[dpdk-dev] How to calculate checksum automically with NIC when sending a packet?

[Vladimir Medvedkin]

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 at 126.com>

> RT~
>