** Also affects: linux-lts-utopic (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-lts-utopic (Ubuntu Trusty)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1547680
Title:
bonded interfaces in bridge do not have LRO turned off
Status in linux package in Ubuntu:
Fix Released
Status in linux-lts-utopic package in Ubuntu:
New
Status in linux source package in Trusty:
Fix Committed
Status in linux-lts-utopic source package in Trusty:
Fix Committed
Bug description:
The "large receive offload" functionality of some NICs is not
compatible with packet forwarding, because it modifies incoming
packets in an irreversible way so the packets can't be correctly
forwarded across the bridge. When an interface is added to a bridge,
the kernel automatically disables LRO via dev_disable_lro(), however
in trusty this only works for normal interfaces (or vlan/macvlan)
added to a bridge. When interfaces belong to a bond, and the bond is
added to a bridge, the interfaces' LRO is not disabled, and (some)
incoming packets are modified by LRO and then lost when passing
through the bridge.
Commit fbe168ba91f7c327856f205699404284c2f09e36 updates
dev_disable_lro() to work for all types of interfaces, including
bonds.
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