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[SCSI] libiscsi: hook into ramp up/down handling
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>
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1 changed files with 12 additions and 3 deletions
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@ -1739,10 +1739,19 @@ EXPORT_SYMBOL_GPL(iscsi_queuecommand);
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int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
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{
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if (reason != SCSI_QDEPTH_DEFAULT)
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switch (reason) {
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case SCSI_QDEPTH_DEFAULT:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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break;
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case SCSI_QDEPTH_QFULL:
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scsi_track_queue_full(sdev, depth);
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break;
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case SCSI_QDEPTH_RAMP_UP:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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break;
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default:
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return -EOPNOTSUPP;
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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}
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return sdev->queue_depth;
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}
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EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
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