/usr/share/dpdk/x86_64-default-linuxapp-gcc/include/rte_avp_fifo.h is in dpdk-dev 17.11.1-6.
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* This file is provided under a dual BSD/LGPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GNU LESSER GENERAL PUBLIC LICENSE
*
* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
* Copyright(c) 2014 Wind River Systems, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Contact Information:
* Wind River Systems, Inc.
*
*
* BSD LICENSE
*
* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
* Copyright(c) 2013-2017 Wind River Systems, Inc. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
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* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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*/
#ifndef _RTE_AVP_FIFO_H_
#define _RTE_AVP_FIFO_H_
#include "rte_avp_common.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef __KERNEL__
/* Write memory barrier for kernel compiles */
#define AVP_WMB() smp_wmb()
/* Read memory barrier for kernel compiles */
#define AVP_RMB() smp_rmb()
#else
/* Write memory barrier for userspace compiles */
#define AVP_WMB() rte_wmb()
/* Read memory barrier for userspace compiles */
#define AVP_RMB() rte_rmb()
#endif
#ifndef __KERNEL__
#include <rte_debug.h>
/**
* Initializes the avp fifo structure
*/
static inline void
avp_fifo_init(struct rte_avp_fifo *fifo, unsigned int size)
{
/* Ensure size is power of 2 */
if (size & (size - 1))
rte_panic("AVP fifo size must be power of 2\n");
fifo->write = 0;
fifo->read = 0;
fifo->len = size;
fifo->elem_size = sizeof(void *);
}
#endif
/**
* Adds num elements into the fifo. Return the number actually written
*/
static inline unsigned
avp_fifo_put(struct rte_avp_fifo *fifo, void **data, unsigned int num)
{
unsigned int i = 0;
unsigned int fifo_write = fifo->write;
unsigned int fifo_read = fifo->read;
unsigned int new_write = fifo_write;
for (i = 0; i < num; i++) {
new_write = (new_write + 1) & (fifo->len - 1);
if (new_write == fifo_read)
break;
fifo->buffer[fifo_write] = data[i];
fifo_write = new_write;
}
AVP_WMB();
fifo->write = fifo_write;
return i;
}
/**
* Get up to num elements from the fifo. Return the number actually read
*/
static inline unsigned int
avp_fifo_get(struct rte_avp_fifo *fifo, void **data, unsigned int num)
{
unsigned int i = 0;
unsigned int new_read = fifo->read;
unsigned int fifo_write = fifo->write;
if (new_read == fifo_write)
return 0; /* empty */
for (i = 0; i < num; i++) {
if (new_read == fifo_write)
break;
data[i] = fifo->buffer[new_read];
new_read = (new_read + 1) & (fifo->len - 1);
}
AVP_RMB();
fifo->read = new_read;
return i;
}
/**
* Get the num of elements in the fifo
*/
static inline unsigned int
avp_fifo_count(struct rte_avp_fifo *fifo)
{
return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1);
}
/**
* Get the num of available elements in the fifo
*/
static inline unsigned int
avp_fifo_free_count(struct rte_avp_fifo *fifo)
{
return (fifo->read - fifo->write - 1) & (fifo->len - 1);
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_AVP_FIFO_H_ */
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