linux-kernel - Re: [EXTERNAL] Re: [PATCH v9 2/2] net: ti: icssg-prueth: Add ICSSG ethernet driver

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Message-ID: <78c1a348-8dd7-032f-62ce-d0dad360972a@ti.com>
Date:   Tue, 18 Jul 2023 15:28:39 +0530
From:   Md Danish Anwar <a0501179@...com>
To:     Paolo Abeni <pabeni@...hat.com>,
        MD Danish Anwar <danishanwar@...com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Roger Quadros <rogerq@...nel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Andrew Lunn <andrew@...n.ch>,
        Richard Cochran <richardcochran@...il.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     <nm@...com>, <srk@...com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [EXTERNAL] Re: [PATCH v9 2/2] net: ti: icssg-prueth: Add ICSSG
 ethernet driver

Hi Paolo,

On 18/07/23 1:52 pm, Paolo Abeni wrote:
> On Fri, 2023-07-14 at 15:14 +0530, MD Danish Anwar wrote:
>> +static int prueth_netdev_init(struct prueth *prueth,
>> +			      struct device_node *eth_node)
>> +{
>> +	int ret, num_tx_chn = PRUETH_MAX_TX_QUEUES;
>> +	struct prueth_emac *emac;
>> +	struct net_device *ndev;
>> +	enum prueth_port port;
>> +	enum prueth_mac mac;
>> +
>> +	port = prueth_node_port(eth_node);
>> +	if (port == PRUETH_PORT_INVALID)
>> +		return -EINVAL;
>> +
>> +	mac = prueth_node_mac(eth_node);
>> +	if (mac == PRUETH_MAC_INVALID)
>> +		return -EINVAL;
>> +
>> +	ndev = alloc_etherdev_mq(sizeof(*emac), num_tx_chn);
>> +	if (!ndev)
>> +		return -ENOMEM;
>> +
>> +	emac = netdev_priv(ndev);
>> +	prueth->emac[mac] = emac;
>> +	emac->prueth = prueth;
>> +	emac->ndev = ndev;
>> +	emac->port_id = port;
>> +	emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
>> +	if (!emac->cmd_wq) {
>> +		ret = -ENOMEM;
>> +		goto free_ndev;
>> +	}
>> +	INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);
>> +
>> +	ret = pruss_request_mem_region(prueth->pruss,
>> +				       port == PRUETH_PORT_MII0 ?
>> +				       PRUSS_MEM_DRAM0 : PRUSS_MEM_DRAM1,
>> +				       &emac->dram);
>> +	if (ret) {
>> +		dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
>> +		ret = -ENOMEM;
>> +		goto free_wq;
>> +	}
>> +
>> +	emac->tx_ch_num = 1;
>> +
>> +	SET_NETDEV_DEV(ndev, prueth->dev);
>> +	spin_lock_init(&emac->lock);
>> +	mutex_init(&emac->cmd_lock);
>> +
>> +	emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
>> +	if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
>> +		dev_err(prueth->dev, "couldn't find phy-handle\n");
>> +		ret = -ENODEV;
>> +		goto free;
>> +	} else if (of_phy_is_fixed_link(eth_node)) {
>> +		ret = of_phy_register_fixed_link(eth_node);
>> +		if (ret) {
>> +			ret = dev_err_probe(prueth->dev, ret,
>> +					    "failed to register fixed-link phy\n");
>> +			goto free;
>> +		}
>> +
>> +		emac->phy_node = eth_node;
>> +	}
>> +
>> +	ret = of_get_phy_mode(eth_node, &emac->phy_if);
>> +	if (ret) {
>> +		dev_err(prueth->dev, "could not get phy-mode property\n");
>> +		goto free;
>> +	}
>> +
>> +	if (emac->phy_if != PHY_INTERFACE_MODE_MII &&
>> +	    !phy_interface_mode_is_rgmii(emac->phy_if)) {
>> +		dev_err(prueth->dev, "PHY mode unsupported %s\n", phy_modes(emac->phy_if));
>> +		ret = -EINVAL;
>> +		goto free;
>> +	}
>> +
>> +	/* AM65 SR2.0 has TX Internal delay always enabled by hardware
>> +	 * and it is not possible to disable TX Internal delay. The below
>> +	 * switch case block describes how we handle different phy modes
>> +	 * based on hardware restriction.
>> +	 */
>> +	switch (emac->phy_if) {
>> +	case PHY_INTERFACE_MODE_RGMII_ID:
>> +		emac->phy_if = PHY_INTERFACE_MODE_RGMII_RXID;
>> +		break;
>> +	case PHY_INTERFACE_MODE_RGMII_TXID:
>> +		emac->phy_if = PHY_INTERFACE_MODE_RGMII;
>> +		break;
>> +	case PHY_INTERFACE_MODE_RGMII:
>> +	case PHY_INTERFACE_MODE_RGMII_RXID:
>> +		dev_err(prueth->dev, "RGMII mode without TX delay is not supported");
>> +		return -EINVAL;
> 
> At this point ndev prueth->emac[mac] == emac, so the caller will try to
> clean it up via prueth_netdev_exit(), which in turn expects the device
> being fully initialized, while this is not. Notably the napi instance
> has not being registered yet.
> 
> You should 'goto free;' above and possibly move the 'ndev prueth-
>> emac[mac] = emac' assignment at the end of this function.
> 

Sure Paolo. Instead of returning -EINVAL in this switch case, I will do the
below change.

	ret = -EINVAL
	goto free;

Also I will move the 'ndev prueth-> emac[mac] = emac' assignment at the end of
this function.

Please let me know if you have any more comments / suggestions. I will try to
address them and send a next revision.

-- 
Thanks and Regards,
Danish.