target/linux/generic/backport-5.15/702-v5.19-25-net-ethernet-mtk_eth_soc-rely-on-rxd_size-field-in-m.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Fri, 20 May 2022 20:11:34 +0200
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: rely on rxd_size field in
   4  mtk_rx_alloc/mtk_rx_clean
   5
   6 Remove mtk_rx_dma structure layout dependency in mtk_rx_alloc/mtk_rx_clean.
   7 Initialize to 0 rxd3 and rxd4 in mtk_rx_alloc.
   8 This is a preliminary patch to add mt7986 ethernet support.
   9
  10 Tested-by: Sam Shih <sam.shih@mediatek.com>
  11 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  12 Signed-off-by: David S. Miller <davem@davemloft.net>
  13 ---
  14
  15 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  16 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  17 @@ -1785,18 +1785,25 @@ static int mtk_rx_alloc(struct mtk_eth *
  18                 return -ENOMEM;
  19
  20         for (i = 0; i < rx_dma_size; i++) {
  21 +               struct mtk_rx_dma *rxd;
  22 +
  23                 dma_addr_t dma_addr = dma_map_single(eth->dma_dev,
  24                                 ring->data[i] + NET_SKB_PAD + eth->ip_align,
  25                                 ring->buf_size,
  26                                 DMA_FROM_DEVICE);
  27                 if (unlikely(dma_mapping_error(eth->dma_dev, dma_addr)))
  28                         return -ENOMEM;
  29 -               ring->dma[i].rxd1 = (unsigned int)dma_addr;
  30 +
  31 +               rxd = (void *)ring->dma + i * eth->soc->txrx.rxd_size;
  32 +               rxd->rxd1 = (unsigned int)dma_addr;
  33
  34                 if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
  35 -                       ring->dma[i].rxd2 = RX_DMA_LSO;
  36 +                       rxd->rxd2 = RX_DMA_LSO;
  37                 else
  38 -                       ring->dma[i].rxd2 = RX_DMA_PLEN0(ring->buf_size);
  39 +                       rxd->rxd2 = RX_DMA_PLEN0(ring->buf_size);
  40 +
  41 +               rxd->rxd3 = 0;
  42 +               rxd->rxd4 = 0;
  43         }
  44         ring->dma_size = rx_dma_size;
  45         ring->calc_idx_update = false;
  46 @@ -1821,14 +1828,17 @@ static void mtk_rx_clean(struct mtk_eth
  47
  48         if (ring->data && ring->dma) {
  49                 for (i = 0; i < ring->dma_size; i++) {
  50 +                       struct mtk_rx_dma *rxd;
  51 +
  52                         if (!ring->data[i])
  53                                 continue;
  54 -                       if (!ring->dma[i].rxd1)
  55 +
  56 +                       rxd = (void *)ring->dma + i * eth->soc->txrx.rxd_size;
  57 +                       if (!rxd->rxd1)
  58                                 continue;
  59 -                       dma_unmap_single(eth->dma_dev,
  60 -                                        ring->dma[i].rxd1,
  61 -                                        ring->buf_size,
  62 -                                        DMA_FROM_DEVICE);
  63 +
  64 +                       dma_unmap_single(eth->dma_dev, rxd->rxd1,
  65 +                                        ring->buf_size, DMA_FROM_DEVICE);
  66                         skb_free_frag(ring->data[i]);
  67                 }
  68                 kfree(ring->data);