Dear vpp-dev, I'm trying to do some IPv6 in IPv6 encapsulation with no tunnel configuration.
The objective is to encapsulate the received packet in an other IPv6 packet that will also "contain" a Hop-by-hop extension header. In summary, the structure of the final packet will look like this : Outer-IP6-Header -> Hop-by-hop-extension-header -> Original packet. The main concern here is that the size of the outer IP6 header + the size of the extension header > 128 bytes sometimes. When it arrives, I cannot write my data inside the buffer pre-data area because it has a size of 128 bytes. I already asked for solutions previously and I was adviced to either increase the size of the pre-data area by recompiling VPP or create a new buffer for my data and then chain it to the original one. I was able to create a buffer chain that seemed to work perfectly fine. However, when I tried to perform some performance tests I was quite disappointed by the results : the buffer allocation for each packet is not efficient at all. My question is then : Is there any way to increase the performances ? To allocate buffers, I use the function " vlib_buffer_alloc " defined in " buffer_funcs.h " but is it the right function to use ? In my case, the best option would be to have more space available in the buffer's pre-data area but VPP does not seem to be built in a way that allows easy modifications of the " PRE_DATA_SIZE" value. Am I right or is there any "clean" method to change this value ? Thank you all already for your help, Jérôme
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