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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 */
/** */
/** Packet Pool Management (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "tx_thread.h"
#include "nx_packet.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_packet_release PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function releases the packet chain back to the appropriate */
/* packet pools. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer of packet to release */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_system_resume Resume suspended 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_packet_release(NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
NX_PACKET_POOL *pool_ptr; /* Pool pointer */
TX_THREAD *thread_ptr; /* Working thread pointer */
#ifndef NX_DISABLE_PACKET_CHAIN
NX_PACKET *next_packet; /* Working block pointer */
#endif /* NX_DISABLE_PACKET_CHAIN */
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_PACKET_RELEASE, packet_ptr, packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next, (packet_ptr -> nx_packet_pool_owner) -> nx_packet_pool_available, 0, NX_TRACE_PACKET_EVENTS, 0, 0);
#ifndef NX_DISABLE_PACKET_CHAIN
/* Loop to free all packets chained together, not assuming they are
from the same pool. */
while (packet_ptr)
{
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Check to see if the packet is releasable. */
/*lint -e{923} suppress cast of ULONG to pointer. */
if (packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next != ((NX_PACKET *)NX_PACKET_ALLOCATED))
{
#ifndef NX_DISABLE_PACKET_INFO
/* Pickup the pool pointer. */
pool_ptr = packet_ptr -> nx_packet_pool_owner;
/* Check for a good pool pointer... error must be the packet! */
if ((pool_ptr) && (pool_ptr -> nx_packet_pool_id == NX_PACKET_POOL_ID))
{
/* Increment the packet pool invalid release error count. */
pool_ptr -> nx_packet_pool_invalid_releases++;
}
#endif
/* Return an error indicating the packet could not be released. */
return(NX_PTR_ERROR);
}
/* End of packet check. */
#ifndef NX_DISABLE_PACKET_CHAIN
/* Pickup the next packet. */
next_packet = packet_ptr -> nx_packet_next;
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Disable interrupts to put this packet back in the packet pool. */
TX_DISABLE
/* Pickup the pool pointer. */
pool_ptr = packet_ptr -> nx_packet_pool_owner;
/* Determine if there are any threads suspended on the block pool. */
thread_ptr = pool_ptr -> nx_packet_pool_suspension_list;
if (thread_ptr)
{
/* Remove the suspended thread from the list. */
/* See if this is the only suspended thread on the list. */
if (thread_ptr == thread_ptr -> tx_thread_suspended_next)
{
/* Yes, the only suspended thread. */
/* Update the head pointer. */
pool_ptr -> nx_packet_pool_suspension_list = NX_NULL;
}
else
{
/* At least one more thread is on the same expiration list. */
/* Update the list head pointer. */
pool_ptr -> nx_packet_pool_suspension_list = thread_ptr -> tx_thread_suspended_next;
/* Update the links of the adjacent threads. */
(thread_ptr -> tx_thread_suspended_next) -> tx_thread_suspended_previous =
thread_ptr -> tx_thread_suspended_previous;
(thread_ptr -> tx_thread_suspended_previous) -> tx_thread_suspended_next =
thread_ptr -> tx_thread_suspended_next;
}
/* Decrement the suspension count. */
pool_ptr -> nx_packet_pool_suspended_count--;
/* Prepare for resumption of the first thread. */
/* Clear cleanup routine to avoid timeout. */
thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Adjust this packet to look just like a new packet. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
#ifndef NX_DISABLE_PACKET_CHAIN
packet_ptr -> nx_packet_next = NX_NULL;
packet_ptr -> nx_packet_last = NX_NULL;
#endif /* NX_DISABLE_PACKET_CHAIN */
packet_ptr -> nx_packet_length = 0;
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_data_start + (thread_ptr -> tx_thread_suspend_info);
packet_ptr -> nx_packet_append_ptr = packet_ptr -> nx_packet_prepend_ptr;
packet_ptr -> nx_packet_address.nx_packet_interface_ptr = NX_NULL;
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
packet_ptr -> nx_packet_interface_capability_flag = 0;
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
/* Set the TCP queue to the value that indicates it has been allocated. */
/*lint -e{923} suppress cast of ULONG to pointer. */
packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ALLOCATED;
#ifdef FEATURE_NX_IPV6
/* Clear the option state. */
packet_ptr -> nx_packet_option_state = 0;
#endif /* FEATURE_NX_IPV6 */
#ifdef NX_IPSEC_ENABLE
/* Clear the ipsec state. */
packet_ptr -> nx_packet_ipsec_state = 0;
#endif /* NX_IPSEC_ENABLE */
/* Clear the IP version. */
packet_ptr -> nx_packet_ip_version = 0;
/* Clear the IP identification flag. */
packet_ptr -> nx_packet_identical_copy = NX_FALSE;
/* Initialize the IP header length. */
packet_ptr -> nx_packet_ip_header_length = 0;
/* Return this block pointer to the suspended thread waiting for
a block. */
*((NX_PACKET **)thread_ptr -> tx_thread_additional_suspend_info) = packet_ptr;
/* Put return status into the thread control block. */
thread_ptr -> tx_thread_suspend_status = NX_SUCCESS;
/* Resume thread. */
_tx_thread_system_resume(thread_ptr);
}
else
{
/* No thread is suspended for a memory block. */
/* Mark the packet as free. */
/*lint -e{923} suppress cast of ULONG to pointer. */
packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_FREE;
/* Put the packet back in the available list. */
packet_ptr -> nx_packet_queue_next = pool_ptr -> nx_packet_pool_available_list;
/* Adjust the head pointer. */
pool_ptr -> nx_packet_pool_available_list = packet_ptr;
/* Increment the count of available blocks. */
pool_ptr -> nx_packet_pool_available++;
/* Restore interrupts. */
TX_RESTORE
}
#ifndef NX_DISABLE_PACKET_CHAIN
/* Move to the next packet in the list. */
packet_ptr = next_packet;
}
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Return completion status. */
return(NX_SUCCESS);
}