From: Sasha Levin <sashal@kernel•org>
To: linux-kernel@vger•kernel.org, stable@vger•kernel.org
Cc: Jisheng Zhang <jszhang@kernel•org>,
"David S . Miller" <davem@davemloft•net>,
Sasha Levin <sashal@kernel•org>,
peppe.cavallaro@st•com, alexandre.torgue@foss•st.com,
joabreu@synopsys•com, kuba@kernel•org, mcoquelin.stm32@gmail•com,
netdev@vger•kernel.org, linux-stm32@st-md-mailman•stormreply.com,
linux-arm-kernel@lists•infradead.org
Subject: [PATCH AUTOSEL 5.16 35/52] net: stmmac: reduce unnecessary wakeups from eee sw timer
Date: Thu, 3 Feb 2022 15:29:29 -0500 [thread overview]
Message-ID: <20220203202947.2304-35-sashal@kernel.org> (raw)
In-Reply-To: <20220203202947.2304-1-sashal@kernel.org>
From: Jisheng Zhang <jszhang@kernel•org>
[ Upstream commit c74ead223deb88bdf18af8c772d7ca5a9b6c3c2b ]
Currently, on EEE capable platforms, if EEE SW timer is used, the SW
timer cause 1 wakeup/s even if the TX has successfully entered EEE.
Remove this unnecessary wakeup by only calling mod_timer() if we
haven't successfully entered EEE.
Signed-off-by: Jisheng Zhang <jszhang@kernel•org>
Signed-off-by: David S. Miller <davem@davemloft•net>
Signed-off-by: Sasha Levin <sashal@kernel•org>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e81a79845d425..a361ad8e863ae 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -400,7 +400,7 @@ static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
* Description: this function is to verify and enter in LPI mode in case of
* EEE.
*/
-static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
+static int stmmac_enable_eee_mode(struct stmmac_priv *priv)
{
u32 tx_cnt = priv->plat->tx_queues_to_use;
u32 queue;
@@ -410,13 +410,14 @@ static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
struct stmmac_tx_queue *tx_q = &priv->tx_queue[queue];
if (tx_q->dirty_tx != tx_q->cur_tx)
- return; /* still unfinished work */
+ return -EBUSY; /* still unfinished work */
}
/* Check and enter in LPI mode */
if (!priv->tx_path_in_lpi_mode)
stmmac_set_eee_mode(priv, priv->hw,
priv->plat->en_tx_lpi_clockgating);
+ return 0;
}
/**
@@ -448,8 +449,8 @@ 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(priv->tx_lpi_timer));
+ if (stmmac_enable_eee_mode(priv))
+ mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
}
/**
@@ -2640,8 +2641,8 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)
if (priv->eee_enabled && !priv->tx_path_in_lpi_mode &&
priv->eee_sw_timer_en) {
- stmmac_enable_eee_mode(priv);
- mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
+ if (stmmac_enable_eee_mode(priv))
+ 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 */
--
2.34.1
next prev parent reply other threads:[~2022-02-03 20:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220203202947.2304-1-sashal@kernel.org>
2022-02-03 20:28 ` [PATCH AUTOSEL 5.16 05/52] netfilter: nf_conntrack_netbios_ns: fix helper module alias Sasha Levin
2022-02-03 21:46 ` Jakub Kicinski
2022-02-03 22:23 ` Florian Westphal
2022-02-11 14:41 ` Sasha Levin
2022-02-03 20:29 ` [PATCH AUTOSEL 5.16 11/52] SUNRPC allow for unspecified transport time in rpc_clnt_add_xprt Sasha Levin
2022-02-03 20:29 ` [PATCH AUTOSEL 5.16 12/52] net/sunrpc: fix reference count leaks in rpc_sysfs_xprt_state_change Sasha Levin
2022-02-03 20:29 ` [PATCH AUTOSEL 5.16 13/52] sunrpc: Fix potential race conditions in rpc_sysfs_xprt_state_change() Sasha Levin
2022-02-03 20:29 ` [PATCH AUTOSEL 5.16 21/52] net: sched: Clarify error message when qdisc kind is unknown Sasha Levin
2022-02-03 20:29 ` Sasha Levin [this message]
2022-02-03 20:29 ` [PATCH AUTOSEL 5.16 45/52] net: stmmac: dwmac-sun8i: use return val of readl_poll_timeout() Sasha Levin
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