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Date: Fri, 22 Nov 2013 16:14:12 +0400
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From: Vladimir Medvedkin <medvedkinv@gmail.com>
To: William Rolinson <mydpdk@126.com>
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Subject: Re: [dpdk-dev] How to calculate checksum automically with NIC when
 sending a packet?
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Of course you have to properly set
m->pkt.vlan_macip.f.l2_len and
m->pkt.vlan_macip.f.l3_len fields.

Regards,
Vladimir


2013/11/22 Vladimir Medvedkin <medvedkinv@gmail.com>

> Hi,
>
> If you need only ip checksum:
> struct rte_mbuf *m;
> m->ol_flags |= PKT_TX_IP_CKSUM;
>
> if you need to calculate tcp checksum add also PKT_TX_TCP_CKSUM flag to
> ol_flags field and caclulate pseudoheader checksum (see get_ipv4_psd_sum()
> in app/test-pmd/csumonly.c)
>
> struct tcp_hdr *th;
> th->cksum               = get_ipv4_psd_sum(iph);
>
> Regards,
> Vladimir
>
>
>
>
> 2013/11/22 William Rolinson <mydpdk@126.com>
>
>> RT~
>>
>
>