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selftests/bpf: mark dynptr kfuncs __weak to make them optional on old kernels

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Mark dynptr kfuncs as __weak to allow
verifier_global_subprogs/arg_ctx_{perf,kprobe,raw_tp} subtests to be
loadable on old kernels. Because bpf_dynptr_from_xdp() kfunc is used
from arg_tag_dynptr BPF program in progs/verifier_global_subprogs.c
*and* is not marked as __weak, loading any subtest from
verifier_global_subprogs fails on old kernels that don't have
bpf_dynptr_from_xdp() kfunc defined. Even if arg_tag_dynptr program
itself is not loaded, libbpf bails out on non-weak reference to
bpf_dynptr_from_xdp (that can't be resolved), which shared across all
programs in progs/verifier_global_subprogs.c.

So mark all dynptr-related kfuncs as __weak to unblock libbpf CI ([0]).
In the upcoming "kfunc in vmlinux.h" work we should make sure that
kfuncs are always declared __weak as well.

  [0] https://github.com/libbpf/libbpf/actions/runs/7792673215/job/21251250831?pr=776#step:4:7961

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240206004008.1541513-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2024-02-05 16:40:08 -08:00 committed by Alexei Starovoitov
parent d7bc416aa5
commit c7dcb6c9aa
1 changed files with 9 additions and 9 deletions
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18
tools/testing/selftests/bpf/bpf_kfuncs.h
View file

@ -9,7 +9,7 @@ struct bpf_sock_addr_kern;
* Error code
*/
extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags,
struct bpf_dynptr *ptr__uninit) __ksym;
struct bpf_dynptr *ptr__uninit) __ksym __weak;
/* Description
* Initializes an xdp-type dynptr
@ -17,7 +17,7 @@ extern int bpf_dynptr_from_skb(struct __sk_buff *skb, __u64 flags,
* Error code
*/
extern int bpf_dynptr_from_xdp(struct xdp_md *xdp, __u64 flags,
struct bpf_dynptr *ptr__uninit) __ksym;
struct bpf_dynptr *ptr__uninit) __ksym __weak;
/* Description
* Obtain a read-only pointer to the dynptr's data
@ -26,7 +26,7 @@ extern int bpf_dynptr_from_xdp(struct xdp_md *xdp, __u64 flags,
* buffer if unable to obtain a direct pointer
*/
extern void *bpf_dynptr_slice(const struct bpf_dynptr *ptr, __u32 offset,
void *buffer, __u32 buffer__szk) __ksym;
void *buffer, __u32 buffer__szk) __ksym __weak;
/* Description
* Obtain a read-write pointer to the dynptr's data
@ -35,13 +35,13 @@ extern void *bpf_dynptr_slice(const struct bpf_dynptr *ptr, __u32 offset,
* buffer if unable to obtain a direct pointer
*/
extern void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr *ptr, __u32 offset,
void *buffer, __u32 buffer__szk) __ksym;
void *buffer, __u32 buffer__szk) __ksym __weak;
extern int bpf_dynptr_adjust(const struct bpf_dynptr *ptr, __u32 start, __u32 end) __ksym;
extern bool bpf_dynptr_is_null(const struct bpf_dynptr *ptr) __ksym;
extern bool bpf_dynptr_is_rdonly(const struct bpf_dynptr *ptr) __ksym;
extern __u32 bpf_dynptr_size(const struct bpf_dynptr *ptr) __ksym;
extern int bpf_dynptr_clone(const struct bpf_dynptr *ptr, struct bpf_dynptr *clone__init) __ksym;
extern int bpf_dynptr_adjust(const struct bpf_dynptr *ptr, __u32 start, __u32 end) __ksym __weak;
extern bool bpf_dynptr_is_null(const struct bpf_dynptr *ptr) __ksym __weak;
extern bool bpf_dynptr_is_rdonly(const struct bpf_dynptr *ptr) __ksym __weak;
extern __u32 bpf_dynptr_size(const struct bpf_dynptr *ptr) __ksym __weak;
extern int bpf_dynptr_clone(const struct bpf_dynptr *ptr, struct bpf_dynptr *clone__init) __ksym __weak;
/* Description
* Modify the address of a AF_UNIX sockaddr.