linux-kernel - Re: [PATCH 6.8 119/715] libbpf: Add bpf_token

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Date: Mon, 25 Mar 2024 12:17:56 +0100
From: Thorsten Leemhuis <linux@...mhuis.info>
To: Jiri Slaby <jirislaby@...nel.org>, Sasha Levin <sashal@...nel.org>,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Andrii Nakryiko <andrii@...nel.org>, Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH 6.8 119/715] libbpf: Add bpf_token_create() API

A quick "me too" from my side below:

On 25.03.24 06:40, Jiri Slaby wrote:
> On 24. 03. 24, 23:24, Sasha Levin wrote:
>> From: Andrii Nakryiko <andrii@...nel.org>
>>
>> [ Upstream commit 639ecd7d6247c48a0175f5b458b648f5d4b6dc34 ]
>>
>> Add low-level wrapper API for BPF_TOKEN_CREATE command in bpf() syscall.
>>
>> Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
>> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
>> Link:
>> https://lore.kernel.org/bpf/20240124022127.2379740-13-andrii@kernel.org
>> Stable-dep-of: c81a8ab196b5 ("libbpf: Add btf__new_split() API that
>> was declared but not implemented")
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>   tools/lib/bpf/bpf.c      | 17 +++++++++++++++++
>>   tools/lib/bpf/bpf.h      | 24 ++++++++++++++++++++++++
>>   tools/lib/bpf/libbpf.map |  1 +
>>   3 files changed, 42 insertions(+)
>>
>> diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
>> index 9dc9625651dcf..d4019928a8646 100644
>> --- a/tools/lib/bpf/bpf.c
>> +++ b/tools/lib/bpf/bpf.c
>> @@ -1287,3 +1287,20 @@ int bpf_prog_bind_map(int prog_fd, int map_fd,
>>       ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz);
>>       return libbpf_err_errno(ret);
>>   }
>> +
>> +int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts)
>> +{
>> +    const size_t attr_sz = offsetofend(union bpf_attr, token_create);
>> +    union bpf_attr attr;
>> +    int fd;
>> +
>> +    if (!OPTS_VALID(opts, bpf_token_create_opts))
>> +        return libbpf_err(-EINVAL);
>> +
>> +    memset(&attr, 0, attr_sz);
>> +    attr.token_create.bpffs_fd = bpffs_fd;
>> +    attr.token_create.flags = OPTS_GET(opts, flags, 0);
> 
> With openSUSE config [1], I see:
> bpf.c:1293:60: error: ‘union bpf_attr’ has no member named
> ‘token_create’; did you mean ‘iter_create’?
> bpf.c:1293:60: error: ‘union bpf_attr’ has no member named
> ‘token_create’; did you mean ‘iter_create’?
> bpf.c:1301:14: error: ‘union bpf_attr’ has no member named
> ‘token_create’; did you mean ‘iter_create’?
> bpf.c:1302:14: error: ‘union bpf_attr’ has no member named
> ‘token_create’; did you mean ‘iter_create’?
> 
> 
> [1]
> https://github.com/openSUSE/kernel-source/blob/master/config/x86_64/default
> 
>> +    fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz);
> 
> And:
> 
> bpf.c:1304:25: error: ‘BPF_TOKEN_CREATE’ undeclared (first use in this
> function); did you mean ‘BPF_ITER_CREATE’?
> 
> They are added by:
> commit 35f96de04127d332a5c5e8a155d31f452f88c76d
> Author: Andrii Nakryiko <andrii@...nel.org>
> Date:   Tue Jan 23 18:21:00 2024 -0800
> 
>     bpf: Introduce BPF token object
> 
> 
> But if you should take it or drop this all, I don't know...

I ran into the same problems while building 6.8.2-rc1 for Fedora using
the Fedora 39 config and its RPM spec file (with minor modifications):

https://download.copr.fedorainfracloud.org/results/@kernel-vanilla/stable-rc/fedora-39-x86_64/07210895-stablerc-stablerc-releases/builder-live.log.gz

Ciao, Thorsten