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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. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Packet Pool Management (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_packet.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_packet_data_append PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function copies the specified data to the end of the specified */
/* packet. Additional packets are allocated from the specified pool */
/* if needed. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer to packet to append to*/
/* data_start Pointer to start of the data */
/* data_size Number of bytes to append */
/* pool_ptr Pool to allocate packet from */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_packet_allocate Allocate data packet */
/* _nx_packet_release Release data packet */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), and */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_packet_data_append(NX_PACKET *packet_ptr, VOID *data_start, ULONG data_size,
NX_PACKET_POOL *pool_ptr, ULONG wait_option)
{
#ifndef NX_DISABLE_PACKET_CHAIN
UINT status; /* Return status */
NX_PACKET *new_list_ptr; /* Head of new list pointer */
NX_PACKET *last_packet = NX_NULL; /* Last supplied packet */
#endif /* NX_DISABLE_PACKET_CHAIN */
ULONG available_bytes; /* Number of available bytes */
ULONG copy_size; /* Size for each memory copy */
UCHAR *source_ptr; /* Buffer source pointer */
NX_PACKET *work_ptr; /* Working packet pointer */
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_PACKET_DATA_APPEND, packet_ptr, data_start, data_size, pool_ptr, NX_TRACE_PACKET_EVENTS, 0, 0);
#ifndef NX_DISABLE_PACKET_CHAIN
/* Calculate the number of bytes available at the end of the supplied packet. */
if (packet_ptr -> nx_packet_last)
{
/* More than one packet. Walk the packet chain starting at the last packet
to calculate the remaining bytes. */
available_bytes = 0;
work_ptr = packet_ptr -> nx_packet_last;
do
{
/* Calculate the available bytes in this packet. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
/*lint -e{737} suppress loss of sign, since nx_packet_data_end is assumed to be larger than nx_packet_append_ptr. */
available_bytes = available_bytes +
(ULONG)(work_ptr -> nx_packet_data_end - work_ptr -> nx_packet_append_ptr);
/* Remember the last packet. */
last_packet = work_ptr;
/* Move to the next packet. There typically won't be another packet, but just in
case the logic is here for it! */
work_ptr = work_ptr -> nx_packet_next;
} while (work_ptr);
}
else
#endif /* NX_DISABLE_PACKET_CHAIN */
{
/* Just calculate the number of bytes available in the first packet. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
available_bytes = (ULONG)(packet_ptr -> nx_packet_data_end - packet_ptr -> nx_packet_append_ptr);
}
/* Determine if any new packets are required to satisfy this request. */
if (available_bytes < data_size)
{
#ifndef NX_DISABLE_PACKET_CHAIN
/* Setup a temporary head pointer. */
new_list_ptr = NX_NULL;
/* Loop to pickup enough packets to complete the append request. */
while (available_bytes < data_size)
{
/* Allocate a new packet. */
status = _nx_packet_allocate(pool_ptr, &work_ptr, 0, wait_option);
/* Determine if an error is present. */
if (status)
{
/* Yes, an error is present. */
/* First release any packets that have been allocated so far. */
if (new_list_ptr)
{
_nx_packet_release(new_list_ptr);
}
/* Return the error status to the caller of this service. */
return(status);
}
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, work_ptr);
/* No error is present. Link the new packet to the temporary list being built. */
if (new_list_ptr)
{
/* Determine if there is already more than one packet on the list. */
if (new_list_ptr -> nx_packet_last)
{
/* Yes, link up the last packet to the new packet and update the
last pointer. */
/*lint -e{644} suppress variable might not be initialized, since "work_ptr" was initialized in _nx_packet_allocate. */
(new_list_ptr -> nx_packet_last) -> nx_packet_next = work_ptr;
new_list_ptr -> nx_packet_last = work_ptr;
}
else
{
/* Second packet allocated. Just setup the last and next in the
head pointer. */
new_list_ptr -> nx_packet_last = work_ptr;
new_list_ptr -> nx_packet_next = work_ptr;
}
}
else
{
/* Just setup the temporary list head. */
new_list_ptr = work_ptr;
}
/* Adjust the number of available bytes according to how much space
is in the new packet. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
/*lint -e{737} suppress loss of sign, since nx_packet_data_end is assumed to be larger than nx_packet_append_ptr. */
/*lint -e{613} suppress possible use of null pointer, since "work_ptr" was set in _nx_packet_allocate. */
available_bytes = available_bytes +
(ULONG)(work_ptr -> nx_packet_data_end - work_ptr -> nx_packet_append_ptr);
}
/* At this point, all the necessary packets have been allocated and are present
on the temporary list. We need to link this new list to the end of the supplied
packet. */
if (last_packet)
{
/* Already more than one packet. Add the new packet list to the end. */
last_packet -> nx_packet_next = new_list_ptr;
}
else
{
/* Link the new packet list to the head packet. */
packet_ptr -> nx_packet_next = new_list_ptr;
}
/* Clear the last packet that was used to maintain the new list. */
/*lint -e{613} suppress possible use of null pointer, since "new_list_ptr" was set in previous loop. */
new_list_ptr -> nx_packet_last = NX_NULL;
#else
NX_PARAMETER_NOT_USED(pool_ptr);
NX_PARAMETER_NOT_USED(wait_option);
return(NX_SIZE_ERROR);
#endif /* NX_DISABLE_PACKET_CHAIN */
}
/* Setup the new data length in the packet. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length + data_size;
/* Now copy the supplied data buffer at the end of the packet. */
source_ptr = (UCHAR *)data_start;
#ifndef NX_DISABLE_PACKET_CHAIN
if (packet_ptr -> nx_packet_last)
{
work_ptr = packet_ptr -> nx_packet_last;
}
else
{
#endif /* NX_DISABLE_PACKET_CHAIN */
work_ptr = packet_ptr;
#ifndef NX_DISABLE_PACKET_CHAIN
}
while (data_size)
{
/* Determine the amount of memory to copy. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
if (data_size < (ULONG)(work_ptr -> nx_packet_data_end - work_ptr -> nx_packet_append_ptr))
{
copy_size = data_size;
}
else
{
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
copy_size = (ULONG)(work_ptr -> nx_packet_data_end - work_ptr -> nx_packet_append_ptr);
}
#else
copy_size = data_size;
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Copy the data into the current packet buffer. */
memcpy(work_ptr -> nx_packet_append_ptr, source_ptr, copy_size); /* Use case of memcpy is verified. */
/* Adjust the remaining data size. */
data_size = data_size - copy_size;
/* Update this packets append pointer. */
work_ptr -> nx_packet_append_ptr = work_ptr -> nx_packet_append_ptr + copy_size;
#ifndef NX_DISABLE_PACKET_CHAIN
/* Any more data left to append? */
if (data_size)
{
/* Yes, there is more to move. Update the source pointer, move the work pointer
to the next packet in the chain and update the last packet pointer. */
source_ptr = source_ptr + copy_size;
work_ptr = work_ptr -> nx_packet_next;
packet_ptr -> nx_packet_last = work_ptr;
}
}
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Return successful status. */
return(NX_SUCCESS);
}
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