Re: [dpdk-dev] pktgen offload checksum flag not able to make it work with pacp packets.

[Banashankar KV <banveerad@gmail.com>]

Hi,
Thanks a lot for the reply !
Yes I have checked those examples and had set all those flags. But IP
checksum started working after commenting off the txq_flags from
the pktgen.c file's tx_conf .

And I added the following flag to calculate the tcp checksum.

m->ol_flags  |= PKT_TX_TCP_CKSUM

its calculating the TCP checksum but turning out to be wrong checksum.

Thanks
Banashankar



On Fri, Jan 24, 2014 at 11:44 AM, Wiles, Roger Keith <
keith.wiles@windriver.com> wrote:

>  I have not enabled that feature myself, but I would expect it to work as
> long as the hardware does. What does the docs say about enabling hardware
> offload support? Did you look at the following files:
>
>  ip_reassembly/ipv4_rsmbl.h:     m->ol_flags |= PKT_TX_IP_CKSUM;
> ipv4_frag/rte_ipv4_frag.h:              out_pkt->ol_flags |=
> PKT_TX_IP_CKSUM;
>
>  Thanks
> ++Keith
>
>    *Keith Wiles*, Principal Technologist for Networking member of the CTO
> office, *Wind River*
> mobile 940.213.5533
> [image: Powering 30 Years of Innovation]<http://www.windriver.com/announces/wr30/>
>
>  On Jan 24, 2014, at 12:54 PM, Banashankar KV <banveerad@gmail.com> wrote:
>
> I was modifying a packet in pktgen_pcap_mbuf_ctor()
> and after modifying I wanted to offload the checksum calculation to h/w
> so I am setting these flags in pktgen_pcap_mbuf_ctor function.
>
> m->pkt.vlan_macip.f.l2_len = sizeof(struct ether_hdr);
> m->pkt.vlan_macip.f.l3_len = sizeof(struct ipv4_hdr);
>
> m->ol_flags = PKT_TX_IP_CKSUM
>
>
> I even tried with setting .txq_flags = 0 in rte_eth_txconf struct in
> pktgen.c.
>
> But still not able to get the h/w checksum. Am I missing anything ?
>
>
>
> Thanks
> Banashankar
>
>
>