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authorJack Wang <jinpu.wang@profitbricks.com>2013-11-07 11:37:37 +0100
committerRoland Dreier <roland@purestorage.com>2013-11-08 14:43:17 -0800
commit71444b97816ae08a1cc435f044f9f1f4cbd51e6a (patch)
tree832d457167b77f33684fc3d2443c5c5a8b0d4da3 /drivers/infiniband
parent4d73f95f708ce540a85113b00f5363d0593d871d (diff)
downloadlinux-71444b97816ae08a1cc435f044f9f1f4cbd51e6a.tar.bz2
IB/srp: Add change_queue_depth and change_queue_type support
Currently, it's not possible to change queue depth for a device behind SRP host. Sometimes, we need to adjust queue_depth for performance reason (eg storage busy, we need lower queue_depth to avoid running into SCSI error handler), so this patch add support for SRP driver. Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com> Tested-by: Bart Van Assche <bvanassche@acm.org> Acked-by: David Dillow <dillowda@ornl.gov> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 6aa660d188a3..a8f8d0b8a777 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -46,6 +46,7 @@
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_tcq.h>
#include <scsi/srp.h>
#include <scsi/scsi_transport_srp.h>
@@ -1882,6 +1883,57 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
return 0;
}
+/**
+ * srp_change_queue_type - changing device queue tag type
+ * @sdev: scsi device struct
+ * @tag_type: requested tag type
+ *
+ * Returns queue tag type.
+ */
+static int
+srp_change_queue_type(struct scsi_device *sdev, int tag_type)
+{
+ if (sdev->tagged_supported) {
+ scsi_set_tag_type(sdev, tag_type);
+ if (tag_type)
+ scsi_activate_tcq(sdev, sdev->queue_depth);
+ else
+ scsi_deactivate_tcq(sdev, sdev->queue_depth);
+ } else
+ tag_type = 0;
+
+ return tag_type;
+}
+
+/**
+ * srp_change_queue_depth - setting device queue depth
+ * @sdev: scsi device struct
+ * @qdepth: requested queue depth
+ * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
+ * (see include/scsi/scsi_host.h for definition)
+ *
+ * Returns queue depth.
+ */
+static int
+srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
+{
+ struct Scsi_Host *shost = sdev->host;
+ int max_depth;
+ if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
+ max_depth = shost->can_queue;
+ if (!sdev->tagged_supported)
+ max_depth = 1;
+ if (qdepth > max_depth)
+ qdepth = max_depth;
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ } else if (reason == SCSI_QDEPTH_QFULL)
+ scsi_track_queue_full(sdev, qdepth);
+ else
+ return -EOPNOTSUPP;
+
+ return sdev->queue_depth;
+}
+
static int srp_send_tsk_mgmt(struct srp_target_port *target,
u64 req_tag, unsigned int lun, u8 func)
{
@@ -2173,6 +2225,8 @@ static struct scsi_host_template srp_template = {
.slave_configure = srp_slave_configure,
.info = srp_target_info,
.queuecommand = srp_queuecommand,
+ .change_queue_depth = srp_change_queue_depth,
+ .change_queue_type = srp_change_queue_type,
.eh_abort_handler = srp_abort,
.eh_device_reset_handler = srp_reset_device,
.eh_host_reset_handler = srp_reset_host,