netdev - Re: [PATCH net] veth: Fix RX stats for bpf_redirect

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Message-ID: <20231027190254.GA88444@n191-129-154.byted.org>
Date: Fri, 27 Oct 2023 19:02:59 +0000
From: Peilin Ye <yepeilin.cs@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>, 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>,
	Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Peilin Ye <peilin.ye@...edance.com>, netdev@...r.kernel.org,
	bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
	Cong Wang <cong.wang@...edance.com>,
	Jiang Wang <jiang.wang@...edance.com>,
	Youlun Zhang <zhangyoulun@...edance.com>
Subject: Re: [PATCH net] veth: Fix RX stats for bpf_redirect_peer() traffic

Hi all,

On Fri, Oct 27, 2023 at 06:46:57PM +0000, Peilin Ye wrote:
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 21d75108c2e9..7aca28b7d0fd 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -2492,6 +2492,7 @@ int skb_do_redirect(struct sk_buff *skb)
>  			     net_eq(net, dev_net(dev))))
>  			goto out_drop;
>  		skb->dev = dev;
> +		dev_sw_netstats_rx_add(dev, skb->len);

This assumes that all devices that support BPF_F_PEER (currently only
veth) use tstats (instead of lstats, or dstats) - is that okay?

If not, should I add another NDO e.g. ->ndo_stats_rx_add()?

Thanks,
Peilin Ye