[PATCH v2 0/6] bpf: Extend the bpf_list family of APIs

[Chengkaitao <pilgrimtao@gmail.com>]

From: Kaitao Cheng <chengkaitao@kylinos.cn>

In BPF, a list can only be used to implement a stack structure.
Due to an incomplete API set, only FIFO or LIFO operations are
supported. The patches enhance the BPF list API, making it more
list-like.

Five new kfuncs have been added:
bpf_list_del: remove a node from the list
bpf_list_add_impl: insert a node after a given list node
bpf_list_is_first: check if a node is the first in the list
bpf_list_is_last: check if a node is the last in the list
bpf_list_empty: check if the list is empty

Changes in v2:
- Remove the head parameter from bpf_list_del
- Add bpf_list_add/is_first/is_last/empty to API and test cases

Link to v1:
https://lore.kernel.org/all/20260209025250.55750-1-pilgrimtao@gmail.com/

Kaitao Cheng (6):
  bpf: Introduce the bpf_list_del kfunc.
  selftests/bpf: Add test cases for bpf_list_del
  bpf: add bpf_list_add_impl to insert node after a given list node
  selftests/bpf: Add test case for bpf_list_add_impl
  bpf: add bpf_list_is_first/last/empty kfuncs
  selftests/bpf: Add test cases for bpf_list_is_first/is_last/empty

 kernel/bpf/btf.c                              | 33 ++++++-
 kernel/bpf/helpers.c                          | 92 +++++++++++++++++++
 kernel/bpf/verifier.c                         | 28 +++++-
 .../testing/selftests/bpf/bpf_experimental.h  | 38 ++++++++
 .../selftests/bpf/progs/refcounted_kptr.c     | 87 ++++++++++++++++++
 5 files changed, 272 insertions(+), 6 deletions(-)

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