target/linux/generic/backport-5.15/610-v5.13-48-net-ethernet-mtk_eth_soc-reduce-unnecessary-interrup.patch

   1 From 16769a8923fad5a5377253bcd76b0e0d64976c73 Mon Sep 17 00:00:00 2001
   2 From: Felix Fietkau <nbd@nbd.name>
   3 Date: Thu, 22 Apr 2021 22:21:05 -0700
   4 Subject: [PATCH] net: ethernet: mtk_eth_soc: reduce unnecessary interrupts
   5
   6 Avoid rearming interrupt if napi_complete returns false
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 9 +++++----
  13  1 file changed, 5 insertions(+), 4 deletions(-)
  14
  15 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  16 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  17 @@ -1540,8 +1540,8 @@ static int mtk_napi_tx(struct napi_struc
  18         if (status & MTK_TX_DONE_INT)
  19                 return budget;
  20
  21 -       napi_complete(napi);
  22 -       mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
  23 +       if (napi_complete(napi))
  24 +               mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
  25
  26         return tx_done;
  27  }
  28 @@ -1574,8 +1574,9 @@ poll_again:
  29                 remain_budget -= rx_done;
  30                 goto poll_again;
  31         }
  32 -       napi_complete(napi);
  33 -       mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
  34 +
  35 +       if (napi_complete(napi))
  36 +               mtk_rx_irq_enable(eth, MTK_RX_DONE_INT);
  37
  38         return rx_done + budget - remain_budget;
  39  }