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 /** Transmission Control Protocol (TCP) */ 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 #include "nx_packet.h" 31 #include "nx_tcp.h" 32 33 34 /**************************************************************************/ 35 /* */ 36 /* FUNCTION RELEASE */ 37 /* */ 38 /* _nx_tcp_socket_transmit_queue_flush PORTABLE C */ 39 /* 6.1 */ 40 /* AUTHOR */ 41 /* */ 42 /* Yuxin Zhou, Microsoft Corporation */ 43 /* */ 44 /* DESCRIPTION */ 45 /* */ 46 /* This function releases all packets in the specified socket's */ 47 /* transmit queue. */ 48 /* */ 49 /* INPUT */ 50 /* */ 51 /* socket_ptr Pointer to socket */ 52 /* */ 53 /* OUTPUT */ 54 /* */ 55 /* None */ 56 /* */ 57 /* CALLS */ 58 /* */ 59 /* _nx_packet_release Release a packet */ 60 /* */ 61 /* CALLED BY */ 62 /* */ 63 /* _nx_tcp_socket_connection_reset Socket connection reset */ 64 /* processing */ 65 /* _nx_tcp_socket_disconnect Socket disconnect processing */ 66 /* */ 67 /* RELEASE HISTORY */ 68 /* */ 69 /* DATE NAME DESCRIPTION */ 70 /* */ 71 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 72 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 73 /* resulting in version 6.1 */ 74 /* */ 75 /**************************************************************************/ _nx_tcp_socket_transmit_queue_flush(NX_TCP_SOCKET * socket_ptr)76VOID _nx_tcp_socket_transmit_queue_flush(NX_TCP_SOCKET *socket_ptr) 77 { 78 79 TX_INTERRUPT_SAVE_AREA 80 81 NX_PACKET *packet_ptr; 82 NX_PACKET *next_packet_ptr; 83 84 85 /* Setup packet pointer. */ 86 packet_ptr = socket_ptr -> nx_tcp_socket_transmit_sent_head; 87 88 /* Clear the head and the tail pointers. */ 89 socket_ptr -> nx_tcp_socket_transmit_sent_head = NX_NULL; 90 socket_ptr -> nx_tcp_socket_transmit_sent_tail = NX_NULL; 91 92 /* Loop to clear all the packets out. */ 93 while (socket_ptr -> nx_tcp_socket_transmit_sent_count) 94 { 95 96 /* Disable interrupts. */ 97 TX_DISABLE 98 99 /* Pickup the next queued packet. */ 100 next_packet_ptr = packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next; 101 102 /* Mark the packet as no longer being in a TCP queue. */ 103 /*lint -e{923} suppress cast of ULONG to pointer. */ 104 packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ALLOCATED; 105 106 /* Has the packet been transmitted? */ 107 /*lint -e{923} suppress cast of ULONG to pointer. */ 108 if (packet_ptr -> nx_packet_queue_next == ((NX_PACKET *)NX_DRIVER_TX_DONE)) 109 { 110 111 /* Yes, the driver has already released the packet. */ 112 113 /* Restore interrupts. */ 114 TX_RESTORE 115 116 /* Release the packet. */ 117 _nx_packet_release(packet_ptr); 118 } 119 else 120 { 121 122 /* Just restore interrupts. */ 123 TX_RESTORE 124 } 125 126 /* Move to the next packet. */ 127 packet_ptr = next_packet_ptr; 128 129 /* Decrease the queued packet count. */ 130 socket_ptr -> nx_tcp_socket_transmit_sent_count--; 131 } 132 } 133 134
