netdev - Re: [PATCH net-next 1/5] net: ipqess: introduce the Qualcomm IPQESS driver

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Date:   Tue, 26 Apr 2022 15:59:18 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, thomas.petazzoni@...tlin.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Vladimir Oltean <vladimir.oltean@....com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next 1/5] net: ipqess: introduce the Qualcomm IPQESS
 driver

Hello Andrew,

On Fri, 22 Apr 2022 22:19:43 +0200
Andrew Lunn <andrew@...n.ch> wrote:

Thanks for the review :)

> > +static int ipqess_axi_probe(struct platform_device *pdev)
> > +{
> > +	struct device_node *np = pdev->dev.of_node;
> > +	struct net_device *netdev;
> > +	phy_interface_t phy_mode;
> > +	struct resource *res;
> > +	struct ipqess *ess;
> > +	int i, err = 0;
> > +
> > +	netdev = devm_alloc_etherdev_mqs(&pdev->dev, sizeof(struct
> > ipqess),
> > +					 IPQESS_NETDEV_QUEUES,
> > +					 IPQESS_NETDEV_QUEUES);
> > +	if (!netdev)
> > +		return -ENOMEM;
> > +
> > +	ess = netdev_priv(netdev);
> > +	ess->netdev = netdev;
> > +	ess->pdev = pdev;
> > +	spin_lock_init(&ess->stats_lock);
> > +	SET_NETDEV_DEV(netdev, &pdev->dev);
> > +	platform_set_drvdata(pdev, netdev);  
> 
> ....
> 
> > +
> > +	ipqess_set_ethtool_ops(netdev);
> > +
> > +	err = register_netdev(netdev);
> > +	if (err)
> > +		goto err_out;  
> 
> Before register_netdev() even returns, your devices can be in use, the
> open callback called and packets sent. This is particularly true for
> NFS root. Which means any setup done after this is probably wrong.

Nice catch, thank you !

> > +
> > +	err = ipqess_hw_init(ess);
> > +	if (err)
> > +		goto err_out;
> > +
> > +	for (i = 0; i < IPQESS_NETDEV_QUEUES; i++) {
> > +		int qid;
> > +
> > +		netif_tx_napi_add(netdev, &ess->tx_ring[i].napi_tx,
> > +				  ipqess_tx_napi, 64);
> > +		netif_napi_add(netdev,
> > +			       &ess->rx_ring[i].napi_rx,
> > +			       ipqess_rx_napi, 64);
> > +
> > +		qid = ess->tx_ring[i].idx;
> > +		err = devm_request_irq(&ess->netdev->dev,
> > ess->tx_irq[qid],
> > +				       ipqess_interrupt_tx, 0,
> > +				       ess->tx_irq_names[qid],
> > +				       &ess->tx_ring[i]);
> > +		if (err)
> > +			goto err_out;
> > +
> > +		qid = ess->rx_ring[i].idx;
> > +		err = devm_request_irq(&ess->netdev->dev,
> > ess->rx_irq[qid],
> > +				       ipqess_interrupt_rx, 0,
> > +				       ess->rx_irq_names[qid],
> > +				       &ess->rx_ring[i]);
> > +		if (err)
> > +			goto err_out;
> > +	}  
> 
> All this should probably go before netdev_register().

I'll fix this for V2.

> > +static int ipqess_get_strset_count(struct net_device *netdev, int
> > sset) +{
> > +	switch (sset) {
> > +	case ETH_SS_STATS:
> > +		return ARRAY_SIZE(ipqess_stats);
> > +	default:
> > +		netdev_dbg(netdev, "%s: Invalid string set",
> > __func__);  
> 
> Unsupported would be better than invalid.

That's right, thanks

> > +		return -EOPNOTSUPP;
> > +	}
> > +}  
> 
>   Andrew

Best Regards,

Maxime