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Older drivers and drivers with lower queue counts often have a static array of queues, rather than allocating structs for each queue on demand. Add a helper for adding up qstats from a queue range. Expectation is that driver will pass a queue range [netdev->real_num_*x_queues, MAX). It was tempting to always use num_*x_queues as the end, but virtio seems to clamp its queue count after allocating the netdev. And this way we can trivaly reuse the helper for [0, real_..). Signed-off-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20250507003221.823267-2-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>