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Message-Id: <20260105-mq-cake-sub-qdisc-v5-1-8a99b9db05e6@redhat.com>
Date: Mon, 05 Jan 2026 13:50:26 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Toke Høiland-Jørgensen <toke@...e.dk>,
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>, Simon Horman <horms@...nel.org>
Cc: Jonas Köppeler <j.koeppeler@...berlin.de>,
cake@...ts.bufferbloat.net, netdev@...r.kernel.org,
Toke Høiland-Jørgensen <toke@...hat.com>
Subject: [PATCH net-next v5 1/6] net/sched: Export mq functions for reuse
To enable the cake_mq qdisc to reuse code from the mq qdisc, export a
bunch of functions from sch_mq. Split common functionality out from some
functions so it can be composed with other code, and export other
functions wholesale. To discourage wanton reuse, put the symbols into a
new NET_SCHED_INTERNAL namespace, and a sch_priv.h header file.
No functional change intended.
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
include/net/sch_priv.h | 27 +++++++++++++++++++
net/sched/sch_mq.c | 71 ++++++++++++++++++++++++++++++++++----------------
2 files changed, 76 insertions(+), 22 deletions(-)
diff --git a/include/net/sch_priv.h b/include/net/sch_priv.h
new file mode 100644
index 000000000000..4789f668ae87
--- /dev/null
+++ b/include/net/sch_priv.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_SCHED_PRIV_H
+#define __NET_SCHED_PRIV_H
+
+#include <net/sch_generic.h>
+
+struct mq_sched {
+ struct Qdisc **qdiscs;
+};
+
+int mq_init_common(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack,
+ const struct Qdisc_ops *qdisc_ops);
+void mq_destroy_common(struct Qdisc *sch);
+void mq_attach(struct Qdisc *sch);
+void mq_dump_common(struct Qdisc *sch, struct sk_buff *skb);
+struct netdev_queue *mq_select_queue(struct Qdisc *sch,
+ struct tcmsg *tcm);
+struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl);
+unsigned long mq_find(struct Qdisc *sch, u32 classid);
+int mq_dump_class(struct Qdisc *sch, unsigned long cl,
+ struct sk_buff *skb, struct tcmsg *tcm);
+int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
+ struct gnet_dump *d);
+void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg);
+
+#endif
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index c860119a8f09..bb94cd577943 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -15,11 +15,7 @@
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/pkt_sched.h>
-#include <net/sch_generic.h>
-
-struct mq_sched {
- struct Qdisc **qdiscs;
-};
+#include <net/sch_priv.h>
static int mq_offload(struct Qdisc *sch, enum tc_mq_command cmd)
{
@@ -49,23 +45,29 @@ static int mq_offload_stats(struct Qdisc *sch)
return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_MQ, &opt);
}
-static void mq_destroy(struct Qdisc *sch)
+void mq_destroy_common(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct mq_sched *priv = qdisc_priv(sch);
unsigned int ntx;
- mq_offload(sch, TC_MQ_DESTROY);
-
if (!priv->qdiscs)
return;
for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
qdisc_put(priv->qdiscs[ntx]);
kfree(priv->qdiscs);
}
+EXPORT_SYMBOL_NS_GPL(mq_destroy_common, "NET_SCHED_INTERNAL");
-static int mq_init(struct Qdisc *sch, struct nlattr *opt,
- struct netlink_ext_ack *extack)
+static void mq_destroy(struct Qdisc *sch)
+{
+ mq_offload(sch, TC_MQ_DESTROY);
+ mq_destroy_common(sch);
+}
+
+int mq_init_common(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack,
+ const struct Qdisc_ops *qdisc_ops)
{
struct net_device *dev = qdisc_dev(sch);
struct mq_sched *priv = qdisc_priv(sch);
@@ -87,7 +89,8 @@ static int mq_init(struct Qdisc *sch, struct nlattr *opt,
for (ntx = 0; ntx < dev->num_tx_queues; ntx++) {
dev_queue = netdev_get_tx_queue(dev, ntx);
- qdisc = qdisc_create_dflt(dev_queue, get_default_qdisc_ops(dev, ntx),
+ qdisc = qdisc_create_dflt(dev_queue,
+ qdisc_ops ?: get_default_qdisc_ops(dev, ntx),
TC_H_MAKE(TC_H_MAJ(sch->handle),
TC_H_MIN(ntx + 1)),
extack);
@@ -98,12 +101,24 @@ static int mq_init(struct Qdisc *sch, struct nlattr *opt,
}
sch->flags |= TCQ_F_MQROOT;
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(mq_init_common, "NET_SCHED_INTERNAL");
+
+static int mq_init(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ int ret;
+
+ ret = mq_init_common(sch, opt, extack, NULL);
+ if (ret)
+ return ret;
mq_offload(sch, TC_MQ_CREATE);
return 0;
}
-static void mq_attach(struct Qdisc *sch)
+void mq_attach(struct Qdisc *sch)
{
struct net_device *dev = qdisc_dev(sch);
struct mq_sched *priv = qdisc_priv(sch);
@@ -124,8 +139,9 @@ static void mq_attach(struct Qdisc *sch)
kfree(priv->qdiscs);
priv->qdiscs = NULL;
}
+EXPORT_SYMBOL_NS_GPL(mq_attach, "NET_SCHED_INTERNAL");
-static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
+void mq_dump_common(struct Qdisc *sch, struct sk_buff *skb)
{
struct net_device *dev = qdisc_dev(sch);
struct Qdisc *qdisc;
@@ -152,7 +168,12 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
spin_unlock_bh(qdisc_lock(qdisc));
}
+}
+EXPORT_SYMBOL_NS_GPL(mq_dump_common, "NET_SCHED_INTERNAL");
+static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ mq_dump_common(sch, skb);
return mq_offload_stats(sch);
}
@@ -166,11 +187,12 @@ static struct netdev_queue *mq_queue_get(struct Qdisc *sch, unsigned long cl)
return netdev_get_tx_queue(dev, ntx);
}
-static struct netdev_queue *mq_select_queue(struct Qdisc *sch,
- struct tcmsg *tcm)
+struct netdev_queue *mq_select_queue(struct Qdisc *sch,
+ struct tcmsg *tcm)
{
return mq_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
}
+EXPORT_SYMBOL_NS_GPL(mq_select_queue, "NET_SCHED_INTERNAL");
static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
struct Qdisc **old, struct netlink_ext_ack *extack)
@@ -198,14 +220,15 @@ static int mq_graft(struct Qdisc *sch, unsigned long cl, struct Qdisc *new,
return 0;
}
-static struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
+struct Qdisc *mq_leaf(struct Qdisc *sch, unsigned long cl)
{
struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
return rtnl_dereference(dev_queue->qdisc_sleeping);
}
+EXPORT_SYMBOL_NS_GPL(mq_leaf, "NET_SCHED_INTERNAL");
-static unsigned long mq_find(struct Qdisc *sch, u32 classid)
+unsigned long mq_find(struct Qdisc *sch, u32 classid)
{
unsigned int ntx = TC_H_MIN(classid);
@@ -213,9 +236,10 @@ static unsigned long mq_find(struct Qdisc *sch, u32 classid)
return 0;
return ntx;
}
+EXPORT_SYMBOL_NS_GPL(mq_find, "NET_SCHED_INTERNAL");
-static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
- struct sk_buff *skb, struct tcmsg *tcm)
+int mq_dump_class(struct Qdisc *sch, unsigned long cl,
+ struct sk_buff *skb, struct tcmsg *tcm)
{
struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
@@ -224,9 +248,10 @@ static int mq_dump_class(struct Qdisc *sch, unsigned long cl,
tcm->tcm_info = rtnl_dereference(dev_queue->qdisc_sleeping)->handle;
return 0;
}
+EXPORT_SYMBOL_NS_GPL(mq_dump_class, "NET_SCHED_INTERNAL");
-static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
- struct gnet_dump *d)
+int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
+ struct gnet_dump *d)
{
struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
@@ -236,8 +261,9 @@ static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
return -1;
return 0;
}
+EXPORT_SYMBOL_NS_GPL(mq_dump_class_stats, "NET_SCHED_INTERNAL");
-static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
+void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
struct net_device *dev = qdisc_dev(sch);
unsigned int ntx;
@@ -251,6 +277,7 @@ static void mq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
break;
}
}
+EXPORT_SYMBOL_NS_GPL(mq_walk, "NET_SCHED_INTERNAL");
static const struct Qdisc_class_ops mq_class_ops = {
.select_queue = mq_select_queue,
--
2.52.0
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