50da8b0de8
As per the following commit the AVP files maintained by Wind River are
converted to use the SPDX license tag format.
commit a4862c9e1a ("license: introduce SPDX identifiers")
Signed-off-by: Allain Legacy <allain.legacy@windriver.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/* SPDX-License-Identifier: (BSD-3-Clause OR LGPL-2.1)
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* Copyright(c) 2010-2013 Intel Corporation.
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* Copyright(c) 2013-2017 Wind River Systems, Inc.
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*/
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#ifndef _RTE_AVP_FIFO_H_
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#define _RTE_AVP_FIFO_H_
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#include "rte_avp_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef __KERNEL__
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/* Write memory barrier for kernel compiles */
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#define AVP_WMB() smp_wmb()
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/* Read memory barrier for kernel compiles */
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#define AVP_RMB() smp_rmb()
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#else
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/* Write memory barrier for userspace compiles */
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#define AVP_WMB() rte_wmb()
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/* Read memory barrier for userspace compiles */
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#define AVP_RMB() rte_rmb()
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#endif
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#ifndef __KERNEL__
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#include <rte_debug.h>
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/**
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* Initializes the avp fifo structure
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*/
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static inline void
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avp_fifo_init(struct rte_avp_fifo *fifo, unsigned int size)
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{
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/* Ensure size is power of 2 */
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if (size & (size - 1))
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rte_panic("AVP fifo size must be power of 2\n");
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fifo->write = 0;
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fifo->read = 0;
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fifo->len = size;
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fifo->elem_size = sizeof(void *);
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}
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#endif
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/**
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* Adds num elements into the fifo. Return the number actually written
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*/
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static inline unsigned
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avp_fifo_put(struct rte_avp_fifo *fifo, void **data, unsigned int num)
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{
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unsigned int i = 0;
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unsigned int fifo_write = fifo->write;
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unsigned int fifo_read = fifo->read;
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unsigned int new_write = fifo_write;
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for (i = 0; i < num; i++) {
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new_write = (new_write + 1) & (fifo->len - 1);
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if (new_write == fifo_read)
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break;
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fifo->buffer[fifo_write] = data[i];
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fifo_write = new_write;
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}
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AVP_WMB();
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fifo->write = fifo_write;
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return i;
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}
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/**
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* Get up to num elements from the fifo. Return the number actually read
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*/
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static inline unsigned int
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avp_fifo_get(struct rte_avp_fifo *fifo, void **data, unsigned int num)
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{
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unsigned int i = 0;
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unsigned int new_read = fifo->read;
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unsigned int fifo_write = fifo->write;
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if (new_read == fifo_write)
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return 0; /* empty */
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for (i = 0; i < num; i++) {
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if (new_read == fifo_write)
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break;
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data[i] = fifo->buffer[new_read];
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new_read = (new_read + 1) & (fifo->len - 1);
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}
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AVP_RMB();
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fifo->read = new_read;
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return i;
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}
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/**
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* Get the num of elements in the fifo
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*/
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static inline unsigned int
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avp_fifo_count(struct rte_avp_fifo *fifo)
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{
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return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1);
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}
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/**
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* Get the num of available elements in the fifo
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*/
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static inline unsigned int
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avp_fifo_free_count(struct rte_avp_fifo *fifo)
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{
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return (fifo->read - fifo->write - 1) & (fifo->len - 1);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_AVP_FIFO_H_ */
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