Date: Sun, 18 Apr 2021 13:49:56 +0100 From: Jeremy Harris <jgh@wizmail.org> To: "transport@freebsd.org" <transport@freebsd.org> Subject: TCP Fast Open Message-ID: <7c17539a-b50f-bf52-b55b-5d9b1cc3caad@wizmail.org>
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Could I put in a request for better observability? That is, for
an application to be able to tell (for both client and server cases)
if TFO was not tried / requested successfully / used with no data /
used with data ?
There is partial observability currently, via sockopts TCP_FASTOPEN
and TCP_INFO... and they are unreliable.
[ I'll note here that Linux is no better ]
Also, a means for getting data on the SYN,ACK packet. Currently
AFAIK we cannot; we can send data from the server (under TFO) before
the ACK of the SYN,ACK but only as a separate packet.
The use case in mind is SMTP, which is a server-first protocol.
Whether or not the facility would have to restrict to preloaded data,
or could manage an application interaction, is up for argument.
--
Cheers,
Jeremy
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