linux-kernel - Re: [PATCH net-next v2] ethtool: doc: clarify what drivers can implement in their get

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Date:   Sun, 13 Nov 2022 09:58:32 +0200
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Petr Machata <petrm@...dia.com>,
        Hao Chen <chenhao288@...ilicon.com>,
        Amit Cohen <amcohen@...dia.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sean Anderson <sean.anderson@...o.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] ethtool: doc: clarify what drivers can
 implement in their get_drvinfo()

On Fri, Nov 11, 2022 at 03:40:54PM +0900, Vincent Mailhol wrote:
> Many of the drivers which implement ethtool_ops::get_drvinfo() will
> prints the .driver, .version or .bus_info of struct ethtool_drvinfo.
> To have a glance of current state, do:
> 
>   $ git grep -W "get_drvinfo(struct"
> 
> Printing in those three fields is useless because:
> 
>   - since [1], the driver version should be the kernel version (at
>     least for upstream drivers). Arguably, out of tree drivers might
>     still want to set a custom version, but out of tree is not our
>     focus.
> 
>   - since [2], the core is able to provide default values for .driver
>     and .bus_info.
> 
> In summary, drivers may provide @fw_version and @erom_version, the
> rest is expected to be done by the core. Update the doc to reflect the
> facts.
> 
> Also update the dummy driver and simply remove the callback in order
> not to confuse the newcomers: most of the drivers will not need this
> callback function any more.
> 
> [1] commit 6a7e25c7fb48 ("net/core: Replace driver version to be
>     kernel version")
> Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a7e25c7fb482dba3e80fec953f1907bcb24d52c
> 
> [2] commit edaf5df22cb8 ("ethtool: ethtool_get_drvinfo: populate
>     drvinfo fields even if callback exits")
> Link: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=edaf5df22cb8e7e849773ce69fcc9bc20ca92160
> 
> CC: Leon Romanovsky <leonro@...lanox.com>
> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> ---
> Arguably, dummy.c is code and not documentation, but for me, it makes
> sense to treat it as documentation, thus I am putting everything in
> one single patch.

If to judge by newcomers submissions, many of them don't read documentation.

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>