virtio: move vdev->name allocation to generic virtio

Previously vdev->name was being allocated/freed
separately in virtio_pci and virtio_user backends.
Now it's all done in generic virtio library and
cleans up some code.

Change-Id: I810e976d09781c0c9b25c6f7fd957a83aad6c7b8
Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/394704
Reviewed-by: <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>

include/spdk_internal/virtio.h

@@ -256,11 +256,13 @@ void virtqueue_req_add_iovs(struct virtqueue *vq, struct iovec *iovs, uint16_t i
  * Before doing any I/O, it has to be manually started via \c virtio_dev_restart.
  *
  * \param vdev memory for virtio device, must be zeroed
+ * \param name name for the virtio device
  * \param ops backend callbacks
- * \param ctx argument for the backend callbacks
+ * \param ops_ctx argument for the backend callbacks
+ * \return zero on success, or negative error code otherwise
  */
-int virtio_dev_construct(struct virtio_dev *vdev, const struct virtio_dev_ops *ops,
-			 void *ctx);
+int virtio_dev_construct(struct virtio_dev *vdev, const char *name,
+			 const struct virtio_dev_ops *ops, void *ops_ctx);
 
 /**
  * Reset the device and prepare it to be `virtio_dev_start`ed.  This call

lib/virtio/virtio.c

@@ -325,9 +325,22 @@ virtio_negotiate_features(struct virtio_dev *dev, uint64_t req_features)
 }
 
 int
-virtio_dev_construct(struct virtio_dev *vdev, const struct virtio_dev_ops *ops, void *ctx)
+virtio_dev_construct(struct virtio_dev *vdev, const char *name,
+		     const struct virtio_dev_ops *ops, void *ctx)
 {
-	pthread_mutex_init(&vdev->mutex, NULL);
+	int rc;
+
+	vdev->name = strdup(name);
+	if (vdev->name == NULL) {
+		return -ENOMEM;
+	}
+
+	rc = pthread_mutex_init(&vdev->mutex, NULL);
+	if (rc != 0) {
+		free(vdev->name);
+		return -rc;
+	}
+
 	vdev->backend_ops = ops;
 	vdev->ctx = ctx;
 
@@ -370,6 +383,7 @@ virtio_dev_destruct(struct virtio_dev *dev)
 {
 	virtio_dev_backend_ops(dev)->destruct_dev(dev);
 	pthread_mutex_destroy(&dev->mutex);
+	free(dev->name);
 }
 
 static void

lib/virtio/virtio_pci.c

@@ -210,7 +210,6 @@ modern_destruct_dev(struct virtio_dev *vdev)
 	struct spdk_pci_device *pci_dev = hw->pci_dev;
 
 	free_virtio_hw(hw);
-	free(vdev->name);
 	spdk_pci_device_detach(pci_dev);
 }
 
@@ -533,20 +532,12 @@ virtio_pci_dev_init(struct virtio_dev *vdev, const char *name,
 		    struct virtio_pci_ctx *pci_ctx)
 {
 	int rc;
-	char *name_dup;
 
-	name_dup = strdup(name);
-	if (name_dup == NULL) {
-		return -1;
-	}
-
-	rc = virtio_dev_construct(vdev, &modern_ops, pci_ctx);
+	rc = virtio_dev_construct(vdev, name, &modern_ops, pci_ctx);
 	if (rc != 0) {
-		free(name_dup);
 		return -1;
 	}
 
-	vdev->name = name_dup;
 	vdev->is_hw = 1;
 	vdev->modern = 1;
 

lib/virtio/virtio_user.c

@@ -362,7 +362,6 @@ virtio_user_destroy(struct virtio_dev *vdev)
 	struct virtio_user_dev *dev = vdev->ctx;
 
 	close(dev->vhostfd);
-	free(vdev->name);
 	free(dev);
 }
 
@@ -410,7 +409,7 @@ virtio_user_dev_init(struct virtio_dev *vdev, const char *name, const char *path
 		return -1;
 	}
 
-	rc = virtio_dev_construct(vdev, &virtio_user_ops, dev);
+	rc = virtio_dev_construct(vdev, name, &virtio_user_ops, dev);
 	if (rc != 0) {
 		SPDK_ERRLOG("Failed to init device: %s\n", path);
 		free(dev);
@@ -418,11 +417,6 @@ virtio_user_dev_init(struct virtio_dev *vdev, const char *name, const char *path
 	}
 
 	vdev->is_hw = 0;
-	vdev->name = strdup(name);
-	if (!vdev->name) {
-		SPDK_ERRLOG("Failed to reserve memory for controller name: %s\n", path);
-		goto err;
-	}
 
 	snprintf(dev->path, PATH_MAX, "%s", path);
 	dev->queue_size = queue_size;