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Subject[PATCH v1 net] net: stmmac: Modify configuration method of EEE timers
Date
From: "Vineetha G. Jaya Kumaran" <vineetha.g.jaya.kumaran@intel.com>

Ethtool manual stated that the tx-timer is the "the amount of time the
device should stay in idle mode prior to asserting its Tx LPI". The
previous implementation for "ethtool --set-eee tx-timer" sets the LPI TW
timer duration which is not correct.

Hence, this patch fixes the the configuration of LPI TW timer via
module parameters instead of ethtool. And, "ethtool --set-eee tx-timer"
should configure EEE LPI timer.

Fixes: d765955d2ae0 ("stmmac: add the Energy Efficient Ethernet support")
Signed-off-by: Vineetha G. Jaya Kumaran <vineetha.g.jaya.kumaran@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
drivers/net/ethernet/stmicro/stmmac/common.h | 1 +
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
.../ethernet/stmicro/stmmac/stmmac_ethtool.c | 12 ++++++-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 35 +++++++++++--------
4 files changed, 33 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 127f75862962..7338babfebad 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -395,6 +395,7 @@ struct dma_features {
/* Default LPI timers */
#define STMMAC_DEFAULT_LIT_LS 0x3E8
#define STMMAC_DEFAULT_TWT_LS 0x1E
+#define STMMAC_TWT_MAX 0xFFFF

#define STMMAC_CHAIN_MODE 0x1
#define STMMAC_RING_MODE 0x2
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 9c02fc754bf1..d5a83c45510e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -203,6 +203,7 @@ struct stmmac_priv {
int eee_enabled;
int eee_active;
int tx_lpi_timer;
+ int tx_lpi_enabled;
unsigned int mode;
unsigned int chain_mode;
int extend_desc;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 430a4b32ec1e..348bb8a9cf7f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -665,6 +665,7 @@ static int stmmac_ethtool_op_get_eee(struct net_device *dev,
edata->eee_enabled = priv->eee_enabled;
edata->eee_active = priv->eee_active;
edata->tx_lpi_timer = priv->tx_lpi_timer;
+ edata->tx_lpi_enabled = priv->tx_lpi_enabled;

return phylink_ethtool_get_eee(priv->phylink, edata);
}
@@ -678,6 +679,10 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
if (!priv->dma_cap.eee)
return -EOPNOTSUPP;

+ if (priv->tx_lpi_enabled != edata->tx_lpi_enabled)
+ netdev_warn(priv->dev,
+ "Setting EEE tx-lpi is not supported\n");
+
if (!edata->eee_enabled)
stmmac_disable_eee_mode(priv);

@@ -685,7 +690,12 @@ static int stmmac_ethtool_op_set_eee(struct net_device *dev,
if (ret)
return ret;

- priv->tx_lpi_timer = edata->tx_lpi_timer;
+ if (edata->eee_enabled && priv->tx_lpi_enabled &&
+ priv->tx_lpi_timer != edata->tx_lpi_timer) {
+ priv->tx_lpi_timer = edata->tx_lpi_timer;
+ stmmac_eee_init(priv);
+ }
+
return 0;
}

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 89b2b3472852..2d1b9b76d678 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -90,11 +90,12 @@ static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
NETIF_MSG_LINK | NETIF_MSG_IFUP |
NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);

-#define STMMAC_DEFAULT_LPI_TIMER 1000
-static int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
-module_param(eee_timer, int, 0644);
-MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
-#define STMMAC_LPI_T(x) (jiffies + msecs_to_jiffies(x))
+#define STMMAC_DEFAULT_LPI_TIMER 1000000
+#define STMMAC_LPI_T(x) (jiffies + usecs_to_jiffies(x))
+
+static int tw_timer = STMMAC_DEFAULT_TWT_LS;
+module_param(tw_timer, int, 0644);
+MODULE_PARM_DESC(tw_timer, "LPI TW timer value in msec");

/* By default the driver will use the ring mode to manage tx and rx descriptors,
* but allow user to force to use the chain instead of the ring
@@ -130,8 +131,8 @@ static void stmmac_verify_args(void)
flow_ctrl = FLOW_OFF;
if (unlikely((pause < 0) || (pause > 0xffff)))
pause = PAUSE_TIME;
- if (eee_timer < 0)
- eee_timer = STMMAC_DEFAULT_LPI_TIMER;
+ if (tw_timer < 0 || tw_timer > STMMAC_TWT_MAX)
+ tw_timer = STMMAC_DEFAULT_TWT_LS;
}

/**
@@ -370,7 +371,7 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
struct stmmac_priv *priv = from_timer(priv, t, eee_ctrl_timer);

stmmac_enable_eee_mode(priv);
- mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
+ mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
}

/**
@@ -403,7 +404,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
if (priv->eee_enabled) {
netdev_dbg(priv->dev, "disable EEE\n");
del_timer_sync(&priv->eee_ctrl_timer);
- stmmac_set_eee_timer(priv, priv->hw, 0, tx_lpi_timer);
+ stmmac_set_eee_timer(priv, priv->hw, 0, tw_timer);
}
mutex_unlock(&priv->lock);
return false;
@@ -411,11 +412,12 @@ bool stmmac_eee_init(struct stmmac_priv *priv)

if (priv->eee_active && !priv->eee_enabled) {
timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
- mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
- tx_lpi_timer);
+ tw_timer);
}

+ mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(tx_lpi_timer));
+
mutex_unlock(&priv->lock);
netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");
return true;
@@ -930,6 +932,7 @@ static void stmmac_mac_link_down(struct phylink_config *config,

stmmac_mac_set(priv, priv->ioaddr, false);
priv->eee_active = false;
+ priv->tx_lpi_enabled = false;
stmmac_eee_init(priv);
stmmac_set_eee_pls(priv, priv->hw, false);
}
@@ -1027,6 +1030,7 @@ static void stmmac_mac_link_up(struct phylink_config *config,
if (phy && priv->dma_cap.eee) {
priv->eee_active = phy_init_eee(phy, 1) >= 0;
priv->eee_enabled = stmmac_eee_init(priv);
+ priv->tx_lpi_enabled = priv->eee_enabled;
stmmac_set_eee_pls(priv, priv->hw, true);
}
}
@@ -2061,7 +2065,8 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)

if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
stmmac_enable_eee_mode(priv);
- mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
+ mod_timer(&priv->eee_ctrl_timer,
+ STMMAC_LPI_T(priv->tx_lpi_timer));
}

/* We still have pending packets, let's call for a new scheduling */
@@ -2694,7 +2699,7 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
netdev_warn(priv->dev, "PTP init failed\n");
}

- priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
+ priv->tx_lpi_timer = STMMAC_DEFAULT_LPI_TIMER;

if (priv->use_riwt) {
if (!priv->rx_riwt)
@@ -5255,8 +5260,8 @@ static int __init stmmac_cmdline_opt(char *str)
} else if (!strncmp(opt, "pause:", 6)) {
if (kstrtoint(opt + 6, 0, &pause))
goto err;
- } else if (!strncmp(opt, "eee_timer:", 10)) {
- if (kstrtoint(opt + 10, 0, &eee_timer))
+ } else if (!strncmp(opt, "tw_timer:", 10)) {
+ if (kstrtoint(opt + 10, 0, &tw_timer))
goto err;
} else if (!strncmp(opt, "chain_mode:", 11)) {
if (kstrtoint(opt + 11, 0, &chain_mode))
--
2.17.1
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