netdev - Re: [PATCH v5 net-next 11/15] tcp: accecn: AccECN option failure handling

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Message-ID: <eed29236-f238-46c2-a60d-fbdd3955dc99@redhat.com>
Date: Tue, 29 Apr 2025 16:08:08 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: chia-yu.chang@...ia-bell-labs.com, horms@...nel.org, dsahern@...nel.org,
 kuniyu@...zon.com, bpf@...r.kernel.org, netdev@...r.kernel.org,
 dave.taht@...il.com, jhs@...atatu.com, kuba@...nel.org,
 stephen@...workplumber.org, xiyou.wangcong@...il.com, jiri@...nulli.us,
 davem@...emloft.net, edumazet@...gle.com, andrew+netdev@...n.ch,
 donald.hunter@...il.com, ast@...erby.net, liuhangbin@...il.com,
 shuah@...nel.org, linux-kselftest@...r.kernel.org, ij@...nel.org,
 ncardwell@...gle.com, koen.de_schepper@...ia-bell-labs.com,
 g.white@...lelabs.com, ingemar.s.johansson@...csson.com,
 mirja.kuehlewind@...csson.com, cheshire@...le.com, rs.ietf@....at,
 Jason_Livingood@...cast.com, vidhi_goel@...le.com
Subject: Re: [PATCH v5 net-next 11/15] tcp: accecn: AccECN option failure
 handling

On 4/22/25 5:35 PM, chia-yu.chang@...ia-bell-labs.com wrote:
> @@ -555,6 +556,30 @@ static void smc_check_reset_syn_req(const struct tcp_sock *oldtp,
>  #endif
>  }
>  
> +u8 tcp_accecn_option_init(const struct sk_buff *skb, u8 opt_offset)
> +{
> +	unsigned char *ptr = skb_transport_header(skb) + opt_offset;
> +	unsigned int optlen = ptr[1] - 2;
> +
> +	WARN_ON_ONCE(ptr[0] != TCPOPT_ACCECN0 && ptr[0] != TCPOPT_ACCECN1);

This warn shoul be dropped, too.

/P