Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[cascardo/linux.git] / drivers / net / xen-netback / xenbus.c

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 6a31f26..9911b4e 100644 (file)
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -165,7 +165,7 @@ xenvif_write_io_ring(struct file *filp, const char __user *buf, size_t count,
        return count;
 }
 
-static int xenvif_dump_open(struct inode *inode, struct file *filp)
+static int xenvif_io_ring_open(struct inode *inode, struct file *filp)
 {
        int ret;
        void *queue = NULL;
@@ -179,13 +179,35 @@ static int xenvif_dump_open(struct inode *inode, struct file *filp)
 
 static const struct file_operations xenvif_dbg_io_ring_ops_fops = {
        .owner = THIS_MODULE,
-       .open = xenvif_dump_open,
+       .open = xenvif_io_ring_open,
        .read = seq_read,
        .llseek = seq_lseek,
        .release = single_release,
        .write = xenvif_write_io_ring,
 };
 
+static int xenvif_read_ctrl(struct seq_file *m, void *v)
+{
+       struct xenvif *vif = m->private;
+
+       xenvif_dump_hash_info(vif, m);
+
+       return 0;
+}
+
+static int xenvif_ctrl_open(struct inode *inode, struct file *filp)
+{
+       return single_open(filp, xenvif_read_ctrl, inode->i_private);
+}
+
+static const struct file_operations xenvif_dbg_ctrl_ops_fops = {
+       .owner = THIS_MODULE,
+       .open = xenvif_ctrl_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+};
+
 static void xenvif_debugfs_addif(struct xenvif *vif)
 {
        struct dentry *pfile;
@@ -210,6 +232,17 @@ static void xenvif_debugfs_addif(struct xenvif *vif)
                                pr_warn("Creation of io_ring file returned %ld!\n",
                                        PTR_ERR(pfile));
                }
+
+               if (vif->ctrl_task) {
+                       pfile = debugfs_create_file("ctrl",
+                                                   S_IRUSR,
+                                                   vif->xenvif_dbg_root,
+                                                   vif,
+                                                   &xenvif_dbg_ctrl_ops_fops);
+                       if (IS_ERR_OR_NULL(pfile))
+                               pr_warn("Creation of ctrl file returned %ld!\n",
+                                       PTR_ERR(pfile));
+               }
        } else
                netdev_warn(vif->dev,
                            "Creation of vif debugfs dir returned %ld!\n",
@@ -271,6 +304,11 @@ static int netback_probe(struct xenbus_device *dev,
        be->dev = dev;
        dev_set_drvdata(&dev->dev, be);
 
+       be->state = XenbusStateInitialising;
+       err = xenbus_switch_state(dev, XenbusStateInitialising);
+       if (err)
+               goto fail;
+
        sg = 1;
 
        do {
@@ -383,11 +421,6 @@ static int netback_probe(struct xenbus_device *dev,
 
        be->hotplug_script = script;
 
-       err = xenbus_switch_state(dev, XenbusStateInitWait);
-       if (err)
-               goto fail;
-
-       be->state = XenbusStateInitWait;
 
        /* This kicks hotplug scripts, so do it immediately. */
        err = backend_create_xenvif(be);
@@ -492,20 +525,20 @@ static inline void backend_switch_state(struct backend_info *be,
 
 /* Handle backend state transitions:
  *
- * The backend state starts in InitWait and the following transitions are
+ * The backend state starts in Initialising and the following transitions are
  * allowed.
  *
- * InitWait -> Connected
- *
- *    ^    \         |
- *    |     \        |
- *    |      \       |
- *    |       \      |
- *    |        \     |
- *    |         \    |
- *    |          V   V
+ * Initialising -> InitWait -> Connected
+ *          \
+ *           \        ^    \         |
+ *            \       |     \        |
+ *             \      |      \       |
+ *              \     |       \      |
+ *               \    |        \     |
+ *                \   |         \    |
+ *                 V  |          V   V
  *
- *  Closed  <-> Closing
+ *                  Closed  <-> Closing
  *
  * The state argument specifies the eventual state of the backend and the
  * function transitions to that state via the shortest path.
@@ -515,6 +548,20 @@ static void set_backend_state(struct backend_info *be,
 {
        while (be->state != state) {
                switch (be->state) {
+               case XenbusStateInitialising:
+                       switch (state) {
+                       case XenbusStateInitWait:
+                       case XenbusStateConnected:
+                       case XenbusStateClosing:
+                               backend_switch_state(be, XenbusStateInitWait);
+                               break;
+                       case XenbusStateClosed:
+                               backend_switch_state(be, XenbusStateClosed);
+                               break;
+                       default:
+                               BUG();
+                       }
+                       break;
                case XenbusStateClosed:
                        switch (state) {
                        case XenbusStateInitWait: