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ipip: percpu stats accounting
Maintain per_cpu tx_bytes, tx_packets, rx_bytes, rx_packets. Other seldom used fields are kept in netdev->stats structure, possibly unsafe. This is a preliminary work to support lockless transmit path, and correct RX stats, that are already unsafe. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
e985aad723
commit
3c97af99a5
127
net/ipv4/ipip.c
127
net/ipv4/ipip.c
@ -131,8 +131,9 @@ struct ipip_net {
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struct net_device *fb_tunnel_dev;
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};
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static void ipip_tunnel_init(struct net_device *dev);
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static int ipip_tunnel_init(struct net_device *dev);
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static void ipip_tunnel_setup(struct net_device *dev);
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static void ipip_dev_free(struct net_device *dev);
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/*
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* Locking : hash tables are protected by RCU and RTNL
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@ -141,6 +142,34 @@ static void ipip_tunnel_setup(struct net_device *dev);
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#define for_each_ip_tunnel_rcu(start) \
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for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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/* often modified stats are per cpu, other are shared (netdev->stats) */
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struct pcpu_tstats {
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unsigned long rx_packets;
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unsigned long rx_bytes;
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unsigned long tx_packets;
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unsigned long tx_bytes;
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};
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static struct net_device_stats *ipip_get_stats(struct net_device *dev)
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{
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struct pcpu_tstats sum = { 0 };
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int i;
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for_each_possible_cpu(i) {
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const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
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sum.rx_packets += tstats->rx_packets;
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sum.rx_bytes += tstats->rx_bytes;
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sum.tx_packets += tstats->tx_packets;
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sum.tx_bytes += tstats->tx_bytes;
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}
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dev->stats.rx_packets = sum.rx_packets;
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dev->stats.rx_bytes = sum.rx_bytes;
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dev->stats.tx_packets = sum.tx_packets;
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dev->stats.tx_bytes = sum.tx_bytes;
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return &dev->stats;
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}
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static struct ip_tunnel * ipip_tunnel_lookup(struct net *net,
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__be32 remote, __be32 local)
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{
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@ -239,7 +268,7 @@ static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
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if (parms->name[0])
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strlcpy(name, parms->name, IFNAMSIZ);
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else
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sprintf(name, "tunl%%d");
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strcpy(name, "tunl%d");
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dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
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if (dev == NULL)
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@ -255,7 +284,8 @@ static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
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nt = netdev_priv(dev);
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nt->parms = *parms;
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ipip_tunnel_init(dev);
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if (ipip_tunnel_init(dev) < 0)
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goto failed_free;
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if (register_netdevice(dev) < 0)
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goto failed_free;
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@ -265,7 +295,7 @@ static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
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return nt;
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failed_free:
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free_netdev(dev);
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ipip_dev_free(dev);
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return NULL;
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}
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@ -359,8 +389,10 @@ static int ipip_rcv(struct sk_buff *skb)
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const struct iphdr *iph = ip_hdr(skb);
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rcu_read_lock();
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if ((tunnel = ipip_tunnel_lookup(dev_net(skb->dev),
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iph->saddr, iph->daddr)) != NULL) {
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tunnel = ipip_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
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if (tunnel != NULL) {
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struct pcpu_tstats *tstats;
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if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
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rcu_read_unlock();
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kfree_skb(skb);
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@ -374,7 +406,11 @@ static int ipip_rcv(struct sk_buff *skb)
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skb->protocol = htons(ETH_P_IP);
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skb->pkt_type = PACKET_HOST;
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skb_tunnel_rx(skb, tunnel->dev);
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tstats = this_cpu_ptr(tunnel->dev->tstats);
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tstats->rx_packets++;
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tstats->rx_bytes += skb->len;
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__skb_tunnel_rx(skb, tunnel->dev);
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ipip_ecn_decapsulate(iph, skb);
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@ -397,13 +433,12 @@ static int ipip_rcv(struct sk_buff *skb)
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static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct net_device_stats *stats = &dev->stats;
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struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
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struct pcpu_tstats *tstats;
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struct iphdr *tiph = &tunnel->parms.iph;
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u8 tos = tunnel->parms.iph.tos;
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__be16 df = tiph->frag_off;
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struct rtable *rt; /* Route to the other host */
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struct net_device *tdev; /* Device to other host */
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struct net_device *tdev; /* Device to other host */
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struct iphdr *old_iph = ip_hdr(skb);
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struct iphdr *iph; /* Our new IP header */
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unsigned int max_headroom; /* The extra header space needed */
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@ -413,13 +448,13 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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if (skb->protocol != htons(ETH_P_IP))
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goto tx_error;
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if (tos&1)
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if (tos & 1)
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tos = old_iph->tos;
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if (!dst) {
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/* NBMA tunnel */
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if ((rt = skb_rtable(skb)) == NULL) {
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stats->tx_fifo_errors++;
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dev->stats.tx_fifo_errors++;
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goto tx_error;
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}
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if ((dst = rt->rt_gateway) == 0)
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@ -427,14 +462,20 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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}
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{
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struct flowi fl = { .oif = tunnel->parms.link,
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.nl_u = { .ip4_u =
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{ .daddr = dst,
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.saddr = tiph->saddr,
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.tos = RT_TOS(tos) } },
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.proto = IPPROTO_IPIP };
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struct flowi fl = {
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.oif = tunnel->parms.link,
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.nl_u = {
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.ip4_u = {
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.daddr = dst,
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.saddr = tiph->saddr,
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.tos = RT_TOS(tos)
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}
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},
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.proto = IPPROTO_IPIP
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};
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if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
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stats->tx_carrier_errors++;
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dev->stats.tx_carrier_errors++;
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goto tx_error_icmp;
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}
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}
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@ -442,7 +483,7 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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if (tdev == dev) {
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ip_rt_put(rt);
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stats->collisions++;
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dev->stats.collisions++;
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goto tx_error;
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}
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@ -452,7 +493,7 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
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if (mtu < 68) {
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stats->collisions++;
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dev->stats.collisions++;
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ip_rt_put(rt);
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goto tx_error;
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}
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@ -488,7 +529,7 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
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if (!new_skb) {
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ip_rt_put(rt);
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txq->tx_dropped++;
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dev->stats.tx_dropped++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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@ -525,14 +566,14 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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iph->ttl = old_iph->ttl;
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nf_reset(skb);
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IPTUNNEL_XMIT();
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tstats = this_cpu_ptr(dev->tstats);
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__IPTUNNEL_XMIT(tstats, &dev->stats);
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return NETDEV_TX_OK;
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tx_error_icmp:
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dst_link_failure(skb);
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tx_error:
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stats->tx_errors++;
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dev->stats.tx_errors++;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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@ -547,13 +588,19 @@ static void ipip_tunnel_bind_dev(struct net_device *dev)
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iph = &tunnel->parms.iph;
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if (iph->daddr) {
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struct flowi fl = { .oif = tunnel->parms.link,
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.nl_u = { .ip4_u =
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{ .daddr = iph->daddr,
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.saddr = iph->saddr,
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.tos = RT_TOS(iph->tos) } },
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.proto = IPPROTO_IPIP };
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struct flowi fl = {
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.oif = tunnel->parms.link,
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.nl_u = {
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.ip4_u = {
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.daddr = iph->daddr,
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.saddr = iph->saddr,
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.tos = RT_TOS(iph->tos)
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}
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},
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.proto = IPPROTO_IPIP
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};
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struct rtable *rt;
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if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
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tdev = rt->dst.dev;
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ip_rt_put(rt);
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@ -699,13 +746,19 @@ static const struct net_device_ops ipip_netdev_ops = {
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.ndo_start_xmit = ipip_tunnel_xmit,
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.ndo_do_ioctl = ipip_tunnel_ioctl,
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.ndo_change_mtu = ipip_tunnel_change_mtu,
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.ndo_get_stats = ipip_get_stats,
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};
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static void ipip_dev_free(struct net_device *dev)
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{
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free_percpu(dev->tstats);
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free_netdev(dev);
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}
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static void ipip_tunnel_setup(struct net_device *dev)
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{
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dev->netdev_ops = &ipip_netdev_ops;
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dev->destructor = free_netdev;
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dev->destructor = ipip_dev_free;
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dev->type = ARPHRD_TUNNEL;
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dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
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@ -717,7 +770,7 @@ static void ipip_tunnel_setup(struct net_device *dev)
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dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
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}
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static void ipip_tunnel_init(struct net_device *dev)
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static int ipip_tunnel_init(struct net_device *dev)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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@ -728,6 +781,12 @@ static void ipip_tunnel_init(struct net_device *dev)
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memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
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ipip_tunnel_bind_dev(dev);
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dev->tstats = alloc_percpu(struct pcpu_tstats);
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if (!dev->tstats)
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return -ENOMEM;
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return 0;
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}
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static void __net_init ipip_fb_tunnel_init(struct net_device *dev)
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