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我在 Linux PTP 内核代码中看到了这 3 个 so_timestamping 标志：SOF_TIMESTAMPING_TX_HARDWARE、SOF_TIMESTAMPING_RX_HARDWARE、SOF_TIMESTAMPING_RAW_HARDWARE。有谁知道 RAW_HARDWARE 和 TX/RX_HARDWARE 标志有什么区别？