Not so easy:Intel® 82574 Gigabit Ethernet Controller Family: Datasheet
The 82574L supports the following interrupt modes: • PCI legacy interrupts • PCI MSI - Message Signaled Interrupts • PCI MSI-X - Extended Message Signaled Interrupts
Five MSI-X interrupt vectors are provided (calculated based on four vectors for queues and one vector for other causes). The requested number of vectors is loaded from the MSI_X_N fields in the EEPROM into the PCIe MSI-X capability structure of the function.
But:
