netdev - Re: Netlink handler for ethtool --show-rxfh breaks driver compatibility

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Message-ID: <20240715132253.jd7u3ompexonweoe@skbuf>
Date: Mon, 15 Jul 2024 16:22:53 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: "Mogilappagari, Sudheer" <sudheer.mogilappagari@...el.com>,
	Michal Kubecek <mkubecek@...e.cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Wei Fang <wei.fang@....com>,
	"Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Subject: Re: Netlink handler for ethtool --show-rxfh breaks driver
 compatibility

On Mon, Jul 15, 2024 at 06:11:37AM -0700, Jakub Kicinski wrote:
> On Mon, 15 Jul 2024 14:58:07 +0300 Vladimir Oltean wrote:
> > Looking at Documentation/networking/ethtool-netlink.rst, I see
> > ETHTOOL_GRXRINGS has no netlink equivalent. So print_indir_table()
> > should still be called with the result of the ETHTOOL_GRXRINGS ioctl
> > even in the netlink case?
> 
> How about we fall back to the old method if netlink returns EOPNOTSUPP
> for CHANNELS_GET? The other API is a bit of a historic coincidence.

Explain "historic coincidence" like I'm 5?