netdev - Re: [PATCH 3/4] ethtool: can't set combined and tx/rx channel counts at the same time

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 8 Feb 2016 20:52:47 +0000
From:	Jakub Kicinski <moorray3@...pl>
To:	Jacob Keller <jacob.e.keller@...el.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 3/4] ethtool: can't set combined and tx/rx channel
 counts at the same time

On Mon,  8 Feb 2016 12:06:04 -0800, Jacob Keller wrote:
> +	/* can't set combined and separate channels at the same time */
> +	if ((channels.combined_count &&
> +	     (channels.rx_count || channels.tx_count))
> +	    return -EINVAL;
> +
>  	/* ensure the new Rx count fits within the configured Rx flow
>  	 * indirection table settings */
>  	if (netif_is_rxfh_configured(dev) &&

My understanding is that unsymmetrical rx/tx queue configuration with
combined IRQ vectors should be expressed as:

combined = min(tx, rx);
num_tx = tx - combined;
num_rx = rx - combined;

Please see:

https://www.mail-archive.com/netdev@vger.kernel.org/msg93977.html

Patches which I cooked up for this are rotting in my queue blocked by
other things, unfortunately.