— Damjan
> On 06.09.2021., at 15:27, Prashant Upadhyaya <praupadhy...@gmail.com> wrote: > > Hi, > > I am using VPP21.06 > In vlib_buffer_advance there is the following assert -- > ASSERT ((b->flags & VLIB_BUFFER_NEXT_PRESENT) == 0 || > b->current_length >= VLIB_BUFFER_MIN_CHAIN_SEG_SIZE); > > The above is problematic as I have a usecase where I construct a chained > packet. > The first packet in the chain is containing just an ip4/udp/gtp header > and the second packet in the chain is an IP4 packet of arbitrary > length -- you can see that I am trying to wrap the packet into gtp via > chaining. > As a result this assert hits and brings the house down. > My usecase works fine when I use the non-debug build of VPP. > > Perhaps this assert should be removed ? This assert enforces contract with the rest of the VPP code about minimal length of chaine buffer data. You can remove it, but be aware of consequences. At some point things may just blow up…. — Damjan
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