netdev - RE: [PATCH v9 net-next 13/15] tcp: accecn: add tcpi_ecn_mode and tcpi_option2 in tcp

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Message-ID:
 <PAXPR07MB798488DE2DD7C67F7DFDF550A389A@PAXPR07MB7984.eurprd07.prod.outlook.com>
Date: Tue, 20 Jan 2026 12:05:23 +0000
From: "Chia-Yu Chang (Nokia)" <chia-yu.chang@...ia-bell-labs.com>
To: Eric Dumazet <edumazet@...gle.com>
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Subject: RE: [PATCH v9 net-next 13/15] tcp: accecn: add tcpi_ecn_mode and
 tcpi_option2 in tcp_info

> -----Original Message-----
> From: Chia-Yu Chang (Nokia) 
> Sent: Tuesday, January 20, 2026 12:38 PM
> To: 'Eric Dumazet' <edumazet@...gle.com>
> Cc: pabeni@...hat.com; parav@...dia.com; linux-doc@...r.kernel.org; corbet@....net; horms@...nel.org; dsahern@...nel.org; kuniyu@...gle.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; 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 (Nokia) <koen.de_schepper@...ia-bell-labs.com>; g.white@...lelabs.com; ingemar.s.johansson@...csson.com; mirja.kuehlewind@...csson.com; cheshire <cheshire@...le.com>; rs.ietf@....at; Jason_Livingood@...cast.com; Vidhi Goel <vidhi_goel@...le.com>
> Subject: RE: [PATCH v9 net-next 13/15] tcp: accecn: add tcpi_ecn_mode and tcpi_option2 in tcp_info
> 
> > -----Original Message-----
> > From: Eric Dumazet <edumazet@...gle.com>
> > Sent: Tuesday, January 20, 2026 12:18 PM
> > To: Chia-Yu Chang (Nokia) <chia-yu.chang@...ia-bell-labs.com>
> > Cc: pabeni@...hat.com; parav@...dia.com; linux-doc@...r.kernel.org; 
> > corbet@....net; horms@...nel.org; dsahern@...nel.org; 
> > kuniyu@...gle.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; 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 (Nokia) 
> > <koen.de_schepper@...ia-bell-labs.com>; g.white@...lelabs.com; 
> > ingemar.s.johansson@...csson.com; mirja.kuehlewind@...csson.com; 
> > cheshire <cheshire@...le.com>; rs.ietf@....at; 
> > Jason_Livingood@...cast.com; Vidhi Goel <vidhi_goel@...le.com>
> > Subject: Re: [PATCH v9 net-next 13/15] tcp: accecn: add tcpi_ecn_mode 
> > and tcpi_option2 in tcp_info
> > 
> > 
> > CAUTION: This is an external email. Please be very careful when clicking links or opening attachments. See the URL nok.it/ext for additional information.
> > 
> > 
> > 
> > On Mon, Jan 19, 2026 at 7:59 PM <chia-yu.chang@...ia-bell-labs.com> wrote:
> > >
> > > From: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
> > >
> > > Add 2-bit tcpi_ecn_mode feild within tcp_info to indicate which ECN 
> > > mode is negotiated: ECN_MODE_DISABLED, ECN_MODE_RFC3168, 
> > > ECN_MODE_ACCECN, or ECN_MODE_PENDING. This is done by utilizing 
> > > available bits from tcpi_accecn_opt_seen (reduced from 16 bits to 2
> > > bits) and tcpi_accecn_fail_mode (reduced from 16 bits to 4 bits).
> > >
> > > Also, an extra 24-bit tcpi_options2 field is identified to represent 
> > > newer options and connection features, as all 8 bits of tcpi_options 
> > > field have been used.
> > >
> > > Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
> > > Co-developed-by: Neal Cardwell <ncardwell@...gle.com>
> > > Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> > 
> > Are you sure Neal Cardwell really is ok with this patch, saw it and gave his SOB ?

This was discussed in another thread with Neal: "[PATCH net-next 1/1] selftests/net: Add packetdrill packetdrill cases". And Neal/me discussed this change.
But it was my miss that not syncing live update of tcp_info in packetdrill.
So, I will fix in the next net-next, thanks.

Chia-Yu