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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. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** USBX Network Driver for NETX 5.3 and above. */
/** */
/**************************************************************************/
/**************************************************************************/
#include "tx_api.h"
#include "tx_thread.h"
#include "nx_api.h"
#include "ux_api.h"
#include "ux_network_driver.h"
static UINT usb_network_driver_initialized;
static USB_NETWORK_DEVICE_TYPE usb_network_devices[USB_NETWORK_DEVICE_MAX_INSTANCES];
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_init PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called by the application to initialize the */
/* USBX portion of the network driver. */
/* */
/* INPUT */
/* */
/* */
/* OUTPUT */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* verified memset and memcpy */
/* cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_network_driver_init(VOID)
{
UINT status = NX_SUCCESS;
/* Check if driver is already initialized. */
if (usb_network_driver_initialized == 0)
{
/* Driver is not initialized yet. */
usb_network_driver_initialized = 1;
/* Reset the network device memory array. */
_ux_utility_memory_set(&usb_network_devices[0], 0, sizeof(usb_network_devices)); /* Use case of memset is verified. */
}
return(status);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_activate PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* The USB network driver activate function is called as the USB instance */
/* is created. This API takes a pointer to the instance, and returns a */
/* ux_network_handle back to instance. Every time the instance receives */
/* a network packet, it should call ux_network_driver_packet_received with*/
/* ux_network_handle. */
/* */
/* INPUT */
/* */
/* ux_instance Instance of the USBX network class */
/* ux_network_device_write_function Address of the function to write a */
/* packet when sent by the application */
/* ux_network_handle Address where to store the network */
/* handle */
/* */
/* physical_address_msw Most significant word of network ad */
/* */
/* physical_address_lsw Least significant word of network ad */
/* */
/* */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* used UX prefix to refer to */
/* TX symbols instead of using */
/* them directly, */
/* resulting in version 6.1 */
/* 08-02-2021 Wen Wang Modified comment(s), */
/* fixed spelling error, */
/* resulting in version 6.1.8 */
/* */
/**************************************************************************/
UINT _ux_network_driver_activate(VOID *ux_instance, UINT(*ux_network_device_write_function)(VOID *, NX_PACKET *),
VOID **ux_network_handle, ULONG physical_address_msw, ULONG physical_address_lsw)
{
UX_INTERRUPT_SAVE_AREA
UINT i;
/* Critical section. */
UX_DISABLE
/* Find an available entry in the usb_network_devices table. */
for (i = 0; i < USB_NETWORK_DEVICE_MAX_INSTANCES; i++)
{
/* If the ptr to instance is NULL, we have a free entry. */
if (usb_network_devices[i].ux_network_device_usb_instance_ptr == NX_NULL)
{
/* Add the instance of the USBX class driver to the network device. */
usb_network_devices[i].ux_network_device_usb_instance_ptr = ux_instance;
break;
}
}
/* Unprotect the critical section. */
UX_RESTORE
/* Did we reach the max number of instance ? */
if (i == USB_NETWORK_DEVICE_MAX_INSTANCES)
{
/* Report error to application. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT);
/* Return error. */
return(USB_NETWORK_DRIVER_FAILURE);
}
/* Store the write function. */
usb_network_devices[i].ux_network_device_write_function = ux_network_device_write_function;
/* Store the physical address of the network interface. */
usb_network_devices[i].ux_network_physical_address_msw = physical_address_msw;
usb_network_devices[i].ux_network_physical_address_lsw = physical_address_lsw;
/* Are we not under interrupt? */
if (TX_THREAD_GET_SYSTEM_STATE() == 0)
{
/* Note that we were activated by a thread. */
usb_network_devices[i].ux_network_device_activated_by_thread = UX_TRUE;
/* Create deactivation sync objects. */
_ux_utility_mutex_create(&usb_network_devices[i].ux_network_device_deactivate_mutex, "usb network device mutex");
_ux_utility_semaphore_create(&usb_network_devices[i].ux_network_device_deactivate_semaphore, "usb network device semaphore", 0);
}
/* Is there an interface at the NETX level ? */
if (usb_network_devices[i].ux_network_device_interface_ptr)
{
/* Store the physical address at the NETX level. */
usb_network_devices[i].ux_network_device_interface_ptr -> nx_interface_physical_address_msw = physical_address_msw;
usb_network_devices[i].ux_network_device_interface_ptr -> nx_interface_physical_address_lsw = physical_address_lsw;
/* Is the link UP ? */
if (usb_network_devices[i].ux_network_device_interface_ptr -> nx_interface_link_up == NX_TRUE)
/* Yes, store its state. */
usb_network_devices[i].ux_network_device_link_status = NX_TRUE;
}
else
/* Link not yet up. */
usb_network_devices[i].ux_network_device_link_status = NX_FALSE;
/* Is there a network handle associated ? */
if (ux_network_handle)
/* Yes, the application wants to know its address. */
*ux_network_handle = (VOID*)&usb_network_devices[i];
/* The operation was successful. */
return(USB_NETWORK_DRIVER_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_deactivate PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* The USB network driver activate function is called as the USB instance */
/* is created. This API takes a pointer to the instance, and returns a */
/* ux_network_handle back to instance. Every time the instance receives */
/* a network packet, it should call ux_network_driver_packet_received with*/
/* ux_network_handle. */
/* */
/* INPUT */
/* */
/* ux_instance Instance of the USBX network class */
/* ux_network_device_write_function Address of the function to write a */
/* packet when sent by the application */
/* ux_network_handle Address where to store the network */
/* handle */
/* */
/* physical_address_msw Most significant word of network ad */
/* */
/* physical_address_lsw Least significant word of network ad */
/* */
/* */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* used UX prefix to refer to */
/* TX symbols instead of using */
/* them directly, */
/* resulting in version 6.1 */
/* 08-02-2021 Wen Wang Modified comment(s), */
/* fixed spelling error, */
/* resulting in version 6.1.8 */
/* */
/**************************************************************************/
UINT _ux_network_driver_deactivate(VOID *ux_instance, VOID *ux_network_handle)
{
UX_INTERRUPT_SAVE_AREA
USB_NETWORK_DEVICE_TYPE *usb_network_device;
UX_PARAMETER_NOT_USED(ux_instance);
/* Check if the handle exists. */
if(ux_network_handle == NX_NULL)
return(USB_NETWORK_DRIVER_FAILURE);
/* Cast the network handle properly. */
usb_network_device = (USB_NETWORK_DEVICE_TYPE*) ux_network_handle;
/* Critical section. */
UX_DISABLE
/* The link is down. */
_ux_network_driver_link_down(ux_network_handle);
/* Unprotect the critical section. */
UX_RESTORE
/* Are the sync objects valid? */
if (usb_network_device -> ux_network_device_activated_by_thread)
{
/* Get mutex. */
_ux_utility_mutex_on(&usb_network_device -> ux_network_device_deactivate_mutex);
/* Any threads in instance? */
if (usb_network_device -> ux_network_device_num_threads_inside != 0)
{
/* Signal that we're waiting. */
usb_network_device -> ux_network_device_deactivate_thread_waiting = UX_TRUE;
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device -> ux_network_device_deactivate_mutex);
/* Wait for last thread inside to resume us. */
_ux_utility_semaphore_get(&usb_network_device -> ux_network_device_deactivate_semaphore, UX_WAIT_FOREVER);
/* We're done waiting. */
usb_network_device -> ux_network_device_deactivate_thread_waiting = UX_FALSE;
}
else
{
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device -> ux_network_device_deactivate_mutex);
}
/* Delete sync objects. */
_ux_utility_mutex_delete(&usb_network_device -> ux_network_device_deactivate_mutex);
_ux_utility_semaphore_delete(&usb_network_device -> ux_network_device_deactivate_semaphore);
/* Reset for next activation. */
usb_network_device -> ux_network_device_activated_by_thread = UX_FALSE;
}
/* All threads are outside of the instance, and can't re-enter because the
link flag has been set to down. Now we can clean up. */
/* Reset the instance pointer. */
usb_network_device -> ux_network_device_usb_instance_ptr = NX_NULL;
/* And the write function ptr. */
usb_network_device -> ux_network_device_write_function = NX_NULL;
/* The operation was successful. */
return(USB_NETWORK_DRIVER_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_entry PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called by NETX. This is the dispatcher to all the */
/* NETX function to the driver layer. */
/* */
/* INPUT */
/* */
/* nx_ip_driver Pointer to the NX_IP driver instance */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* NETX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* used UX prefix to refer to */
/* TX symbols instead of using */
/* them directly, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _ux_network_driver_entry(NX_IP_DRIVER *nx_ip_driver)
{
UX_INTERRUPT_SAVE_AREA
NX_IP *nx_ip;
NX_PACKET *packet_ptr;
ULONG *ethernet_frame_ptr;
NX_INTERFACE *nx_interface_ptr;
USB_NETWORK_DEVICE_TYPE *usb_network_device_ptr;
UINT i;
/* Get the pointer to the NX_IP instance. */
nx_ip = nx_ip_driver -> nx_ip_driver_ptr;
/* Set the default status return. */
nx_ip_driver -> nx_ip_driver_status = NX_NOT_SUCCESSFUL;
/* Get the pointer to the interface in local variable. */
nx_interface_ptr = nx_ip_driver -> nx_ip_driver_interface;
/* Is this the ATTACH command? */
if (nx_ip_driver -> nx_ip_driver_command == NX_LINK_INTERFACE_ATTACH)
{
/* Critical section. */
UX_DISABLE
/* Find an available entry in the usb_network_devices table. */
for (i = 0; i < USB_NETWORK_DEVICE_MAX_INSTANCES; i++)
{
/* If the interface pointer is NULL, it is free. */
if (usb_network_devices[i].ux_network_device_interface_ptr == NX_NULL)
break;
}
/* Check if we have ran out of instances. */
if (i == USB_NETWORK_DEVICE_MAX_INSTANCES)
/* No more instances, set the error code. */
nx_ip_driver -> nx_ip_driver_status = NX_NO_MORE_ENTRIES;
else
{
/* Save the IP address in the network instance. */
usb_network_devices[i].ux_network_device_ip_instance = nx_ip;
/* Save pointer to interface. */
usb_network_devices[i].ux_network_device_interface_ptr = nx_interface_ptr;
/* Set the USB class instance in the additional link. This will be used by the USB class driver. */
nx_interface_ptr -> nx_interface_additional_link_info = (VOID *) &usb_network_devices[i];
/* The operation was successful. */
nx_ip_driver -> nx_ip_driver_status = NX_SUCCESS;
}
/* Unprotect the critical section. */
UX_RESTORE
}
else
{
/* Get the usb instance. */
usb_network_device_ptr = (USB_NETWORK_DEVICE_TYPE *) nx_interface_ptr -> nx_interface_additional_link_info;
/* Identify command. */
switch(nx_ip_driver -> nx_ip_driver_command)
{
case NX_LINK_INITIALIZE:
/* INIT command, set the interface parameters. */
nx_interface_ptr -> nx_interface_valid = NX_TRUE;
nx_interface_ptr -> nx_interface_address_mapping_needed = NX_TRUE;
nx_interface_ptr -> nx_interface_ip_mtu_size = NX_ETHERNET_MTU - NX_ETHERNET_SIZE;
/* Set the link to down for now. */
nx_interface_ptr -> nx_interface_link_up = NX_FALSE;
/* Check if instance exists. */
if (usb_network_device_ptr -> ux_network_device_usb_instance_ptr)
{
/* Store the physical address in the nx interface. */
nx_interface_ptr -> nx_interface_physical_address_msw = usb_network_device_ptr -> ux_network_physical_address_msw;
nx_interface_ptr -> nx_interface_physical_address_lsw = usb_network_device_ptr -> ux_network_physical_address_lsw;
}
else
{
/* Reset the physical address. */
nx_interface_ptr -> nx_interface_physical_address_msw = 0;
nx_interface_ptr -> nx_interface_physical_address_lsw = 0;
}
/* Operation is successful. */
nx_ip_driver -> nx_ip_driver_status = NX_SUCCESS;
break;
case NX_LINK_ENABLE:
/* Set the link state to UP. */
nx_interface_ptr -> nx_interface_link_up = NX_TRUE;
/* Reflect link state in network device. */
if (usb_network_device_ptr -> ux_network_device_usb_link_up == NX_TRUE)
usb_network_device_ptr -> ux_network_device_link_status = NX_TRUE;
else
usb_network_device_ptr -> ux_network_device_link_status = NX_FALSE;
nx_ip_driver -> nx_ip_driver_status = NX_SUCCESS;
break;
case NX_LINK_DISABLE:
/* Set the link down. */
nx_interface_ptr -> nx_interface_link_up = NX_FALSE;
usb_network_device_ptr -> ux_network_device_link_status = NX_FALSE;
nx_ip_driver -> nx_ip_driver_status = NX_SUCCESS;
break;
case NX_LINK_PACKET_SEND:
case NX_LINK_PACKET_BROADCAST:
case NX_LINK_ARP_SEND:
case NX_LINK_ARP_RESPONSE_SEND:
case NX_LINK_RARP_SEND:
/* Place the ethernet frame at the front of the packet. */
packet_ptr = nx_ip_driver -> nx_ip_driver_packet;
/* Are the sync objects valid? */
if (usb_network_device_ptr -> ux_network_device_activated_by_thread == UX_TRUE)
/* Get mutex for checking link state and setting our state. */
_ux_utility_mutex_on(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
/* Do not send a packet if the link is not enabled. */
if (usb_network_device_ptr -> ux_network_device_link_status == NX_TRUE)
{
/* Increment number of threads inside this instance. */
usb_network_device_ptr -> ux_network_device_num_threads_inside++;
/* Are the sync objects valid? */
if (usb_network_device_ptr -> ux_network_device_activated_by_thread == UX_TRUE)
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
/* Adjust the prepend pointer. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr - NX_ETHERNET_SIZE;
/* Adjust the packet length. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length + NX_ETHERNET_SIZE;
/* Setup the ethernet frame pointer to build the ethernet frame. Back up another 2 bytes to get 32-bit word alignment. */
ethernet_frame_ptr = (ULONG*)(packet_ptr -> nx_packet_prepend_ptr - 2);
/* Build the ethernet frame. */
*ethernet_frame_ptr = nx_ip_driver -> nx_ip_driver_physical_address_msw;
*(ethernet_frame_ptr + 1) = nx_ip_driver -> nx_ip_driver_physical_address_lsw;
*(ethernet_frame_ptr + 2) = (nx_interface_ptr -> nx_interface_physical_address_msw << 16) |
(nx_interface_ptr -> nx_interface_physical_address_lsw >> 16);
*(ethernet_frame_ptr + 3) = (nx_interface_ptr -> nx_interface_physical_address_lsw << 16);
if ((nx_ip_driver -> nx_ip_driver_command == NX_LINK_ARP_SEND)||
(nx_ip_driver -> nx_ip_driver_command == NX_LINK_ARP_RESPONSE_SEND))
{
*(ethernet_frame_ptr+3) |= NX_ETHERNET_ARP;
}
else if (nx_ip_driver -> nx_ip_driver_command == NX_LINK_RARP_SEND)
{
*(ethernet_frame_ptr+3) |= NX_ETHERNET_RARP;
}
else
{
#ifdef FEATURE_NX_IPV6
if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V4)
#endif /* FEATURE_NX_IPV6 */
*(ethernet_frame_ptr+3) |= NX_ETHERNET_IP;
#ifdef FEATURE_NX_IPV6
else if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V6)
*(ethernet_frame_ptr+3) |= NX_ETHERNET_IPV6;
else
{
/* Unknown IP version */
/* free the packet that we will not send */
nx_packet_release(packet_ptr);
nx_ip_driver -> nx_ip_driver_status = NX_NOT_SUCCESSFUL;
break;
}
#endif /* FEATURE_NX_IPV6 */
}
/* Endian swapping if NX_LITTLE_ENDIAN is defined. */
NX_CHANGE_ULONG_ENDIAN(*(ethernet_frame_ptr));
NX_CHANGE_ULONG_ENDIAN(*(ethernet_frame_ptr+1));
NX_CHANGE_ULONG_ENDIAN(*(ethernet_frame_ptr+2));
NX_CHANGE_ULONG_ENDIAN(*(ethernet_frame_ptr+3));
/* Write the packet or queue it. */
nx_ip_driver -> nx_ip_driver_status =
usb_network_device_ptr -> ux_network_device_write_function(usb_network_device_ptr -> ux_network_device_usb_instance_ptr,
packet_ptr);
/* Are the sync objects valid? */
if (usb_network_device_ptr -> ux_network_device_activated_by_thread == UX_TRUE)
{
/* Get mutex. */
_ux_utility_mutex_on(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
/* Decrement number of threads in instance. */
usb_network_device_ptr -> ux_network_device_num_threads_inside--;
/* No more threads in the instance? */
if (usb_network_device_ptr -> ux_network_device_num_threads_inside == 0)
{
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
/* Anyone waiting for us to exit? */
if (usb_network_device_ptr -> ux_network_device_deactivate_thread_waiting == UX_TRUE)
/* Resume deactivate thread waiting. */
_ux_utility_semaphore_put(&usb_network_device_ptr -> ux_network_device_deactivate_semaphore);
}
else
{
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
}
}
}
else
{
/* Are the sync objects valid? */
if (usb_network_device_ptr -> ux_network_device_activated_by_thread == UX_TRUE)
/* Release mutex. */
_ux_utility_mutex_off(&usb_network_device_ptr -> ux_network_device_deactivate_mutex);
/* Link down, throw away packet. */
nx_packet_transmit_release(packet_ptr);
nx_ip_driver -> nx_ip_driver_status = NX_SUCCESS;
/* Report error to application. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CLASS_CDC_ECM_LINK_STATE_DOWN_ERROR);
}
break;
case NX_LINK_UNINITIALIZE:
usb_network_driver_initialized = 0;
break;
case NX_LINK_MULTICAST_JOIN:
case NX_LINK_MULTICAST_LEAVE:
case NX_LINK_GET_STATUS:
case NX_LINK_GET_ERROR_COUNT:
case NX_LINK_GET_RX_COUNT:
case NX_LINK_GET_TX_COUNT:
case NX_LINK_GET_ALLOC_ERRORS:
case NX_LINK_GET_SPEED:
case NX_LINK_GET_DUPLEX_TYPE:
case NX_LINK_USER_COMMAND :
default:
/* Invalid driver request. */
nx_ip_driver -> nx_ip_driver_status = NX_UNHANDLED_COMMAND;
/* Return the link status in the supplied return pointer. */
if(nx_ip_driver -> nx_ip_driver_return_ptr)
*(nx_ip_driver -> nx_ip_driver_return_ptr) = (ULONG)0;
break;
}
}
/* We are done here. */
return;
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_packet_received PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called by USBX when a packet has been receiver over */
/* the USB. */
/* */
/* INPUT */
/* */
/* ux_network_handle Handle of the USB network instance */
/* packet_ptr Pointer to packet received */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* USBX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _ux_network_driver_packet_received(VOID *ux_network_handle, NX_PACKET *packet_ptr)
{
USB_NETWORK_DEVICE_TYPE *usb_network_device_ptr = (USB_NETWORK_DEVICE_TYPE*) ux_network_handle;
ULONG packet_type;
NX_IP *nx_ip;
/* Check the state of the Link. */
if (usb_network_device_ptr -> ux_network_device_link_status != NX_TRUE)
{
/* Link down, throw away packet. */
nx_packet_release(packet_ptr);
return;
}
/* Pickup the packet header to determine where the packet needs to be
sent. */
packet_type = _ux_utility_short_get_big_endian(packet_ptr -> nx_packet_prepend_ptr + 12);
/* Storing in into the packet the interface. */
packet_ptr -> nx_packet_ip_interface = usb_network_device_ptr -> ux_network_device_interface_ptr;
/* Get the IP instance. */
nx_ip = usb_network_device_ptr -> ux_network_device_ip_instance;
/* Route the incoming packet according to its ethernet type. */
switch (packet_type)
{
case NX_ETHERNET_IP :
/* Note: The length reported by some Ethernet hardware includes
bytes after the packet as well as the Ethernet header. In some
cases, the actual packet length after the Ethernet header should
be derived from the length in the IP header (lower 16 bits of
the first 32-bit word). */
/* Clean off the Ethernet header. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr + NX_ETHERNET_SIZE;
/* Adjust the packet length. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length - NX_ETHERNET_SIZE;
/* Route to the ip receive function. */
_nx_ip_packet_deferred_receive(nx_ip, packet_ptr);
break;
case NX_ETHERNET_ARP :
/* Clean off the Ethernet header. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr + NX_ETHERNET_SIZE;
/* Adjust the packet length. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length - NX_ETHERNET_SIZE;
/* Route to the ARP receive function. */
_nx_arp_packet_deferred_receive(nx_ip, packet_ptr);
break;
case NX_ETHERNET_RARP :
/* Clean off the Ethernet header. */
packet_ptr -> nx_packet_prepend_ptr =
packet_ptr -> nx_packet_prepend_ptr + NX_ETHERNET_SIZE;
/* Adjust the packet length. */
packet_ptr -> nx_packet_length =
packet_ptr -> nx_packet_length - NX_ETHERNET_SIZE;
/* Route to the RARP receive function. */
_nx_rarp_packet_deferred_receive(nx_ip, packet_ptr);
break;
default :
/* Invalid ethernet header... release the packet. */
nx_packet_release(packet_ptr);
}
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_link_up PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called by USBX when the line link is up */
/* */
/* INPUT */
/* */
/* ux_network_handle Handle of the USB network instance */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* USBX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _ux_network_driver_link_up(VOID *ux_network_handle)
{
USB_NETWORK_DEVICE_TYPE *usb_network_device_ptr = (USB_NETWORK_DEVICE_TYPE*)ux_network_handle;
/* The USB side of the link is UP. */
usb_network_device_ptr -> ux_network_device_usb_link_up = NX_TRUE;
/* Check if there is an existing interface. */
if (usb_network_device_ptr -> ux_network_device_interface_ptr)
{
/* Set link status. */
if (usb_network_device_ptr -> ux_network_device_interface_ptr -> nx_interface_link_up)
usb_network_device_ptr -> ux_network_device_link_status = NX_TRUE;
else
usb_network_device_ptr -> ux_network_device_link_status = NX_FALSE;
}
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_network_driver_link_down PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called by USBX when the link is down. */
/* */
/* INPUT */
/* */
/* ux_network_handle Handle of the USB network instance */
/* */
/* OUTPUT */
/* */
/* Result */
/* */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* USBX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _ux_network_driver_link_down(VOID *ux_network_handle)
{
USB_NETWORK_DEVICE_TYPE *usb_network_device_ptr = (USB_NETWORK_DEVICE_TYPE*)ux_network_handle;
/* Set the USB link status. */
usb_network_device_ptr -> ux_network_device_usb_link_up = NX_FALSE;
/* Set the link status. */
usb_network_device_ptr -> ux_network_device_link_status = NX_FALSE;
}