linux-kernel - Re: [RFC V2 net-next 1/2] ethtool: add support for controling the type of adaptive coalescing

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Message-ID: <51257502-cf5e-0a98-5bbd-5e3d18d3e15a@huawei.com>
Date:   Sat, 21 Nov 2020 10:00:36 +0800
From:   tanhuazhong <tanhuazhong@...wei.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <kuba@...nel.org>, <mkubecek@...e.cz>
Subject: Re: [RFC V2 net-next 1/2] ethtool: add support for controling the
 type of adaptive coalescing



On 2020/11/20 23:25, Andrew Lunn wrote:
>> @@ -310,6 +334,13 @@ int ethnl_set_coalesce(struct sk_buff *skb, struct genl_info *info)
>>   	ret = dev->ethtool_ops->set_coalesce(dev, &coalesce);
>>   	if (ret < 0)
>>   		goto out_ops;
>> +
>> +	if (ops->set_ext_coalesce) {
>> +		ret = ops->set_ext_coalesce(dev, &ext_coalesce);
>> +		if (ret < 0)
>> +			goto out_ops;
>> +	}
>> +
> 
> The problem here is, if ops->set_ext_coalesce() fails, you need to
> undo what dev->ethtool_ops->set_coalesce() did. From the users
> perspective, this should be atomic. It does everything, or it does
> nothing and returns an error code.
> 
> And that is not easy given this structure of two op calls.
> 
>      Andrew
> 

yes, i will try what Michal suggested in V1.

Regards.
Huazhong.

> .
>