netdev - Re: [PATCH net-next 0/2] net: ethtool add VxLAN to the NFC API

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Date:   Mon, 22 Aug 2022 22:46:14 +0800
From:   "huangguangbin (A)" <huangguangbin2@...wei.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <idosch@...dia.com>,
        <linux@...pel-privat.de>, <mkubecek@...e.cz>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lipeng321@...wei.com>, <shenjian15@...wei.com>
Subject: Re: [PATCH net-next 0/2] net: ethtool add VxLAN to the NFC API



On 2022/8/18 2:16, Jakub Kicinski wrote:
> On Wed, 17 Aug 2022 22:35:36 +0800 Guangbin Huang wrote:
>> This series adds support for steering VxLAN flows using the ethtool NFC
>> interface, and implements it for hns3 devices.
> 
> Why can't TC be used for this? Let's not duplicate the same
> functionality in two places, TC flower can already match on
> tunnel headers.
> .
> 
Hi Jakub,
1. I check the manual and implement of TC flower, it doesn't seems
    to support configuring flows steering to a specific queue.
2. Our hns3 driver has supported configuring some type of flows
    steering to a specific queue by ethtool -U command, many users
    have already use ethtool way.
3. In addition, if our driver supports TC flower to configure flows
    steering to a specific queue, can we allow user to simultaneously
    use TC flower and ethtool to configure flow rules? Could the rules
    configured by TC flower be queried by ethtool -u?
    If two ways can be existing, I think it is more complicated for
    driver to manage flow rules.