netdev - [PATCH stable 4.9 v3] net: dsa: bcm_sf2: force pause link settings

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Message-Id: <20220708001405.1743251-1-f.fainelli@gmail.com>
Date:   Thu,  7 Jul 2022 17:14:04 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     stable@...r.kernel.org
Cc:     Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        olteanv@...il.com, andrew@...n.ch
Subject: [PATCH stable 4.9 v3] net: dsa: bcm_sf2: force pause link settings

From: Doug Berger <opendmb@...il.com>

commit 7c97bc0128b2eecc703106112679a69d446d1a12 upstream

The pause settings reported by the PHY should also be applied to the
GMII port status override otherwise the switch will not generate pause
frames towards the link partner despite the advertisement saying
otherwise.

Fixes: 246d7f773c13 ("net: dsa: add Broadcom SF2 switch driver")
Signed-off-by: Doug Berger <opendmb@...il.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Link: https://lore.kernel.org/r/20220623030204.1966851-1-f.fainelli@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
Changes in v3:

- gate the flow control enabling to links that are auto-negotiated and
  in full duplex

Changes in v2:

- use both local and remote advertisement to determine when to apply
  flow control settings

 drivers/net/dsa/bcm_sf2.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 40b3adf7ad99..f3d61f2bb0f7 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -600,7 +600,9 @@ static void bcm_sf2_sw_adjust_link(struct dsa_switch *ds, int port,
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
 	struct ethtool_eee *p = &priv->port_sts[port].eee;
 	u32 id_mode_dis = 0, port_mode;
+	u16 lcl_adv = 0, rmt_adv = 0;
 	const char *str = NULL;
+	u8 flowctrl = 0;
 	u32 reg;
 
 	switch (phydev->interface) {
@@ -667,10 +669,27 @@ static void bcm_sf2_sw_adjust_link(struct dsa_switch *ds, int port,
 		break;
 	}
 
+	if (phydev->duplex == DUPLEX_FULL &&
+	    phydev->autoneg == AUTONEG_ENABLE) {
+		if (phydev->pause)
+			rmt_adv = LPA_PAUSE_CAP;
+		if (phydev->asym_pause)
+			rmt_adv |= LPA_PAUSE_ASYM;
+		if (phydev->advertising & ADVERTISED_Pause)
+			lcl_adv = ADVERTISE_PAUSE_CAP;
+		if (phydev->advertising & ADVERTISED_Asym_Pause)
+			lcl_adv |= ADVERTISE_PAUSE_ASYM;
+		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
+	}
+
 	if (phydev->link)
 		reg |= LINK_STS;
 	if (phydev->duplex == DUPLEX_FULL)
 		reg |= DUPLX_MODE;
+	if (flowctrl & FLOW_CTRL_TX)
+		reg |= TXFLOW_CNTL;
+	if (flowctrl & FLOW_CTRL_RX)
+		reg |= RXFLOW_CNTL;
 
 	core_writel(priv, reg, CORE_STS_OVERRIDE_GMIIP_PORT(port));
 
-- 
2.25.1