Messages in this thread | | | Subject | Re: [PATCH 5/7] I/OAT: Add support for MSI and MSI-X | From | Roland Dreier <> | Date | Fri, 20 Jul 2007 12:05:24 -0700 |
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> 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.
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