp_prog, XDP_REDIRECT);
  2504		return err;
  2505	}
  2506	

---
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