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86b322d999
We currently assume that the buffer index is equal to the descriptor ring index, which is correct only for in-order queues. Out-of-order queues will include a buffer tag value that is copied from the descriptor to the completion. Redefine the data buffers as being indexed by this tag value (rather than by the descriptor ring index), and add a circular ring buffer to allow for tags to be reused in whatever order they are released by the hardware. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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