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Date: Fri, 22 Nov 2013 16:07:42 +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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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~
>