[PATCH 6.0 086/124] net: stmmac: Set MACs flow control register to reflect current settings

Greg Kroah-Hartman
2022-12-05T19:26:37Z

From: Goh, Wei Sheng <wei.sheng.goh@intel.com>

commit cc3d2b5fc0d6f8ad8a52da5ea679e5c2ec2adbd4 upstream.

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@vger.kernel.org> # 5.10.x
Signed-off-by: Goh, Wei Sheng <wei.sheng.goh@intel.com>
Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 2 ++
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 ++++++++++--
2 files changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -749,6 +749,8 @@ static void dwmac4_flow_ctrl(struct mac_
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");
}
writel(flow, ioaddr + GMAC_RX_FLOW_CTRL);

--- 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 ph
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
+ priv->flow_ctrl = FLOW_OFF;
+
+ stmmac_mac_flow_ctrl(priv, duplex);

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