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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** CDC ECM Class */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/* Include necessary system files. */ |
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#define UX_SOURCE_CODE |
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#include "ux_api.h" |
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#include "ux_host_class_cdc_ecm.h" |
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#include "ux_host_stack.h" |
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#if !defined(UX_HOST_STANDALONE) |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_host_class_cdc_ecm_write PORTABLE C */ |
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/* 6.2.0 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function writes to the cdc_ecm interface. The call is */ |
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/* non-blocking and queues the packet if there is an on-going write. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* cdc_ecm Pointer to cdc_ecm class */ |
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/* packet Packet to write or queue */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* _ux_host_stack_transfer_request Process transfer request */ |
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/* _ux_host_semaphore_put Release protection semaphore */ |
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/* nx_packet_transmit_release Release NetX packet */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_host_class_cdc_ecm_write(VOID *cdc_ecm_class, NX_PACKET *packet) |
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{ |
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UX_INTERRUPT_SAVE_AREA |
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UX_TRANSFER *transfer_request; |
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UINT status; |
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UCHAR *packet_header; |
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UX_HOST_CLASS_CDC_ECM *cdc_ecm; |
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#ifdef UX_HOST_CLASS_CDC_ECM_PACKET_CHAIN_SUPPORT |
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ULONG copied; |
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#endif |
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/* Get the instance. */ |
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cdc_ecm = (UX_HOST_CLASS_CDC_ECM *) cdc_ecm_class; |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_CDC_ECM_WRITE, cdc_ecm, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0) |
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/* We're arming transfer now. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_bulk_out_transfer_check_and_arm_in_process = UX_TRUE; |
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/* We need to disable interrupts here because we need to make sure that if the xmit |
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queue is non-null, it remains non-null until we have queued the packet. |
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Note that we do not have to worry about the case where the queue is null, |
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because we are the only ones that can change it from null to non-null. */ |
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UX_DISABLE |
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/* Ensure the instance is valid. */ |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_state != UX_HOST_CLASS_INSTANCE_LIVE) |
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{ |
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/* Restore interrupts. */ |
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UX_RESTORE |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_ecm, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_HOST_CLASS_INSTANCE_UNKNOWN); |
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} |
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/* Validate packet length. */ |
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✓✓ |
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if (packet -> nx_packet_length > UX_HOST_CLASS_CDC_ECM_NX_PAYLOAD_SIZE) |
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{ |
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/* Restore interrupts. */ |
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UX_RESTORE |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CLASS_ETH_SIZE_ERROR); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_CLASS_ETH_SIZE_ERROR, cdc_ecm, packet -> nx_packet_length, 0, UX_TRACE_ERRORS, 0, 0) |
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return(UX_CLASS_ETH_SIZE_ERROR); |
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} |
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/* Are we in a valid state? */ |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_link_state == UX_HOST_CLASS_CDC_ECM_LINK_STATE_UP) |
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{ |
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/* Check the queue. See if there is something that is being sent. */ |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_head == UX_NULL) |
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{ |
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/* Reset the queue pointer of this packet. */ |
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packet -> nx_packet_queue_next = UX_NULL; |
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/* Memorize this packet at the beginning of the queue. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_head = packet; |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_tail = packet; |
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/* Restore interrupts. */ |
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UX_RESTORE |
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/* Now we need to arm the transfer. */ |
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/* Get the pointer to the bulk out endpoint transfer request. */ |
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transfer_request = &cdc_ecm -> ux_host_class_cdc_ecm_bulk_out_endpoint -> ux_endpoint_transfer_request; |
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#ifdef UX_HOST_CLASS_CDC_ECM_PACKET_CHAIN_SUPPORT |
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✓✓ |
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if (packet -> nx_packet_next != UX_NULL) |
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{ |
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/* Create buffer. */ |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_xmit_buffer == UX_NULL) |
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{ |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_buffer = _ux_utility_memory_allocate(UX_NO_ALIGN, |
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UX_CACHE_SAFE_MEMORY, UX_HOST_CLASS_CDC_ECM_NX_PAYLOAD_SIZE); |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_xmit_buffer == UX_NULL) |
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{ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT); |
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return(UX_MEMORY_INSUFFICIENT); |
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} |
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} |
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/* Put packet to continuous buffer to transfer. */ |
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packet_header = cdc_ecm -> ux_host_class_cdc_ecm_xmit_buffer; |
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nx_packet_data_extract_offset(packet, 0, packet_header, packet -> nx_packet_length, &copied); |
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} |
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else |
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#endif |
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{ |
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/* Load the address of the current packet header at the physical header. */ |
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packet_header = packet -> nx_packet_prepend_ptr; |
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} |
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/* Setup the transaction parameters. */ |
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transfer_request -> ux_transfer_request_data_pointer = packet_header; |
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transfer_request -> ux_transfer_request_requested_length = packet -> nx_packet_length; |
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/* Store the packet that owns this transaction. */ |
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transfer_request -> ux_transfer_request_user_specific = packet; |
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/* Arm the transfer request. */ |
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status = _ux_host_stack_transfer_request(transfer_request); |
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/* Did we successfully arm the transfer? */ |
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✓✓ |
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if (status != UX_SUCCESS) |
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{ |
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/* Clear the queue. No need to clear the tail. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_head = UX_NULL; |
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/* We cleared the queue, so we must free the packet. First |
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we need to clean it before passing it to NetX. */ |
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packet -> nx_packet_prepend_ptr = packet -> nx_packet_prepend_ptr + UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE; |
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packet -> nx_packet_length = packet -> nx_packet_length - UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE; |
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/* And ask Netx to release it. */ |
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nx_packet_transmit_release(packet); |
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/* Could not arm this transfer. */ |
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status = UX_ERROR; |
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} |
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} |
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else |
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{ |
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/* The packet to be sent is the last in the chain. */ |
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packet -> nx_packet_queue_next = NX_NULL; |
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/* Memorize the packet to be sent. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_tail -> nx_packet_queue_next = packet; |
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/* Set the tail. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_xmit_queue_tail = packet; |
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/* Restore interrupts. */ |
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UX_RESTORE |
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/* Successfully added to queue. */ |
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status = UX_SUCCESS; |
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} |
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} |
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else |
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{ |
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/* Link was down. */ |
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/* Restore interrupts. */ |
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UX_RESTORE |
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/* Release the packet. */ |
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packet -> nx_packet_prepend_ptr = packet -> nx_packet_prepend_ptr + UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE; |
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packet -> nx_packet_length = packet -> nx_packet_length - UX_HOST_CLASS_CDC_ECM_ETHERNET_SIZE; |
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nx_packet_transmit_release(packet); |
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/* Report error to application. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CLASS_CDC_ECM_LINK_STATE_DOWN_ERROR); |
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/* Return error. */ |
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status = UX_ERROR; |
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} |
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/* Signal that we are done arming and resume waiting thread if necessary. */ |
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cdc_ecm -> ux_host_class_cdc_ecm_bulk_out_transfer_check_and_arm_in_process = UX_FALSE; |
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✓✓ |
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if (cdc_ecm -> ux_host_class_cdc_ecm_bulk_out_transfer_waiting_for_check_and_arm_to_finish == UX_TRUE) |
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_ux_host_semaphore_put(&cdc_ecm -> ux_host_class_cdc_ecm_bulk_out_transfer_waiting_for_check_and_arm_to_finish_semaphore); |
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/* We are done here. */ |
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return(status); |
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} |
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#endif |