netdev - Re: [PATCH v4 net-next 2/7] net: ethtool: attach an XArray of custom RSS contexts to a netdevice

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Date: Wed, 4 Oct 2023 16:00:07 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: <edward.cree@....com>
Cc: <linux-net-drivers@....com>, <davem@...emloft.net>,
 <edumazet@...gle.com>, <pabeni@...hat.com>, Edward Cree
 <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>,
 <habetsm.xilinx@...il.com>, <sudheer.mogilappagari@...el.com>,
 <jdamato@...tly.com>, <andrew@...n.ch>, <mw@...ihalf.com>,
 <linux@...linux.org.uk>, <sgoutham@...vell.com>, <gakula@...vell.com>,
 <sbhatta@...vell.com>, <hkelam@...vell.com>, <saeedm@...dia.com>,
 <leon@...nel.org>
Subject: Re: [PATCH v4 net-next 2/7] net: ethtool: attach an XArray of
 custom RSS contexts to a netdevice

On Wed, 27 Sep 2023 19:13:33 +0100 edward.cree@....com wrote:
> +	struct ethtool_rxfh_context *ctx;
> +	unsigned long context;
> +
> +	if (dev->ethtool_ops->set_rxfh_context)

Can there be contexts if there's no callback to create them?
Perhaps you need this for later patches but would be good to
mention "why" in the commit message.

> +		xa_for_each(&dev->ethtool->rss_ctx, context, ctx) {
> +			u32 *indir = ethtool_rxfh_context_indir(ctx);
> +			u8 *key = ethtool_rxfh_context_key(ctx);
> +			u32 concast = context;
> +
> +			xa_erase(&dev->ethtool->rss_ctx, context);
> +			dev->ethtool_ops->set_rxfh_context(dev, indir, key,
> +							   ctx->hfunc, &concast,
> +							   true);
> +			kfree(ctx);
> +		}