From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: bpf <bpf@vger.kernel.org>, "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next v6 5/9] bpf: Enable TCP congestion control kfunc from modules
Date: Fri, 1 Oct 2021 14:14:54 -0700 [thread overview]
Message-ID: <CAEf4BzY-mLZS6VgoA=AOHji9ULp1a03LgAXThhLEpqMLv3HLCg@mail.gmail.com> (raw)
In-Reply-To: <20210930062948.1843919-6-memxor@gmail.com>
On Wed, Sep 29, 2021 at 11:30 PM Kumar Kartikeya Dwivedi
<memxor@gmail.com> wrote:
>
> This commit moves BTF ID lookup into the newly added registration
> helper, in a way that the bbr, cubic, and dctcp implementation set up
> their sets in the bpf_tcp_ca kfunc_btf_set list, while the ones not
> dependent on modules are looked up from the wrapper function.
>
> This lifts the restriction for them to be compiled as built in objects,
> and can be loaded as modules if required. Also modify Makefile.modfinal
> to call resolve_btfids for each module.
>
> Note that since kernel kfunc_ids never overlap with module kfunc_ids, we
> only match the owner for module btf id sets.
>
> See following commits for background on use of:
>
> CONFIG_X86 ifdef:
> 569c484f9995 (bpf: Limit static tcp-cc functions in the .BTF_ids list to x86)
>
> CONFIG_DYNAMIC_FTRACE ifdef:
> 7aae231ac93b (bpf: tcp: Limit calling some tcp cc functions to CONFIG_DYNAMIC_FTRACE)
>
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
> ---
> include/linux/btf.h | 4 ++++
> kernel/bpf/btf.c | 3 +++
> net/ipv4/bpf_tcp_ca.c | 34 +++-------------------------------
> net/ipv4/tcp_bbr.c | 28 +++++++++++++++++++++++++++-
> net/ipv4/tcp_cubic.c | 26 +++++++++++++++++++++++++-
> net/ipv4/tcp_dctcp.c | 26 +++++++++++++++++++++++++-
> scripts/Makefile.modfinal | 1 +
> 7 files changed, 88 insertions(+), 34 deletions(-)
>
[...]
> BTF_SET_END(bpf_tcp_ca_kfunc_ids)
>
> static bool bpf_tcp_ca_check_kfunc_call(u32 kfunc_btf_id, struct module *owner)
> {
> - return btf_id_set_contains(&bpf_tcp_ca_kfunc_ids, kfunc_btf_id);
> + if (btf_id_set_contains(&bpf_tcp_ca_kfunc_ids, kfunc_btf_id))
> + return true;
> + return __bpf_tcp_ca_check_kfunc_call(kfunc_btf_id, owner);
so here, why it can't be generic
__bpf_check_kfunc_call(&bpf_tcp_ca_kfunc_list, kfunc_btf_id, owner);
?
> }
>
> static const struct bpf_verifier_ops bpf_tcp_ca_verifier_ops = {
[...]
next prev parent reply other threads:[~2021-10-01 21:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 6:29 [PATCH bpf-next v6 0/9] Support kernel module function calls from eBPF Kumar Kartikeya Dwivedi
2021-09-30 6:29 ` [PATCH bpf-next v6 1/9] bpf: Introduce BPF support for kernel module function calls Kumar Kartikeya Dwivedi
2021-09-30 6:29 ` [PATCH bpf-next v6 2/9] bpf: Be conservative while processing invalid kfunc calls Kumar Kartikeya Dwivedi
2021-09-30 6:29 ` [PATCH bpf-next v6 3/9] bpf: btf: Introduce helpers for dynamic BTF set registration Kumar Kartikeya Dwivedi
2021-10-01 21:09 ` Andrii Nakryiko
2021-09-30 6:29 ` [PATCH bpf-next v6 4/9] tools: Allow specifying base BTF file in resolve_btfids Kumar Kartikeya Dwivedi
2021-10-01 21:11 ` Andrii Nakryiko
2021-09-30 6:29 ` [PATCH bpf-next v6 5/9] bpf: Enable TCP congestion control kfunc from modules Kumar Kartikeya Dwivedi
2021-10-01 21:14 ` Andrii Nakryiko [this message]
2021-09-30 6:29 ` [PATCH bpf-next v6 6/9] libbpf: Support kernel module function calls Kumar Kartikeya Dwivedi
2021-10-01 21:56 ` Andrii Nakryiko
2021-09-30 6:29 ` [PATCH bpf-next v6 7/9] libbpf: Resolve invalid weak kfunc calls with imm = 0, off = 0 Kumar Kartikeya Dwivedi
2021-09-30 6:29 ` [PATCH bpf-next v6 8/9] libbpf: Update gen_loader to emit BTF_KIND_FUNC relocations Kumar Kartikeya Dwivedi
2021-10-01 19:56 ` Alexei Starovoitov
2021-09-30 6:29 ` [PATCH bpf-next v6 9/9] bpf: selftests: Add selftests for module kfunc support Kumar Kartikeya Dwivedi
2021-10-01 22:13 ` Andrii Nakryiko
2021-10-01 22:16 ` Kumar Kartikeya Dwivedi
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