> Both igb (recently posted) and ixgbe (also recently posted) support both
> MSI and MSI-X. Right now when we try to request MSI-X vectors, if we
> fail to acquire what we've asked for, we fall back to MSI support. If
> MSI fails to initialize, we fall back to legacy interrupts. So it needs
> to be there in case MSI-X allocation fails for the NIC driver.
Hmm, I see I don't understand what this driver is doing. What is a
"struct ioatdma_device"? Is this driver requesting interrupts that
come from the NIC or the IOAT DMA engine?
Anyway, if the NICs support MSI-X, is there any chance of failing to
get one MSI-X vectors but then succeeding in getting MSI enabled?
How could that happen? I don't see what falling back to MSI buys you
beyond more code.
- R.
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