netdev - [PATCH bpf-next 0/3] bpf: introduce skb refcount kfuncs

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Message-Id: <20250220134503.835224-1-maciej.fijalkowski@intel.com>
Date: Thu, 20 Feb 2025 14:45:00 +0100
From: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To: bpf@...r.kernel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org
Cc: netdev@...r.kernel.org,
	magnus.karlsson@...el.com,
	martin.lau@...ux.dev,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Subject: [PATCH bpf-next 0/3] bpf: introduce skb refcount kfuncs

Hi!

This patchset provides what is needed for storing skbs as kptrs in bpf
maps. We start with necessary kernel change as discussed at [0] with
Martin, then next patch adds kfuncs for handling skb refcount and on top
of that a test case is added where one program stores skbs and then next
program is able to retrieve them from map.

Martin, regarding the kernel change I decided to go with boolean
approach instead of what you initially suggested. Let me know if it
works for you.

Thanks,
Maciej

[0]: https://lore.kernel.org/bpf/Z0X%2F9PhIhvQwsgfW@boxer/

Maciej Fijalkowski (3):
  bpf: call btf_is_projection_of() conditionally
  bpf: add kfunc for skb refcounting
  selftests: bpf: implement test case for skb kptr map storage

 include/linux/btf.h                           |  4 +-
 kernel/bpf/btf.c                              | 11 +--
 kernel/bpf/verifier.c                         |  3 +-
 net/core/filter.c                             | 62 +++++++++++++++
 .../selftests/bpf/prog_tests/skb_map_kptrs.c  | 75 ++++++++++++++++++
 .../selftests/bpf/progs/skb_map_kptrs.c       | 77 +++++++++++++++++++
 6 files changed, 224 insertions(+), 8 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/skb_map_kptrs.c
 create mode 100644 tools/testing/selftests/bpf/progs/skb_map_kptrs.c

-- 
2.43.0