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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-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
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** CDC-ECM Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_cdc_ecm.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_ecm_transmission_callback PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the callback from the USBX transfer functions, */
/* it is called when a full or partial transfer has been done for a */
/* bulk out transfer. */
/* */
/* INPUT */
/* */
/* transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* nx_packet_transmit_release Release NetX packet */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
VOID _ux_host_class_cdc_ecm_transmission_callback(UX_TRANSFER *transfer_request)
{
#if defined(UX_HOST_STANDALONE)
UX_PARAMETER_NOT_USED(transfer_request);
#else
UX_HOST_CLASS_CDC_ECM *cdc_ecm;
NX_PACKET *current_packet;
NX_PACKET *next_packet;
UCHAR *packet_header;
#ifdef UX_HOST_CLASS_CDC_ECM_PACKET_CHAIN_SUPPORT
ULONG copied;
#endif
/* Get the data and control class instances for this transfer request. */
cdc_ecm = (UX_HOST_CLASS_CDC_ECM *) transfer_request -> ux_transfer_request_class_instance;
/* Is the link not up, or the class is shutting down? */
if (cdc_ecm -> ux_host_class_cdc_ecm_link_state != UX_HOST_CLASS_CDC_ECM_LINK_STATE_UP ||
cdc_ecm -> ux_host_class_cdc_ecm_state == UX_HOST_CLASS_INSTANCE_SHUTDOWN)
/* The CDC-ECM thread or deactivation routine is in the process of freeing
the queue. Just return so we are not simultaneously accessing it. */
return;
/* Get the packet associated with this transfer. */
current_packet = cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_head;
/* Do a sanity check on the packet. */
if (current_packet == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_FATAL_ERROR);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_INTERFACE_HANDLE_UNKNOWN, cdc_ecm, 0, 0, UX_FATAL_ERROR, 0, 0)
/* Something went terribly wrong. Do not proceed. */
return;
}
/* Check the state of the transfer. */
if (transfer_request -> ux_transfer_request_completion_code == UX_SUCCESS)
{
/* Check if the transfer length is not zero and it is multiple of MPS (validated on device enum). */
if ((transfer_request -> ux_transfer_request_requested_length != 0) &&
(transfer_request -> ux_transfer_request_requested_length % transfer_request -> ux_transfer_request_packet_length) == 0)
{
/* Set transfer request length to zero. */
transfer_request -> ux_transfer_request_requested_length = 0;
/* Send the transfer. */
_ux_host_stack_transfer_request(transfer_request);
/* Finished processing. */
return;
}
/* Get the next packet associated with the first packet. */
next_packet = current_packet -> nx_packet_queue_next;
/* Set the next packet (or a NULL value) as the head of the xmit queue. */
cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_head = next_packet;
/* If there is nothing else or if the link is down no need to rearm a packet. */
if (next_packet != UX_NULL)
{
#ifdef UX_HOST_CLASS_CDC_ECM_PACKET_CHAIN_SUPPORT
if (next_packet -> nx_packet_next != UX_NULL)
{
/* Put packet to continuous buffer to transfer. */
packet_header = cdc_ecm -> ux_host_class_cdc_ecm_xmit_buffer;
nx_packet_data_extract_offset(next_packet, 0, packet_header, next_packet -> nx_packet_length, &copied);
}
else
#endif
{
/* Load the address of the current packet header at the physical header. */
packet_header = next_packet -> nx_packet_prepend_ptr;
}
/* Prepare the values for this new transmission. */
transfer_request -> ux_transfer_request_data_pointer = packet_header;
transfer_request -> ux_transfer_request_requested_length = next_packet -> nx_packet_length;
/* Store the packet that owns this transaction. */
transfer_request -> ux_transfer_request_user_specific = next_packet;
/* If error log is enabled, insert this message into the log buffer. */
UX_DEBUG_LOG("_ux_host_class_cdc_ecm_transmission_callback", "Sending packet", next_packet, next_packet, _ux_system_mutex_suspended_count(&_ux_system -> ux_system_mutex))
/* If there is an error, the system will hang up. Not much we can do to
fix this. */
_ux_host_stack_transfer_request(transfer_request);
}
/* If error log is enabled, insert this message into the log buffer. */
UX_DEBUG_LOG("_ux_host_class_cdc_ecm_transmission_callback", "Freeing transmitted packet", 0, transfer_request, current_packet)
/* Free the packet that was just sent. First do some housekeeping. */
current_packet -> nx_packet_prepend_ptr = current_packet -> nx_packet_prepend_ptr + UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE;
current_packet -> nx_packet_length = current_packet -> nx_packet_length - UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE;
/* And ask Netx to release it. */
nx_packet_transmit_release(current_packet);
}
else
{
/* The transfer failed. Retry it. Note that this can't be a transfer
abort, because otherwise the link is either down or the class is in
shutdown, both of which are checked for at the beginning. */
_ux_host_stack_transfer_request(transfer_request);
}
/* There is no status to be reported back to the stack. */
return;
#endif
}
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