From: Martin KaFai Lau <martin.lau@linux.dev>
To: thinker.li@gmail.com
Cc: sinquersw@gmail.com, kuifeng@meta.com, bpf@vger.kernel.org,
ast@kernel.org, song@kernel.org, kernel-team@meta.com,
andrii@kernel.org, drosen@google.com
Subject: Re: [PATCH bpf-next v13 07/14] bpf: pass attached BTF to the bpf_struct_ops subsystem
Date: Thu, 14 Dec 2023 18:44:09 -0800 [thread overview]
Message-ID: <4e6bff53-a219-4c69-a662-75e097100c9c@linux.dev> (raw)
In-Reply-To: <20231209002709.535966-8-thinker.li@gmail.com>
On 12/8/23 4:27 PM, thinker.li@gmail.com wrote:
> @@ -681,15 +682,30 @@ static struct bpf_map *bpf_struct_ops_map_alloc(union bpf_attr *attr)
> struct bpf_struct_ops_map *st_map;
> const struct btf_type *t, *vt;
> struct bpf_map *map;
> + struct btf *btf;
> int ret;
>
> - st_ops_desc = bpf_struct_ops_find_value(btf_vmlinux, attr->btf_vmlinux_value_type_id);
> - if (!st_ops_desc)
> - return ERR_PTR(-ENOTSUPP);
> + if (attr->value_type_btf_obj_fd) {
> + /* The map holds btf for its whole life time. */
> + btf = btf_get_by_fd(attr->value_type_btf_obj_fd);
> + if (IS_ERR(btf))
> + return ERR_PTR(PTR_ERR(btf));
return ERR_CAST(btf);
It needs to check for btf_is_module:
if (!btf_is_module(btf)) {
btf_put(btf);
return ERR_PTR(-EINVAL);
}
> + } else {
> + btf = btf_vmlinux;
> + btf_get(btf);
btf_vmlinux could be NULL or a ERR_PTR? Lets take this chance to use
bpf_get_btf_vmlinux():
btf = bpf_get_btf_vmlinux();
if (IS_ERR(btf))
return ERR_CAST(btf);
Going back to patch 4. This should be the only case that btf will be NULL or
ERR_PTR?
will continue the remaining review later tonight.
pw-bot: cr
> + }
> +
> + st_ops_desc = bpf_struct_ops_find_value(btf, attr->btf_vmlinux_value_type_id);
> + if (!st_ops_desc) {
> + ret = -ENOTSUPP;
> + goto errout;
> + }
>
> vt = st_ops_desc->value_type;
> - if (attr->value_size != vt->size)
> - return ERR_PTR(-EINVAL);
> + if (attr->value_size != vt->size) {
> + ret = -EINVAL;
> + goto errout;
> + }
>
> t = st_ops_desc->type;
>
next prev parent reply other threads:[~2023-12-15 2:44 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-09 0:26 [PATCH bpf-next v13 00/14] Registrating struct_ops types from modules thinker.li
2023-12-09 0:26 ` [PATCH bpf-next v13 01/14] bpf: refactory struct_ops type initialization to a function thinker.li
2023-12-09 0:26 ` [PATCH bpf-next v13 02/14] bpf: get type information with BPF_ID_LIST thinker.li
2023-12-15 1:59 ` Martin KaFai Lau
2023-12-09 0:26 ` [PATCH bpf-next v13 03/14] bpf, net: introduce bpf_struct_ops_desc thinker.li
2023-12-15 2:05 ` Martin KaFai Lau
2023-12-09 0:26 ` [PATCH bpf-next v13 04/14] bpf: add struct_ops_tab to btf thinker.li
2023-12-15 2:22 ` Martin KaFai Lau
2023-12-15 21:42 ` Kui-Feng Lee
2023-12-16 1:19 ` Martin KaFai Lau
2023-12-16 5:43 ` Kui-Feng Lee
2023-12-16 16:48 ` Martin KaFai Lau
2023-12-17 7:09 ` Kui-Feng Lee
2023-12-09 0:27 ` [PATCH bpf-next v13 05/14] bpf: make struct_ops_map support btfs other than btf_vmlinux thinker.li
2023-12-09 0:27 ` [PATCH bpf-next v13 06/14] bpf: lookup struct_ops types from a given module BTF thinker.li
2023-12-09 0:27 ` [PATCH bpf-next v13 07/14] bpf: pass attached BTF to the bpf_struct_ops subsystem thinker.li
2023-12-15 2:44 ` Martin KaFai Lau [this message]
2023-12-15 22:10 ` Kui-Feng Lee
2023-12-16 0:19 ` Martin KaFai Lau
2023-12-16 5:55 ` Kui-Feng Lee
2023-12-16 6:07 ` Kui-Feng Lee
2023-12-16 16:41 ` Martin KaFai Lau
2023-12-16 19:38 ` Kui-Feng Lee
2023-12-09 0:27 ` [PATCH bpf-next v13 08/14] bpf: hold module for bpf_struct_ops_map thinker.li
2023-12-15 5:54 ` Martin KaFai Lau
2023-12-15 23:25 ` Kui-Feng Lee
2023-12-09 0:27 ` [PATCH bpf-next v13 09/14] bpf: validate value_type thinker.li
2023-12-15 6:02 ` Martin KaFai Lau
2023-12-15 23:52 ` Kui-Feng Lee
2023-12-09 0:27 ` [PATCH bpf-next v13 10/14] bpf, net: switch to dynamic registration thinker.li
2023-12-15 6:51 ` Martin KaFai Lau
2023-12-09 0:27 ` [PATCH bpf-next v13 11/14] libbpf: Find correct module BTFs for struct_ops maps and progs thinker.li
2023-12-09 0:27 ` [PATCH bpf-next v13 12/14] bpf: export btf_ctx_access to modules thinker.li
2023-12-09 0:27 ` [PATCH bpf-next v13 13/14] selftests/bpf: test case for register_bpf_struct_ops() thinker.li
2023-12-15 7:17 ` Martin KaFai Lau
2023-12-17 7:32 ` Kui-Feng Lee
2023-12-09 0:27 ` [PATCH bpf-next v13 14/14] bpf: pass btf object id in bpf_map_info thinker.li
2023-12-15 7:46 ` Martin KaFai Lau
2023-12-17 7:35 ` Kui-Feng Lee
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4e6bff53-a219-4c69-a662-75e097100c9c@linux.dev \
--to=martin.lau@linux.dev \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=drosen@google.com \
--cc=kernel-team@meta.com \
--cc=kuifeng@meta.com \
--cc=sinquersw@gmail.com \
--cc=song@kernel.org \
--cc=thinker.li@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.