[PATCH net 0/3] net: mvneta: fix the TX queue arbitration and the mqprio teardown

[Josef Schlehofer <pepe.schlehofer@gmail.com>]

The NETA TX arbiter is left at its reset default, which serves the TX
queues in fixed priority. Under load a busy queue starves the others.
OpenWrt has worked around this since 2017 by sending all TX traffic
of its 32-bit boards through queue 0 [1].

Patch 3 serves the queues in weighted round robin. While testing it
with the mqprio offload, two older bugs showed up. Deleting the qdisc
never reaches the driver, and turning the shaper off leaves the
per-queue rate limits in place. Patches 1 and 2 fix them.

The series was tested on a Turris Omnia (Armada 385). The other NETA
variants were not tested, but the driver already programs registers of
the same block (MVNETA_TX_MTU and the token sizes) on all of them.

Replacing an offloaded mqprio qdisc under a new handle still loses the
new configuration, because the old qdisc is torn down after the new
one is set up. Software mqprio behaves the same way, so this series
leaves it alone.

[1] https://github.com/openwrt/openwrt/blob/a5e96c837ead549820867bb83c1ad471e39f5ace/target/linux/mvebu/patches-6.18/700-mvneta-tx-queue-workaround.patch

Josef Schlehofer (3):
  net: mvneta: lift the per-queue TX rate limits
  net: mvneta: fix the removal of the mqprio offload
  net: mvneta: serve the TX queues in weighted round robin

 drivers/net/ethernet/marvell/mvneta.c | 36 ++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)


base-commit: cb284914e749388eef402938bdb3115fe1f6d337
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2.54.0 (Apple Git-157)