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Date: Mon, 18 Jan 2010 17:27:20 +0900
From: Koki Sanagi <sanagi.koki@...fujitsu.com>
To: netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com
CC: izumi.taku@...fujitsu.com, kaneshige.kenji@...fujitsu.com
Subject: [PATCH 1/5] tracing/events: add tracepoint to netdev layer
This patch adds tracepoints at dev_hard_start_xmit, dev_queue_xmit and
netif_receive_skb function.
netdev_start_xmit entry of driver's transmit function.
netdev_receive_skb entry of netstack(receive).
dev_queue_xmit entry of Qdisc.
Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com>
---
include/trace/events/skb.h | 69 ++++++++++++++++++++++++++++++++++++++++++++
net/core/dev.c | 4 ++
2 files changed, 73 insertions(+), 0 deletions(-)
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 4b2be6d..d732f07 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -8,6 +8,75 @@
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
+TRACE_EVENT(dev_queue_xmit,
+
+ TP_PROTO(struct sk_buff *skb,
+ struct net_device *dev),
+
+ TP_ARGS(skb, dev),
+
+ TP_STRUCT__entry(
+ __field( const void *, skbaddr )
+ __field( unsigned int, len )
+ __string( name, dev->name )
+ ),
+
+ TP_fast_assign(
+ __entry->skbaddr = skb;
+ __entry->len = skb->len;
+ __assign_str(name, dev->name);
+ ),
+
+ TP_printk("dev=%s skbaddr=%p len=%u",
+ __get_str(name), __entry->skbaddr, __entry->len)
+);
+
+TRACE_EVENT(netdev_start_xmit,
+
+ TP_PROTO(struct sk_buff *skb,
+ struct net_device *dev),
+
+ TP_ARGS(skb, dev),
+
+ TP_STRUCT__entry(
+ __field( const void *, skbaddr )
+ __field( unsigned int, len )
+ __string( name, dev->name )
+ ),
+
+ TP_fast_assign(
+ __entry->skbaddr = skb;
+ __entry->len = skb->len;
+ __assign_str(name, dev->name);
+ ),
+
+ TP_printk("dev=%s skbaddr=%p len=%u",
+ __get_str(name), __entry->skbaddr, __entry->len)
+);
+
+TRACE_EVENT(netdev_receive_skb,
+
+ TP_PROTO(struct sk_buff *skb,
+ struct net_device *dev),
+
+ TP_ARGS(skb, dev),
+
+ TP_STRUCT__entry(
+ __field( const void *, skbaddr )
+ __field( unsigned int, len )
+ __string( name, dev->name )
+ ),
+
+ TP_fast_assign(
+ __entry->skbaddr = skb;
+ __entry->len = skb->len;
+ __assign_str(name, dev->name);
+ ),
+
+ TP_printk("dev=%s skbaddr=%p len=%u",
+ __get_str(name), __entry->skbaddr, __entry->len)
+);
+
/*
* Tracepoint for free an sk_buff:
*/
diff --git a/net/core/dev.c b/net/core/dev.c
index a008f69..ef38f8e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -129,6 +129,7 @@
#include <linux/jhash.h>
#include <linux/random.h>
#include <trace/events/napi.h>
+#include <trace/events/skb.h>
#include "net-sysfs.h"
@@ -1810,6 +1811,7 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
int rc = NETDEV_TX_OK;
if (likely(!skb->next)) {
+ trace_netdev_start_xmit(skb, dev);
if (!list_empty(&ptype_all))
dev_queue_xmit_nit(skb, dev);
@@ -2043,6 +2045,7 @@ int dev_queue_xmit(struct sk_buff *skb)
}
gso:
+ trace_dev_queue_xmit(skb, dev);
/* Disable soft irqs for various locks below. Also
* stops preemption for RCU.
*/
@@ -2458,6 +2461,7 @@ int netif_receive_skb(struct sk_buff *skb)
__get_cpu_var(netdev_rx_stat).total++;
+ trace_netdev_receive_skb(skb, orig_dev);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb->mac_len = skb->network_header - skb->mac_header;
--
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