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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_tcp.h"
#include "nx_ip.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_enable PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function enables the TCP management component for the */
/* specified IP instance. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_timer_create Create fast TCP timer */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_tcp_enable(NX_IP *ip_ptr)
{
UINT i;
struct NX_TCP_LISTEN_STRUCT *listen_ptr;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_TCP_ENABLE, ip_ptr, 0, 0, 0, NX_TRACE_TCP_EVENTS, 0, 0);
/* Place all server listen request structures on the available list. */
/* Setup a pointer to the first listen. */
listen_ptr = &(ip_ptr -> nx_ip_tcp_server_listen_reqs[0]);
/* Setup the available listen requests head pointer. */
ip_ptr -> nx_ip_tcp_available_listen_requests = listen_ptr;
/* Loop through the listen requests and link them on the available list. */
for (i = 0; i < NX_MAX_LISTEN_REQUESTS; i++)
{
/* Link listen request to next listen request. */
listen_ptr -> nx_tcp_listen_next = listen_ptr + 1;
/* Determine if we need to move to the next listen request. */
if (i < (NX_MAX_LISTEN_REQUESTS - 1))
{
listen_ptr++;
}
}
/* Make sure the last listen request has a NULL pointer. */
listen_ptr -> nx_tcp_listen_next = NX_NULL;
/* Set the TCP packet queue processing function. */
ip_ptr -> nx_ip_tcp_queue_process = _nx_tcp_queue_process;
/* Set the TCP periodic processing function. */
ip_ptr -> nx_ip_tcp_periodic_processing = _nx_tcp_periodic_processing;
/* Set the TCP fast periodic processing function. */
ip_ptr -> nx_ip_tcp_fast_periodic_processing = _nx_tcp_fast_periodic_processing;
/* Set the TCP deferred cleanup check function. */
ip_ptr -> nx_tcp_deferred_cleanup_check = _nx_tcp_deferred_cleanup_check;
/* Setup base timer variables. */
_nx_tcp_fast_timer_rate = (NX_IP_PERIODIC_RATE + (NX_TCP_FAST_TIMER_RATE - 1)) / NX_TCP_FAST_TIMER_RATE;
_nx_tcp_ack_timer_rate = (NX_IP_PERIODIC_RATE + (NX_TCP_ACK_TIMER_RATE - 1)) / NX_TCP_ACK_TIMER_RATE;
/*lint -e{778} suppress constant expression, since NX_TCP_TRANSMIT_TIMER_RATE can be redefined. */
/*lint -e{835} -e{845} suppress operating on zero. */
_nx_tcp_transmit_timer_rate = (NX_IP_PERIODIC_RATE + (NX_TCP_TRANSMIT_TIMER_RATE - 1)) / NX_TCP_TRANSMIT_TIMER_RATE;
_nx_tcp_2MSL_timer_rate = 2 * NX_IP_PERIODIC_RATE * NX_TCP_MAXIMUM_SEGMENT_LIFETIME;
_nx_ip_fast_periodic_timer_create(ip_ptr);
/* Set the TCP packet receive function in the IP structure to indicate
we are ready to receive TCP packets. */
ip_ptr -> nx_ip_tcp_packet_receive = _nx_tcp_packet_receive;
/* Return successful completion. */
return(NX_SUCCESS);
}