netdev - Re: [RFC V2 net-next 1/3] ethtool: extend coalesce setting uAPI with CQE mode

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Date:   Sat, 29 May 2021 14:23:55 -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@...wei.com>,
        <dledford@...hat.com>, <jgg@...pe.ca>, <netanel@...zon.com>,
        <akiyano@...zon.com>, <thomas.lendacky@....com>,
        <irusskikh@...vell.com>, <michael.chan@...adcom.com>,
        <edwin.peer@...adcom.com>, <rohitm@...lsio.com>,
        <jesse.brandeburg@...el.com>, <jacob.e.keller@...el.com>,
        <ioana.ciornei@....com>, <vladimir.oltean@....com>,
        <sgoutham@...vell.com>, <sbhatta@...vell.com>, <saeedm@...dia.com>,
        <ecree.xilinx@...il.com>, <grygorii.strashko@...com>,
        <merez@...eaurora.org>, <kvalo@...eaurora.org>,
        <linux-wireless@...r.kernel.org>
Subject: Re: [RFC V2 net-next 1/3] ethtool: extend coalesce setting uAPI
 with CQE mode

On Sat, 29 May 2021 11:22:14 +0800 Huazhong Tan wrote:
> diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst
> index 25131df..8e8c6b3 100644
> --- a/Documentation/networking/ethtool-netlink.rst
> +++ b/Documentation/networking/ethtool-netlink.rst
> @@ -937,6 +937,8 @@ Kernel response contents:
>    ``ETHTOOL_A_COALESCE_TX_USECS_HIGH``         u32     delay (us), high Tx
>    ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH``    u32     max packets, high Tx
>    ``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL``  u32     rate sampling interval
> +  ``ETHTOOL_A_COALESCE_USE_CQE_TX``	       bool    timer reset in CQE, Tx
> +  ``ETHTOOL_A_COALESCE_USE_CQE_RX``	       bool    timer reset in CQE, Rx
>    ===========================================  ======  =======================
>  
>  Attributes are only included in reply if their value is not zero or the
> @@ -975,6 +977,8 @@ Request contents:
>    ``ETHTOOL_A_COALESCE_TX_USECS_HIGH``         u32     delay (us), high Tx
>    ``ETHTOOL_A_COALESCE_TX_MAX_FRAMES_HIGH``    u32     max packets, high Tx
>    ``ETHTOOL_A_COALESCE_RATE_SAMPLE_INTERVAL``  u32     rate sampling interval
> +  ``ETHTOOL_A_COALESCE_USE_CQE_TX``	       bool    timer reset in CQE, Tx
> +  ``ETHTOOL_A_COALESCE_USE_CQE_RX``	       bool    timer reset in CQE, Rx
>    ===========================================  ======  =======================
>  
>  Request is rejected if it attributes declared as unsupported by driver (i.e.

Did you provide the theory of operation for CQE vs EQE mode somewhere,
as I requested?

> +	[ETHTOOL_A_COALESCE_USE_CQE_MODE_TX]	= { .type = NLA_U8 },
> +	[ETHTOOL_A_COALESCE_USE_CQE_MODE_RX]	= { .type = NLA_U8 },

Why not NLA_POLICY_MAX(NLA_U8, 1) ?

Any chance you could split the patch into adding the new parameter 
to the callback and adding new attributes?