linux-kernel - Re: [PATCH] Ethernet driver for the WIZnet W5300 chip

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Date:	Wed, 14 Mar 2012 16:37:05 +0100
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	Mike Sinkovsky <msink@...monline.ru>
Cc:	linux-netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Ethernet driver for the WIZnet W5300 chip

On 2012-03-14 at 14:00:35 +0100, Mike Sinkovsky <msink@...monline.ru> wrote:

[snip]

> +static int w5300_set_macaddr(struct net_device *ndev, void *addr)
> +{
> +	struct dev_private *priv = netdev_priv(ndev);
> +	struct sockaddr *sock_addr = addr;
> +
> +	if (is_multicast_ether_addr(sock_addr->sa_data))
> +		return -EADDRNOTAVAIL;

This should probably be

	if (!is_valid_ether_addr(sock_addr->sa_data))
		return -EADDRNOTAVAIL;

> +	memcpy(ndev->dev_addr, sock_addr->sa_data, ETH_ALEN);
> +	write_macaddr(priv);

You'll also want to reset NET_ADDR_RANDOM in ndev->addr_assign_type
since you seem to generate a random address in w5300_probe().

> +
> +	return 0;
> +}
> +

[snip]

> +static int __devinit w5300_probe(struct platform_device *pdev)
> +{
> +	struct net_device *ndev;
> +	struct dev_private *priv;
> +	struct resource *mem;
> +	void __iomem *mem_base;
> +	int mem_size;
> +	int irq;
> +	int err;
> +
> +	ndev = alloc_etherdev(sizeof(*priv));
> +	if (!ndev) {
> +		err = -ENOMEM;
> +		goto err_do_devfree;
> +	}
> +
> +	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	irq = platform_get_irq(pdev, 0);
> +	if (!mem || irq < 0) {
> +		err = -ENXIO;
> +		goto err_do_devfree;
> +	}
> +	mem_size = resource_size(mem);
> +
> +	if (!request_mem_region(mem->start, mem_size, KBUILD_MODNAME)) {
> +		err = -EBUSY;
> +		goto err_do_devfree;
> +	}
> +	mem_base = ioremap(mem->start, mem_size);
> +	if (!mem_base) {
> +		err = -ENOMEM;
> +		goto err_do_memrelease;
> +	}
> +
> +	SET_NETDEV_DEV(ndev, &pdev->dev);
> +	platform_set_drvdata(pdev, ndev);
> +	priv = netdev_priv(ndev);
> +	priv->ndev = ndev;
> +	priv->base = mem_base;
> +	priv->promisc_mode = false;
> +	spin_lock_init(&priv->reg_lock);
> +
> +	ndev->mem_start = mem->start;
> +	ndev->mem_end = mem->start + mem_size - 1;
> +	ndev->irq = irq;
> +	ndev->netdev_ops = &netdev_ops;
> +	ndev->watchdog_timeo = 2 * HZ;
> +	ether_setup(ndev);
> +	dev_hw_addr_random(ndev, ndev->dev_addr);

This is eth_hw_addr_random(ndev) in net-next now.

> +	reset_chip(priv);
> +	if (read_IDR(priv) != 0x5300) {
> +		err = -ENODEV;
> +		goto err_do_iounmap;
> +	}
> +
> +	err = request_irq(ndev->irq, w5300_start_rx,
> +			  IRQ_TYPE_LEVEL_LOW, ndev->name, ndev);
> +	if (err)
> +		goto err_do_iounmap;
> +
> +	netif_napi_add(ndev, &priv->napi, w5300_napi_poll, 16);
> +	err = register_netdev(ndev);
> +	if (err)
> +		goto err_do_irqfree;
> +
> +	netdev_info(ndev, "at 0x%lX irq %d\n", ndev->mem_start, ndev->irq);
> +	return 0;
> +
> +err_do_irqfree:
> +	free_irq(ndev->irq, ndev);
> +err_do_iounmap:
> +	iounmap(mem_base);
> +err_do_memrelease:
> +	release_mem_region(mem->start, resource_size(mem));
> +err_do_devfree:
> +	free_netdev(ndev);
> +	platform_set_drvdata(pdev, NULL);
> +	return err;
> +}
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