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net/smc: Introduce tracepoints for tx and rx msg

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This introduce two tracepoints for smc tx and rx msg to help us
diagnosis issues of data path. These two tracepoitns don't cover the
path of CORK or MSG_MORE in tx, just the top half of data path.

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 15:39:14 +08:00 committed by David S. Miller
parent 4826260868
commit aff3083f10
4 changed files with 45 additions and 0 deletions
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3
net/smc/smc_rx.c
View file

@ -22,6 +22,7 @@
#include "smc_tx.h" /* smc_tx_consumer_update() */
#include "smc_rx.h"
#include "smc_stats.h"
#include "smc_tracepoint.h"
/* callback implementation to wakeup consumers blocked with smc_rx_wait().
* indirectly called by smc_cdc_msg_recv_action().
@ -438,6 +439,8 @@ int smc_rx_recvmsg(struct smc_sock *smc, struct msghdr *msg,
if (msg && smc_rx_update_consumer(smc, cons, copylen))
goto out;
}
trace_smc_rx_recvmsg(smc, copylen);
} while (read_remaining);
out:
return read_done;

2
net/smc/smc_tracepoint.c
View file

@ -4,3 +4,5 @@
#include "smc_tracepoint.h"
EXPORT_TRACEPOINT_SYMBOL(smc_switch_to_fallback);
EXPORT_TRACEPOINT_SYMBOL(smc_tx_sendmsg);
EXPORT_TRACEPOINT_SYMBOL(smc_rx_recvmsg);

37
net/smc/smc_tracepoint.h
View file

@ -38,6 +38,43 @@ TRACE_EVENT(smc_switch_to_fallback,
__entry->sk, __entry->clcsk, __entry->fallback_rsn)
);
DECLARE_EVENT_CLASS(smc_msg_event,
TP_PROTO(const struct smc_sock *smc, size_t len),
TP_ARGS(smc, len),
TP_STRUCT__entry(
__field(const void *, smc)
__field(size_t, len)
__string(name, smc->conn.lnk->ibname)
),
TP_fast_assign(
__entry->smc = smc;
__entry->len = len;
__assign_str(name, smc->conn.lnk->ibname);
),
TP_printk("smc=%p len=%zu dev=%s",
__entry->smc, __entry->len,
__get_str(name))
);
DEFINE_EVENT(smc_msg_event, smc_tx_sendmsg,
TP_PROTO(const struct smc_sock *smc, size_t len),
TP_ARGS(smc, len)
);
DEFINE_EVENT(smc_msg_event, smc_rx_recvmsg,
TP_PROTO(const struct smc_sock *smc, size_t len),
TP_ARGS(smc, len)
);
#endif /* _TRACE_SMC_H */
#undef TRACE_INCLUDE_PATH

3
net/smc/smc_tx.c
View file

@ -28,6 +28,7 @@
#include "smc_ism.h"
#include "smc_tx.h"
#include "smc_stats.h"
#include "smc_tracepoint.h"
#define SMC_TX_WORK_DELAY 0
#define SMC_TX_CORK_DELAY (HZ >> 2) /* 250 ms */
@ -245,6 +246,8 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
SMC_TX_CORK_DELAY);
else
smc_tx_sndbuf_nonempty(conn);
trace_smc_tx_sendmsg(smc, copylen);
} /* while (msg_data_left(msg)) */
return send_done;