Just to help us all understand "the loop" issue..
Here's an example of driver code which uses the existing MSI-X interfaces,
for a device which can work with either 16, 8, 4, 2, or 1 MSI-X interrupt.
This is from a new driver I'm working on right now:
static int xx_alloc_msix_irqs (struct xx_dev *dev, int nvec)
{
xx_disable_all_irqs(dev);
do {
if (nvec < 2)
xx_prep_for_1_msix_vector(dev);
else if (nvec < 4)
xx_prep_for_2_msix_vectors(dev);
else if (nvec < 8)
xx_prep_for_4_msix_vectors(dev);
else if (nvec < 16)
xx_prep_for_8_msix_vectors(dev);
else
xx_prep_for_16_msix_vectors(dev);
nvec = pci_enable_msix(dev->pdev, dev->irqs, dev->num_vectors);
} while (nvec > 0);
if (nvec) {
kerr(dev->name, "pci_enable_msix() failed, err=%d", nvec);
dev->num_vectors = 0;
return nvec;
}
return 0; /* success */
}
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