From: Paolo Abeni <pab...@redhat.com>
Date: Wed, 21 Nov 2018 18:21:35 +0100
> Eric noted that with UDP GRO and NAPI timeout, we could keep a single
> UDP packet inside the GRO hash forever, if the related NAPI instance
> calls napi_gro_complete() at an higher frequency than the NAPI timeout.
> Willem noted that even TCP packets could be trapped there, till the
> next retransmission.
> This patch tries to address the issue, flushing the old packets -
> those with a NAPI_GRO_CB age before the current jiffy - before scheduling
> the NAPI timeout. The rationale is that such a timeout should be
> well below a jiffy and we are not flushing packets eligible for sane GRO.
>
> v1 -> v2:
> - clarified the commit message and comment
>
> RFC -> v1:
> - added 'Fixes tags', cleaned-up the wording.
>
> Reported-by: Eric Dumazet <eric.duma...@gmail.com>
> Fixes: 3b47d30396ba ("net: gro: add a per device gro flush timer")
> Signed-off-by: Paolo Abeni <pab...@redhat.com>
Applied and queued up for -stable.
