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Add nested_depth_limit to incrementally create deeper nesting levels until the driver rejects. Reports the maximum supported nesting depth on both pass and fail. A device advertising nesting support must support at least depth 2, otherwise nesting is meaningless. Signed-off-by: Mohsin Bashir <hmohsin@meta.com> Link: https://patch.msgid.link/20260805030936.1092907-8-mohsin.bashr@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>