Imported Upstream version 17.05

Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

1 files changed, 169 insertions, 0 deletions

diff --git a/drivers/net/avp/rte_avp_fifo.h b/drivers/net/avp/rte_avp_fifo.h
new file mode 100644
index 00000000..803eb80a
--- /dev/null
+++ b/drivers/net/avp/rte_avp_fifo.h
@@ -0,0 +1,169 @@
+/*-
+ *   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
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     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
+ *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#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_ */