gomemif: introduce gomemif

golang native memif driver

Type: feature

Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Change-Id: I693156a44011c80025245d25134f5bf5db6eba82
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/extras/gomemif/memif/memif_unsafe.go b/extras/gomemif/memif/memif_unsafe.go
new file mode 100644
index 00000000000..4469d26e982
--- /dev/null
+++ b/extras/gomemif/memif/memif_unsafe.go
@@ -0,0 +1,55 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+package memif
+
+import (
+	"unsafe"
+)
+
+// readHead reads ring head directly form the shared memory
+func (q *Queue) readHead() (head int) {
+	return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])))
+	// return atomicload16(&q.i.regions[q.region].data[q.offset + descHeadOffset])
+}
+
+// readTail reads ring tail directly form the shared memory
+func (q *Queue) readTail() (tail int) {
+	return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])))
+	// return atomicload16(&q.i.regions[q.region].data[q.offset + descTailOffset])
+}
+
+// writeHead writes ring head directly to the shared memory
+func (q *Queue) writeHead(value int) {
+	*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringHeadOffset])) = *(*uint16)(unsafe.Pointer(&value))
+	//atomicstore16(&q.i.regions[q.region].data[q.offset + descHeadOffset], value)
+}
+
+// writeTail writes ring tail directly to the shared memory
+func (q *Queue) writeTail(value int) {
+	*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringTailOffset])) = *(*uint16)(unsafe.Pointer(&value))
+	//atomicstore16(&q.i.regions[q.region].data[q.offset + descTailOffset], value)
+}
+
+func (q *Queue) setDescLength(slot int, length int) {
+	*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringSize+slot*descSize+descLengthOffset])) = *(*uint16)(unsafe.Pointer(&length))
+}
+
+// getFlags reads ring flags directly from the shared memory
+func (q *Queue) getFlags() int {
+	return (int)(*(*uint16)(unsafe.Pointer(&q.i.regions[q.ring.region].data[q.ring.offset+ringFlagsOffset])))
+}