STM32H7: Ethernet TX callback complete not called intermittently

[emillindq]

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Describe the set-up

• STM32H747I DISCO
• gcc version 9.2.0 (zephyr-crosstool-NG 1.24.0.4)
• This HAL version 1.8.0

Describe the bug
Please refer to zephyrproject-rtos/zephyr#29915 and zephyrproject-rtos/zephyr#29944
To summarize, TxCpltCallback is not called all the time, and it appears to be related to some incomplete memory transactions. A fix is described in provided links: adding __DSB() to a certain line in this HAL and before/after the HAL_ETH_Transmit_IT resolves it, depending on compiler optimization level. However, adding the line in this HAL works in all cases.

How To Reproduce

1. Zephyr ethernet driver waits for a semaphore from TxCpltCallback, but it never comes as the callback is never called. So it times out.

2. Ethernet driver for stm32h7xx (stm32h7xx_hal_eth.c)

3. Just transmit an ethernet package

4. Follow the scenario in the provided links.

Additional context
If you have a first analysis or patch correction, thank you to share your proposal.

Screenshots
If applicable, add screenshots to help explain your problem.

[RKOUSTM]

Hi @emillindq,

Thank you for your contribution. Your report will be transmitted to our development teams to have this update in the frame of a future release. Thank you once more for this contribution.

With regards,

[emillindq]

zephyrproject-rtos/zephyr#30403 fixes this, and so I close this issue