netdev - RE: [PATCH v15 net-next 08/14] tcp: accecn: AccECN needs to know delivered bytes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:
 <PAXPR07MB79846C85BDC7CC6ED5112A6AA332A@PAXPR07MB7984.eurprd07.prod.outlook.com>
Date: Thu, 21 Aug 2025 14:33:34 +0000
From: "Chia-Yu Chang (Nokia)" <chia-yu.chang@...ia-bell-labs.com>
To: Eric Dumazet <edumazet@...gle.com>
CC: "pabeni@...hat.com" <pabeni@...hat.com>, "linux-doc@...r.kernel.org"
	<linux-doc@...r.kernel.org>, "corbet@....net" <corbet@....net>,
	"horms@...nel.org" <horms@...nel.org>, "dsahern@...nel.org"
	<dsahern@...nel.org>, "kuniyu@...zon.com" <kuniyu@...zon.com>,
	"bpf@...r.kernel.org" <bpf@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "dave.taht@...il.com" <dave.taht@...il.com>,
	"jhs@...atatu.com" <jhs@...atatu.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	"xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>, "jiri@...nulli.us"
	<jiri@...nulli.us>, "davem@...emloft.net" <davem@...emloft.net>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "donald.hunter@...il.com"
	<donald.hunter@...il.com>, "ast@...erby.net" <ast@...erby.net>,
	"liuhangbin@...il.com" <liuhangbin@...il.com>, "shuah@...nel.org"
	<shuah@...nel.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "ij@...nel.org" <ij@...nel.org>,
	"ncardwell@...gle.com" <ncardwell@...gle.com>, "Koen De Schepper (Nokia)"
	<koen.de_schepper@...ia-bell-labs.com>, "g.white@...lelabs.com"
	<g.white@...lelabs.com>, "ingemar.s.johansson@...csson.com"
	<ingemar.s.johansson@...csson.com>, "mirja.kuehlewind@...csson.com"
	<mirja.kuehlewind@...csson.com>, "cheshire@...le.com" <cheshire@...le.com>,
	"rs.ietf@....at" <rs.ietf@....at>, "Jason_Livingood@...cast.com"
	<Jason_Livingood@...cast.com>, "vidhi_goel@...le.com" <vidhi_goel@...le.com>
Subject: RE: [PATCH v15 net-next 08/14] tcp: accecn: AccECN needs to know
 delivered bytes

> -----Original Message-----
> From: Eric Dumazet <edumazet@...gle.com> 
> Sent: Thursday, August 21, 2025 2:24 PM
> To: Chia-Yu Chang (Nokia) <chia-yu.chang@...ia-bell-labs.com>
> Cc: pabeni@...hat.com; linux-doc@...r.kernel.org; corbet@....net; 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; 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@...le.com; rs.ietf@....at; Jason_Livingood@...cast.com; vidhi_goel@...le.com
> Subject: Re: [PATCH v15 net-next 08/14] tcp: accecn: AccECN needs to know delivered bytes
> 
> 
> 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 Fri, Aug 15, 2025 at 1:39 AM <chia-yu.chang@...ia-bell-labs.com> wrote:
> >
> > From: Ilpo Järvinen <ij@...nel.org>
> >
> > AccECN byte counter estimation requires delivered bytes which can be 
> > calculated while processing SACK blocks and cumulative ACK. The 
> > delivered bytes will be used to estimate the byte counters between 
> > AccECN option (on ACKs w/o the option).
> >
> > Non-SACK calculation is quite annoying, inaccurate, and likely bogus.
> 
> Does it mean AccECN depends on SACK ?
> 

In fact, AccECN does not depend on SACK to function; however, it would be more accurate if SACK were there.
In order to avoid confusion, I will remove this old comment in the next version.

Chia-Yu