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MSIX spec requires that device can be operated with all vectors masked, by polling. So the following patchset (lightly tested) adds this ability: when driver reads ISR, the device recalls a pending notification, and returns pending status in the ISR register. The polling driver can operate as follows: - map all VQs and config to the same vector - poll ISR to get status - this also flushes VQ

MSIX spec requires that device can be operated with all vectors masked, by polling. So the following patchset (lightly tested) adds this ability: when driver reads ISR, the device recalls a pending notification, and returns pending status in the ISR register. The polling driver can operate as follows: - map all VQs and config to the same vector - poll ISR to get status - this also flushes VQ