From: Tobias Waldekranz <tob...@waldekranz.com> Date: Thu, 25 Jun 2020 10:57:28 +0200
> In the ISR, we poll the event register for the queues in need of > service and then enter polled mode. After this point, the event > register will never be read again until we exit polled mode. > > In a scenario where a UDP flow is routed back out through the same > interface, i.e. "router-on-a-stick" we'll typically only see an rx > queue event initially. Once we start to process the incoming flow > we'll be locked polled mode, but we'll never clean the tx rings since > that event is never caught. > > Eventually the netdev watchdog will trip, causing all buffers to be > dropped and then the process starts over again. > > By adding a poll of the active events at each NAPI call, we avoid the > starvation. > > Signed-off-by: Tobias Waldekranz <tob...@waldekranz.com> You're losing events, which is a bug. Therefore this is a bug fix which should be submitted to 'net' and an appropriate "Fixes: " tag must be added to your commit message. Thank you.
