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Message-ID: <CALOAHbD+xe4HjQZ+2uhf8Ne66mNLLmAf+J6mkbbGfvTfitJYQw@mail.gmail.com>
Date: Fri, 5 Jan 2018 16:09:48 +0800
From: Yafang Shao <laoar.shao@...il.com>
To: Song Liu <songliubraving@...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 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
>>
>> - 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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