ns: acknowledge the received creation message

the two phase handsake make the client could initiate the transfer
immediately without the server side send any dummy message first.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

Author: xiaoxiang781216

lib/include/openamp/rpmsg.h

@@ -108,6 +108,7 @@ struct rpmsg_device {
 	rpmsg_ns_bind_cb ns_bind_cb;
 	struct rpmsg_device_ops ops;
 	bool support_ns;
+	bool support_ack;
 };
 
 /**

lib/include/openamp/rpmsg_virtio.h

@@ -28,6 +28,7 @@ extern "C" {
 
 /* The feature bitmap for virtio rpmsg */
 #define VIRTIO_RPMSG_F_NS	0 /* RP supports name service notifications */
+#define VIRTIO_RPMSG_F_ACK	1 /* RP supports name service acknowledge */
 
 /**
  * struct rpmsg_virtio_shm_pool - shared memory pool used for rpmsg buffers

lib/rpmsg/rpmsg.c

@@ -183,10 +183,12 @@ static void rpmsg_unregister_endpoint(struct rpmsg_endpoint *ept)
 
 	rdev = ept->rdev;
 
+	metal_mutex_acquire(&rdev->lock);
 	if (ept->addr != RPMSG_ADDR_ANY)
 		rpmsg_release_address(rdev->bitmap, RPMSG_ADDR_BMP_SIZE,
 				      ept->addr);
 	metal_list_del(&ept->node);
+	metal_mutex_release(&rdev->lock);
 }
 
 void rpmsg_register_endpoint(struct rpmsg_device *rdev,
@@ -230,15 +232,19 @@ int rpmsg_create_ept(struct rpmsg_endpoint *ept, struct rpmsg_device *rdev,
 
 	rpmsg_init_ept(ept, name, addr, dest, cb, unbind_cb);
 	rpmsg_register_endpoint(rdev, ept);
+	metal_mutex_release(&rdev->lock);
 
-	if (rdev->support_ns && ept->dest_addr == RPMSG_ADDR_ANY) {
-		/* Send NS announcement to remote processor */
-		metal_mutex_release(&rdev->lock);
+	/* Send NS announcement/acknowledge to remote processor */
+	if (ept->name[0] && rdev->support_ns &&
+	    ept->dest_addr == RPMSG_ADDR_ANY)
 		status = rpmsg_send_ns_message(ept, RPMSG_NS_CREATE);
-		metal_mutex_acquire(&rdev->lock);
-		if (status)
-			rpmsg_unregister_endpoint(ept);
-	}
+	else if (ept->name[0] && rdev->support_ack &&
+		 ept->dest_addr != RPMSG_ADDR_ANY)
+		status = rpmsg_send_ns_message(ept, RPMSG_NS_CREATE_ACK);
+
+	if (status)
+		rpmsg_unregister_endpoint(ept);
+	return status;
 
 ret_status:
 	metal_mutex_release(&rdev->lock);
@@ -263,7 +269,5 @@ void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 	rdev = ept->rdev;
 	if (ept->name[0] && rdev->support_ns && ept->addr != RPMSG_NS_EPT_ADDR)
 		(void)rpmsg_send_ns_message(ept, RPMSG_NS_DESTROY);
-	metal_mutex_acquire(&rdev->lock);
 	rpmsg_unregister_endpoint(ept);
-	metal_mutex_release(&rdev->lock);
 }

lib/rpmsg/rpmsg_internal.h

@@ -41,12 +41,12 @@ extern "C" {
  *
  * @RPMSG_NS_CREATE: a new remote service was just created
  * @RPMSG_NS_DESTROY: a known remote service was just destroyed
- * @RPMSG_NS_CREATE_WITH_ACK: a new remote service was just created waiting
- *                            acknowledgment.
+ * @RPMSG_NS_CREATE_ACK: acknowledge the previous creation message
  */
 enum rpmsg_ns_flags {
 	RPMSG_NS_CREATE = 0,
 	RPMSG_NS_DESTROY = 1,
+	RPMSG_NS_CREATE_ACK = 2,
 };
 
 /**

lib/rpmsg/rpmsg_virtio.c

@@ -471,13 +471,13 @@ static int rpmsg_virtio_ns_callback(struct rpmsg_endpoint *ept, void *data,
 	metal_mutex_acquire(&rdev->lock);
 	_ept = rpmsg_get_endpoint(rdev, name, RPMSG_ADDR_ANY, dest);
 
-	if (ns_msg->flags & RPMSG_NS_DESTROY) {
+	if (ns_msg->flags == RPMSG_NS_DESTROY) {
 		if (_ept)
 			_ept->dest_addr = RPMSG_ADDR_ANY;
 		metal_mutex_release(&rdev->lock);
 		if (_ept && _ept->ns_unbind_cb)
 			_ept->ns_unbind_cb(ept);
-	} else {
+	} else if (ns_msg->flags == RPMSG_NS_CREATE) {
 		if (!_ept) {
 			/*
 			 * send callback to application, that can
@@ -492,6 +492,11 @@ static int rpmsg_virtio_ns_callback(struct rpmsg_endpoint *ept, void *data,
 			_ept->dest_addr = dest;
 			metal_mutex_release(&rdev->lock);
 		}
+	} else { /* RPMSG_NS_CREATE_ACK */
+		/* save the received destination address */
+		if (_ept)
+			_ept->dest_addr = dest;
+		metal_mutex_release(&rdev->lock);
 	}
 
 	return RPMSG_SUCCESS;
@@ -540,6 +545,7 @@ int rpmsg_init_vdev(struct rpmsg_virtio_device *rvdev,
 #endif /*!VIRTIO_MASTER_ONLY*/
 	vdev->features = rpmsg_virtio_get_features(rvdev);
 	rdev->support_ns = !!(vdev->features & (1 << VIRTIO_RPMSG_F_NS));
+	rdev->support_ack = !!(vdev->features & (1 << VIRTIO_RPMSG_F_ACK));
 
 #ifndef VIRTIO_SLAVE_ONLY
 	if (role == RPMSG_MASTER) {
@@ -635,7 +641,7 @@ int rpmsg_init_vdev(struct rpmsg_virtio_device *rvdev,
 	 * Create name service announcement endpoint if device supports name
 	 * service announcement feature.
 	 */
-	if (rdev->support_ns) {
+	if (rdev->support_ns || rdev->support_ack) {
 		rpmsg_init_ept(&rdev->ns_ept, "NS",
 			       RPMSG_NS_EPT_ADDR, RPMSG_NS_EPT_ADDR,
 			       rpmsg_virtio_ns_callback, NULL);