netdev - [PATCH bpf-next v2 0/2] bpf: cpumap: improve error propagation in cpu_map_update

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Message-ID: <20251208131449.73036-1-enjuk@amazon.com>
Date: Mon, 8 Dec 2025 22:14:30 +0900
From: Kohei Enju <enjuk@...zon.com>
To: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>
CC: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
	<daniel@...earbox.net>, "David S. Miller" <davem@...emloft.net>, "Jakub
 Kicinski" <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, "John
 Fastabend" <john.fastabend@...il.com>, Stanislav Fomichev <sdf@...ichev.me>,
	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>, KP Singh <kpsingh@...nel.org>, Hao Luo
	<haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, Shuah Khan
	<shuah@...nel.org>, Toke Høiland-Jørgensen
	<toke@...nel.org>, <kohei.enju@...il.com>, Kohei Enju <enjuk@...zon.com>
Subject: [PATCH bpf-next v2 0/2] bpf: cpumap: improve error propagation in cpu_map_update_elem()

This series improves error propagation in cpumap and adds selftests that
cover the failure cases.

Currently, failures returned from __cpu_map_entry_alloc() are ignored
and always converted to -ENOMEM by cpu_map_update_elem(). This series
ensures the correct error propagation and adds selftests.

Changes:
  v2:
    - send to bpf-next, not to bpf
    - drop Fixes: tag
  v1: https://lore.kernel.org/bpf/20251128160504.57844-1-enjuk@amazon.com/

Kohei Enju (2):
  bpf: cpumap: propagate underlying error in cpu_map_update_elem()
  selftests/bpf: add tests for attaching invalid fd

 kernel/bpf/cpumap.c                           | 21 ++++++++++++-------
 .../bpf/prog_tests/xdp_cpumap_attach.c        | 19 +++++++++++++++--
 2 files changed, 30 insertions(+), 10 deletions(-)

-- 
2.51.0