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net: dccp: Add DCCP sendmsg trace event

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Add DCCP sendmsg trace event (dccp/dccp_probe) for
replacing dccpprobe. User can trace this event via
ftrace or perftools.

Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Masami Hiramatsu 2017-12-29 11:47:55 +09:00 • committed by David S. Miller
commit ee549be6f0
5 changed files with 137 additions and 38 deletions
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3
net/dccp/Makefile
View file

@ -27,3 +27,6 @@ dccp-$(CONFIG_SYSCTL) += sysctl.o
dccp_diag-y := diag.o
dccp_probe-y := probe.o
# build with local directory for trace.h
CFLAGS_proto.o := -I$(src)

5
net/dccp/proto.c
View file

@ -38,6 +38,9 @@
#include "dccp.h"
#include "feat.h"
#define CREATE_TRACE_POINTS
#include "trace.h"
DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
EXPORT_SYMBOL_GPL(dccp_statistics);
@ -761,6 +764,8 @@ int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
int rc, size;
long timeo;
trace_dccp_probe(sk, len);
if (len > dp->dccps_mss_cache)
return -EMSGSIZE;

84
net/dccp/trace.h Normal file
View file

@ -0,0 +1,84 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM dccp
#if !defined(_TRACE_DCCP_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_DCCP_H
#include <net/sock.h>
#include "dccp.h"
#include "ccids/ccid3.h"
#include <linux/tracepoint.h>
#include <trace/events/net_probe_common.h>
TRACE_EVENT(dccp_probe,
TP_PROTO(struct sock *sk, size_t size),
TP_ARGS(sk, size),
TP_STRUCT__entry(
/* sockaddr_in6 is always bigger than sockaddr_in */
__array(__u8, saddr, sizeof(struct sockaddr_in6))
__array(__u8, daddr, sizeof(struct sockaddr_in6))
__field(__u16, sport)
__field(__u16, dport)
__field(__u16, size)
__field(__u16, tx_s)
__field(__u32, tx_rtt)
__field(__u32, tx_p)
__field(__u32, tx_x_calc)
__field(__u64, tx_x_recv)
__field(__u64, tx_x)
__field(__u32, tx_t_ipi)
),
TP_fast_assign(
const struct inet_sock *inet = inet_sk(sk);
struct ccid3_hc_tx_sock *hc = NULL;
if (ccid_get_current_tx_ccid(dccp_sk(sk)) == DCCPC_CCID3)
hc = ccid3_hc_tx_sk(sk);
memset(__entry->saddr, 0, sizeof(struct sockaddr_in6));
memset(__entry->daddr, 0, sizeof(struct sockaddr_in6));
TP_STORE_ADDR_PORTS(__entry, inet, sk);
/* For filtering use */
__entry->sport = ntohs(inet->inet_sport);
__entry->dport = ntohs(inet->inet_dport);
__entry->size = size;
if (hc) {
__entry->tx_s = hc->tx_s;
__entry->tx_rtt = hc->tx_rtt;
__entry->tx_p = hc->tx_p;
__entry->tx_x_calc = hc->tx_x_calc;
__entry->tx_x_recv = hc->tx_x_recv >> 6;
__entry->tx_x = hc->tx_x >> 6;
__entry->tx_t_ipi = hc->tx_t_ipi;
} else {
__entry->tx_s = 0;
memset(&__entry->tx_rtt, 0, (void *)&__entry->tx_t_ipi -
(void *)&__entry->tx_rtt +
sizeof(__entry->tx_t_ipi));
}
),
TP_printk("src=%pISpc dest=%pISpc size=%d tx_s=%d tx_rtt=%d "
"tx_p=%d tx_x_calc=%u tx_x_recv=%llu tx_x=%llu tx_t_ipi=%d",
__entry->saddr, __entry->daddr, __entry->size,
__entry->tx_s, __entry->tx_rtt, __entry->tx_p,
__entry->tx_x_calc, __entry->tx_x_recv, __entry->tx_x,
__entry->tx_t_ipi)
);
#endif /* _TRACE_TCP_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>