On Sun, Jan 10, 2021 at 06:55:11PM +0000, Stefan Chulski wrote:

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not connected to the GOP flow control generation mechanism.
To solve this issue Armada has firmware running on CM3 CPU
dedectated for Flow Control support. Firmware monitors Packet
Processor resources and asserts XON/XOFF by writing to Ports Control 0

Register.

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What is the minimum firmware version that supports this?

Support were added to firmware about two years ago.
All releases from 18.09 should has it.

Can you query the firmware and ask its version? We should keep all this code
disabled if the firmware it too old.

     Andrew

This is exactly what " net: mvpp2: add TX FC firmware check " patch do. If handshake of flow control support fail, FC won't be supported.

Stefan.