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e3dfc9875d
Add STM32_ETH_TIMESTAMP_RX for the STM32H7, as the one of the legacy STM32 that provides the timestamp of the frames received. Timestamp the PTP version 2 messages, over Ethernet and over UDP, except for the announce, management and signaling messages. The MAC writes the timestamp in a context descriptor after the last descriptor of the frame. The driver reads it before giving the frame to the network stack and passes it in d_rxtime, in the time of the system time of the MAC, the same as /dev/ptp0. A frame that is not timestamped has a time of zero. The timestamp goes over the address of the buffer of the context descriptor, and the code that dropped the context descriptors used a pointer that was never set. Keep the address of the buffer of each RX descriptor, and restore it when a context descriptor is given back. The timestamps of the PTP frames of a grandmaster clock were checked on hardware against the system time of the MAC, and were within the delay of the reads. Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com> Assisted-by: Claude:claude-sonnet-5 |
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