netdev - [PATCH net] net: stmmac: Disable Tx queues when reconfiguring the interface

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Message-Id: <20211123185448.335924-1-yannick.vignon@oss.nxp.com>
Date:   Tue, 23 Nov 2021 19:54:48 +0100
From:   Yannick Vignon <yannick.vignon@....nxp.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, Xiaoliang Yang <xiaoliang.yang_1@....com>,
        Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        sebastien.laveze@....nxp.com
Cc:     Yannick Vignon <yannick.vignon@....com>
Subject: [PATCH net] net: stmmac: Disable Tx queues when reconfiguring the interface

From: Yannick Vignon <yannick.vignon@....com>

The Tx queues were not disabled in cases where the driver needed to stop
the interface to apply a new configuration. This could result in a kernel
panic when doing any of the 3 following actions:
* reconfiguring the number of queues (ethtool -L)
* reconfiguring the size of the ring buffers (ethtool -G)
* installing/removing an XDP program (ip l set dev ethX xdp)

Prevent the panic by making sure netif_tx_disable is called when stopping
an interface.

Without this patch, the following kernel panic can be observed when loading
an XDP program:

Unable to handle kernel paging request at virtual address ffff80001238d040
[....]
 Call trace:
  dwmac4_set_addr+0x8/0x10
  dev_hard_start_xmit+0xe4/0x1ac
  sch_direct_xmit+0xe8/0x39c
  __dev_queue_xmit+0x3ec/0xaf0
  dev_queue_xmit+0x14/0x20
[...]
[ end trace 0000000000000002 ]---

Fixes: 78cb988d36b6 ("net: stmmac: Add initial XDP support")
Signed-off-by: Yannick Vignon <yannick.vignon@....com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index f12097c8a485..748195697e5a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3802,6 +3802,8 @@ int stmmac_release(struct net_device *dev)
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
+	netif_tx_disable(dev);
+
 	if (device_may_wakeup(priv->device))
 		phylink_speed_down(priv->phylink, false);
 	/* Stop and disconnect the PHY */
-- 
2.25.1