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Date: Thu, 23 May 2024 22:22:44 +0800
From: kernel test robot <lkp@...el.com>
To: Vadim Fedorenko <vadfed@...a.com>,
Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Andrii Nakryiko <andrii@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Mykola Lysenko <mykolal@...com>, Jakub Kicinski <kuba@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, bpf@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/2] bpf: add CHECKSUM_COMPLETE to bpf test progs
Hi Vadim,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Vadim-Fedorenko/selftests-bpf-validate-CHECKSUM_COMPLETE-option/20240522-225856
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20240522145712.3523593-1-vadfed%40meta.com
patch subject: [PATCH bpf-next 1/2] bpf: add CHECKSUM_COMPLETE to bpf test progs
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240523/202405232220.e9PuO2yW-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240523/202405232220.e9PuO2yW-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/202405232220.e9PuO2yW-lkp@intel.com/
All warnings (new ones prefixed by >>):
net/bpf/test_run.c: In function 'bpf_prog_test_run_skb':
>> net/bpf/test_run.c:978:17: warning: unused variable 'sum' [-Wunused-variable]
978 | __sum16 sum;
| ^~~
vim +/sum +978 net/bpf/test_run.c
963
964 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
965 union bpf_attr __user *uattr)
966 {
967 bool is_l2 = false, is_direct_pkt_access = false;
968 struct net *net = current->nsproxy->net_ns;
969 struct net_device *dev = net->loopback_dev;
970 u32 size = kattr->test.data_size_in;
971 u32 repeat = kattr->test.repeat;
972 struct __sk_buff *ctx = NULL;
973 u32 retval, duration;
974 int hh_len = ETH_HLEN;
975 struct sk_buff *skb;
976 struct sock *sk;
977 __wsum csum;
> 978 __sum16 sum;
979 void *data;
980 int ret;
981
982 if ((kattr->test.flags & ~BPF_F_TEST_SKB_CHECKSUM_COMPLETE) ||
983 kattr->test.cpu || kattr->test.batch_size)
984 return -EINVAL;
985
986 data = bpf_test_init(kattr, kattr->test.data_size_in,
987 size, NET_SKB_PAD + NET_IP_ALIGN,
988 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
989 if (IS_ERR(data))
990 return PTR_ERR(data);
991
992 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
993 if (IS_ERR(ctx)) {
994 kfree(data);
995 return PTR_ERR(ctx);
996 }
997
998 switch (prog->type) {
999 case BPF_PROG_TYPE_SCHED_CLS:
1000 case BPF_PROG_TYPE_SCHED_ACT:
1001 is_l2 = true;
1002 fallthrough;
1003 case BPF_PROG_TYPE_LWT_IN:
1004 case BPF_PROG_TYPE_LWT_OUT:
1005 case BPF_PROG_TYPE_LWT_XMIT:
1006 is_direct_pkt_access = true;
1007 break;
1008 default:
1009 break;
1010 }
1011
1012 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
1013 if (!sk) {
1014 kfree(data);
1015 kfree(ctx);
1016 return -ENOMEM;
1017 }
1018 sock_init_data(NULL, sk);
1019
1020 skb = slab_build_skb(data);
1021 if (!skb) {
1022 kfree(data);
1023 kfree(ctx);
1024 sk_free(sk);
1025 return -ENOMEM;
1026 }
1027 skb->sk = sk;
1028
1029 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1030 __skb_put(skb, size);
1031
1032 if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
1033 skb->csum = skb_checksum(skb, 0, skb->len, 0);
1034 skb->ip_summed = CHECKSUM_COMPLETE;
1035 }
1036
1037 if (ctx && ctx->ifindex > 1) {
1038 dev = dev_get_by_index(net, ctx->ifindex);
1039 if (!dev) {
1040 ret = -ENODEV;
1041 goto out;
1042 }
1043 }
1044 skb->protocol = eth_type_trans(skb, dev);
1045 skb_reset_network_header(skb);
1046
1047 switch (skb->protocol) {
1048 case htons(ETH_P_IP):
1049 sk->sk_family = AF_INET;
1050 if (sizeof(struct iphdr) <= skb_headlen(skb)) {
1051 sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
1052 sk->sk_daddr = ip_hdr(skb)->daddr;
1053 }
1054 break;
1055 #if IS_ENABLED(CONFIG_IPV6)
1056 case htons(ETH_P_IPV6):
1057 sk->sk_family = AF_INET6;
1058 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
1059 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
1060 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
1061 }
1062 break;
1063 #endif
1064 default:
1065 break;
1066 }
1067
1068 if (is_l2)
1069 __skb_push(skb, hh_len);
1070 if (is_direct_pkt_access)
1071 bpf_compute_data_pointers(skb);
1072 ret = convert___skb_to_skb(skb, ctx);
1073 if (ret)
1074 goto out;
1075 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
1076 if (ret)
1077 goto out;
1078 if (!is_l2) {
1079 if (skb_headroom(skb) < hh_len) {
1080 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
1081
1082 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
1083 ret = -ENOMEM;
1084 goto out;
1085 }
1086 }
1087 memset(__skb_push(skb, hh_len), 0, hh_len);
1088 }
1089 convert_skb_to___skb(skb, ctx);
1090
1091 if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
1092 csum = skb_checksum(skb, 0, skb->len, 0);
1093 if (skb->csum != csum) {
1094 ret = -EINVAL;
1095 goto out;
1096 }
1097 }
1098
1099 size = skb->len;
1100 /* bpf program can never convert linear skb to non-linear */
1101 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
1102 size = skb_headlen(skb);
1103 ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
1104 duration);
1105 if (!ret)
1106 ret = bpf_ctx_finish(kattr, uattr, ctx,
1107 sizeof(struct __sk_buff));
1108 out:
1109 if (dev && dev != net->loopback_dev)
1110 dev_put(dev);
1111 kfree_skb(skb);
1112 sk_free(sk);
1113 kfree(ctx);
1114 return ret;
1115 }
1116
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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