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Message-ID: <2134f66e-057b-ac49-25eb-4f0904fa8240@huawei.com>
Date: Mon, 11 Apr 2022 16:01:12 +0800
From: "wangjie (L)" <wangjie125@...wei.com>
To: Jakub Kicinski <kuba@...nel.org>,
Guangbin Huang <huangguangbin2@...wei.com>
CC: <davem@...emloft.net>, <pabeni@...hat.com>, <mkubecek@...e.cz>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<lipeng321@...wei.com>, <chenhao288@...ilicon.com>
Subject: Re: [PATCH net-next 2/3] net: ethtool: move checks before rtnl_lock()
in ethnl_set_rings
On 2022/4/9 5:58, Jakub Kicinski wrote:
> On Fri, 8 Apr 2022 15:12:44 +0800 Guangbin Huang wrote:
>> + if (tb[ETHTOOL_A_RINGS_RX_BUF_LEN] &&
>> + nla_get_u32(tb[ETHTOOL_A_RINGS_RX_BUF_LEN]) != 0 &&
>
> I think we can drop the value checking. If attribute is present and
> drivers doesn't support - reject. I don't think that would require
> any changes to existing user space but please double check.
>
I have checked user space code and tested the delete version on my
server, these value checking will be dropped in v2.
>> + !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
>> + ret = -EOPNOTSUPP;
>> + NL_SET_ERR_MSG_ATTR(info->extack,
>> + tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
>> + "setting rx buf len not supported");
>> + goto out_dev;
>> + }
>> +
>> + if (tb[ETHTOOL_A_RINGS_CQE_SIZE] &&
>> + nla_get_u32(tb[ETHTOOL_A_RINGS_CQE_SIZE]) &&
>> + !(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
>> + ret = -EOPNOTSUPP;
>> + NL_SET_ERR_MSG_ATTR(info->extack,
>> + tb[ETHTOOL_A_RINGS_CQE_SIZE],
>> + "setting cqe size not supported");
>> + goto out_dev;
>> + }
>
> .
>
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