Commit 9f7fa225 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add bpf_testmod kernel module for testing 



Add bpf_testmod module, which is conceptually out-of-tree module and provides
ways for selftests/bpf to test various kernel module-related functionality:
raw tracepoint, fentry/fexit/fmod_ret, etc. This module will be auto-loaded by
test_progs test runner and expected by some of selftests to be present and
loaded.

Pahole currently isn't able to generate BTF for static functions in kernel
modules, so make sure traced function is global.

Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-7-andrii@kernel.org
parent 4f33a53d

tools/testing/selftests/bpf/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -35,3 +35,4 @@ test_cpp 
/tools

/runqslower

/bench

*.ko

tools/testing/selftests/bpf/Makefile

+9 −3
Original line number Diff line number Diff line
@@ -80,7 +80,7 @@ TEST_PROGS_EXTENDED := with_addr.sh \ 
# Compile but not part of 'make run_tests'

TEST_GEN_PROGS_EXTENDED = test_sock_addr test_skb_cgroup_id_user \

	flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \

	test_lirc_mode2_user xdping test_cpp runqslower bench

	test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko



TEST_CUSTOM_PROGS = urandom_read
@@ -104,6 +104,7 @@ OVERRIDE_TARGETS := 1 
override define CLEAN

	$(call msg,CLEAN)

	$(Q)$(RM) -r $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) $(EXTRA_CLEAN)

	$(Q)$(MAKE) -C bpf_testmod clean

endef



include ../lib.mk
@@ -136,6 +137,11 @@ $(OUTPUT)/urandom_read: urandom_read.c 
	$(call msg,BINARY,,$@)

	$(Q)$(CC) $(LDFLAGS) -o $@ $< $(LDLIBS) -Wl,--build-id=sha1



$(OUTPUT)/bpf_testmod.ko: $(VMLINUX_BTF) $(wildcard bpf_testmod/Makefile bpf_testmod/*.[ch])

	$(call msg,MOD,,$@)

	$(Q)$(MAKE) $(submake_extras) -C bpf_testmod

	$(Q)cp bpf_testmod/bpf_testmod.ko $@



$(OUTPUT)/test_stub.o: test_stub.c $(BPFOBJ)

	$(call msg,CC,,$@)

	$(Q)$(CC) -c $(CFLAGS) -o $@ $<
@@ -388,7 +394,7 @@ TRUNNER_BPF_PROGS_DIR := progs 
TRUNNER_EXTRA_SOURCES := test_progs.c cgroup_helpers.c trace_helpers.c	\

			 network_helpers.c testing_helpers.c		\

			 btf_helpers.c	flow_dissector_load.h

TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read				\

TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko	\

		       ima_setup.sh					\

		       $(wildcard progs/btf_dump_test_case_*.c)

TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
@@ -460,4 +466,4 @@ $(OUTPUT)/bench: $(OUTPUT)/bench.o $(OUTPUT)/testing_helpers.o \ 
EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR)			\

	prog_tests/tests.h map_tests/tests.h verifier/tests.h		\

	feature								\

	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32 bpf_gcc)
 
	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32 bpf_gcc bpf_testmod.ko)

tools/testing/selftests/bpf/bpf_testmod/.gitignore

0 → 100644
+6 −0
Original line number Diff line number Diff line 
*.mod

*.mod.c

*.o

.ko

/Module.symvers

/modules.order

tools/testing/selftests/bpf/bpf_testmod/Makefile

0 → 100644
+20 −0
Original line number Diff line number Diff line 
BPF_TESTMOD_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))

KDIR ?= $(abspath $(BPF_TESTMOD_DIR)/../../../../..)



ifeq ($(V),1)

Q =

else

Q = @

endif



MODULES = bpf_testmod.ko



obj-m += bpf_testmod.o

CFLAGS_bpf_testmod.o = -I$(src)



all:

	+$(Q)make -C $(KDIR) M=$(BPF_TESTMOD_DIR) modules



clean:

	+$(Q)make -C $(KDIR) M=$(BPF_TESTMOD_DIR) clean

tools/testing/selftests/bpf/bpf_testmod/bpf_testmod-events.h

0 → 100644
+36 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright (c) 2020 Facebook */

#undef TRACE_SYSTEM

#define TRACE_SYSTEM bpf_testmod



#if !defined(_BPF_TESTMOD_EVENTS_H) || defined(TRACE_HEADER_MULTI_READ)

#define _BPF_TESTMOD_EVENTS_H



#include <linux/tracepoint.h>

#include "bpf_testmod.h"



TRACE_EVENT(bpf_testmod_test_read,

	TP_PROTO(struct task_struct *task, struct bpf_testmod_test_read_ctx *ctx),

	TP_ARGS(task, ctx),

	TP_STRUCT__entry(

		__field(pid_t, pid)

		__array(char, comm, TASK_COMM_LEN)

		__field(loff_t, off)

		__field(size_t, len)

	),

	TP_fast_assign(

		__entry->pid = task->pid;

		memcpy(__entry->comm, task->comm, TASK_COMM_LEN);

		__entry->off = ctx->off;

		__entry->len = ctx->len;

	),

	TP_printk("pid=%d comm=%s off=%llu len=%zu",

		  __entry->pid, __entry->comm, __entry->off, __entry->len)

);



#endif /* _BPF_TESTMOD_EVENTS_H */



#undef TRACE_INCLUDE_PATH

#define TRACE_INCLUDE_PATH .

#define TRACE_INCLUDE_FILE bpf_testmod-events

#include <trace/define_trace.h>

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