Error compiling eBPF C code inside kernel source files
Question
I'm compiling the eBPf programs inside Linux kernel tree , after I run the command sudo make headers_install && sudo make M=samples/bpf , error shows agian. In fact, I'm in stuck here for quite a long time. The first time the error is something wrong with my ubuntu. So I reinstalled it. But now the error is strange.
skeleton/pid_iter.bpf.c:47:14: error: incomplete definition of type 'struct bpf_perf_link'
perf_link = container_of(link, struct bpf_perf_link, link);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_helpers.h:74:22: note: expanded from macro 'container_of'
((type *)(__mptr - offsetof(type, member))); \
^~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_helpers.h:68:60: note: expanded from macro 'offsetof'
#define offsetof(TYPE, MEMBER) ((unsigned long)&((TYPE *)0)->MEMBER)
~~~~~~~~~~~^
skeleton/pid_iter.bpf.c:44:9: note: forward declaration of 'struct bpf_perf_link'
struct bpf_perf_link *perf_link;
^
skeleton/pid_iter.bpf.c:48:10: error: incomplete definition of type 'struct bpf_perf_link'
event = BPF_CORE_READ(perf_link, perf_file, private_data);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:403:2: note: expanded from macro 'BPF_CORE_READ'
___type((src), a, ##__VA_ARGS__) __r; \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:274:29: note: expanded from macro '___type'
#define ___type(...) typeof(___arrow(__VA_ARGS__))
^~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:272:23: note: expanded from macro '___arrow'
#define ___arrow(...) ___apply(___arrow, ___narg(__VA_ARGS__))(__VA_ARGS__)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:223:25: note: expanded from macro '___concat'
#define ___concat(a, b) a ## b
^
<scratch space>:19:1: note: expanded from here
___arrow3
^
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:264:29: note: expanded from macro '___arrow3'
#define ___arrow3(a, b, c) a->b->c
~^
skeleton/pid_iter.bpf.c:44:9: note: forward declaration of 'struct bpf_perf_link'
struct bpf_perf_link *perf_link;
^
skeleton/pid_iter.bpf.c:48:10: error: incomplete definition of type 'struct bpf_perf_link'
event = BPF_CORE_READ(perf_link, perf_file, private_data);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:404:2: note: expanded from macro 'BPF_CORE_READ'
BPF_CORE_READ_INTO(&__r, (src), a, ##__VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:311:2: note: expanded from macro 'BPF_CORE_READ_INTO'
___core_read(bpf_core_read, bpf_core_read, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:302:2: note: expanded from macro '___core_read'
___apply(___core_read, ___empty(__VA_ARGS__))(fn, fn_ptr, dst, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: (skipping 9 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:280:33: note: expanded from macro '___rd_first'
#define ___rd_first(fn, src, a) ___read(fn, &__t, ___type(src), src, a);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:277:59: note: expanded from macro '___read'
read_fn((void *)(dst), sizeof(*(dst)), &((src_type)(src))->accessor)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:206:79: note: expanded from macro 'bpf_core_read'
bpf_probe_read_kernel(dst, sz, (const void *)__builtin_preserve_access_index(src))
^~~
skeleton/pid_iter.bpf.c:44:9: note: forward declaration of 'struct bpf_perf_link'
struct bpf_perf_link *perf_link;
^
skeleton/pid_iter.bpf.c:48:10: error: incomplete definition of type 'struct bpf_perf_link'
event = BPF_CORE_READ(perf_link, perf_file, private_data);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:404:2: note: expanded from macro 'BPF_CORE_READ'
BPF_CORE_READ_INTO(&__r, (src), a, ##__VA_ARGS__); \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:311:2: note: expanded from macro 'BPF_CORE_READ_INTO'
___core_read(bpf_core_read, bpf_core_read, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:302:2: note: expanded from macro '___core_read'
___apply(___core_read, ___empty(__VA_ARGS__))(fn, fn_ptr, dst, \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
note: (skipping 9 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:263:26: note: expanded from macro '___arrow2'
#define ___arrow2(a, b) a->b
^
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:277:44: note: expanded from macro '___read'
read_fn((void *)(dst), sizeof(*(dst)), &((src_type)(src))->accessor)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:206:79: note: expanded from macro 'bpf_core_read'
bpf_probe_read_kernel(dst, sz, (const void *)__builtin_preserve_access_index(src))
^~~
skeleton/pid_iter.bpf.c:44:9: note: forward declaration of 'struct bpf_perf_link'
struct bpf_perf_link *perf_link;
^
skeleton/pid_iter.bpf.c:48:8: warning: incompatible integer to pointer conversion assigning to 'struct perf_event *' from 'long' [-Wint-conversion]
event = BPF_CORE_READ(perf_link, perf_file, private_data);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skeleton/pid_iter.bpf.c:49:30: error: no member named 'bpf_cookie' in 'struct perf_event'
return BPF_CORE_READ(event, bpf_cookie);
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:403:17: note: expanded from macro 'BPF_CORE_READ'
___type((src), a, ##__VA_ARGS__) __r; \
~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:274:38: note: expanded from macro '___type'
#define ___type(...) typeof(___arrow(__VA_ARGS__))
~~~~~~~~~^~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:272:64: note: expanded from macro '___arrow'
#define ___arrow(...) ___apply(___arrow, ___narg(__VA_ARGS__))(__VA_ARGS__)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:263:28: note: expanded from macro '___arrow2'
#define ___arrow2(a, b) a->b
~ ^
skeleton/pid_iter.bpf.c:49:30: error: no member named 'bpf_cookie' in 'struct perf_event'
return BPF_CORE_READ(event, bpf_cookie);
~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:404:34: note: expanded from macro 'BPF_CORE_READ'
BPF_CORE_READ_INTO(&__r, (src), a, ##__VA_ARGS__); \
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:312:20: note: expanded from macro 'BPF_CORE_READ_INTO'
dst, (src), a, ##__VA_ARGS__) \
~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:303:18: note: expanded from macro '___core_read'
src, a, ##__VA_ARGS__)
~~~~~^~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:296:38: note: expanded from macro '___core_read0'
___read(fn, dst, ___type(src), src, a);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:277:61: note: expanded from macro '___read'
read_fn((void *)(dst), sizeof(*(dst)), &((src_type)(src))->accessor)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:206:79: note: expanded from macro 'bpf_core_read'
bpf_probe_read_kernel(dst, sz, (const void *)__builtin_preserve_access_index(src))
^~~
skeleton/pid_iter.bpf.c:49:9: error: returning 'void' from a function with incompatible result type '__u64' (aka 'unsigned long long')
return BPF_CORE_READ(event, bpf_cookie);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bootstrap/libbpf/include/bpf/bpf_core_read.h:402:36: note: expanded from macro 'BPF_CORE_READ'
#define BPF_CORE_READ(src, a, ...) ({ \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skeleton/pid_iter.bpf.c:90:36: error: use of undeclared identifier 'BPF_LINK_TYPE_PERF_EVENT'; did you mean 'BPF_PROG_TYPE_PERF_EVENT'?
if (BPF_CORE_READ(link, type) == BPF_LINK_TYPE_PERF_EVENT) {
^~~~~~~~~~~~~~~~~~~~~~~~
BPF_PROG_TYPE_PERF_EVENT
/home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/vmlinux.h:9615:2: note: 'BPF_PROG_TYPE_PERF_EVENT' declared here
BPF_PROG_TYPE_PERF_EVENT = 7,
^
1 warning and 8 errors generated.
make[2]: *** [Makefile:182: /home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/pid_iter.bpf.o] Error 1
make[1]: *** [samples/bpf/Makefile:296: /home/liusy/Downloads/linux-5.18/samples/bpf/bpftool/bpftool] Error 2
I searched for solutions for quite a long time. I found this https://www.spinics.net/lists/kernel/msg4322624.html . But I cannot get solution from it. Any help?
2 answers
solution1
3 2022-05-25 14:19:29
The error is in bpftool , because someone recently introduced a struct bpf_perf_link in the skeletons used by the tool to gather the PIDs of processes.
To compile without error, you need a kernel recent enough to have struct bpf_perf_link defined (it's 5.15+), and compiled with option CONFIG_PERF_EVENTS , as mentioned in the message you found.
Alternatively, there's a patch that was submitted upstream, but has not been merged yet as of this writing: it adds a local definition of the struct in the skeleton, which gets overwritten by the definition from the kernel BTF if present. You can find the patch here (it's a follow-up to the discussion you found) and apply it to bpftool. This should fix the error.
solution2
0 2022-07-07 04:18:02
This answer is in response to @Nicholas' question:
./include/linux/compiler.h:248:10: fatal error: 'asm/rwonce.h' file not found
(I need to have 50 reputation to comment below @Nicholas)
In my case I had the same problem when I tried to write a simple eBPF program. The solution is to modify Makefile:
linuxbuildhdrs ?= /lib/modules/`uname -r`/build
linuxhdrs ?= /lib/modules/`uname -r`/source
LINUXINCLUDE = -I$(linuxhdrs)/include \
-I$(linuxhdrs)/include/uapi \
-I$(linuxhdrs)/include/generated \
-I$(linuxhdrs)/include/generated/uapi \
-I$(linuxhdrs)/arch/x86/include \
-I$(linuxhdrs)/arch/x86/include/uapi \
-I$(linuxhdrs)/arch/x86/include/generated \
-I$(linuxhdrs)/arch/x86/include/generated/uapi\
-I$(linuxbuildhdrs)/include \
-I$(linuxbuildhdrs)/arch/x86/include/generated
And if your code must include linux/kconfig.h , remember to include it before including other header files.
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