Re: [PATCH net v6 2/2] virtio-net: correct hdr_len handling for tunnel gso

[kernel test robot <lkp@intel.com>]

Hi Xuan,

kernel test robot noticed the following build errors:

[auto build test ERROR on net/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Xuan-Zhuo/virtio-net-correct-hdr_len-handling-for-VIRTIO_NET_F_GUEST_HDRLEN/20251119-135650
base:   net/main
patch link:    https://lore.kernel.org/r/20251119055522.617-3-xuanzhuo%40linux.alibaba.com
patch subject: [PATCH net v6 2/2] virtio-net: correct hdr_len handling for tunnel gso
config: arm-jornada720_defconfig (https://download.01.org/0day-ci/archive/20251120/202511200817.29vdvG8S-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251120/202511200817.29vdvG8S-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511200817.29vdvG8S-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from net/packet/af_packet.c:86:
>> include/linux/virtio_net.h:218:7: error: use of undeclared identifier 'sinfo'
     218 |                 if (sinfo->gso_type & (SKB_GSO_UDP_TUNNEL |
         |                     ^~~~~
   1 error generated.


vim +/sinfo +218 include/linux/virtio_net.h

   209	
   210	static inline void virtio_net_set_hdrlen(const struct sk_buff *skb,
   211						 struct virtio_net_hdr *hdr,
   212						 bool little_endian,
   213						 bool guest_hdrlen)
   214	{
   215		u16 hdr_len;
   216	
   217		if (guest_hdrlen) {
 > 218			if (sinfo->gso_type & (SKB_GSO_UDP_TUNNEL |
   219					       SKB_GSO_UDP_TUNNEL_CSUM)) {
   220				hdr_len = skb_inner_transport_offset(skb);
   221	
   222				if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP_L4)
   223					hdr_len += sizeof(struct udphdr);
   224				else
   225					hdr_len += inner_tcp_hdrlen(skb);
   226			} else {
   227				hdr_len = skb_transport_offset(skb);
   228	
   229				if (hdr->gso_type == VIRTIO_NET_HDR_GSO_UDP_L4)
   230					hdr_len += sizeof(struct udphdr);
   231				else
   232					hdr_len += tcp_hdrlen(skb);
   233			}
   234		} else {
   235			/* This is a hint as to how much should be linear. */
   236			hdr_len = skb_headlen(skb);
   237		}
   238	
   239		hdr->hdr_len = __cpu_to_virtio16(little_endian, hdr_len);
   240	}
   241	

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