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267408861c
Support STM32_ETH_TIMESTAMP_TX on the STM32H7, as the legacy STM32 do, with the timestamp returned through SO_TIMESTAMPING. When a packet socket asks for the transmit timestamp of a frame, keep a copy of the frame and ask the MAC to timestamp it in the descriptor. When the transmission is done, take the timestamp from the descriptor and give the copy back to the network stack with it, that delivers it to the error queue of the socket. The MAC writes the timestamp over the address of the buffer in the descriptor, so the driver keeps the buffer of these descriptors. The copies that still wait for their timestamp are released when the interface goes down. With a PTP daemon using the peer-to-peer delay mechanism against a grandmaster clock, the path delay measured was between 9.0 and 9.1 us. Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com> Assisted-by: Claude:claude-sonnet-5 |
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