From: Ching Huang <ching2048@xxxxxxxxxxxx> add driver option cmd_per_lun to set host->cmd_per_lun value by user Signed-off-by: Ching Huang <ching2048@xxxxxxxxxxxx> --- 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);
