netdev - Re: [PATCH net-next v7 2/4] ethtool: provide customized dim profile management

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Date: Tue, 16 Apr 2024 10:27:21 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org, virtualization@...ts.linux.dev,
 Jakub Kicinski <kuba@...nel.org>, "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Jason Wang <jasowang@...hat.com>, "Michael S . Tsirkin" <mst@...hat.com>,
 Brett Creeley <bcreeley@....com>, Ratheesh Kannoth <rkannoth@...vell.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH net-next v7 2/4] ethtool: provide customized dim profile
 management



在 2024/4/16 上午4:03, Simon Horman 写道:
> On Mon, Apr 15, 2024 at 05:36:36PM +0800, Heng Qi wrote:
>
> ...
>
>> @@ -10229,6 +10230,61 @@ static void netdev_do_free_pcpu_stats(struct net_device *dev)
>>   	}
>>   }
>>   
>> +static int dev_dim_profile_init(struct net_device *dev)
>> +{
>> +#if IS_ENABLED(CONFIG_DIMLIB)
>> +	u32 supported = dev->ethtool_ops->supported_coalesce_params;
>> +	struct netdev_profile_moder *moder;
>> +	int length;
>> +
>> +	dev->moderation = kzalloc(sizeof(*dev->moderation), GFP_KERNEL);
>> +	if (!dev->moderation)
>> +		goto err_moder;
>> +
>> +	moder = dev->moderation;
>> +	length = NET_DIM_PARAMS_NUM_PROFILES * sizeof(*moder->rx_eqe_profile);
>> +
>> +	if (supported & ETHTOOL_COALESCE_RX_EQE_PROFILE) {
>> +		moder->rx_eqe_profile = kzalloc(length, GFP_KERNEL);
>> +		if (!moder->rx_eqe_profile)
>> +			goto err_rx_eqe;
>> +		memcpy(moder->rx_eqe_profile, rx_profile[0], length);
>> +	}
>> +	if (supported & ETHTOOL_COALESCE_RX_CQE_PROFILE) {
>> +		moder->rx_cqe_profile = kzalloc(length, GFP_KERNEL);
>> +		if (!moder->rx_cqe_profile)
>> +			goto err_rx_cqe;
>> +		memcpy(moder->rx_cqe_profile, rx_profile[1], length);
>> +	}
>> +	if (supported & ETHTOOL_COALESCE_TX_EQE_PROFILE) {
>> +		moder->tx_eqe_profile = kzalloc(length, GFP_KERNEL);
>> +		if (!moder->tx_eqe_profile)
>> +			goto err_tx_eqe;
>> +		memcpy(moder->tx_eqe_profile, tx_profile[0], length);
>> +	}
>> +	if (supported & ETHTOOL_COALESCE_TX_CQE_PROFILE) {
>> +		moder->tx_cqe_profile = kzalloc(length, GFP_KERNEL);
>> +		if (!moder->tx_cqe_profile)
>> +			goto err_tx_cqe;
>> +		memcpy(moder->tx_cqe_profile, tx_profile[1], length);
>> +	}
> nit: Coccinelle suggests that the kzalloc()/memcpy() pattern above
>       could be replaced with calls to kmemdup()

Good idea.

Thanks.

>> +#endif
>> +	return 0;
>> +
>> +#if IS_ENABLED(CONFIG_DIMLIB)
>> +err_tx_cqe:
>> +	kfree(moder->tx_eqe_profile);
>> +err_tx_eqe:
>> +	kfree(moder->rx_cqe_profile);
>> +err_rx_cqe:
>> +	kfree(moder->rx_eqe_profile);
>> +err_rx_eqe:
>> +	kfree(moder);
>> +err_moder:
>> +	return -ENOMEM;
>> +#endif
>> +}
>> +
>>   /**
>>    * register_netdevice() - register a network device
>>    * @dev: device to register
> ...