From: David Vernet <void@manifault.com> mainline inclusion from mainline-v6.7-rc1 commit 0d7ae06860753bb30b3731302b994da071120d00 category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8335 CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ---------------------------------------------------------------------- Now that we support pinning a BPF timer to the current core, we should test it with some selftests. This patch adds two new testcases to the timer suite, which verifies that a BPF timer both with and without BPF_F_TIMER_ABS, can be pinned to the calling core with BPF_F_TIMER_CPU_PIN. Signed-off-by: David Vernet <void@manifault.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <song@kernel.org> Acked-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/bpf/20231004162339.200702-3-void@manifault.com Signed-off-by: Luo Gengkun <luogengkun2@huawei.com> --- .../testing/selftests/bpf/prog_tests/timer.c | 4 ++ tools/testing/selftests/bpf/progs/timer.c | 63 ++++++++++++++++++- 2 files changed, 66 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/timer.c b/tools/testing/selftests/bpf/prog_tests/timer.c index ce2c61d62fc6..760ad96b4be0 100644 --- a/tools/testing/selftests/bpf/prog_tests/timer.c +++ b/tools/testing/selftests/bpf/prog_tests/timer.c @@ -15,6 +15,7 @@ static int timer(struct timer *timer_skel) ASSERT_EQ(timer_skel->data->callback_check, 52, "callback_check1"); ASSERT_EQ(timer_skel->data->callback2_check, 52, "callback2_check1"); + ASSERT_EQ(timer_skel->bss->pinned_callback_check, 0, "pinned_callback_check1"); prog_fd = bpf_program__fd(timer_skel->progs.test1); err = bpf_prog_test_run_opts(prog_fd, &topts); @@ -33,6 +34,9 @@ static int timer(struct timer *timer_skel) /* check that timer_cb3() was executed twice */ ASSERT_EQ(timer_skel->bss->abs_data, 12, "abs_data"); + /* check that timer_cb_pinned() was executed twice */ + ASSERT_EQ(timer_skel->bss->pinned_callback_check, 2, "pinned_callback_check"); + /* check that there were no errors in timer execution */ ASSERT_EQ(timer_skel->bss->err, 0, "err"); diff --git a/tools/testing/selftests/bpf/progs/timer.c b/tools/testing/selftests/bpf/progs/timer.c index 9a16d95213e1..8b946c8188c6 100644 --- a/tools/testing/selftests/bpf/progs/timer.c +++ b/tools/testing/selftests/bpf/progs/timer.c @@ -51,7 +51,7 @@ struct { __uint(max_entries, 1); __type(key, int); __type(value, struct elem); -} abs_timer SEC(".maps"); +} abs_timer SEC(".maps"), soft_timer_pinned SEC(".maps"), abs_timer_pinned SEC(".maps"); __u64 bss_data; __u64 abs_data; @@ -59,6 +59,8 @@ __u64 err; __u64 ok; __u64 callback_check = 52; __u64 callback2_check = 52; +__u64 pinned_callback_check; +__s32 pinned_cpu; #define ARRAY 1 #define HTAB 2 @@ -329,3 +331,62 @@ int BPF_PROG2(test3, int, a) return 0; } + +/* callback for pinned timer */ +static int timer_cb_pinned(void *map, int *key, struct bpf_timer *timer) +{ + __s32 cpu = bpf_get_smp_processor_id(); + + if (cpu != pinned_cpu) + err |= 16384; + + pinned_callback_check++; + return 0; +} + +static void test_pinned_timer(bool soft) +{ + int key = 0; + void *map; + struct bpf_timer *timer; + __u64 flags = BPF_F_TIMER_CPU_PIN; + __u64 start_time; + + if (soft) { + map = &soft_timer_pinned; + start_time = 0; + } else { + map = &abs_timer_pinned; + start_time = bpf_ktime_get_boot_ns(); + flags |= BPF_F_TIMER_ABS; + } + + timer = bpf_map_lookup_elem(map, &key); + if (timer) { + if (bpf_timer_init(timer, map, CLOCK_BOOTTIME) != 0) + err |= 4096; + bpf_timer_set_callback(timer, timer_cb_pinned); + pinned_cpu = bpf_get_smp_processor_id(); + bpf_timer_start(timer, start_time + 1000, flags); + } else { + err |= 8192; + } +} + +SEC("fentry/bpf_fentry_test4") +int BPF_PROG2(test4, int, a) +{ + bpf_printk("test4"); + test_pinned_timer(true); + + return 0; +} + +SEC("fentry/bpf_fentry_test5") +int BPF_PROG2(test5, int, a) +{ + bpf_printk("test5"); + test_pinned_timer(false); + + return 0; +} -- 2.34.1