linux.git/tools/testing/selftests/bpf/progs/bpf_dctcp.c, branch master

selftests/bpf: Move common TCP helpers into bpf_tracing_net.h

2025-11-18T22:57:45Z

Some BPF selftests contain identical copies of the min(), max(), before(), and after() helpers. These repeated snippets are the same across the tests and do not need to be defined separately. Move these helpers into bpf_tracing_net.h so they can be shared by TCP related BPF programs. This removes repeated code and keeps the helpers in a single place. Reviewed-by: Amery Hung Signed-off-by: Hoyeon Lee Signed-off-by: Martin KaFai Lau Link: https://patch.msgid.link/20251115225550.1086693-4-hoyeon.lee@suse.com

selftests/bpf: Fix typos and grammar in test sources

2025-08-27T22:13:08Z

Fix spelling typos and grammar errors in BPF selftests source code. Signed-off-by: Shubham Sharma Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20250826125746.17983-1-slopixelz@gmail.com

selftests/bpf: Rename fallback in bpf_dctcp to avoid naming conflict

2024-09-05T20:13:39Z

Recently, when compiling bpf selftests on RV64, the following compilation failure occurred: progs/bpf_dctcp.c:29:21: error: redefinition of 'fallback' as different kind of symbol 29 | volatile const char fallback[TCP_CA_NAME_MAX]; | ^ /workspace/tools/testing/selftests/bpf/tools/include/vmlinux.h:86812:15: note: previous definition is here 86812 | typedef u32 (*fallback)(u32, const unsigned char *, size_t); The reason is that the `fallback` symbol has been defined in arch/riscv/lib/crc32.c, which will cause symbol conflicts when vmlinux.h is included in bpf_dctcp. Let we rename `fallback` string to `fallback_cc` in bpf_dctcp to fix this compilation failure. Signed-off-by: Pu Lehui Link: https://lore.kernel.org/r/20240905081401.1894789-3-pulehui@huaweicloud.com Signed-off-by: Alexei Starovoitov

bpf: selftests: Namespace struct_opt callbacks in bpf_dctcp

2024-06-12T18:01:31Z

With generated kfunc prototypes, the existing callback names will conflict. Fix by namespacing with a bpf_ prefix. Signed-off-by: Daniel Xu Link: https://lore.kernel.org/r/efe7aadad8a054e5aeeba94b1d2e4502eee09d7a.1718207789.git.dxu@dxuuu.xyz Signed-off-by: Alexei Starovoitov

selftests/bpf: Use bpf_tracing_net.h in bpf_dctcp

2024-05-09T18:13:12Z

This patch uses bpf_tracing_net.h (i.e. vmlinux.h) in bpf_dctcp. This will allow to retire the bpf_tcp_helpers.h and consolidate tcp-cc tests to vmlinux.h. It will have a dup on min/max macros with the bpf_cubic. It could be further refactored in the future. Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20240509175026.3423614-8-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Rename tcp-cc private struct in bpf_cubic and bpf_dctcp

2024-05-09T18:13:12Z

The "struct bictcp" and "struct dctcp" are private to the bpf prog and they are stored in the private buffer in inet_csk(sk)->icsk_ca_priv. Hence, there is no bpf CO-RE required. The same struct name exists in the vmlinux.h. To reuse vmlinux.h, they need to be renamed such that the bpf prog logic will be immuned from the kernel tcp-cc changes. This patch adds a "bpf_" prefix to them. Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20240509175026.3423614-6-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Sanitize the SEC and inline usages in the bpf-tcp-cc tests

2024-05-09T18:13:11Z

It is needed to remove the BPF_STRUCT_OPS usages from the tcp-cc tests because it is defined in bpf_tcp_helpers.h which is going to be retired. While at it, this patch consolidates all tcp-cc struct_ops programs to use the SEC("struct_ops") + BPF_PROG(). It also removes the unnecessary __always_inline usages from the tcp-cc tests. Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20240509175026.3423614-5-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Check -EBUSY for the recurred bpf_setsockopt(TCP_CONGESTION)

2022-09-29T16:25:47Z

This patch changes the bpf_dctcp test to ensure the recurred bpf_setsockopt(TCP_CONGESTION) returns -EBUSY. Signed-off-by: Martin KaFai Lau Link: https://lore.kernel.org/r/20220929070407.965581-6-martin.lau@linux.dev Signed-off-by: Alexei Starovoitov

bpf: selftests: Add dctcp fallback test

2021-08-26T00:40:35Z

This patch makes the bpf_dctcp test to fallback to cubic by using setsockopt(TCP_CONGESTION) when the tcp flow is not ecn ready. It also checks setsockopt() is not available to release(). The settimeo() from the network_helpers.h is used, so the local one is removed. Signed-off-by: Martin KaFai Lau Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20210824173026.3979130-1-kafai@fb.com

bpf: selftests: Bpf_cubic and bpf_dctcp calling kernel functions

2021-03-27T03:41:52Z

This patch removes the bpf implementation of tcp_slow_start() and tcp_cong_avoid_ai(). Instead, it directly uses the kernel implementation. It also replaces the bpf_cubic_undo_cwnd implementation by directly calling tcp_reno_undo_cwnd(). bpf_dctcp also directly calls tcp_reno_cong_avoid() instead. Signed-off-by: Martin KaFai Lau Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20210325015246.1551062-1-kafai@fb.com