[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>

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 13d7674..75223f5 100644 (file)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -599,6 +599,7 @@ static struct scsi_host_template iscsi_iser_sht = {
        .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,
        .proc_name              = "iscsi_iser",
        .this_id                = -1,

diff --git a/drivers/scsi/cxgb3i/cxgb3i_iscsi.c b/drivers/scsi/cxgb3i/cxgb3i_iscsi.c
index fff8e43..b3ca3a0 100644 (file)
--- 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 f97fc7e..b7c092d 100644 (file)
--- 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 6896283..e72b4ad 100644 (file)
--- 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;

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 7ffaed2..0289f57 100644 (file)
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -36,6 +36,7 @@ struct scsi_transport_template;
 struct scsi_host_template;
 struct scsi_device;
 struct Scsi_Host;
+struct scsi_target;
 struct scsi_cmnd;
 struct socket;
 struct iscsi_transport;
@@ -350,6 +351,7 @@ extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
                                          bool xmit_can_sleep);
 extern void iscsi_host_remove(struct Scsi_Host *shost);
 extern void iscsi_host_free(struct Scsi_Host *shost);
+extern int iscsi_target_alloc(struct scsi_target *starget);
 
 /*
  * session management