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Commit a3e1e55e authored by Kashyap, Desai's avatar Kashyap, Desai Committed by James Bottomley
Browse files

[SCSI] mpt2sas: Set max_sector count from module parameter 



This feature is to override the default
max_sectors setting at load time, taking max_sectors as an
command line option when loading the driver.  The setting is
currently hard-coded in the driver to 8192 sectors (4MB transfers).
If max_sectors is specified at load time, minimum specified
setting will be 64, and the maximum is 8192.  The driver will
modify the setting to be on even boundary. If max_sectors is not
specified, the driver will default to 8192.

Signed-off-by: default avatarKashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent ce7b1810

drivers/scsi/mpt2sas/mpt2sas_scsih.c

+23 −0
Original line number Diff line number Diff line
@@ -94,6 +94,10 @@ static u32 logging_level; 
MODULE_PARM_DESC(logging_level, " bits for enabling additional logging info "

    "(default=0)");



static ushort max_sectors = 0xFFFF;

module_param(max_sectors, ushort, 0);

MODULE_PARM_DESC(max_sectors, "max sectors, range 64 to 8192  default=8192");



/* scsi-mid layer global parmeter is max_report_luns, which is 511 */

#define MPT2SAS_MAX_LUN (16895)

static int max_lun = MPT2SAS_MAX_LUN;
@@ -7436,6 +7440,25 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
	shost->transportt = mpt2sas_transport_template;

	shost->unique_id = ioc->id;



	if (max_sectors != 0xFFFF) {

		if (max_sectors < 64) {

			shost->max_sectors = 64;

			printk(MPT2SAS_WARN_FMT "Invalid value %d passed "

			    "for max_sectors, range is 64 to 8192. Assigning "

			    "value of 64.\n", ioc->name, max_sectors);

		} else if (max_sectors > 8192) {

			shost->max_sectors = 8192;

			printk(MPT2SAS_WARN_FMT "Invalid value %d passed "

			    "for max_sectors, range is 64 to 8192. Assigning "

			    "default value of 8192.\n", ioc->name,

			    max_sectors);

		} else {

			shost->max_sectors = max_sectors & 0xFFFE;

			printk(MPT2SAS_INFO_FMT "The max_sectors value is "

			    "set to %d\n", ioc->name, shost->max_sectors);

		}

	}



	if ((scsi_add_host(shost, &pdev->dev))) {

		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",

		    ioc->name, __FILE__, __LINE__, __func__);