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net/smc: Introduce tracepoint for fallback

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This introduces tracepoint for smc fallback to TCP, so that we can track
which connection and why it fallbacks, and map the clcsocks' pointer with
/proc/net/tcp to find more details about TCP connections. Compared with
kprobe or other dynamic tracing, tracepoints are stable and easy to use.

Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tony Lu 2021-11-01 15:39:12 +08:00 committed by David S. Miller
parent 6008889121
commit 4826260868
4 changed files with 59 additions and 0 deletions
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2
net/smc/Makefile
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@ -1,5 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
ccflags-y += -I$(src)
obj-$(CONFIG_SMC) += smc.o
obj-$(CONFIG_SMC_DIAG) += smc_diag.o
smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
smc-y += smc_tracepoint.o

2
net/smc/af_smc.c
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@ -50,6 +50,7 @@
#include "smc_rx.h"
#include "smc_close.h"
#include "smc_stats.h"
#include "smc_tracepoint.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
@ -564,6 +565,7 @@ static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
smc->use_fallback = true;
smc->fallback_rsn = reason_code;
smc_stat_fallback(smc);
trace_smc_switch_to_fallback(smc, reason_code);
if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
smc->clcsock->file = smc->sk.sk_socket->file;
smc->clcsock->file->private_data = smc->clcsock;

6
net/smc/smc_tracepoint.c Normal file
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@ -0,0 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
#define CREATE_TRACE_POINTS
#include "smc_tracepoint.h"
EXPORT_TRACEPOINT_SYMBOL(smc_switch_to_fallback);

49
net/smc/smc_tracepoint.h Normal file
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@ -0,0 +1,49 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM smc
#if !defined(_TRACE_SMC_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SMC_H
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/tracepoint.h>
#include <net/ipv6.h>
#include "smc.h"
#include "smc_core.h"
TRACE_EVENT(smc_switch_to_fallback,
TP_PROTO(const struct smc_sock *smc, int fallback_rsn),
TP_ARGS(smc, fallback_rsn),
TP_STRUCT__entry(
__field(const void *, sk)
__field(const void *, clcsk)
__field(int, fallback_rsn)
),
TP_fast_assign(
const struct sock *sk = &smc->sk;
const struct sock *clcsk = smc->clcsock->sk;
__entry->sk = sk;
__entry->clcsk = clcsk;
__entry->fallback_rsn = fallback_rsn;
),
TP_printk("sk=%p clcsk=%p fallback_rsn=%d",
__entry->sk, __entry->clcsk, __entry->fallback_rsn)
);
#endif /* _TRACE_SMC_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE smc_tracepoint
#include <trace/define_trace.h>