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Thu, 16 Oct 2025 13:45:06 -0700 (PDT) Received: from localhost ([2a03:2880:ff:4c::]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29099aab735sm40135795ad.77.2025.10.16.13.45.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Oct 2025 13:45:06 -0700 (PDT) From: Amery Hung To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, alexei.starovoitov@gmail.com, andrii@kernel.org, daniel@iogearbox.net, tj@kernel.org, martin.lau@kernel.org, ameryhung@gmail.com, kernel-team@meta.com Subject: [PATCH v2 bpf-next 3/4] libbpf: Add bpf_prog_assoc_struct_ops() API Date: Thu, 16 Oct 2025 13:45:02 -0700 Message-ID: <20251016204503.3203690-4-ameryhung@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251016204503.3203690-1-ameryhung@gmail.com> References: <20251016204503.3203690-1-ameryhung@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add low-level wrapper API for BPF_PROG_ASSOC_STRUCT_OPS command in the bpf() syscall. Signed-off-by: Amery Hung --- tools/lib/bpf/bpf.c | 19 +++++++++++++++++++ tools/lib/bpf/bpf.h | 20 ++++++++++++++++++++ tools/lib/bpf/libbpf.map | 1 + 3 files changed, 40 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 339b19797237..020149da30dd 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -1397,3 +1397,22 @@ int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len, err = sys_bpf(BPF_PROG_STREAM_READ_BY_FD, &attr, attr_sz); return libbpf_err_errno(err); } + +int bpf_prog_assoc_struct_ops(int map_fd, int prog_fd, + struct bpf_prog_assoc_struct_ops_opts *opts) +{ + const size_t attr_sz = offsetofend(union bpf_attr, prog_assoc_struct_ops); + union bpf_attr attr; + int err; + + if (!OPTS_VALID(opts, bpf_prog_assoc_struct_ops_opts)) + return libbpf_err(-EINVAL); + + memset(&attr, 0, attr_sz); + attr.prog_assoc_struct_ops.map_fd = map_fd; + attr.prog_assoc_struct_ops.prog_fd = prog_fd; + attr.prog_assoc_struct_ops.flags = OPTS_GET(opts, flags, 0); + + err = sys_bpf(BPF_PROG_ASSOC_STRUCT_OPS, &attr, attr_sz); + return libbpf_err_errno(err); +} diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index e983a3e40d61..14687c08772d 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -733,6 +733,26 @@ struct bpf_prog_stream_read_opts { LIBBPF_API int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len, struct bpf_prog_stream_read_opts *opts); +struct bpf_prog_assoc_struct_ops_opts { + size_t sz; + __u32 flags; + size_t :0; +}; +#define bpf_prog_assoc_struct_ops_opts__last_field flags +/** + * @brief **bpf_prog_assoc_struct_ops** associates a BPF program with a + * struct_ops map. + * + * @param map_fd FD for the struct_ops map to be associated with a BPF program + * @param prog_fd FD for the BPF program + * @param opts optional options, can be NULL + * + * @return 0 on success; negative error code, otherwise (errno is also set to + * the error code) + */ +LIBBPF_API int bpf_prog_assoc_struct_ops(int map_fd, int prog_fd, + struct bpf_prog_assoc_struct_ops_opts *opts); + #ifdef __cplusplus } /* extern "C" */ #endif diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 8ed8749907d4..e1602569426a 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -451,4 +451,5 @@ LIBBPF_1.7.0 { global: bpf_map__set_exclusive_program; bpf_map__exclusive_program; + bpf_prog_assoc_struct_ops; } LIBBPF_1.6.0; -- 2.47.3