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RDMA/rtrs-clt: Add event tracing support

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Add event tracing mechanism for following routines:
- rtrs_clt_reconnect_work()
- rtrs_clt_close_conns()
- rtrs_rdma_error_recovery()

How to use:
1. Load the rtrs_client module
2. cd /sys/kernel/debug/tracing
3. If all the events need to be enabled:
        echo 1 > events/rtrs_clt/enable
4. OR only speific routine/event needs to be enabled e.g.
        echo 1 > events/rtrs_clt/rtrs_clt_close_conns/enable
5. cat trace
6. Run some workload which can trigger rtrs_clt_close_conns()

Link: https://lore.kernel.org/r/20220818105240.110234-2-haris.iqbal@ionos.com
Signed-off-by: Santosh Pradhan <santosh.pradhan@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Santosh Pradhan 2022-08-18 12:52:39 +02:00 committed by Leon Romanovsky
parent 13ad1125b9
commit 5a93929d9f
4 changed files with 112 additions and 1 deletions
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5
drivers/infiniband/ulp/rtrs/Makefile
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@ -1,8 +1,11 @@
# SPDX-License-Identifier: GPL-2.0-or-later
CFLAGS_rtrs-clt-trace.o = -I$(src)
rtrs-client-y := rtrs-clt.o \
rtrs-clt-stats.o \
rtrs-clt-sysfs.o
rtrs-clt-sysfs.o \
rtrs-clt-trace.o
rtrs-server-y := rtrs-srv.o \
rtrs-srv-stats.o \

15
drivers/infiniband/ulp/rtrs/rtrs-clt-trace.c Normal file
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@ -0,0 +1,15 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* RDMA Network Block Driver
*
* Copyright (c) 2022 1&1 IONOS SE. All rights reserved.
*/
#include "rtrs.h"
#include "rtrs-clt.h"
/*
* We include this last to have the helpers above available for the trace
* event implementations.
*/
#define CREATE_TRACE_POINTS
#include "rtrs-clt-trace.h"

86
drivers/infiniband/ulp/rtrs/rtrs-clt-trace.h Normal file
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@ -0,0 +1,86 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* RDMA Network Block Driver
*
* Copyright (c) 2022 1&1 IONOS SE. All rights reserved.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM rtrs_clt
#if !defined(_TRACE_RTRS_CLT_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_RTRS_CLT_H
#include <linux/tracepoint.h>
struct rtrs_clt_path;
struct rtrs_clt_sess;
TRACE_DEFINE_ENUM(RTRS_CLT_CONNECTING);
TRACE_DEFINE_ENUM(RTRS_CLT_CONNECTING_ERR);
TRACE_DEFINE_ENUM(RTRS_CLT_RECONNECTING);
TRACE_DEFINE_ENUM(RTRS_CLT_CONNECTED);
TRACE_DEFINE_ENUM(RTRS_CLT_CLOSING);
TRACE_DEFINE_ENUM(RTRS_CLT_CLOSED);
TRACE_DEFINE_ENUM(RTRS_CLT_DEAD);
#define show_rtrs_clt_state(x) \
__print_symbolic(x, \
{ RTRS_CLT_CONNECTING, "CONNECTING" }, \
{ RTRS_CLT_CONNECTING_ERR, "CONNECTING_ERR" }, \
{ RTRS_CLT_RECONNECTING, "RECONNECTING" }, \
{ RTRS_CLT_CONNECTED, "CONNECTED" }, \
{ RTRS_CLT_CLOSING, "CLOSING" }, \
{ RTRS_CLT_CLOSED, "CLOSED" }, \
{ RTRS_CLT_DEAD, "DEAD" })
DECLARE_EVENT_CLASS(rtrs_clt_conn_class,
TP_PROTO(struct rtrs_clt_path *clt_path),
TP_ARGS(clt_path),
TP_STRUCT__entry(
__field(int, state)
__field(int, reconnect_attempts)
__field(int, max_reconnect_attempts)
__field(int, fail_cnt)
__field(int, success_cnt)
__array(char, sessname, NAME_MAX)
),
TP_fast_assign(
struct rtrs_clt_sess *clt = clt_path->clt;
__entry->state = clt_path->state;
__entry->reconnect_attempts = clt_path->reconnect_attempts;
__entry->max_reconnect_attempts = clt->max_reconnect_attempts;
__entry->fail_cnt = clt_path->stats->reconnects.fail_cnt;
__entry->success_cnt = clt_path->stats->reconnects.successful_cnt;
memcpy(__entry->sessname, kobject_name(&clt_path->kobj), NAME_MAX);
),
TP_printk("RTRS-CLT: sess='%s' state=%s attempts='%d' max-attempts='%d' fail='%d' success='%d'",
__entry->sessname,
show_rtrs_clt_state(__entry->state),
__entry->reconnect_attempts,
__entry->max_reconnect_attempts,
__entry->fail_cnt,
__entry->success_cnt
)
);
#define DEFINE_CLT_CONN_EVENT(name) \
DEFINE_EVENT(rtrs_clt_conn_class, rtrs_##name, \
TP_PROTO(struct rtrs_clt_path *clt_path), \
TP_ARGS(clt_path))
DEFINE_CLT_CONN_EVENT(clt_reconnect_work);
DEFINE_CLT_CONN_EVENT(clt_close_conns);
DEFINE_CLT_CONN_EVENT(rdma_error_recovery);
#endif /* _TRACE_RTRS_CLT_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE rtrs-clt-trace
#include <trace/define_trace.h>

7
drivers/infiniband/ulp/rtrs/rtrs-clt.c
View File

@ -16,6 +16,7 @@
#include "rtrs-clt.h"
#include "rtrs-log.h"
#include "rtrs-clt-trace.h"
#define RTRS_CONNECT_TIMEOUT_MS 30000
/*
@ -302,6 +303,8 @@ static void rtrs_rdma_error_recovery(struct rtrs_clt_con *con)
{
struct rtrs_clt_path *clt_path = to_clt_path(con->c.path);
trace_rtrs_rdma_error_recovery(clt_path);
if (rtrs_clt_change_state_from_to(clt_path,
RTRS_CLT_CONNECTED,
RTRS_CLT_RECONNECTING)) {
@ -1942,6 +1945,8 @@ static int rtrs_rdma_conn_rejected(struct rtrs_clt_con *con,
void rtrs_clt_close_conns(struct rtrs_clt_path *clt_path, bool wait)
{
trace_rtrs_clt_close_conns(clt_path);
if (rtrs_clt_change_state_get_old(clt_path, RTRS_CLT_CLOSING, NULL))
queue_work(rtrs_wq, &clt_path->close_work);
if (wait)
@ -2648,6 +2653,8 @@ static void rtrs_clt_reconnect_work(struct work_struct *work)
reconnect_dwork);
clt = clt_path->clt;
trace_rtrs_clt_reconnect_work(clt_path);
if (READ_ONCE(clt_path->state) != RTRS_CLT_RECONNECTING)
return;