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[SCSI] libiscsi: hook into ramp up/down handling

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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>
This commit is contained in:
Mike Christie 2009-11-11 16:34:36 -06:00 committed by James Bottomley
parent b20d038dff
commit 1796e72291
1 changed files with 12 additions and 3 deletions
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15
drivers/scsi/libiscsi.c
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@ -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);