Similar to pci_msi_count() for Message Signaled Interrupts (MSI), function pci_msix_count( ) returns the maximum number of supported MSI-X messages.

Hardware-specific This maximum number of supported MSI-X messages is also hardware specific similar to MSI. Some hardwares have support for MSI-X; where as some hardwares doesn't have support at all.

For example, Neterion Xframe II 10GbE adapter supports upto 64 MSI-X messages, whereas Xframe I doesn't have support for MSI-X (but supports MSI). If MSI is not supported by a hardware, this function returns 0.

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