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[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: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Kashyap, Desai 2011-06-14 10:56:12 +05:30 committed by James Bottomley
parent ce7b1810de
commit a3e1e55e4b
1 changed files with 23 additions and 0 deletions
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23
drivers/scsi/mpt2sas/mpt2sas_scsih.c
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@ -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__);