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authorTony Lu <tonylu@linux.alibaba.com>2021-11-01 15:39:16 +0800
committerDavid S. Miller <davem@davemloft.net>2021-11-01 13:39:14 +0000
commita3a0e81b6fd55745e100735c7667cd99a0650811 (patch)
treeb87dd34f6efbe873248fc0ec056267e2877be182 /net
parentaff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 (diff)
net/smc: Introduce tracepoint for smcr link down
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>
Diffstat (limited to 'net')
-rw-r--r--net/smc/smc_core.c9
-rw-r--r--net/smc/smc_tracepoint.c1
-rw-r--r--net/smc/smc_tracepoint.h30
3 files changed, 38 insertions, 2 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 8e642f8f334f..49b8ba3bb683 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -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)
diff --git a/net/smc/smc_tracepoint.c b/net/smc/smc_tracepoint.c
index af031811ddb3..8d47ced5a492 100644
--- a/net/smc/smc_tracepoint.c
+++ b/net/smc/smc_tracepoint.c
@@ -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);
diff --git a/net/smc/smc_tracepoint.h b/net/smc/smc_tracepoint.h
index eced1546afae..b4c36795a928 100644
--- a/net/smc/smc_tracepoint.h
+++ b/net/smc/smc_tracepoint.h
@@ -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