target/linux/ramips/patches-5.4/0400-net-ethernet-mediatek-use-napi_consume_skb.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Mon, 8 Jun 2020 17:01:12 +0200
   3 Subject: [PATCH] net: ethernet: mediatek: use napi_consume_skb
   4
   5 Should improve performance, since it can use bulk free
   6
   7 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   8 ---
   9
  10 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  11 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  12 @@ -844,7 +844,8 @@ static int txd_to_idx(struct mtk_tx_ring
  13         return ((void *)dma - (void *)ring->dma) / sizeof(*dma);
  14  }
  15
  16 -static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf)
  17 +static void mtk_tx_unmap(struct mtk_eth *eth, struct mtk_tx_buf *tx_buf,
  18 +                        bool napi)
  19  {
  20         if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA)) {
  21                 if (tx_buf->flags & MTK_TX_FLAGS_SINGLE0) {
  22 @@ -876,8 +877,12 @@ static void mtk_tx_unmap(struct mtk_eth
  23
  24         tx_buf->flags = 0;
  25         if (tx_buf->skb &&
  26 -           (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC))
  27 -               dev_kfree_skb_any(tx_buf->skb);
  28 +           (tx_buf->skb != (struct sk_buff *)MTK_DMA_DUMMY_DESC)) {
  29 +               if (napi)
  30 +                       napi_consume_skb(tx_buf->skb, napi);
  31 +               else
  32 +                       dev_kfree_skb_any(tx_buf->skb);
  33 +       }
  34         tx_buf->skb = NULL;
  35  }
  36
  37 @@ -1055,7 +1060,7 @@ err_dma:
  38                 tx_buf = mtk_desc_to_tx_buf(ring, itxd);
  39
  40                 /* unmap dma */
  41 -               mtk_tx_unmap(eth, tx_buf);
  42 +               mtk_tx_unmap(eth, tx_buf, false);
  43
  44                 itxd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
  45                 if (!MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
  46 @@ -1373,7 +1378,7 @@ static int mtk_poll_tx_qdma(struct mtk_e
  47                         done[mac]++;
  48                         budget--;
  49                 }
  50 -               mtk_tx_unmap(eth, tx_buf);
  51 +               mtk_tx_unmap(eth, tx_buf, true);
  52
  53                 ring->last_free = desc;
  54                 atomic_inc(&ring->free_count);
  55 @@ -1410,7 +1415,7 @@ static int mtk_poll_tx_pdma(struct mtk_e
  56                         budget--;
  57                 }
  58
  59 -               mtk_tx_unmap(eth, tx_buf);
  60 +               mtk_tx_unmap(eth, tx_buf, true);
  61
  62                 desc = &ring->dma[cpu];
  63                 ring->last_free = desc;
  64 @@ -1612,7 +1617,7 @@ static void mtk_tx_clean(struct mtk_eth
  65
  66         if (ring->buf) {
  67                 for (i = 0; i < MTK_DMA_SIZE; i++)
  68 -                       mtk_tx_unmap(eth, &ring->buf[i]);
  69 +                       mtk_tx_unmap(eth, &ring->buf[i], false);
  70                 kfree(ring->buf);
  71                 ring->buf = NULL;
  72         }