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mpt2sas: Added driver module parameter max_msix_vectors 

Added driver module parameter max_msix_vectors. Using this
module parameter the maximum number of MSI-X vectors could be set.

The number of MSI-X vectors used would be the minimum of MSI-X vectors
supported by the HBA, the number of CPU cores and the value set to
max_msix_vectors module parameters.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sreekanth Reddy 2014-09-12 15:35:16 +05:30 committed by Christoph Hellwig
parent 7c160fac54
commit 4e1f20ae4f
1 changed files with 14 additions and 0 deletions
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14
drivers/scsi/mpt2sas/mpt2sas_base.c
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@ -80,6 +80,10 @@ static int msix_disable = -1;
module_param(msix_disable, int, 0);
MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");
static int max_msix_vectors = -1;
module_param(max_msix_vectors, int, 0);
MODULE_PARM_DESC(max_msix_vectors, " max msix vectors ");
static int mpt2sas_fwfault_debug;
MODULE_PARM_DESC(mpt2sas_fwfault_debug, " enable detection of firmware fault "
"and halt firmware - (default=0)");
@ -1402,6 +1406,16 @@ _base_enable_msix(struct MPT2SAS_ADAPTER *ioc)
ioc->reply_queue_count = min_t(int, ioc->cpu_count,
ioc->msix_vector_count);
if (max_msix_vectors > 0) {
ioc->reply_queue_count = min_t(int, max_msix_vectors,
ioc->reply_queue_count);
ioc->msix_vector_count = ioc->reply_queue_count;
}
printk(MPT2SAS_INFO_FMT
"MSI-X vectors supported: %d, no of cores: %d, max_msix_vectors: %d\n",
ioc->name, ioc->msix_vector_count, ioc->cpu_count, max_msix_vectors);
entries = kcalloc(ioc->reply_queue_count, sizeof(struct msix_entry),
GFP_KERNEL);
if (!entries) {