From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
David Miller <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>, <kernel-team@fb.com>,
<netdev@vger.kernel.org>
Subject: [PATCH v3 bpf-next 0/3] bpf: tcp: Add bpf_cubic example
Date: Wed, 22 Jan 2020 15:36:39 -0800 [thread overview]
Message-ID: <20200122233639.903041-1-kafai@fb.com> (raw)
This set adds bpf_cubic.c example. It was separated from the
earlier BPF STRUCT_OPS series. Some highlights since the
last post:
1. It is based on EricD recent fixes to the kernel tcp_cubic. [1]
2. The bpf jiffies reading helper is inlined by the verifier.
Different from the earlier version, it only reads jiffies alone
and does not do usecs/jiffies conversion.
3. The bpf .kconfig map is used to read CONFIG_HZ.
[1]: https://patchwork.ozlabs.org/cover/1215066/
v3:
- Remove __weak from CONFIG_HZ in patch 3. (Andrii)
v2:
- Move inlining to fixup_bpf_calls() in patch 1. (Daniel)
- It is inlined for 64 BITS_PER_LONG and jit_requested
as the map_gen_lookup(). Other cases could be
considered together with map_gen_lookup() if needed.
- Use usec resolution in bictcp_update() calculation in patch 3.
usecs_to_jiffies() is then removed(). (Eric)
Martin KaFai Lau (3):
bpf: Add BPF_FUNC_jiffies64
bpf: Sync uapi bpf.h to tools/
bpf: tcp: Add bpf_cubic example
include/linux/bpf.h | 1 +
include/uapi/linux/bpf.h | 9 +-
kernel/bpf/core.c | 1 +
kernel/bpf/helpers.c | 12 +
kernel/bpf/verifier.c | 24 +
net/core/filter.c | 2 +
tools/include/uapi/linux/bpf.h | 9 +-
tools/testing/selftests/bpf/bpf_tcp_helpers.h | 16 +
.../selftests/bpf/prog_tests/bpf_tcp_ca.c | 25 +
tools/testing/selftests/bpf/progs/bpf_cubic.c | 544 ++++++++++++++++++
10 files changed, 641 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/bpf_cubic.c
--
2.17.1
next reply other threads:[~2020-01-22 23:36 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 23:36 Martin KaFai Lau [this message]
2020-01-22 23:36 ` [PATCH v3 bpf-next 1/3] bpf: Add BPF_FUNC_jiffies64 Martin KaFai Lau
2020-01-22 23:36 ` [PATCH v3 bpf-next 2/3] bpf: Sync uapi bpf.h to tools/ Martin KaFai Lau
2020-01-22 23:36 ` [PATCH v3 bpf-next 3/3] bpf: tcp: Add bpf_cubic example Martin KaFai Lau
2020-01-23 0:40 ` [PATCH v3 bpf-next 0/3] " Alexei Starovoitov
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