vhost-scsi: create a vhost-scsi-common abstraction

In order to introduce a new vhost-user-scsi host device type, it makes
sense to abstract part of vhost-scsi into a common parent class. This
commit does exactly that.

Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
Message-Id: <1488479153-21203-3-git-send-email-felipe@nutanix.com>

3 files changed, 52 insertions, 9 deletions

diff --git a/include/hw/virtio/vhost-scsi-common.h b/include/hw/virtio/vhost-scsi-common.h
new file mode 100644
index 0000000..4553be4
--- /dev/null
+++ b/include/hw/virtio/vhost-scsi-common.h
@@ -0,0 +1,48 @@
+/*
+ * vhost_scsi host device
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ *
+ * Author:
+ *  Felipe Franciosi <felipe@nutanix.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef VHOST_SCSI_COMMON_H
+#define VHOST_SCSI_COMMON_H
+
+#include "qemu-common.h"
+#include "hw/qdev.h"
+#include "hw/virtio/virtio-scsi.h"
+#include "hw/virtio/vhost.h"
+#include "hw/fw-path-provider.h"
+
+#define TYPE_VHOST_SCSI_COMMON "vhost-scsi-common"
+#define VHOST_SCSI_COMMON(obj) \
+        OBJECT_CHECK(VHostSCSICommon, (obj), TYPE_VHOST_SCSI_COMMON)
+
+typedef struct VHostSCSICommon {
+    VirtIOSCSICommon parent_obj;
+
+    Error *migration_blocker;
+
+    struct vhost_dev dev;
+    const int *feature_bits;
+    int32_t bootindex;
+    int channel;
+    int target;
+    int lun;
+} VHostSCSICommon;
+
+int vhost_scsi_common_start(VHostSCSICommon *vsc);
+void vhost_scsi_common_stop(VHostSCSICommon *vsc);
+char *vhost_scsi_common_get_fw_dev_path(FWPathProvider *p, BusState *bus,
+                                        DeviceState *dev);
+void vhost_scsi_common_set_config(VirtIODevice *vdev, const uint8_t *config);
+uint64_t vhost_scsi_common_get_features(VirtIODevice *vdev, uint64_t features,
+                                        Error **errp);
+
+#endif /* VHOST_SCSI_COMMON_H */
diff --git a/include/hw/virtio/vhost-scsi.h b/include/hw/virtio/vhost-scsi.h
index 9fd63df..04658d1 100644
--- a/include/hw/virtio/vhost-scsi.h
+++ b/include/hw/virtio/vhost-scsi.h
@@ -18,6 +18,7 @@
 #include "hw/qdev.h"
 #include "hw/virtio/virtio-scsi.h"
 #include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-scsi-common.h"
 
 enum vhost_scsi_vq_list {
     VHOST_SCSI_VQ_CONTROL = 0,
@@ -30,15 +31,7 @@ enum vhost_scsi_vq_list {
         OBJECT_CHECK(VHostSCSI, (obj), TYPE_VHOST_SCSI)
 
 typedef struct VHostSCSI {
-    VirtIOSCSICommon parent_obj;
-
-    Error *migration_blocker;
-
-    struct vhost_dev dev;
-    int32_t bootindex;
-    int channel;
-    int target;
-    int lun;
+    VHostSCSICommon parent_obj;
 } VHostSCSI;
 
 #endif
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index 8c8453c..eac2013 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -49,8 +49,10 @@ struct VirtIOSCSIConf {
     uint32_t num_queues;
     uint32_t max_sectors;
     uint32_t cmd_per_lun;
+#ifdef CONFIG_VHOST_SCSI
     char *vhostfd;
     char *wwpn;
+#endif
     uint32_t boot_tpgt;
     IOThread *iothread;
 };