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Julius Bairaktaris
f2c521a537
The MAC sends a pause frame only when its buffer-manager port asks for one, and the driver leaves flow control off on every physical BM port, so a link that negotiates TX pause never sends one. Set the BM port's flow control from tx_pause in mac_link_up, as qca-ssdk does in adpt_hppe_port_txfc_status_set(). While any port, class or the CPU port carries a shaper, no BM port asks for pause: a port that pauses moves the shaper's queue into the device on the other end, where SQM cannot reach it. With a 165 Mbit/s upload shaper and a Windows client, ping under load rose by 64 to 92 ms with pause and by 2 ms without. On IPQ8074, with TX pause on lan2 and UDP from a lan2 host to a 100 Mbit/s lan3 link, the sender receives every pause frame the router sends and is throttled to the egress rate without drops; with BM flow control off no pause frame is sent and the egress queue drops. Assisted-by: Claude:claude-opus-5-5 Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de> Link: https://github.com/openwrt/openwrt/pull/25700 Signed-off-by: Robert Marko <robimarko@gmail.com>