From: Yonghong Song <yhs@fb.com>
To: Andrii Nakryiko <andriin@fb.com>, <bpf@vger.kernel.org>,
Martin KaFai Lau <kafai@fb.com>, <netdev@vger.kernel.org>
Cc: Alexei Starovoitov <ast@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>
Subject: [PATCH bpf-next v3 17/21] tools/libpf: add offsetof/container_of macro in bpf_helpers.h
Date: Wed, 6 May 2020 22:39:35 -0700 [thread overview]
Message-ID: <20200507053935.1545181-1-yhs@fb.com> (raw)
In-Reply-To: <20200507053915.1542140-1-yhs@fb.com>
These two helpers will be used later in bpf_iter bpf program
bpf_iter_netlink.c. Put them in bpf_helpers.h since they could
be useful in other cases.
Signed-off-by: Yonghong Song <yhs@fb.com>
---
tools/lib/bpf/bpf_helpers.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index da00b87aa199..f67dce2af802 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -36,6 +36,20 @@
#define __weak __attribute__((weak))
#endif
+/*
+ * Helper macro to manipulate data structures
+ */
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
+#endif
+#ifndef container_of
+#define container_of(ptr, type, member) \
+ ({ \
+ void *__mptr = (void *)(ptr); \
+ ((type *)(__mptr - offsetof(type, member))); \
+ })
+#endif
+
/*
* Helper structure used by eBPF C program
* to describe BPF map attributes to libbpf loader
--
2.24.1
next prev parent reply other threads:[~2020-05-07 5:39 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-07 5:39 [PATCH bpf-next v3 00/21] bpf: implement bpf iterator for kernel data Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 01/21] bpf: implement an interface to register bpf_iter targets Yonghong Song
2020-05-08 18:18 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 02/21] bpf: allow loading of a bpf_iter program Yonghong Song
2020-05-08 18:20 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 03/21] bpf: support bpf tracing/iter programs for BPF_LINK_CREATE Yonghong Song
2020-05-08 18:24 ` Andrii Nakryiko
2020-05-09 1:36 ` Yonghong Song
2020-05-12 3:15 ` Andrii Nakryiko
2020-05-13 16:57 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 04/21] bpf: support bpf tracing/iter programs for BPF_LINK_UPDATE Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 05/21] bpf: implement bpf_seq_read() for bpf iterator Yonghong Song
2020-05-08 18:52 ` Andrii Nakryiko
2020-05-09 1:41 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 06/21] bpf: create anonymous " Yonghong Song
2020-05-08 18:57 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 07/21] bpf: create file " Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 08/21] bpf: implement common macros/helpers for target iterators Yonghong Song
2020-05-08 19:07 ` Andrii Nakryiko
2020-05-09 3:18 ` Yonghong Song
2020-05-12 3:16 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 09/21] bpf: add bpf_map iterator Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 10/21] net: bpf: add netlink and ipv6_route bpf_iter targets Yonghong Song
2020-05-08 19:17 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 11/21] bpf: add task and task/file iterator targets Yonghong Song
2020-05-08 19:36 ` Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 12/21] bpf: add PTR_TO_BTF_ID_OR_NULL support Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 13/21] bpf: add bpf_seq_printf and bpf_seq_write helpers Yonghong Song
2020-05-08 19:44 ` Andrii Nakryiko
2020-05-09 4:18 ` Yonghong Song
2020-05-09 5:30 ` Alexei Starovoitov
2020-05-09 6:04 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 14/21] bpf: handle spilled PTR_TO_BTF_ID properly when checking stack_boundary Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 15/21] bpf: support variable length array in tracing programs Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 16/21] tools/libbpf: add bpf_iter support Yonghong Song
2020-05-08 19:46 ` Andrii Nakryiko
2020-05-07 5:39 ` Yonghong Song [this message]
2020-05-08 19:48 ` [PATCH bpf-next v3 17/21] tools/libpf: add offsetof/container_of macro in bpf_helpers.h Andrii Nakryiko
2020-05-07 5:39 ` [PATCH bpf-next v3 18/21] tools/bpftool: add bpf_iter support for bptool Yonghong Song
2020-05-08 19:51 ` Andrii Nakryiko
2020-05-09 5:26 ` Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 19/21] tools/bpf: selftests: add iterator programs for ipv6_route and netlink Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 20/21] tools/bpf: selftests: add iter progs for bpf_map/task/task_file Yonghong Song
2020-05-07 5:39 ` [PATCH bpf-next v3 21/21] tools/bpf: selftests: add bpf_iter selftests Yonghong Song
2020-05-08 19:57 ` Andrii Nakryiko
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