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Date: Sat, 6 Jan 2018 17:46:33 +0000
From: Song Liu <songliubraving@...com>
To: Yafang Shao <laoar.shao@...il.com>
CC: David Miller <davem@...emloft.net>,
"brendan.d.gregg@...il.com" <brendan.d.gregg@...il.com>,
"marcelo.leitner@...il.com" <marcelo.leitner@...il.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: tracepoint: adding new tracepoint arguments
in inet_sock_set_state
> On Jan 5, 2018, at 12:09 AM, Yafang Shao <laoar.shao@...il.com> wrote:
>
> On Fri, Jan 5, 2018 at 3:21 PM, Song Liu <songliubraving@...com> wrote:
>>
>>> On Jan 4, 2018, at 10:42 PM, Yafang Shao <laoar.shao@...il.com> wrote:
>>>
>>> sk->sk_protocol and sk->sk_family are exposed as tracepoint arguments.
>>> Then we can conveniently use these two arguments to do the filter.
>>>
>>> Suggested-by: Brendan Gregg <brendan.d.gregg@...il.com>
>>> Signed-off-by: Yafang Shao <laoar.shao@...il.com>
>>> ---
>>> include/trace/events/sock.h | 24 ++++++++++++++++++------
>>> net/ipv4/af_inet.c | 6 ++++--
>>> 2 files changed, 22 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h
>>> index 3537c5f..c7df70f 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)
>>>
>>> @@ -108,9 +116,10 @@
>>>
>>> TRACE_EVENT(inet_sock_set_state,
>>>
>>> - TP_PROTO(const struct sock *sk, const int oldstate, const int newstate),
>>> + TP_PROTO(const struct sock *sk, const int family, const int protocol,
>>> + const int oldstate, const int newstate),
>>
>> Are there cases we need protocol and/or family that is different to
>> sk->sk_protocol/sk_family? If not, I think we don't need to change the
>> TP_PROTO.
>>
>> Thanks,
>> Song
>>
>
> As of now, there're two sk_family, which are AF_INET and AF_INET6, and
> three sk_protocol which are IPPROTO_TCP, IPPROTO_SCTP and
> IPPROTO_DCCP.
>
> Thanks
> Yafang
How about we do not change the TP_PROTO line? The patch will be like:
@@ -118,6 +127,7 @@
__field(int, newstate)
__field(__u16, sport)
__field(__u16, dport)
+ __field(__u16, family)
__field(__u8, protocol)
__array(__u8, saddr, 4)
__array(__u8, daddr, 4)
@@ -133,8 +143,9 @@
__entry->skaddr = sk;
__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);
@@ xxxxx
- 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),
Thanks,
Song
>>>
>>> - TP_ARGS(sk, oldstate, newstate),
>>> + TP_ARGS(sk, family, protocol, oldstate, newstate),
>>>
>>> TP_STRUCT__entry(
>>> __field(const void *, skaddr)
>>> @@ -118,6 +127,7 @@
>>> __field(int, newstate)
>>> __field(__u16, sport)
>>> __field(__u16, dport)
>>> + __field(__u16, family)
>>> __field(__u8, protocol)
>>> __array(__u8, saddr, 4)
>>> __array(__u8, daddr, 4)
>>> @@ -133,8 +143,9 @@
>>> __entry->skaddr = sk;
>>> __entry->oldstate = oldstate;
>>> __entry->newstate = newstate;
>>> + __entry->family = family;
>>> + __entry->protocol = protocol;
>>>
>>> - __entry->protocol = sk->sk_protocol;
>>> __entry->sport = ntohs(inet->inet_sport);
>>> __entry->dport = ntohs(inet->inet_dport);
>>>
>>> @@ -145,7 +156,7 @@
>>> *p32 = inet->inet_daddr;
>>>
>>> #if IS_ENABLED(CONFIG_IPV6)
>>> - if (sk->sk_family == AF_INET6) {
>>> + if (family == AF_INET6) {
>>> pin6 = (struct in6_addr *)__entry->saddr_v6;
>>> *pin6 = sk->sk_v6_rcv_saddr;
>>> pin6 = (struct in6_addr *)__entry->daddr_v6;
>>> @@ -160,7 +171,8 @@
>>> }
>>> ),
>>>
>>> - 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,
>>> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
>>> index bab98a4..1d52796 100644
>>> --- a/net/ipv4/af_inet.c
>>> +++ b/net/ipv4/af_inet.c
>>> @@ -1223,14 +1223,16 @@ int inet_sk_rebuild_header(struct sock *sk)
>>>
>>> void inet_sk_set_state(struct sock *sk, int state)
>>> {
>>> - trace_inet_sock_set_state(sk, sk->sk_state, state);
>>> + trace_inet_sock_set_state(sk, sk->sk_family, sk->sk_protocol,
>>> + sk->sk_state, state);
>>> sk->sk_state = state;
>>> }
>>> EXPORT_SYMBOL(inet_sk_set_state);
>>>
>>> void inet_sk_state_store(struct sock *sk, int newstate)
>>> {
>>> - trace_inet_sock_set_state(sk, sk->sk_state, newstate);
>>> + trace_inet_sock_set_state(sk, sk->sk_family, sk->sk_protocol,
>>> + sk->sk_state, newstate);
>>> smp_store_release(&sk->sk_state, newstate);
>>> }
>>>
>>> --
>>> 1.8.3.1
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