[SCSI] cxgb3i, iser, iscsi_tcp: set target can queue

Set target can queue limit to the number of preallocated
session tasks we have.

This along with the cxgb3i can_queue patch will fix a throughput
problem where it could only queue one LU worth of data at a time.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

3 files changed, 12 insertions, 0 deletions

diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
index fff8e4327644..b3ca3a05f0d9 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
@@ -883,6 +883,7 @@ static struct scsi_host_template cxgb3i_host_template = {
         .eh_abort_handler       = iscsi_eh_abort,
         .eh_device_reset_handler = iscsi_eh_device_reset,
         .eh_target_reset_handler = iscsi_eh_target_reset,
+        .target_alloc           = iscsi_target_alloc,
         .use_clustering         = DISABLE_CLUSTERING,
         .this_id                = -1,
 };
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index f97fc7e9de79..b7c092d63bbe 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -851,6 +851,7 @@ static struct scsi_host_template iscsi_sw_tcp_sht = {
         .use_clustering         = DISABLE_CLUSTERING,
         .slave_alloc            = iscsi_sw_tcp_slave_alloc,
         .slave_configure        = iscsi_sw_tcp_slave_configure,
+        .target_alloc           = iscsi_target_alloc,
         .proc_name              = "iscsi_tcp",
         .this_id                = -1,
 };
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 689628359169..e72b4ad47d35 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1463,6 +1463,16 @@ int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
 }
 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
 
+int iscsi_target_alloc(struct scsi_target *starget)
+{
+        struct iscsi_cls_session *cls_session = starget_to_session(starget);
+        struct iscsi_session *session = cls_session->dd_data;
+
+        starget->can_queue = session->scsi_cmds_max;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(iscsi_target_alloc);
+
 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
 {
         struct iscsi_session *session = cls_session->dd_data;