Hi, On Mon, Feb 04, 2019 at 11:50:30AM -0800, Peter Oskolkov wrote: > Hello! > > I'd like to change 6lowpan defragmentation > (net/ieee802154/6lowpan/reassembly.c) code to match that of regular > IPv6, as in https://www.spinics.net/lists/netdev/msg546133.html. > cool. I am curious, what is your exact testing plan for 6lowpan fragmentation? Or just cc me, then I will take a look. :-) > However, I don't have a physical Linux/6lowpan setup to test my > changes. Is it possible to create a virtual 6lowpan device/network > inside net namespaces to run tests like these: > > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/tree/tools/testing/selftests/net/ip_defrag.c > ? yes, on kernel since 4.19 you can setup a virtual phy network with the mac802154_hwsim driver, which works basic similar like the wireless mac80211_hwsim driver. Unfortunately you need iwpan to setup basic specific L2 configuration. It is part of wpan-tools [0]. When you load mac802154_hwsim it will register two phy's which can reach each other virtually. I guess it will be enough for your test setup. Sample setup: --- snip modprobe mac802154_hwsim iwpan dev wpan0 set pan_id 0xbeef ip link add link wpan0 name lowpan0 type lowpan ip link set wpan0 up ip link set lowpan0 up iwpan dev wpan1 set pan_id 0xbeef ip netns add foo iwpan phy1 set netns name foo ip netns exec foo ip link add link wpan1 name lowpan1 type lowpan ip netns exec foo ip link set wpan1 up ip netns exec foo ip link set lowpan1 up --- snap I hope this answers your question, let me know if I you have still questions. Thank you! - Alex [0] https://github.com/linux-wpan/wpan-tools
