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bpf: Introduce BPF_TRACE_x helper for the tracing tests

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For BPF_PROG_TYPE_TRACING, the bpf_prog's ctx is an array of u64.
This patch borrows the idea from BPF_CALL_x in filter.h to
convert a u64 to the arg type of the traced function.

The new BPF_TRACE_x has an arg to specify the return type of a bpf_prog.
It will be used in the future TCP-ops bpf_prog that may return "void".

The new macros are defined in the new header file "bpf_trace_helpers.h".
It is under selftests/bpf/ for now.  It could be moved to libbpf later
after seeing more upcoming non-tracing use cases.

The tests are changed to use these new macros also.  Hence,
the k[s]u8/16/32/64 are no longer needed and they are removed
from the bpf_helpers.h.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191123202504.1502696-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau
2019-11-23 12:25:04 -08:00
committed by Alexei Starovoitov
parent b8cd76ca4a
commit f9a7cf6eb1
7 changed files with 125 additions and 187 deletions
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13
tools/lib/bpf/bpf_helpers.h
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@@ -44,17 +44,4 @@ enum libbpf_pin_type {
LIBBPF_PIN_BY_NAME,
};
/* The following types should be used by BPF_PROG_TYPE_TRACING program to
* access kernel function arguments. BPF trampoline and raw tracepoints
* typecast arguments to 'unsigned long long'.
*/
typedef int __attribute__((aligned(8))) ks32;
typedef char __attribute__((aligned(8))) ks8;
typedef short __attribute__((aligned(8))) ks16;
typedef long long __attribute__((aligned(8))) ks64;
typedef unsigned int __attribute__((aligned(8))) ku32;
typedef unsigned char __attribute__((aligned(8))) ku8;
typedef unsigned short __attribute__((aligned(8))) ku16;
typedef unsigned long long __attribute__((aligned(8))) ku64;
#endif