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net: add a generic tracepoint for TX queue timeout 

Although devlink health report does a nice job on reporting TX
timeout and other NIC errors, unfortunately it requires drivers
to support it but currently only mlx5 has implemented it.
Before other drivers could catch up, it is useful to have a
generic tracepoint to monitor this kind of TX timeout. We have
been suffering TX timeout with different drivers, we plan to
start to monitor it with rasdaemon which just needs a new tracepoint.

Sample output:

  ksoftirqd/1-16    [001] ..s2   144.043173: net_dev_xmit_timeout: dev=ens3 driver=e1000 queue=0

Cc: Eran Ben Elisha <eranbe@mellanox.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2019-05-01 19:56:59 -07:00 committed by David S. Miller
parent f3f050a4df
commit 141b6b2ad7
2 changed files with 25 additions and 0 deletions
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23
include/trace/events/net.h
View File

@ -95,6 +95,29 @@ TRACE_EVENT(net_dev_xmit,
__get_str(name), __entry->skbaddr, __entry->len, __entry->rc)
);
TRACE_EVENT(net_dev_xmit_timeout,
TP_PROTO(struct net_device *dev,
int queue_index),
TP_ARGS(dev, queue_index),
TP_STRUCT__entry(
__string( name, dev->name )
__string( driver, netdev_drivername(dev))
__field( int, queue_index )
),
TP_fast_assign(
__assign_str(name, dev->name);
__assign_str(driver, netdev_drivername(dev));
__entry->queue_index = queue_index;
),
TP_printk("dev=%s driver=%s queue=%d",
__get_str(name), __get_str(driver), __entry->queue_index)
);
DECLARE_EVENT_CLASS(net_dev_template,
TP_PROTO(struct sk_buff *skb),

2
net/sched/sch_generic.c
View File

@ -32,6 +32,7 @@
#include <net/pkt_sched.h>
#include <net/dst.h>
#include <trace/events/qdisc.h>
#include <trace/events/net.h>
#include <net/xfrm.h>
/* Qdisc to use by default */
@ -441,6 +442,7 @@ static void dev_watchdog(struct timer_list *t)
}
if (some_queue_timedout) {
trace_net_dev_xmit_timeout(dev, i);
WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
dev->name, netdev_drivername(dev), i);
dev->netdev_ops->ndo_tx_timeout(dev);