netdev - Re: [PATCH bpf-next v6 4/8] net: remove duplicate reuseport

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Date: Mon, 24 Jul 2023 15:55:49 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Lorenz Bauer <lmb@...valent.com>
Cc: Hemanth Malla <hemanthmalla@...il.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>, Song Liu <song@...nel.org>,
 Yonghong Song <yhs@...com>, 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>,
 Joe Stringer <joe@...d.net.nz>, Mykola Lysenko <mykolal@...com>,
 Shuah Khan <shuah@...nel.org>, Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [PATCH bpf-next v6 4/8] net: remove duplicate reuseport_lookup
 functions

On 7/20/23 8:30 AM, Lorenz Bauer wrote:
> @@ -452,7 +436,14 @@ static struct sock *udp4_lib_lookup2(struct net *net,
>   				      daddr, hnum, dif, sdif);
>   		if (score > badness) {
>   			badness = score;
> -			result = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum);
> +
> +			if (sk->sk_state == TCP_ESTABLISHED) {
> +				result = sk;
> +				continue;
> +			}

Thanks for the cleanup. I also found moving the TCP_ESTABLISHED check here made 
the score logic easier to reason.