linux-kernel - Re: [PATCH net-next 3/3] net: stmmac: Convert to phylink and remove phylib logic

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Message-ID: <b66c7578-172f-4443-f4c3-411525e28738@nvidia.com>
Date:   Tue, 18 Jun 2019 11:18:53 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Convert to phylink and remove
 phylib logic


On 18/06/2019 10:46, Jose Abreu wrote:
> From: Jon Hunter <jonathanh@...dia.com>
> 
>> I am not certain but I don't believe so. We are using a static IP address
>> and mounting the root file-system via NFS when we see this ...
> 
> Can you please add a call to napi_synchronize() before every 
> napi_disable() calls, like this:
> 
> if (queue < rx_queues_cnt) {
> 	napi_synchronize(&ch->rx_napi);
> 	napi_disable(&ch->rx_napi);
> }
> 
> if (queue < tx_queues_cnt) {
> 	napi_synchronize(&ch->tx_napi);
> 	napi_disable(&ch->tx_napi);
> }
> 
> [ I can send you a patch if you prefer ]

Yes I can try this and for completeness you mean ...

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4ca46289a742..d4a12cb64d8e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -146,10 +146,15 @@ static void stmmac_disable_all_queues(struct stmmac_priv *priv)
        for (queue = 0; queue < maxq; queue++) {
                struct stmmac_channel *ch = &priv->channel[queue];
 
-               if (queue < rx_queues_cnt)
+               if (queue < rx_queues_cnt) {
+                       napi_synchronize(&ch->rx_napi);
                        napi_disable(&ch->rx_napi);
-               if (queue < tx_queues_cnt)
+               }
+
+               if (queue < tx_queues_cnt) {
+                       napi_synchronize(&ch->tx_napi);
                        napi_disable(&ch->tx_napi);
+               }
        }
 }

Cheers
Jon

-- 
nvpublic