On Fri, Jul 19, 2024 at 10:09:35AM -0700, Alexei Starovoitov wrote: > On Fri, Jul 19, 2024 at 8:45 AM Daniel Borkmann <daniel@xxxxxxxxxxxxx> wrote: > > > > Hi Artem, > > > > On 7/18/24 4:31 PM, Artem Savkov wrote: > > > Without CONFIG_NET_FOU bpf selftests are unable to build because of > > > missing definitions. Add ___local versions of struct bpf_fou_encap and > > > enum bpf_fou_encap_type to fix the issue. > > > > > > Signed-off-by: Artem Savkov <asavkov@xxxxxxxxxx> > > > > This breaks BPF CI, ptal: > > > > https://github.com/kernel-patches/bpf/actions/runs/9999691294/job/27641198557 > > > > [...] > > CLNG-BPF [test_maps] btf__core_reloc_existence___wrong_field_defs.bpf.o > > CLNG-BPF [test_maps] verifier_bswap.bpf.o > > CLNG-BPF [test_maps] test_core_reloc_existence.bpf.o > > CLNG-BPF [test_maps] test_global_func8.bpf.o > > CLNG-BPF [test_maps] verifier_bitfield_write.bpf.o > > CLNG-BPF [test_maps] local_storage_bench.bpf.o > > CLNG-BPF [test_maps] verifier_runtime_jit.bpf.o > > CLNG-BPF [test_maps] test_pkt_access.bpf.o > > progs/test_tunnel_kern.c:39:5: error: conflicting types for 'bpf_skb_set_fou_encap' > > 39 | int bpf_skb_set_fou_encap(struct __sk_buff *skb_ctx, > > | ^ > > /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:107714:12: note: previous declaration is here > > 107714 | extern int bpf_skb_set_fou_encap(struct __sk_buff *skb_ctx, struct bpf_fou_encap *encap, int type) __weak __ksym; > > | ^ > > progs/test_tunnel_kern.c:41:5: error: conflicting types for 'bpf_skb_get_fou_encap' > > 41 | int bpf_skb_get_fou_encap(struct __sk_buff *skb_ctx, > > | ^ > > /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:107715:12: note: previous declaration is here > > 107715 | extern int bpf_skb_get_fou_encap(struct __sk_buff *skb_ctx, struct bpf_fou_encap *encap) __weak __ksym; > > | ^ > > CLNG-BPF [test_maps] verifier_typedef.bpf.o > > CLNG-BPF [test_maps] user_ringbuf_fail.bpf.o > > CLNG-BPF [test_maps] verifier_map_in_map.bpf.o > > progs/test_tunnel_kern.c:782:35: error: incompatible pointer types passing 'struct bpf_fou_encap___local *' to parameter of type 'struct bpf_fou_encap *' [-Werror,-Wincompatible-pointer-types] > > 782 | ret = bpf_skb_set_fou_encap(skb, &encap, FOU_BPF_ENCAP_GUE___local); > > | ^~~~~~ > > /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/include/vmlinux.h:107714:83: note: passing argument to parameter 'encap' here > > 107714 | extern int bpf_skb_set_fou_encap(struct __sk_buff *skb_ctx, struct bpf_fou_encap *encap, int type) __weak __ksym; > > It's a good idea to introduce struct bpf_fou_encap___local > for !FOU builds, but kfunc signature needs to stay and > __local variable needs to be type casted to (struct bpf_fou_encap *) > when calling kfunc. Casting won't work as the compiler still have no idea about struct bpf_fou_encap. I think I'll need to fix this by adding '#define BPF_NO_KDUNC_PROTOTYPES' to the test. Daniel has done this for other cases like this in the series introducing bpftool kfunc prototype dumping (https://lore.kernel.org/all/cover.1718207789.git.dxu@xxxxxxxxx/) -- Artem
