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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-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
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** 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_pool_create PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a pool of fixed-size packets within the */
/* specified memory area. */
/* */
/* INPUT */
/* */
/* pool_ptr Packet Pool control block */
/* name_ptr Packet Pool string pointer */
/* payload_size Size of packet payload */
/* pool_start Starting address of pool */
/* pool_size Number of bytes in pool */
/* */
/* OUTPUT */
/* */
/* status Return status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_packet_pool_create(NX_PACKET_POOL *pool_ptr, CHAR *name_ptr, ULONG payload_size,
VOID *pool_start, ULONG pool_size)
{
TX_INTERRUPT_SAVE_AREA
NX_PACKET_POOL *tail_ptr; /* Working packet pool pointer */
ULONG packets; /* Number of packets in pool */
ULONG original_payload_size; /* Original payload size */
ULONG header_size; /* Rounded header size */
CHAR *packet_ptr; /* Working packet pointer */
CHAR *next_packet_ptr; /* Next packet pointer */
CHAR *end_of_pool; /* End of pool area */
CHAR *payload_address; /* Address of the first payload*/
VOID *rounded_pool_start; /* Rounded stating address */
/* Save the original payload size. */
original_payload_size = payload_size;
/* Align the starting address to four bytes. */
/*lint -e{923} suppress cast between ULONG and pointer. */
rounded_pool_start = (VOID *)((((ALIGN_TYPE)pool_start + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Round the pool size down to something that is evenly divisible by alignment. */
/*lint -e{923} suppress cast between ULONG and pointer. */
pool_size = (ULONG)(((pool_size - ((ALIGN_TYPE)rounded_pool_start - (ALIGN_TYPE)pool_start)) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Set the pool starting address. */
pool_start = rounded_pool_start;
/* Calculate the address of payload. */
/*lint -e{923} suppress cast between ULONG and pointer. */
payload_address = (CHAR *)((ALIGN_TYPE)rounded_pool_start + sizeof(NX_PACKET));
/* Align the address of payload. */
/*lint -e{923} suppress cast between ULONG and pointer. */
payload_address = (CHAR *)((((ALIGN_TYPE)payload_address + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT);
/* Calculate the header size. */
/*lint -e{923} suppress cast between ULONG and pointer. */
header_size = (ULONG)((ALIGN_TYPE)payload_address - (ALIGN_TYPE)rounded_pool_start);
/* Round the packet size up to something that helps guarantee proper alignment for header and payload. */
payload_size = (ULONG)(((header_size + payload_size + NX_PACKET_ALIGNMENT - 1) / NX_PACKET_ALIGNMENT) * NX_PACKET_ALIGNMENT - header_size);
/* Clear pool fields. */
memset(pool_ptr, 0, sizeof(NX_PACKET_POOL));
/* Setup the basic packet pool fields. */
pool_ptr -> nx_packet_pool_name = name_ptr;
pool_ptr -> nx_packet_pool_suspension_list = TX_NULL;
pool_ptr -> nx_packet_pool_suspended_count = 0;
pool_ptr -> nx_packet_pool_start = (CHAR *)pool_start;
pool_ptr -> nx_packet_pool_size = pool_size;
pool_ptr -> nx_packet_pool_payload_size = original_payload_size;
/* Calculate the end of the pool's memory area. */
end_of_pool = ((CHAR *)pool_start) + pool_size;
/* Walk through the pool area, setting up the available packet list. */
packets = 0;
packet_ptr = (CHAR *)rounded_pool_start;
next_packet_ptr = packet_ptr + (payload_size + header_size);
/*lint -e{946} suppress pointer subtraction, since it is necessary. */
while (next_packet_ptr <= end_of_pool)
{
/* Yes, we have another packet. Increment the packet count. */
packets++;
/* Setup the link to the next packet. */
/*lint -e{929} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_queue_next = (NX_PACKET *)next_packet_ptr;
/* Remember that this packet pool is the owner. */
/*lint -e{929} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_pool_owner = pool_ptr;
#ifndef NX_DISABLE_PACKET_CHAIN
/* Clear the next packet pointer. */
/*lint -e{929} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_next = (NX_PACKET *)NX_NULL;
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Mark the packet as free. */
/*lint -e{929} -e{923} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_FREE;
/* Setup the packet data pointers. */
/*lint -e{929} -e{928} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_data_start = (UCHAR *)(packet_ptr + header_size);
/*lint -e{929} -e{928} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_data_end = (UCHAR *)(packet_ptr + header_size + original_payload_size);
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, (NX_PACKET *)packet_ptr);
/* Advance to the next packet. */
packet_ptr = next_packet_ptr;
/* Update the next packet pointer. */
next_packet_ptr = packet_ptr + (payload_size + header_size);
}
/* Backup to the last packet in the pool. */
packet_ptr = packet_ptr - (payload_size + header_size);
/* Set the last packet's forward pointer to NULL. */
/*lint -e{929} -e{740} -e{826} suppress cast of pointer to pointer, since it is necessary */
((NX_PACKET *)packet_ptr) -> nx_packet_queue_next = NX_NULL;
/* Save the remaining information in the pool control packet. */
pool_ptr -> nx_packet_pool_available = packets;
pool_ptr -> nx_packet_pool_total = packets;
/* Set the packet pool available list. */
pool_ptr -> nx_packet_pool_available_list = (NX_PACKET *)pool_start;
/* If trace is enabled, register this object. */
NX_TRACE_OBJECT_REGISTER(NX_TRACE_OBJECT_TYPE_PACKET_POOL, pool_ptr, name_ptr, payload_size, packets);
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_PACKET_POOL_CREATE, pool_ptr, payload_size, pool_start, pool_size, NX_TRACE_PACKET_EVENTS, 0, 0);
/* Disable interrupts to place the packet pool on the created list. */
TX_DISABLE
/* Setup the packet pool ID to make it valid. */
pool_ptr -> nx_packet_pool_id = NX_PACKET_POOL_ID;
/* Place the packet pool on the list of created packet pools. First,
check for an empty list. */
if (_nx_packet_pool_created_ptr)
{
/* Pickup tail pointer. */
tail_ptr = _nx_packet_pool_created_ptr -> nx_packet_pool_created_previous;
/* Place the new packet pool in the list. */
_nx_packet_pool_created_ptr -> nx_packet_pool_created_previous = pool_ptr;
tail_ptr -> nx_packet_pool_created_next = pool_ptr;
/* Setup this packet pool's created links. */
pool_ptr -> nx_packet_pool_created_previous = tail_ptr;
pool_ptr -> nx_packet_pool_created_next = _nx_packet_pool_created_ptr;
}
else
{
/* The created packet pool list is empty. Add packet pool to empty list. */
_nx_packet_pool_created_ptr = pool_ptr;
pool_ptr -> nx_packet_pool_created_next = pool_ptr;
pool_ptr -> nx_packet_pool_created_previous = pool_ptr;
}
/* Increment the number of packet pools created. */
_nx_packet_pool_created_count++;
/* Restore interrupts. */
TX_RESTORE
/* Return NX_SUCCESS. */
return(NX_SUCCESS);
}
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