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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Packet Pool Management (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_packet.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_packet_transmit_release PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function releases a transmitted packet chain back to the */
/* appropriate packet pool. If the packet is a TCP packet, it is */
/* simply marked as completed. The actual release is deferred to */
/* the TCP component. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer of packet to release */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_release Release packet back to pool */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_packet_transmit_release(NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
UINT status;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_PACKET_TRANSMIT_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);
/* Disable interrupts temporarily. */
TX_DISABLE
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Determine if the packet is a queued TCP data packet. Such packets cannot be released
immediately, since they may need to be resent. */
/*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)) &&
(packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next != ((NX_PACKET *)NX_PACKET_FREE)))
{
/* Yes, this is indeed a TCP packet. Just mark this with the NX_DRIVER_TX_DONE
value to let the TCP layer know it is no longer queued up. */
/*lint -e{923} suppress cast of ULONG to pointer. */
packet_ptr -> nx_packet_queue_next = (NX_PACKET *)NX_DRIVER_TX_DONE;
/* Remove the IP header and adjust the length. */
packet_ptr -> nx_packet_prepend_ptr += packet_ptr -> nx_packet_ip_header_length;
packet_ptr -> nx_packet_length -= packet_ptr -> nx_packet_ip_header_length;
/* Reset the IP header length. */
packet_ptr -> nx_packet_ip_header_length = 0;
/* Restore interrupts. */
TX_RESTORE
/* Return success. */
status = NX_SUCCESS;
}
else
{
/* Restore interrupts. */
TX_RESTORE
/* Call the actual packet release function. */
status = _nx_packet_release(packet_ptr);
}
/* Return completion status. */
return(status);
}
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