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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 */
/** */
/** Address Resolution Protocol (ARP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_packet.h"
#include "nx_arp.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_arp_packet_deferred_receive PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function receives an ARP packet from the link driver (usually */
/* the link driver's input ISR) and places it in the deferred receive */
/* ARP packet queue. This moves the minimal receive ARP packet */
/* processing from the ISR to the IP helper thread. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP control block */
/* packet_ptr Pointer to packet to send */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* tx_event_flags_set Wakeup IP helper thread */
/* _nx_packet_release Packet release function */
/* */
/* CALLED BY */
/* */
/* Application I/O Driver */
/* */
/**************************************************************************/
VOID _nx_arp_packet_deferred_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
/* Disable interrupts. */
TX_DISABLE
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Check to see if ARP is enabled on this IP instance. */
if (!ip_ptr -> nx_ip_arp_queue_process)
{
/* ARP is not enabled. */
#ifndef NX_DISABLE_ARP_INFO
/* Increment the ARP invalid messages count... */
ip_ptr -> nx_ip_arp_invalid_messages++;
#endif
/* Restore interrupts. */
TX_RESTORE
/* Since ARP is not enabled, just release the packet. */
_nx_packet_release(packet_ptr);
/* Return to caller. */
return;
}
/* Check to see if the ARP deferred processing queue is empty. */
if (ip_ptr -> nx_ip_arp_deferred_received_packet_head)
{
/* Not empty, just place the packet at the end of the ARP deferred queue. */
(ip_ptr -> nx_ip_arp_deferred_received_packet_tail) -> nx_packet_queue_next = packet_ptr;
packet_ptr -> nx_packet_queue_next = NX_NULL;
ip_ptr -> nx_ip_arp_deferred_received_packet_tail = packet_ptr;
/* Restore interrupts. */
TX_RESTORE
}
else
{
/* Empty ARP deferred receive processing queue. Just setup the head pointers and
set the event flags to ensure the IP helper thread looks at the ARP deferred
processing queue. */
ip_ptr -> nx_ip_arp_deferred_received_packet_head = packet_ptr;
ip_ptr -> nx_ip_arp_deferred_received_packet_tail = packet_ptr;
packet_ptr -> nx_packet_queue_next = NX_NULL;
/* Restore interrupts. */
TX_RESTORE
/* Wakeup IP helper thread to process the ARP deferred receive. */
tx_event_flags_set(&(ip_ptr -> nx_ip_events), NX_IP_ARP_REC_EVENT, TX_OR);
}
}
#endif /* !NX_DISABLE_IPV4 */
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