netdev - [PATCH net 1/1] net: stmmac: ensure tx function is not running in stmmac_xdp

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Date:   Thu, 10 Nov 2022 14:45:52 +0800
From:   Noor Azura Ahmad Tarmizi 
        <noor.azura.ahmad.tarmizi@...ux.intel.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, Song Yoong Siang <yoong.siang.song@...el.com>,
        Mohd Faizal Abdul Rahim <faizal.abdul.rahim@...el.com>
Subject: [PATCH net 1/1] net: stmmac: ensure tx function is not running in stmmac_xdp_release()

From: Mohd Faizal Abdul Rahim <faizal.abdul.rahim@...el.com>

When stmmac_xdp_release() is called, there is a possibility that tx
function is still running on other queues which will lead to tx queue
timed out and reset adapter.

This commit ensure that tx function is not running xdp before release
flow continue to run.

Fixes: ac746c8520d9 ("net: stmmac: enhance XDP ZC driver level switching performance")
Signed-off-by: Song Yoong Siang <yoong.siang.song@...el.com>
Signed-off-by: Mohd Faizal Abdul Rahim <faizal.abdul.rahim@...el.com>
Signed-off-by: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 8273e6a175c8..6b43da78cdf0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -6548,6 +6548,9 @@ void stmmac_xdp_release(struct net_device *dev)
 	struct stmmac_priv *priv = netdev_priv(dev);
 	u32 chan;
 
+	/* Ensure tx function is not running */
+	netif_tx_disable(dev);
+
 	/* Disable NAPI process */
 	stmmac_disable_all_queues(priv);
 
-- 
2.17.1