kernel/tools/testing/selftests/bpf/prog_tests/ringbuf.c, branch linux-rolling-stable

selftests/bpf: Add overwrite mode test for BPF ring buffer

2025-10-28T02:46:32Z

Add overwrite mode test for BPF ring buffer. The test creates a BPF ring buffer in overwrite mode, then repeatedly reserves and commits records to check if the ring buffer works as expected both before and after overwriting occurs. Signed-off-by: Xu Kuohai Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20251018035738.4039621-3-xukuohai@huaweicloud.com

selftests/bpf: Fix ringbuf/ringbuf_write test failure with arm64 64KB page size

2025-06-07T02:21:43Z

The ringbuf max_entries must be PAGE_ALIGNED. See kernel function ringbuf_map_alloc(). So for arm64 64KB page size, adjust max_entries and other related metrics properly. Signed-off-by: Yonghong Song Link: https://lore.kernel.org/r/20250607013621.1552332-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Add more ring buffer test coverage

2024-06-24T11:43:55Z

Add test coverage for reservations beyond the ring buffer size in order to validate that bpf_ringbuf_reserve() rejects the request with NULL, all other ring buffer tests keep passing as well: # ./vmtest.sh -- ./test_progs -t ringbuf [...] ./test_progs -t ringbuf [ 1.165434] bpf_testmod: loading out-of-tree module taints kernel. [ 1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel [ 1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz [ 1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns [ 1.289555] clocksource: Switched to clocksource tsc #274/1 ringbuf/ringbuf:OK #274/2 ringbuf/ringbuf_n:OK #274/3 ringbuf/ringbuf_map_key:OK #274/4 ringbuf/ringbuf_write:OK #274 ringbuf:OK #275 ringbuf_multi:OK [...] Signed-off-by: Daniel Borkmann Signed-off-by: Andrii Nakryiko [ Test fixups for getting BPF CI back to work ] Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20240621140828.18238-2-daniel@iogearbox.net

selftests/bpf: Add ring_buffer__consume_n test.

2024-04-25T18:46:04Z

Add a testcase for the ring_buffer__consume_n() API. The test produces multiple samples in a ring buffer, using a sys_getpid() fentry prog, and consumes them from user-space in batches, rather than consuming all of them greedily, like ring_buffer__consume() does. Signed-off-by: Andrea Righi Signed-off-by: Andrii Nakryiko Acked-by: Jiri Olsa Link: https://lore.kernel.org/lkml/CAEf4BzaR4zqUpDmj44KNLdpJ=Tpa97GrvzuzVNO5nM6b7oWd1w@mail.gmail.com Link: https://lore.kernel.org/bpf/20240425140627.112728-1-andrea.righi@canonical.com

selftests/bpf: Add tests for ring__consume

2023-09-25T23:22:43Z

Add tests for new API ring__consume. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-15-martin.kelly@crowdstrike.com

selftests/bpf: Add tests for ring__map_fd

2023-09-25T23:22:43Z

Add tests for the new API ring__map_fd. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-13-martin.kelly@crowdstrike.com

selftests/bpf: Add tests for ring__size

2023-09-25T23:22:43Z

Add tests for the new API ring__size. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-11-martin.kelly@crowdstrike.com

selftests/bpf: Add tests for ring__avail_data_size

2023-09-25T23:22:43Z

Add test for the new API ring__avail_data_size. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-9-martin.kelly@crowdstrike.com

selftests/bpf: Add tests for ring__*_pos

2023-09-25T23:22:42Z

Add tests for the new APIs ring__producer_pos and ring__consumer_pos. Signed-off-by: Martin Kelly Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20230925215045.2375758-7-martin.kelly@crowdstrike.com

selftests/bpf: Add test verifying bpf_ringbuf_reserve retval use in map ops

2022-10-22T02:23:34Z

Add a test_ringbuf_map_key test prog, borrowing heavily from extant test_ringbuf.c. The program tries to use the result of bpf_ringbuf_reserve as map_key, which was not possible before previouis commits in this series. The test runner added to prog_tests/ringbuf.c verifies that the program loads and does basic sanity checks to confirm that it runs as expected. Also, refactor test_ringbuf such that runners for existing test_ringbuf and newly-added test_ringbuf_map_key are subtests of 'ringbuf' top-level test. Signed-off-by: Dave Marchevsky Acked-by: Yonghong Song Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20221020160721.4030492-3-davemarchevsky@fb.com Signed-off-by: Alexei Starovoitov