pci_enable_msix (9)

int pci_enable_msix(struct pci_dev * dev, struct msix_entry * entries, int nvec);

dev

pointer to the pci_dev data structure of MSI-X device function

entries

pointer to an array of MSI-X entries

nvec

number of MSI-X irqs requested for allocation by device driver

Setup the MSI-X capability structure of device function with the number of requested irqs upon its software driver call to request for MSI-X mode enabled on its hardware device function. A return of zero indicates the successful configuration of MSI-X capability structure with new allocated MSI-X irqs. A return of < 0 indicates a failure. Or a return of > 0 indicates that driver request is exceeding the number of irqs or MSI-X vectors available. Driver should use the returned value to re-send its request.