Hello! I have the eBPF/XDP based balancing router, it looks like facebook katran, but a little bit smarter, we use random based balancing algorithm, so also we have to learn how to sync connections between nodes. But, the main problem for us it's fragmented IP packets. Some times ago I tried to use for such packets AF_XDP, fast pass them into the user space, accumulate and after that pass back to the network, it was a PoC. So, I wonder, is some chance that IP de-fragmentation functions will be added into XDP? Also, I have a strange idea, I could store such fragmented packets in the LRU map, the original fragmented IP packet I could drop. When all the fragments stored, I could make the decision about the destination for balancing/routing. But now, here come problems, seems I could construct a big packet / jumbo frame, but it seems a little bit ugly. How could I emit all fragments from the map to the network after I've got the last fragment? -- Alexander Petrovsky
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