Commit e985aad7 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ip_gre: percpu stats accounting 



Le lundi 27 septembre 2010 à 14:29 +0100, Ben Hutchings a écrit :

> > diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> > index 5d6ddcb..de39b22 100644
> > --- a/net/ipv4/ip_gre.c
> > +++ b/net/ipv4/ip_gre.c
> [...]
> > @@ -377,7 +405,7 @@ static struct ip_tunnel *ipgre_tunnel_locate(struct net *net,
> >  	if (parms->name[0])
> >  		strlcpy(name, parms->name, IFNAMSIZ);
> >  	else
> > -		sprintf(name, "gre%%d");
> > +		strcpy(name, "gre%d");
> >
> >  	dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
> >  	if (!dev)
> [...]
>
> This is a valid fix, but doesn't belong in this patch!
>

Sorry ? It was not a fix, but at most a cleanup ;)

Anyway I forgot the gretap case...

[PATCH 2/4 v2] ip_gre: 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: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 290b895e

net/ipv4/ip_gre.c

+104 −39
Original line number Diff line number Diff line
@@ -165,6 +165,34 @@ struct ipgre_net { 
#define for_each_ip_tunnel_rcu(start) \

	for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))



/* often modified stats are per cpu, other are shared (netdev->stats) */

struct pcpu_tstats {

	unsigned long	rx_packets;

	unsigned long	rx_bytes;

	unsigned long	tx_packets;

	unsigned long	tx_bytes;

};



static struct net_device_stats *ipgre_get_stats(struct net_device *dev)

{

	struct pcpu_tstats sum = { 0 };

	int i;



	for_each_possible_cpu(i) {

		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);



		sum.rx_packets += tstats->rx_packets;

		sum.rx_bytes   += tstats->rx_bytes;

		sum.tx_packets += tstats->tx_packets;

		sum.tx_bytes   += tstats->tx_bytes;

	}

	dev->stats.rx_packets = sum.rx_packets;

	dev->stats.rx_bytes   = sum.rx_bytes;

	dev->stats.tx_packets = sum.tx_packets;

	dev->stats.tx_bytes   = sum.tx_bytes;

	return &dev->stats;

}



/* Given src, dst and key, find appropriate for input tunnel. */



static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
@@ -584,7 +612,7 @@ static int ipgre_rcv(struct sk_buff *skb) 
	if ((tunnel = ipgre_tunnel_lookup(skb->dev,

					  iph->saddr, iph->daddr, key,

					  gre_proto))) {

		struct net_device_stats *stats = &tunnel->dev->stats;

		struct pcpu_tstats *tstats;



		secpath_reset(skb);
@@ -608,22 +636,22 @@ static int ipgre_rcv(struct sk_buff *skb) 
			/* Looped back packet, drop it! */

			if (skb_rtable(skb)->fl.iif == 0)

				goto drop;

			stats->multicast++;

			tunnel->dev->stats.multicast++;

			skb->pkt_type = PACKET_BROADCAST;

		}

#endif



		if (((flags&GRE_CSUM) && csum) ||

		    (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {

			stats->rx_crc_errors++;

			stats->rx_errors++;

			tunnel->dev->stats.rx_crc_errors++;

			tunnel->dev->stats.rx_errors++;

			goto drop;

		}

		if (tunnel->parms.i_flags&GRE_SEQ) {

			if (!(flags&GRE_SEQ) ||

			    (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) {

				stats->rx_fifo_errors++;

				stats->rx_errors++;

				tunnel->dev->stats.rx_fifo_errors++;

				tunnel->dev->stats.rx_errors++;

				goto drop;

			}

			tunnel->i_seqno = seqno + 1;
@@ -632,8 +660,8 @@ static int ipgre_rcv(struct sk_buff *skb) 
		/* Warning: All skb pointers will be invalidated! */

		if (tunnel->dev->type == ARPHRD_ETHER) {

			if (!pskb_may_pull(skb, ETH_HLEN)) {

				stats->rx_length_errors++;

				stats->rx_errors++;

				tunnel->dev->stats.rx_length_errors++;

				tunnel->dev->stats.rx_errors++;

				goto drop;

			}
@@ -642,13 +670,17 @@ static int ipgre_rcv(struct sk_buff *skb) 
			skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);

		}



		skb_tunnel_rx(skb, tunnel->dev);

		tstats = this_cpu_ptr(tunnel->dev->tstats);

		tstats->rx_packets++;

		tstats->rx_bytes += skb->len;



		__skb_tunnel_rx(skb, tunnel->dev);



		skb_reset_network_header(skb);

		ipgre_ecn_decapsulate(iph, skb);



		if (netif_rx(skb) == NET_RX_DROP)

			stats->rx_dropped++;

			tunnel->dev->stats.rx_dropped++;



		rcu_read_unlock();

		return 0;
@@ -665,8 +697,7 @@ drop_nolock: 
static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct ip_tunnel *tunnel = netdev_priv(dev);

	struct net_device_stats *stats = &dev->stats;

	struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);

	struct pcpu_tstats *tstats;

	struct iphdr  *old_iph = ip_hdr(skb);

	struct iphdr  *tiph;

	u8     tos;
@@ -694,7 +725,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev 
		/* NBMA tunnel */



		if (skb_dst(skb) == NULL) {

			stats->tx_fifo_errors++;

			dev->stats.tx_fifo_errors++;

			goto tx_error;

		}
@@ -740,14 +771,20 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev 
	}



	{

		struct flowi fl = { .oif = tunnel->parms.link,

				    .nl_u = { .ip4_u =

					      { .daddr = dst,

		struct flowi fl = {

			.oif = tunnel->parms.link,

			.nl_u = {

				.ip4_u = {

					.daddr = dst,

					.saddr = tiph->saddr,

						.tos = RT_TOS(tos) } },

				    .proto = IPPROTO_GRE };

					.tos = RT_TOS(tos)

				}

			},

			.proto = IPPROTO_GRE

		}

;

		if (ip_route_output_key(dev_net(dev), &rt, &fl)) {

			stats->tx_carrier_errors++;

			dev->stats.tx_carrier_errors++;

			goto tx_error;

		}

	}
@@ -755,7 +792,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev 


	if (tdev == dev) {

		ip_rt_put(rt);

		stats->collisions++;

		dev->stats.collisions++;

		goto tx_error;

	}
@@ -818,7 +855,7 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev 
			dev->needed_headroom = max_headroom;

		if (!new_skb) {

			ip_rt_put(rt);

			txq->tx_dropped++;

			dev->stats.tx_dropped++;

			dev_kfree_skb(skb);

			return NETDEV_TX_OK;

		}
@@ -885,15 +922,15 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev 
	}



	nf_reset(skb);



	IPTUNNEL_XMIT();

	tstats = this_cpu_ptr(dev->tstats);

	__IPTUNNEL_XMIT(tstats, &dev->stats);

	return NETDEV_TX_OK;



tx_error_icmp:

	dst_link_failure(skb);



tx_error:

	stats->tx_errors++;

	dev->stats.tx_errors++;

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;

}
@@ -913,13 +950,19 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev) 
	/* Guess output device to choose reasonable mtu and needed_headroom */



	if (iph->daddr) {

		struct flowi fl = { .oif = tunnel->parms.link,

				    .nl_u = { .ip4_u =

					      { .daddr = iph->daddr,

		struct flowi fl = {

			.oif = tunnel->parms.link,

			.nl_u = {

				.ip4_u = {

					.daddr = iph->daddr,

					.saddr = iph->saddr,

						.tos = RT_TOS(iph->tos) } },

				    .proto = IPPROTO_GRE };

					.tos = RT_TOS(iph->tos)

				}

			},

			.proto = IPPROTO_GRE

		};

		struct rtable *rt;



		if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {

			tdev = rt->dst.dev;

			ip_rt_put(rt);
@@ -1171,13 +1214,19 @@ static int ipgre_open(struct net_device *dev) 
	struct ip_tunnel *t = netdev_priv(dev);



	if (ipv4_is_multicast(t->parms.iph.daddr)) {

		struct flowi fl = { .oif = t->parms.link,

				    .nl_u = { .ip4_u =

					      { .daddr = t->parms.iph.daddr,

		struct flowi fl = {

			.oif = t->parms.link,

			.nl_u = {

				.ip4_u = {

					.daddr = t->parms.iph.daddr,

					.saddr = t->parms.iph.saddr,

						.tos = RT_TOS(t->parms.iph.tos) } },

				    .proto = IPPROTO_GRE };

					.tos = RT_TOS(t->parms.iph.tos)

				}

			},

			.proto = IPPROTO_GRE

		};

		struct rtable *rt;



		if (ip_route_output_key(dev_net(dev), &rt, &fl))

			return -EADDRNOTAVAIL;

		dev = rt->dst.dev;
@@ -1217,12 +1266,19 @@ static const struct net_device_ops ipgre_netdev_ops = { 
	.ndo_start_xmit		= ipgre_tunnel_xmit,

	.ndo_do_ioctl		= ipgre_tunnel_ioctl,

	.ndo_change_mtu		= ipgre_tunnel_change_mtu,

	.ndo_get_stats		= ipgre_get_stats,

};



static void ipgre_dev_free(struct net_device *dev)

{

	free_percpu(dev->tstats);

	free_netdev(dev);

}



static void ipgre_tunnel_setup(struct net_device *dev)

{

	dev->netdev_ops		= &ipgre_netdev_ops;

	dev->destructor 	= free_netdev;

	dev->destructor 	= ipgre_dev_free;



	dev->type		= ARPHRD_IPGRE;

	dev->needed_headroom 	= LL_MAX_HEADER + sizeof(struct iphdr) + 4;
@@ -1260,6 +1316,10 @@ static int ipgre_tunnel_init(struct net_device *dev) 
	} else

		dev->header_ops = &ipgre_header_ops;



	dev->tstats = alloc_percpu(struct pcpu_tstats);

	if (!dev->tstats)

		return -ENOMEM;



	return 0;

}
@@ -1446,6 +1506,10 @@ static int ipgre_tap_init(struct net_device *dev) 


	ipgre_tunnel_bind_dev(dev);



	dev->tstats = alloc_percpu(struct pcpu_tstats);

	if (!dev->tstats)

		return -ENOMEM;



	return 0;

}
@@ -1456,6 +1520,7 @@ static const struct net_device_ops ipgre_tap_netdev_ops = { 
	.ndo_set_mac_address 	= eth_mac_addr,

	.ndo_validate_addr	= eth_validate_addr,

	.ndo_change_mtu		= ipgre_tunnel_change_mtu,

	.ndo_get_stats		= ipgre_get_stats,

};



static void ipgre_tap_setup(struct net_device *dev)
@@ -1464,7 +1529,7 @@ static void ipgre_tap_setup(struct net_device *dev) 
	ether_setup(dev);



	dev->netdev_ops		= &ipgre_tap_netdev_ops;

	dev->destructor 	= free_netdev;

	dev->destructor 	= ipgre_dev_free;



	dev->iflink		= 0;

	dev->features		|= NETIF_F_NETNS_LOCAL;

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