Re: [dpdk-dev] [PATCH v3 0/3] enhance TX checksum command and csum forwarding engine

[Olivier MATZ <olivier.matz@6wind.com>]

Hi Konstantin,

On 01/26/2015 03:15 PM, Ananyev, Konstantin wrote:
>>>> Another thing - IPIP seems to work ok by HW.
>>>> There is something wrong on our (PMD/test-pmd) side.
>>>> I think at least we have to remove the following check:
>>>> if (!l2_len) {
>>>>                  PMD_DRV_LOG(DEBUG, "L2 length set to 0");
>>>>                  return;
>>>>          }
>>>> in i40e_txd_enable_checksum().
>>>
>>> Yes, for IPIP, the check should be removed.
>>
>> Yes, I think these lines should be removed for 2 reasons:
>> - it may be the cause of ipip tunnel not working
>> - we shouldn't do these kind of tests in dataplane. I think we have to
>>    suppose that the data passed to the PMD is valid.
>>
>> I'll redo the test with ipip tomorrow with this fix and let you
>> know the result. If it works, I'll add this in the next version
>> of the patch.
>
> While you are on this, can I suggest you'll add debug logging for TCD and TDD we are writing to the TX ring?
> Something like that:
>
> +                       PMD_TX_LOG(DEBUG, "mbuf: %p, TCD[%u]:\n"
> +                               "tunneling_params: %#x;\n"
> +                               "l2tag2: %#hx;\n"
> +                               "rsvd: %#hx;\n"
> +                               "type_cmd_tso_mss: %#lx;\n",
> +                               tx_pkt, tx_id,
> +                               ctx_txd->tunneling_params,
> +                               ctx_txd->l2tag2,
> +                               ctx_txd->rsvd,
> +                               ctx_txd->type_cmd_tso_mss);
>
> And same for TDD.
> It  helped me a lot to figure out what is going on, when I did my tests.
> Probably would be useful for other people too.

Sure, I'll add this.

Also, just to let you know that I tested the ipip case without the
"if (l2_len) return" and "if (l3_len) return", and it is working.

Regards,
Olivier