ipv4: Cache dst in tunnels
Avoid doing a route lookup on every packet being tunneled. In ip_tunnel.c cache the route returned from ip_route_output if the tunnel is "connected" so that all the rouitng parameters are taken from tunnel parms for a packet. Specifically, not NBMA tunnel and tos is from tunnel parms (not inner packet). Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -54,6 +54,9 @@ struct ip_tunnel {
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int hlen; /* Precalculated header length */
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int mlink;
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struct dst_entry __rcu *dst_cache;
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spinlock_t dst_lock;
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struct ip_tunnel_parm parms;
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/* for SIT */
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@ -68,6 +68,54 @@ static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
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IP_TNL_HASH_BITS);
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}
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static inline void __tunnel_dst_set(struct ip_tunnel *t, struct dst_entry *dst)
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{
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struct dst_entry *old_dst;
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if (dst && (dst->flags & DST_NOCACHE))
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dst = NULL;
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spin_lock_bh(&t->dst_lock);
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old_dst = rcu_dereference_raw(t->dst_cache);
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rcu_assign_pointer(t->dst_cache, dst);
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dst_release(old_dst);
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spin_unlock_bh(&t->dst_lock);
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}
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static inline void tunnel_dst_set(struct ip_tunnel *t, struct dst_entry *dst)
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{
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__tunnel_dst_set(t, dst);
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}
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static inline void tunnel_dst_reset(struct ip_tunnel *t)
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{
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tunnel_dst_set(t, NULL);
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}
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static inline struct dst_entry *tunnel_dst_get(struct ip_tunnel *t)
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{
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struct dst_entry *dst;
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rcu_read_lock();
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dst = rcu_dereference(t->dst_cache);
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if (dst)
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dst_hold(dst);
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rcu_read_unlock();
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return dst;
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}
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struct dst_entry *tunnel_dst_check(struct ip_tunnel *t, u32 cookie)
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{
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struct dst_entry *dst = tunnel_dst_get(t);
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if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
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tunnel_dst_reset(t);
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return NULL;
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}
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return dst;
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}
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/* Often modified stats are per cpu, other are shared (netdev->stats) */
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struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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@ -318,11 +366,10 @@ failed:
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return ERR_PTR(err);
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}
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static inline struct rtable *ip_route_output_tunnel(struct net *net,
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struct flowi4 *fl4,
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int proto,
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__be32 daddr, __be32 saddr,
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__be32 key, __u8 tos, int oif)
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static inline void init_tunnel_flow(struct flowi4 *fl4,
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int proto,
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__be32 daddr, __be32 saddr,
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__be32 key, __u8 tos, int oif)
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{
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memset(fl4, 0, sizeof(*fl4));
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fl4->flowi4_oif = oif;
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@ -331,7 +378,6 @@ static inline struct rtable *ip_route_output_tunnel(struct net *net,
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fl4->flowi4_tos = tos;
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fl4->flowi4_proto = proto;
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fl4->fl4_gre_key = key;
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return ip_route_output_key(net, fl4);
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}
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static int ip_tunnel_bind_dev(struct net_device *dev)
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@ -350,14 +396,14 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
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struct flowi4 fl4;
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struct rtable *rt;
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rt = ip_route_output_tunnel(tunnel->net, &fl4,
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tunnel->parms.iph.protocol,
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iph->daddr, iph->saddr,
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tunnel->parms.o_key,
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RT_TOS(iph->tos),
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tunnel->parms.link);
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init_tunnel_flow(&fl4, iph->protocol, iph->daddr,
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iph->saddr, tunnel->parms.o_key,
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RT_TOS(iph->tos), tunnel->parms.link);
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rt = ip_route_output_key(tunnel->net, &fl4);
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if (!IS_ERR(rt)) {
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tdev = rt->dst.dev;
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tunnel_dst_set(tunnel, dst_clone(&rt->dst));
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ip_rt_put(rt);
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}
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if (dev->type != ARPHRD_ETHER)
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@ -528,10 +574,11 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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struct flowi4 fl4;
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u8 tos, ttl;
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__be16 df;
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struct rtable *rt; /* Route to the other host */
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struct rtable *rt = NULL; /* Route to the other host */
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unsigned int max_headroom; /* The extra header space needed */
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__be32 dst;
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int err;
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bool connected = true;
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inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
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@ -581,27 +628,39 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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#endif
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else
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goto tx_error;
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connected = false;
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}
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tos = tnl_params->tos;
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if (tos & 0x1) {
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tos &= ~0x1;
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if (skb->protocol == htons(ETH_P_IP))
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if (skb->protocol == htons(ETH_P_IP)) {
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tos = inner_iph->tos;
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else if (skb->protocol == htons(ETH_P_IPV6))
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connected = false;
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} else if (skb->protocol == htons(ETH_P_IPV6)) {
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tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
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connected = false;
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}
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}
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rt = ip_route_output_tunnel(tunnel->net, &fl4,
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protocol,
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dst, tnl_params->saddr,
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tunnel->parms.o_key,
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RT_TOS(tos),
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tunnel->parms.link);
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if (IS_ERR(rt)) {
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dev->stats.tx_carrier_errors++;
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goto tx_error;
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init_tunnel_flow(&fl4, protocol, dst, tnl_params->saddr,
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tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link);
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if (connected)
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rt = (struct rtable *)tunnel_dst_check(tunnel, 0);
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if (!rt) {
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rt = ip_route_output_key(tunnel->net, &fl4);
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if (IS_ERR(rt)) {
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dev->stats.tx_carrier_errors++;
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goto tx_error;
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}
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if (connected)
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tunnel_dst_set(tunnel, dst_clone(&rt->dst));
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}
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if (rt->dst.dev == dev) {
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ip_rt_put(rt);
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dev->stats.collisions++;
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@ -696,6 +755,7 @@ static void ip_tunnel_update(struct ip_tunnel_net *itn,
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if (set_mtu)
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dev->mtu = mtu;
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}
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tunnel_dst_reset(t);
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netdev_state_change(dev);
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}
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@ -1001,6 +1061,9 @@ int ip_tunnel_init(struct net_device *dev)
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iph->version = 4;
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iph->ihl = 5;
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tunnel->dst_cache = NULL;
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spin_lock_init(&tunnel->dst_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ip_tunnel_init);
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@ -1015,6 +1078,8 @@ void ip_tunnel_uninit(struct net_device *dev)
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/* fb_tunnel_dev will be unregisted in net-exit call. */
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if (itn->fb_tunnel_dev != dev)
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ip_tunnel_del(netdev_priv(dev));
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tunnel_dst_reset(tunnel);
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}
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EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
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