netdev - Re: [PATCH v3 net-next 2/2] net: airoha: Introduce ethernet support for EN7581 SoC

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Date: Sun, 23 Jun 2024 19:56:23 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, nbd@....name, lorenzo.bianconi83@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, conor@...nel.org,
	linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, catalin.marinas@....com,
	will@...nel.org, upstream@...oha.com,
	angelogioacchino.delregno@...labora.com,
	benjamin.larsson@...exis.eu, rkannoth@...vell.com,
	sgoutham@...vell.com
Subject: Re: [PATCH v3 net-next 2/2] net: airoha: Introduce ethernet support
 for EN7581 SoC

> +static int airoha_fe_set_pse_oq_rsv(struct airoha_eth *eth,
> +				    u32 port, u32 queue, u32 val)
> +{
> +	u32 orig_val, tmp, all_rsv, fq_limit;
> +	const u32 pse_port_oq_id[] = {
> +		PSE_PORT0_QUEUE,
> +		PSE_PORT1_QUEUE,
> +		PSE_PORT2_QUEUE,
> +		PSE_PORT3_QUEUE,
> +		PSE_PORT4_QUEUE,
> +		PSE_PORT5_QUEUE,
> +		PSE_PORT6_QUEUE,
> +		PSE_PORT7_QUEUE,
> +		PSE_PORT8_QUEUE,
> +		PSE_PORT9_QUEUE,
> +		PSE_PORT10_QUEUE
> +	};

> +static void airoha_fe_oq_rsv_init(struct airoha_eth *eth)
> +{
> +	int i;
> +
> +	/* hw misses PPE2 oq rsv */
> +	airoha_fe_set(eth, REG_FE_PSE_BUF_SET,
> +		      PSE_DEF_RSV_PAGE * PSE_PORT8_QUEUE);
> +
> +	for (i = 0; i < PSE_PORT0_QUEUE; i++)
> +		airoha_fe_set_pse_oq_rsv(eth, 0, i, 0x40);
> +	for (i = 0; i < PSE_PORT1_QUEUE; i++)
> +		airoha_fe_set_pse_oq_rsv(eth, 1, i, 0x40);
> +
> +	for (i = 6; i < PSE_PORT2_QUEUE; i++)
> +		airoha_fe_set_pse_oq_rsv(eth, 2, i, 0);
> +
> +	for (i = 0; i < PSE_PORT3_QUEUE; i++)
> +		airoha_fe_set_pse_oq_rsv(eth, 3, i, 0x40);

Code like this is making me wounder about the split between MAC
driver, DSA driver and DSA tag driver. Or if it should actually be a
pure switchdev driver?

If there some open architecture documentation for this device?

What are these ports about?

> +static void airoha_qdma_clenaup_rx_queue(struct airoha_queue *q)

cleanup?

> +static int airoha_dev_open(struct net_device *dev)
> +{
> +	struct airoha_eth *eth = netdev_priv(dev);
> +	int err;
> +
> +	if (netdev_uses_dsa(dev))
> +		airoha_fe_set(eth, REG_GDM1_INGRESS_CFG, GDM1_STAG_EN_MASK);
> +	else
> +		airoha_fe_clear(eth, REG_GDM1_INGRESS_CFG, GDM1_STAG_EN_MASK);

Does that imply both instances of the GMAC are not connected to the
switch? Can one be used with a PHY?

	Andrew