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Date:	Sun, 09 Mar 2014 12:37:12 -0700
From:	Eric Dumazet <>
To:	Ming Chen <>
Cc:	John Fastabend <>,, Erez Zadok <>,
	Dean Hildebrand <>,
	Geoff Kuenning <>
Subject: Re: [BUG?] ixgbe: only num_online_cpus() of the tx queues are

On Sun, 2014-03-09 at 15:22 -0400, Ming Chen wrote:
> Hi Eric and John,
> I could not get the command working:
> #ethtool -l p3p1
> Channel parameters for p3p1:
> Pre-set maximums:
> RX:             0
> TX:             0
> Other:          1
> Combined:       63
> Current hardware settings:
> RX:             0
> TX:             0
> Other:          1
> Combined:       6
> #ethtool -L p3p1 rx 1 tx 1
> Cannot set device channel parameters: Invalid argument
> #ethtool -L p3p1 rx 1 tx 1 other 1
> other unmodified, ignoring
> Cannot set device channel parameters: Invalid argument

You need more recent kernel for ixgbe support :

commit 4c696ca9fbabc5f94a3c6db7f009e73f0ef21831
Author: Alexander Duyck <>
Date:   Thu Jan 17 08:39:33 2013 +0000

    ixgbe: Add support for set_channels ethtool operation
    This change adds support for the ethtool set_channels operation.
    Since the ixgbe driver has to support DCB as well as the other modes the
    assumption I made here is that the number of channels in DCB modes refers
    to the number of queues per traffic class, not the number of queues total.
    CC: Ben Hutchings <>
    Signed-off-by: Alexander Duyck <>
    Tested-by: Phil Schmitt <>
    Signed-off-by: Jeff Kirsher <>

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