New upstream version 18.05

[deb_dpdk.git] / 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 (file)
index 0000000..9a4762d
--- /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 <exec-env/rte_kni_common.h>
+
+/**
+ * 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_ */