[dpdk-dev] about rx checksum flags

[Chandran, Sugesh]

Hi Olivier,

Just to confirm , is this rx checksum patch already submitted in the DPDK ML?
We would like to use these flags to speed up the tunneling in OVS.



Regards
_Sugesh


> -----Original Message-----
> From: Chandran, Sugesh
> Sent: Friday, June 10, 2016 5:16 PM
> To: 'Olivier Matz' <olivier.matz at 6wind.com>; Ananyev, Konstantin
> <konstantin.ananyev at intel.com>; Stephen Hemminger
> <stephen at networkplumber.org>
> Cc: Yuanhan Liu <yuanhan.liu at linux.intel.com>; dev at dpdk.org; Richardson,
> Bruce <bruce.richardson at intel.com>; Adrien Mazarguil
> <adrien.mazarguil at 6wind.com>; Tan, Jianfeng <jianfeng.tan at intel.com>
> Subject: RE: [dpdk-dev] about rx checksum flags
> 
> 
> 
> Regards
> _Sugesh
> 
> > -----Original Message-----
> > From: Olivier Matz [mailto:olivier.matz at 6wind.com]
> > Sent: Wednesday, June 8, 2016 2:02 PM
> > To: Chandran, Sugesh <sugesh.chandran at intel.com>; Ananyev, Konstantin
> > <konstantin.ananyev at intel.com>; Stephen Hemminger
> > <stephen at networkplumber.org>
> > Cc: Yuanhan Liu <yuanhan.liu at linux.intel.com>; dev at dpdk.org;
> > Richardson, Bruce <bruce.richardson at intel.com>; Adrien Mazarguil
> > <adrien.mazarguil at 6wind.com>; Tan, Jianfeng <jianfeng.tan at intel.com>
> > Subject: Re: [dpdk-dev] about rx checksum flags
> >
> > Hi,
> >
> > On 06/08/2016 10:22 AM, Chandran, Sugesh wrote:
> > >>> I guess the IP checksum also important as L4. In some cases, UDP
> > >>> checksum is zero and no need to validate it. But Ip checksum is
> > >>> present on all the packets and that must be validated all  the time.
> > >>> At higher packet rate, the ip checksum offload can offer slight
> > >>> performance
> > >> improvement. What do you think??
> > >>>
> > >>
> > >> Agree, in some situations (and this is even more true with packet
> > >> types / smartnics), the application could process without accessing
> > >> the packet data if we keep the IP cksum flags.
> > > [Sugesh] True, If that's the case, Will you considering to implement
> > > IP checksum flags as well along with L4?
> > > As you said , this will be useful when we offload packet lookup
> > > itself into the NICs(May be when using Flow director) ?
> >
> > Yes, I plan to implement the same rx status flags (good, bad, unknown,
> > none) for rx IP checksum too.
> [Sugesh] That's great!, Thank you Olivier.
> >
> > Regards,
> > Olivier