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From: Olivier MATZ <olivier.matz@6wind.com>
To: Alex Markuze <alex@weka.io>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] UDP Checksum
Date: Thu, 06 Nov 2014 17:15:00 +0100
Message-ID: <545B9E84.2090701@6wind.com> (raw)
In-Reply-To: <CAKfHP0WWCrftSR=z=jvUsHCLtTZdBwch0ZvadiLa9nMfcbpW-Q@mail.gmail.com>

Hello,

On 11/06/2014 05:05 PM, Alex Markuze wrote:
> I'm seeing "UDP: bad checksum." messages(dmesg) for packets sent by my dpdk
> app to a socket on a remote machine.
> Looking at the packets the scum value is set, its just not what wireshark
> expects.
> 
> When sending I'm setting these fields in the egress packets.
> 
>         pkt->pkt.vlan_macip.f.l2_len = sizeof(struct ether_hdr);
> 
>         pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
> 
>         pkt->ol_flags |= (PKT_TX_IP_CKSUM | PKT_TX_L4_MASK);
> //PKT_TX_OFFLOAD_MASK;

I think you need to do:

 pkt->pkt.vlan_macip.f.l2_len = sizeof(struct ether_hdr);
 pkt->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
 pkt->ol_flags |= (PKT_TX_IP_CKSUM | PKT_TX_UDP_CKSUM);
 ipv4_hdr->hdr_checksum = 0;
 udp_hdr->dgram_cksum = 0;
 udp_hdr->dgram_cksum = get_ipv4_psd_sum(ipv4_hdr); /* see csumonly.c */


Regards,
Olivier

  reply	other threads:[~2014-11-06 16:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-06 16:05 Alex Markuze
2014-11-06 16:15 ` Olivier MATZ [this message]
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
2019-09-24 15:11 [dpdk-dev] udp checksum Khoussi, Siham (IntlAssoc)

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