netdev - Re: [PATCH net-next 3/4] net_sched: sch_fq: add fast path for mostly idle qdisc

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Date: Mon, 25 Sep 2023 10:25:20 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Willem de Bruijn <willemb@...gle.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 3/4] net_sched: sch_fq: add fast path for mostly
 idle qdisc

Hi Eric,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Eric-Dumazet/net_sched-sch_fq-struct-sched_data-reorg/20230920-205744
base:   net-next/main
patch link:    https://lore.kernel.org/r/20230920125418.3675569-4-edumazet%40google.com
patch subject: [PATCH net-next 3/4] net_sched: sch_fq: add fast path for mostly idle qdisc
config: x86_64-rhel-8.3-rust (https://download.01.org/0day-ci/archive/20230925/202309251006.HEmH6uZd-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230925/202309251006.HEmH6uZd-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309251006.HEmH6uZd-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> net/sched/sch_fq.c:550:1: warning: unused label 'queue' [-Wunused-label]
   queue:
   ^~~~~~
   1 warning generated.


vim +/queue +550 net/sched/sch_fq.c

   505	
   506	
   507	static int fq_enqueue(struct sk_buff *skb, struct Qdisc *sch,
   508			      struct sk_buff **to_free)
   509	{
   510		struct fq_sched_data *q = qdisc_priv(sch);
   511		struct fq_flow *f;
   512	
   513		if (unlikely(sch->q.qlen >= sch->limit))
   514			return qdisc_drop(skb, sch, to_free);
   515	
   516		q->ktime_cache = ktime_get_ns();
   517		if (!skb->tstamp) {
   518			fq_skb_cb(skb)->time_to_send = q->ktime_cache;
   519		} else {
   520			/* Check if packet timestamp is too far in the future. */
   521			if (fq_packet_beyond_horizon(skb, q)) {
   522				if (q->horizon_drop) {
   523						q->stat_horizon_drops++;
   524						return qdisc_drop(skb, sch, to_free);
   525				}
   526				q->stat_horizon_caps++;
   527				skb->tstamp = q->ktime_cache + q->horizon;
   528			}
   529			fq_skb_cb(skb)->time_to_send = skb->tstamp;
   530		}
   531	
   532		f = fq_classify(sch, skb);
   533		if (unlikely(f->qlen >= q->flow_plimit && f != &q->internal)) {
   534			q->stat_flows_plimit++;
   535			return qdisc_drop(skb, sch, to_free);
   536		}
   537	
   538		if (fq_flow_is_detached(f)) {
   539			fq_flow_add_tail(&q->new_flows, f);
   540			if (time_after(jiffies, f->age + q->flow_refill_delay))
   541				f->credit = max_t(u32, f->credit, q->quantum);
   542		}
   543	
   544		if (unlikely(f == &q->internal)) {
   545			q->stat_internal_packets++;
   546		} else {
   547			if (f->qlen == 0)
   548				q->inactive_flows--;
   549		}
 > 550	queue:
   551		f->qlen++;
   552		/* Note: this overwrites f->age */
   553		flow_queue_add(f, skb);
   554	
   555		qdisc_qstats_backlog_inc(sch, skb);
   556		sch->q.qlen++;
   557	
   558		return NET_XMIT_SUCCESS;
   559	}
   560	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki