Hi Kumar, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/Introduc... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: arc-randconfig-r043-20211210 (https://download.01.org/0day-ci/archive/20211210/202112102230.6cj0WCoX-lk...) compiler: arc-elf-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/683d78cc594f7867b8dae78b357ab82a5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kumar-Kartikeya-Dwivedi/Introduce-unstable-CT-lookup-helpers/20211210-210439 git checkout 683d78cc594f7867b8dae78b357ab82a5ee69484 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash net/netfilter/ 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 >>): 2566 | struct nf_conn *bpf_xdp_ct_lookup(struct xdp_md *xdp_ctx, | ^~~~~~~~~~~~~~~~~ 2610 | struct nf_conn *bpf_skb_ct_lookup(struct __sk_buff *skb_ctx, | ^~~~~~~~~~~~~~~~~ 2648 | void bpf_ct_release(struct nf_conn *nfct) | ^~~~~~~~~~~~~~ vim +/bpf_xdp_ct_lookup +2566 net/netfilter/nf_conntrack_core.c 2549 2550 /* bpf_xdp_ct_lookup - Lookup CT entry for the given tuple, and acquire a 2551 * reference to it 2552 * 2553 * Parameters: 2554 * @xdp_ctx - Pointer to ctx (xdp_md) in XDP program 2555 * Cannot be NULL 2556 * @bpf_tuple - Pointer to memory representing the tuple to look up 2557 * Cannot be NULL 2558 * @len__tuple - Length of the tuple structure 2559 * Must be one of sizeof(bpf_tuple->ipv4) or 2560 * sizeof(bpf_tuple->ipv6) 2561 * @opts - Additional options for lookup (documented above) 2562 * Cannot be NULL 2563 * @len__opts - Length of the bpf_ct_opts structure 2564 * Must be NF_BPF_CT_OPTS_SZ (12) 2565 */ 2567 struct bpf_sock_tuple *bpf_tuple, 2568 u32 len__tuple, struct bpf_ct_opts *opts, 2569 u32 len__opts) 2570 { 2571 struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; 2572 struct net *caller_net; 2573 struct nf_conn *nfct; 2574 2575 BUILD_BUG_ON(sizeof(struct bpf_ct_opts) != NF_BPF_CT_OPTS_SZ); 2576 2577 if (!opts) 2578 return NULL; 2579 if (!bpf_tuple || opts->reserved[0] || opts->reserved[1] || 2580 opts->reserved[2] || len__opts != NF_BPF_CT_OPTS_SZ) { 2581 opts->error = -EINVAL; 2582 return NULL; 2583 } 2584 caller_net = dev_net(ctx->rxq->dev); 2585 nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, len__tuple, opts->l4proto, 2586 opts->netns_id); 2587 if (IS_ERR(nfct)) { 2588 opts->error = PTR_ERR(nfct); 2589 return NULL; 2590 } 2591 return nfct; 2592 } 2593 2594 /* bpf_skb_ct_lookup - Lookup CT entry for the given tuple, and acquire a 2595 * reference to it 2596 * 2597 * Parameters: 2598 * @skb_ctx - Pointer to ctx (__sk_buff) in TC program 2599 * Cannot be NULL 2600 * @bpf_tuple - Pointer to memory representing the tuple to look up 2601 * Cannot be NULL 2602 * @len__tuple - Length of the tuple structure 2603 * Must be one of sizeof(bpf_tuple->ipv4) or 2604 * sizeof(bpf_tuple->ipv6) 2605 * @opts - Additional options for lookup (documented above) 2606 * Cannot be NULL 2607 * @len__opts - Length of the bpf_ct_opts structure 2608 * Must be NF_BPF_CT_OPTS_SZ (12) 2609 */ 2611 struct bpf_sock_tuple *bpf_tuple, 2612 u32 len__tuple, struct bpf_ct_opts *opts, 2613 u32 len__opts) 2614 { 2615 struct sk_buff *skb = (struct sk_buff *)skb_ctx; 2616 struct net *caller_net; 2617 struct nf_conn *nfct; 2618 2619 BUILD_BUG_ON(sizeof(struct bpf_ct_opts) != NF_BPF_CT_OPTS_SZ); 2620 2621 if (!opts) 2622 return NULL; 2623 if (!bpf_tuple || opts->reserved[0] || opts->reserved[1] || 2624 opts->reserved[2] || len__opts != NF_BPF_CT_OPTS_SZ) { 2625 opts->error = -EINVAL; 2626 return NULL; 2627 } 2628 caller_net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); 2629 nfct = __bpf_nf_ct_lookup(caller_net, bpf_tuple, len__tuple, opts->l4proto, 2630 opts->netns_id); 2631 if (IS_ERR(nfct)) { 2632 opts->error = PTR_ERR(nfct); 2633 return NULL; 2634 } 2635 return nfct; 2636 } 2637 2638 /* bpf_ct_release - Release acquired nf_conn object 2639 * 2640 * This must be invoked for referenced PTR_TO_BTF_ID, and the verifier rejects 2641 * the program if any references remain in the program in all of the explored 2642 * states. 2643 * 2644 * Parameters: 2645 * @nf_conn - Pointer to referenced nf_conn object, obtained using 2646 * bpf_xdp_ct_lookup or bpf_skb_ct_lookup. 2647 */ 2649 { 2650 if (!nfct) 2651 return; 2652 nf_ct_put(nfct); 2653 } 2654 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org