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Commit 9c500060 authored by Sreekanth Reddy's avatar Sreekanth Reddy Committed by James Bottomley
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[SCSI] mpt3sas: Added a driver module parameter max_msix_vectors 



Added a 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 parameter.

The default value of this module parameter is set to 8. The default value of
this parameter is set to 8 inorder to reduce the amount of memory required for
Reply Descriptor Post queue.  This is because with the higher MSI-X vectors,
some times kernel is not able to allocate the requested amount of memory and
crash is observed. To overcome this problem, the default value is set to 8.

Signed-off-by: default avatarSreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent a9623da0

drivers/scsi/mpt3sas/mpt3sas_base.c

+14 −0
Original line number Diff line number Diff line
@@ -82,6 +82,10 @@ 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 = 8;

module_param(max_msix_vectors, int, 0);

MODULE_PARM_DESC(max_msix_vectors,

	" max msix vectors - (default=8)");



static int mpt3sas_fwfault_debug;

MODULE_PARM_DESC(mpt3sas_fwfault_debug,
@@ -1721,6 +1725,16 @@ _base_enable_msix(struct MPT3SAS_ADAPTER *ioc) 
	ioc->reply_queue_count = min_t(int, ioc->cpu_count,

	    ioc->msix_vector_count);



	printk(MPT3SAS_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);



	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;

	}



	entries = kcalloc(ioc->reply_queue_count, sizeof(struct msix_entry),

	    GFP_KERNEL);

	if (!entries) {