diff options
Diffstat (limited to 'target/linux/generic/pending-4.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch')
| -rw-r--r-- | target/linux/generic/pending-4.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/target/linux/generic/pending-4.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch b/target/linux/generic/pending-4.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch deleted file mode 100644 index bfe76db..0000000 --- a/target/linux/generic/pending-4.4/680-NET-skip-GRO-for-foreign-MAC-addresses.patch +++ /dev/null @@ -1,160 +0,0 @@ -Subject: NET: skip GRO for foreign MAC addresses - -For network drivers using napi_gro_receive, packets are run through GRO, -even when the destination MAC address does not match, and they're supposed -to be delivered to another host behind a different bridge port. - -This can be very expensive, because for drivers without TSO or scatter- -gather, this can only be undone by copying the skb and checksumming it -again. - -To be able to track foreign MAC addresses in an inexpensive way, create -a mask of changed bits in MAC addresses of upper devices. This allows -handling VLANs and bridge devices with different addresses (as long as -they are not too different). - -Signed-off-by: Felix Fietkau <nbd@nbd.name> - ---- a/net/core/dev.c -+++ b/net/core/dev.c -@@ -4278,6 +4278,9 @@ static enum gro_result dev_gro_receive(s - enum gro_result ret; - int grow; - -+ if (skb->gro_skip) -+ goto normal; -+ - if (!(skb->dev->features & NETIF_F_GRO)) - goto normal; - -@@ -5444,6 +5447,48 @@ 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 *private) -@@ -5515,6 +5560,7 @@ static int __netdev_upper_dev_link(struc - goto rollback_lower_mesh; - } - -+ netdev_update_addr_mask(dev); - call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, - &changeupper_info.info); - return 0; -@@ -5641,6 +5687,7 @@ void netdev_upper_dev_unlink(struct net_ - list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) - __netdev_adjacent_dev_unlink(dev, i->dev, i->ref_nr); - -+ netdev_update_addr_mask(dev); - call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev, - &changeupper_info.info); - } -@@ -6181,6 +6228,7 @@ 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/include/linux/netdevice.h -+++ b/include/linux/netdevice.h -@@ -1639,6 +1639,8 @@ 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 -@@ -642,7 +642,8 @@ struct sk_buff { - __u8 ipvs_property:1; - __u8 inner_protocol_type:1; - __u8 remcsum_offload:1; -- /* 3 or 5 bit hole */ -+ __u8 gro_skip:1; -+ /* 2 or 4 bit hole */ - - #ifdef CONFIG_NET_SCHED - __u16 tc_index; /* traffic control index */ ---- a/net/ethernet/eth.c -+++ b/net/ethernet/eth.c -@@ -140,6 +140,18 @@ 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 -@@ -168,8 +180,12 @@ __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 |