August 2023 - Linux-kselftest-mirror

[PATCH net v5 0/3] Avoid TCP resets when using ECMP for load-balancing between multiple servers.

by Sriram Yagnaraman

All packets in the same flow (L3/L4 depending on multipath hash policy) should be directed to the same target, but after [0]/[1] we see stray packets directed towards other targets. This, for instance, causes RST to be sent on TCP connections. The first two patches solve the problem by ignoring route hints for destinations that are part of multipath group, by using new SKB flags for IPv4 and IPv6. The third patch is a selftest that tests the scenario. Thanks to Ido, for reviewing and suggesting a way forward in [2] and also suggesting how to write a selftest for this. v4->v5: - Fixed review comments from Ido v3->v4: - Remove single path test - Rebase to latest v2->v3: - Add NULL check for skb in fib6_select_path (Ido Schimmel) - Use fib_tests.sh for selftest instead of the forwarding suite (Ido Schimmel) v1->v2: - Update to commit messages describing the solution (Ido Schimmel) - Use perf stat to count fib table lookups in selftest (Ido Schimmel) Sriram Yagnaraman (3): ipv4: ignore dst hint for multipath routes ipv6: ignore dst hint for multipath routes selftests: fib_tests: Add multipath list receive tests include/linux/ipv6.h | 1 + include/net/ip.h | 1 + net/ipv4/ip_input.c | 3 +- net/ipv4/route.c | 1 + net/ipv6/ip6_input.c | 3 +- net/ipv6/route.c | 3 + tools/testing/selftests/net/fib_tests.sh | 155 ++++++++++++++++++++++- 7 files changed, 164 insertions(+), 3 deletions(-) -- 2.34.1

8 months, 1 week

2
4
0 0

[PATCH] kunit: Reset test status on each param iteration

by Michal Wajdeczko

If we skip one parametrized test case then test status remains SKIP for all subsequent test params leading to wrong reports: $ ./tools/testing/kunit/kunit.py run \ --kunitconfig ./lib/kunit/.kunitconfig *.example_params* --raw_output \ [ ] Starting KUnit Kernel (1/1)... KTAP version 1 1..1 # example: initializing suite KTAP version 1 # Subtest: example # module: kunit_example_test 1..1 KTAP version 1 # Subtest: example_params_test # example_params_test: initializing # example_params_test: cleaning up ok 1 example value 3 # SKIP unsupported param value 3 # example_params_test: initializing # example_params_test: cleaning up ok 2 example value 2 # SKIP unsupported param value 3 # example_params_test: initializing # example_params_test: cleaning up ok 3 example value 1 # SKIP unsupported param value 3 # example_params_test: initializing # example_params_test: cleaning up ok 4 example value 0 # SKIP unsupported param value 0 # example_params_test: pass:0 fail:0 skip:4 total:4 ok 1 example_params_test # SKIP unsupported param value 0 # example: exiting suite ok 1 example # SKIP Reset test status and status comment after each param iteration to avoid using stale results. Signed-off-by: Michal Wajdeczko <michal.wajdeczko(a)intel.com> Cc: David Gow <davidgow(a)google.com> Cc: Rae Moar <rmoar(a)google.com> --- lib/kunit/kunit-example-test.c | 5 +++-- lib/kunit/test.c | 6 ++++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c index 01a769f35e1d..6bb5c2ef6696 100644 --- a/lib/kunit/kunit-example-test.c +++ b/lib/kunit/kunit-example-test.c @@ -190,6 +190,7 @@ static void example_static_stub_test(struct kunit *test) static const struct example_param { int value; } example_params_array[] = { + { .value = 3, }, { .value = 2, }, { .value = 1, }, { .value = 0, }, @@ -213,8 +214,8 @@ static void example_params_test(struct kunit *test) KUNIT_ASSERT_NOT_NULL(test, param); /* Test can be skipped on unsupported param values */ - if (!param->value) - kunit_skip(test, "unsupported param value"); + if (!is_power_of_2(param->value)) + kunit_skip(test, "unsupported param value %d", param->value); /* You can use param values for parameterized testing */ KUNIT_EXPECT_EQ(test, param->value % param->value, 0); diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 49698a168437..a53fd7e6d5bf 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -648,12 +648,14 @@ int kunit_run_tests(struct kunit_suite *suite) param_desc, test.status_comment); + kunit_update_stats(&param_stats, test.status); + /* Get next param. */ param_desc[0] = '\0'; test.param_value = test_case->generate_params(test.param_value, param_desc); test.param_index++; - - kunit_update_stats(&param_stats, test.status); + test.status = KUNIT_SUCCESS; + test.status_comment[0] = '\0'; } } -- 2.25.1

8 months, 1 week

2
1
0 0

[PATCH bpf v2] selftests/bpf: Include build flavors for install target

by Björn Töpel

From: Björn Töpel <bjorn(a)rivosinc.com> When using the "install" or targets depending on install, e.g. "gen_tar", the BPF machine flavors weren't included. A command like: | make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- O=/workspace/kbuild \ | HOSTCC=gcc FORMAT= SKIP_TARGETS="arm64 ia64 powerpc sparc64 x86 sgx" \ | -C tools/testing/selftests gen_tar would not include bpf/no_alu32, bpf/cpuv4, or bpf/bpf-gcc. Include the BPF machine flavors for "install" make target. Signed-off-by: Björn Töpel <bjorn(a)rivosinc.com> --- v1->v2: Rename the subdir variable, and define/populate it at more clear locations. (Daniel) --- tools/testing/selftests/bpf/Makefile | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index edef49fcd23e..caede9b574cb 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -50,14 +50,17 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test test_cgroup_storage \ test_tcpnotify_user test_sysctl \ test_progs-no_alu32 +TEST_INST_SUBDIRS := no_alu32 # Also test bpf-gcc, if present ifneq ($(BPF_GCC),) TEST_GEN_PROGS += test_progs-bpf_gcc +TEST_INST_SUBDIRS += bpf_gcc endif ifneq ($(CLANG_CPUV4),) TEST_GEN_PROGS += test_progs-cpuv4 +TEST_INST_SUBDIRS += cpuv4 endif TEST_GEN_FILES = test_lwt_ip_encap.bpf.o test_tc_edt.bpf.o @@ -714,3 +717,12 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) \ # Delete partially updated (corrupted) files on error .DELETE_ON_ERROR: + +DEFAULT_INSTALL_RULE := $(INSTALL_RULE) +override define INSTALL_RULE + $(DEFAULT_INSTALL_RULE) + @for DIR in $(TEST_INST_SUBDIRS); do \ + mkdir -p $(INSTALL_PATH)/$$DIR; \ + rsync -a $(OUTPUT)/$$DIR/*.bpf.o $(INSTALL_PATH)/$$DIR;\ + done +endef base-commit: d11ae1b16b0a57fac524cad8e277a20ec62600d1 -- 2.39.2

8 months, 1 week

3
2
0 0

[PATCH bpf-next] selftests/bpf: Include build flavors for install target

by Björn Töpel

From: Björn Töpel <bjorn(a)rivosinc.com> When using the "install" or targets depending on install, e.g. "gen_tar", the BPF machine flavors weren't included. A command like: | make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- O=/workspace/kbuild \ | HOSTCC=gcc FORMAT= SKIP_TARGETS="arm64 ia64 powerpc sparc64 x86 sgx" \ | -C tools/testing/selftests gen_tar would not include bpf/no_alu32, bpf/cpuv4, or bpf/bpf-gcc. Include the BPF machine flavors for "install" make target. Signed-off-by: Björn Töpel <bjorn(a)rivosinc.com> --- tools/testing/selftests/bpf/Makefile | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index edef49fcd23e..7c77a21c3371 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -598,12 +598,14 @@ $(eval $(call DEFINE_TEST_RUNNER,test_progs)) TRUNNER_BPF_BUILD_RULE := CLANG_NOALU32_BPF_BUILD_RULE TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(CLANG_CFLAGS) $(eval $(call DEFINE_TEST_RUNNER,test_progs,no_alu32)) +INSTDIRS := no_alu32 # Define test_progs-cpuv4 test runner. ifneq ($(CLANG_CPUV4),) TRUNNER_BPF_BUILD_RULE := CLANG_CPUV4_BPF_BUILD_RULE TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(CLANG_CFLAGS) $(eval $(call DEFINE_TEST_RUNNER,test_progs,cpuv4)) +INSTDIRS += cpuv4 endif # Define test_progs BPF-GCC-flavored test runner. @@ -611,6 +613,7 @@ ifneq ($(BPF_GCC),) TRUNNER_BPF_BUILD_RULE := GCC_BPF_BUILD_RULE TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(call get_sys_includes,gcc,) $(eval $(call DEFINE_TEST_RUNNER,test_progs,bpf_gcc)) +INSTDIRS += bpf_gcc endif # Define test_maps test runner. @@ -714,3 +717,12 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) \ # Delete partially updated (corrupted) files on error .DELETE_ON_ERROR: + +DEFAULT_INSTALL_RULE := $(INSTALL_RULE) +override define INSTALL_RULE + $(DEFAULT_INSTALL_RULE) + @for DIR in $(INSTDIRS); do \ + mkdir -p $(INSTALL_PATH)/$$DIR; \ + rsync -a $(OUTPUT)/$$DIR/*.bpf.o $(INSTALL_PATH)/$$DIR;\ + done +endef base-commit: 8be6f88b9d3fe1f6724daec4a70d6023742c9df7 -- 2.39.2

8 months, 1 week

2
2
0 0

[PATCH 0/6] Add printf attribute to kselftest functions

by Wieczor-Retman, Maciej

Kselftest.h declares many variadic functions that can print some formatted message while also executing selftest logic. These declarations don't have any compiler mechanism to verify if passed arguments are valid in comparison with format specifiers used in printf() calls. Attribute addition can make debugging easier, the code more consistent and prevent mismatched or missing variables. Add a __printf() macro that validates types of variables passed to the format string. The macro is similiarly used in other tools in the kernel. Add __printf() attributes to function definitions inside kselftest.h that use printing. Adding the __printf() macro exposes some mismatches in format strings across different selftests. Fix the mismatched format specifiers in multiple tests. Wieczor-Retman, Maciej (6): selftests: Add printf attribute to ksefltest prints selftests/cachestat: Fix print_cachestat format selftests/openat2: Fix wrong format specifier selftests/pidfd: Fix ksft print formats selftests/sigaltstack: Fix wrong format specifier selftests/kvm: Replace attribute with macro .../selftests/cachestat/test_cachestat.c | 2 +- tools/testing/selftests/kselftest.h | 18 ++++++++++-------- .../testing/selftests/kvm/include/test_util.h | 2 +- tools/testing/selftests/openat2/openat2_test.c | 2 +- .../selftests/pidfd/pidfd_fdinfo_test.c | 2 +- tools/testing/selftests/pidfd/pidfd_test.c | 12 ++++++------ tools/testing/selftests/sigaltstack/sas.c | 2 +- 7 files changed, 21 insertions(+), 19 deletions(-) base-commit: 13eb52f6293dbda02890698d92f3d9913d8d5aeb -- 2.42.0

8 months, 1 week

5
15
0 0

[PATCH bpf-next v9] selftests/bpf: trace_helpers.c: optimize kallsyms cache

by Rong Tao

From: Rong Tao <rongtao(a)cestc.cn> Static ksyms often have problems because the number of symbols exceeds the MAX_SYMS limit. Like changing the MAX_SYMS from 300000 to 400000 in commit e76a014334a6("selftests/bpf: Bump and validate MAX_SYMS") solves the problem somewhat, but it's not the perfect way. This commit uses dynamic memory allocation, which completely solves the problem caused by the limitation of the number of kallsyms. Acked-by: Stanislav Fomichev <sdf(a)google.com> Signed-off-by: Rong Tao <rongtao(a)cestc.cn> --- v9: Add load_kallsyms_local,ksym_search_local,ksym_get_addr_local functions. v8: https://lore.kernel.org/lkml/tencent_6D23FE187408D965E95DFAA858BC7E8C760A@q… Resolves inter-thread contention for ksyms global variables. v7: https://lore.kernel.org/lkml/tencent_BD6E19C00BF565CD5C36A9A0BD828CFA210A@q… Fix __must_check macro. v6: https://lore.kernel.org/lkml/tencent_4A09A36F883A06EA428A593497642AF8AF08@q… Apply libbpf_ensure_mem() v5: https://lore.kernel.org/lkml/tencent_0E9E1A1C0981678D5E7EA9E4BDBA8EE2200A@q… Release the allocated memory once the load_kallsyms_refresh() upon error given it's dynamically allocated. v4: https://lore.kernel.org/lkml/tencent_59C74613113F0C728524B2A82FE5540A5E09@q… Make sure most cases we don't need the realloc() path to begin with, and check strdup() return value. v3: https://lore.kernel.org/lkml/tencent_50B4B2622FE7546A5FF9464310650C008509@q… Do not use structs and judge ksyms__add_symbol function return value. v2: https://lore.kernel.org/lkml/tencent_B655EE5E5D463110D70CD2846AB3262EED09@q… Do the usual len/capacity scheme here to amortize the cost of realloc, and don't free symbols. v1: https://lore.kernel.org/lkml/tencent_AB461510B10CD484E0B2F62E3754165F2909@q… --- samples/bpf/Makefile | 4 + .../selftests/bpf/prog_tests/bpf_cookie.c | 9 +- .../selftests/bpf/prog_tests/fill_link_info.c | 9 +- .../bpf/prog_tests/get_stack_raw_tp.c | 10 +- .../bpf/prog_tests/kprobe_multi_test.c | 15 +- .../prog_tests/kprobe_multi_testmod_test.c | 19 ++- tools/testing/selftests/bpf/trace_helpers.c | 142 +++++++++++++----- tools/testing/selftests/bpf/trace_helpers.h | 8 + 8 files changed, 159 insertions(+), 57 deletions(-) diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile index 4ccf4236031c..6c707ebcebb9 100644 --- a/samples/bpf/Makefile +++ b/samples/bpf/Makefile @@ -175,6 +175,7 @@ TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/ TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE) TPROGS_CFLAGS += -I$(srctree)/tools/include TPROGS_CFLAGS += -I$(srctree)/tools/perf +TPROGS_CFLAGS += -I$(srctree)/tools/lib TPROGS_CFLAGS += -DHAVE_ATTR_TEST=0 ifdef SYSROOT @@ -314,6 +315,9 @@ XDP_SAMPLE_CFLAGS += -Wall -O2 \ $(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS) $(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h +# Override includes for trace_helpers.o because __must_check won't be defined +# in our include path. +$(obj)/$(TRACE_HELPERS): TPROGS_CFLAGS := $(TPROGS_CFLAGS) -D__must_check= -include $(BPF_SAMPLES_PATH)/Makefile.target diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c index 1454cebc262b..4ed47dc75669 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c @@ -104,8 +104,10 @@ static void kprobe_multi_link_api_subtest(void) LIBBPF_OPTS(bpf_link_create_opts, opts); unsigned long long addrs[8]; __u64 cookies[8]; + struct ksyms *ksyms; - if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + ksyms = load_kallsyms_local(); + if (!ASSERT_OK(ksyms != NULL, "load_kallsyms_local")) goto cleanup; skel = kprobe_multi__open_and_load(); @@ -116,8 +118,8 @@ static void kprobe_multi_link_api_subtest(void) skel->bss->test_cookie = true; #define GET_ADDR(__sym, __addr) ({ \ - __addr = ksym_get_addr(__sym); \ - if (!ASSERT_NEQ(__addr, 0, "ksym_get_addr " #__sym)) \ + __addr = ksym_get_addr_local(ksyms, __sym); \ + if (!ASSERT_NEQ(__addr, 0, "ksym_get_addr_local " #__sym)) \ goto cleanup; \ }) @@ -171,6 +173,7 @@ static void kprobe_multi_link_api_subtest(void) cleanup: close(link1_fd); close(link2_fd); + free_kallsyms_local(ksyms); kprobe_multi__destroy(skel); } diff --git a/tools/testing/selftests/bpf/prog_tests/fill_link_info.c b/tools/testing/selftests/bpf/prog_tests/fill_link_info.c index 9d768e083714..154aaa08761f 100644 --- a/tools/testing/selftests/bpf/prog_tests/fill_link_info.c +++ b/tools/testing/selftests/bpf/prog_tests/fill_link_info.c @@ -302,16 +302,18 @@ void test_fill_link_info(void) { struct test_fill_link_info *skel; int i; + struct ksyms *ksyms; skel = test_fill_link_info__open_and_load(); if (!ASSERT_OK_PTR(skel, "skel_open")) return; /* load kallsyms to compare the addr */ - if (!ASSERT_OK(load_kallsyms_refresh(), "load_kallsyms_refresh")) + ksyms = load_kallsyms_refresh_local(NULL); + if (!ASSERT_OK(ksyms != NULL, "load_kallsyms_refresh_local")) goto cleanup; - kprobe_addr = ksym_get_addr(KPROBE_FUNC); + kprobe_addr = ksym_get_addr_local(ksyms, KPROBE_FUNC); if (test__start_subtest("kprobe_link_info")) test_kprobe_fill_link_info(skel, BPF_PERF_EVENT_KPROBE, false); if (test__start_subtest("kretprobe_link_info")) @@ -329,7 +331,7 @@ void test_fill_link_info(void) qsort(kmulti_syms, KMULTI_CNT, sizeof(kmulti_syms[0]), symbols_cmp_r); for (i = 0; i < KMULTI_CNT; i++) - kmulti_addrs[i] = ksym_get_addr(kmulti_syms[i]); + kmulti_addrs[i] = ksym_get_addr_local(ksyms, kmulti_syms[i]); if (test__start_subtest("kprobe_multi_link_info")) test_kprobe_multi_fill_link_info(skel, false, false); if (test__start_subtest("kretprobe_multi_link_info")) @@ -339,4 +341,5 @@ void test_fill_link_info(void) cleanup: test_fill_link_info__destroy(skel); + free_kallsyms_local(ksyms); } diff --git a/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c b/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c index 858e0575f502..a317a6d04458 100644 --- a/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c +++ b/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c @@ -9,6 +9,7 @@ #define MAX_STACK_RAWTP 100 static int duration = 0; +static struct ksyms *ksyms; struct get_stack_trace_t { int pid; @@ -48,7 +49,7 @@ static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size) found = num_stack > 0; } else { for (i = 0; i < num_stack; i++) { - ks = ksym_search(raw_data[i]); + ks = ksym_search_local(ksyms, raw_data[i]); if (ks && (strcmp(ks->name, nonjit_func) == 0)) { found = true; break; @@ -65,7 +66,7 @@ static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size) good_kern_stack = num_stack > 0; } else { for (i = 0; i < num_stack; i++) { - ks = ksym_search(e.kern_stack[i]); + ks = ksym_search_local(ksyms, e.kern_stack[i]); if (ks && (strcmp(ks->name, nonjit_func) == 0)) { good_kern_stack = true; break; @@ -112,8 +113,8 @@ void test_get_stack_raw_tp(void) if (CHECK(!map, "bpf_find_map", "not found\n")) goto close_prog; - err = load_kallsyms(); - if (CHECK(err < 0, "load_kallsyms", "err %d errno %d\n", err, errno)) + ksyms = load_kallsyms_local(); + if (CHECK(!ksyms, "load_kallsyms_local", "err %d errno %d\n", err, errno)) goto close_prog; CPU_ZERO(&cpu_set); @@ -146,4 +147,5 @@ void test_get_stack_raw_tp(void) bpf_link__destroy(link); perf_buffer__free(pb); bpf_object__close(obj); + free_kallsyms_local(ksyms); } diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c index 179fe300534f..8683536ce217 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_test.c @@ -6,6 +6,8 @@ #include "bpf/libbpf_internal.h" #include "bpf/hashmap.h" +static struct ksyms *ksyms; + static void kprobe_multi_test_run(struct kprobe_multi *skel, bool test_return) { LIBBPF_OPTS(bpf_test_run_opts, topts); @@ -89,7 +91,7 @@ static void test_link_api(struct bpf_link_create_opts *opts) } #define GET_ADDR(__sym, __addr) ({ \ - __addr = ksym_get_addr(__sym); \ + __addr = ksym_get_addr_local(ksyms, __sym); \ if (!ASSERT_NEQ(__addr, 0, "kallsyms load failed for " #__sym)) \ return; \ }) @@ -222,10 +224,10 @@ static void test_attach_api_fails(void) }; __u64 cookies[2]; - addrs[0] = ksym_get_addr("bpf_fentry_test1"); - addrs[1] = ksym_get_addr("bpf_fentry_test2"); + addrs[0] = ksym_get_addr_local(ksyms, "bpf_fentry_test1"); + addrs[1] = ksym_get_addr_local(ksyms, "bpf_fentry_test2"); - if (!ASSERT_FALSE(!addrs[0] || !addrs[1], "ksym_get_addr")) + if (!ASSERT_FALSE(!addrs[0] || !addrs[1], "ksym_get_addr_local")) goto cleanup; skel = kprobe_multi__open_and_load(); @@ -463,7 +465,8 @@ void serial_test_kprobe_multi_bench_attach(void) void test_kprobe_multi_test(void) { - if (!ASSERT_OK(load_kallsyms(), "load_kallsyms")) + ksyms = load_kallsyms_local(); + if (!ASSERT_OK(ksyms != NULL, "load_kallsyms_local")) return; if (test__start_subtest("skel_api")) @@ -480,4 +483,6 @@ void test_kprobe_multi_test(void) test_attach_api_syms(); if (test__start_subtest("attach_api_fails")) test_attach_api_fails(); + + free_kallsyms_local(ksyms); } diff --git a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c index 1fbe7e4ac00a..ee3e28d76a78 100644 --- a/tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c +++ b/tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c @@ -4,6 +4,8 @@ #include "trace_helpers.h" #include "bpf/libbpf_internal.h" +static struct ksyms *ksyms; + static void kprobe_multi_testmod_check(struct kprobe_multi *skel) { ASSERT_EQ(skel->bss->kprobe_testmod_test1_result, 1, "kprobe_test1_result"); @@ -50,12 +52,12 @@ static void test_testmod_attach_api_addrs(void) LIBBPF_OPTS(bpf_kprobe_multi_opts, opts); unsigned long long addrs[3]; - addrs[0] = ksym_get_addr("bpf_testmod_fentry_test1"); - ASSERT_NEQ(addrs[0], 0, "ksym_get_addr"); - addrs[1] = ksym_get_addr("bpf_testmod_fentry_test2"); - ASSERT_NEQ(addrs[1], 0, "ksym_get_addr"); - addrs[2] = ksym_get_addr("bpf_testmod_fentry_test3"); - ASSERT_NEQ(addrs[2], 0, "ksym_get_addr"); + addrs[0] = ksym_get_addr_local(ksyms, "bpf_testmod_fentry_test1"); + ASSERT_NEQ(addrs[0], 0, "ksym_get_addr_local"); + addrs[1] = ksym_get_addr_local(ksyms, "bpf_testmod_fentry_test2"); + ASSERT_NEQ(addrs[1], 0, "ksym_get_addr_local"); + addrs[2] = ksym_get_addr_local(ksyms, "bpf_testmod_fentry_test3"); + ASSERT_NEQ(addrs[2], 0, "ksym_get_addr_local"); opts.addrs = (const unsigned long *) addrs; opts.cnt = ARRAY_SIZE(addrs); @@ -79,11 +81,14 @@ static void test_testmod_attach_api_syms(void) void serial_test_kprobe_multi_testmod_test(void) { - if (!ASSERT_OK(load_kallsyms_refresh(), "load_kallsyms_refresh")) + ksyms = load_kallsyms_refresh_local(ksyms); + if (!ASSERT_OK(ksyms != NULL, "load_kallsyms_refresh_local")) return; if (test__start_subtest("testmod_attach_api_syms")) test_testmod_attach_api_syms(); if (test__start_subtest("testmod_attach_api_addrs")) test_testmod_attach_api_addrs(); + + free_kallsyms_local(ksyms); } diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index f83d9f65c65b..398c4fa5d1dc 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -14,104 +14,176 @@ #include <linux/limits.h> #include <libelf.h> #include <gelf.h> +#include "bpf/libbpf_internal.h" #define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe" #define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe" -#define MAX_SYMS 400000 -static struct ksym syms[MAX_SYMS]; -static int sym_cnt; +struct ksyms { + struct ksym *syms; + size_t sym_cap; + size_t sym_cnt; +}; + +static struct ksyms *ksyms; + +static int ksyms__add_symbol(struct ksyms *ksyms, const char *name, + unsigned long addr) +{ + void *tmp; + + tmp = strdup(name); + if (!tmp) + return -ENOMEM; + ksyms->syms[ksyms->sym_cnt].addr = addr; + ksyms->syms[ksyms->sym_cnt].name = tmp; + + ksyms->sym_cnt++; + + return 0; +} + +void free_kallsyms_local(struct ksyms *ksyms) +{ + unsigned int i; + + if (!ksyms) + return; + + if (!ksyms->syms) { + free(ksyms); + return; + } + + for (i = 0; i < ksyms->sym_cnt; i++) + free(ksyms->syms[i].name); + free(ksyms->syms); + free(ksyms); +} static int ksym_cmp(const void *p1, const void *p2) { return ((struct ksym *)p1)->addr - ((struct ksym *)p2)->addr; } -int load_kallsyms_refresh(void) +struct ksyms *load_kallsyms_refresh_local(struct ksyms *ksyms) { FILE *f; char func[256], buf[256]; char symbol; void *addr; - int i = 0; + int ret; - sym_cnt = 0; + /* flush kallsyms, free the previously allocated dynamic memory */ + free_kallsyms_local(ksyms); f = fopen("/proc/kallsyms", "r"); if (!f) - return -ENOENT; + return NULL; + + ksyms = calloc(1, sizeof(struct ksyms)); + if (!ksyms) + return NULL; while (fgets(buf, sizeof(buf), f)) { if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3) break; if (!addr) continue; - if (i >= MAX_SYMS) - return -EFBIG; - syms[i].addr = (long) addr; - syms[i].name = strdup(func); - i++; + ret = libbpf_ensure_mem((void **) &ksyms->syms, &ksyms->sym_cap, + sizeof(struct ksym), ksyms->sym_cnt + 1); + if (ret) + goto error; + ret = ksyms__add_symbol(ksyms, func, (unsigned long)addr); + if (ret) + goto error; } fclose(f); - sym_cnt = i; - qsort(syms, sym_cnt, sizeof(struct ksym), ksym_cmp); - return 0; + qsort(ksyms->syms, ksyms->sym_cnt, sizeof(struct ksym), ksym_cmp); + return ksyms; + +error: + free_kallsyms_local(ksyms); + return NULL; +} + +int load_kallsyms_refresh(void) +{ + ksyms = load_kallsyms_refresh_local(NULL); + return ksyms ? 0 : 1; +} + +struct ksyms *load_kallsyms_local(void) +{ + return load_kallsyms_refresh_local(NULL); } int load_kallsyms(void) { - /* - * This is called/used from multiplace places, - * load symbols just once. - */ - if (sym_cnt) - return 0; - return load_kallsyms_refresh(); + ksyms = load_kallsyms_local(); + return ksyms ? 0 : 1; } -struct ksym *ksym_search(long key) +struct ksym *ksym_search_local(struct ksyms *ksyms, long key) { - int start = 0, end = sym_cnt; + int start = 0, end = ksyms->sym_cnt; int result; + if (!ksyms) + return NULL; + /* kallsyms not loaded. return NULL */ - if (sym_cnt <= 0) + if (ksyms->sym_cnt <= 0) return NULL; while (start < end) { size_t mid = start + (end - start) / 2; - result = key - syms[mid].addr; + result = key - ksyms->syms[mid].addr; if (result < 0) end = mid; else if (result > 0) start = mid + 1; else - return &syms[mid]; + return &ksyms->syms[mid]; } - if (start >= 1 && syms[start - 1].addr < key && - key < syms[start].addr) + if (start >= 1 && ksyms->syms[start - 1].addr < key && + key < ksyms->syms[start].addr) /* valid ksym */ - return &syms[start - 1]; + return &ksyms->syms[start - 1]; /* out of range. return _stext */ - return &syms[0]; + return &ksyms->syms[0]; } -long ksym_get_addr(const char *name) +struct ksym *ksym_search(long key) +{ + if (!ksyms) + return NULL; + return ksym_search_local(ksyms, key); +} + +long ksym_get_addr_local(struct ksyms *ksyms, const char *name) { int i; - for (i = 0; i < sym_cnt; i++) { - if (strcmp(syms[i].name, name) == 0) - return syms[i].addr; + for (i = 0; i < ksyms->sym_cnt; i++) { + if (strcmp(ksyms->syms[i].name, name) == 0) + return ksyms->syms[i].addr; } return 0; } +long ksym_get_addr(const char *name) +{ + if (!ksyms) + return 0; + return ksym_get_addr_local(ksyms, name); +} + /* open kallsyms and read symbol addresses on the fly. Without caching all symbols, * this is faster than load + find. */ diff --git a/tools/testing/selftests/bpf/trace_helpers.h b/tools/testing/selftests/bpf/trace_helpers.h index 876f3e711df6..4441a239316d 100644 --- a/tools/testing/selftests/bpf/trace_helpers.h +++ b/tools/testing/selftests/bpf/trace_helpers.h @@ -11,6 +11,7 @@ struct ksym { long addr; char *name; }; +struct ksyms; int load_kallsyms(void); int load_kallsyms_refresh(void); @@ -18,6 +19,13 @@ int load_kallsyms_refresh(void); struct ksym *ksym_search(long key); long ksym_get_addr(const char *name); +struct ksyms *load_kallsyms_local(void); +struct ksyms *load_kallsyms_refresh_local(struct ksyms *ksyms); +void free_kallsyms_local(struct ksyms *ksyms); + +struct ksym *ksym_search_local(struct ksyms *ksyms, long key); +long ksym_get_addr_local(struct ksyms *ksyms, const char *name); + /* open kallsyms and find addresses on the fly, faster than load + search. */ int kallsyms_find(const char *sym, unsigned long long *addr); -- 2.41.0

8 months, 1 week

2
1
0 0

[PATCH] selftests/mm: gup_longterm: fix a resource leak

by Ding Xiang

The opened file should be closed in run_with_tmpfile(), otherwise resource leak will occur Signed-off-by: Ding Xiang <dingxiang(a)cmss.chinamobile.com> --- tools/testing/selftests/mm/gup_longterm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c index d33d3e68ffab..ad168d35b23b 100644 --- a/tools/testing/selftests/mm/gup_longterm.c +++ b/tools/testing/selftests/mm/gup_longterm.c @@ -265,10 +265,11 @@ static void run_with_tmpfile(test_fn fn, const char *desc) fd = fileno(file); if (fd < 0) { ksft_test_result_fail("fileno() failed\n"); - return; + goto close; } fn(fd, pagesize); +close: fclose(file); } -- 2.38.1

8 months, 1 week

1
0
0 0

Re: [PATCH V4 3/7] cpufreq: amd-pstate: Enable AMD Pstate Preferred Core Supporting.

by Rene Rebe

Dear Meng Li and team, thank you so much for working on finally bringing AMD preferred core scheduling to mainline Linux! > The initial core rankings are set up by AMD Pstate when the > system boots. I tested this patch on our Ryzen 7950x and 5950x systems and could unfortunatlely not find any performance differences. I therefore took a closer look and as far as I can tell the conditional for the initial preferred performance priorities appears to be reversed. I marked them down below. I also attached a patch for the fix. With that fixed I can measure a 0.7% improvement compiling Firefox on 7950x. I wonder slightly how this ever past testing before, ... I think it would be a good idea to always expose the hw perf values in sysfs to help users debugging hardware issues or BIOS settings even with percore not enabled and therefore not using the unused 166 or 255 values anyway. With that fixed, however, Linux is still not always scheduling to preferred cores, but that appears to be an independant limitation of the current linux scheduler not strictly using the priority for scheduling, yet. With manual taskset guidance I could further improve the Firefox build time by some more seconds to over 1% overall performance improvement, if the linux scheudler would more reliably schedule minute long running rust lto link tasks to the preferred cores and not some mediocre ones. > - highest_perf = amd_get_highest_perf(); > - if (highest_perf > AMD_CPPC_HIGHEST_PERF(cap1)) > - highest_perf = AMD_CPPC_HIGHEST_PERF(cap1); > - > - WRITE_ONCE(cpudata->highest_perf, highest_perf); > + if (prefcore) > + WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); > + else > + WRITE_ONCE(cpudata->highest_perf, AMD_CPPC_HIGHEST_PERF(cap1)); Conditional reversed, assigns THRESHOLD if enabled! > WRITE_ONCE(cpudata->nominal_perf, AMD_CPPC_NOMINAL_PERF(cap1)); > WRITE_ONCE(cpudata->lowest_nonlinear_perf, AMD_CPPC_LOWNONLIN_PERF(cap1)); > @@ -318,17 +322,15 @@ static int pstate_init_perf(struct amd_cpudata *cpudata) > static int cppc_init_perf(struct amd_cpudata *cpudata) > { > struct cppc_perf_caps cppc_perf; > - u32 highest_perf; > > int ret = cppc_get_perf_caps(cpudata->cpu, &cppc_perf); > if (ret) > return ret; > > - highest_perf = amd_get_highest_perf(); > - if (highest_perf > cppc_perf.highest_perf) > - highest_perf = cppc_perf.highest_perf; > - > - WRITE_ONCE(cpudata->highest_perf, highest_perf); > + if (prefcore) > + WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); > + else > + WRITE_ONCE(cpudata->highest_perf, cppc_perf.highest_perf); Same here. Not using highest_perf if enabled, ... Signed-off-by: René Rebe <rene(a)exactcode.de> --- linux-6.4/drivers/cpufreq/amd-pstate.c.vanilla 2023-08-25 22:34:25.254995690 +0200 +++ linux-6.4/drivers/cpufreq/amd-pstate.c 2023-08-25 22:35:49.194991446 +0200 @@ -282,9 +282,9 @@ * the default max perf. */ if (prefcore) - WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); - else WRITE_ONCE(cpudata->highest_perf, AMD_CPPC_HIGHEST_PERF(cap1)); + else + WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); WRITE_ONCE(cpudata->nominal_perf, AMD_CPPC_NOMINAL_PERF(cap1)); WRITE_ONCE(cpudata->lowest_nonlinear_perf, AMD_CPPC_LOWNONLIN_PERF(cap1)); @@ -303,9 +303,9 @@ return ret; if (prefcore) - WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); - else WRITE_ONCE(cpudata->highest_perf, cppc_perf.highest_perf); + else + WRITE_ONCE(cpudata->highest_perf, AMD_PSTATE_PREFCORE_THRESHOLD); WRITE_ONCE(cpudata->nominal_perf, cppc_perf.nominal_perf); WRITE_ONCE(cpudata->lowest_nonlinear_perf, -- René Rebe, ExactCODE GmbH, Lietzenburger Str. 42, DE-10789 Berlin https://exactcode.com | https://t2sde.org | https://rene.rebe.de

8 months, 1 week

2
1
0 0

[PATCH v2 0/2] selftests/resctrl: Bug fix and optimizations

by Wieczor-Retman, Maciej

Write_schemata() uses fprintf() to write a bitmask into a schemata file inside resctrl FS. It checks fprintf() return value but it doesn't check fclose() return value. Error codes from fprintf() such as write errors, are flushed back to the user only after fclose() is executed which means any invalid bitmask can be written into the schemata file. Rewrite write_schemata() to use syscalls instead of stdio functions to interact with the schemata file. Change sprintf() to snprintf() in write_schemata(). In case of write() returning an error pass the string acquired with strerror() to the "reason" buffer. Extend "reason" buffer by a factor of two so it can hold longer error messages. The resctrlfs.c file defines functions that interact with the resctrl FS while resctrl_val.c file defines functions that perform measurements on the cache. Run_benchmark() fits logically into the second file before resctrl_val() function that uses it. Move run_benchmark() from resctrlfs.c to resctrl_val.c just before resctrl_val() function definition. Series is based on kselftest next branch. Changelog v2: - Change sprintf() to snprintf() in write_schemata(). - Redo write_schemata() with syscalls instead of stdio functions. - Fix typos and missing dots in patch messages. - Branch printf attribute patch to a separate series. [v1] https://lore.kernel.org/all/cover.1692880423.git.maciej.wieczor-retman@inte… Wieczor-Retman, Maciej (2): selftests/resctrl: Fix schemata write error check selftests/resctrl: Move run_benchmark() to a more fitting file tools/testing/selftests/resctrl/resctrl_val.c | 50 ++++++++++++ tools/testing/selftests/resctrl/resctrlfs.c | 76 ++++--------------- 2 files changed, 63 insertions(+), 63 deletions(-) base-commit: 13eb52f6293dbda02890698d92f3d9913d8d5aeb -- 2.42.0

8 months, 1 week

4
9
0 0

[PATCH v3 0/7] selftests/resctrl: Rework benchmark command handling

by Ilpo Järvinen

The benchmark command handling (-b) in resctrl selftests is overly complicated code. This series turns the benchmark command immutable to preserve it for all selftests and improves benchmark command related error handling. This series also ends up removing the strcpy() calls which were pointed out earlier. v3: - Removed DEFAULT_SPAN_STR for real and the duplicated copy of defines that made to v2 likely due to my incorrect conflict resolutions v2: - Added argument length check into patch 1/7 - Updated also -b line in help message. - Document -b argument related "algorithm" - Use asprintf() to convert defined constant int to string - Improved changelog texts - Added \n to ksft_exit_fail_msg() call messages. - Print DEFAULT_SPAN with %u instead of %zu to avoid need to cast it Ilpo Järvinen (7): selftests/resctrl: Ensure the benchmark commands fits to its array selftests/resctrl: Correct benchmark command help selftests/resctrl: Remove bw_report and bm_type from main() selftests/resctrl: Simplify span lifetime selftests/resctrl: Make benchmark command const and build it with pointers selftests/resctrl: Remove ben_count variable selftests/resctrl: Cleanup benchmark argument parsing tools/testing/selftests/resctrl/cache.c | 5 +- tools/testing/selftests/resctrl/cat_test.c | 13 +- tools/testing/selftests/resctrl/cmt_test.c | 34 +++-- tools/testing/selftests/resctrl/mba_test.c | 4 +- tools/testing/selftests/resctrl/mbm_test.c | 7 +- tools/testing/selftests/resctrl/resctrl.h | 17 ++- .../testing/selftests/resctrl/resctrl_tests.c | 120 +++++++++--------- tools/testing/selftests/resctrl/resctrl_val.c | 10 +- 8 files changed, 120 insertions(+), 90 deletions(-) -- 2.30.2

8 months, 1 week

4
16
0 0

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Linux-kselftest-mirror August 2023