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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
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