From: Ching Huang <ching2...@areca.com.tw>
add driver option cmd_per_lun to set host->cmd_per_lun value by user
Signed-off-by: Ching Huang <ching2...@areca.com.tw>
---
diff -uprN a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
--- a/drivers/scsi/arcmsr/arcmsr.h 2017-08-04 17:40:54.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr.h 2017-08-04 18:12:54.000000000 +0800
@@ -61,7 +61,9 @@ struct device_attribute;
#define ARCMSR_MAX_XFER_SECTORS_C
304
#define ARCMSR_MAX_TARGETID
17
#define ARCMSR_MAX_TARGETLUN
8
-#define ARCMSR_MAX_CMD_PERLUN
ARCMSR_MAX_OUTSTANDING_CMD
+#define ARCMSR_MAX_CMD_PERLUN 128
+#define ARCMSR_DEFAULT_CMD_PERLUN 32
+#define ARCMSR_MIN_CMD_PERLUN 1
#define ARCMSR_MAX_QBUFFER
4096
#define ARCMSR_DEFAULT_SG_ENTRIES
38
#define ARCMSR_MAX_HBB_POSTQUEUE
264
diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
--- a/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-08 18:52:04.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-08 18:52:48.000000000 +0800
@@ -79,6 +79,10 @@ static int host_can_queue = ARCMSR_DEFAU
module_param(host_can_queue, int, S_IRUGO);
MODULE_PARM_DESC(host_can_queue, " adapter queue depth(32 ~ 1024), default is
128");
+static int cmd_per_lun = ARCMSR_DEFAULT_CMD_PERLUN;
+module_param(cmd_per_lun, int, S_IRUGO);
+MODULE_PARM_DESC(cmd_per_lun, " device queue depth(1 ~ 128), default is 32");
+
#define ARCMSR_SLEEPTIME 10
#define ARCMSR_RETRYCOUNT 12
@@ -141,7 +145,7 @@ static struct scsi_host_template arcmsr_
.this_id = ARCMSR_SCSI_INITIATOR_ID,
.sg_tablesize = ARCMSR_DEFAULT_SG_ENTRIES,
.max_sectors = ARCMSR_MAX_XFER_SECTORS_C,
- .cmd_per_lun = ARCMSR_MAX_CMD_PERLUN,
+ .cmd_per_lun = ARCMSR_DEFAULT_CMD_PERLUN,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = arcmsr_host_attrs,
.no_write_same = 1,
@@ -884,7 +888,9 @@ static int arcmsr_probe(struct pci_dev *
if ((host_can_queue < ARCMSR_MIN_OUTSTANDING_CMD) || (host_can_queue >
ARCMSR_MAX_OUTSTANDING_CMD))
host_can_queue = ARCMSR_DEFAULT_OUTSTANDING_CMD;
host->can_queue = host_can_queue; /* max simultaneous cmds */
- host->cmd_per_lun = ARCMSR_MAX_CMD_PERLUN;
+ if ((cmd_per_lun < ARCMSR_MIN_CMD_PERLUN) || (cmd_per_lun >
ARCMSR_MAX_CMD_PERLUN))
+ cmd_per_lun = ARCMSR_DEFAULT_CMD_PERLUN;
+ host->cmd_per_lun = cmd_per_lun;
host->this_id = ARCMSR_SCSI_INITIATOR_ID;
host->unique_id = (bus << 8) | dev_fun;
pci_set_drvdata(pdev, host);
