On Mon, Jun 02, 2014 at 02:27:51AM -0700, Christoph Hellwig wrote:
> On Thu, May 29, 2014 at 10:53:02AM -0500, Stephen M. Cameron wrote:
> > From: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx>
> >
> > No sense having 8 or 16 reply queues if you only have 4 cpus,
> > and likewise no sense limiting to 8 reply queues if you have
> > many more cpus.
>
> I've applied this as it looks good as-is, but shouldn't we also
> cap the number of MSI-X vectors in common code so that we avoid
> adding this as boilerplate code to lots of drivers?
Maybe so. Thinking about CPU hotplug, is num_online_cpus()
the right cap? Maybe num_possible_cpus() is better in case
additional cpus coming online are anticipated?
-- steve
>
> >
> > Signed-off-by: Stephen M. Cameron <scameron@xxxxxxxxxxxxxxxxxx>
> > Reviewed-by: Mike Miller <michael.miller@xxxxxxxxxxxxx>
> > Reviewed-by: Scott Teel <scott.teel@xxxxxx>
> > ---
> > drivers/scsi/hpsa.c | 2 ++
> > drivers/scsi/hpsa_cmd.h | 2 +-
> > 2 files changed, 3 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> > index b1ecfd8..b903e86 100644
> > --- a/drivers/scsi/hpsa.c
> > +++ b/drivers/scsi/hpsa.c
> > @@ -6157,6 +6157,8 @@ static void hpsa_interrupt_mode(struct ctlr_info *h)
> > if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
> > dev_info(&h->pdev->dev, "MSIX\n");
> > h->msix_vector = MAX_REPLY_QUEUES;
> > + if (h->msix_vector > num_online_cpus())
> > + h->msix_vector = num_online_cpus();
> > err = pci_enable_msix(h->pdev, hpsa_msix_entries,
> > h->msix_vector);
> > if (err > 0) {
> > diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
> > index db89245..104b67b 100644
> > --- a/drivers/scsi/hpsa_cmd.h
> > +++ b/drivers/scsi/hpsa_cmd.h
> > @@ -615,7 +615,7 @@ struct TransTable_struct {
> > u32 RepQCount;
> > u32 RepQCtrAddrLow32;
> > u32 RepQCtrAddrHigh32;
> > -#define MAX_REPLY_QUEUES 8
> > +#define MAX_REPLY_QUEUES 64
> > struct vals32 RepQAddr[MAX_REPLY_QUEUES];
> > };
> >
> >
> > --
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> ---end quoted text---
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