tree: https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git queue-next head: 12481f34a10b2cffb9ac5bf6a5e484f3c70e6ce0 commit: 32273a839846aa8d6d184ba8084796bc4b43f6f6 [1924/1997] netfilter: flowtable: Add FLOW_OFFLOAD_XMIT_UNSPEC xmit type config: x86_64-randconfig-a014-20210421 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d87b9b81ccb95217181ce75515c6c68bbb408ca4) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/commit... git remote add mellanox https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git git fetch --no-tags mellanox queue-next git checkout 32273a839846aa8d6d184ba8084796bc4b43f6f6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): switch (route->tuple[dir].xmit_type) { ^ 1 warning generated. vim +/FLOW_OFFLOAD_XMIT_UNSPEC +116 net/netfilter/nf_flow_table_core.c 8b9229d15877ec Pablo Neira Ayuso 2021-03-28 88 f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 89 static int flow_offload_fill_route(struct flow_offload *flow, f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 90 const struct nf_flow_route *route, f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 91 enum flow_offload_tuple_dir dir) f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 92 { f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 93 struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 94 struct dst_entry *dst = route->tuple[dir].dst; 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 95 int i, j = 0; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 96 f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 97 switch (flow_tuple->l3proto) { f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 98 case NFPROTO_IPV4: f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 99 flow_tuple->mtu = ip_dst_mtu_maybe_forward(dst, true); f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 100 break; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 101 case NFPROTO_IPV6: f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 102 flow_tuple->mtu = ip6_dst_mtu_forward(dst); f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 103 break; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 104 } f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 105 c63a7cc4d795c0 Pablo Neira Ayuso 2021-03-24 106 flow_tuple->iifidx = route->tuple[dir].in.ifindex; 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 107 for (i = route->tuple[dir].in.num_encaps - 1; i >= 0; i--) { 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 108 flow_tuple->encap[j].id = route->tuple[dir].in.encap[i].id; 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 109 flow_tuple->encap[j].proto = route->tuple[dir].in.encap[i].proto; 26267bf9bb57d5 Felix Fietkau 2021-03-24 110 if (route->tuple[dir].in.ingress_vlans & BIT(i)) 26267bf9bb57d5 Felix Fietkau 2021-03-24 111 flow_tuple->in_vlan_ingress |= BIT(j); 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 112 j++; 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 113 } 4cd91f7c290f64 Pablo Neira Ayuso 2021-03-24 114 flow_tuple->encap_num = route->tuple[dir].in.num_encaps; 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 115 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 @116 switch (route->tuple[dir].xmit_type) { 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 117 case FLOW_OFFLOAD_XMIT_DIRECT: 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 118 memcpy(flow_tuple->out.h_dest, route->tuple[dir].out.h_dest, 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 119 ETH_ALEN); 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 120 memcpy(flow_tuple->out.h_source, route->tuple[dir].out.h_source, 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 121 ETH_ALEN); 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 122 flow_tuple->out.ifidx = route->tuple[dir].out.ifindex; 73f97025a972cd Pablo Neira Ayuso 2021-03-24 123 flow_tuple->out.hw_ifidx = route->tuple[dir].out.hw_ifindex; 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 124 break; 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 125 case FLOW_OFFLOAD_XMIT_XFRM: 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 126 case FLOW_OFFLOAD_XMIT_NEIGH: 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 127 if (!dst_hold_safe(route->tuple[dir].dst)) 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 128 return -1; 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 129 f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 130 flow_tuple->dst_cache = dst; 8b9229d15877ec Pablo Neira Ayuso 2021-03-28 131 flow_tuple->dst_cookie = flow_offload_dst_cookie(flow_tuple); 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 132 break; 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 133 } 7a27f6ab41356e Pablo Neira Ayuso 2021-03-24 134 flow_tuple->xmit_type = route->tuple[dir].xmit_type; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 135 f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 136 return 0; f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 137 } f1363e058b84e6 Pablo Neira Ayuso 2019-11-12 138 :::::: The code at line 116 was first introduced by commit :::::: 7a27f6ab41356ecba47ec2bec6d635704c169779 netfilter: flowtable: use dev_fill_forward_path() to obtain egress device :::::: TO: Pablo Neira Ayuso <pablo(a)netfilter.org&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org