From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>,
<netdev@vger.kernel.org>
Subject: [PATCH bpf-next 00/15] Support calling kernel function
Date: Mon, 15 Mar 2021 18:13:36 -0700 [thread overview]
Message-ID: <20210316011336.4173585-1-kafai@fb.com> (raw)
This series adds support to allow bpf program calling kernel function.
The use case included in this set is to allow bpf-tcp-cc to directly
call some tcp-cc helper functions (e.g. "tcp_cong_avoid_ai()"). Those
functions have already been used by some kernel tcp-cc implementations.
This set will also allow the bpf-tcp-cc program to directly call the
kernel tcp-cc implementation, For example, a bpf_dctcp may only want to
implement its own dctcp_cwnd_event() and reuse other dctcp_*() directly
from the kernel tcp_dctcp.c instead of reimplementing (or
copy-and-pasting) them.
The tcp-cc kernel functions mentioned above will be white listed
for the struct_ops bpf-tcp-cc programs to use in a later patch.
The white listed functions are not bounded to a fixed ABI contract.
Those functions have already been used by the existing kernel tcp-cc.
If any of them has changed, both in-tree and out-of-tree kernel tcp-cc
implementations have to be changed. The same goes for the struct_ops
bpf-tcp-cc programs which have to be adjusted accordingly.
Please see individual patch for details.
Martin KaFai Lau (15):
bpf: Simplify freeing logic in linfo and jited_linfo
bpf: btf: Support parsing extern func
bpf: Refactor btf_check_func_arg_match
bpf: Support bpf program calling kernel function
bpf: Support kernel function call in x86-32
tcp: Rename bictcp function prefix to cubictcp
bpf: tcp: White list some tcp cong functions to be called by
bpf-tcp-cc
libbpf: Refactor bpf_object__resolve_ksyms_btf_id
libbpf: Refactor codes for finding btf id of a kernel symbol
libbpf: Rename RELO_EXTERN to RELO_EXTERN_VAR
libbpf: Record extern sym relocation first
libbpf: Support extern kernel function
bpf: selftests: Rename bictcp to bpf_cubic
bpf: selftest: bpf_cubic and bpf_dctcp calling kernel functions
bpf: selftest: Add kfunc_call test
arch/x86/net/bpf_jit_comp.c | 5 +
arch/x86/net/bpf_jit_comp32.c | 198 +++++++++
include/linux/bpf.h | 24 ++
include/linux/btf.h | 6 +
include/linux/filter.h | 4 +-
include/uapi/linux/bpf.h | 4 +
kernel/bpf/btf.c | 270 ++++++++-----
kernel/bpf/core.c | 47 +--
kernel/bpf/disasm.c | 32 +-
kernel/bpf/disasm.h | 3 +-
kernel/bpf/syscall.c | 4 +-
kernel/bpf/verifier.c | 380 ++++++++++++++++--
net/bpf/test_run.c | 11 +
net/core/filter.c | 11 +
net/ipv4/bpf_tcp_ca.c | 41 ++
net/ipv4/tcp_cubic.c | 24 +-
tools/bpf/bpftool/xlated_dumper.c | 3 +-
tools/include/uapi/linux/bpf.h | 4 +
tools/lib/bpf/btf.c | 32 +-
tools/lib/bpf/btf.h | 5 +
tools/lib/bpf/libbpf.c | 316 ++++++++++-----
tools/testing/selftests/bpf/bpf_tcp_helpers.h | 29 +-
tools/testing/selftests/bpf/prog_tests/btf.c | 154 ++++++-
.../selftests/bpf/prog_tests/kfunc_call.c | 61 +++
tools/testing/selftests/bpf/progs/bpf_cubic.c | 36 +-
tools/testing/selftests/bpf/progs/bpf_dctcp.c | 22 +-
.../selftests/bpf/progs/kfunc_call_test.c | 48 +++
.../bpf/progs/kfunc_call_test_subprog.c | 31 ++
28 files changed, 1454 insertions(+), 351 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/kfunc_call.c
create mode 100644 tools/testing/selftests/bpf/progs/kfunc_call_test.c
create mode 100644 tools/testing/selftests/bpf/progs/kfunc_call_test_subprog.c
--
2.30.2
next reply other threads:[~2021-03-16 1:14 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 1:13 Martin KaFai Lau [this message]
2021-03-16 1:13 ` [PATCH bpf-next 01/15] bpf: Simplify freeing logic in linfo and jited_linfo Martin KaFai Lau
2021-03-16 1:13 ` [PATCH bpf-next 02/15] bpf: btf: Support parsing extern func Martin KaFai Lau
2021-03-18 22:53 ` Andrii Nakryiko
2021-03-18 23:39 ` Martin KaFai Lau
2021-03-19 4:13 ` Andrii Nakryiko
2021-03-19 5:29 ` Martin KaFai Lau
2021-03-19 21:27 ` Andrii Nakryiko
2021-03-19 22:19 ` Martin KaFai Lau
2021-03-19 22:29 ` Andrii Nakryiko
2021-03-19 22:45 ` Martin KaFai Lau
2021-03-19 23:02 ` Andrii Nakryiko
2021-03-20 0:13 ` Martin KaFai Lau
2021-03-20 17:18 ` Andrii Nakryiko
2021-03-23 4:55 ` Martin KaFai Lau
2021-03-16 1:13 ` [PATCH bpf-next 03/15] bpf: Refactor btf_check_func_arg_match Martin KaFai Lau
2021-03-18 23:32 ` Andrii Nakryiko
2021-03-19 19:32 ` Martin KaFai Lau
2021-03-19 21:51 ` Andrii Nakryiko
2021-03-20 0:10 ` Alexei Starovoitov
2021-03-20 17:13 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 04/15] bpf: Support bpf program calling kernel function Martin KaFai Lau
2021-03-19 1:03 ` Andrii Nakryiko
2021-03-19 1:51 ` Alexei Starovoitov
2021-03-19 19:47 ` Martin KaFai Lau
2021-03-16 1:14 ` [PATCH bpf-next 05/15] bpf: Support kernel function call in x86-32 Martin KaFai Lau
2021-03-16 1:14 ` [PATCH bpf-next 06/15] tcp: Rename bictcp function prefix to cubictcp Martin KaFai Lau
2021-03-16 1:14 ` [PATCH bpf-next 07/15] bpf: tcp: White list some tcp cong functions to be called by bpf-tcp-cc Martin KaFai Lau
2021-03-19 1:19 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 08/15] libbpf: Refactor bpf_object__resolve_ksyms_btf_id Martin KaFai Lau
2021-03-19 2:53 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 09/15] libbpf: Refactor codes for finding btf id of a kernel symbol Martin KaFai Lau
2021-03-19 3:14 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 10/15] libbpf: Rename RELO_EXTERN to RELO_EXTERN_VAR Martin KaFai Lau
2021-03-19 3:15 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 11/15] libbpf: Record extern sym relocation first Martin KaFai Lau
2021-03-19 3:16 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 12/15] libbpf: Support extern kernel function Martin KaFai Lau
2021-03-19 4:11 ` Andrii Nakryiko
2021-03-19 5:06 ` Martin KaFai Lau
2021-03-19 21:38 ` Andrii Nakryiko
2021-03-16 1:14 ` [PATCH bpf-next 13/15] bpf: selftests: Rename bictcp to bpf_cubic Martin KaFai Lau
2021-03-19 4:14 ` Andrii Nakryiko
2021-03-16 1:15 ` [PATCH bpf-next 14/15] bpf: selftest: bpf_cubic and bpf_dctcp calling kernel functions Martin KaFai Lau
2021-03-19 4:15 ` Andrii Nakryiko
2021-03-16 1:15 ` [PATCH bpf-next 15/15] bpf: selftest: Add kfunc_call test Martin KaFai Lau
2021-03-16 3:39 ` kernel test robot
2021-03-19 4:21 ` Andrii Nakryiko
2021-03-19 5:40 ` Martin KaFai Lau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210316011336.4173585-1-kafai@fb.com \
--to=kafai@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=kernel-team@fb.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).