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   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Fri, 20 May 2022 20:11:29 +0200
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: rely on txd_size in
   4  mtk_tx_alloc/mtk_tx_clean
   5
   6 This is a preliminary patch to add mt7986 ethernet support.
   7
   8 Tested-by: Sam Shih <sam.shih@mediatek.com>
   9 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12
  13 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  14 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  15 @@ -1625,8 +1625,10 @@ static int mtk_napi_rx(struct napi_struc
  16
  17  static int mtk_tx_alloc(struct mtk_eth *eth)
  18  {
  19 +       const struct mtk_soc_data *soc = eth->soc;
  20         struct mtk_tx_ring *ring = &eth->tx_ring;
  21 -       int i, sz = sizeof(*ring->dma);
  22 +       int i, sz = soc->txrx.txd_size;
  23 +       struct mtk_tx_dma *txd;
  24
  25         ring->buf = kcalloc(MTK_DMA_SIZE, sizeof(*ring->buf),
  26                                GFP_KERNEL);
  27 @@ -1642,8 +1644,10 @@ static int mtk_tx_alloc(struct mtk_eth *
  28                 int next = (i + 1) % MTK_DMA_SIZE;
  29                 u32 next_ptr = ring->phys + next * sz;
  30
  31 -               ring->dma[i].txd2 = next_ptr;
  32 -               ring->dma[i].txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
  33 +               txd = (void *)ring->dma + i * sz;
  34 +               txd->txd2 = next_ptr;
  35 +               txd->txd3 = TX_DMA_LS0 | TX_DMA_OWNER_CPU;
  36 +               txd->txd4 = 0;
  37         }
  38
  39         /* On MT7688 (PDMA only) this driver uses the ring->dma structs
  40 @@ -1665,7 +1669,7 @@ static int mtk_tx_alloc(struct mtk_eth *
  41         ring->dma_size = MTK_DMA_SIZE;
  42         atomic_set(&ring->free_count, MTK_DMA_SIZE - 2);
  43         ring->next_free = &ring->dma[0];
  44 -       ring->last_free = &ring->dma[MTK_DMA_SIZE - 1];
  45 +       ring->last_free = (void *)txd;
  46         ring->last_free_ptr = (u32)(ring->phys + ((MTK_DMA_SIZE - 1) * sz));
  47         ring->thresh = MAX_SKB_FRAGS;
  48
  49 @@ -1698,6 +1702,7 @@ no_tx_mem:
  50
  51  static void mtk_tx_clean(struct mtk_eth *eth)
  52  {
  53 +       const struct mtk_soc_data *soc = eth->soc;
  54         struct mtk_tx_ring *ring = &eth->tx_ring;
  55         int i;
  56
  57 @@ -1710,17 +1715,15 @@ static void mtk_tx_clean(struct mtk_eth
  58
  59         if (ring->dma) {
  60                 dma_free_coherent(eth->dma_dev,
  61 -                                 MTK_DMA_SIZE * sizeof(*ring->dma),
  62 -                                 ring->dma,
  63 -                                 ring->phys);
  64 +                                 MTK_DMA_SIZE * soc->txrx.txd_size,
  65 +                                 ring->dma, ring->phys);
  66                 ring->dma = NULL;
  67         }
  68
  69         if (ring->dma_pdma) {
  70                 dma_free_coherent(eth->dma_dev,
  71 -                                 MTK_DMA_SIZE * sizeof(*ring->dma_pdma),
  72 -                                 ring->dma_pdma,
  73 -                                 ring->phys_pdma);
  74 +                                 MTK_DMA_SIZE * soc->txrx.txd_size,
  75 +                                 ring->dma_pdma, ring->phys_pdma);
  76                 ring->dma_pdma = NULL;
  77         }
  78  }