netdev - [PATCH net 1/1] net: stmmac: Fix VLAN filter delete timeout issue in Intel mGBE SGMII

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Date:   Fri,  5 Mar 2021 13:49:30 +0800
From:   Ong Boon Leong <boon.leong.ong@...el.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Voon Weifeng <weifeng.voon@...el.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>
Subject: [PATCH net 1/1] net: stmmac: Fix VLAN filter delete timeout issue in Intel mGBE SGMII

For Intel mGbE controller, MAC VLAN filter delete operation will time-out
if serdes power-down sequence happened first during driver remove() with
below message.

[82294.764958] intel-eth-pci 0000:00:1e.4 eth2: stmmac_dvr_remove: removing driver
[82294.778677] intel-eth-pci 0000:00:1e.4 eth2: Timeout accessing MAC_VLAN_Tag_Filter
[82294.779997] intel-eth-pci 0000:00:1e.4 eth2: failed to kill vid 0081/0
[82294.947053] intel-eth-pci 0000:00:1d.2 eth1: stmmac_dvr_remove: removing driver
[82295.002091] intel-eth-pci 0000:00:1d.1 eth0: stmmac_dvr_remove: removing driver

Therefore, we delay the serdes power-down to be after unregister_netdev()
which triggers the VLAN filter delete.

Fixes: b9663b7ca6ff ("net: stmmac: Enable SERDES power up/down sequence")
Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 0eba44e9c1f8..208cae344ffa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -5249,13 +5249,16 @@ int stmmac_dvr_remove(struct device *dev)
 	netdev_info(priv->dev, "%s: removing driver", __func__);
 
 	stmmac_stop_all_dma(priv);
+	stmmac_mac_set(priv, priv->ioaddr, false);
+	netif_carrier_off(ndev);
+	unregister_netdev(ndev);
 
+	/* Serdes power down needs to happen after VLAN filter
+	 * is deleted that is triggered by unregister_netdev().
+	 */
 	if (priv->plat->serdes_powerdown)
 		priv->plat->serdes_powerdown(ndev, priv->plat->bsp_priv);
 
-	stmmac_mac_set(priv, priv->ioaddr, false);
-	netif_carrier_off(ndev);
-	unregister_netdev(ndev);
 #ifdef CONFIG_DEBUG_FS
 	stmmac_exit_fs(ndev);
 #endif
-- 
2.17.0