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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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sit: 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
3c97af99a5
commit
15fc1f7056
@ -63,8 +63,9 @@
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#define HASH_SIZE 16
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#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
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static void ipip6_tunnel_init(struct net_device *dev);
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static int ipip6_tunnel_init(struct net_device *dev);
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static void ipip6_tunnel_setup(struct net_device *dev);
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static void ipip6_dev_free(struct net_device *dev);
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static int sit_net_id __read_mostly;
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struct sit_net {
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@ -84,6 +85,33 @@ struct sit_net {
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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 *ipip6_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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/*
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* Must be invoked with rcu_read_lock
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*/
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@ -214,7 +242,7 @@ static struct ip_tunnel *ipip6_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, "sit%%d");
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strcpy(name, "sit%d");
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dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
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if (dev == NULL)
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@ -230,7 +258,8 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
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nt = netdev_priv(dev);
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nt->parms = *parms;
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ipip6_tunnel_init(dev);
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if (ipip6_tunnel_init(dev) < 0)
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goto failed_free;
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ipip6_tunnel_clone_6rd(dev, sitn);
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if (parms->i_flags & SIT_ISATAP)
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@ -245,7 +274,7 @@ static struct ip_tunnel *ipip6_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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ipip6_dev_free(dev);
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failed:
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return NULL;
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}
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@ -546,6 +575,8 @@ static int ipip6_rcv(struct sk_buff *skb)
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tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
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iph->saddr, iph->daddr);
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if (tunnel != NULL) {
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struct pcpu_tstats *tstats;
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secpath_reset(skb);
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skb->mac_header = skb->network_header;
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skb_reset_network_header(skb);
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@ -561,7 +592,11 @@ static int ipip6_rcv(struct sk_buff *skb)
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return 0;
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}
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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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ipip6_ecn_decapsulate(iph, skb);
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@ -626,14 +661,13 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
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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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struct ipv6hdr *iph6 = ipv6_hdr(skb);
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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 *iph; /* Our new IP header */
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unsigned int max_headroom; /* The extra header space needed */
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__be32 dst = tiph->daddr;
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@ -704,20 +738,20 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
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.oif = tunnel->parms.link,
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.proto = IPPROTO_IPV6 };
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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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if (rt->rt_type != RTN_UNICAST) {
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ip_rt_put(rt);
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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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tdev = rt->dst.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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@ -725,7 +759,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
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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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@ -764,7 +798,7 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
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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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@ -800,14 +834,14 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
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iph->ttl = iph6->hop_limit;
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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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@ -1084,12 +1118,19 @@ static const struct net_device_ops ipip6_netdev_ops = {
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.ndo_start_xmit = ipip6_tunnel_xmit,
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.ndo_do_ioctl = ipip6_tunnel_ioctl,
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.ndo_change_mtu = ipip6_tunnel_change_mtu,
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.ndo_get_stats = ipip6_get_stats,
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};
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static void ipip6_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 ipip6_tunnel_setup(struct net_device *dev)
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{
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dev->netdev_ops = &ipip6_netdev_ops;
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dev->destructor = free_netdev;
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dev->destructor = ipip6_dev_free;
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dev->type = ARPHRD_SIT;
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dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
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@ -1101,7 +1142,7 @@ static void ipip6_tunnel_setup(struct net_device *dev)
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dev->features |= NETIF_F_NETNS_LOCAL;
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}
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static void ipip6_tunnel_init(struct net_device *dev)
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static int ipip6_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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@ -1112,6 +1153,11 @@ static void ipip6_tunnel_init(struct net_device *dev)
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memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
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ipip6_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 ipip6_fb_tunnel_init(struct net_device *dev)
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