Patchwork [RFC,v3,3/5] netdev: add tracepoints to netdev layer

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Submitter Koki Sanagi
Date July 20, 2010, 12:47 a.m.
Message ID <4C44F23F.6050800@jp.fujitsu.com>
Download mbox | patch
Permalink /patch/59245/
State RFC
Delegated to: David Miller
Headers show

Comments

Koki Sanagi - July 20, 2010, 12:47 a.m.
This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit and
netif_receive_skb. These tracepoints help you to monitor network driver's
input/output.

            sshd-4445  [001] 241367.066046: net_dev_queue: dev=eth3 skbaddr=dd6b2538 len=114
            sshd-4445  [001] 241367.066047: net_dev_xmit: dev=eth3 skbaddr=dd6b2538 len=114 rc=0
          <idle>-0     [001] 241367.067472: net_dev_receive: dev=eth3 skbaddr=f5e59000 len=52

Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
---
 include/trace/events/net.h |   75 ++++++++++++++++++++++++++++++++++++++++++++
 net/core/dev.c             |    5 +++
 net/core/net-traces.c      |    1 +
 3 files changed, 81 insertions(+), 0 deletions(-)


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Neil Horman - July 20, 2010, 11:41 a.m.
On Tue, Jul 20, 2010 at 09:47:59AM +0900, Koki Sanagi wrote:
> This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit and
> netif_receive_skb. These tracepoints help you to monitor network driver's
> input/output.
> 
>             sshd-4445  [001] 241367.066046: net_dev_queue: dev=eth3 skbaddr=dd6b2538 len=114
>             sshd-4445  [001] 241367.066047: net_dev_xmit: dev=eth3 skbaddr=dd6b2538 len=114 rc=0
>           <idle>-0     [001] 241367.067472: net_dev_receive: dev=eth3 skbaddr=f5e59000 len=52
> 
> Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
> ---
>  include/trace/events/net.h |   75 ++++++++++++++++++++++++++++++++++++++++++++
>  net/core/dev.c             |    5 +++
>  net/core/net-traces.c      |    1 +
>  3 files changed, 81 insertions(+), 0 deletions(-)
> 
> diff --git a/include/trace/events/net.h b/include/trace/events/net.h
> new file mode 100644
> index 0000000..8a21361
> --- /dev/null
> +++ b/include/trace/events/net.h
> @@ -0,0 +1,75 @@
> +#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, net_dev_receive,
> +
> +	TP_PROTO(struct sk_buff *skb),
> +
> +	TP_ARGS(skb)
> +);
> +#endif /* _TRACE_NET_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 93b8929..4acfec6 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -130,6 +130,7 @@
>  #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"
> @@ -1955,6 +1956,7 @@ 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;
> @@ -1975,6 +1977,7 @@ gso:
>  			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;
> @@ -2165,6 +2168,7 @@ 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;
> @@ -2939,6 +2943,7 @@ int netif_receive_skb(struct sk_buff *skb)
>  	if (netdev_tstamp_prequeue)
>  		net_timestamp_check(skb);
>  
> +	trace_net_dev_receive(skb);

I imagine for completeness you'll want to make a call to this in netif_rx and
netif_rx_ni as well.


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Koki Sanagi - July 21, 2010, 7:01 a.m.
(2010/07/20 20:41), Neil Horman wrote:
> On Tue, Jul 20, 2010 at 09:47:59AM +0900, Koki Sanagi wrote:
>> This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit and
>> netif_receive_skb. These tracepoints help you to monitor network driver's
>> input/output.
>>
>>             sshd-4445  [001] 241367.066046: net_dev_queue: dev=eth3 skbaddr=dd6b2538 len=114
>>             sshd-4445  [001] 241367.066047: net_dev_xmit: dev=eth3 skbaddr=dd6b2538 len=114 rc=0
>>           <idle>-0     [001] 241367.067472: net_dev_receive: dev=eth3 skbaddr=f5e59000 len=52
>>
>> Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>> ---
>>  include/trace/events/net.h |   75 ++++++++++++++++++++++++++++++++++++++++++++
>>  net/core/dev.c             |    5 +++
>>  net/core/net-traces.c      |    1 +
>>  3 files changed, 81 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/trace/events/net.h b/include/trace/events/net.h
>> new file mode 100644
>> index 0000000..8a21361
>> --- /dev/null
>> +++ b/include/trace/events/net.h
>> @@ -0,0 +1,75 @@
>> +#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, net_dev_receive,
>> +
>> +	TP_PROTO(struct sk_buff *skb),
>> +
>> +	TP_ARGS(skb)
>> +);
>> +#endif /* _TRACE_NET_H */
>> +
>> +/* This part must be outside protection */
>> +#include <trace/define_trace.h>
>> diff --git a/net/core/dev.c b/net/core/dev.c
>> index 93b8929..4acfec6 100644
>> --- a/net/core/dev.c
>> +++ b/net/core/dev.c
>> @@ -130,6 +130,7 @@
>>  #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"
>> @@ -1955,6 +1956,7 @@ 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;
>> @@ -1975,6 +1977,7 @@ gso:
>>  			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;
>> @@ -2165,6 +2168,7 @@ 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;
>> @@ -2939,6 +2943,7 @@ int netif_receive_skb(struct sk_buff *skb)
>>  	if (netdev_tstamp_prequeue)
>>  		net_timestamp_check(skb);
>>  
>> +	trace_net_dev_receive(skb);
> 
> I imagine for completeness you'll want to make a call to this in netif_rx and
> netif_rx_ni as well.
> 
It might be better to add tracepoint to netif_rx to determine a time between
netif_rx and netif_receive_skb.

Thanks,
Koki Sanagi.

> 
> 
> 


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Patch

diff --git a/include/trace/events/net.h b/include/trace/events/net.h
new file mode 100644
index 0000000..8a21361
--- /dev/null
+++ b/include/trace/events/net.h
@@ -0,0 +1,75 @@ 
+#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, net_dev_receive,
+
+	TP_PROTO(struct sk_buff *skb),
+
+	TP_ARGS(skb)
+);
+#endif /* _TRACE_NET_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/net/core/dev.c b/net/core/dev.c
index 93b8929..4acfec6 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -130,6 +130,7 @@ 
 #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"
@@ -1955,6 +1956,7 @@  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;
@@ -1975,6 +1977,7 @@  gso:
 			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;
@@ -2165,6 +2168,7 @@  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;
@@ -2939,6 +2943,7 @@  int netif_receive_skb(struct sk_buff *skb)
 	if (netdev_tstamp_prequeue)
 		net_timestamp_check(skb);
 
+	trace_net_dev_receive(skb);
 #ifdef CONFIG_RPS
 	{
 		struct rps_dev_flow voidflow, *rflow = &voidflow;
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index afa6380..7f1bb2a 100644
--- a/net/core/net-traces.c
+++ b/net/core/net-traces.c
@@ -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);