netdev: Add tracepoints to netdev layer

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>

3 files changed, 89 insertions, 0 deletions

diff --git a/include/trace/events/net.h b/include/trace/events/net.h
new file mode 100644
index 000000000000..5f247f5ffc56
--- /dev/null
+++ b/include/trace/events/net.h
@@ -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>
diff --git a/net/core/dev.c b/net/core/dev.c
index 3721fbb9a83c..5a4fbc7405e2 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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 @@ 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;
@@ -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;
 
diff --git a/net/core/net-traces.c b/net/core/net-traces.c
index afa6380ed88a..7f1bb2aba03b 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);