On 28.09.18 12:07, Claudio Scordino wrote:
> Dear all,
>
> I'm implementing a minimal inmate driver for i210 and I wonder if I have
> understood correctly the usage of the MSI-X functions.
>
> Once the correct MSI-X bar (BAR3, in my case) has been mapped, I need to
> invoke
> both:
>
> int_set_handler(IRQ_VECTOR, irq_handler);
> pci_msix_set_vector(bdf, IRQ_VECTOR, 0);
>
> Is IRQ_VECTOR the value reported by lspci ("pin A routed to IRQ 18") or is it
> the value reported by /proc/interrupts (129, in my specific case) ?
No, it is a free APIC vector in your setup. Can be anything >= 32.
>
> BTW, what is the third argument of pci_msix_set_vector() supposed to contain ?
If your device is able and configured to generate multiple MSI-X vectors (e.g.
one vector per queue, one for maintenance etc.), this links them to the desired
APIC vector.
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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