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Date: Fri, 30 Jan 2015 10:15:48 +0100
From: Olivier MATZ <olivier.matz@6wind.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] Regarding UDP checksum offload
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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