netdev - Re: [PATCH net-next v2 2/2] tcp: add more warn of socket in tcp_send_loss

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Message-ID: <7cc508a4-24d1-428c-bf63-ae5dbcc305bc@kernel.org>
Date: Mon, 21 Oct 2024 11:51:36 -0600
From: David Ahern <dsahern@...nel.org>
To: Jason Xing <kerneljasonxing@...il.com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, ncardwell@...gle.com
Cc: netdev@...r.kernel.org, Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v2 2/2] tcp: add more warn of socket in
 tcp_send_loss_probe()

On 10/21/24 9:52 AM, Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
> 
> Add two fields to print in the helper which here covers tcp_send_loss_probe().
> 
> Link: https://lore.kernel.org/all/5632e043-bdba-4d75-bc7e-bf58014492fd@redhat.com/
> Suggested-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Jason Xing <kernelxing@...cent.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> --
> v2
> Link:https://lore.kernel.org/all/CAL+tcoAr7RHhaZGV12wYDcPPPaubAqdxMCmy7Jujtr8b3+bY=w@mail.gmail.com/
> 1. use "" instead of NULL in tcp_send_loss_probe()
> ---
>  include/net/tcp.h     | 4 +++-
>  net/ipv4/tcp_output.c | 4 +---
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 8b8d94bb1746..78158169e944 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -2433,12 +2433,14 @@ void tcp_plb_update_state_upon_rto(struct sock *sk, struct tcp_plb_state *plb);
>  static inline void tcp_warn_once(const struct sock *sk, bool cond, const char *str)
>  {
>  	WARN_ONCE(cond,
> -		  "%sout:%u sacked:%u lost:%u retrans:%u tlp_high_seq:%u sk_state:%u ca_state:%u advmss:%u mss_cache:%u pmtu:%u\n",
> +		  "%scwn:%u out:%u sacked:%u lost:%u retrans:%u tlp_high_seq:%u sk_state:%u ca_state:%u mss:%u advmss:%u mss_cache:%u pmtu:%u\n",
>  		  str,
> +		  tcp_snd_cwnd(tcp_sk(sk)),
>  		  tcp_sk(sk)->packets_out, tcp_sk(sk)->sacked_out,
>  		  tcp_sk(sk)->lost_out, tcp_sk(sk)->retrans_out,
>  		  tcp_sk(sk)->tlp_high_seq, sk->sk_state,
>  		  inet_csk(sk)->icsk_ca_state,
> +		  tcp_current_mss((struct sock *)sk),
>  		  tcp_sk(sk)->advmss, tcp_sk(sk)->mss_cache,
>  		  inet_csk(sk)->icsk_pmtu_cookie);
>  }
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 054244ce5117..36562b5fe290 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -2954,9 +2954,7 @@ void tcp_send_loss_probe(struct sock *sk)
>  	}
>  	skb = skb_rb_last(&sk->tcp_rtx_queue);
>  	if (unlikely(!skb)) {
> -		WARN_ONCE(tp->packets_out,
> -			  "invalid inflight: %u state %u cwnd %u mss %d\n",
> -			  tp->packets_out, sk->sk_state, tcp_snd_cwnd(tp), mss);
> +		tcp_warn_once(sk, tp->packets_out, "");

you dropped the "invalid inflight: " string for context.

>  		smp_store_release(&inet_csk(sk)->icsk_pending, 0);
>  		return;
>  	}

Besides the nit:
Reviewed-by: David Ahern <dsahern@...nel.org>