netdev - Re: [PATCH V3 net-next 3/6] ethtool: add support to set/get rx buf len via ethtool

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Date:   Tue, 12 Oct 2021 11:26:24 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Guangbin Huang <huangguangbin2@...wei.com>
Cc:     <davem@...emloft.net>, <mkubecek@...e.cz>, <andrew@...n.ch>,
        <amitc@...lanox.com>, <idosch@...sch.org>, <danieller@...dia.com>,
        <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <jdike@...toit.com>, <richard@....at>,
        <anton.ivanov@...bridgegreys.com>, <netanel@...zon.com>,
        <akiyano@...zon.com>, <gtzalik@...zon.com>, <saeedb@...zon.com>,
        <chris.snook@...il.com>, <ulli.kroll@...glemail.com>,
        <linus.walleij@...aro.org>, <jeroendb@...gle.com>,
        <csully@...gle.com>, <awogbemila@...gle.com>, <jdmason@...zu.us>,
        <rain.1986.08.12@...il.com>, <zyjzyj2000@...il.com>,
        <kys@...rosoft.com>, <haiyangz@...rosoft.com>, <mst@...hat.com>,
        <jasowang@...hat.com>, <doshir@...are.com>,
        <pv-drivers@...are.com>, <jwi@...ux.ibm.com>,
        <kgraul@...ux.ibm.com>, <hca@...ux.ibm.com>, <gor@...ux.ibm.com>,
        <johannes@...solutions.net>, <netdev@...r.kernel.org>,
        <lipeng321@...wei.com>, <chenhao288@...ilicon.com>,
        <linux-s390@...r.kernel.org>
Subject: Re: [PATCH V3 net-next 3/6] ethtool: add support to set/get rx buf
 len via ethtool

On Tue, 12 Oct 2021 21:41:24 +0800 Guangbin Huang wrote:
> From: Hao Chen <chenhao288@...ilicon.com>
> 
> Add support to set rx buf len via ethtool -G parameter and get
> rx buf len via ethtool -g parameter.
> 
> Signed-off-by: Hao Chen <chenhao288@...ilicon.com>
> Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>

> +  ``ETHTOOL_A_RINGS_RX_BUF_LEN``        u32     size of buffers on the ring
>    ====================================  ======  ==========================

Does the documentation build without warnings?

> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index 266e95e4fb33..83544186cbb5 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -535,6 +535,14 @@ struct ethtool_ringparam {
>  	__u32	tx_pending;
>  };
>  
> +/**
> + * struct ethtool_ringparam_ext - RX/TX ring configuration
> + * @rx_buf_len: Current length of buffers on the rx ring.
> + */
> +struct ethtool_ringparam_ext {
> +	__u32	rx_buf_len;
> +};

This can be moved to include/linux/ethtool.h, user space does not need
to know about this structure.

> +	if (ringparam_ext.rx_buf_len != 0 &&
> +	    !(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 not supported rx buf len");

"setting rx buf len not supported" sounds better

> +		goto out_ops;
> +	}
> +
>  	ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
>  	if (ret < 0)
>  		goto out_ops;