3c45889189
Only one header file (rte_kni_common.h) was in the sub-directory include/exec-env/ This file was installed in a sub-directory of the same name in the makefile-based build. Source and install directories are moved as below: lib/librte_eal/linux/eal/include/exec-env/ -> lib/librte_eal/linux/eal/include/ build/include/exec-env/ -> build/include/ The consequence is to have a file hierarchy a bit more flat. Signed-off-by: Thomas Monjalon <thomas@monjalon.net> Reviewed-by: David Marchand <david.marchand@redhat.com> Tested-by: David Marchand <david.marchand@redhat.com> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright(c) 2010-2014 Intel Corporation.
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*/
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#ifndef _KNI_FIFO_H_
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#define _KNI_FIFO_H_
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#include <rte_kni_common.h>
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/* Skip some memory barriers on Linux < 3.14 */
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#ifndef smp_load_acquire
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#define smp_load_acquire(a) (*(a))
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#endif
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#ifndef smp_store_release
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#define smp_store_release(a, b) *(a) = (b)
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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 uint32_t
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kni_fifo_put(struct rte_kni_fifo *fifo, void **data, uint32_t num)
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{
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uint32_t i = 0;
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uint32_t fifo_write = fifo->write;
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uint32_t fifo_read = smp_load_acquire(&fifo->read);
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uint32_t 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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smp_store_release(&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 actully read
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*/
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static inline uint32_t
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kni_fifo_get(struct rte_kni_fifo *fifo, void **data, uint32_t num)
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{
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uint32_t i = 0;
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uint32_t new_read = fifo->read;
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uint32_t fifo_write = smp_load_acquire(&fifo->write);
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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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smp_store_release(&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 uint32_t
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kni_fifo_count(struct rte_kni_fifo *fifo)
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{
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uint32_t fifo_write = smp_load_acquire(&fifo->write);
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uint32_t fifo_read = smp_load_acquire(&fifo->read);
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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 uint32_t
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kni_fifo_free_count(struct rte_kni_fifo *fifo)
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{
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uint32_t fifo_write = smp_load_acquire(&fifo->write);
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uint32_t fifo_read = smp_load_acquire(&fifo->read);
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return (fifo_read - fifo_write - 1) & (fifo->len - 1);
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}
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#endif /* _KNI_FIFO_H_ */
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