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Date: Fri, 2 Jun 2023 13:37:50 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Vinicius Costa Gomes <vinicius.gomes@...el.com>,
linux-kernel@...r.kernel.org,
intel-wired-lan@...ts.osuosl.org,
Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
Peilin Ye <yepeilin.cs@...il.com>,
Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH RESEND net-next 5/5] net/sched: taprio: dump class stats for the actual q->qdiscs[]
This makes a difference for the software scheduling mode, where
dev_queue->qdisc_sleeping is the same as the taprio root Qdisc itself,
but when we're talking about what Qdisc and stats get reported for a
traffic class, the root taprio isn't what comes to mind, but q->qdiscs[]
is.
To understand the difference, I've attempted to send 100 packets in
software mode through traffic class 0 (they are in the Qdisc's backlog),
and recorded the stats before and after the change.
Here is before:
$ tc -s class show dev eth0
class taprio 8001:1 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:2 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:3 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:4 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:5 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:6 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:7 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:8 root leaf 8001:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
and here is after:
class taprio 8001:1 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 9400b 100p requeues 0
Window drops: 0
class taprio 8001:2 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:3 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:4 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:5 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:6 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:7 root leaf 8010:
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
class taprio 8001:8 root
Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
backlog 0b 0p requeues 0
Window drops: 0
The most glaring (and expected) difference is that before, all class
stats reported the global stats, whereas now, they really report just
the counters for that traffic class.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
net/sched/sch_taprio.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index cc7ff98e5e86..23b98c3af8b2 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -2452,11 +2452,11 @@ static unsigned long taprio_find(struct Qdisc *sch, u32 classid)
static int taprio_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
- struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
+ struct Qdisc *child = taprio_leaf(sch, cl);
tcm->tcm_parent = TC_H_ROOT;
tcm->tcm_handle |= TC_H_MIN(cl);
- tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
+ tcm->tcm_info = child->handle;
return 0;
}
@@ -2466,8 +2466,7 @@ static int taprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
__releases(d->lock)
__acquires(d->lock)
{
- struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
- struct Qdisc *child = dev_queue->qdisc_sleeping;
+ struct Qdisc *child = taprio_leaf(sch, cl);
struct tc_taprio_qopt_offload offload = {
.cmd = TAPRIO_CMD_TC_STATS,
.tc_stats = {
--
2.34.1
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