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SubjectRe: [RFC PATCH v3 3/5] netdev: add tracepoints to netdev layer
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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