netdev - Re: [RFC net-next v02 1/3] net: hinic3: module initialization and tx/rx logic

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Message-ID: <b794027a-ef3b-4262-a952-db249a840e89@lunn.ch>
Date: Thu, 12 Dec 2024 18:41:44 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Gur Stavi <gur.stavi@...wei.com>
Cc: gongfan <gongfan1@...wei.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>, linux-doc@...r.kernel.org,
	Jonathan Corbet <corbet@....net>,
	Cai Huoqing <cai.huoqing@...ux.dev>, Xin Guo <guoxin09@...wei.com>,
	Shen Chenyang <shenchenyang1@...ilicon.com>,
	Zhou Shuai <zhoushuai28@...wei.com>, Wu Like <wulike1@...wei.com>,
	Shi Jing <shijing34@...wei.com>,
	Meny Yossefi <meny.yossefi@...wei.com>
Subject: Re: [RFC net-next v02 1/3] net: hinic3: module initialization and
 tx/rx logic

> +static void hinic3_del_one_adev(struct hinic3_hwdev *hwdev,
> +				enum hinic3_service_type svc_type)
> +{
> +	struct hinic3_pcidev *pci_adapter = hwdev->adapter;
> +	struct hinic3_adev *hadev;
> +	bool timeout = true;
> +	unsigned long end;
> +
> +	end = jiffies + msecs_to_jiffies(HINIC3_EVENT_PROCESS_TIMEOUT);
> +	do {
> +		if (!test_and_set_bit(svc_type, &pci_adapter->state)) {
> +			timeout = false;
> +			break;
> +		}
> +		usleep_range(900, 1000);
> +	} while (time_before(jiffies, end));
> +
> +	if (timeout && !test_and_set_bit(svc_type, &pci_adapter->state))
> +		timeout = false;

Please look at using iopoll.h

> +static int hinic3_sw_init(struct net_device *netdev)
> +{
> +	struct hinic3_nic_dev *nic_dev = netdev_priv(netdev);
> +	struct hinic3_hwdev *hwdev = nic_dev->hwdev;
> +	int err;
> +
> +	nic_dev->q_params.sq_depth = HINIC3_SQ_DEPTH;
> +	nic_dev->q_params.rq_depth = HINIC3_RQ_DEPTH;
> +
> +	hinic3_try_to_enable_rss(netdev);
> +
> +	eth_hw_addr_random(netdev);

Is using a random MAC just a temporary thing until more code is added
to access an OTP?

> +	err = register_netdev(netdev);
> +	if (err) {
> +		err = -ENOMEM;
> +		goto err_netdev;
> +	}
> +
> +	netif_carrier_off(netdev);
> +
> +	dev_set_drvdata(&adev->dev, nic_dev);

Is this used anywhere in the driver? Calling register_netdev() makes
the interface live, even before it returns. If you have NFS root for
example, it could be sending packets, etc, before drvdata is set.

> +int hinic3_set_port_mtu(struct net_device *netdev, u16 new_mtu)
> +{
> +	struct hinic3_nic_dev *nic_dev = netdev_priv(netdev);
> +	struct hinic3_func_tbl_cfg func_tbl_cfg = {};
> +	struct hinic3_hwdev *hwdev = nic_dev->hwdev;
> +
> +	if (new_mtu < HINIC3_MIN_MTU_SIZE) {
> +		dev_err(hwdev->dev,
> +			"Invalid mtu size: %ubytes, mtu size < %ubytes\n",
> +			new_mtu, HINIC3_MIN_MTU_SIZE);
> +		return -EINVAL;
> +	}
> +
> +	if (new_mtu > HINIC3_MAX_JUMBO_FRAME_SIZE) {
> +		dev_err(hwdev->dev, "Invalid mtu size: %ubytes, mtu size > %ubytes\n",
> +			new_mtu, HINIC3_MAX_JUMBO_FRAME_SIZE);
> +		return -EINVAL;
> +	}

The core can do this validation for you, if you set ndev->max_mtu,
ndev->min_mtu.


    Andrew

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