From 954fa97e215ea8fb1fe70d117d25875f3d3938ea Mon Sep 17 00:00:00 2001 From: Emil Tsalapatis Date: Tue, 3 Feb 2026 13:04:22 -0500 Subject: selftests/bpf: Add selftests for bpf_stream_print_stack Add selftests for the new bpf_stream_print_stack kfunc. Signed-off-by: Emil Tsalapatis Acked-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260203180424.14057-3-emil@etsalapatis.com Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/progs/stream.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'tools/testing') diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c index 4a5bd852f10c..f63b378de090 100644 --- a/tools/testing/selftests/bpf/progs/stream.c +++ b/tools/testing/selftests/bpf/progs/stream.c @@ -234,4 +234,25 @@ int stream_arena_callback_fault(void *ctx) return 0; } +SEC("syscall") +__arch_x86_64 +__arch_arm64 +__success __retval(0) +__stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}") +__stderr("Call trace:\n" +"{{([a-zA-Z_][a-zA-Z0-9_]*\\+0x[0-9a-fA-F]+/0x[0-9a-fA-F]+\n" +"|[ \t]+[^\n]+\n)*}}") +int stream_print_stack_kfunc(void *ctx) +{ + return bpf_stream_print_stack(BPF_STDERR); +} + +SEC("syscall") +__success __retval(-2) +int stream_print_stack_invalid_id(void *ctx) +{ + /* Try to pass an invalid stream ID. */ + return bpf_stream_print_stack((enum bpf_stream_id)0xbadcafe); +} + char _license[] SEC("license") = "GPL"; -- cgit v1.2.3 From 4d99137eea48b18387d8d17443e28d124177ab7b Mon Sep 17 00:00:00 2001 From: Emil Tsalapatis Date: Tue, 3 Feb 2026 13:04:24 -0500 Subject: selftests/bpf: Add selftests for stream functions under lock Add a selftest to ensure BPF stream functions can now be called while holding a lock. Signed-off-by: Emil Tsalapatis Acked-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260203180424.14057-5-emil@etsalapatis.com Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/progs/stream.c | 32 ++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'tools/testing') diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c index f63b378de090..6f999ba951a3 100644 --- a/tools/testing/selftests/bpf/progs/stream.c +++ b/tools/testing/selftests/bpf/progs/stream.c @@ -42,6 +42,10 @@ int size; u64 fault_addr; void *arena_ptr; +#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8))) + +private(STREAM) struct bpf_spin_lock block; + SEC("syscall") __success __retval(0) int stream_exhaust(void *ctx) @@ -255,4 +259,32 @@ int stream_print_stack_invalid_id(void *ctx) return bpf_stream_print_stack((enum bpf_stream_id)0xbadcafe); } +SEC("syscall") +__arch_x86_64 +__arch_arm64 +__success __retval(0) +__stdout(_STR) +__stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}") +__stderr("Call trace:\n" +"{{([a-zA-Z_][a-zA-Z0-9_]*\\+0x[0-9a-fA-F]+/0x[0-9a-fA-F]+\n" +"|[ \t]+[^\n]+\n)*}}") +int stream_print_kfuncs_locked(void *ctx) +{ + int ret; + + bpf_spin_lock(&block); + + ret = bpf_stream_printk(BPF_STDOUT, _STR); + if (ret) + goto out; + + ret = bpf_stream_print_stack(BPF_STDERR); + +out: + bpf_spin_unlock(&block); + + return ret; +} + + char _license[] SEC("license") = "GPL"; -- cgit v1.2.3