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kernel: cake_mq: expose sync_time parameter via debugfs

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This patch enables for the configuration of the sync_time parameter.
The value of the sync_time needs to be specified in nanoseconds.
The default value is 200us (200 000 ns).
This is especially helpful to get feedback from users about suitable
values. Once a solid solution is found this patch can be removed.

Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de>
Link: https://github.com/openwrt/openwrt/pull/22380
[Add patch to kernel 6.18 too]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Jonas Köppeler 2026-03-11 18:14:52 +01:00 committed by Hauke Mehrtens
parent b580beb3fc
commit d19e522ec7
2 changed files with 136 additions and 0 deletions
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68
target/linux/generic/hack-6.12/710-net-sched-sch_cake-configure-sync_time-via-debugfs.patch Normal file
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@ -0,0 +1,68 @@
From 4eb720d360d3fc227eedbc76993719e1906c418c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20K=C3=B6ppeler?= <j.koeppeler@tu-berlin.de>
Date: Wed, 11 Mar 2026 17:42:44 +0100
Subject: [PATCH] net/sched: sch_cake: configure sync_time via debugfs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Add a debugfs entry for sync_time to allow runtime adjustment of its
value without recompilation. sync_time is specified in nanoseconds;
setting it to 0 triggers synchronization on every packet.
Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de>
---
net/sched/sch_cake.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletion(-)
--- a/net/sched/sch_cake.c
+++ b/net/sched/sch_cake.c
@@ -71,6 +71,7 @@
#include <net/pkt_cls.h>
#include <net/tcp.h>
#include <net/flow_dissector.h>
+#include <linux/debugfs.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack_core.h>
@@ -81,6 +82,8 @@
#define CAKE_QUEUES (1024)
#define CAKE_FLOW_MASK 63
#define CAKE_FLOW_NAT_FLAG 64
+static u64 g_sync_time_ns = 200*NSEC_PER_USEC;
+static struct dentry *cake_mq_debugfs;
/* struct cobalt_params - contains codel and blue parameters
* @interval: codel initial drop rate
@@ -2013,7 +2016,7 @@ static struct sk_buff *cake_dequeue(stru
u32 len;
if (q->config->is_shared && q->rate_ns &&
- now - q->last_checked_active >= q->config->sync_time) {
+ now - q->last_checked_active >= g_sync_time_ns) {
struct net_device *dev = qdisc_dev(sch);
struct cake_sched_data *other_priv;
u64 new_rate = q->config->rate_bps;
@@ -3352,8 +3355,13 @@ static int __init cake_module_init(void)
return ret;
ret = register_qdisc(&cake_mq_qdisc_ops);
- if (ret)
+ if (ret) {
unregister_qdisc(&cake_qdisc_ops);
+ } else {
+ struct dentry *cake_mq_debugfs = debugfs_create_dir("cake_mq", NULL);
+
+ debugfs_create_u64("sync_time_ns", 0644, cake_mq_debugfs, &g_sync_time_ns);
+ }
return ret;
}
@@ -3362,6 +3370,7 @@ static void __exit cake_module_exit(void
{
unregister_qdisc(&cake_qdisc_ops);
unregister_qdisc(&cake_mq_qdisc_ops);
+ debugfs_remove_recursive(cake_mq_debugfs);
}
module_init(cake_module_init)

68
target/linux/generic/hack-6.18/710-net-sched-sch_cake-configure-sync_time-via-debugfs.patch Normal file
View File

@ -0,0 +1,68 @@
From 4eb720d360d3fc227eedbc76993719e1906c418c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20K=C3=B6ppeler?= <j.koeppeler@tu-berlin.de>
Date: Wed, 11 Mar 2026 17:42:44 +0100
Subject: [PATCH] net/sched: sch_cake: configure sync_time via debugfs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Add a debugfs entry for sync_time to allow runtime adjustment of its
value without recompilation. sync_time is specified in nanoseconds;
setting it to 0 triggers synchronization on every packet.
Signed-off-by: Jonas Köppeler <j.koeppeler@tu-berlin.de>
---
net/sched/sch_cake.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletion(-)
--- a/net/sched/sch_cake.c
+++ b/net/sched/sch_cake.c
@@ -71,6 +71,7 @@
#include <net/pkt_cls.h>
#include <net/tcp.h>
#include <net/flow_dissector.h>
+#include <linux/debugfs.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack_core.h>
@@ -81,6 +82,8 @@
#define CAKE_QUEUES (1024)
#define CAKE_FLOW_MASK 63
#define CAKE_FLOW_NAT_FLAG 64
+static u64 g_sync_time_ns = 200*NSEC_PER_USEC;
+static struct dentry *cake_mq_debugfs;
/* struct cobalt_params - contains codel and blue parameters
* @interval: codel initial drop rate
@@ -2019,7 +2022,7 @@ static struct sk_buff *cake_dequeue(stru
u32 len;
if (q->config->is_shared && q->rate_ns &&
- now - q->last_checked_active >= q->config->sync_time) {
+ now - q->last_checked_active >= g_sync_time_ns) {
struct net_device *dev = qdisc_dev(sch);
struct cake_sched_data *other_priv;
u64 new_rate = q->config->rate_bps;
@@ -3358,8 +3361,13 @@ static int __init cake_module_init(void)
return ret;
ret = register_qdisc(&cake_mq_qdisc_ops);
- if (ret)
+ if (ret) {
unregister_qdisc(&cake_qdisc_ops);
+ } else {
+ struct dentry *cake_mq_debugfs = debugfs_create_dir("cake_mq", NULL);
+
+ debugfs_create_u64("sync_time_ns", 0644, cake_mq_debugfs, &g_sync_time_ns);
+ }
return ret;
}
@@ -3368,6 +3376,7 @@ static void __exit cake_module_exit(void
{
unregister_qdisc(&cake_qdisc_ops);
unregister_qdisc(&cake_mq_qdisc_ops);
+ debugfs_remove_recursive(cake_mq_debugfs);
}
module_init(cake_module_init)