linux-kernel - Re: [PATCH net-next v2 03/14] net: ethernet: qualcomm: Add PPE driver for IPQ9574 SoC

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Message-ID: <29e742c9-82f5-41d5-a06f-70f010a3f39e@wanadoo.fr>
Date: Wed, 8 Jan 2025 20:19:17 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Luo Jie <quic_luoj@...cinc.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Lei Wei <quic_leiwei@...cinc.com>,
 Suruchi Agarwal <quic_suruchia@...cinc.com>,
 Pavithra R <quic_pavir@...cinc.com>, Simon Horman <horms@...nel.org>,
 Jonathan Corbet <corbet@....net>, Kees Cook <kees@...nel.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-hardening@...r.kernel.org,
 quic_kkumarcs@...cinc.com, quic_linchen@...cinc.com,
 srinivas.kandagatla@...aro.org, bartosz.golaszewski@...aro.org,
 john@...ozen.org
Subject: Re: [PATCH net-next v2 03/14] net: ethernet: qualcomm: Add PPE driver
 for IPQ9574 SoC

Le 08/01/2025 à 14:47, Luo Jie a écrit :
> The PPE (Packet Process Engine) hardware block is available
> on Qualcomm IPQ SoC that support PPE architecture, such as
> IPQ9574.
> 
> The PPE in IPQ9574 includes six integrated ethernet MAC
> (for 6 PPE ports), buffer management, queue management and
> scheduler functions. The MACs can connect with the external
> PHY or switch devices using the UNIPHY PCS block available
> in the SoC.
> 
> The PPE also includes various packet processing offload
> capabilities such as L3 routing and L2 bridging, VLAN and
> tunnel processing offload. It also includes Ethernet DMA
> function for transferring packets between ARM cores and
> PPE ethernet ports.
> 
> This patch adds the base source files and Makefiles for
> the PPE driver such as platform driver registration,
> clock initialization, and PPE reset routines.
> 
> Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
> ---

...

> +static int qcom_ppe_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct ppe_device *ppe_dev;
> +	void __iomem *base;
> +	int ret, num_icc;
> +
> +	num_icc = ARRAY_SIZE(ppe_icc_data);
> +	ppe_dev = devm_kzalloc(dev, struct_size(ppe_dev, icc_paths, num_icc),
> +			       GFP_KERNEL);
> +	if (!ppe_dev)
> +		return dev_err_probe(dev, -ENOMEM, "PPE alloc memory failed\n");

Usually, no error message in logged in case of devm_kzalloc().
It is already loud enough.

> +
> +	base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(base))
> +		return dev_err_probe(dev, PTR_ERR(base), "PPE ioremap failed\n");
> +
> +	ppe_dev->regmap = devm_regmap_init_mmio(dev, base, &regmap_config_ipq9574);
> +	if (IS_ERR(ppe_dev->regmap))
> +		return dev_err_probe(dev, PTR_ERR(ppe_dev->regmap),
> +				     "PPE initialize regmap failed\n");
> +	ppe_dev->dev = dev;
> +	ppe_dev->clk_rate = PPE_CLK_RATE;
> +	ppe_dev->num_ports = PPE_PORT_MAX;
> +	ppe_dev->num_icc_paths = num_icc;
> +
> +	ret = ppe_clock_init_and_reset(ppe_dev);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "PPE clock config failed\n");
> +
> +	platform_set_drvdata(pdev, ppe_dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id qcom_ppe_of_match[] = {
> +	{ .compatible = "qcom,ipq9574-ppe" },
> +	{},

The ending comma after a terminator like that is not needed.

> +};

...

CJ