5a7162f62d
such that nfe(4) does not work with MSI-X. When MSI-X support was introduced, I remember MCP55 controller worked without problems so the issue could be either PCI bridge or BIOS issue. But I also noticed snd_hda(4) disabled MSI on all MCP55 chipset so I'm still not sure this is generic issue of MCP55 chipset. If this was PCI bridge issue we would have added it to a system wide black-list table but it's not clear to me at this moment whether it was caused by either broken BIOS or silicon bug of MCP55 chipset. To workaround the issue, maintain a MSI/MSI-X black-list table in driver and lookup base board manufacturer and product name from the table before attempting to use MSI-X. If driver find an matching entry, nfe(4) will not use MSI/MSI-X and fall back on traditional INTx mode. This approach should be the last resort since it relies on smbios and if another instance of MSI/MSI-X breakage is reported with different maker/product, we may have to get the PCI bridge black-listed instead of adding an new entry. PR: kern/152150
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