From: Thomas Monjalon <thomas@monjalon.net>
To: Qian Hao <qi_an_hao@126.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, Volodymyr Fialko <vfialko@marvell.com>
Subject: Re: [EXT] [PATCH v3] examples/packet_ordering: fix segfault in disable_reorder mode
Date: Thu, 07 Mar 2024 09:22:30 +0100 [thread overview]
Message-ID: <1795568.5KxKD5qtyk@thomas> (raw)
In-Reply-To: <MW2PR18MB22823E4A3D210B5A76F9AE2EA890A@MW2PR18MB2282.namprd18.prod.outlook.com>
> > 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@126.com>
>
> Acked-by: Volodymyr Fialko <vfialko@marvell.com>
Applied, thanks.
prev parent reply other threads:[~2024-03-07 8:22 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-08 12:42 [PATCH] " Qian Hao
2023-12-11 10:51 ` [EXT] " Volodymyr Fialko
2023-12-13 10:49 ` [PATCH v2] " Qian Hao
2023-12-13 11:07 ` [PATCH v3] " Qian Hao
2023-12-18 10:59 ` [EXT] " Volodymyr Fialko
2024-03-07 8:22 ` Thomas Monjalon [this message]
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