Jérôme, Did you remember to enqueue the new head buffer’s buffer index to the next node instead of the original?
Cheers Ole > On 29 May 2021, at 13:31, jerome.bay...@student.uliege.be wrote: > > > Hello all, > > As I explained it in a previous thread, I'm trying to do some IPv6 in IPv6 > encapsulation. In addition to the outer IPv6 header that I'm adding for the > encapsulation, I'm also adding an Hop-by-hop extension header. > > Since the size of the outer IPv6 header + the HBH header can be quite large, > I need to use a new buffer to store the corresponding data. Then, I need to > create a buffer chain to link the original buffer and the new one. It is > relatively easy to add a buffer at the end of a chain : I've already done it > and it worked fine. However, here in my case, I need to add the new buffer at > the beginning of the chain because it carries the outer IPv6 header that > obviously needs to come on top of the existing packet. > > My issue is that I'm not able to prepend properly my new buffer to the chain. > Indeed, when I simply add the new buffer at the beginning of the chain > without changing any fields in the buffer's metadata but the minimum required > to make the chain (i.e next_buffer, total_length_not_including_first_buffer, > etc.), the next VPP nodes seem to ignore my buffer and directly use the next > one in the chain (i.e the original buffer in my case). I assume that I should > set some buffer's metadata accordingly but I don't know which one ? > > More generally speaking, what should be configured in a newly created buffer > when one wants to add it as the first buffer of a chain ? > > Thank you for your help, > > Jérôme > > >
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