netdev - Re: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh

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Date: Tue, 9 Jan 2024 13:38:00 +0800
From: kernel test robot <lkp@...el.com>
To: Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel@...nvz.org,
	Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
Subject: Re: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh

Hi Pavel,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]
[also build test WARNING on net/main linus/master horms-ipvs/master v6.7 next-20240108]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Pavel-Tikhomirov/neighbour-purge-nf_bridged-skb-from-foreign-device-neigh/20240108-165551
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240108085232.95437-1-ptikhomirov%40virtuozzo.com
patch subject: [PATCH] neighbour: purge nf_bridged skb from foreign device neigh
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240109/202401091351.CqYRoau7-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240109/202401091351.CqYRoau7-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401091351.CqYRoau7-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/core/neighbour.c: In function 'neigh_purge_nf_bridge_dev':
   net/core/neighbour.c:392:29: error: implicit declaration of function 'nf_bridge_info_get' [-Werror=implicit-function-declaration]
     392 |                 nf_bridge = nf_bridge_info_get(skb);
         |                             ^~~~~~~~~~~~~~~~~~
>> net/core/neighbour.c:392:27: warning: assignment to 'struct nf_bridge_info *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     392 |                 nf_bridge = nf_bridge_info_get(skb);
         |                           ^
   net/core/neighbour.c:395:43: error: invalid use of undefined type 'struct nf_bridge_info'
     395 |                 if (nf_bridge && nf_bridge->physindev == dev) {
         |                                           ^~
   cc1: some warnings being treated as errors


vim +392 net/core/neighbour.c

   382	
   383	static void neigh_purge_nf_bridge_dev(struct neighbour *neigh, struct net_device *dev)
   384	{
   385		struct sk_buff_head *list = &neigh->arp_queue;
   386		struct nf_bridge_info *nf_bridge;
   387		struct sk_buff *skb, *next;
   388	
   389		write_lock(&neigh->lock);
   390		skb = skb_peek(list);
   391		while (skb) {
 > 392			nf_bridge = nf_bridge_info_get(skb);
   393	
   394			next = skb_peek_next(skb, list);
   395			if (nf_bridge && nf_bridge->physindev == dev) {
   396				__skb_unlink(skb, list);
   397				neigh->arp_queue_len_bytes -= skb->truesize;
   398				kfree_skb(skb);
   399			}
   400			skb = next;
   401		}
   402		write_unlock(&neigh->lock);
   403	}
   404	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki