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Message-Id: <20211020174955.1102089-3-vladimir.oltean@nxp.com>
Date: Wed, 20 Oct 2021 20:49:50 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>
Cc: Florian Fainelli <f.fainelli@...il.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH RESEND v3 net-next 2/7] net: dsa: remove the "dsa_to_port in a loop" antipattern from the core
Ever since Vivien's conversion of the ds->ports array into a dst->ports
list, and the introduction of dsa_to_port, iterations through the ports
of a switch became quadratic whenever dsa_to_port was needed.
dsa_to_port can either be called directly, or indirectly through the
dsa_is_{user,cpu,dsa,unused}_port helpers.
Use the newly introduced dsa_switch_for_each_port() iteration macro
that works with the iterator variable being a struct dsa_port *dp
directly, and not an int i. It is an expensive variable to go from i to
dp, but cheap to go from dp to i.
This macro iterates through the entire ds->dst->ports list and filters
by the ports belonging just to the switch provided as argument.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
include/net/dsa.h | 7 +++----
net/dsa/dsa.c | 22 +++++++++++-----------
net/dsa/dsa2.c | 13 ++++++-------
net/dsa/port.c | 17 +++++++----------
net/dsa/slave.c | 2 +-
net/dsa/switch.c | 40 +++++++++++++++++-----------------------
6 files changed, 45 insertions(+), 56 deletions(-)
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 440b6aca22c7..1cd9c2461f0d 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -504,12 +504,11 @@ static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
static inline u32 dsa_user_ports(struct dsa_switch *ds)
{
+ struct dsa_port *dp;
u32 mask = 0;
- int p;
- for (p = 0; p < ds->num_ports; p++)
- if (dsa_is_user_port(ds, p))
- mask |= BIT(p);
+ dsa_switch_for_each_user_port(dp, ds)
+ mask |= BIT(dp->index);
return mask;
}
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 41f36ad8b0ec..ea5169e671ae 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -280,23 +280,22 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
}
#ifdef CONFIG_PM_SLEEP
-static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
+static bool dsa_port_is_initialized(const struct dsa_port *dp)
{
- const struct dsa_port *dp = dsa_to_port(ds, p);
-
return dp->type == DSA_PORT_TYPE_USER && dp->slave;
}
int dsa_switch_suspend(struct dsa_switch *ds)
{
- int i, ret = 0;
+ struct dsa_port *dp;
+ int ret = 0;
/* Suspend slave network devices */
- for (i = 0; i < ds->num_ports; i++) {
- if (!dsa_is_port_initialized(ds, i))
+ dsa_switch_for_each_port(dp, ds) {
+ if (!dsa_port_is_initialized(dp))
continue;
- ret = dsa_slave_suspend(dsa_to_port(ds, i)->slave);
+ ret = dsa_slave_suspend(dp->slave);
if (ret)
return ret;
}
@@ -310,7 +309,8 @@ EXPORT_SYMBOL_GPL(dsa_switch_suspend);
int dsa_switch_resume(struct dsa_switch *ds)
{
- int i, ret = 0;
+ struct dsa_port *dp;
+ int ret = 0;
if (ds->ops->resume)
ret = ds->ops->resume(ds);
@@ -319,11 +319,11 @@ int dsa_switch_resume(struct dsa_switch *ds)
return ret;
/* Resume slave network devices */
- for (i = 0; i < ds->num_ports; i++) {
- if (!dsa_is_port_initialized(ds, i))
+ dsa_switch_for_each_port(dp, ds) {
+ if (!dsa_port_is_initialized(dp))
continue;
- ret = dsa_slave_resume(dsa_to_port(ds, i)->slave);
+ ret = dsa_slave_resume(dp->slave);
if (ret)
return ret;
}
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 691d27498b24..1c09182b3644 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -802,17 +802,16 @@ static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds)
{
const struct dsa_device_ops *tag_ops = ds->dst->tag_ops;
struct dsa_switch_tree *dst = ds->dst;
- int port, err;
+ struct dsa_port *cpu_dp;
+ int err;
if (tag_ops->proto == dst->default_proto)
return 0;
- for (port = 0; port < ds->num_ports; port++) {
- if (!dsa_is_cpu_port(ds, port))
- continue;
-
+ dsa_switch_for_each_cpu_port(cpu_dp, ds) {
rtnl_lock();
- err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto);
+ err = ds->ops->change_tag_protocol(ds, cpu_dp->index,
+ tag_ops->proto);
rtnl_unlock();
if (err) {
dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n",
@@ -1150,7 +1149,7 @@ int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
goto out_unlock;
list_for_each_entry(dp, &dst->ports, list) {
- if (!dsa_is_user_port(dp->ds, dp->index))
+ if (!dsa_port_is_user(dp))
continue;
if (dp->slave->flags & IFF_UP)
diff --git a/net/dsa/port.c b/net/dsa/port.c
index 616330a16d31..3b14c9b6a922 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -515,7 +515,8 @@ static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
struct netlink_ext_ack *extack)
{
struct dsa_switch *ds = dp->ds;
- int err, i;
+ struct dsa_port *other_dp;
+ int err;
/* VLAN awareness was off, so the question is "can we turn it on".
* We may have had 8021q uppers, those need to go. Make sure we don't
@@ -557,10 +558,10 @@ static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
* different ports of the same switch device and one of them has a
* different setting than what is being requested.
*/
- for (i = 0; i < ds->num_ports; i++) {
+ dsa_switch_for_each_port(other_dp, ds) {
struct net_device *other_bridge;
- other_bridge = dsa_to_port(ds, i)->bridge_dev;
+ other_bridge = other_dp->bridge_dev;
if (!other_bridge)
continue;
/* If it's the same bridge, it also has same
@@ -607,20 +608,16 @@ int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
return err;
if (ds->vlan_filtering_is_global) {
- int port;
+ struct dsa_port *other_dp;
ds->vlan_filtering = vlan_filtering;
- for (port = 0; port < ds->num_ports; port++) {
- struct net_device *slave;
-
- if (!dsa_is_user_port(ds, port))
- continue;
+ dsa_switch_for_each_user_port(other_dp, ds) {
+ struct net_device *slave = dp->slave;
/* We might be called in the unbind path, so not
* all slave devices might still be registered.
*/
- slave = dsa_to_port(ds, port)->slave;
if (!slave)
continue;
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 499f8d18c76d..9d9fef668eba 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -2368,7 +2368,7 @@ static int dsa_slave_netdevice_event(struct notifier_block *nb,
dst = cpu_dp->ds->dst;
list_for_each_entry(dp, &dst->ports, list) {
- if (!dsa_is_user_port(dp->ds, dp->index))
+ if (!dsa_port_is_user(dp))
continue;
list_add(&dp->slave->close_list, &close_list);
diff --git a/net/dsa/switch.c b/net/dsa/switch.c
index 6466d0539af9..19651674c8c7 100644
--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -17,14 +17,11 @@
static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
unsigned int ageing_time)
{
- int i;
-
- for (i = 0; i < ds->num_ports; ++i) {
- struct dsa_port *dp = dsa_to_port(ds, i);
+ struct dsa_port *dp;
+ dsa_switch_for_each_port(dp, ds)
if (dp->ageing_time && dp->ageing_time < ageing_time)
ageing_time = dp->ageing_time;
- }
return ageing_time;
}
@@ -120,7 +117,8 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
struct netlink_ext_ack extack = {0};
bool change_vlan_filtering = false;
bool vlan_filtering;
- int err, port;
+ struct dsa_port *dp;
+ int err;
if (dst->index == info->tree_index && ds->index == info->sw_index &&
ds->ops->port_bridge_leave)
@@ -150,10 +148,10 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
* VLAN-aware bridge.
*/
if (change_vlan_filtering && ds->vlan_filtering_is_global) {
- for (port = 0; port < ds->num_ports; port++) {
+ dsa_switch_for_each_port(dp, ds) {
struct net_device *bridge_dev;
- bridge_dev = dsa_to_port(ds, port)->bridge_dev;
+ bridge_dev = dp->bridge_dev;
if (bridge_dev && br_vlan_enabled(bridge_dev)) {
change_vlan_filtering = false;
@@ -579,38 +577,34 @@ static int dsa_switch_change_tag_proto(struct dsa_switch *ds,
struct dsa_notifier_tag_proto_info *info)
{
const struct dsa_device_ops *tag_ops = info->tag_ops;
- int port, err;
+ struct dsa_port *dp, *cpu_dp;
+ int err;
if (!ds->ops->change_tag_protocol)
return -EOPNOTSUPP;
ASSERT_RTNL();
- for (port = 0; port < ds->num_ports; port++) {
- if (!dsa_is_cpu_port(ds, port))
- continue;
-
- err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto);
+ dsa_switch_for_each_cpu_port(cpu_dp, ds) {
+ err = ds->ops->change_tag_protocol(ds, cpu_dp->index,
+ tag_ops->proto);
if (err)
return err;
- dsa_port_set_tag_protocol(dsa_to_port(ds, port), tag_ops);
+ dsa_port_set_tag_protocol(cpu_dp, tag_ops);
}
/* Now that changing the tag protocol can no longer fail, let's update
* the remaining bits which are "duplicated for faster access", and the
* bits that depend on the tagger, such as the MTU.
*/
- for (port = 0; port < ds->num_ports; port++) {
- if (dsa_is_user_port(ds, port)) {
- struct net_device *slave;
+ dsa_switch_for_each_user_port(dp, ds) {
+ struct net_device *slave = dp->slave;
- slave = dsa_to_port(ds, port)->slave;
- dsa_slave_setup_tagger(slave);
+ dsa_slave_setup_tagger(slave);
- /* rtnl_mutex is held in dsa_tree_change_tag_proto */
- dsa_slave_change_mtu(slave, slave->mtu);
- }
+ /* rtnl_mutex is held in dsa_tree_change_tag_proto */
+ dsa_slave_change_mtu(slave, slave->mtu);
}
return 0;
--
2.25.1
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