netdev - Re: [PATCH net-next v6 06/11] tcp: introduce dropreasons in receive path

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Date: Sun, 18 Feb 2024 20:47:44 -0800
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <kerneljasonxing@...il.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kernelxing@...cent.com>, <kuba@...nel.org>, <kuniyu@...zon.com>,
	<netdev@...r.kernel.org>, <pabeni@...hat.com>
Subject: Re: [PATCH net-next v6 06/11] tcp: introduce dropreasons in receive path

From: Jason Xing <kerneljasonxing@...il.com>
Date: Mon, 19 Feb 2024 11:28:33 +0800
> From: Jason Xing <kernelxing@...cent.com>
> 
> Soon later patches can use these relatively more accurate
> reasons to recognise and find out the cause.
> 
> Signed-off-by: Jason Xing <kernelxing@...cent.com>
> --
> v5:
> Link: https://lore.kernel.org/netdev/3a495358-4c47-4a9f-b116-5f9c8b44e5ab@kernel.org/
> 1. Use new name (TCP_ABORT_ON_DATA) for readability (David)
> 2. change the title of this patch
> ---
>  include/net/dropreason-core.h | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
> index 3c867384dead..402367bfa56f 100644
> --- a/include/net/dropreason-core.h
> +++ b/include/net/dropreason-core.h
> @@ -30,6 +30,7 @@
>  	FN(TCP_AOFAILURE)		\
>  	FN(SOCKET_BACKLOG)		\
>  	FN(TCP_FLAGS)			\
> +	FN(TCP_ABORT_ON_DATA)	\
>  	FN(TCP_ZEROWINDOW)		\
>  	FN(TCP_OLD_DATA)		\
>  	FN(TCP_OVERWINDOW)		\
> @@ -37,6 +38,7 @@
>  	FN(TCP_RFC7323_PAWS)		\
>  	FN(TCP_OLD_SEQUENCE)		\
>  	FN(TCP_INVALID_SEQUENCE)	\
> +	FN(TCP_INVALID_ACK_SEQUENCE)	\
>  	FN(TCP_RESET)			\
>  	FN(TCP_INVALID_SYN)		\
>  	FN(TCP_CLOSE)			\
> @@ -204,6 +206,11 @@ enum skb_drop_reason {
>  	SKB_DROP_REASON_SOCKET_BACKLOG,
>  	/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
>  	SKB_DROP_REASON_TCP_FLAGS,
> +	/**
> +	 * @SKB_DROP_REASON_TCP_ABORT_ON_DATA: abort on data, corresponding to
> +	 * LINUX_MIB_TCPABORTONDATA
> +	 */
> +	SKB_DROP_REASON_TCP_ABORT_ON_DATA,
>  	/**
>  	 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
>  	 * see LINUX_MIB_TCPZEROWINDOWDROP
> @@ -228,13 +235,19 @@ enum skb_drop_reason {
>  	SKB_DROP_REASON_TCP_OFOMERGE,
>  	/**
>  	 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
> -	 * LINUX_MIB_PAWSESTABREJECTED
> +	 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
>  	 */
>  	SKB_DROP_REASON_TCP_RFC7323_PAWS,
>  	/** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
>  	SKB_DROP_REASON_TCP_OLD_SEQUENCE,
>  	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
>  	SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
> +	/**
> +	 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
> +	 * field. because of ack sequence is not in the window between snd_una

nit: s/. because of/ because/


> +	 * and snd_nxt
> +	 */
> +	SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
>  	/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
>  	SKB_DROP_REASON_TCP_RESET,
>  	/**
> -- 
> 2.37.3
>