From: Felix Fietkau Subject: net: replace GRO optimization patch with a new one that supports VLANs/bridges with different MAC addresses Signed-off-by: Felix Fietkau --- include/linux/netdevice.h | 2 ++ include/linux/skbuff.h | 3 ++- net/core/dev.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++ net/ethernet/eth.c | 18 +++++++++++++++++- 4 files changed, 69 insertions(+), 2 deletions(-) --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1771,6 +1771,8 @@ struct net_device { struct netdev_hw_addr_list mc; struct netdev_hw_addr_list dev_addrs; + unsigned char local_addr_mask[MAX_ADDR_LEN]; + #ifdef CONFIG_SYSFS struct kset *queues_kset; #endif --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -782,6 +782,7 @@ struct sk_buff { __u8 tc_redirected:1; __u8 tc_from_ingress:1; #endif + __u8 gro_skip:1; #ifdef CONFIG_NET_SCHED __u16 tc_index; /* traffic control index */ --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4802,6 +4802,9 @@ static enum gro_result dev_gro_receive(s enum gro_result ret; int grow; + if (skb->gro_skip) + goto normal; + if (netif_elide_gro(skb->dev)) goto normal; @@ -6280,6 +6283,48 @@ static void __netdev_adjacent_dev_unlink &upper_dev->adj_list.lower); } +static void __netdev_addr_mask(unsigned char *mask, const unsigned char *addr, + struct net_device *dev) +{ + int i; + + for (i = 0; i < dev->addr_len; i++) + mask[i] |= addr[i] ^ dev->dev_addr[i]; +} + +static void __netdev_upper_mask(unsigned char *mask, struct net_device *dev, + struct net_device *lower) +{ + struct net_device *cur; + struct list_head *iter; + + netdev_for_each_upper_dev_rcu(dev, cur, iter) { + __netdev_addr_mask(mask, cur->dev_addr, lower); + __netdev_upper_mask(mask, cur, lower); + } +} + +static void __netdev_update_addr_mask(struct net_device *dev) +{ + unsigned char mask[MAX_ADDR_LEN]; + struct net_device *cur; + struct list_head *iter; + + memset(mask, 0, sizeof(mask)); + __netdev_upper_mask(mask, dev, dev); + memcpy(dev->local_addr_mask, mask, dev->addr_len); + + netdev_for_each_lower_dev(dev, cur, iter) + __netdev_update_addr_mask(cur); +} + +static void netdev_update_addr_mask(struct net_device *dev) +{ + rcu_read_lock(); + __netdev_update_addr_mask(dev); + rcu_read_unlock(); +} + static int __netdev_upper_dev_link(struct net_device *dev, struct net_device *upper_dev, bool master, void *upper_priv, void *upper_info) @@ -6318,6 +6363,7 @@ static int __netdev_upper_dev_link(struc if (ret) return ret; + netdev_update_addr_mask(dev); ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, &changeupper_info.info); ret = notifier_to_errno(ret); @@ -6395,6 +6441,7 @@ void netdev_upper_dev_unlink(struct net_ __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); + netdev_update_addr_mask(dev); call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, &changeupper_info.info); } @@ -6959,6 +7006,7 @@ int dev_set_mac_address(struct net_devic if (err) return err; dev->addr_assign_type = NET_ADDR_SET; + netdev_update_addr_mask(dev); call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); add_device_randomness(dev->dev_addr, dev->addr_len); return 0; --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -144,6 +144,18 @@ u32 eth_get_headlen(void *data, unsigned } EXPORT_SYMBOL(eth_get_headlen); +static inline bool +eth_check_local_mask(const void *addr1, const void *addr2, const void *mask) +{ + const u16 *a1 = addr1; + const u16 *a2 = addr2; + const u16 *m = mask; + + return (((a1[0] ^ a2[0]) & ~m[0]) | + ((a1[1] ^ a2[1]) & ~m[1]) | + ((a1[2] ^ a2[2]) & ~m[2])); +} + /** * eth_type_trans - determine the packet's protocol ID. * @skb: received socket data @@ -172,8 +184,12 @@ __be16 eth_type_trans(struct sk_buff *sk skb->pkt_type = PACKET_MULTICAST; } else if (unlikely(!ether_addr_equal_64bits(eth->h_dest, - dev->dev_addr))) + dev->dev_addr))) { skb->pkt_type = PACKET_OTHERHOST; + if (eth_check_local_mask(eth->h_dest, dev->dev_addr, + dev->local_addr_mask)) + skb->gro_skip = 1; + } /* * Some variants of DSA tagging don't have an ethertype field