[EXT] [PATCH v3] examples/packet_ordering: fix segfault in disable_reorder mode

[Thomas Monjalon]

> > The packet_ordering example works in two modes (opt via --disable-reorder):
> >   - When reorder is enabled: rx_thread - N*worker_thread - send_thread
> >   - When reorder is disabled: rx_thread - N*worker_thread - tx_thread N parallel worker_thread(s)
> > generate out-of-order packets.
> > 
> > When reorder is enabled, send_thread uses sequence number generated in rx_thread (L459) to
> > enforce packet ordering. Otherwise rx_thread just sends any packet it receives.
> > 
> > rx_thread writes sequence number into a dynamic field, which is only registered by calling
> > rte_reorder_create() (Line 741) when reorder is enabled. However, rx_thread marks sequence
> > number onto each packet no matter whether reorder is enabled, overwriting the leading bytes in
> > packet mbufs when reorder is disabled, resulting in segfaults when PMD tries to DMA packets.
> > 
> > `if (!disable_reorder_flag) {...}` is added in rx_thread to fix the bug.
> > The test is inlined by the compiler to prevent any performance loss.
> > 
> > Signed-off-by: Qian Hao <qi_an_hao at 126.com>
> 
> Acked-by: Volodymyr Fialko <vfialko at marvell.com> 

Applied, thanks.