# Copyright (c) 2020 Freie Universitaet Berlin
#
# This file is subject to the terms and conditions of the GNU Lesser
# General Public License v2.1. See the file LICENSE in the top level
# directory for more details.
#
menuconfig KCONFIG_MODULE_GNRC_TCP
    bool "Configure GNRC_TCP"
    depends on MODULE_GNRC_TCP
    help
        Configure the GNRC_TCP using Kconfig.

if KCONFIG_MODULE_GNRC_TCP

config GNRC_TCP_CONNECTION_TIMEOUT_DURATION
    int "Timeout duration for user calls in microseconds"
    default 120000000
    help
        Timeout duration for user calls. Default value is 120000000 microseconds
        (2 minutes).

config GNRC_TCP_MSL
    int "Maximum segment lifetime (MSL) in microseconds"
    default 30000000
    help
        Maximum segment lifetime (MSL) in microseconds. Default value is 30
        seconds.

config GNRC_TCP_MSS
    int "Maximum Segment Size (MSS)"
    default 1220 if MODULE_GNRC_IPV6
    default 576

config GNRC_TCP_MSS_MULTIPLICATOR
    int "Number of MSS sized packets stored in receive buffer"
    default 1
    help
        Configure MSS Multiplicator i.e. number of MSS sized packets stored in
        receive buffer.

config GNRC_TCP_DEFAULT_WINDOW_EN
    bool "Enable configuration of TCP window size"
    help
        Enable configuration of TCP window size. If not enabled, TCP window size
        will default to the product of Maximum Segment Size and the number of
        MSS sized packets i.e. CONFIG_GNRC_TCP_MSS *
        CONFIG_GNRC_TCP_MSS_MULTIPLICATOR.

config GNRC_TCP_DEFAULT_WINDOW
    int "TCP receive window size"
    default 1220 if MODULE_GNRC_IPV6
    default 576
    depends on GNRC_TCP_DEFAULT_WINDOW_EN
    help
        Configure TCP receive window size. This value determines the maximum
        amount of bytes that can be received from the peer at a given moment.

config GNRC_TCP_RCV_BUFFERS
    int "Number of preallocated receive buffers"
    default 1

config GNRC_TCP_RTO_LOWER_BOUND
    int "Lower bound for RTO in microseconds"
    default 1000000
    help
        Lower bound value for retransmission timeout (RTO) in microseconds.
        Default value is 1000000 microseconds (1 second). Retransmission
        timeout determines how long TCP waits for acknowledgment (ACK) of
        transmitted segment. Refer to RFC 6298 for more information.

config GNRC_TCP_RTO_UPPER_BOUND
    int "Upper bound for RTO in microseconds"
    default 60000000
    help
        Upper bound value for retransmission timeout (RTO) in microseconds.
        Default value is 60000000 microseconds (60 seconds). Refer to RFC 6298
        for more information.

config GNRC_TCP_RTO_GRANULARITY
    int "Clock granularity for RTO in microseconds"
    default 10000
    help
        Clock granularity for retransmission timeout (RTO) for TCP in
        microseconds. Default value is 10000 microseconds (10 milliseconds).
        Refer to RFC 6298 for more information.

config GNRC_TCP_RTO_A_DIV
    int "Alpha value divisor for RTO calculation"
    default 8
    help
        Alpha value divisor to calculate retransmission timeout (RTO). The
        default value for divisor is 8 which would result in an alpha value of
        1/8.

config GNRC_TCP_RTO_B_DIV
    int "Beta value divisor for RTO calculation"
    default 4
    help
        Beta value divisor to calculate retransmission timeout (RTO). The
        default value for divisor is 4 which would result in a beta value of
        1/4.

config GNRC_TCP_RTO_K
    int "K value for RTO calculation"
    default 4

config GNRC_TCP_PROBE_LOWER_BOUND
    int "Lower bound for the duration between probes in microseconds"
    default 1000000

config GNRC_TCP_PROBE_UPPER_BOUND
    int "Lower bound for the duration between probes in microseconds"
    default 60000000

config GNRC_TCP_MSG_QUEUE_SIZE_SIZE_EXP
    int "Message queue size for TCP API internal messaging (as exponent of 2^n)"
    default 2
    help
        The number of elements in a message queue must be always a power of two.
        This value defines the exponent of 2^n.

config GNRC_TCP_EVENTLOOP_MSG_QUEUE_SIZE_SIZE_EXP
    int "Message queue size for the TCP eventloop (as exponent of 2^n)"
    default 3
    help
        The number of elements in a message queue must be always a power of two.
        This value defines the exponent of 2^n.

endif # KCONFIG_MODULE_GNRC_TCP