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<mailto: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<mailto:vpp-dev@lists.fd.io> <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>> on behalf of Vijay Kumar via lists.fd.io<http://lists.fd.io> <vjkumar2003=gmail....@lists.fd.io<mailto:gmail....@lists.fd.io>> Date: Tuesday, 25 May 2021 at 14:07 To: vpp-dev <vpp-dev@lists.fd.io<mailto: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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