netdev - Re: [PATCH bpf-next v2 8/9] libbpf: add support for the multi-link of tracing

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Date: Mon, 11 Mar 2024 18:56:18 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Menglong Dong <dongmenglong.8@...edance.com>
Cc: Andrii Nakryiko <andrii@...nel.org>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <martin.lau@...ux.dev>, Eddy Z <eddyz87@...il.com>, 
	Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, 
	John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	Alexander Gordeev <agordeev@...ux.ibm.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Sven Schnelle <svens@...ux.ibm.com>, "David S. Miller" <davem@...emloft.net>, 
	David Ahern <dsahern@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	X86 ML <x86@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Quentin Monnet <quentin@...valent.com>, 
	bpf <bpf@...r.kernel.org>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, 
	linux-riscv <linux-riscv@...ts.infradead.org>, linux-s390 <linux-s390@...r.kernel.org>, 
	Network Development <netdev@...r.kernel.org>, linux-trace-kernel@...r.kernel.org, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH bpf-next v2 8/9] libbpf: add support for the multi-link of tracing

On Mon, Mar 11, 2024 at 2:35 AM Menglong Dong
<dongmenglong.8@...edance.com> wrote:
>
>
> -               err = libbpf_find_attach_btf_id(prog, attach_name, &btf_obj_fd, &btf_type_id);
> +               name_end = strchr(attach_name, ',');
> +               /* for multi-link tracing, use the first target symbol during
> +                * loading.
> +                */
> +               if ((def & SEC_ATTACH_BTF_MULTI) && name_end) {
> +                       int len = name_end - attach_name + 1;
> +                       char *first_tgt;
> +
> +                       first_tgt = malloc(len);
> +                       if (!first_tgt)
> +                               return -ENOMEM;
> +                       strncpy(first_tgt, attach_name, len);
> +                       first_tgt[len - 1] = '\0';
> +                       err = libbpf_find_attach_btf_id(prog, first_tgt, &btf_obj_fd,
> +                                                       &btf_type_id);
> +                       free(first_tgt);
> +               } else {
> +                       err = libbpf_find_attach_btf_id(prog, attach_name, &btf_obj_fd,
> +                                                       &btf_type_id);
> +               }

Pls use glob_match the way [ku]probe multi are doing
instead of exact match.