[SCSI] qla2xxx: Ramp down queue depth for attached SCSI devices when driver resources are low.
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h
index c0462c0..deb8618 100644
--- a/drivers/scsi/qla2xxx/qla_inline.h
+++ b/drivers/scsi/qla2xxx/qla_inline.h
@@ -213,3 +213,22 @@
{
return sizeof(struct gid_list_info) * ha->max_fibre_devices;
}
+
+static inline void
+qla2x00_do_host_ramp_up(scsi_qla_host_t *vha)
+{
+ if (vha->hw->cfg_lun_q_depth >= ql2xmaxqdepth)
+ return;
+
+ /* Wait at least HOST_QUEUE_RAMPDOWN_INTERVAL before ramping up */
+ if (time_before(jiffies, (vha->hw->host_last_rampdown_time +
+ HOST_QUEUE_RAMPDOWN_INTERVAL)))
+ return;
+
+ /* Wait at least HOST_QUEUE_RAMPUP_INTERVAL between each ramp up */
+ if (time_before(jiffies, (vha->hw->host_last_rampup_time +
+ HOST_QUEUE_RAMPUP_INTERVAL)))
+ return;
+
+ set_bit(HOST_RAMP_UP_QUEUE_DEPTH, &vha->dpc_flags);
+}