netdev - [PATCH v2 net-next] net: tracepoint: exposing sk_faimily in tracepoint inet_sock_set

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Message-Id: <1515306707-1759-1-git-send-email-laoar.shao@gmail.com>
Date:   Sun,  7 Jan 2018 14:31:47 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     songliubraving@...com, davem@...emloft.net,
        brendan.d.gregg@...il.com
Cc:     marcelo.leitner@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v2 net-next] net: tracepoint:  exposing sk_faimily in tracepoint inet_sock_set_state

As of now, there're two sk_family are traced with sock:inet_sock_set_state,
which are AF_INET and AF_INET6.
So the sk_family are exposed as well.
Then we can conveniently use it to do the filter.

Both sk_family and sk_protocol are showed in the printk message, so we need
not expose them as tracepoint arguments.

Suggested-by: Brendan Gregg <brendan.d.gregg@...il.com>
Suggested-by: Song Liu <songliubraving@...com>
Signed-off-by: Yafang Shao <laoar.shao@...il.com>
---
 include/trace/events/sock.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h
index 3537c5f..3176a39 100644
--- a/include/trace/events/sock.h
+++ b/include/trace/events/sock.h
@@ -11,7 +11,11 @@
 #include <linux/ipv6.h>
 #include <linux/tcp.h>

-/* The protocol traced by sock_set_state */
+#define family_names			\
+		EM(AF_INET)				\
+		EMe(AF_INET6)
+
+/* The protocol traced by inet_sock_set_state */
 #define inet_protocol_names		\
 		EM(IPPROTO_TCP)			\
 		EM(IPPROTO_DCCP)		\
@@ -37,6 +41,7 @@
 #define EM(a)       TRACE_DEFINE_ENUM(a);
 #define EMe(a)      TRACE_DEFINE_ENUM(a);

+family_names
 inet_protocol_names
 tcp_state_names

@@ -45,6 +50,9 @@
 #define EM(a)       { a, #a },
 #define EMe(a)      { a, #a }

+#define show_family_name(val)			\
+	__print_symbolic(val, family_names)
+
 #define show_inet_protocol_name(val)    \
 	__print_symbolic(val, inet_protocol_names)

@@ -118,6 +126,7 @@
 		__field(int, newstate)
 		__field(__u16, sport)
 		__field(__u16, dport)
+		__field(__u16, family)
 		__field(__u8, protocol)
 		__array(__u8, saddr, 4)
 		__array(__u8, daddr, 4)
@@ -134,6 +143,7 @@
 		__entry->oldstate = oldstate;
 		__entry->newstate = newstate;

+		__entry->family = sk->sk_family;
 		__entry->protocol = sk->sk_protocol;
 		__entry->sport = ntohs(inet->inet_sport);
 		__entry->dport = ntohs(inet->inet_dport);
@@ -160,7 +170,8 @@
 		}
 	),

-	TP_printk("protocol=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c oldstate=%s newstate=%s",
+	TP_printk("family=%s protocol=%s sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c oldstate=%s newstate=%s",
+			show_family_name(__entry->family),
 			show_inet_protocol_name(__entry->protocol),
 			__entry->sport, __entry->dport,
 			__entry->saddr, __entry->daddr,
--
1.8.3.1