kernel/linux.git/tools/lib/bpf/bpf.h, branch linux-7.0.y

libbpf: Add BPF_F_CPU and BPF_F_ALL_CPUS flags support for percpu maps

2026-01-07T04:48:32+00:00

Add libbpf support for the BPF_F_CPU flag for percpu maps by embedding the cpu info into the high 32 bits of: 1. **flags**: bpf_map_lookup_elem_flags(), bpf_map__lookup_elem(), bpf_map_update_elem() and bpf_map__update_elem() 2. **opts->elem_flags**: bpf_map_lookup_batch() and bpf_map_update_batch() And the flag can be BPF_F_ALL_CPUS, but cannot be 'BPF_F_CPU | BPF_F_ALL_CPUS'. Behavior: * If the flag is BPF_F_ALL_CPUS, the update is applied across all CPUs. * If the flag is BPF_F_CPU, it updates value only to the specified CPU. * If the flag is BPF_F_CPU, lookup value only from the specified CPU. * lookup does not support BPF_F_ALL_CPUS. Acked-by: Andrii Nakryiko Signed-off-by: Leon Hwang Link: https://lore.kernel.org/r/20260107022022.12843-7-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov

libbpf: Add support for associating BPF program with struct_ops

2025-12-06T00:17:57+00:00

Add low-level wrapper and libbpf API for BPF_PROG_ASSOC_STRUCT_OPS command in the bpf() syscall. Signed-off-by: Amery Hung Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20251203233748.668365-4-ameryhung@gmail.com

libbpf: Support exclusive map creation

2025-09-19T02:11:42+00:00

Implement setters and getters that allow map to be registered as exclusive to the specified program. The registration should be done before the exclusive program is loaded. Signed-off-by: KP Singh Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20250914215141.15144-5-kpsingh@kernel.org Signed-off-by: Alexei Starovoitov

libbpf: Introduce bpf_prog_stream_read() API

2025-07-04T02:30:07+00:00

Introduce a libbpf API so that users can read data from a given BPF stream for a BPF prog fd. For now, only the low-level syscall wrapper is provided, we can add a bpf_program__* accessor as a follow up if needed. Acked-by: Andrii Nakryiko Acked-by: Eduard Zingerman Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20250703204818.925464-11-memxor@gmail.com Signed-off-by: Alexei Starovoitov

libbpf: Support link-based cgroup attach with options

2025-06-09T23:28:30+00:00

Currently libbpf supports bpf_program__attach_cgroup() with signature: LIBBPF_API struct bpf_link * bpf_program__attach_cgroup(const struct bpf_program *prog, int cgroup_fd); To support mprog style attachment, additionsl fields like flags, relative_{fd,id} and expected_revision are needed. Add a new API: LIBBPF_API struct bpf_link * bpf_program__attach_cgroup_opts(const struct bpf_program *prog, int cgroup_fd, const struct bpf_cgroup_opts *opts); where bpf_cgroup_opts contains all above needed fields. Signed-off-by: Yonghong Song Signed-off-by: Andrii Nakryiko Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20250606163146.2429212-1-yonghong.song@linux.dev

libbpf: Pass BPF token from find_prog_btf_id to BPF_BTF_GET_FD_BY_ID

2025-03-17T20:45:12+00:00

Pass BPF token from bpf_program__set_attach_target to BPF_BTF_GET_FD_BY_ID bpf command. When freplace program attaches to target program, it needs to look up for BTF of the target, this may require BPF token, if, for example, running from user namespace. Signed-off-by: Mykyta Yatsenko Signed-off-by: Andrii Nakryiko Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20250317174039.161275-4-mykyta.yatsenko5@gmail.com

libbpf: prog load: Allow to use fd_array_cnt

2024-12-13T22:48:39+00:00

Add new fd_array_cnt field to bpf_prog_load_opts and pass it in bpf_attr, if set. Signed-off-by: Anton Protopopov Signed-off-by: Andrii Nakryiko Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20241213130934.1087929-6-aspsk@isovalent.com

libbpf: fix some typos in libbpf

2024-09-05T20:07:47+00:00

Hi, fix some spelling errors in libbpf, the details are as follows: -in the code comments: termintaing->terminating architecutre->architecture requring->requiring recored->recoded sanitise->sanities allowd->allowed abover->above see bpf_udst_arg()->see bpf_usdt_arg() Signed-off-by: Lin Yikai Link: https://lore.kernel.org/r/20240905110354.3274546-3-yikai.lin@vivo.com Signed-off-by: Alexei Starovoitov

libbpf: add support for BPF cookie for raw_tp/tp_btf programs

2024-03-20T06:05:34+00:00

Wire up BPF cookie passing or raw_tp and tp_btf programs, both in low-level and high-level APIs. Acked-by: Stanislav Fomichev Acked-by: Eduard Zingerman Signed-off-by: Andrii Nakryiko Message-ID: <20240319233852.1977493-5-andrii@kernel.org> Signed-off-by: Alexei Starovoitov

bpf: Clarify batch lookup/lookup_and_delete semantics

2024-02-22T18:24:38+00:00

The batch lookup and lookup_and_delete APIs have two parameters, in_batch and out_batch, to facilitate iterative lookup/lookup_and_deletion operations for supported maps. Except NULL for in_batch at the start of these two batch operations, both parameters need to point to memory equal or larger than the respective map key size, except for various hashmaps (hash, percpu_hash, lru_hash, lru_percpu_hash) where the in_batch/out_batch memory size should be at least 4 bytes. Document these semantics to clarify the API. Signed-off-by: Martin Kelly Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20240221211838.1241578-1-martin.kelly@crowdstrike.com Signed-off-by: Martin KaFai Lau