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

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Date:   Sat, 28 Oct 2023 09:06:44 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Peilin Ye <yepeilin.cs@...il.com>,
        "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>,
        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 Peilin,

On 10/27/23 9:02 PM, Peilin Ye wrote:
> 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?

Dumb question, but why all this change and not simply just call ...

   dev_lstats_add(dev, skb->len)

... on the host dev ?

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

Definitely no new stats ndo resp indirect call in fast path.

Thanks,
Daniel