linux-kernel - [PATCH net 1/2] net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs

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Message-Id: <bd1ccdee2ffe28262dea993392e3045a5aa0722b.1686355297.git.peilin.ye@bytedance.com>
Date:   Sat, 10 Jun 2023 20:30:15 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        Vlad Buslov <vladbu@...lanox.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Hillf Danton <hdanton@...a.com>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cong Wang <cong.wang@...edance.com>,
        Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH net 1/2] net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs

From: Peilin Ye <peilin.ye@...edance.com>

Grafting ingress and clsact Qdiscs does not need a for-loop in
qdisc_graft().  Refactor it.  No functional changes intended.

Tested-by: Pedro Tammela <pctammela@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
Reviewed-by: Vlad Buslov <vladbu@...dia.com>
Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/sched/sch_api.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index e4b6452318c0..094ca3a5b633 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1079,12 +1079,12 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 
 	if (parent == NULL) {
 		unsigned int i, num_q, ingress;
+		struct netdev_queue *dev_queue;
 
 		ingress = 0;
 		num_q = dev->num_tx_queues;
 		if ((q && q->flags & TCQ_F_INGRESS) ||
 		    (new && new->flags & TCQ_F_INGRESS)) {
-			num_q = 1;
 			ingress = 1;
 			if (!dev_ingress_queue(dev)) {
 				NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
@@ -1100,18 +1100,18 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 		if (new && new->ops->attach && !ingress)
 			goto skip;
 
-		for (i = 0; i < num_q; i++) {
-			struct netdev_queue *dev_queue = dev_ingress_queue(dev);
-
-			if (!ingress)
+		if (!ingress) {
+			for (i = 0; i < num_q; i++) {
 				dev_queue = netdev_get_tx_queue(dev, i);
+				old = dev_graft_qdisc(dev_queue, new);
 
-			old = dev_graft_qdisc(dev_queue, new);
-			if (new && i > 0)
-				qdisc_refcount_inc(new);
-
-			if (!ingress)
+				if (new && i > 0)
+					qdisc_refcount_inc(new);
 				qdisc_put(old);
+			}
+		} else {
+			dev_queue = dev_ingress_queue(dev);
+			old = dev_graft_qdisc(dev_queue, new);
 		}
 
 skip:
-- 
2.20.1