Imported Upstream version 16.04

[deb_dpdk.git] / lib / librte_eal / linuxapp / kni / kni_fifo.h

diff --git a/lib/librte_eal/linuxapp/kni/kni_fifo.h b/lib/librte_eal/linuxapp/kni/kni_fifo.h
new file mode 100644 (file)
index 0000000..3ea750e
--- /dev/null
+++ b/lib/librte_eal/linuxapp/kni/kni_fifo.h
@@ -0,0 +1,108 @@
+/*-
+ * GPL LICENSE SUMMARY
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of version 2 of the GNU 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
+ *   General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *   The full GNU General Public License is included in this distribution
+ *   in the file called LICENSE.GPL.
+ *
+ *   Contact Information:
+ *   Intel Corporation
+ */
+
+#ifndef _KNI_FIFO_H_
+#define _KNI_FIFO_H_
+
+#include <exec-env/rte_kni_common.h>
+
+/**
+ * Adds num elements into the fifo. Return the number actually written
+ */
+static inline unsigned
+kni_fifo_put(struct rte_kni_fifo *fifo, void **data, unsigned num)
+{
+       unsigned i = 0;
+       unsigned fifo_write = fifo->write;
+       unsigned fifo_read = fifo->read;
+       unsigned 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 unsigned
+kni_fifo_get(struct rte_kni_fifo *fifo, void **data, unsigned num)
+{
+       unsigned i = 0;
+       unsigned new_read = fifo->read;
+       unsigned 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 unsigned
+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 unsigned
+kni_fifo_free_count(struct rte_kni_fifo *fifo)
+{
+       return (fifo->read - fifo->write - 1) & (fifo->len - 1);
+}
+
+#ifdef RTE_KNI_VHOST
+/**
+ * Initializes the kni fifo structure
+ */
+static inline void
+kni_fifo_init(struct rte_kni_fifo *fifo, unsigned size)
+{
+       fifo->write = 0;
+       fifo->read = 0;
+       fifo->len = size;
+       fifo->elem_size = sizeof(void *);
+}
+#endif
+
+#endif /* _KNI_FIFO_H_ */