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net: bridge: disable bridge MTU auto tuning if it was set manually
As Roopa noted today the biggest source of problems when configuring bridge and ports is that the bridge MTU keeps changing automatically on port events (add/del/changemtu). That leads to inconsistent behaviour and network config software needs to chase the MTU and fix it on each such event. Let's improve on that situation and allow for the user to set any MTU within ETH_MIN/MAX limits, but once manually configured it is the user's responsibility to keep it correct afterwards. In case the MTU isn't manually set - the behaviour reverts to the previous and the bridge follows the minimum MTU. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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