target/linux/generic/backport-5.15/730-18-v6.3-net-ethernet-mtk_eth_soc-fix-tx-throughput-regressio.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 24 Mar 2023 14:56:58 +0100
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: fix tx throughput regression with
   4  direct 1G links
   5
   6 Using the QDMA tx scheduler to throttle tx to line speed works fine for
   7 switch ports, but apparently caused a regression on non-switch ports.
   8
   9 Based on a number of tests, it seems that this throttling can be safely
  10 dropped without re-introducing the issues on switch ports that the
  11 tx scheduling changes resolved.
  12
  13 Link: https://lore.kernel.org/netdev/trinity-92c3826f-c2c8-40af-8339-bc6d0d3ffea4-1678213958520@3c-app-gmx-bs16/
  14 Fixes: f63959c7eec3 ("net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues")
  15 Reported-by: Frank Wunderlich <frank-w@public-files.de>
  16 Reported-by: Daniel Golle <daniel@makrotopia.org>
  17 Tested-by: Daniel Golle <daniel@makrotopia.org>
  18 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  19 ---
  20
  21 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  22 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  23 @@ -676,8 +676,6 @@ static void mtk_mac_link_up(struct phyli
  24                 break;
  25         }
  26
  27 -       mtk_set_queue_speed(mac->hw, mac->id, speed);
  28 -
  29         /* Configure duplex */
  30         if (duplex == DUPLEX_FULL)
  31                 mcr |= MAC_MCR_FORCE_DPX;