netdev - Re: [PATCH net-next 1/5] ethtool: add support to set/get tx spare buf size

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Date:   Wed, 25 Aug 2021 07:56:56 -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>,
        <netdev@...r.kernel.org>, <lipeng321@...wei.com>,
        <chenhao288@...ilicon.com>
Subject: Re: [PATCH net-next 1/5] ethtool: add support to set/get tx spare
 buf size

On Wed, 25 Aug 2021 14:40:51 +0800 Guangbin Huang wrote:
> From: Hao Chen <chenhao288@...ilicon.com>
> 
> Add support for ethtool to set/get tx spare buf size.
> 
> Signed-off-by: Hao Chen <chenhao288@...ilicon.com>
> Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
> ---
>  include/uapi/linux/ethtool.h | 1 +
>  net/ethtool/ioctl.c          | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index b6db6590baf0..266e95e4fb33 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -231,6 +231,7 @@ enum tunable_id {
>  	ETHTOOL_RX_COPYBREAK,
>  	ETHTOOL_TX_COPYBREAK,
>  	ETHTOOL_PFC_PREVENTION_TOUT, /* timeout in msecs */
> +	ETHTOOL_TX_COPYBREAK_BUF_SIZE,

We need good documentation for the new tunable.

>  	/*
>  	 * Add your fresh new tunable attribute above and remember to update
>  	 * tunable_strings[] in net/ethtool/common.c
> diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
> index f2abc3152888..9fc801298fde 100644
> --- a/net/ethtool/ioctl.c
> +++ b/net/ethtool/ioctl.c
> @@ -2377,6 +2377,7 @@ static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
>  	switch (tuna->id) {
>  	case ETHTOOL_RX_COPYBREAK:
>  	case ETHTOOL_TX_COPYBREAK:
> +	case ETHTOOL_TX_COPYBREAK_BUF_SIZE:
>  		if (tuna->len != sizeof(u32) ||
>  		    tuna->type_id != ETHTOOL_TUNABLE_U32)
>  			return -EINVAL;