linux-kernel - [PATCH bpf-next v5 0/2] Implement mechanism to signal other threads

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Message-Id: <20241016084136.10305-1-puranjay@kernel.org>
Date: Wed, 16 Oct 2024 08:41:34 +0000
From: Puranjay Mohan <puranjay@...nel.org>
To: 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>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	puranjay12@...il.com
Subject: [PATCH bpf-next v5 0/2] Implement mechanism to signal other threads

This set implements a kfunc called bpf_send_signal_task() that is similar
to sigqueue() as it can send a signal along with a cookie to a thread or
thread group.

The send_signal selftest has been updated to also test this new kfunc under
all contexts.

Changes in v5:
v4: https://lore.kernel.org/all/20241008114940.44305-1-puranjay@kernel.org/
- Call copy_siginfo() only if work->has_siginfo is true in
  bpf_send_signal_common()
- Add Acked-by: Andrii Nakryiko <andrii@...nel.org>

Changes in v4:
v3: https://lore.kernel.org/all/20241007103426.128923-1-puranjay@kernel.org/
- Fix the selftest to make it work for big-endian archs.
- Fix a build warning on 32-bit archs.
- Some style changes and code refactors suggested by Andrii

Changes in v3:
v2: https://lore.kernel.org/all/20240926115328.105634-1-puranjay@kernel.org/
- make the cookie u64 instead of int.
- re use code from bpf_send_signal_common

Changes in v2:
v1: https://lore.kernel.org/bpf/20240724113944.75977-1-puranjay@kernel.org/
- Convert to a kfunc
- Add mechanism to send a cookie with the signal.

Puranjay Mohan (2):
  bpf: implement bpf_send_signal_task() kfunc
  selftests/bpf: Augment send_signal test with remote signaling

 kernel/bpf/helpers.c                          |   1 +
 kernel/trace/bpf_trace.c                      |  53 +++++--
 .../selftests/bpf/prog_tests/send_signal.c    | 133 +++++++++++++-----
 .../bpf/progs/test_send_signal_kern.c         |  35 ++++-
 4 files changed, 176 insertions(+), 46 deletions(-)

-- 
2.40.1