linux-kernel - [PATCH bpf-next v2 0/3] bpf, arm64: Add fsession support

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Message-ID: <20260128150112.8873-1-leon.hwang@linux.dev>
Date: Wed, 28 Jan 2026 23:01:09 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: bpf@...r.kernel.org
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Puranjay Mohan <puranjay@...nel.org>,
	Xu Kuohai <xukuohai@...weicloud.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Menglong Dong <menglong8.dong@...il.com>,
	Leon Hwang <leon.hwang@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	kernel-patches-bot@...com
Subject: [PATCH bpf-next v2 0/3] bpf, arm64: Add fsession support

Similar to commit 98770bd4e6df ("bpf,x86: add fsession support for x86_64"),
add fsession support on arm64.

Patch #1 adds bpf_arch_supports_fsession() to prevent fsession loading
on architectures that do not implement fsession support.

Patch #2 implements fsession support in the arm64 BPF JIT trampoline.

Patch #3 enables the relevant selftests on arm64, including get_func_ip,
and get_func_args.

All enabled tests pass on arm64:

 cd tools/testing/selftests/bpf
 ./test_progs -t fsession
 #135/1   fsession_test/fsession_test:OK
 #135/2   fsession_test/fsession_reattach:OK
 #135/3   fsession_test/fsession_cookie:OK
 #135     fsession_test:OK
 Summary: 1/3 PASSED, 0 SKIPPED, 0 FAILED

 ./test_progs -t get_func
 #138     get_func_args_test:OK
 #139     get_func_ip_test:OK
 Summary: 2/0 PASSED, 0 SKIPPED, 0 FAILED

Changes:
v1 -> v2:
* Add bpf_arch_supports_fsession().

Leon Hwang (3):
  bpf: Add bpf_arch_supports_fsession()
  bpf, arm64: Add fsession support
  bpf/selftests: Enable get_func_args and get_func_ip tests on arm64

 arch/arm64/net/bpf_jit_comp.c                 | 71 ++++++++++++++++---
 arch/x86/net/bpf_jit_comp.c                   |  5 ++
 include/linux/bpf.h                           |  7 +-
 include/linux/filter.h                        |  1 +
 kernel/bpf/core.c                             |  5 ++
 kernel/bpf/verifier.c                         |  3 +
 .../selftests/bpf/prog_tests/fsession_test.c  | 32 ++++++---
 .../selftests/bpf/progs/get_func_args_test.c  |  2 +-
 .../selftests/bpf/progs/get_func_ip_test.c    |  2 +-
 9 files changed, 108 insertions(+), 20 deletions(-)

--
2.52.0