161 lines
4.5 KiB
Diff
161 lines
4.5 KiB
Diff
Subject: NET: skip GRO for foreign MAC addresses
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For network drivers using napi_gro_receive, packets are run through GRO,
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even when the destination MAC address does not match, and they're supposed
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to be delivered to another host behind a different bridge port.
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This can be very expensive, because for drivers without TSO or scatter-
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gather, this can only be undone by copying the skb and checksumming it
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again.
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To be able to track foreign MAC addresses in an inexpensive way, create
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a mask of changed bits in MAC addresses of upper devices. This allows
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handling VLANs and bridge devices with different addresses (as long as
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they are not too different).
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -4041,6 +4041,9 @@ static enum gro_result dev_gro_receive(s
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enum gro_result ret;
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int grow;
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+ if (skb->gro_skip)
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+ goto normal;
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+
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if (!(skb->dev->features & NETIF_F_GRO))
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goto normal;
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@@ -5190,6 +5193,48 @@ static void __netdev_adjacent_dev_unlink
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&upper_dev->adj_list.lower);
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}
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+static void __netdev_addr_mask(unsigned char *mask, const unsigned char *addr,
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+ struct net_device *dev)
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+{
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+ int i;
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+
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+ for (i = 0; i < dev->addr_len; i++)
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+ mask[i] |= addr[i] ^ dev->dev_addr[i];
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+}
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+
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+static void __netdev_upper_mask(unsigned char *mask, struct net_device *dev,
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+ struct net_device *lower)
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+{
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+ struct net_device *cur;
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+ struct list_head *iter;
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+
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+ netdev_for_each_upper_dev_rcu(dev, cur, iter) {
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+ __netdev_addr_mask(mask, cur->dev_addr, lower);
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+ __netdev_upper_mask(mask, cur, lower);
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+ }
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+}
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+
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+static void __netdev_update_addr_mask(struct net_device *dev)
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+{
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+ unsigned char mask[MAX_ADDR_LEN];
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+ struct net_device *cur;
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+ struct list_head *iter;
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+
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+ memset(mask, 0, sizeof(mask));
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+ __netdev_upper_mask(mask, dev, dev);
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+ memcpy(dev->local_addr_mask, mask, dev->addr_len);
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+
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+ netdev_for_each_lower_dev(dev, cur, iter)
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+ __netdev_update_addr_mask(cur);
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+}
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+
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+static void netdev_update_addr_mask(struct net_device *dev)
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+{
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+ rcu_read_lock();
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+ __netdev_update_addr_mask(dev);
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+ rcu_read_unlock();
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+}
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+
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static int __netdev_upper_dev_link(struct net_device *dev,
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struct net_device *upper_dev, bool master,
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void *private)
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@@ -5250,6 +5295,7 @@ static int __netdev_upper_dev_link(struc
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goto rollback_lower_mesh;
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}
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+ netdev_update_addr_mask(dev);
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call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
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return 0;
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@@ -5367,6 +5413,7 @@ void netdev_upper_dev_unlink(struct net_
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list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
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__netdev_adjacent_dev_unlink(dev, i->dev);
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+ netdev_update_addr_mask(dev);
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call_netdevice_notifiers(NETDEV_CHANGEUPPER, dev);
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}
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EXPORT_SYMBOL(netdev_upper_dev_unlink);
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@@ -5906,6 +5953,7 @@ int dev_set_mac_address(struct net_devic
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if (err)
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return err;
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dev->addr_assign_type = NET_ADDR_SET;
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+ netdev_update_addr_mask(dev);
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call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
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add_device_randomness(dev->dev_addr, dev->addr_len);
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return 0;
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--- a/include/linux/netdevice.h
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+++ b/include/linux/netdevice.h
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@@ -1602,6 +1602,8 @@ struct net_device {
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struct netdev_hw_addr_list mc;
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struct netdev_hw_addr_list dev_addrs;
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+ unsigned char local_addr_mask[MAX_ADDR_LEN];
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+
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#ifdef CONFIG_SYSFS
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struct kset *queues_kset;
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#endif
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -616,7 +616,8 @@ struct sk_buff {
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__u8 ipvs_property:1;
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__u8 inner_protocol_type:1;
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__u8 remcsum_offload:1;
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- /* 3 or 5 bit hole */
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+ __u8 gro_skip:1;
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+ /* 2 or 4 bit hole */
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#ifdef CONFIG_NET_SCHED
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__u16 tc_index; /* traffic control index */
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--- a/net/ethernet/eth.c
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+++ b/net/ethernet/eth.c
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@@ -139,6 +139,18 @@ u32 eth_get_headlen(void *data, unsigned
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}
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EXPORT_SYMBOL(eth_get_headlen);
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+static inline bool
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+eth_check_local_mask(const void *addr1, const void *addr2, const void *mask)
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+{
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+ const u16 *a1 = addr1;
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+ const u16 *a2 = addr2;
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+ const u16 *m = mask;
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+
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+ return (((a1[0] ^ a2[0]) & ~m[0]) |
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+ ((a1[1] ^ a2[1]) & ~m[1]) |
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+ ((a1[2] ^ a2[2]) & ~m[2]));
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+}
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+
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/**
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* eth_type_trans - determine the packet's protocol ID.
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* @skb: received socket data
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@@ -166,8 +178,12 @@ __be16 eth_type_trans(struct sk_buff *sk
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skb->pkt_type = PACKET_MULTICAST;
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}
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else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
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- dev->dev_addr)))
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+ dev->dev_addr))) {
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skb->pkt_type = PACKET_OTHERHOST;
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+ if (eth_check_local_mask(eth->h_dest, dev->dev_addr,
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+ dev->local_addr_mask))
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+ skb->gro_skip = 1;
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+ }
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/*
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* Some variants of DSA tagging don't have an ethertype field
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