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generic: ar8216: add mib_poll_interval switch attribute

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This allows specifying interval of polling MIB counters from userspace
and allow completely turning off MIB counter support by setting
mib_poll_interval to 0.

Since MIB counter polling is a heavy CPU load for GPIO emulated MDIO
bus, disable this behavior by default. Those who wants to use swconfig
LEDs can enable them with qca,mib-poll-interval dts property or with
swconfig command.

Fixes: FS#2230 ("kworker spikes 100% cpu every 2 second.")
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
v19.07.3_mercusys_ac12_duma
Chuanhong Guo 5 years ago committed by Petr Štetiar
parent df6e8c8771
commit 107dc4326c
3 changed files with 63 additions and 8 deletions
Show Stats Download Patch File Download Diff File

56
target/linux/generic/files/drivers/net/phy/ar8216.c
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@ -42,8 +42,6 @@
extern const struct ar8xxx_chip ar8327_chip;
extern const struct ar8xxx_chip ar8337_chip;
#define AR8XXX_MIB_WORK_DELAY 2000 /* msecs */
#define MIB_DESC(_s , _o, _n) \
{ \
.size = (_s), \
@ -136,6 +134,11 @@ const struct ar8xxx_mib_desc ar8236_mibs[39] = {
static DEFINE_MUTEX(ar8xxx_dev_list_lock);
static LIST_HEAD(ar8xxx_dev_list);
static void
ar8xxx_mib_start(struct ar8xxx_priv *priv);
static void
ar8xxx_mib_stop(struct ar8xxx_priv *priv);
/* inspired by phy_poll_reset in drivers/net/phy/phy_device.c */
static int
ar8xxx_phy_poll_reset(struct mii_bus *bus)
@ -1444,6 +1447,36 @@ unlock:
return ret;
}
int
ar8xxx_sw_set_mib_poll_interval(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val)
{
struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
if (!ar8xxx_has_mib_counters(priv))
return -EOPNOTSUPP;
ar8xxx_mib_stop(priv);
priv->mib_poll_interval = val->value.i;
ar8xxx_mib_start(priv);
return 0;
}
int
ar8xxx_sw_get_mib_poll_interval(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val)
{
struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
if (!ar8xxx_has_mib_counters(priv))
return -EOPNOTSUPP;
val->value.i = priv->mib_poll_interval;
return 0;
}
int
ar8xxx_sw_set_mirror_rx_enable(struct switch_dev *dev,
const struct switch_attr *attr,
@ -1615,7 +1648,7 @@ ar8xxx_sw_get_port_mib(struct switch_dev *dev,
int i, len = 0;
bool mib_stats_empty = true;
if (!ar8xxx_has_mib_counters(priv))
if (!ar8xxx_has_mib_counters(priv) || !priv->mib_poll_interval)
return -EOPNOTSUPP;
port = val->port_vlan;
@ -1807,7 +1840,7 @@ ar8xxx_sw_get_port_stats(struct switch_dev *dev, int port,
struct ar8xxx_priv *priv = swdev_to_ar8xxx(dev);
u64 *mib_stats;
if (!ar8xxx_has_mib_counters(priv))
if (!ar8xxx_has_mib_counters(priv) || !priv->mib_poll_interval)
return -EOPNOTSUPP;
if (!(priv->chip->mib_rxb_id || priv->chip->mib_txb_id))
@ -1857,6 +1890,13 @@ static const struct switch_attr ar8xxx_sw_attr_globals[] = {
.description = "Reset all MIB counters",
.set = ar8xxx_sw_set_reset_mibs,
},
{
.type = SWITCH_TYPE_INT,
.name = "ar8xxx_mib_poll_interval",
.description = "MIB polling interval in msecs (0 to disable)",
.set = ar8xxx_sw_set_mib_poll_interval,
.get = ar8xxx_sw_get_mib_poll_interval
},
{
.type = SWITCH_TYPE_INT,
.name = "enable_mirror_rx",
@ -2234,7 +2274,7 @@ ar8xxx_mib_init(struct ar8xxx_priv *priv)
static void
ar8xxx_mib_start(struct ar8xxx_priv *priv)
{
if (!ar8xxx_has_mib_counters(priv))
if (!ar8xxx_has_mib_counters(priv) || !priv->mib_poll_interval)
return;
schedule_delayed_work(&priv->mib_work,
@ -2244,7 +2284,7 @@ ar8xxx_mib_start(struct ar8xxx_priv *priv)
static void
ar8xxx_mib_stop(struct ar8xxx_priv *priv)
{
if (!ar8xxx_has_mib_counters(priv))
if (!ar8xxx_has_mib_counters(priv) || !priv->mib_poll_interval)
return;
cancel_delayed_work_sync(&priv->mib_work);
@ -2516,7 +2556,7 @@ ar8xxx_phy_probe(struct phy_device *phydev)
ret = of_property_read_u32(priv->pdev->of_node, "qca,mib-poll-interval",
&priv->mib_poll_interval);
if (ret)
priv->mib_poll_interval = AR8XXX_MIB_WORK_DELAY;
priv->mib_poll_interval = 0;
ret = ar8xxx_id_chip(priv);
if (ret)
@ -2688,7 +2728,7 @@ ar8xxx_mdiodev_probe(struct mdio_device *mdiodev)
ret = of_property_read_u32(priv->pdev->of_node, "qca,mib-poll-interval",
&priv->mib_poll_interval);
if (ret)
priv->mib_poll_interval = AR8XXX_MIB_WORK_DELAY;
priv->mib_poll_interval = 0;
ret = ar8xxx_read_id(priv);
if (ret)

8
target/linux/generic/files/drivers/net/phy/ar8216.h
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@ -544,6 +544,14 @@ ar8xxx_sw_set_reset_mibs(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val);
int
ar8xxx_sw_set_mib_poll_interval(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val);
int
ar8xxx_sw_get_mib_poll_interval(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val);
int
ar8xxx_sw_set_mirror_rx_enable(struct switch_dev *dev,
const struct switch_attr *attr,
struct switch_val *val);

7
target/linux/generic/files/drivers/net/phy/ar8327.c
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@ -1321,6 +1321,13 @@ static const struct switch_attr ar8327_sw_attr_globals[] = {
.description = "Reset all MIB counters",
.set = ar8xxx_sw_set_reset_mibs,
},
{
.type = SWITCH_TYPE_INT,
.name = "ar8xxx_mib_poll_interval",
.description = "MIB polling interval in msecs (0 to disable)",
.set = ar8xxx_sw_set_mib_poll_interval,
.get = ar8xxx_sw_get_mib_poll_interval
},
{
.type = SWITCH_TYPE_INT,
.name = "enable_mirror_rx",

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