netdev - Re: net: bridge: propagate error code and extack from br_mc_disabled

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Message-Id: <20210421181808.5210-1-borntraeger@de.ibm.com>
Date:   Wed, 21 Apr 2021 20:18:08 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     olteanv@...il.com
Cc:     andrew@...n.ch, davem@...emloft.net, f.fainelli@...il.com,
        idosch@...sch.org, jiri@...nulli.us, kuba@...nel.org,
        netdev@...r.kernel.org, nikolay@...dia.com, roopa@...dia.com,
        vladimir.oltean@....com, linux-next@...r.kernel.org,
        borntraeger@...ibm.com
Subject: Re: net: bridge: propagate error code and extack from br_mc_disabled_update

Whatever version landed in next, according to bisect this broke libvirt/kvms use of bridges:


# virsh start s31128001
error: Failed to start domain 's31128001'
error: Unable to add bridge virbr1 port vnet0: Operation not supported

# grep vnet0 /var/log/libvirt/libvirtd.log

2021-04-21 07:43:09.453+0000: 2460: info : virNetDevTapCreate:240 : created device: 'vnet0'
2021-04-21 07:43:09.453+0000: 2460: debug : virNetDevSetMACInternal:287 : SIOCSIFHWADDR vnet0 MAC=fe:bb:83:28:01:02 - Success
2021-04-21 07:43:09.453+0000: 2460: error : virNetDevBridgeAddPort:633 : Unable to add bridge virbr1 port vnet0: Operation not supported
2021-04-21 07:43:09.466+0000: 2543: debug : udevHandleOneDevice:1695 : udev action: 'add': /sys/devices/virtual/net/vnet0

Christian