[PATCH net] net: stmmac: Set MAC's flow control register to reflect current settings

From: Goh, Wei Sheng
Date: Fri Nov 18 2022 - 02:22:52 EST


Currently, pause frame register GMAC_RX_FLOW_CTRL_RFE is not updated
correctly when 'ethtool -A <IFACE> autoneg off rx off tx off' command
is issued. This fix ensures the flow control change is reflected directly
in the GMAC_RX_FLOW_CTRL_RFE register.

Fixes: 46f69ded988d ("net: stmmac: Use resolved link config in mac_link_up()")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.10.x
Signed-off-by: Goh, Wei Sheng <wei.sheng.goh@xxxxxxxxx>
Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@xxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 3 +++
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 ++++++++++--
2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index c25bfecb4a2d..369db308b1dd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -748,6 +748,9 @@ static void dwmac4_flow_ctrl(struct mac_device_info *hw, unsigned int duplex,
if (fc & FLOW_RX) {
pr_debug("\tReceive Flow-Control ON\n");
flow |= GMAC_RX_FLOW_CTRL_RFE;
+ } else {
+ pr_debug("\tReceive Flow-Control OFF\n");
+ flow &= ~GMAC_RX_FLOW_CTRL_RFE;
}
writel(flow, ioaddr + GMAC_RX_FLOW_CTRL);

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8273e6a175c8..ab7f48f32f5b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1061,8 +1061,16 @@ static void stmmac_mac_link_up(struct phylink_config *config,
ctrl |= priv->hw->link.duplex;

/* Flow Control operation */
- if (tx_pause && rx_pause)
- stmmac_mac_flow_ctrl(priv, duplex);
+ if (rx_pause && tx_pause)
+ priv->flow_ctrl = FLOW_AUTO;
+ else if (rx_pause && !tx_pause)
+ priv->flow_ctrl = FLOW_RX;
+ else if (!rx_pause && tx_pause)
+ priv->flow_ctrl = FLOW_TX;
+ else if (!rx_pause && !tx_pause)
+ priv->flow_ctrl = FLOW_OFF;
+
+ stmmac_mac_flow_ctrl(priv, duplex);

if (ctrl != old_ctrl)
writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
--
2.17.1