netdev - Re: [PATCH net-next 8/9] net: hns3: add support for queue bonding mode of flow director

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Date:   Mon, 15 Mar 2021 13:04:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <huangdaode@...wei.com>, <linuxarm@...neuler.org>,
        <linuxarm@...wei.com>, Jian Shen <shenjian15@...wei.com>
Subject: Re: [PATCH net-next 8/9] net: hns3: add support for queue bonding
 mode of flow director

On Mon, 15 Mar 2021 20:23:50 +0800 Huazhong Tan wrote:
> From: Jian Shen <shenjian15@...wei.com>
> 
> For device version V3, it supports queue bonding, which can
> identify the tuple information of TCP stream, and create flow
> director rules automatically, in order to keep the tx and rx
> packets are in the same queue pair. The driver set FD_ADD
> field of TX BD for TCP SYN packet, and set FD_DEL filed for
> TCP FIN or RST packet. The hardware create or remove a fd rule
> according to the TX BD, and it also support to age-out a rule
> if not hit for a long time.
> 
> The queue bonding mode is default to be disabled, and can be
> enabled/disabled with ethtool priv-flags command.

This seems like fairly well defined behavior, IMHO we should have a full
device feature for it, rather than a private flag.

Does the device need to be able to parse the frame fully for this
mechanism to work? Will it work even if the TCP segment is encapsulated
in a custom tunnel?