* [dpdk-dev] How to calculate checksum automically with NIC when sending a packet?
@ 2013-11-22 2:40 William Rolinson
2013-11-22 12:07 ` Vladimir Medvedkin
0 siblings, 1 reply; 3+ messages in thread
From: William Rolinson @ 2013-11-22 2:40 UTC (permalink / raw)
To: dev
RT~
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] How to calculate checksum automically with NIC when sending a packet?
2013-11-22 2:40 [dpdk-dev] How to calculate checksum automically with NIC when sending a packet? William Rolinson
@ 2013-11-22 12:07 ` Vladimir Medvedkin
2013-11-22 12:14 ` Vladimir Medvedkin
0 siblings, 1 reply; 3+ messages in thread
From: Vladimir Medvedkin @ 2013-11-22 12:07 UTC (permalink / raw)
To: William Rolinson; +Cc: dev
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~
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] How to calculate checksum automically with NIC when sending a packet?
2013-11-22 12:07 ` Vladimir Medvedkin
@ 2013-11-22 12:14 ` Vladimir Medvedkin
0 siblings, 0 replies; 3+ messages in thread
From: Vladimir Medvedkin @ 2013-11-22 12:14 UTC (permalink / raw)
To: William Rolinson; +Cc: dev
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~
>>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-11-22 12:13 UTC | newest]
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2013-11-22 2:40 [dpdk-dev] How to calculate checksum automically with NIC when sending a packet? William Rolinson
2013-11-22 12:07 ` Vladimir Medvedkin
2013-11-22 12:14 ` Vladimir Medvedkin
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