netdev - Re: [PATCH bpf-next v5 01/10] bpf: add fsession support

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Message-ID: <aVe11o2SFzjEnGpw@krava>
Date: Fri, 2 Jan 2026 13:11:02 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Menglong Dong <menglong.dong@...ux.dev>
Cc: Menglong Dong <menglong8.dong@...il.com>,
	Jiri Olsa <olsajiri@...il.com>, ast@...nel.org, andrii@...nel.org,
	daniel@...earbox.net, martin.lau@...ux.dev, eddyz87@...il.com,
	song@...nel.org, yonghong.song@...ux.dev, john.fastabend@...il.com,
	kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com,
	davem@...emloft.net, dsahern@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, jiang.biao@...ux.dev, bp@...en8.de,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	bpf@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 01/10] bpf: add fsession support

On Fri, Jan 02, 2026 at 05:21:42PM +0800, Menglong Dong wrote:

SNIP

> > ---
> > diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> > index 4e7d72dfbcd4..7479664844ea 100644
> > --- a/include/linux/bpf.h
> > +++ b/include/linux/bpf.h
> > @@ -1309,6 +1309,7 @@ enum bpf_tramp_prog_type {
> >  	BPF_TRAMP_MODIFY_RETURN,
> >  	BPF_TRAMP_MAX,
> >  	BPF_TRAMP_REPLACE, /* more than MAX */
> > +	BPF_TRAMP_FSESSION,
> >  };
> >  
> >  struct bpf_tramp_image {
> > @@ -1861,6 +1862,7 @@ struct bpf_link_ops {
> >  struct bpf_tramp_link {
> >  	struct bpf_link link;
> >  	struct hlist_node tramp_hlist;
> > +	struct hlist_node extra_hlist;
> >  	u64 cookie;
> >  };
> 
> In this way, it indeed can make the update of the hlist more clear. However,
> I think that you missed the reading of the hlist as I mentioned above.
> You can't add both the "tramp_hlist" and "extra_hlist" to the same hlist. If
> so, how do we iterate the hlist? Do I miss something?

ugh, it's on the same list.. nevermind then ;-)

jirka