scsi: tcm_loop: Allow queues, can_queue and cmd_per_lun to be settable

Make can_queue, nr_hw_queues and cmd_per_lun settable by the user instead
of hard coding them.

Link: https://lore.kernel.org/r/1604257174-4524-9-git-send-email-michael.christie@oracle.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 16d5a4e117a273bee3db4ac17db80938c2186932..badba437e5f9143549c437ef5fb29048bd3b9d65 100644 (file)
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -46,6 +46,15 @@ static int tcm_loop_hba_no_cnt;
 
 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
 
+static unsigned int tcm_loop_nr_hw_queues = 1;
+module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
+
+static unsigned int tcm_loop_can_queue = 1024;
+module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
+
+static unsigned int tcm_loop_cmd_per_lun = 1024;
+module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
+
 /*
  * Called from struct target_core_fabric_ops->check_stop_free()
  */
@@ -305,10 +314,8 @@ static struct scsi_host_template tcm_loop_driver_template = {
        .eh_abort_handler = tcm_loop_abort_task,
        .eh_device_reset_handler = tcm_loop_device_reset,
        .eh_target_reset_handler = tcm_loop_target_reset,
-       .can_queue              = 1024,
        .this_id                = -1,
        .sg_tablesize           = 256,
-       .cmd_per_lun            = 1024,
        .max_sectors            = 0xFFFF,
        .dma_boundary           = PAGE_SIZE - 1,
        .module                 = THIS_MODULE,
@@ -342,6 +349,9 @@ static int tcm_loop_driver_probe(struct device *dev)
        sh->max_lun = 0;
        sh->max_channel = 0;
        sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
+       sh->nr_hw_queues = tcm_loop_nr_hw_queues;
+       sh->can_queue = tcm_loop_can_queue;
+       sh->cmd_per_lun = tcm_loop_cmd_per_lun;
 
        host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
                    SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |