1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** NetX Component */ 17 /** */ 18 /** Internet Protocol (IP) */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define NX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "nx_api.h" 29 #include "nx_ip.h" 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _nx_ip_packet_deferred_receive PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Yuxin Zhou, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function receives a packet from the link driver (usually the */ 45 /* link driver's input ISR) and places it in the deferred receive */ 46 /* packet queue. This moves the minimal receive packet processing */ 47 /* from the ISR to the IP helper thread. */ 48 /* */ 49 /* INPUT */ 50 /* */ 51 /* ip_ptr Pointer to IP control block */ 52 /* packet_ptr Pointer to packet to send */ 53 /* */ 54 /* OUTPUT */ 55 /* */ 56 /* None */ 57 /* */ 58 /* CALLS */ 59 /* */ 60 /* tx_event_flags_set Set events for IP thread */ 61 /* */ 62 /* CALLED BY */ 63 /* */ 64 /* Application I/O Driver */ 65 /* */ 66 /* RELEASE HISTORY */ 67 /* */ 68 /* DATE NAME DESCRIPTION */ 69 /* */ 70 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 71 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 72 /* resulting in version 6.1 */ 73 /* */ 74 /**************************************************************************/ _nx_ip_packet_deferred_receive(NX_IP * ip_ptr,NX_PACKET * packet_ptr)75VOID _nx_ip_packet_deferred_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr) 76 { 77 78 TX_INTERRUPT_SAVE_AREA 79 80 81 /* Disable interrupts. */ 82 TX_DISABLE 83 84 /* Add debug information. */ 85 NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr); 86 87 /* Check to see if the deferred processing queue is empty. */ 88 if (ip_ptr -> nx_ip_deferred_received_packet_head) 89 { 90 91 /* Not empty, just place the packet at the end of the queue. */ 92 (ip_ptr -> nx_ip_deferred_received_packet_tail) -> nx_packet_queue_next = packet_ptr; 93 packet_ptr -> nx_packet_queue_next = NX_NULL; 94 ip_ptr -> nx_ip_deferred_received_packet_tail = packet_ptr; 95 96 /* Restore interrupts. */ 97 TX_RESTORE 98 } 99 else 100 { 101 102 /* Empty deferred receive processing queue. Just setup the head pointers and 103 set the event flags to ensure the IP helper thread looks at the deferred processing 104 queue. */ 105 ip_ptr -> nx_ip_deferred_received_packet_head = packet_ptr; 106 ip_ptr -> nx_ip_deferred_received_packet_tail = packet_ptr; 107 packet_ptr -> nx_packet_queue_next = NX_NULL; 108 109 /* Restore interrupts. */ 110 TX_RESTORE 111 112 /* Wakeup IP helper thread to process the IP deferred receive. */ 113 tx_event_flags_set(&(ip_ptr -> nx_ip_events), NX_IP_RECEIVE_EVENT, TX_OR); 114 } 115 } 116 117
