Thank you much Neale. Your inputs really helped.
On Tue, May 25, 2021, 23:57 Neale Ranns <ne...@graphiant.com> wrote: > > > Hi Vijay, > > > > It is called from ipX-midchain. > > > > /neale > > > > *From: *Vijay Kumar <vjkumar2...@gmail.com> > *Date: *Tuesday, 25 May 2021 at 17:08 > *To: *Neale Ranns <ne...@graphiant.com> > *Cc: *vpp-dev <vpp-dev@lists.fd.io> > *Subject: *Re: [vpp-dev] Regarding vnet/gre > > Hi Neale, > > > > Thanks for the useful input. I will implement a new fixup function similar > to the one mentioned. > > I believe the gre44_fixup function callback is registered via > *adj_nbr_midchain_update_rewrite()* > > > > I saw the code of *adj-midchain-tx* graph node but could not find the > fixup function being called. Could you confirm which is the exact graph > node that calls this fixup callback to process GRE headers? > > > > > > Regards, > > Vijay > > > > On Tue, May 25, 2021 at 6:32 PM Neale Ranns <ne...@graphiant.com> wrote: > > > > Hi Vijay, > > > > I’d advise you to create a new fixup function (c.f. gre44_fixup) that > deals with the extra headers you want. > > > > /neale > > > > > > *From: *vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Vijay > Kumar via lists.fd.io <vjkumar2003=gmail....@lists.fd.io> > *Date: *Tuesday, 25 May 2021 at 14:07 > *To: *vpp-dev <vpp-dev@lists.fd.io> > *Subject: *[vpp-dev] Regarding vnet/gre > > Hi, > > > > I have a requirement to add extension fields (like QFI, RQI) into the GRE > packet header leaving the VPP. > > Upon analyzing the packet trace, I found that gre4_input graph node is > called whenever GRE packets enter VPP but for outgoing packets, the GRE > header is added by the tunnel's mid-chain adjacencies. There is no GRE > graph node specifically for adding outgoing GRE header. > > > > Is it a good idea to add code changes in the adj-midchain-tx node for > adding new fields related to outgoing GRE packets? > > > > > > Pls advise. > > > > > > Thanks. > > Vijay. > >
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