[SCSI] libiscsi: hook into ramp up/down handling
authorMike Christie <michaelc@cs.wisc.edu>
Wed, 11 Nov 2009 22:34:36 +0000 (16:34 -0600)
committerJames Bottomley <James.Bottomley@suse.de>
Fri, 4 Dec 2009 18:01:39 +0000 (12:01 -0600)
It is rare to get a queue full with iscsi, because targets seem to
just reduce the iscsi cmd window. However, there is at least
one iscsi target that will throw a queue full when overloaded.
This hooks the iscsi code in to the ramp up/down code, so we
can handle it.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
drivers/scsi/libiscsi.c

index 07ec997c5d4ff97d22f9c2ae92b28017f7190fc9..b7689f3d05f529d113a243afd74df6a477438d40 100644 (file)
@@ -1739,10 +1739,19 @@ EXPORT_SYMBOL_GPL(iscsi_queuecommand);
 
 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
 {
-       if (reason != SCSI_QDEPTH_DEFAULT)
+       switch (reason) {
+       case SCSI_QDEPTH_DEFAULT:
+               scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+               break;
+       case SCSI_QDEPTH_QFULL:
+               scsi_track_queue_full(sdev, depth);
+               break;
+       case SCSI_QDEPTH_RAMP_UP:
+               scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+               break;
+       default:
                return -EOPNOTSUPP;
-
-       scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
+       }
        return sdev->queue_depth;
 }
 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);