netdev - [RFC PATCH 28/28] tcp: AccECN sysctl documentation

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Message-Id: <1584524612-24470-29-git-send-email-ilpo.jarvinen@helsinki.fi>
Date:   Wed, 18 Mar 2020 11:43:32 +0200
From:   Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
To:     netdev@...r.kernel.org
Cc:     Yuchung Cheng <ycheng@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Olivier Tilmans <olivier.tilmans@...ia-bell-labs.com>
Subject: [RFC PATCH 28/28] tcp: AccECN sysctl documentation

From: Ilpo Järvinen <ilpo.jarvinen@...helsinki.fi>

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...helsinki.fi>
---
 Documentation/networking/ip-sysctl.txt | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 5f53faff4e25..ecca6e1d6bea 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -301,15 +301,21 @@ tcp_ecn - INTEGER
 		0 Disable ECN.  Neither initiate nor accept ECN.
 		1 Enable ECN when requested by incoming connections and
 		  also request ECN on outgoing connection attempts.
-		2 Enable ECN when requested by incoming connections
+		2 Enable ECN or AccECN when requested by incoming connections
 		  but do not request ECN on outgoing connections.
+		3 Enable AccECN when requested by incoming connections and
+		  also request AccECN on outgoing connection attempts.
+	    0x102 Enable AccECN in optionless mode for incoming connections.
+	    0x103 Enable AccECN in optionless mode for incoming and outgoing
+		  connections.
 	Default: 2
 
 tcp_ecn_fallback - BOOLEAN
 	If the kernel detects that ECN connection misbehaves, enable fall
 	back to non-ECN. Currently, this knob implements the fallback
-	from RFC3168, section 6.1.1.1., but we reserve that in future,
-	additional detection mechanisms could be implemented under this
+	from RFC3168, section 6.1.1.1., as well as the ECT codepoint mangling
+	detection during the Accurate ECN handshake, but we reserve that in
+	future, additional detection mechanisms could be implemented under this
 	knob. The value	is not used, if tcp_ecn or per route (or congestion
 	control) ECN settings are disabled.
 	Default: 1 (fallback enabled)
-- 
2.20.1