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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 */
/** */
/** Internet Protocol (IP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "tx_thread.h"
#include "nx_ip.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_ip_raw_packet_receive PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function retrieves the first packet from the received raw */
/* packet list and returns it to the caller. If no packet is present */
/* the routine may optionally suspend waiting on the list for a */
/* packet. */
/* */
/* INPUT */
/* */
/* ip_ptr IP control block pointer */
/* packet_ptr Pointer to return allocated */
/* packet */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_system_suspend Suspend thread */
/* */
/* 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_ip_raw_packet_receive(NX_IP *ip_ptr, NX_PACKET **packet_ptr, ULONG wait_option)
{
TX_INTERRUPT_SAVE_AREA
UINT status; /* Return status */
TX_THREAD *thread_ptr; /* Working thread pointer */
NX_PACKET *work_ptr; /* Working packet pointer */
#ifdef TX_ENABLE_EVENT_TRACE
TX_TRACE_BUFFER_ENTRY *trace_event;
ULONG trace_timestamp;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_IP_RAW_PACKET_RECEIVE, ip_ptr, 0, wait_option, 0, NX_TRACE_IP_EVENTS, &trace_event, &trace_timestamp);
/* Disable interrupts to get a packet from the pool. */
TX_DISABLE
/* Determine if there is an available packet. */
if (ip_ptr -> nx_ip_raw_received_packet_count)
{
/* Yes, a packet is available. Decrement the raw packet receive count. */
ip_ptr -> nx_ip_raw_received_packet_count--;
/* Pickup the first raw packet pointer. */
work_ptr = ip_ptr -> nx_ip_raw_received_packet_head;
/* Modify the available list to point at the next packet in the pool. */
ip_ptr -> nx_ip_raw_received_packet_head = work_ptr -> nx_packet_queue_next;
/* Determine if the tail pointer points to the same packet. */
if (ip_ptr -> nx_ip_raw_received_packet_tail == work_ptr)
{
/* Yes, just set tail pointer to NULL since we must be at the end of the queue. */
ip_ptr -> nx_ip_raw_received_packet_tail = NX_NULL;
}
/* Place the raw packet pointer in the return destination. */
*packet_ptr = work_ptr;
/* Update the trace event with the status. */
NX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, NX_TRACE_IP_RAW_PACKET_RECEIVE, 0, *packet_ptr, 0, 0);
/* Set status to success. */
status = NX_SUCCESS;
}
else
{
/* Determine if the request specifies suspension. */
if (wait_option)
{
/* Prepare for suspension of this thread. */
/* Pickup thread pointer. */
thread_ptr = _tx_thread_current_ptr;
/* Setup cleanup routine pointer. */
thread_ptr -> tx_thread_suspend_cleanup = _nx_ip_raw_packet_cleanup;
/* Setup cleanup information, i.e. this IP control
block. */
thread_ptr -> tx_thread_suspend_control_block = (void *)ip_ptr;
/* Save the return packet pointer address as well. */
thread_ptr -> tx_thread_additional_suspend_info = (void *)packet_ptr;
/* Setup suspension list. */
if (ip_ptr -> nx_ip_raw_packet_suspension_list)
{
/* This list is not NULL, add current thread to the end. */
thread_ptr -> tx_thread_suspended_next =
ip_ptr -> nx_ip_raw_packet_suspension_list;
thread_ptr -> tx_thread_suspended_previous =
(ip_ptr -> nx_ip_raw_packet_suspension_list) -> tx_thread_suspended_previous;
((ip_ptr -> nx_ip_raw_packet_suspension_list) -> tx_thread_suspended_previous) -> tx_thread_suspended_next = thread_ptr;
(ip_ptr -> nx_ip_raw_packet_suspension_list) -> tx_thread_suspended_previous = thread_ptr;
}
else
{
/* No other threads are suspended. Setup the head pointer and
just setup this threads pointers to itself. */
ip_ptr -> nx_ip_raw_packet_suspension_list = thread_ptr;
thread_ptr -> tx_thread_suspended_next = thread_ptr;
thread_ptr -> tx_thread_suspended_previous = thread_ptr;
}
/* Increment the suspended thread count. */
ip_ptr -> nx_ip_raw_packet_suspended_count++;
/* Set the state to suspended. */
thread_ptr -> tx_thread_state = TX_TCP_IP;
/* Set the suspending flag. */
thread_ptr -> tx_thread_suspending = TX_TRUE;
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Save the timeout value. */
thread_ptr -> tx_thread_timer.tx_timer_internal_remaining_ticks = wait_option;
/* Restore interrupts. */
TX_RESTORE
/* Call actual thread suspension routine. */
_tx_thread_system_suspend(thread_ptr);
/* Update the trace event with the status. */
NX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, NX_TRACE_IP_RAW_PACKET_RECEIVE, 0, *packet_ptr, 0, 0);
/* Return the completion status. */
return(thread_ptr -> tx_thread_suspend_status);
}
else
{
/* Immediate return, return error completion. */
status = NX_NO_PACKET;
}
}
/* Restore interrupts. */
TX_RESTORE
/* Return completion status. */
return(status);
}
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