target/linux/generic/pending-4.14/680-NET-skip-GRO-for-foreign-MAC-addresses.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Subject: net: replace GRO optimization patch with a new one that supports VLANs/bridges with different MAC addresses
   3
   4 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   5 ---
   6  include/linux/netdevice.h |  2 ++
   7  include/linux/skbuff.h    |  3 ++-
   8  net/core/dev.c            | 48 +++++++++++++++++++++++++++++++++++++++++++++++
   9  net/ethernet/eth.c        | 18 +++++++++++++++++-
  10  4 files changed, 69 insertions(+), 2 deletions(-)
  11
  12 --- a/include/linux/netdevice.h
  13 +++ b/include/linux/netdevice.h
  14 @@ -1752,6 +1752,8 @@ struct net_device {
  15         struct netdev_hw_addr_list      mc;
  16         struct netdev_hw_addr_list      dev_addrs;
  17
  18 +       unsigned char           local_addr_mask[MAX_ADDR_LEN];
  19 +
  20  #ifdef CONFIG_SYSFS
  21         struct kset             *queues_kset;
  22  #endif
  23 --- a/include/linux/skbuff.h
  24 +++ b/include/linux/skbuff.h
  25 @@ -780,6 +780,7 @@ struct sk_buff {
  26         __u8                    tc_redirected:1;
  27         __u8                    tc_from_ingress:1;
  28  #endif
  29 +       __u8                    gro_skip:1;
  30
  31  #ifdef CONFIG_NET_SCHED
  32         __u16                   tc_index;       /* traffic control index */
  33 --- a/net/core/dev.c
  34 +++ b/net/core/dev.c
  35 @@ -4768,6 +4768,9 @@ static enum gro_result dev_gro_receive(s
  36         enum gro_result ret;
  37         int grow;
  38
  39 +       if (skb->gro_skip)
  40 +               goto normal;
  41 +
  42         if (netif_elide_gro(skb->dev))
  43                 goto normal;
  44
  45 @@ -6238,6 +6241,48 @@ static void __netdev_adjacent_dev_unlink
  46                                            &upper_dev->adj_list.lower);
  47  }
  48
  49 +static void __netdev_addr_mask(unsigned char *mask, const unsigned char *addr,
  50 +                              struct net_device *dev)
  51 +{
  52 +       int i;
  53 +
  54 +       for (i = 0; i < dev->addr_len; i++)
  55 +               mask[i] |= addr[i] ^ dev->dev_addr[i];
  56 +}
  57 +
  58 +static void __netdev_upper_mask(unsigned char *mask, struct net_device *dev,
  59 +                               struct net_device *lower)
  60 +{
  61 +       struct net_device *cur;
  62 +       struct list_head *iter;
  63 +
  64 +       netdev_for_each_upper_dev_rcu(dev, cur, iter) {
  65 +               __netdev_addr_mask(mask, cur->dev_addr, lower);
  66 +               __netdev_upper_mask(mask, cur, lower);
  67 +       }
  68 +}
  69 +
  70 +static void __netdev_update_addr_mask(struct net_device *dev)
  71 +{
  72 +       unsigned char mask[MAX_ADDR_LEN];
  73 +       struct net_device *cur;
  74 +       struct list_head *iter;
  75 +
  76 +       memset(mask, 0, sizeof(mask));
  77 +       __netdev_upper_mask(mask, dev, dev);
  78 +       memcpy(dev->local_addr_mask, mask, dev->addr_len);
  79 +
  80 +       netdev_for_each_lower_dev(dev, cur, iter)
  81 +               __netdev_update_addr_mask(cur);
  82 +}
  83 +
  84 +static void netdev_update_addr_mask(struct net_device *dev)
  85 +{
  86 +       rcu_read_lock();
  87 +       __netdev_update_addr_mask(dev);
  88 +       rcu_read_unlock();
  89 +}
  90 +
  91  static int __netdev_upper_dev_link(struct net_device *dev,
  92                                    struct net_device *upper_dev, bool master,
  93                                    void *upper_priv, void *upper_info)
  94 @@ -6353,6 +6398,8 @@ void netdev_upper_dev_unlink(struct net_
  95
  96         __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
  97
  98 +       netdev_update_addr_mask(dev);
  99 +       netdev_update_addr_mask(dev);
 100         call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
 101                                       &changeupper_info.info);
 102  }
 103 @@ -6923,6 +6970,7 @@ int dev_set_mac_address(struct net_devic
 104         if (err)
 105                 return err;
 106         dev->addr_assign_type = NET_ADDR_SET;
 107 +       netdev_update_addr_mask(dev);
 108         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 109         add_device_randomness(dev->dev_addr, dev->addr_len);
 110         return 0;
 111 --- a/net/ethernet/eth.c
 112 +++ b/net/ethernet/eth.c
 113 @@ -144,6 +144,18 @@ u32 eth_get_headlen(void *data, unsigned
 114  }
 115  EXPORT_SYMBOL(eth_get_headlen);
 116
 117 +static inline bool
 118 +eth_check_local_mask(const void *addr1, const void *addr2, const void *mask)
 119 +{
 120 +       const u16 *a1 = addr1;
 121 +       const u16 *a2 = addr2;
 122 +       const u16 *m = mask;
 123 +
 124 +       return (((a1[0] ^ a2[0]) & ~m[0]) |
 125 +               ((a1[1] ^ a2[1]) & ~m[1]) |
 126 +               ((a1[2] ^ a2[2]) & ~m[2]));
 127 +}
 128 +
 129  /**
 130   * eth_type_trans - determine the packet's protocol ID.
 131   * @skb: received socket data
 132 @@ -172,8 +184,12 @@ __be16 eth_type_trans(struct sk_buff *sk
 133                         skb->pkt_type = PACKET_MULTICAST;
 134         }
 135         else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
 136 -                                                  dev->dev_addr)))
 137 +                                                  dev->dev_addr))) {
 138                 skb->pkt_type = PACKET_OTHERHOST;
 139 +               if (eth_check_local_mask(eth->h_dest, dev->dev_addr,
 140 +                                        dev->local_addr_mask))
 141 +                       skb->gro_skip = 1;
 142 +       }
 143
 144         /*
 145          * Some variants of DSA tagging don't have an ethertype field