From: Song Liu <songliubraving@fb.com>
To: Andrii Nakryiko <andriin@fb.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Alexei Starovoitov <ast@fb.com>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
Kernel Team <Kernel-team@fb.com>
Subject: Re: [PATCH v2 bpf-next 02/11] libbpf: extract BTF loading logic
Date: Mon, 17 Jun 2019 19:40:00 +0000 [thread overview]
Message-ID: <180C0D3B-5C58-40C1-B4F1-3A20ECF39788@fb.com> (raw)
In-Reply-To: <20190617192700.2313445-3-andriin@fb.com>
> On Jun 17, 2019, at 12:26 PM, Andrii Nakryiko <andriin@fb.com> wrote:
>
> As a preparetion fro adding BTF-based BPF map loading, extract .BTF and
> .BTF.ext loading logic.
>
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
> ---
> tools/lib/bpf/libbpf.c | 93 +++++++++++++++++++++++++-----------------
> 1 file changed, 55 insertions(+), 38 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index e725fa86b189..49d3a808e754 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -1078,6 +1078,58 @@ static void bpf_object__sanitize_btf_ext(struct bpf_object *obj)
> }
> }
>
> +static int bpf_object__load_btf(struct bpf_object *obj,
> + Elf_Data *btf_data,
> + Elf_Data *btf_ext_data)
> +{
> + int err = 0;
> +
> + if (btf_data) {
> + obj->btf = btf__new(btf_data->d_buf, btf_data->d_size);
> + if (IS_ERR(obj->btf)) {
> + pr_warning("Error loading ELF section %s: %d.\n",
> + BTF_ELF_SEC, err);
> + goto out;
> + }
> + err = btf__finalize_data(obj, obj->btf);
> + if (err) {
> + pr_warning("Error finalizing %s: %d.\n",
> + BTF_ELF_SEC, err);
> + goto out;
> + }
> + bpf_object__sanitize_btf(obj);
> + err = btf__load(obj->btf);
> + if (err) {
> + pr_warning("Error loading %s into kernel: %d.\n",
> + BTF_ELF_SEC, err);
> + goto out;
> + }
> + }
> + if (btf_ext_data) {
> + if (!obj->btf) {
> + pr_debug("Ignore ELF section %s because its depending ELF section %s is not found.\n",
> + BTF_EXT_ELF_SEC, BTF_ELF_SEC);
> + goto out;
> + }
> + obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
> + btf_ext_data->d_size);
> + if (IS_ERR(obj->btf_ext)) {
> + pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
> + BTF_EXT_ELF_SEC, PTR_ERR(obj->btf_ext));
> + obj->btf_ext = NULL;
> + goto out;
> + }
> + bpf_object__sanitize_btf_ext(obj);
> + }
> +out:
> + if (err || IS_ERR(obj->btf)) {
> + if (!IS_ERR_OR_NULL(obj->btf))
> + btf__free(obj->btf);
> + obj->btf = NULL;
> + }
> + return 0;
> +}
> +
> static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
> {
> Elf *elf = obj->efile.elf;
> @@ -1212,44 +1264,9 @@ static int bpf_object__elf_collect(struct bpf_object *obj, int flags)
> pr_warning("Corrupted ELF file: index of strtab invalid\n");
> return -LIBBPF_ERRNO__FORMAT;
> }
> - if (btf_data) {
> - obj->btf = btf__new(btf_data->d_buf, btf_data->d_size);
> - if (IS_ERR(obj->btf)) {
> - pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
> - BTF_ELF_SEC, PTR_ERR(obj->btf));
> - obj->btf = NULL;
> - } else {
> - err = btf__finalize_data(obj, obj->btf);
> - if (!err) {
> - bpf_object__sanitize_btf(obj);
> - err = btf__load(obj->btf);
> - }
> - if (err) {
> - pr_warning("Error finalizing and loading %s into kernel: %d. Ignored and continue.\n",
> - BTF_ELF_SEC, err);
> - btf__free(obj->btf);
> - obj->btf = NULL;
> - err = 0;
> - }
> - }
> - }
> - if (btf_ext_data) {
> - if (!obj->btf) {
> - pr_debug("Ignore ELF section %s because its depending ELF section %s is not found.\n",
> - BTF_EXT_ELF_SEC, BTF_ELF_SEC);
> - } else {
> - obj->btf_ext = btf_ext__new(btf_ext_data->d_buf,
> - btf_ext_data->d_size);
> - if (IS_ERR(obj->btf_ext)) {
> - pr_warning("Error loading ELF section %s: %ld. Ignored and continue.\n",
> - BTF_EXT_ELF_SEC,
> - PTR_ERR(obj->btf_ext));
> - obj->btf_ext = NULL;
> - } else {
> - bpf_object__sanitize_btf_ext(obj);
> - }
> - }
> - }
> + err = bpf_object__load_btf(obj, btf_data, btf_ext_data);
> + if (err)
> + return err;
> if (bpf_object__has_maps(obj)) {
> err = bpf_object__init_maps(obj, flags);
> if (err)
> --
> 2.17.1
>
next prev parent reply other threads:[~2019-06-17 19:40 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-17 19:26 [PATCH v2 bpf-next 00/11] BTF-defined BPF map definitions Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 01/11] libbpf: add common min/max macro to libbpf_internal.h Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 02/11] libbpf: extract BTF loading logic Andrii Nakryiko
2019-06-17 19:40 ` Song Liu [this message]
2019-06-17 19:26 ` [PATCH v2 bpf-next 03/11] libbpf: streamline ELF parsing error-handling Andrii Nakryiko
2019-06-17 19:46 ` Song Liu
2019-06-17 19:26 ` [PATCH v2 bpf-next 04/11] libbpf: refactor map initialization Andrii Nakryiko
2019-06-17 19:39 ` Song Liu
2019-06-26 14:48 ` Matt Hart
2019-06-26 18:28 ` Andrii Nakryiko
2019-06-27 15:11 ` Matt Hart
2019-06-17 19:26 ` [PATCH v2 bpf-next 05/11] libbpf: identify maps by section index in addition to offset Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 06/11] libbpf: split initialization and loading of BTF Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 07/11] libbpf: allow specifying map definitions using BTF Andrii Nakryiko
2019-06-17 19:43 ` Song Liu
2019-06-17 19:26 ` [PATCH v2 bpf-next 08/11] selftests/bpf: add test for BTF-defined maps Andrii Nakryiko
2019-06-17 19:26 ` [PATCH v2 bpf-next 09/11] selftests/bpf: switch BPF_ANNOTATE_KV_PAIR tests to " Andrii Nakryiko
2019-06-17 21:41 ` Song Liu
2019-06-17 22:20 ` Daniel Borkmann
2019-06-17 19:26 ` [PATCH v2 bpf-next 10/11] selftests/bpf: convert tests w/ custom values " Andrii Nakryiko
2019-06-17 19:27 ` [PATCH v2 bpf-next 11/11] selftests/bpf: convert remaining selftests " Andrii Nakryiko
2019-06-17 21:17 ` [PATCH v2 bpf-next 00/11] BTF-defined BPF map definitions Daniel Borkmann
2019-06-17 22:17 ` Daniel Borkmann
2019-06-18 21:37 ` Andrii Nakryiko
2019-06-20 14:49 ` Lorenz Bauer
2019-06-21 4:19 ` Andrii Nakryiko
2019-06-21 10:29 ` Lorenz Bauer
2019-06-21 17:56 ` Andrii Nakryiko
2019-06-25 18:14 ` Andrii Nakryiko
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