netdev - Re: [PATCH v2 3/6] ethtool: introduce new ioctl for per-queue settings

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Date:   Wed, 6 Feb 2019 11:32:58 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>, linville@...driver.com,
        Nicholas Nunley <nicholas.d.nunley@...el.com>,
        nhorman@...hat.com, sassmann@...hat.com
Subject: Re: [PATCH v2 3/6] ethtool: introduce new ioctl for per-queue
 settings

On Tue, Feb 05, 2019 at 04:01:03PM -0800, Jeff Kirsher wrote:
> +static int find_max_num_queues(struct cmd_context *ctx)
> +{
> +	struct ethtool_channels echannels;
> +
> +	echannels.cmd = ETHTOOL_GCHANNELS;
> +	if (send_ioctl(ctx, &echannels))
> +		return -1;
> +
> +	return MAX(MAX(echannels.rx_count, echannels.tx_count),
> +		   echannels.combined_count);
> +}

Is the outer MAX() correct here? From the documentation to -L option, it
rather seems we might want

	return MAX(echannels.rx_count, echannels.tx_count) +
	       echannels.combined_count;

But I can't find any NIC around which would have non-zero rx_count or
tx_count so that I cannot check.

Michal Kubecek