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net/smc: Introduce tracepoint for smcr link down

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SMC-R link down event is important to help us find links' issues, we
should track this event, especially in the single nic mode, which means
upper layer connection would be shut down. Then find out the direct
link-down reason in time, not only increased the counter, also the
location of the code who triggered this event.

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 15:39:16 +08:00 committed by David S. Miller
parent aff3083f10
commit a3a0e81b6f
3 changed files with 38 additions and 2 deletions
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9
net/smc/smc_core.c
View file

@ -34,6 +34,7 @@
#include "smc_ism.h"
#include "smc_netlink.h"
#include "smc_stats.h"
#include "smc_tracepoint.h"
#define SMC_LGR_NUM_INCR 256
#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
@ -1620,15 +1621,19 @@ static void smcr_link_down(struct smc_link *lnk)
/* must be called under lgr->llc_conf_mutex lock */
void smcr_link_down_cond(struct smc_link *lnk)
{
if (smc_link_downing(&lnk->state))
if (smc_link_downing(&lnk->state)) {
trace_smcr_link_down(lnk, __builtin_return_address(0));
smcr_link_down(lnk);
}
}
/* will get the lgr->llc_conf_mutex lock */
void smcr_link_down_cond_sched(struct smc_link *lnk)
{
if (smc_link_downing(&lnk->state))
if (smc_link_downing(&lnk->state)) {
trace_smcr_link_down(lnk, __builtin_return_address(0));
schedule_work(&lnk->link_down_wrk);
}
}
void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)

1
net/smc/smc_tracepoint.c
View file

@ -6,3 +6,4 @@
EXPORT_TRACEPOINT_SYMBOL(smc_switch_to_fallback);
EXPORT_TRACEPOINT_SYMBOL(smc_tx_sendmsg);
EXPORT_TRACEPOINT_SYMBOL(smc_rx_recvmsg);
EXPORT_TRACEPOINT_SYMBOL(smcr_link_down);

30
net/smc/smc_tracepoint.h
View file

@ -75,6 +75,36 @@ DEFINE_EVENT(smc_msg_event, smc_rx_recvmsg,
TP_ARGS(smc, len)
);
TRACE_EVENT(smcr_link_down,
TP_PROTO(const struct smc_link *lnk, void *location),
TP_ARGS(lnk, location),
TP_STRUCT__entry(
__field(const void *, lnk)
__field(const void *, lgr)
__field(int, state)
__string(name, lnk->ibname)
__field(void *, location)
),
TP_fast_assign(
const struct smc_link_group *lgr = lnk->lgr;
__entry->lnk = lnk;
__entry->lgr = lgr;
__entry->state = lnk->state;
__assign_str(name, lnk->ibname);
__entry->location = location;
),
TP_printk("lnk=%p lgr=%p state=%d dev=%s location=%p",
__entry->lnk, __entry->lgr,
__entry->state, __get_str(name),
__entry->location)
);
#endif /* _TRACE_SMC_H */
#undef TRACE_INCLUDE_PATH