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netdev: Add tracepoints to netdev layer

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This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit,
netif_rx and netif_receive_skb. These tracepoints help you to monitor
network driver's input/output.

          <idle>-0     [001] 112447.902030: netif_rx: dev=eth1 skbaddr=f3ef0900 len=84
          <idle>-0     [001] 112447.902039: netif_receive_skb: dev=eth1 skbaddr=f3ef0900 len=84
            sshd-6828  [000] 112447.903257: net_dev_queue: dev=eth4 skbaddr=f3fca538 len=226
            sshd-6828  [000] 112447.903260: net_dev_xmit: dev=eth4 skbaddr=f3fca538 len=226 rc=0

Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
LKML-Reference: <4C72431E.3000901@jp.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Koki Sanagi 2010-08-23 18:45:02 +09:00 committed by Frederic Weisbecker
parent 3e4b10d7a4
commit cf66ba58b5
3 changed files with 89 additions and 0 deletions
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82
include/trace/events/net.h Normal file
View File

@ -0,0 +1,82 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM net
#if !defined(_TRACE_NET_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NET_H
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ip.h>
#include <linux/tracepoint.h>
TRACE_EVENT(net_dev_xmit,
TP_PROTO(struct sk_buff *skb,
int rc),
TP_ARGS(skb, rc),
TP_STRUCT__entry(
__field( void *, skbaddr )
__field( unsigned int, len )
__field( int, rc )
__string( name, skb->dev->name )
),
TP_fast_assign(
__entry->skbaddr = skb;
__entry->len = skb->len;
__entry->rc = rc;
__assign_str(name, skb->dev->name);
),
TP_printk("dev=%s skbaddr=%p len=%u rc=%d",
__get_str(name), __entry->skbaddr, __entry->len, __entry->rc)
);
DECLARE_EVENT_CLASS(net_dev_template,
TP_PROTO(struct sk_buff *skb),
TP_ARGS(skb),
TP_STRUCT__entry(
__field( void *, skbaddr )
__field( unsigned int, len )
__string( name, skb->dev->name )
),
TP_fast_assign(
__entry->skbaddr = skb;
__entry->len = skb->len;
__assign_str(name, skb->dev->name);
),
TP_printk("dev=%s skbaddr=%p len=%u",
__get_str(name), __entry->skbaddr, __entry->len)
)
DEFINE_EVENT(net_dev_template, net_dev_queue,
TP_PROTO(struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_template, netif_receive_skb,
TP_PROTO(struct sk_buff *skb),
TP_ARGS(skb)
);
DEFINE_EVENT(net_dev_template, netif_rx,
TP_PROTO(struct sk_buff *skb),
TP_ARGS(skb)
);
#endif /* _TRACE_NET_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

6
net/core/dev.c
View File

@ -128,6 +128,7 @@
#include <linux/jhash.h>
#include <linux/random.h>
#include <trace/events/napi.h>
#include <trace/events/net.h>
#include <linux/pci.h>
#include "net-sysfs.h"
@ -1978,6 +1979,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
}
rc = ops->ndo_start_xmit(skb, dev);
trace_net_dev_xmit(skb, rc);
if (rc == NETDEV_TX_OK)
txq_trans_update(txq);
return rc;
@ -1998,6 +2000,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
skb_dst_drop(nskb);
rc = ops->ndo_start_xmit(nskb, dev);
trace_net_dev_xmit(nskb, rc);
if (unlikely(rc != NETDEV_TX_OK)) {
if (rc & ~NETDEV_TX_MASK)
goto out_kfree_gso_skb;
@ -2186,6 +2189,7 @@ int dev_queue_xmit(struct sk_buff *skb)
#ifdef CONFIG_NET_CLS_ACT
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
#endif
trace_net_dev_queue(skb);
if (q->enqueue) {
rc = __dev_xmit_skb(skb, q, dev, txq);
goto out;
@ -2512,6 +2516,7 @@ int netif_rx(struct sk_buff *skb)
if (netdev_tstamp_prequeue)
net_timestamp_check(skb);
trace_netif_rx(skb);
#ifdef CONFIG_RPS
{
struct rps_dev_flow voidflow, *rflow = &voidflow;
@ -2828,6 +2833,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
if (!netdev_tstamp_prequeue)
net_timestamp_check(skb);
trace_netif_receive_skb(skb);
if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
return NET_RX_SUCCESS;

1
net/core/net-traces.c
View File

@ -26,6 +26,7 @@
#define CREATE_TRACE_POINTS
#include <trace/events/skb.h>
#include <trace/events/net.h>
#include <trace/events/napi.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(kfree_skb);