I'm trying to do a simple ib_send_bw test between two VMs that each have a network namespace. Unfortunately, it seems like the netns layer is dropping the RoCEv2 traffic. The test works fine if I don't use ip netns. TCP also works perfectly. I verified this using tcpdump on the bridge between the two test VMs. I have tried both mlx4_ib and rdma_rxe and they both fail, though with slightly different error messages. I'm using Alma 9 and the elrepo ml kernel for my tests (6.2.10 currently) It looks like rdma cm connections should work since rdma is in universal mode: # rdma system netns shared copy-on-fork on # rdma link link rxe_eth0/1 state ACTIVE physical_state LINK_UP netdev eth0 I tried the non-SMC suggestions in this thread but with no luck yet: https://lore.kernel.org/netdev/20211228130611.19124-2-tonylu@xxxxxxxxxxxxxxxxx/T/ What should I try next? Thanks, Mark
