Re: [PATCH net v2] ipvs: fix MTU check for GSO packets in tunnel mode

[kernel test robot]

Hi Yingnan,

kernel test robot noticed the following build errors:

[auto build test ERROR on net/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Yingnan-Zhang/ipvs-fix-MTU-check-for-GSO-packets-in-tunnel-mode/20260407-141549
base:   net/main
patch link:    https://lore.kernel.org/r/tencent_CA2C1C219C99D315086BE55E8654AF7E6009%40qq.com
patch subject: [PATCH net v2] ipvs: fix MTU check for GSO packets in tunnel mode
config: x86_64-rhel-9.4-ltp (https://download.01.org/0day-ci/archive/20260407/202604071309.RskiawHA-lkp@xxxxxxxxx/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260407/202604071309.RskiawHA-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604071309.RskiawHA-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

>> net/netfilter/ipvs/ip_vs_xmit.c:115:11: error: expected identifier or '(' before 'else'
     115 |         } else if (skb->len > mtu &&
         |           ^~~~
>> net/netfilter/ipvs/ip_vs_xmit.c:119:9: error: expected identifier or '(' before 'return'
     119 |         return false;
         |         ^~~~~~
>> net/netfilter/ipvs/ip_vs_xmit.c:120:1: error: expected identifier or '(' before '}' token
     120 | }
         | ^
   net/netfilter/ipvs/ip_vs_xmit.c: In function '__mtu_check_toobig_v6':
>> net/netfilter/ipvs/ip_vs_xmit.c:115:9: warning: control reaches end of non-void function [-Wreturn-type]
     115 |         } else if (skb->len > mtu &&
         |         ^


vim +115 net/netfilter/ipvs/ip_vs_xmit.c

   104	
   105	static inline bool
   106	__mtu_check_toobig_v6(const struct sk_buff *skb, u32 mtu)
   107	{
   108		if (IP6CB(skb)->frag_max_size) {
   109			/* frag_max_size tell us that, this packet have been
   110			 * defragmented by netfilter IPv6 conntrack module.
   111			 */
   112			if (IP6CB(skb)->frag_max_size > mtu)
   113				return true; /* largest fragment violate MTU */
   114		}
 > 115		} else if (skb->len > mtu &&
   116			   !(skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))) {
   117			return true; /* Packet size violate MTU size */
   118		}
 > 119		return false;
 > 120	}
   121	

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