From: Stephen Hemminger <stephen@networkplumber.org>
To: Ferruh Yigit <ferruh.yigit@amd.com>
Cc: Kaiwen Deng <kaiwenx.deng@intel.com>,
dev@dpdk.org, stable@dpdk.org, qiming.yang@intel.com,
yidingx.zhou@intel.com, Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
Olivier Matz <olivier.matz@6wind.com>,
Pablo de Lara <pablo.de.lara.guarch@intel.com>
Subject: Re: [PATCH] app/test-pmd: fix L4 checksum with padding data
Date: Thu, 16 Nov 2023 19:28:57 -0800 [thread overview]
Message-ID: <20231116192857.0d49ec5b@hermes.local> (raw)
In-Reply-To: <7a41467c-c863-4ea1-bf7c-9206bf56aa34@amd.com>
On Fri, 17 Nov 2023 00:50:16 +0000
Ferruh Yigit <ferruh.yigit@amd.com> wrote:
> >> Hi Kaiwen,
> >>
> >> I am trying to understand the problem, what is the testcase that has
> >> checksum error?
> >>
> >> Are the received mbuf data_len & pkt_len wrong? Instead of trying to fix
> >> the mbuf during forwarding, can we fix where packet generated?
> >
> > The root cause is that get_udptcp_cksum_mbuf is using m->pkt_len
> > which maybe larger than the actual data. The real issue is there and
> > in rte_ip.h checksum code. The correct fix would be to use l3_len instead.
> >
>
> I see, you are right.
>
> In 'rte_ipv4_udptcp_cksum_mbuf()',
> as payload length "mbuf->pkt_len - l4_off" is used, which includes
> padding and if padding is not zero it will end up producing wrong checksum.
>
>
> I agree using 'l3_len' instead is correct fix.
>
> But this requires ABI/API change,
> plus do we have any reason to keep the padding, discarding it as this
> patch does is also simpler alternative.
Possibly an API version to change the args would work to fix.
next prev parent reply other threads:[~2023-11-17 3:29 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-04 8:28 Kaiwen Deng
2023-11-02 19:20 ` Ferruh Yigit
2023-11-03 2:49 ` Deng, KaiwenX
2023-11-03 4:03 ` Ferruh Yigit
2023-11-14 2:19 ` Deng, KaiwenX
2023-11-14 19:09 ` Ferruh Yigit
2023-11-16 7:02 ` Deng, KaiwenX
2023-11-16 22:58 ` Stephen Hemminger
2023-11-17 0:50 ` Ferruh Yigit
2023-11-17 3:28 ` Stephen Hemminger [this message]
2023-11-17 9:29 ` Ferruh Yigit
2023-11-17 12:11 ` Morten Brørup
2023-11-17 16:23 ` Stephen Hemminger
2023-11-17 16:22 ` Stephen Hemminger
2023-11-20 10:47 ` Ferruh Yigit
2023-11-20 9:21 ` Deng, KaiwenX
2023-11-20 10:46 ` Ferruh Yigit
2023-11-22 3:04 ` Deng, KaiwenX
2023-11-17 1:13 ` Ferruh Yigit
2023-11-20 9:52 ` Deng, KaiwenX
2023-12-07 8:53 ` [PATCH v2] app/test-pmd: fix tcp/udp cksum " Kaiwen Deng
2023-12-07 14:35 ` Ferruh Yigit
2023-12-12 2:16 ` [PATCH v3] lib/net: " Kaiwen Deng
2023-12-12 8:10 ` Morten Brørup
2023-12-13 4:37 ` [PATCH v4] " Kaiwen Deng
2023-12-13 7:36 ` Morten Brørup
2023-12-14 9:22 ` [PATCH v5] " Kaiwen Deng
2023-12-14 11:20 ` Morten Brørup
2024-02-19 1:10 ` Thomas Monjalon
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