netdev - Re: [RFC PATCH 01/10] ethtool: Add common function for filling out strings

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Date:   Wed, 10 Mar 2021 18:08:07 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        simon.horman@...ronome.com, yisen.zhuang@...wei.com,
        salil.mehta@...wei.com, intel-wired-lan@...ts.osuosl.org,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        drivers@...sando.io, snelson@...sando.io, netanel@...zon.com,
        akiyano@...zon.com, gtzalik@...zon.com, saeedb@...zon.com,
        GR-Linux-NIC-Dev@...vell.com, skalluru@...vell.com,
        rmody@...vell.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, wei.liu@...nel.org, mst@...hat.com,
        jasowang@...hat.com, pv-drivers@...are.com, doshir@...are.com,
        alexanderduyck@...com
Subject: Re: [RFC PATCH 01/10] ethtool: Add common function for filling out
 strings

On Wed, 10 Mar 2021 17:35:17 -0800 Alexander Duyck wrote:
> From: Alexander Duyck <alexanderduyck@...com>
> 
> Add a function to handle the common pattern of printing a string into the
> ethtool strings interface and incrementing the string pointer by the
> ETH_GSTRING_LEN. Most of the drivers end up doing this and several have
> implemented their own versions of this function so it would make sense to
> consolidate on one implementation.
> 
> Signed-off-by: Alexander Duyck <alexanderduyck@...com>
> ---
>  include/linux/ethtool.h |    9 +++++++++
>  net/ethtool/ioctl.c     |   12 ++++++++++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index ec4cd3921c67..0493f13b2b20 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -571,4 +571,13 @@ struct ethtool_phy_ops {
>   */
>  void ethtool_set_ethtool_phy_ops(const struct ethtool_phy_ops *ops);
>  
> +/**
> + * ethtool_gsprintf - Write formatted string to ethtool string data
> + * @data: Pointer to start of string to update
> + * @fmt: Format of string to write
> + *
> + * Write formatted string to data. Update data to point at start of
> + * next string.
> + */
> +extern __printf(2, 3) void ethtool_gsprintf(u8 **data, const char *fmt, ...);

I'd drop the 'g' TBH, it seems to have made its way from the ethtool
command ('gstrings') to various places but without the 'string' after
it - it becomes less and less meaningful. Just ethtool_sprintf() would
be fine IMHO.

Other than that there is a minor rev xmas tree violation in patch 2 :)