Re: Regarding UDP checksum offload

Hi,

On 01/29/2015 01:56 PM, Prashant Upadhyaya wrote:

    Another thing you can do is to retry on the latest stable dpdk which
    is known to work (see csumonly.c in test-pmd).

        Let me add further, I am _just_ doing the UDP checksum offload
        and not
        the IP hdr checksum offload. I calculate and set IP header
        checksum by
        my own code. I hope that this is acceptable and does not
        interfere with
        UDP checksum offload


    This should not be a problem.

Indeed it worked with DPDK1.7 and then I retried with DPDK1.6 and it
worked there too.
Must have been some mistake at my end, may be I did not clean properly
when I was experimenting with some values of l2_len.
Sorry for the botheration to the list.

While we are at it, a quick question -- in case I have an mbuf chain
whose payloads constitute a UDP packet, should I setup the ol_flags and
the l2_len, l3_len fields only in the first mbuf header of the chain or
in all the mbuf headers of the chain ?

Only the first mbuf is required. This is the case for all offload
infos like flags, tso, ... and it's the same in rx.

Regards,
Olivier