[Bridge] [Bugme-new] [Bug 37202] New: Cannot change MTU on bridged interface

Shan Wei shanwei at cn.fujitsu.com
Mon Jun 13 20:16:06 PDT 2011

Andrew Morton wrote, at 06/14/2011 07:37 AM:
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> On Sat, 11 Jun 2011 10:59:18 GMT
> bugzilla-daemon at bugzilla.kernel.org wrote:
>> https://bugzilla.kernel.org/show_bug.cgi?id=37202
>>            Summary: Cannot change MTU on bridged interface
>>            Product: Networking
>>            Version: 2.5
>>     Kernel Version: 3.0.0-rc2
>>           Platform: All
>>         OS/Version: Linux
>>               Tree: Mainline
>>             Status: NEW
>>           Severity: normal
>>           Priority: P1
>>          Component: Other
>>         AssignedTo: acme at ghostprotocols.net
>>         ReportedBy: steve-alexander at roadrunner.com
>>         Regression: No
>> Without bridge, setting mtu on eth0 works as expected.
>> When eth0 is added to bridge 'br0' and this command is executed,
>> ip link set eth0 mtu 4000

This bug has been fixed.

commit 6407d74c5106bb362b4087693688afd34942b094
Author: Alexander Holler <holler at ahsoftware.de>
Date:   Tue Jun 7 00:51:35 2011 -0700

    bridge: provide a cow_metrics method for fake_ops
    Like in commit 0972ddb237 (provide cow_metrics() methods to blackhole
    dst_ops), we must provide a cow_metrics for bridges fake_dst_ops as
    This fixes a regression coming from commits 62fa8a846d7d (net: Implement
    read-only protection and COW'ing of metrics.) and 33eb9873a28 (bridge:
    initialize fake_rtable metrics)
    ip link set mybridge mtu 1234

Best Regards
Shan Wei

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