[PATCH v2 net-next 2/7] net: stmmac: Setup a default RX Coalesce value instead of the minimum

[Jose Abreu]

For performance reasons, sometimes using the minimum RX Coalesce value
is not optimal. Lets setup a default value that is optimal in most of
the use cases.

Signed-off-by: Jose Abreu <Jose.Abreu@xxxxxxxxxxxx>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/net/ethernet/stmicro/stmmac/common.h      | 1 +
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 ++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 912bbb6515b2..309ea12ea61f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -248,6 +248,7 @@ struct stmmac_safety_stats {
 /* Max/Min RI Watchdog Timer count value */
 #define MAX_DMA_RIWT		0xff
 #define MIN_DMA_RIWT		0x10
+#define DEF_DMA_RIWT		0xa0
 /* Tx coalesce parameters */
 #define STMMAC_COAL_TX_TIMER	1000
 #define STMMAC_MAX_COAL_TX_TICK	100000
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7939ef7e23b7..400fbb727fd5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2605,9 +2605,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
 
 	if (priv->use_riwt) {
-		ret = stmmac_rx_watchdog(priv, priv->ioaddr, MIN_DMA_RIWT, rx_cnt);
-		if (!ret)
-			priv->rx_riwt = MIN_DMA_RIWT;
+		if (!priv->rx_riwt)
+			priv->rx_riwt = DEF_DMA_RIWT;
+
+		ret = stmmac_rx_watchdog(priv, priv->ioaddr, priv->rx_riwt, rx_cnt);
 	}
 
 	if (priv->hw->pcs)
-- 
2.7.4