netdev - Re: [PATCH net-next v5 3/6] net: bcmasp: Add support for ASP2.0 Ethernet controller

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Date: Thu, 25 May 2023 20:54:54 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Justin Chen <justin.chen@...adcom.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 bcm-kernel-feedback-list@...adcom.com, florian.fainelli@...adcom.com,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 opendmb@...il.com, andrew@...n.ch, hkallweit1@...il.com,
 linux@...linux.org.uk, richardcochran@...il.com, sumit.semwal@...aro.org,
 christian.koenig@....com, simon.horman@...igine.com
Subject: Re: [PATCH net-next v5 3/6] net: bcmasp: Add support for ASP2.0
 Ethernet controller

On Wed, 24 May 2023 16:01:50 -0700 Justin Chen wrote:
> Add support for the Broadcom ASP 2.0 Ethernet controller which is first
> introduced with 72165. This controller features two distinct Ethernet
> ports that can be independently operated.
> 
> This patch supports:
> 
> - Wake-on-LAN using magic packets
> - basic ethtool operations (link, counters, message level)
> - MAC destination address filtering (promiscuous, ALL_MULTI, etc.)

> +static netdev_tx_t bcmasp_xmit(struct sk_buff *skb, struct net_device *dev)
> +{
> +	struct bcmasp_intf *intf = netdev_priv(dev);
> +	int spb_index, nr_frags, ret, i, j;
> +	unsigned int total_bytes, size;
> +	struct bcmasp_tx_cb *txcb;
> +	dma_addr_t mapping, valid;
> +	struct bcmasp_desc *desc;
> +	bool csum_hw = false;
> +	struct device *kdev;
> +	skb_frag_t *frag;
> +
> +	kdev = &intf->parent->pdev->dev;
> +
> +	spin_lock(&intf->tx_lock);

What is the tx_lock for? netdevs already have a tx lock, unless you
declare the device as lockless.

> +static void bcmasp_tx_timeout(struct net_device *dev, unsigned int txqueue)
> +{
> +	struct bcmasp_intf *intf = netdev_priv(dev);
> +
> +	netif_dbg(intf, tx_err, dev, "transmit timeout!\n");
> +
> +	netif_trans_update(dev);
> +	dev->stats.tx_errors++;
> +
> +	netif_wake_queue(dev);

If the queue is full xmit will just put it back to sleep.
You want to try to reap completions if anything, no?

> +static struct net_device_stats *bcmasp_get_stats(struct net_device *dev)
> +{
> +	return &dev->stats;
> +}

you don't have to do this, core will use device stats if there's no ndo

> +	ndev = alloc_etherdev(sizeof(struct bcmasp_intf));
> +	if (!dev) {

*blink* condition is typo'ed

> +		dev_warn(dev, "%s: unable to alloc ndev\n", ndev_dn->name);
> +		goto err;
> +	}

-- 
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