netdev - Re: [PATCH RFC net-next 1/2] net: Reference bpf_redirect_info via task_struct on PREEMPT

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Message-ID: <20240215090428.3OW_j0S8@linutronix.de>
Date: Thu, 15 Feb 2024 10:04:28 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Toke Høiland-Jørgensen <toke@...hat.com>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org,
	Björn Töpel <bjorn@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrii Nakryiko <andrii@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Dumazet <edumazet@...gle.com>, Hao Luo <haoluo@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Jonathan Lemon <jonathan.lemon@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
	Magnus Karlsson <magnus.karlsson@...el.com>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Paolo Abeni <pabeni@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, Song Liu <song@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yonghong Song <yonghong.song@...ux.dev>
Subject: Re: [PATCH RFC net-next 1/2] net: Reference bpf_redirect_info via
 task_struct on PREEMPT_RT.

On 2024-02-14 17:13:03 [+0100], Toke Høiland-Jørgensen wrote:
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index de362d5f26559..c3f7d2a6b6134 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -4044,12 +4048,16 @@ static __always_inline struct sk_buff *
> >  sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
> >  {
> >  	struct bpf_mprog_entry *entry = rcu_dereference_bh(dev->tcx_egress);
> > +	struct bpf_xdp_storage *xdp_store __free(xdp_storage_clear) = NULL;
> >  	enum skb_drop_reason drop_reason = SKB_DROP_REASON_TC_EGRESS;
> > +	struct bpf_xdp_storage __xdp_store;
> >  	int sch_ret;
> >  
> >  	if (!entry)
> >  		return skb;
> >  
> > +	xdp_store = xdp_storage_set(&__xdp_store);
> > +
> >  	/* qdisc_skb_cb(skb)->pkt_len & tcx_set_ingress() was
> >  	 * already set by the caller.
> >  	 */
> 
> 
> These, and the LWT code, don't actually have anything to do with XDP,
> which indicates that the 'xdp_storage' name misleading. Maybe
> 'bpf_net_context' or something along those lines? Or maybe we could just
> move the flush lists into bpf_redirect_info itself and just keep that as
> the top-level name?

I'm going to rename it for now as suggested for now. If it is a better
fit to include the lists into bpf_redirect_info then I will update
accordingly.

> -Toke

Sebastian