[ofw][patch][IBBUS] Fix for a bug from Bugzilla 1367

[Smith, Stan]

Hi Leo,
  This patch does not apply, per chance could you send the patched files: bus_driver.c & bus_pnp.c  so I can continue testing?

I'm also concerned about tracking of a 'valid' PDO in ioctl handling.
The CDO gets
+    cl_init_pnp_po_ext( g_ControlDeviceObject, NULL,
+     NULL, bus_globals.dbg_lvl, NULL, NULL );
How can the follow bus_driver.c bus_ioctl.c code function without a valid PDO?
My experiments showed vstat quit working unless the CDO 'always' contained a valid p_next_do?
Which exposed the issue of when removing and HCA, one needed to make sure the HCA/PDO being removed was not the one used by the CDO. If so, then the CDO.p_next_do needed to be refreshed with a 'valid' PDO.
If the HCA being removed is the 'last' HCA, then vstat should indeed fail.

 /* Only pass down if not handled and not PDO device. */
 if( status == STATUS_INVALID_DEVICE_REQUEST && p_ext->cl_ext.p_next_do )
 {
  IoSkipCurrentIrpStackLocation( p_irp );
  status = IoCallDriver( p_ext->cl_ext.p_next_do, p_irp );
 }


thanks,

Stan.

________________________________
From: Leonid Keller [mailto:leonid at mellanox.co.il]
Sent: Sunday, April 05, 2009 6:47 AM
To: Smith, Stan
Cc: ofw at lists.openfabrics.org
Subject: [ofw][patch][IBBUS] Fix for a bug from Bugzilla 1367

Bugzilla 1367: If N cards are installed on a machine, a disabling of the first one will
prevent the work of all applications with the rest cards.

Explanation:
   IBBUS driver creates only first instance of IBAL with a name. All the rest
are unnamed. After removing the first card, the named instance is gone and
applications, which are binding to IBAL by name, can't find it and can't work.

Solution: The fix creates IBBUS Control Device of "\\DosDevices\\Global\\ibal<file://\\DosDevices\\Global\\ibal>" name from IBBUS Driver Entry.
All other devices are created unnamed.



Index: bus/kernel/bus_driver.c
===================================================================
--- bus/kernel/bus_driver.c (revision 2076)
+++ bus/kernel/bus_driver.c (working copy)
@@ -60,6 +60,7 @@


 char node_desc[IB_NODE_DESCRIPTION_SIZE];
+PDEVICE_OBJECT g_ControlDeviceObject=NULL;

 bus_globals_t bus_globals = {
  BUS_DBG_ERROR,
@@ -981,6 +982,11 @@

  RtlInitUnicodeString( &dos_name, L"\\DosDevices\\Global\\ibal<file://\\DosDevices\\Global\\ibal>" );
  IoDeleteSymbolicLink( &dos_name );
+ if (g_ControlDeviceObject)
+ {
+  IoDeleteDevice(g_ControlDeviceObject);
+  g_ControlDeviceObject = NULL;
+ }
  cur_conf = bus_globals.p_pkey_conf;
  while(cur_conf)
  {
@@ -1055,7 +1061,46 @@
  g_bfi_InstanceCount = 0;
  memset(  __out_bcount(sizeof(g_bus_filters)) (void*)g_bus_filters, 0,
    sizeof(g_bus_filters) );
+
+ {
+  UNICODE_STRING dev_name, dos_name;
+  bus_fdo_ext_t *p_ext=NULL;

+  RtlInitUnicodeString( &dev_name, AL_DEVICE_NAME );
+  RtlInitUnicodeString( &dos_name, L"\\DosDevices\\Global\\ibal<file://\\DosDevices\\Global\\ibal>" );
+
+  status = IoCreateDevice( p_driver_obj, sizeof(bus_fdo_ext_t),
+   &dev_name, FILE_DEVICE_BUS_EXTENDER,
+   FILE_DEVICE_SECURE_OPEN, FALSE, &g_ControlDeviceObject );
+  if( !NT_SUCCESS(status) )
+  {
+   g_ControlDeviceObject = NULL;
+   BUS_PRINT( BUS_DBG_ERROR,
+    ("Failed to create ControlDeviceObject, status %x.\n",status) );
+  }
+  else {
+   IoDeleteSymbolicLink( &dos_name );
+   status = IoCreateSymbolicLink( &dos_name, &dev_name );
+   if( !NT_SUCCESS(status) )
+   {
+    IoDeleteDevice( g_ControlDeviceObject );
+    g_ControlDeviceObject = NULL;
+    BUS_PRINT( BUS_DBG_ERROR,
+     ("Failed to create symlink for dos name.\n") );
+   }
+   else {
+    BUS_PRINT( BUS_DBG_ERROR,
+     ("SUCCEEDED to create symlink for ControlDeviceObject.\n") );
+
+    p_ext = g_ControlDeviceObject->DeviceExtension;
+    RtlZeroMemory(p_ext, sizeof *p_ext);
+    cl_init_pnp_po_ext( g_ControlDeviceObject, NULL,
+     NULL, bus_globals.dbg_lvl, NULL, NULL );
+    IoInitializeRemoveLock( &p_ext->cl_ext.stop_lock, 'dtci', 0, 1000 );
+   }
+  }
+ }
+
  BUS_EXIT( BUS_DBG_DRV );
  return STATUS_SUCCESS;
 }
Index: bus/kernel/bus_pnp.c
===================================================================
--- bus/kernel/bus_pnp.c (revision 2077)
+++ bus/kernel/bus_pnp.c (working copy)
@@ -60,6 +60,7 @@
 bus_filter_t   g_bus_filters[MAX_BUS_FILTERS];

 extern ib_al_handle_t gh_al; // NULL if AL needs init.
+extern PDEVICE_OBJECT g_ControlDeviceObject;


 static NTSTATUS
@@ -197,7 +198,7 @@
  /* Create the FDO device object to attach to the stack. */

  /* if 1st Bus Filter Instance, then create device names for user ioctl */
- if ( ic == 1 )
+ if ( ic == 1  && !g_ControlDeviceObject)
  {
   RtlInitUnicodeString( &dev_name, AL_DEVICE_NAME );
   RtlInitUnicodeString( &dos_name, L"\\DosDevices\\Global\\ibal<file://\\DosDevices\\Global\\ibal>" );
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