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 <[email protected]>
---
drivers/scsi/mpt2sas/mpt2sas_base.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index bde63f7..ed810fb 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -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)");
@@ -1420,6 +1424,16 @@ _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) {
--
1.7.1
>>>>> "Sreekanth" == Reddy, Sreekanth <[email protected]> writes:
Sreekanth> Added driver module parameter max_msix_vectors. Using this
Sreekanth> module parameter the maximum number of MSI-X vectors could be
Sreekanth> set.
Sreekanth> The number of MSI-X vectors used would be the minimum of
Sreekanth> MSI-X vectors supported by the HBA, the number of CPU cores
Sreekanth> and the value set to max_msix_vectors module parameters.
--
Martin K. Petersen Oracle Linux Engineering
>>>>> "Sreekanth" == Reddy, Sreekanth <[email protected]> writes:
Sreekanth> Added driver module parameter max_msix_vectors. Using this
Sreekanth> module parameter the maximum number of MSI-X vectors could be
Sreekanth> set.
Sreekanth> The number of MSI-X vectors used would be the minimum of
Sreekanth> MSI-X vectors supported by the HBA, the number of CPU cores
Sreekanth> and the value set to max_msix_vectors module parameters.
Reviewed-by: Martin K. Petersen <[email protected]>
--
Martin K. Petersen Oracle Linux Engineering