target/linux/generic/pending-5.4/770-07-net-ethernet-mtk_eth_soc-drop-descriptor-cpu-own-bit.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 26 Aug 2020 17:48:14 +0200
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: drop descriptor cpu-own bit check
   4  in qdma tx cleanup
   5
   6 mtk_poll_tx_qdma already checks the MTK_QTX_DRX_PTR register, which points
   7 at the last completed descriptor.
   8 To slightly improve performance, also remove the register bit which forces
   9 the hardware to write back this bit earlier.
  10
  11 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  12 ---
  13
  14 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  15 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  16 @@ -1368,9 +1368,6 @@ static int mtk_poll_tx_qdma(struct mtk_e
  17                 int mac = 0;
  18
  19                 desc = mtk_qdma_phys_to_virt(ring, desc->txd2);
  20 -               if ((desc->txd3 & TX_DMA_OWNER_CPU) == 0)
  21 -                       break;
  22 -
  23                 tx_buf = mtk_desc_to_tx_buf(ring, desc);
  24                 if (tx_buf->flags & MTK_TX_FLAGS_FPORT1)
  25                         mac = 1;
  26 @@ -2203,7 +2200,7 @@ static int mtk_start_dma(struct mtk_eth
  27
  28         if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
  29                 mtk_w32(eth,
  30 -                       MTK_TX_WB_DDONE | MTK_TX_DMA_EN |
  31 +                       MTK_TX_DMA_EN |
  32                         MTK_TX_BT_32DWORDS | MTK_NDP_CO_PRO |
  33                         MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
  34                         MTK_RX_BT_32DWORDS,