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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Sun, 20 Nov 2022 23:01:00 +0100
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: drop generic vlan rx offload,
   4  only use DSA untagging
   5
   6 Through testing I found out that hardware vlan rx offload support seems to
   7 have some hardware issues. At least when using multiple MACs and when receiving
   8 tagged packets on the secondary MAC, the hardware can sometimes start to emit
   9 wrong tags on the first MAC as well.
  10
  11 In order to avoid such issues, drop the feature configuration and use the
  12 offload feature only for DSA hardware untagging on MT7621/MT7622 devices which
  13 only use one MAC.
  14
  15 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  16 ---
  17
  18 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  19 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  20 @@ -1898,9 +1898,7 @@ static int mtk_poll_rx(struct napi_struc
  21
  22         while (done < budget) {
  23                 unsigned int pktlen, *rxdcsum;
  24 -               bool has_hwaccel_tag = false;
  25                 struct net_device *netdev;
  26 -               u16 vlan_proto, vlan_tci;
  27                 dma_addr_t dma_addr;
  28                 u32 hash, reason;
  29                 int mac = 0;
  30 @@ -2035,36 +2033,21 @@ static int mtk_poll_rx(struct napi_struc
  31                         skb_checksum_none_assert(skb);
  32                 skb->protocol = eth_type_trans(skb, netdev);
  33
  34 -               if (reason == MTK_PPE_CPU_REASON_HIT_UNBIND_RATE_REACHED)
  35 -                       mtk_ppe_check_skb(eth->ppe[0], skb, hash);
  36 -
  37 -               if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX) {
  38 -                       if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
  39 -                               if (trxd.rxd3 & RX_DMA_VTAG_V2) {
  40 -                                       vlan_proto = RX_DMA_VPID(trxd.rxd4);
  41 -                                       vlan_tci = RX_DMA_VID(trxd.rxd4);
  42 -                                       has_hwaccel_tag = true;
  43 -                               }
  44 -                       } else if (trxd.rxd2 & RX_DMA_VTAG) {
  45 -                               vlan_proto = RX_DMA_VPID(trxd.rxd3);
  46 -                               vlan_tci = RX_DMA_VID(trxd.rxd3);
  47 -                               has_hwaccel_tag = true;
  48 -                       }
  49 -               }
  50 -
  51                 /* When using VLAN untagging in combination with DSA, the
  52                  * hardware treats the MTK special tag as a VLAN and untags it.
  53                  */
  54 -               if (has_hwaccel_tag && netdev_uses_dsa(netdev)) {
  55 -                       unsigned int port = vlan_proto & GENMASK(2, 0);
  56 +               if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2) &&
  57 +                   (trxd.rxd2 & RX_DMA_VTAG) && netdev_uses_dsa(netdev)) {
  58 +                       unsigned int port = RX_DMA_VPID(trxd.rxd3) & GENMASK(2, 0);
  59
  60                         if (port < ARRAY_SIZE(eth->dsa_meta) &&
  61                             eth->dsa_meta[port])
  62                                 skb_dst_set_noref(skb, &eth->dsa_meta[port]->dst);
  63 -               } else if (has_hwaccel_tag) {
  64 -                       __vlan_hwaccel_put_tag(skb, htons(vlan_proto), vlan_tci);
  65                 }
  66
  67 +               if (reason == MTK_PPE_CPU_REASON_HIT_UNBIND_RATE_REACHED)
  68 +                       mtk_ppe_check_skb(eth->ppe[0], skb, hash);
  69 +
  70                 skb_record_rx_queue(skb, 0);
  71                 napi_gro_receive(napi, skb);
  72
  73 @@ -2890,29 +2873,11 @@ static netdev_features_t mtk_fix_feature
  74
  75  static int mtk_set_features(struct net_device *dev, netdev_features_t features)
  76  {
  77 -       struct mtk_mac *mac = netdev_priv(dev);
  78 -       struct mtk_eth *eth = mac->hw;
  79         netdev_features_t diff = dev->features ^ features;
  80 -       int i;
  81
  82         if ((diff & NETIF_F_LRO) && !(features & NETIF_F_LRO))
  83                 mtk_hwlro_netdev_disable(dev);
  84
  85 -       /* Set RX VLAN offloading */
  86 -       if (!(diff & NETIF_F_HW_VLAN_CTAG_RX))
  87 -               return 0;
  88 -
  89 -       mtk_w32(eth, !!(features & NETIF_F_HW_VLAN_CTAG_RX),
  90 -               MTK_CDMP_EG_CTRL);
  91 -
  92 -       /* sync features with other MAC */
  93 -       for (i = 0; i < MTK_MAC_COUNT; i++) {
  94 -               if (!eth->netdev[i] || eth->netdev[i] == dev)
  95 -                       continue;
  96 -               eth->netdev[i]->features &= ~NETIF_F_HW_VLAN_CTAG_RX;
  97 -               eth->netdev[i]->features |= features & NETIF_F_HW_VLAN_CTAG_RX;
  98 -       }
  99 -
 100         return 0;
 101  }
 102
 103 @@ -3226,30 +3191,6 @@ static int mtk_open(struct net_device *d
 104         struct mtk_eth *eth = mac->hw;
 105         int i, err;
 106
 107 -       if (mtk_uses_dsa(dev) && !eth->prog) {
 108 -               for (i = 0; i < ARRAY_SIZE(eth->dsa_meta); i++) {
 109 -                       struct metadata_dst *md_dst = eth->dsa_meta[i];
 110 -
 111 -                       if (md_dst)
 112 -                               continue;
 113 -
 114 -                       md_dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
 115 -                                                   GFP_KERNEL);
 116 -                       if (!md_dst)
 117 -                               return -ENOMEM;
 118 -
 119 -                       md_dst->u.port_info.port_id = i;
 120 -                       eth->dsa_meta[i] = md_dst;
 121 -               }
 122 -       } else {
 123 -               /* Hardware special tag parsing needs to be disabled if at least
 124 -                * one MAC does not use DSA.
 125 -                */
 126 -               u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
 127 -               val &= ~MTK_CDMP_STAG_EN;
 128 -               mtk_w32(eth, val, MTK_CDMP_IG_CTRL);
 129 -       }
 130 -
 131         err = phylink_of_phy_connect(mac->phylink, mac->of_node, 0);
 132         if (err) {
 133                 netdev_err(dev, "%s: could not attach PHY: %d\n", __func__,
 134 @@ -3288,6 +3229,35 @@ static int mtk_open(struct net_device *d
 135         phylink_start(mac->phylink);
 136         netif_tx_start_all_queues(dev);
 137
 138 +       if (MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2))
 139 +               return 0;
 140 +
 141 +       if (mtk_uses_dsa(dev) && !eth->prog) {
 142 +               for (i = 0; i < ARRAY_SIZE(eth->dsa_meta); i++) {
 143 +                       struct metadata_dst *md_dst = eth->dsa_meta[i];
 144 +
 145 +                       if (md_dst)
 146 +                               continue;
 147 +
 148 +                       md_dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
 149 +                                                   GFP_KERNEL);
 150 +                       if (!md_dst)
 151 +                               return -ENOMEM;
 152 +
 153 +                       md_dst->u.port_info.port_id = i;
 154 +                       eth->dsa_meta[i] = md_dst;
 155 +               }
 156 +       } else {
 157 +               /* Hardware special tag parsing needs to be disabled if at least
 158 +                * one MAC does not use DSA.
 159 +                */
 160 +               u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
 161 +               val &= ~MTK_CDMP_STAG_EN;
 162 +               mtk_w32(eth, val, MTK_CDMP_IG_CTRL);
 163 +
 164 +               mtk_w32(eth, 0, MTK_CDMP_EG_CTRL);
 165 +       }
 166 +
 167         return 0;
 168  }
 169
 170 @@ -3772,10 +3742,9 @@ static int mtk_hw_init(struct mtk_eth *e
 171         if (!MTK_HAS_CAPS(eth->soc->caps, MTK_NETSYS_V2)) {
 172                 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
 173                 mtk_w32(eth, val | MTK_CDMP_STAG_EN, MTK_CDMP_IG_CTRL);
 174 -       }
 175
 176 -       /* Enable RX VLan Offloading */
 177 -       mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
 178 +               mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
 179 +       }
 180
 181         /* set interrupt delays based on current Net DIM sample */
 182         mtk_dim_rx(&eth->rx_dim.work);
 183 @@ -4415,7 +4384,7 @@ static int mtk_add_mac(struct mtk_eth *e
 184                 eth->netdev[id]->hw_features |= NETIF_F_LRO;
 185
 186         eth->netdev[id]->vlan_features = eth->soc->hw_features &
 187 -               ~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX);
 188 +               ~NETIF_F_HW_VLAN_CTAG_TX;
 189         eth->netdev[id]->features |= eth->soc->hw_features;
 190         eth->netdev[id]->ethtool_ops = &mtk_ethtool_ops;
 191
 192 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
 193 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
 194 @@ -48,7 +48,6 @@
 195  #define MTK_HW_FEATURES                (NETIF_F_IP_CSUM | \
 196                                  NETIF_F_RXCSUM | \
 197                                  NETIF_F_HW_VLAN_CTAG_TX | \
 198 -                                NETIF_F_HW_VLAN_CTAG_RX | \
 199                                  NETIF_F_SG | NETIF_F_TSO | \
 200                                  NETIF_F_TSO6 | \
 201                                  NETIF_F_IPV6_CSUM |\