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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 */
/** */
/** Asix Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_asix.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_asix_transmission_callback PORTABLE C */
/* 6.3.0 */
/* 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 */
/* _ux_utility_short_put Put 16-bit value */
/* nx_packet_transmit_release Release NetX packet */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
VOID _ux_host_class_asix_transmission_callback (UX_TRANSFER *transfer_request)
{
#if defined(UX_HOST_STANDALONE)
UX_PARAMETER_NOT_USED(transfer_request);
#else
UX_HOST_CLASS_ASIX *asix;
NX_PACKET *current_packet;
NX_PACKET *next_packet;
UCHAR *packet_header;
#ifdef UX_HOST_CLASS_ASIX_PACKET_CHAIN_SUPPORT
ULONG copied;
#endif
/* Get the class instance for this transfer request. */
asix = (UX_HOST_CLASS_ASIX *) transfer_request -> ux_transfer_request_class_instance;
/* Check the state of the transfer. If there is an error, we do not proceed with this report. */
if (transfer_request -> ux_transfer_request_completion_code != UX_SUCCESS)
{
/* We do not proceed. */
return;
}
/* Check if the class is in shutdown. */
if (asix -> ux_host_class_asix_state == UX_HOST_CLASS_INSTANCE_SHUTDOWN)
/* We do not proceed. */
return;
/* Check if there is another transfer for this pipe. */
current_packet = asix -> ux_host_class_asix_xmit_queue;
if (current_packet == UX_NULL)
return;
/* Check if a ZLP is needed. */
if ((transfer_request -> ux_transfer_request_actual_length > 0) &&
((transfer_request -> ux_transfer_request_actual_length %
transfer_request -> ux_transfer_request_packet_length) == 0))
{
transfer_request -> ux_transfer_request_requested_length = 0;
_ux_host_stack_transfer_request(transfer_request);
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. */
asix -> ux_host_class_asix_xmit_queue = next_packet;
/* If there is nothing else or if the link is down no need to rearm a packet. */
if (next_packet != UX_NULL && asix -> ux_host_class_asix_link_state == UX_HOST_CLASS_ASIX_LINK_STATE_UP)
{
/* Load the address of the current packet header of the physical header. */
packet_header = next_packet -> nx_packet_prepend_ptr;
/* Subtract 2 USHORT to store length of the packet. */
packet_header -= sizeof(USHORT) * 2;
/* Store the length of the payload in the first USHORT. */
_ux_utility_short_put(packet_header, (USHORT)(next_packet -> nx_packet_length));
/* Store the negative length of the payload in the first USHORT. */
_ux_utility_short_put(packet_header+ sizeof(USHORT), (USHORT)(~next_packet -> nx_packet_length));
#ifdef UX_HOST_CLASS_ASIX_PACKET_CHAIN_SUPPORT
/* Check if the packets are chained. */
if (next_packet -> nx_packet_next)
{
next_packet -> nx_packet_length += (ULONG)sizeof(USHORT) * 2;
next_packet -> nx_packet_prepend_ptr -= sizeof(USHORT) * 2;
nx_packet_data_extract_offset(next_packet, 0, asix -> ux_host_class_asix_xmit_buffer, next_packet -> nx_packet_length, &copied);
/* Setup the transaction parameters. */
transfer_request -> ux_transfer_request_requested_length = next_packet -> nx_packet_length;
transfer_request -> ux_transfer_request_data_pointer = asix -> ux_host_class_asix_xmit_buffer;
/* Restore packet status. */
next_packet -> nx_packet_length -= (ULONG)sizeof(USHORT) * 2;
next_packet -> nx_packet_prepend_ptr += sizeof(USHORT) * 2;
}
else
#endif
{
/* 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 + (ULONG)sizeof(USHORT) * 2;
}
/* Store the packet that owns this transaction. */
transfer_request -> ux_transfer_request_user_specific = next_packet;
/* Arm another transfer. */
_ux_host_stack_transfer_request(transfer_request);
}
/* 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_ASIX_ETHERNET_SIZE;
current_packet -> nx_packet_length = current_packet -> nx_packet_length - UX_HOST_CLASS_ASIX_ETHERNET_SIZE;
/* And ask Netx to release it. */
nx_packet_transmit_release(current_packet);
/* There is no status to be reported back to the stack. */
return;
#endif
}
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