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From: "Khoussi, Siham (IntlAssoc)" <siham.khoussi@nist.gov>
To: "dev@dpdk.org" <dev@dpdk.org>
Subject: [dpdk-dev] udp checksum
Date: Tue, 24 Sep 2019 15:11:12 +0000
Message-ID: <DM6PR09MB29542C3B7A06A900AEC276A38A840@DM6PR09MB2954.namprd09.prod.outlook.com> (raw)

Dear all,

I have a question related to layer 4 checksum. I am creating a UDP packet by appending the layers in order (udp, ipv4, Eth). However, when  I run Wireshark on the receiving end I get: [UDPchecksum = missing (nor present]. Whereas, the checksum for ipv4 works fine.
Here is what I do:

.... Filling udp header
.....
Struct udp_hdr *udp=(struct udp_hdr*)rte_pktmbuf_prepend(mbuf, sizeof(*udp));
Udp->dgram_cksum=0;
Ipv4->hdr->hdr_cksum=0;
Udp->dgram_cksum= rte_ipv4_udptcp_cksum((const struct ipv4_hdr *)ipv4_hdr, (const void *)udp);
Ipv4_hdr->hdr_cksum= rte_ipv4_cksum((const struct ipv4_hdr *)ipv4_hdr);

--- continue filling ipv4 fields
...

Does anyone have an idea why rte_ipv4_udptcp_cksum() not working?

Thank you,
Siham


             reply	other threads:[~2019-09-24 15:11 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-24 15:11 Khoussi, Siham (IntlAssoc) [this message]
  -- strict thread matches above, loose matches on Subject: below --
2014-11-06 16:05 [dpdk-dev] UDP Checksum Alex Markuze
2014-11-06 16:15 ` Olivier MATZ
2014-11-06 16:15 ` Ananyev, Konstantin
2014-11-06 16:26   ` Alex Markuze
     [not found]     ` <2601191342CEEE43887BDE71AB977258213A2EC5@IRSMSX105.ger.corp.intel.com>
2014-11-06 17:07       ` Ananyev, Konstantin

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