From 1bd9b61222f3a81ffe770fc00b70ded6e760c42b Mon Sep 17 00:00:00 2001 From: Christian Ehrhardt Date: Fri, 1 Jun 2018 09:09:08 +0200 Subject: New upstream version 18.05 Change-Id: Icd4170ddc4f63aeae5d0559490e5195b5349f9c2 Signed-off-by: Christian Ehrhardt --- kernel/linux/kni/kni_fifo.h | 75 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 kernel/linux/kni/kni_fifo.h (limited to 'kernel/linux/kni/kni_fifo.h') diff --git a/kernel/linux/kni/kni_fifo.h b/kernel/linux/kni/kni_fifo.h new file mode 100644 index 00000000..9a4762de --- /dev/null +++ b/kernel/linux/kni/kni_fifo.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright(c) 2010-2014 Intel Corporation. + */ + +#ifndef _KNI_FIFO_H_ +#define _KNI_FIFO_H_ + +#include + +/** + * Adds num elements into the fifo. Return the number actually written + */ +static inline uint32_t +kni_fifo_put(struct rte_kni_fifo *fifo, void **data, uint32_t num) +{ + uint32_t i = 0; + uint32_t fifo_write = fifo->write; + uint32_t fifo_read = fifo->read; + uint32_t 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; + } + fifo->write = fifo_write; + + return i; +} + +/** + * Get up to num elements from the fifo. Return the number actully read + */ +static inline uint32_t +kni_fifo_get(struct rte_kni_fifo *fifo, void **data, uint32_t num) +{ + uint32_t i = 0; + uint32_t new_read = fifo->read; + uint32_t fifo_write = fifo->write; + + 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); + } + fifo->read = new_read; + + return i; +} + +/** + * Get the num of elements in the fifo + */ +static inline uint32_t +kni_fifo_count(struct rte_kni_fifo *fifo) +{ + return (fifo->len + fifo->write - fifo->read) & (fifo->len - 1); +} + +/** + * Get the num of available elements in the fifo + */ +static inline uint32_t +kni_fifo_free_count(struct rte_kni_fifo *fifo) +{ + return (fifo->read - fifo->write - 1) & (fifo->len - 1); +} + +#endif /* _KNI_FIFO_H_ */ -- cgit 1.2.3-korg