netdev - Re: [PATCH RFC v1 net-next 1/4] net: Introduce Qdisc backpressure infrastructure

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Message-ID: <20220506133111.1d4bebf3@hermes.local>
Date:   Fri, 6 May 2022 13:31:11 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Peilin Ye <peilin.ye@...edance.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH RFC v1 net-next 1/4] net: Introduce Qdisc backpressure
 infrastructure

On Fri,  6 May 2022 12:44:22 -0700
Peilin Ye <yepeilin.cs@...il.com> wrote:

> +static inline void qdisc_backpressure_overlimit(struct Qdisc *sch, struct sk_buff *skb)
> +{
> +	struct sock *sk = skb->sk;
> +
> +	if (!sk || !sk_fullsock(sk))
> +		return;
> +
> +	if (cmpxchg(&sk->sk_backpressure_status, SK_UNTHROTTLED, SK_OVERLIMIT) == SK_UNTHROTTLED) {
> +		sock_hold(sk);
> +		list_add_tail(&sk->sk_backpressure_node, &sch->backpressure_list);
> +	}
> +}

What if socket is closed? You are holding reference but application maybe gone.

Or if output is stalled indefinitely?