netdev - Re: [PATCH bpf-next v6 00/10] bpf: fsession support

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Message-ID: <aVzN28i92roV1p4q@krava>
Date: Tue, 6 Jan 2026 09:54:51 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Menglong Dong <menglong8.dong@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <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@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, jiang.biao@...ux.dev,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, X86 ML <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, bpf <bpf@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v6 00/10] bpf: fsession support

On Mon, Jan 05, 2026 at 03:20:13PM -0800, Andrii Nakryiko wrote:
> On Mon, Jan 5, 2026 at 2:33 PM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:
> >
> > On Sun, Jan 4, 2026 at 4:28 AM Menglong Dong <menglong8.dong@...il.com> wrote:
> > >
> > > In current solution, we can't reuse the existing bpf_session_cookie() and
> > > bpf_session_is_return(), as their prototype is different from
> > > bpf_fsession_is_return() and bpf_fsession_cookie(). In
> > > bpf_fsession_cookie(), we need the function argument "void *ctx" to get
> > > the cookie. However, the prototype of bpf_session_cookie() is "void".
> >
> > I think it's ok to change proto to bpf_session_cookie(void *ctx)
> > for kprobe-session. It's not widely used yet, so proto change is ok
> > if it helps to simplify this tramp-session code.
> > I see that you adjust get_kfunc_ptr_arg_type(), so the verifier
> > will enforce PTR_TO_CTX for kprobe and trampoline.
> > Potentially can relax and enforce r1==ctx only for trampoline,
> > but I would do it for both for consistency.
> 
> Yeah, I'd support that. It's early enough that this shouldn't be
> breaking a lot of users (if any).
> 
> Jiri, do you guys use bpf_session_is_return() or bpf_session_cookie()
> anywhere already?

np, we can still adjust, it's in PR that's not merged yet

jirka