netdev - Re: [PATCH net-next v8 08/10] tcp: add dropreasons in tcp_rcv_state

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Date: Thu, 22 Feb 2024 10:28:28 -0700
From: David Ahern <dsahern@...nel.org>
To: Jason Xing <kerneljasonxing@...il.com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, kuniyu@...zon.com
Cc: netdev@...r.kernel.org, Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v8 08/10] tcp: add dropreasons in
 tcp_rcv_state_process()

On 2/22/24 4:30 AM, Jason Xing wrote:
> @@ -6704,8 +6705,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
>  				  FLAG_NO_CHALLENGE_ACK);
>  
>  	if ((int)reason <= 0) {
> -		if (sk->sk_state == TCP_SYN_RECV)
> -			return 1;	/* send one RST */
> +		if (sk->sk_state == TCP_SYN_RECV) {
> +			/* send one RST */
> +			if (!reason)
> +				return SKB_DROP_REASON_TCP_OLD_ACK;
> +			else
> +				return -reason;

checkpatch should be flagging this - the `else` is not needed.

			if (!reason)
				return SKB_DROP_REASON_TCP_OLD_ACK;

			return -reason;