netdev - TCP fast open using experimental TCP option?

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Date:   Tue, 25 Apr 2017 12:08:47 -0700
From:   Tom Herbert <tom@...bertland.com>
To:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jerry Chu <hkchu@...gle.com>
Subject: TCP fast open using experimental TCP option?

Looks like TCP fast open was using experimental TCP option at some. Is
this still needed? Technically this violates usage requirements of
experimental options. Can this be removed now since there is now an
assigned option number for TFO?

                             case TCPOPT_EXP:
                                /* Fast Open option shares code 254 using a
                                 * 16 bits magic number.
                                 */
                                if (opsize >= TCPOLEN_EXP_FASTOPEN_BASE &&
                                    get_unaligned_be16(ptr) ==
                                    TCPOPT_FASTOPEN_MAGIC)
                                        tcp_parse_fastopen_option(opsize -
                                                TCPOLEN_EXP_FASTOPEN_BASE,
                                                ptr + 2, th->syn, foc, true);
                                break;