netdev - [PATCH net-next 01/18] net/sched: sch_api: add helper for tc qdisc walker stats dump

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Date:   Fri, 16 Sep 2022 11:05:27 +0800
From:   Zhengchao Shao <shaozhengchao@...wei.com>
To:     <netdev@...r.kernel.org>, <cake@...ts.bufferbloat.net>,
        <linux-kselftest@...r.kernel.org>, <jhs@...atatu.com>,
        <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <toke@...e.dk>, <vinicius.gomes@...el.com>,
        <stephen@...workplumber.org>, <shuah@...nel.org>,
        <victor@...atatu.com>
CC:     <zhijianx.li@...el.com>, <weiyongjun1@...wei.com>,
        <yuehaibing@...wei.com>, <shaozhengchao@...wei.com>
Subject: [PATCH net-next 01/18] net/sched: sch_api: add helper for tc qdisc walker stats dump

The walk implementation of most qdisc class modules is basically the
same. That is, the values of count and skip are checked first. If
count is greater than or equal to skip, the registered fn function is
executed. Otherwise, increase the value of count. So we can reconstruct
them.

Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 include/net/pkt_sched.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 29f65632ebc5..243e8b0cb7ea 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -222,4 +222,17 @@ static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
 	return cb;
 }
 
+static inline bool tc_qdisc_stats_dump(struct Qdisc *sch,
+				       struct qdisc_walker *arg,
+				       unsigned long cl)
+{
+	if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) {
+		arg->stop = 1;
+		return false;
+	}
+
+	arg->count++;
+	return true;
+}
+
 #endif
-- 
2.17.1