Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on nf/master]

url:    https://github.com/0day-ci/linux/commits/wenxu-ucloud-cn/netfilter-nft_payload-fix-vlan_tpid-get-from-h_vlan_proto/20210402-151443
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git master
config: i386-randconfig-r022-20210402 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/eca110c24cc53cf938a9fc7fcddcc8ebc5a35e68
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review wenxu-ucloud-cn/netfilter-nft_payload-fix-vlan_tpid-get-from-h_vlan_proto/20210402-151443
        git checkout eca110c24cc53cf938a9fc7fcddcc8ebc5a35e68
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   net/netfilter/nft_payload.c: In function 'nft_payload_offload_ll':
>> net/netfilter/nft_payload.c:232:2: error: duplicate case value
     232 |  case offsetof(struct vlan_ethhdr, h_vlan_proto):
         |  ^~~~
   net/netfilter/nft_payload.c:217:2: note: previously used here
     217 |  case offsetof(struct ethhdr, h_proto):
         |  ^~~~


vim +232 net/netfilter/nft_payload.c

   195	
   196	static int nft_payload_offload_ll(struct nft_offload_ctx *ctx,
   197					  struct nft_flow_rule *flow,
   198					  const struct nft_payload *priv)
   199	{
   200		struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
   201	
   202		switch (priv->offset) {
   203		case offsetof(struct ethhdr, h_source):
   204			if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
   205				return -EOPNOTSUPP;
   206	
   207			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
   208					  src, ETH_ALEN, reg);
   209			break;
   210		case offsetof(struct ethhdr, h_dest):
   211			if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
   212				return -EOPNOTSUPP;
   213	
   214			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
   215					  dst, ETH_ALEN, reg);
   216			break;
   217		case offsetof(struct ethhdr, h_proto):
   218			if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
   219				return -EOPNOTSUPP;
   220	
   221			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic,
   222					  n_proto, sizeof(__be16), reg);
   223			nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
   224			break;
   225		case offsetof(struct vlan_ethhdr, h_vlan_TCI):
   226			if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
   227				return -EOPNOTSUPP;
   228	
   229			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
   230					  vlan_tci, sizeof(__be16), reg);
   231			break;
 > 232		case offsetof(struct vlan_ethhdr, h_vlan_proto):
   233			if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
   234				return -EOPNOTSUPP;
   235	
   236			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
   237					  vlan_tpid, sizeof(__be16), reg);
   238			nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
   239			break;
   240		case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr):
   241			if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
   242				return -EOPNOTSUPP;
   243	
   244			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, vlan,
   245					  vlan_tci, sizeof(__be16), reg);
   246			break;
   247		case offsetof(struct vlan_ethhdr, h_vlan_proto) +
   248								sizeof(struct vlan_hdr):
   249			if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
   250				return -EOPNOTSUPP;
   251	
   252			NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, vlan,
   253					  vlan_tpid, sizeof(__be16), reg);
   254			break;
   255		default:
   256			return -EOPNOTSUPP;
   257		}
   258	
   259		return 0;
   260	}
   261	

---
0-DAY CI Kernel Test Service, Intel Corporation
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