[08/14] usb-redir: Change cancelled packet code into a generic packet-id queue

diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 5301a69..603262a 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -43,7 +43,6 @@ 
 #define EP2I(ep_address) (((ep_address & 0x80) >> 3) | (ep_address & 0x0f))
 #define I2EP(i) (((i & 0x10) << 3) | (i & 0x0f))
 
-typedef struct Cancelled Cancelled;
 typedef struct USBRedirDevice USBRedirDevice;
 
 /* Struct to hold buffered packets (iso or int input packets) */
@@ -69,6 +68,18 @@  struct endp_data {
     int bufpq_target_size;
 };
 
+struct PacketIdQueueEntry {
+    uint64_t id;
+    QTAILQ_ENTRY(PacketIdQueueEntry)next;
+};
+
+struct PacketIdQueue {
+    USBRedirDevice *dev;
+    const char *name;
+    QTAILQ_HEAD(, PacketIdQueueEntry) head;
+    int size;
+};
+
 struct USBRedirDevice {
     USBDevice dev;
     /* Properties */
@@ -86,7 +97,7 @@  struct USBRedirDevice {
     int64_t next_attach_time;
     struct usbredirparser *parser;
     struct endp_data endpoint[MAX_ENDPOINTS];
-    QTAILQ_HEAD(, Cancelled) cancelled;
+    struct PacketIdQueue cancelled;
     /* Data for device filtering */
     struct usb_redir_device_connect_header device_info;
     struct usb_redir_interface_info_header interface_info;
@@ -94,11 +105,6 @@  struct USBRedirDevice {
     int filter_rules_count;
 };
 
-struct Cancelled {
-    uint64_t id;
-    QTAILQ_ENTRY(Cancelled)next;
-};
-
 static void usbredir_hello(void *priv, struct usb_redir_hello_header *h);
 static void usbredir_device_connect(void *priv,
     struct usb_redir_device_connect_header *device_connect);
@@ -239,37 +245,75 @@  static int usbredir_write(void *priv, uint8_t *data, int count)
  * Cancelled and buffered packets helpers
  */
 
-static void usbredir_cancel_packet(USBDevice *udev, USBPacket *p)
+static void packet_id_queue_init(struct PacketIdQueue *q,
+    USBRedirDevice *dev, const char *name)
 {
-    USBRedirDevice *dev = DO_UPCAST(USBRedirDevice, dev, udev);
-    Cancelled *c;
+    q->dev = dev;
+    q->name = name;
+    QTAILQ_INIT(&q->head);
+    q->size = 0;
+}
+
+static void packet_id_queue_add(struct PacketIdQueue *q, uint64_t id)
+{
+    USBRedirDevice *dev = q->dev;
+    struct PacketIdQueueEntry *e;
+
+    DPRINTF("adding packet id %"PRIu64" to %s queue\n", id, q->name);
+
+    e = g_malloc0(sizeof(struct PacketIdQueueEntry));
+    e->id = id;
+    QTAILQ_INSERT_TAIL(&q->head, e, next);
+    q->size++;
+}
+
+static int packet_id_queue_remove(struct PacketIdQueue *q, uint64_t id)
+{
+    USBRedirDevice *dev = q->dev;
+    struct PacketIdQueueEntry *e;
+
+    QTAILQ_FOREACH(e, &q->head, next) {
+        if (e->id == id) {
+            DPRINTF("removing packet id %"PRIu64" from %s queue\n",
+                    id, q->name);
+            QTAILQ_REMOVE(&q->head, e, next);
+            q->size--;
+            g_free(e);
+            return 1;
+        }
+    }
+    return 0;
+}
+
+static void packet_id_queue_empty(struct PacketIdQueue *q)
+{
+    USBRedirDevice *dev = q->dev;
+    struct PacketIdQueueEntry *e, *next_e;
 
-    DPRINTF("cancel packet id %"PRIu64"\n", p->id);
+    DPRINTF("removing %d packet-ids from %s queue\n", q->size, q->name);
 
-    c = g_malloc0(sizeof(Cancelled));
-    c->id = p->id;
-    QTAILQ_INSERT_TAIL(&dev->cancelled, c, next);
+    QTAILQ_FOREACH_SAFE(e, &q->head, next, next_e) {
+        QTAILQ_REMOVE(&q->head, e, next);
+        g_free(e);
+    }
+    q->size = 0;
+}
 
+static void usbredir_cancel_packet(USBDevice *udev, USBPacket *p)
+{
+    USBRedirDevice *dev = DO_UPCAST(USBRedirDevice, dev, udev);
+
+    packet_id_queue_add(&dev->cancelled, p->id);
     usbredirparser_send_cancel_data_packet(dev->parser, p->id);
     usbredirparser_do_write(dev->parser);
 }
 
 static int usbredir_is_cancelled(USBRedirDevice *dev, uint64_t id)
 {
-    Cancelled *c;
-
     if (!dev->dev.attached) {
         return 1; /* Treat everything as cancelled after a disconnect */
     }
-
-    QTAILQ_FOREACH(c, &dev->cancelled, next) {
-        if (c->id == id) {
-            QTAILQ_REMOVE(&dev->cancelled, c, next);
-            g_free(c);
-            return 1;
-        }
-    }
-    return 0;
+    return packet_id_queue_remove(&dev->cancelled, id);
 }
 
 static USBPacket *usbredir_find_packet_by_id(USBRedirDevice *dev,
@@ -914,7 +958,7 @@  static int usbredir_initfn(USBDevice *udev)
     dev->chardev_close_bh = qemu_bh_new(usbredir_chardev_close_bh, dev);
     dev->attach_timer = qemu_new_timer_ms(vm_clock, usbredir_do_attach, dev);
 
-    QTAILQ_INIT(&dev->cancelled);
+    packet_id_queue_init(&dev->cancelled, dev, "cancelled");
     for (i = 0; i < MAX_ENDPOINTS; i++) {
         QTAILQ_INIT(&dev->endpoint[i].bufpq);
     }
@@ -933,13 +977,9 @@  static int usbredir_initfn(USBDevice *udev)
 
 static void usbredir_cleanup_device_queues(USBRedirDevice *dev)
 {
-    Cancelled *c, *next_c;
     int i;
 
-    QTAILQ_FOREACH_SAFE(c, &dev->cancelled, next, next_c) {
-        QTAILQ_REMOVE(&dev->cancelled, c, next);
-        g_free(c);
-    }
+    packet_id_queue_empty(&dev->cancelled);
     for (i = 0; i < MAX_ENDPOINTS; i++) {
         usbredir_free_bufpq(dev, I2EP(i));
     }