netdev - Fw: [Bug 89161] New: Regression in bonding driver with devices that have no MAC address

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Message-ID: <20141202093453.42e7af86@urahara>
Date:	Tue, 2 Dec 2014 09:34:53 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	netdev@...r.kernel.org
Subject: Fw: [Bug 89161] New: Regression in bonding driver with devices that
 have no MAC address



Begin forwarded message:

Date: Tue, 2 Dec 2014 02:15:05 -0800
From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
To: "stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: [Bug 89161] New: Regression in bonding driver with devices that have no MAC address


https://bugzilla.kernel.org/show_bug.cgi?id=89161

            Bug ID: 89161
           Summary: Regression in bonding driver with devices that have no
                    MAC address
           Product: Networking
           Version: 2.5
    Kernel Version: 3.17.4
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: shemminger@...ux-foundation.org
          Reporter: tjc@...trmute.net
        Regression: No

In kernel 3.13 and earlier, a user could use the "bonding" network module to
enslave devices without MAC addresses, such as ppp devices, in certain modes
(such as balance-rr).

At some point between 3.13 and 3.17, this ability was removed -- even though
apparently a commit was made to specifically ALLOW this to happen:
https://github.com/torvalds/linux/commit/f54424412b6b2f64cae4d7c39d981ca14ce0052c


On kernel 3.13, this was printed to syslog upon enslaving ppp0:
bonding: bond0: Warning: The first slave device specified does not support
setting the MAC address. Setting fail_over_mac to active.
bonding: bond0: enslaving ppp0 as an active interface with an up link.

On kernel 3.17.2 and 3.17.4 (and probably others) instead this error comes up:
bond0: Adding slave ppp0
bond0: The slave device specified does not support setting the MAC address

And the slave is not added.


In case it was relevant, I resorted to manually creating the bond0 with
appropriate options (including fail_over_mac) preset, and yet the problem
persists.

To replicate the problem, setup at least one ppp connection, and then follow
these instructions:

    modprobe bonding
    echo '+bond0' > /sys/class/net/bonding_masters
    echo 'active' > /sys/class/net/bond0/bonding/fail_over_mac
    ifconfig bond0 down
    echo 'balance-rr' > /sys/class/net/bond0/bonding/mode
    ifconfig bond0 202.xx.xx.xx netmask 255.255.255.255 mtu 1492 up
    echo '500' > /sys/class/net/bond0/bonding/miimon

    ifconfig ppp0 down
    echo '+ppp0' > /sys/class/net/bond0/bonding/slaves


Under earlier kernel versions, that would work -- but current stable kernels
fail.

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