This series aims to add support to bpf_snprintf_btf() and
bpf_seq_printf_btf() allowing them to store string representations
of module-specific types, as well as the kernel-specific ones
they currently support.
Patch 1 adds an additional field "const char *module" to
"struct btf_ptr", allowing the specification of a module
name along with a data pointer, BTF id, etc. It is then
used to look up module BTF, rather than the default
vmlinux BTF.
Patch 2 makes a small fix to libbpf to allow
btf__type_by_name[_kind] to work with split BTF. Without
this fix, type lookup of a module-specific type id will fail
in patch 3.
Patch 3 is a selftest that uses veth (when built as a
module) and a kprobe to display both a module-specific
and kernel-specific type; both are arguments to veth_stats_rx().
Alan Maguire (3):
bpf: add module support to btf display helpers
libbpf: bpf__find_by_name[_kind] should use btf__get_nr_types()
selftests/bpf: verify module-specific types can be shown via
bpf_snprintf_btf
include/linux/btf.h | 8 ++
include/uapi/linux/bpf.h | 5 +-
kernel/bpf/btf.c | 18 ++++
kernel/trace/bpf_trace.c | 42 +++++++---
tools/include/uapi/linux/bpf.h | 5 +-
tools/lib/bpf/btf.c | 4 +-
.../selftests/bpf/prog_tests/snprintf_btf_mod.c | 96 ++++++++++++++++++++++
tools/testing/selftests/bpf/progs/btf_ptr.h | 1 +
tools/testing/selftests/bpf/progs/veth_stats_rx.c | 73 ++++++++++++++++
9 files changed, 238 insertions(+), 14 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/snprintf_btf_mod.c
create mode 100644 tools/testing/selftests/bpf/progs/veth_stats_rx.c
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1.8.3.1
