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SubjectRe: [PATCH v6 bpf-next 03/11] tcp: Keep TCP_CLOSE sockets in the reuseport group.
On Mon, May 17, 2021 at 09:22:50AM +0900, Kuniyuki Iwashima wrote:

> +static int reuseport_resurrect(struct sock *sk, struct sock_reuseport *old_reuse,
> + struct sock_reuseport *reuse, bool bind_inany)
> +{
> + if (old_reuse == reuse) {
> + /* If sk was in the same reuseport group, just pop sk out of
> + * the closed section and push sk into the listening section.
> + */
> + __reuseport_detach_closed_sock(sk, old_reuse);
> + __reuseport_add_sock(sk, old_reuse);
> + return 0;
> + }
> +
> + if (!reuse) {
> + /* In bind()/listen() path, we cannot carry over the eBPF prog
> + * for the shutdown()ed socket. In setsockopt() path, we should
> + * not change the eBPF prog of listening sockets by attaching a
> + * prog to the shutdown()ed socket. Thus, we will allocate a new
> + * reuseport group and detach sk from the old group.
> + */
For the reuseport_attach_prog() path, I think it needs to consider
the reuse->num_closed_socks != 0 case also and that should belong
to the resurrect case. For example, when
sk_unhashed(sk) but sk->sk_reuseport == 0.

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