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Without any explicit alignment requirement, we will currently allocate I/O buffers on their own size rounded up to the nearest power of two. This is done to simplify driver transmit code paths, which can assume that a standard Ethernet frame lies within a single physical page and therefore does not need to be split even for devices with DMA engines that cannot cross page boundaries. Limit this automatic alignment to a maximum of the page size, to avoid requiring excessive alignment for unusually large buffers (such as a buffer allocated for an HTTP POST with a large parameter list). Signed-off-by: Michael Brown <mcb30@ipxe.org>
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